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Different Packaging Methods for Lithium Batteries

There are two main packaging methods in the production of Lithium batteries: Rolling and Stacking. We will explore both methods in this article.

1. Rolling/Winding

Rolled cells are also known as winding cells or jelly rolls. Rolling was the first method introduced in producing Lithium batteries. This method has been used for a long time in the production of NiMH (Nickel-Metal Hydride) and LiPo (Lithium-ion Polymer) batteries. In this method, long layers of material are stacked and rolled.

This method allows for a high level of efficiency and consistency in the turnout of the product.

Some disadvantages include a low space utilization caused by the fixed cylindrical shape and temperature distribution caused by poor radial thermal conductivity. The number of cycles also cannot be too large; generally, one 1650 battery will have 20 cycles. Due to this, the capacity is small, and a large number of cells must be packed into the battery modules for electric vehicles.

Although the Cylindrical Rolling method appears simple, the internal design is anything but. Its complex design requires symmetry between the contact between the positive and negative electrodes, heat distribution, and the production machinery.

Let us explore two examples of batteries that are produced with this method:

The image above includes the internal dimensions in mm of a 18650 battery. The length of the electrodes between the cathode and anode nearly comes out to 1.5 meters when laid out while the width of the tabs comes out to only 4mm.

In order to reduce the uneven current and temperature distribution, engineers must carefully consider how they will arrange the tabs and electrode coatings.

The image above reflects warping, which occurs due to the inconsistent volume changes of the electrode layers. This is one of the reasons that cause the aging failure of batteries produced under a winding method.

The images below show the magnified electrode shapes of 18650 batteries under CT after storage, low-rate cycling, and high-rate cycling. Warping can be seen in the first image, labeled a). The second image, labeled b), shows how a pin is added in the middle to suppress the deformation of the core.

Although beneficial, the pins increase the weight of the battery and production costs.

2. Rectangular Stacking (Pouch Cells)

Pouch cells are created by stacking multiple electrode sheets on top of each other in what is known as the Stacking method.

There are many advantages to these pouch-shaped cells:

Due to the contact of the anode and cathode and its ratios allow for better heat dissipation.

The shape allows for higher efficiency and utilization in space, and they make modules and battery packs easy to form. Our batteries are more customizable, and we have ultra-thin batteries that can be around 0.4mm in thickness.

The distribution of current density is uniform as each electrode layer has a flange and tabs welded together.

There is one disadvantage to this method:

The pouch layer is so thin that the pouch itself is semi-conductive. This thus results in positive pouch corrosion when utilized inside devices. A simple solution to this is to wrap the cell in Kapton tape.

In summary, in order to compare the advantages and disadvantages of various types, we need to analyze from many angles such as thermal, mechanical, and reliability, not just the traditional electrochemical characteristics. That’s the packaging methods in the production of lithium batteries.

If you are interested in lithium battery, please don’t hesitate to contact us at any time! Grepow Website: https://www.grepow.com/

#Different Packaging Methods #lithium battery

Why does a Phone Battery Drain Faster in the Winter？

Temperatures around the US vary, but there are many areas where it is still cold and snowing. You may have noticed that when you use your mobile device outdoors on a cold day, the battery power may have dropped quickly; in some cases, the phone may have even turned off.

In this article, we will address whether the lithium battery in mobile devices consumes more power in lower temperatures, and we will explore low-temperature battery options.

An Experiment: A battery indoors

In order to come to an answer, let us explore an experiment where there are three mobile devices from different brands. These phones would be charged to 100% then unplugged and left with their screens on for two hours straight. All three phones would run the same programs to ensure similar power consumption, and the indoor temperature would remain at 21°C/69.8°F. After 20 minutes, we will most likely find the batteries of all the phones still at 100%.

An Experiment: A battery outdoors

Now, in a separate experiment, we would have three phones from different brands, and, similar to the previous experiment, these devices would be charged to 100% then unplugged and left on for two hours while running the same apps. However, this time, the phones would be taken outdoors near the snow where the temperature would be 3°C/37.4°F. After 20 minutes, we will likely see a different number representing the batteries’ status.

Just performing these two experiments would tell you that the batteries of mobile devices consume power at different speeds depending on the surrounding temperatures. After 20 minutes, the second experiment will show the batteries at around 97 or 95%.

Ordinary batteries at low temperatures

Most mobile devices for the general public use a Lithium-ion Polymer battery (LiPo battery). When the temperatures drop low in the winter, the chemical reactions of the electrolytes slow down and result in less current and a decrease in battery power.

In more extreme situations, the phone will automatically shut down. The decrease in power or auto shut down are both protective measures. The shut down itself differs by manufacturer: some phones will shut down at 0% while others will automatically shut down the temperatures drop too low.

Tips to use your phone in cold temperatures

When we are outdoors, there are some simple actions that you can take to prolong the use of a battery without having to charge it.

First, try not to expose your phone to low temperatures. Keep it in your pocket or in your bag where it can be enclosed away from the cold.

If a phone call comes in, use your earphones to answer it instead of bringing your phone out.

If your phone is turned off outside, wait until you warm up before restarting it when you’re back indoors. You want the battery to acclimatize to the temperatures indoors.

More simply, place a protective shell around the phone.

You can also choose to use a professional low-temperature battery that can be used normally even in low temperatures.

Grepow can actually help you with that. We have low-temperature LiPo batteries that can operate in a temperature range of -50°C/-58°F to 50°C/122°F. They can discharge at over 60% efficiency with 0.2C and -30°C/-22°F. When charged at 20°C/68°F to 30°C/86°F by 0.2C, the capacity can be maintained above 85% after 300 cycles. These batteries can be ready for mass production, and they have been widely used in cold climates and military products.

These low-temperature batteries are specially developed by Grepow in order to overcome the defects inherent in batteries when they are exposed to lower temperatures. Our low-temperature batteries are manufactured with an innovative concept design, advanced formulas, and rigorous manufacturing process and method.

Keep an eye out for Grepow’s official blog, where we regularly update industry-related articles to keep you up-to-date on the battery industry.

Grepow website: https://www.grepow.com/

Grepow Blog: https://blog.grepow.com/

#low temperature battery

Lithium Batteries as a Power Source for Wearable Products

A power source for wearable products must meet many requirements. Its charge and discharge circuit design must meet the technical specifications for manufacturability, EMC, EMI, and other certifications. The wearable battery must also require a certain level of cost advantage, quality, and technology. These many requirements make lithium batteries appealing as a power source, which is why they are widely used in wearable products.

A lithium-ion (Li-ion) polymer battery has a power supply voltage of about 3.7V. The lithium-containing oxide is used as the positive electrode, and the layered carbon is used to replace the metal lithium of the traditional lithium primary battery as the negative electrode.

There are so many advantages to using lithium batteries in wearable products. First, the output voltage ranges from 3V to 4.2V. Second, it has a wide operating temperature range of -20℃ to 60 ℃ and a charging temperature range of 0℃ to 50 ℃. Lithium batteries also have a long cycle life that can generally reach more than 500 cycles, even 1,000 cycles. Lithium Iron Phosphate batteries can reach more than 2,000 times. Other benefits include no memory effect, low self-discharge rate during storage, and full-charge Li-ion storage at room temperature. After 1 month, the self-discharge rate can come out to about 5-10%.

Lithium Polymer batteries also do not consist of substances harmful to the environment, and they can be made into various special shape batteries. Every shape is possible, such as the following: Rectangle battery● Ultra Thin Battery●Curved Battery●Round Lipo Battery●Triangle Battery●Hexagon Battery●Ultra Narrow Battery●C Shape Battery●D Shape Battery●Polygonal Battery

These shapes can range anywhere from round to curved, which helps in the development of the numerous consumer electronics out today.

These benefits are a stark contrast to the lithium batteries that were used in mobile phones a year ago since they needed to be charged and discharged three times.

However, nothing’s perfect, and Li-ion batteries are no exception. There can be some weaknesses, such as poor compatibility with ordinary batteries; inconvenient replacement with ordinary, dry batteries; and swelling after repeated charging and discharging. The structural design must also reserve a certain amount of expansion space for the battery. There must be special protection circuits to prevent overcharge, over-discharge, and overcurrent as well.

There are further benefits to using lithium batteries as a power source:

In addition to adding protection circuits to prevent overcharge, over-discharge, and overload, Lithium polymer batteries have vent holes, which help in avoiding the destruction of cells. These vent holes are thin holes on the surface of the battery case. When a cell short circuits, a large amount of gas generates inside a battery in a short period of time. With the pressure rapidly increasing, there is a threat of explosion, but the vent holes prevent the internal pressure of a battery from rising too high, thus circumventing an explosion.

Furthermore, the separator inside a Lithium Polymer battery has high puncture resistance and prevents internal short circuits. On top of that, the separator will melt when the internal temperature of a battery rises too high, and it will prevent an explosion. When the internal temperature of a battery reaches above 130℃, the mesh pores of the separator will be closed to prevent the passage of Lithium ions and increase the internal resistance to 2kΩ, thereby protecting the battery. Once the air vent and diaphragm are activated, the battery will be permanently disabled.

A general Lithium battery’s circuit board will protect the battery from overcharge, over-discharge, and overload. Several key pins, such as the DO, CO, and VM, generate different levels in different situations. They control whether the N-channel MOS transistor is turned on or not, and they generate appropriate changes so that the battery is protected. There are also Lithium battery chips that form an integrated IC.

It is for these many reasons that Lithium batteries are commonly used in wearable products.

Learn more about batteries

Keep an eye out on Grepow’s official blog, where we regularly update industry-related articles to keep you up-to-date on the battery industry.

Grepow website: https://www.grepow.com/

#Lithium Batteries

What are the Applications of GPS Tracker?

When it comes to GPS, everyone must be very familiar with it, but when it comes to GPS trackers, they will feel a little strange. Many people will think that I have mobile phone positioning is enough, GPS trackers are not useful. In fact, this is also because many people do not understand the GPS tracker device, so there is a certain limitation in the understanding of these aspects, so it is not practical to feel the use of the GPS tracker. Let ’s analyze with many people in which areas the GPS tracker can play a role and what are its uses?

1. Vehicle Leasing

Leased cars and car mortgage loans collectively refer to the field of vehicle leasing. So does the car GPS tracker cost electricity? A car GPS tracker is divided into two types: built-in battery and wiring. Among them, the connected GPS tracker can locate in real-time, grasp the vehicle position at any time, and view historical trajectories, issue various driving reports, etc., and are obtained in many industries such as business car management, private car anti-theft, loan car tracking, etc. It has been widely used. The battery level of the car GPS tracker depends on the power consumption and function of the tracker. Generally speaking, it will not affect the life of the car battery, and the owner can use it with confidence.

2. Logistics

Logistics transportation not only refers to the field of express transportation but also covers cold chain transportation of fresh vegetables and fruits, cargo transportation and catering industry transportation, takeaway and so on. The logistics and transportation field requires high timeliness and fast delivery, but sometimes the superior and the customer cannot grasp the actual transportation status of the car. With the GPS tracker, the superior and the customer can immediately query the actual transportation status of the goods on the GPS platform and predict the Arrival time of the goods.

3. Kids safety

The student wears an electronic student ID with GPS tracker function, which can deal with many problems such as difficulty in attending school, attendance at school, emergency out of control, etc., and protect the safety of the child in all aspects. Not only can you grasp your child’s arrival and departure status in real-time, but also know the child’s arrival and departure information. When students enter dangerous areas, such as dams, black Internet cafes, construction sites, etc., they must immediately give an early warning so that parents can take immediate safety precautions.

4. Animal management

Animal management includes livestock such as cattle, sheep, horses, and pets such as cats and dogs. Let’s talk about animal husbandry first. Animal husbandry data can be collected based on GPS trackers. Herders can perform grazing management, positioning monitoring, and health status inquiry at any time and place according to the APP. Managers can avoid inbreeding according to the traceability system, which is conducive to eugenics and superior breeding, complete pasture supervision, and deal with grassland decline caused by overgrazing. Besides pets, there are more and more people who keep pets such as cats and dogs. It is inevitable that pets will be lost due to negligence, and pet GPS trackers can prevent risks well.

The above is the application of GPS tracker shared with you, there are other people who have not mentioned can share with us here. If you want to have a high quality and long life GPS battery, please contact us at [email protected].

#gps battery #gps

What are the Different Shapes of the Battery？

There are many devices that use batteries in our daily life, so what shapes do you know?Batteries, of course, that’s rechargeable lithium-ion batteries and as we all know, lead-acid batteries (usually standard size) are usually standard size, but lithium-ion batteries can come in a variety of packages and shape battery.

Custom Shape Battery

One of the most common misconceptions is that polymer batteries are different.In fact, they are one of the most common types of lithium-ion batteries, assembled and packaged in flat, bag-like shapes.Their core design is based on standard lithium ion chemistry. They are called “polymer” batteries because they tend to use gel-like rather than liquid-like electrolytes. The outer packing is thin foil that holds the inner structure together.As a result, they can be easily damaged or punctured, and are often (if not always embedded in mobile devices) protected mechanically.

One of the advantages of polymer batteries is that they can be manufactured in almost any custom size or shape.This ability to make batteries suitable for mobile devices, not vice versa, makes polymer batteries extremely attractive.Polymer batteries can also be made very thin.This photo shows a polymer battery made by GREPOW for smart CARDS.It’s only about 0.4 millimeters thick.The drawback of polymer batteries is the lack of standardization, which makes them expensive.Each battery model must be designed and shaped to a specific size for a mobile device manufacturer.Polymer batteries cost nearly twice as much (for the same amount of stored energy) as comparable standard 18650 batteries.

18650 Battery

The naming of the 18650 battery is hardly creative.It was a standard cylinder 18mm in diameter and 65mm in height, hence the name.Over the past decade, the standard size of these batteries has made them ubiquitous and cheap.They are widely used in laptops, but they have proved less practical for thin smartphones.Tesla motors took advantage of mass production and the low cost of the 18650 to use in electric vehicles.The Tesla Model S’s battery pack contains nearly 7,000 such cells.Panasonic’s 18650 battery has a capacity of 3,400 mAh.It’s similar to the ones used in tesla cars.Other major makers of electric cars have opted for large-size polymer batteries. Still, there are 18650.

Prismatic Shape Battery

The third type of battery is called prismatic.They are very similar in nature to polymer batteries, but are packaged in solid casings or tanks usually made of aluminium alloy.This provides additional mechanical protection and necessary safety.Mobile devices that offer replaceable batteries use square batteries.Prismatic cells tend to be thicker than polymer cells because of the walls of the external tank.

Keen readers may ask questions about the connector to the SONY polymer battery.In fact, it’s an electrical connector made from thin, flexible cables.At the tip of this cable, you can observe some of the circuits that provide the necessary electronic protection for the battery.In particular, the circuit ensures that the battery is not subjected to excessive voltages or currents.If the battery is exposed to adverse conditions, the built-in fuse disconnects the battery.Similar circuits are embedded inside prismatic cells.However, the 18650 battery is bare, that is, it does not include any such protection circuit, which must be included in the external battery management system before the battery can be used.

Above is the battery knowledge that GREPOW shares with you. If you are interested in SHAPE BATTERY, want to learn more about different shapes battery information, please contact the Grepow office at [email protected]. More information can be found at https://www.grepow.com/

#shape battery

What is Customized Battery?

Perhaps someone has these misconceptions, customization just tailor design the compact size, and relatively higher cost. However, the existing battery product has more limitation, it is suitable for individual consumers and much enough to fulfill their needs. For industrial application, there are circumstances where a battery pack has to function in a very specific manner, conform to particular measurements or fulfill other highly precise requirements. In such instances a custom designed and built battery pack is often necessary.

So in this article, we discuss the advantages of customized battery with case study, something you need to notice, and how it creates value to your company.

The Four Advantages of Customized Battery:Compact Size

Similar to most portable electronic devices, the battery of wearable devices are complicated, some specific requirements to the shape, size, durability, discharge rate, and other functions.

Of course, we (consumer) all wanted much light, handy, and durable electronic devices. Different types of battery and technology can reach more requirements for wearable devices.

Moreover, currently the most popular among wearable devices are lithium ion (Li-ion) and lithium ion polymer (LiPo, Li-Po, LIP, Li-poly) batteries, the small lithium ion polymer batteries or LiCoin rechargeable batteries are mostly used.

Wearable devices like wristband, smartwatches, smart ring, etc., which we often encounter every day, can customize the shape of the battery in order to optimize the space, size, and weight of the product. Curved Lipo battery in a Shaped Battery series.

The curved strip battery can be installed in a ring-shaped band, and it has some features of large capacity and low self-discharge, which enables it to maintain a longer performing time and solve the capacity problem of the wearable device.

In addition to the Curved Shape battery, the shapes currently developed are:

Rectangle battery

round battery

ultra thin battery

curved battery

triangle battery

hexagon battery

ultra narrow battery

C shape battery

D shape battery

polygonal battery.

DON’T LET BATTERY DESTROY YOUR PRODUCT DESIGN

As we know, there are many smart glasses (like VR glasses) on the market, and various functions. In order to detect the user’s physical condition, such as the step counter, heart rate calculator and analysis of sleep quality, etc., most of these devices are equipped with different types of sensors, including accelerometers and gyroscopes. In order to allow users to see virtual images through the glasses, they install the image projected devices on the glasses, which also requires lots of electricity to support.

Secondly, in order to meet the design and its functions, the battery should also be designed in different shapes to fill in the space of product. Therefore, for battery manufacturers, customize the shape and size of the battery depends on their specific needs, and the precision of sculptures is continuously improved. Therefore, breaking through the boundaries of existing products may not be impossible.

Targeted Customization by needs

We have received a request from a customer to tailor-made the battery for medical used. Due to the special functions and environmental condition of their products, we provide the customization solution to them.

Why they need customization solution, because the battery required conduct discharge high current in a short period in a low-temperature environment, the cold outdoor environment near -30 to 40°C. Also, the battery must allow continuously output at 12V at -40°C, achieved a few seconds of 2.5A discharge with the protection of battery management system (BMS). The special requirement like that is cannot be met by existing battery products, so we need to work with engineers to tailor design this battery for them.

As we know, the battery performs in low-temperature will affect the discharge current and capacity, only a few kinds of batteries can be used in an extremely cold environment. Currently, most of the low-temperature battery products on the market can only be charged and discharged at about -20°C. Therefore, existing battery product’s specifications may not be able to conform to their products, and their sizes are also needed customize, thus companies need to find battery company that have the ability to produce the low temperature and high discharge cells for them.

Battery Cycling test at 0.2c charging and discharging at -20℃

Battery test discharging at different temperature

In addition to temperature, what others can be customized? There are 6 features below:

Voltage

Capacity

Dimensions

Charge Current

Discharge Current

Usage Temperature

Keep secret

In terms of customized services, the customer’s requirements are related to their unique product design. Whatever the specifications, size and application areas of the battery, it is a business secret of customers. Therefore, most of its information will be strictly confidential and will not be disclosed until it is approved by the customer.

Reduce Cost

In this session, we divided as “Short-Term Cost” and “Lifetime Cost” these two parts.

At first, you might think that the price of a custom battery is higher, but it’s not entirely correct. There is various 3C product in the market, which have their own patent and design. Thus, the matching battery must be perfectly matched with the product. If there is a difference in shape or size, the company may have to adjust the design of the product to cater to the battery, thus modify or even redesign the product. In this way, the customized battery not only makes the product more versatile, but also increases the efficiency of launching new products and reduces the overall cost.

In addition to the purchase cost, there are some additional costs before and after the sale, such as battery design, R&D, after-sales transportation costs, technical support, and maintenance warranty, etc., are included in the considerations. Let say an international battery company, will cooperate with SME and local re-seller all over the world, which can closer to customer and provide support, so directly deliver batteries to customers is easier. It can be seen that the customization solution can reduce unnecessary costs from products and services, can concentrate resources on more competitive and valuable works.

If the purchased battery will be used for a long time, in terms of long-term cost, the life span of the battery, using cycle, the safety of storage, and the maintenance cost in the future should be considered in comparison with the cost of purchase.

Perhaps most of you have used or using lead-acid (LA) batteries. Lead-acid battery are mostly used in the field of energy storage due to its following features:

Low price

Raw materials are easy to explore

Stable performance

Easy to recycle

Suitable for high current discharge

The lower cost of materials thus the lower purchase cost, but its performance and life span are far less than LiFePO4. At the same size comparison, the LiFePO4 battery has more capacity, longer life span, either of high temperature and low temperature resistance, safety and environmental friendly. Despite the higher upfront cost of LiFePO4 battery, but free of the maintenance cost, and cost of replacement. Let say we compare the total cost of ownership LiFePO4 battery, to three equivalent size off-the-shelf lead-acid battery technologies, in the long run, the average cycling cost of lithium iron phosphate battery is lower. And these savings make it more valuable than lead-acid batteries, making them more suitable for long-term investments.

Precautions of customization

Custom batteries are not suitable for everyone. As mentioned before, it may be better for individual consumers to purchase existing battery products directly, so there are some parts to be aware of before choosing a customized battery solution.

Which chemistry is more suitable for your product?

Not each chemistry provides the same performance in every application, and it’s important to determine which chemistry is best for your needs. As I mentioned before, Lead Acid (LA)Battery is economical but there are many complex long-term costs like the cost of replacement and maintenance.

As a result, battery companies have a significant role in this situation, providing specific battery solution for customized voltage or capacity you may need, and providing the right chemicals for your application.

Communication with the synergy effect

When you decide to customize the battery, the information provided is not comprehensive enough, it will not only affect the efficiency, but also the performance of the end product.

If customer requests, the customized battery can also be packaged. Most of the packaged batteries will be equipped with protective plates, wires, plug wires, housings, etc., and perhaps need to install FPC soft cable, some needs plastic shells, such as RC Car’s battery,and may need to add communication protocols, such as car batteries. Therefore, these product use polymer lithium batteries involving high current, shell and different color, etc.. Detailed expression of requirements and parameter requirements can reduce many unnecessary errors.

Does the company have a relative qualification for some specific application?

IATF16949

If you are work in the automotive industry, you might already know with this qualification. This is a special agency established in 1996 by the world’s leading automobile manufacturers and associations to coordinate the international automotive quality system specifications. The full name is the International Automotive Task Force (IATF), and the IATF 16949 technical standard. It is an international standard applied in the automotive industry to further standardize the requirements of the quality management system of various organizations in the automotive industry.

There are also some international certifications in the industry that are required for the internationalization of battery companies and for the production of high quality batteries.

ISO13845

ISO 13485 is the only globally recognized quality standard for medical devices, including the design, production, operation, monitoring, transportation, installation, and after-sales service of medical equipment. The terms of ISO 13485 are similar to the US FDA medical equipment management system CFR Part 820. In addition to improving the company’s medical equipment and process requirements, it is also a shortcut and entry condition for the company’s products to enter the international market.

The ISO13485 standard is developed to complement the ISO 9001 standard and covers the quality management and assurance systems of manufacturers and suppliers of medical products.

UL (UNDERWRITER LABORATORY)

This is a US safety certification. If you want to enter the US market, you will have to obtain this qualification to test the safety of the battery products. The detailed test content can be seen here.

CE (COMMUNATE EUROPIEA)

Indicates that the product meets the requirements of a series of European directives such as safety, hygiene, environmental protection and consumer protection. Confirm that the product has passed the corresponding conformity assessment procedure or the manufacturer’s declaration of conformity, which is the “passport” for the product to be allowed to enter the EU market.

UN38.3

This can be said to be the basic in the battery qualification certification, which is to ensure that the battery products through the high simulation, high and low temperature cycle, vibration test, impact test, 55°C external short circuit, impact test, overcharge test, forced discharge test, to ensure lithium Battery transportation is safe. If this test report is not available, civil aviation will ban lithium batteries for air transportation.

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This article is written by Grepow. If you want to learn more about battery, and customized battery, please visit our official website or blog to read more articles, or directly communicated with our specialists.

Custom Medical Battery Solutions for Top Medical Device Companies

10 precautions for lithium polymer battery customization

#Customized Battery

The Characteristics of Low-temperature Lithium Batteries

Since entering the market, lithium batteries have been widely used for their long life and large capacity with no memory. With the expansion of batteries in various applications and fields, many problems have risen: reduced capacity, severe voltage attenuation, fast life-cycle degradation, and lithium plating just to name a few.

For instance, the operating temperature of traditional lithium-ion batteries is between -20°C to 55° C. In aerospace, automotive, and military fields, these batteries must operate normally at -40° C. This becomes an issue when the discharge capacity of low-temperature lithium-ion batteries is only about 31.5% at room temperature.

It is thus of great importance that we improve the low-temperature properties of low-temperature lithium batteries.

1. Factors that limit the performance of low-temperature, lithium-ion batteries

There are several factors that restrict the performance of lithium-ion batteries in low-temperature environments.

The viscosity of the electrolytes in a battery increase in response to low temperatures and the electrolytes can even solidify.

The compatibility between the electrolytes, negative electrodes and the separator also deteriorates.

Severe precipitation occurs at the negative electrode of a lithium-ion battery. The precipitated lithium reacts with the electrolytes, and the deposition ultimately causes the SEI (Solid Electrolyte Interface) to increase in thickness.

The diffusion system of a lithium-ion battery inside the active material decreases, and the Rct (Charge Transfer Resistance) increases significantly.

All these factors serve to severely lower the performance of low-temperature, lithium-ion batteries.

2. The decisive factors that affect the low-temperature performance

(1)ELECTROLYTES

The electrolyte has the greatest impact on the low-temperature performance of lithium-ion batteries. This is in large part due to the effect of the composition and physical and chemical properties of the electrolyte.

As stated earlier, cycling a battery at low temperatures will cause the viscosity of the electrolytes in a battery to increase. In addition, the ion conduction speed will slow down, which ultimately causes the mismatch of the electromigration speed of the external circuit. This results in the polarization of the battery and the charge and the sharp decrease in capacity. The problem is further compounded when dendrites form on the surface of a negative electrode (this occurs easily when charging at low temperatures), which results in battery failure.

The low-temperature performance of electrolytes is closely related to the conductivity of electrolytes. An electrolyte with high conductivity can transfer ions quickly and can exhibit more capacity at low temperatures. The more the lithium salt dissociates in an electrolyte, the more the number of migrations and the higher the electrical conductivity. With a higher conductivity comes a faster ion conduction rate, smaller polarization, and better battery performance at low temperatures. Therefore, higher electrical conductivity is a necessary condition for achieving a high-performing, low-temperature lithium-ion battery.

One of the ways to improve the conductivity of an electrolyte is to reduce the viscosity of the solvent. The conductivity of the electrolyte is related to the composition of the electrolyte, and reducing the viscosity of the solvent is one of the ways to improve the conductivity of the electrolyte. The good fluidity of the solvent at low temperature is the guarantee of ion transport, and the solid electrolyte membrane formed by the electrolyte at the negative electrode at low temperature is also the key to affect lithium-ion conduction. RSEI (Resistant Solid Electrolyte Interface) is the main impedance of lithium-ion batteries in low-temperature environments.

(2) LI + DIFFUSION RESISTANCE

The other main factor limiting the low-temperature performance of lithium-ion batteries is the sharply increased Li + diffusion resistance at low temperatures, not the SEI film.

3. Low-temperature characteristics of different materials in lithium-ion batteries

LOW-TEMPERATURE CHARACTERISTICS OF LAYERED CATHODE MATERIALS

The layered structure of cathode materials has the unparalleled performance rate of a one-dimensional lithium-ion diffusion channel and the structural stability of a three-dimensional channel. It is the earliest commercially available lithium-ion battery cathode material. Its representative substances are LiCoO2, Li (Co1-xNix) O2, Li (Ni, Co, Mn) O2 and so on.

Experts took LiCoO2 / MCMB as the research object and tested its low-temperature charge and discharge characteristics.

The results show that as the temperature decreases, the discharge platform decreases from 3.762V (0 ° C) to 3.207V (-30 ° C); the total battery capacity also sharply decreases from 78.98mA · h (0 ° C) to 68.55mA · h (–30 ° C).

LOW-TEMPERATURE CHARACTERISTICS OF SPINEL ANODE MATERIALS

The spinel structure LiMn2O4 cathode material has the advantages of low cost and no toxicity because it does not contain any Cobalt.

However, the variability of the valency of Manganese and the Jahn-Teller effect of Mn3 + lead to issues with structural instability and poor reversibility of this component.

Different preparation methods have a greater impact on the electrochemical performance of LiMn2O4 cathode materials. Take the Act as an example: the Act of LiMn2O4 synthesized by the high-temperature solid-phase method is significantly higher than that of the Sol-Gel method. This phenomenon also has a lithium-ion diffusion coefficient mainly due to the different synthetic methods that have a greater impact on the crystallinity and morphology of the product.

LOW-TEMPERATURE CHARACTERISTICS OF PHOSPHATE ANODE MATERIALS

LiFePO4 has become the main body of the positive electrode material of batteries due to its excellent safety and stability in volume. However, the performance is not ideal due to its material as an insulator, low electronic conductivity, poor lithium-ion diffusivity, and poor conductivity at low temperatures. All these issues increase the internal resistance of the battery, which greatly affects the polarization and blocks the charge and discharge of the battery.

When studying the charge and discharge behavior of a LiFePO4 battery at low temperatures, it was found that its Coulomb efficiency decreased from 100% at 55 ° C to 96% at 0 ° C and 64% at –20 ° C. The discharge voltage decreased from 3.11V at 55 ° C to -20V at 2.62V.

In other studies, nano-carbon was used to modify a LiFePO4 battery, and it was discovered that the addition of the nano-carbon as a conductive agent reduced the sensitivity of LiFePO4’s electrochemical performance, as well as low-temperature performance. The discharge voltage of a modified LiFePO4 battery from 3.40V at 25 ° C dropped to 3.09V at –25 ° C, which is a decrease of only 9.12%. Its battery efficiency at –25 ° C came to 57.3%, which was higher than the 53.4% efficiency of a battery without nano-carbon as a conductive agent.

LiMnPO4 has also recently drawn great interest. A study found that LiMnPO4 has the advantages of high potential (4.1V), no pollution, low price, and large specific capacity (170mAh / g). However, because LiMnPO4 has a lower ionic conductivity than LiFePO4, Iron is often used in practice to partially replace Manganese to form a LiMn0.8Fe0.2PO4 solid solution.

4. Low-temperature characteristics of lithium-ion battery anode materials

For the following reasons, the low-temperature deterioration of the negative electrode material of a lithium-ion battery must be taken more seriously than that of one with the positive electrode material:

When charging and discharging at a low temperature and large rate, a battery undergoes severe polarization, a large deposit of lithium on the surface of the anode, and a lack of conductivity with the reaction product of lithium and the electrolyte.

From the perspective of thermodynamics, the electrolyte contains a large number of polar groups such as C–O, C–N, etc., which can react with the negative electrode material, and the SEI film formed is more susceptible to low temperatures.

Carbon anodes are difficult to insert lithium at low temperatures, and there is the asymmetry in the charge and discharge.

5. Research on Low-Temperature Electrolytes

The electrolyte has the role of transferring Lithium in the lithium-ion battery, and its ionic conductivity and SEI film-forming performance have a significant effect on the low-temperature performance of the battery.

There are three main indicators for judging the pros and cons of low-temperature electrolytes: the ionic conductivity, electrochemical window, and electrode reactivity.

The level of these three indicators depends largely on their constituent materials: solvents, electrolytes (lithium salts), and additives.

Compared to the chain carbonate, the low-temperature characteristics of the EC-based electrolyte have a tighter cyclic carbonate structure, a larger force, and a higher melting point and viscosity. However, the large polarity brought by the ring structure tends to have a large dielectric constant. EC solvents have a large dielectric constant, high ionic conductivity, and excellent film-forming properties, which effectively prevent the co-insertion of solvent molecules, making them indispensable. Therefore, most common low-temperature electrolyte systems are based on EC and the mixed Low melting point small molecule solvent.

The lithium salt is an important component of the electrolyte. Lithium salts in the electrolyte not only improve the ionic conductivity of the solution but also reduce the diffusion distance of Li + in the solution. In general, the greater the Li + concentration in the solution, the greater its ionic conductivity. However, the concentration of lithium ions in the electrolyte and the concentration of lithium salts are not linearly related but are parabolic. This is because the lithium-ion concentration in the solvent depends on the dissociation of the lithium salt in the solvent and the strength of the association.

6. Process factors

In addition to the battery composition itself, the process factors in the operation of a battery have a great impact on battery performance.

(1) PREPARATION PROCESS

Experts studied the effect of electrode load and coating thickness on the low-temperature performance of LiNi0.6Co0.2Mn0.2O2 / Graphite batteries and found that, in terms of capacity retention, the smaller the electrode load, the thinner the coating layer and the better its low-temperature performance.

(2) CHARGE AND DISCHARGE STATUS

Experts have studied the impact of low-temperature charge-discharge conditions on battery cycle-life and found that larger discharge depths will cause greater capacity loss and reduce cycle life.

(3) OTHER FACTORS

There are a multitude of other factors that affect the low-temperature performance of lithium-ion batteries: the surface area, pore diameter, electrode density, separator, and wettability of the electrode and electrolyte. The impact of material and process defects on the low-temperature performance of a battery cannot be ignored as well.

7. Assurance of low-temperature performance of lithium batteries

To ensure the low-temperature performance of lithium-ion batteries, the following points need to be achieved:

(1) SEI FILM

The formation of a thin and dense SEI film.

(2) THE ACTIVE MATERIAL

A large diffusion coefficient of the Li + in the active material.

(3) IONIC CONDUCTIVITY

High ionic conductivity of the electrolyte at low temperatures.

Research on low-temperature batteries has also begun into another type of lithium-ion battery: The all-solid-state battery. Compared to a conventional lithium-ion battery, all-solid-state batteries, especially those with thin-film, are expected to completely solve the issue of capacity degradation and the cycle safety of batteries used at low temperatures.

If you are interested in low-temperature lithium batteries, please contact the Grepow office at [email protected]. More information can be found at https://www.grepow.com/

#Low Temperature Lithium Battery #low temperature battery #lithium battery

Micro Batteries Can be Recharged Quickly Without Exploding

With future innovations in micro battery technology,people may no longer need to worry about losing power to smart devices.

Today's smartphones have limited battery power and are often just enough for a day at work.It takes several hours to charge the phone when the battery is low,and the lithium battery in your hand may even explode when charging or talking for a long time.

However,with the continuous breakthrough of 3D micro battery technology research and development,the above problems may be solved in the future.

The Nanjing University of Science and Technology Gelate Nanotechnology Research Institute has made China's latest breakthrough in the preparation of three-dimensional nano-electrodes,and China's super micro battery research and development has its own technical reserves.

According to GREPOW,the research results paper has been published in the Nature series magazine"NPG Asia Materials".

Three-dimensional microbatteries are new thin-film microbatteries with three-dimensional nanostructures.Compared with ordinary lithium batteries,the two are structurally the same,both are composed of positive and negative electrodes and electrolyte,the biggest difference is in the material.

Different from ordinary lithium-ion batteries,micro batteries are deposited in the form of thin films.The thickness of the entire battery is only 10-20 microns.It can be designed into any shape and size and integrated in the IC card circuit.Thousands of times.

Because of the use of solid electrolytes,the three-dimensional thin-film microbattery completely avoids the risk of explosion of traditional lithium-ion batteries.At the same time,the battery operating temperature was increased from the existing 50°C to more than 100°C.

Compared with electronic components,which are getting smaller and smaller due to technological advancement,the current battery technology has not kept up with this race,and three-dimensional nano-micro batteries will change all this.

From GREPOW's point of view,people still have to choose between power and power when using batteries.For example,the battery used in mobile phones has a large capacity,low power density,and slow charge and discharge speed.Supercapacitors have large power density but small capacity.,Low energy density,fast charge and discharge speed.

How to combine high energy density and high power density has always been a difficult problem for the battery industry.The GREPOW battery takes into account the above-mentioned dilemma,that is,while the specific energy density per unit area increases,it can also achieve rapid charge and discharge.

It is understood that since the 1990s,the research and development of thin-film microbatteries in European and American countries has achieved staged results,and the GEPOW thin battery can achieve a thickness of 0.4mm,which is smaller than your nail cover.Now it has achieved small-scale mass production,and has broad application prospects in super smart cards(such as visual bank cards),electronic tags,microelectromechanical systems(MEMS),implantable medical devices,miniature sensors,and miniature defense technology equipment.

In addition,Grepow has developed a super micro battery,which has 100 times the power of ordinary lithium batteries.Civil research and development have been completed.Theoretically,a credit card thickness mobile phone will take less than a few minutes to charge in the future.With the future innovation of microbattery technology,people may no longer need to worry about running out of mobile phones,because fast charging will become a reality.

#micro batteries

How to Charge a Bluetooth Headset Correctly?

I believe that many driver friends have such troubles, it is not convenient to answer the phone when driving. The advent of Bluetooth headsets solves this problem very well. Let’s get rid of the annoying wires and talk freely and easily in various ways. Then we need a Bluetooth headset battery with enough life.

So how does a Bluetooth headset charge? Can you overcharge a blue headset? Speaking of this problem, a friend may be thinking, is it not easy to charge a Bluetooth headset? Just plug it in and turn on the power. In fact, Bluetooth headset charging is still very tricky, the correct charging method can maintain the life of Bluetooth. Next, I will introduce the Bluetooth headset charging method for everyone.

How to charge Bluetooth headset？

1. Use a suitable charger

Generally, Bluetooth headsets have dedicated chargers. If you do n’t have a dedicated charger, you can find the same charging interface (some with a small mouth and a round hole, and some with the MiniUSB universal interface) and the same charger with the same rated output power.

2. Insert all the plugs when charging

It doesn’t just insert more than half, it will damage the machine for a long time. When plugging and unplugging the charging plug, it should be lighter, otherwise, the plug will become loose for a long time.

3. Charge on the base or charging box

If the Bluetooth headset is plugged into the base or charging box for charging, it will take longer to charge than charging the Bluetooth headset directly. The charging method is the same as charging the headset directly. Just plug the charging cable into the hole of the base.

4. Charge your Bluetooth headset

When charging, the red indicator light is on, indicating that charging is in progress. If charging is complete, the indicator light will turn blue, and you can remove the charger at this time.

5. Don’t use the headset when charging

When charging the Bluetooth headset, try not to use the headset again to avoid accidental damage.

How long does the Bluetooth headset charge？

The Bluetooth headset battery is not fully charged when it leaves the factory. In order to fully activate the battery, the first three charges are 6-8 hours. You can charge it for 2-3 hours each time. When charging, it is usually a red indicator light. When the light is off, it indicates that the battery is fully charged.

To achieve the longest battery life of a Bluetooth headset, you must master the correct method of charging the Bluetooth headset, that is, only when the Bluetooth headset battery is low. Generally, the number of charging times of a Bluetooth headset battery is about 500 times. That is, the normal service life is about 2 years. The normal standby time is 2-4 days when fully charged. Normal use is 1-3 days when there is a phone. Many phones will be relatively short.

How to maintain Bluetooth headset life？

Charging time of a single-ear Bluetooth headset

The charging time of a single-ear Bluetooth headset is generally not more than 3 hours. This is the best charging time. It is also best not to exceed 4 hours for a two-ear Bluetooth headset. Everyone also knows that the lithium battery inside the Bluetooth headset is small in size, and the charging time is not useful. Unlike our mobile phone battery, it can extend the charging time. A better and more accurate explanation should be said, as long as the charging indicator of the Bluetooth headset does not blink, when the charging is full, then we do not need to charge it again, just unplug the power.

Bluetooth headset battery life

The Bluetooth headset is also an electronic product. The built-in battery has a battery life. Generally, the number of charging cycles of the Bluetooth headset battery is 300 ~ 500. The more charging times, the smaller the battery’s ability to continue. Characteristics, so the battery life will be getting worse and worse, and some low-end Bluetooth headsets use very poor batteries, the actual number of cycles less than 100 times will be broken.

The above introduces the charging method of Bluetooth headset, I hope it will be helpful to everyone. If you want to know more about the Bluetooth headset battery knowledge, please continue to pay attention to the GREPOW website. More exciting content will be presented to everyone later.

If you are interested in Bluetooth headset battery, please don’t hesitate to contact us at any time! Email: [email protected] Grepow Website: https://www.grepow.com/

#Bluetooth headset battery

Lithium Battery Customization Tips You Should Know

How to customize the lithium battery pack, what should be paid attention to when customizing the lithium battery? Lithium battery packs are becoming more and more refined in different fields, such as consumer lithium batteries, industrial lithium batteries, communication lithium batteries, power lithium batteries, and energy storage lithium batteries. The needs of the product are different, so the performance of the corresponding lithium battery will also be very different. What are the precautions for the need for a custom lithium battery pack?

Custom lithium battery pack time cycle

We can provide a quick sample service. The entire cycle of custom lithium battery pack process is usually within 15 working days.

The first day: Evaluate and discuss the requirements of the customer, and then make a quotation for the sample. After both parties have negotiated the price, they will customize the product. The second day: the selection of the product cell and the design of the circuit structure. Day Three: Samples will be made long after the design is complete. Day 4: Initial test and debugging of functions are completed. Day 5: Perform the electrical performance and cycle aging test verification of the lithium battery pack. Day 6: Packaging for safety test and launch. The whole process of lithium battery is completed in 15 minutes.

Custom parameters for lithium battery customization

1. Make sure the input and output ports of the lithium battery are somehow.

2. It is necessary to confirm the IP protection level of the lithium battery pack and the fixing method of the battery pack, and also consider how to install the lithium battery pack, which will have a great effect on the design of the lithium battery.

3. The size of the space for the lithium battery. This will affect the capacity of the supporting lithium battery pack. It is best to communicate with the lithium battery manufacturer before ordering the lithium battery, so as not to cause a great difference between the ideal and reality. The situation occurred.

4. What needs to be known in advance is the life expectancy of customized lithium batteries. The life of iron lithium batteries is generally 2,000 cycles.

5. You need to know how long the device will continue to work because it will determine the capacity of the lithium battery pack that needs to be ordered.

6. For devices with similar motors, when supporting lithium batteries, you need to know the instantaneous maximum power when starting these inductive loads.

7. Because the voltage of the lithium battery pack is not a fixed value and has a wide range, it is necessary to ensure that the device can withstand the corresponding voltage value.

8. Determine the size and shape of the battery, so that lithium battery manufacturers can reduce the scope when developing and designing. Grepow lithium polymer batteries can be designed and manufactured in a variety of shapes depending on the device, including round batteries, curved batteries, ultra-thin batteries and so on. If you ask, I will give you what you want!

Lithium battery customization

1) Custom-made mass-produced products for lithium battery packs are independently developed and designed for different products, so during the customization process, certain costs need to be paid (generally involving mold opening costs, development costs, and product proofing cost Wait).

2) R & D time: The length of the R & D time is directly related to the new time on the product. The general R & D time for custom lithium battery packs is about 30 days, and the fast R & D channel is implemented. Generally, the proofing time of products that do not require mold opening can be reduced to 15 days.

As an emerging industry, lithium batteries have developed rapidly in the past two years, and more and more companies have applied lithium battery packs to their products. A custom lithium battery pack came into being in this environment. Group, customized solutions for lithium battery UPS, dedicated to providing users with customized solutions and products for competitive lithium batteries.

If you are interested in our products, please don’t hesitate to contact us at any time! Email: [email protected] Grepow Website: https://www.grepow.com/

#custom battery #lithium battery

Overcurrent Charging Protection for Wearable Devices Batteries

The overcurrent charging protection function in the protection circuit of wearable devices battery is due to the automatic jump of the step when the test equipment reaches constant voltage or the overvoltage protection of the battery protection circuit.

Improper use can affect the performance of lithium polymer batteries, and even bring security risks. For example, overvoltage charging may cause the battery to explode, and a short circuit between positive and negative electrodes may cause a fire.

For this reason, lithium polymer batteries are generally equipped with special protection circuits in their applications. The battery-specific protection chip (usually called protection °C) cuts off the circuit when it detects misuse of the battery, thus protecting the battery.

The charging and discharging misuse of the battery includes charging or discharging to a normal voltage, using an excessive current for charging and discharging, and even short circuit directly between positive and negative electrodes.

Lithium polymer battery protection circuits widely used in wearable devices, usually designed with battery charging overvoltage protection, low voltage discharge protection, short circuit protection, and overcurrent protection, but for a long time, overcurrent protection only considers overcurrent discharging, not include protection against overcurrent charging behavior.

In this view, Grepow shaped battery engineer analyzes the overcurrent charging protection function and discusses the possible misjudgment of the laboratory. The test method of the feasible overcurrent charging protection function is given below.

Wearable devices battery overcurrent charging protection

If lithium polymer battery charging current is too large, it will have a large impact on the electrode material structure, result from serious polarization of the battery, and may even cause thermal runaway. Charging with large rate will also affect battery life. In addition, larger current requires a higher current carrying capacity of the product circuit, which is not conducive to the miniaturization of electronic products.

In the past, there was little protection against overcurrent charging designed for lithium polymer batteries of the wearable device, relative to other abnormal charge and discharge conditions. The battery charging behavior is usually easier to be controlled than the discharge behavior, and the overcurrent charging protection function is more expensive to implement than other battery protection functions, and it is necessary to collect the reverse current.

With the development of application fields, the possibility of lithium polymer battery packs being subjected to excessive charging current is gradually increasing. The emergence of various technologies such as wireless charging, fast charging, and high-rate batteries has also increased the probability that lithium polymer batteries will withstand excessive charging currents. Currently, most electronics companies have required battery pack suppliers to have this capability in their protection circuits. Grepow batteries are widely used in all types of wearable devices, all with overcurrent charging protection, in line with national safety requirements.

For the protection of excessive charging current, the most suitable method is to add the over-current charging protection function to the original battery protection IC. The smart battery series lithium polymer battery protection IC produced by Grepow battery company is a typical representative.

2.Verification of overcurrent charging protection

Usually, the wearable device manufacturer will verify the purchased battery pack, and the battery manufacturer will also verify the function of the protection board. When performing product certification or quality supervision and random inspection, the laboratory also needs to verify the functions of the battery pack. For overcurrent charging protection, the inspector needs to have the right technology to verify.

(1) Standard verification requirement

In the lithium polymer battery and battery pack safety requirements for wearable device products, the basic methods and requirements for testing the overcurrent charging protection function are: the charging current is 1. 5 times overcurrent charging protection current, charging voltage is charging upper limit voltage, the state of the test is constant current charging, repeating 500 tests, it is required that the battery pack’s overcurrent protection circuit should respond with each test.

Lithium polymer batteries for common wearable devices have an internal resistance of several tens of milliohms, and there is also impedance on the battery protection board. When the charging limit voltage is set to the battery, the maximum voltage difference between the charging voltage and the battery cell may not guarantee enough test current for the loop. Using the simplified Ohm’s law model we can calculate as follows:

Ucell + I/（Rcell + Rpcm）≤Uup （1）

In formula (1): Ucell refers to the open circuit voltage of the battery, Rcell and Rpcm are the approximate equivalent resistance of the battery and protection circuit, respectively, UUP is the upper limit voltage of charging, “I” is the current on the loop, then:

1≤ ( Uup – Ucell )/(Rcell +Rpcm) （2）

When the open circuit voltage of the battery is too high, or the upper limit of the set charging voltage is too low, or the resistance of the battery is too large, the loop current I may not reach the value of the overcurrent charging protection function of the trigger protection board. Therefore, the battery must be discharged to empty before the experiment.

(2) Use a large capacity battery

According to formula (2), if the other conditions are the same, only increase the load capacity of the battery (ie, replace the large capacity battery, discharge to empty before the test, that is, reduce the Rcell), will increase the allowed current in the loop. If you use a large capacity battery to connect the battery protection circuit, set the voltage of the DC power to the upper battery charging voltage (such as 4.2 v) to ensure that the over-voltage charging protection is not triggered; set the charging current to 1. 5 times overcurrent charging protection current. If the circuit is cut off after the output, it can be confirmed that the overcurrent charging protection function of the protection circuit exists.

(3) Oscilloscope assisted analysis

According to the manual of the protection IC, the delay of the protection circuit is different when the protection circuit detects overcurrent charging and overvoltage charging. The overcurrent charging protection usually has a delay of a few milliseconds to several tens milliseconds, while overvoltage charging protection is in second. According to the delay phenomenon, it can be judged whether the protection circuit has an overcurrent charging protection function.

Tested by oscilloscope and DC power, it can accurately verify the existence of overcurrent charging protection; if directly observe the reflection of DC power, it is easy to confuse the two protections.

Wearable device battery conclusion

The overcurrent charging protection function of lithium polymer battery products is not only the requirement of mandatory national standards for battery safety but also an important inspection item in the quality supervision and inspection of battery products. To test the protection function of overcurrent charging in the laboratory, it is necessary to add auxiliary judgment means on the basis of traditional test equipment. The detection method proposed by Grepow can accurately evaluate whether the battery protection circuit of wearable devices has an overcurrent charging protection function.

#wearable battery

Key Considerations for Custom Curved Batteries You Should Know

Basic properties of a custom curved battery

Basic information on curved battery

What is a curved battery?

The curved battery mainly refers to the polymer curved battery, which is a kind of polymer battery. It has a curved state during the lithium battery manufacturing and molding process, and the finished product is generally seen with the arc. So most people call it a polymer curved battery.

With ultra-thin features

Another characteristic of the curved battery is that it is thinner. It is two-thirds thinner than ordinary polymer lithium batteries. The thickness can be as thin as the thickness of the card battery (Grepow ultra-thin battery can achieve 0.4mm thickness, thinner than the card）but changes in shape.

Application of curved battery

The battery capital thinks that it is the most prominent among common consumer electronics products, like smart bracelets, ultra-thin waterproof bracelets, electronic keys, Bluetooth headsets, curved electronics Most of the above devices are powered by this curved lithium battery.

The basic performance of the custom curved battery

Different types of curved arc batteries can be customized according to requirements.

Curved battery rated voltage: 4.35V.

Charge and discharge voltage: 3.0 ~ 4.4V.

Charging temperature: 0 ° C ~ + 45 ° C.

Discharge temperature: -20 ° C ~ + 60 ° C.

Storage temperature: -10 ° C ~ + 45 ° C.

standard charge: 0.2C, maximum charge: 2C.

Standard charging method: 0.2C CC (constant current) charge to 4.4V, then CV (constant voltage 4.4V) charge until charging current ≤0.05C, maximum discharge current: 2C.

curved battery weight: between about 4g ~ 10g.

If the curved battery is subjected to secondary finished product PACK, then it is necessary to add protection plates, wires, insulation materials, and other methods to the battery to assemble, and 100% finished product testing, so as to ensure that the yield is improved during use. If you can contact us at [email protected], we will tailor your products and ensure the safety and reliability of lithium batteries.

We can accept the customization of other parameters if you need it. Includes temperature range at temperature -50 ℃~50 ℃ or 20 ℃~80 ℃, capacity, rate, etc. Grepow can provide integrated power solutions according to customer requirements. If you need anything different from this parameter, please send us more details for the evaluation.

The process of a custom curved battery

Customized battery specific requirements

Because the curved battery is also called polymer curved arc lithium battery, because it is made using a polymer solution, the appearance packaging is aluminum plastic film packaging, where to make curved arc lithium batteries, please propose Your specific use of the battery, the use environment, charge and discharge specifications, finished product size requirements, voltage capacity, and other needs, our engineers will evaluate the feasibility of the solution according to your lithium battery customization needs, and then issue the corresponding technical information.

Guess how many degrees does this curved battery bend?

Guess how many degrees the polymer curved battery above is bent. Most people really can’t guess exactly, suggesting that the degree of bending is less than 180 degrees.

The dimensions of the Grepow curved battery as bellow:

Cost of mold

We already have molds for some battery models that can be produced directly. But for the new model, the curved battery needs to be opened during the manufacturing process, which will involve the mold cost. In addition, the arc lithium battery is poor inconsistency during the production process. The yield rate is lower than that of other cylindrical 18650 lithium batteries. In terms of price, it is also higher than ordinary polymer batteries. You must be aware of this. Since portable suitcase energy storage batteries are used more outdoors, we will propose a system usage specification. Please refer to our battery use specifications for correct use. And this kind of portable suitcase energy storage battery and portable energy storage emergency power supply are in There are differences in shape and size specifications, please do not confuse.

Battery production time

The production cycle of curved arc batteries is generally 45 days after confirmation. Of course, when you contact us to make a request, we will tell you these contents. Normally, the price will be 2 hours, the plan will be delivered in 1 day, the sample will be delivered in 18 days (GREPOW provide Rapid Sampling Service, Grepow assists in cell design and cell modeling, curved arc batteries can be manufactured and tested in as early as 20 days) and the large shipment will be delivered in 50 days. Both parties confirmed the plan.

If you have any other questions, please contact us in time. The above is the customized polymer curved battery for the reference of netizens. The details are subject to negotiation or contract between the two parties. Check the curved battery page for more information about the polymer curved battery.

#Curved Batteries #custom battery #lipo

How do Novel Battery Drive Innovation?

Today, everyone is tied to the high-speed train of technological progress. The introduction of new technology is almost always a competition between different models. Few people think about improving the quality of products or services so that consumers can have a better consumption experience. Because you haven’t settled down to make a good product yet, you’ve got the next competitor that’s going to disrupt the whole business model.

Every time you turn around, another company comes out with a breakthrough product that claims to have a profound impact on our lives and work. But how often do consumers actually experience disruptive innovation, as smartphones and cloud computing have done in our lives?

Many of the new products hitting the market today are not shocking but merely upgrades to their predecessors — perhaps with a smaller footprint, faster processors, more attractive packaging or additional features. These upgrades often overwhelm customers, with no compelling reason to justify the price increases that accompany them.

Consumers want disruptive technologies that can really improve their lives, whether at work, at home or in games. That’s what product manufacturers want to offer. So what’s holding them back?

Limitations of conventional batteries

The challenge is not to imagine exciting new products. Suppliers are good at this. Conversely, when it comes to consumer-centric electronics, the culprit is usually conventional, rigid and chunky batteries, which limit the batteries designed around them. But it doesn’t have to be this way.

The development of Grepow’s novel battery can stimulate a whole new level of product differentiation. Even after years of use, the batteries are still an unfamiliar concept to many product designers accustomed to conventional off-the-shelf energy storage in a rigid and fixed shape. Some people find it hard to believe that batteries are curved and still maintain their performance and safety. As a result, they designed their products around rigid battery parameters.

Novel battery commitments to flexibility

Fortunately, even for mass production, novel battery technologies are now available.

Despite the appeal of novel battery technology, we find ourselves having to reassure manufacturers that novel batteries are as reliable as their rigid ancestors. Our tests show that the novel battery has strong performance integrity. Not only can they be the ultra-thin battery, as thin as 0.4mm, but they can also be made into curved batteries, which have roughly the same capacity as non-curved batteries, without compromising performance.

This flexibility gives designers and engineers new latitude in hardware design: manufacturers can now place batteries in previously impossible or impractical Spaces. Take smartwatches. Engineers can embed special thin batteries in the watchband to increase the available energy or extend battery life, rather than just keep the battery in the head case.

With the growing demand for wearables and audio devices, smart clothing and other personal battery-powered products, consumers want more natural experiences. Unlike stationary off-the-shelf energy solutions offered in a limited range of dimensions and capacities, the novel battery can be customized to size, thickness, and capacity, enabling the development of smaller, lighter, and more comfortable products.

The other problem with rigid batteries is safety. Advances in electrolytes have made novel batteries safer. The latest polymer electrolyte is safer because it does not contain liquid that would leak if the battery were punctured or punctured – but it still has the same high ionic conductivity. This is a huge advantage for wearables makers in medical devices, sports equipment and fabrics, industrial applications and consumer electronics. Knowing that their devices contain more secure components not only gives manufacturers and consumers peace of mind but also increases adoption and usage.

Staying competitive in any technology-driven market requires constant innovation. In order to rise above adversity, companies must be fearless in accepting progress that stands out in the marketplace. Battery choice is critical to your hardware design – especially if the consumer will have direct access to the battery. The performance inherent in the next generation of novel batteries and enhanced security allows you to free up time to create disruptive products that provide compelling user experiences.

For more information, visit the novel battery.

#novel battery #lithium battery

Novel Battery to Innovative Medical Technology Design

Advances in technology are pushing manufacturers to create desirable products that achieve greater functionality, greater convenience, and faster results. This is evident in all aspects of work and daily life, from consumer products such as smartphones and watches to the blockchain, cloud services, and enterprise-class smart factories. Medicine is no exception.

Trends in medical device design

Wearables are so common these days that we rarely think about them. Some smart bracelets and smartwatches have multiple tiny, sensitive sensors that can monitor your steps, heart rate, sleep, and even your menstrual cycle based on your input. A smartwatch that “monitors you” is accurate enough to see if the data it collects can identify abnormal heart rhythms, including those that cause severe arrhythmias.The blood vessels of the heart. However, in terms of the scale of the technology, the data collected by wearables is still in its infancy. The rise of artificial intelligence has foreshadowed the preventive and the paradigm shift of personalized medicine: provide sufficient for algorithm, good data, one day may be in danger of falling, swallowing problems, heart attacks and even your voice changes, which may indicate depression, Parkinson’s disease and other diseases of the disturbing attacks.

One of the major trends in the healthcare industry is the shift from public to private — from hospitals to homes. Even digital marketplace providers, such as Amazon, Google, Apple, Microsoft, and IBM, are moving into the home health space, bringing accessibility and affordability, according to Forbes.

The medical market shows encouraging growth. By 2023, the global medical device industry is expected to reach $409.5 billion, with a compound annual growth rate of 4.5 percent. From 2017 to 2023, the home-care medical device market is expected to grow at a compound annual growth rate of 7.1% to $35 million. With this changing healthcare architecture, the need for personalized and connected devices that can continuously track user data and transmit it to network systems and clinicians is growing rapidly. Thus, two major trends driving the design of medical devices are worth exploring: personalization and the complexity of driving the Internet of things.

The necessity of equipment design

What kind of products are needed to meet the needs of personalized, interconnected medicine? Smart wearables and the Internet of things devices not only make it easier to track users’ biometrics and progress in hospitals and homes but also make home-care treatments more effective and thus possible.

Advanced user-centered devices also allow the health care industry to progressively analyze current health conditions and accumulate data on preventive measures. In this way, device sensors are used not only to monitor the recovery of sick patients but also to capture abnormal data or symptoms in people who are not yet sick or injured.

What if there’s a medical device that’s rich in features that can monitor patients and provide preventative alerts, but can be awkward to wear or walk around for older, very young patients or others?If they don’t use it, who will go wrong and their health will suffer as a result?Not the user.

If people don’t use the product properly, the problem lies with the device designer. Clearly, wearables need to be comfortable to encourage regular use. If consumers do not wear them regularly, fewer data will be collected. As a result, they will receive worthless or, worse, inaccurate analyses and recommendations that harm patient care. In short, intuitive design will increase adoption rates and the likelihood of successful treatment.

The battery barrier

The need for personalization and the use of IoT connected devices with greater capabilities that need to run continuously present device design engineers with new challenges — and raises concerns about the limitations of today’s medical batteries.

The rigid, bulky shape of the battery often hampers the comfort of wearables and the availability of internet-of-things devices. Smartwatches and other smart devices are so popular because they improve and improve everyday life. However, rigid and bulky batteries are thick and unbending, so forming them into well-designed, portable and practical products is challenging.

Advances in batteries have broken down barriers

How do we address the challenge of batteries as a barrier to the Internet of things and wearable medical devices? By having a more compliant adaptive shape factor. They must be thin, even curved, and powerful and rechargeable, so they can be used to design compelling wearable and intuitive wearable devices.

The good news is that the new generation of lithium-ion batteries has the required flexibility.

For example, Grepow’s novel battery comes in a variety of shapes, such as round, curved, triangular, hexagonal, and so on. The capacity of the curved battery is basically the same as that of the non-curved battery. Tests like this show that device designers don’t have to sacrifice performance to improve the flexibility of energy storage.

This flexibility is essential for bendable or curved products. This is also important for non-wearable devices, which make it easy to integrate batteries into existing devices and turn them into smart, internet-connected devices. The novel battery is as thin as 0.4mm to 8mm. This allows them to be seamless in the device and achieve a comfortable feeling of wearing.

Look for the customizable novel battery that can be supplied in different sizes, shapes, and capacities depending on the specific needs of the device manufacturer. With this capability, device designers are no longer constrained by the fixed size and shape of conventional batteries. They have greater freedom to design innovative, user-friendly medical and Internet of things devices.

Safety is another important factor to consider when evaluating batteries for medical and other devices. Safety is clearly a major concern for manufacturers and consumers. Especially with wearable devices that touch the human body, it’s important to make sure that dangerous battery components don’t pose a risk to the user.

Typically, lithium-ion batteries contain liquid, solid or gel electrolytes. The most common form of electrolyte used in such batteries is liquid, which can leak and catch fire when it gets too hot. This is a major cause of many accidents, and understandably makes liquid-electrolyte batteries the second-best choice for the next generation of medical devices and smart wearables.

Solid electrolytes, on the other hand, are safer because they do not burn. However, due to the low ionic activity of the electrolyte, this safety function cancels out the performance. Moreover, solid-state ceramic batteries do not provide the flexibility needed for wearables and innovative IoT applications.

Gel electrolytes offer the best of both worlds for medical wearables and the Internet of things while providing security and flexibility. Because of the shape of the gel, there is no electrolyte leakage even if the device is punctured or punctured, so the risk to the consumer is minimal.

A new day in the life

If the novel batteries were integrated into his medical wearable device, how would the patient’s daily life improve?

If the patient’s wristband is powered by a thin, rechargeable, curved (and therefore unobstructed) battery, he will wear it comfortably. It will be his habit to keep on.

If a patient happens to have a stroke while driving, his wrist monitor can indicate a road break and sensors in the tires (which can also be powered by novel battery) to safely stop the vehicle. The monitor also alerts doctors and sends text messages to her daughter.

Patients will also wear a smart transdermal patch powered by an ultra-thin battery that seamlessly fits the arm. The patch will immediately release an emergency dose of antihypertensive medication and write it into the patient’s 24/7 medication record.

A patient’s smart medical wearable device can also help with doctor visits. His wristband sends blood pressure readings to nurses, while the smart patch drug releases the necessary dose as planned and collects accurate data on hospital servers. If a patient’s blood pressure exceeds the normal range, an alert will be sent to the doctor.

The patient can also be treated by wearing a smart band powered by a flexible rechargeable novel battery that sends continuous progress information to her physical therapist and doctor. spends less time on office visits and more time on recovery.

As you can see, the development of thin, curved batteries is breaking free from the constraints of design engineers. With batteries no longer a limiting factor, medical device manufacturers now have the right energy solutions to deliver the most advanced devices in a personalized and internet-driven complexity driven healthcare industry. With novel battery, they are free to innovate extremely comfortable, reliable and safe smart, high-performance and feature-rich connected products. The possibilities are endless.

#Medical Battery

The Secret to Special Batteries for IoT Devices

Nowadays, it’s hard to find an unconnected device anywhere. According to Stringify CTO Dave Evans, another 127 “things” are connected to the Internet every second, and Gartner predicts there will be 25 billion IoT devices by 2021.

Connected devices are valuable only for the data they collect, the knowledge they impart, and the actions they take from the analysis of the data. This applies not only to larger, high-profile applications such as smart homes and cities but also to a growing number of smaller IoT applications. These smaller applications (such as smart tags, smart packaging, smart pills, smart tags, smart CARDS, smart medical devices, and various wearable devices) affect life and business every day.

As more and more things become connected devices, the type of power they use comes into play.

They play a surprisingly large role in how effectively they sense and transmit data, and how available (and therefore frequently used) they are. By virtue of their thick, rigid conventions, manufacturers of off-the-shelf batteries often suffer from design constraints that limit their success.

Advances in energy storage could make devices truly usable

Energy storage solutions are more advanced than many manufacturers realize. New battery innovations give manufacturers the freedom to create truly user-friendly IoT devices for efficient data sensing and transmission. Lightweight, thin, flexible and flexible next-generation high-performance battery solutions can be seamlessly integrated into connected devices. This results in a more aesthetically pleasing design of the device’s hardware, which provides better user experience and higher comfort, and ultimately leads to wider market adoption.

For example, if a patch used for monitoring biometric features or for therapeutic purposes is embedded in a thick, rigid battery unit, the user is uncomfortable to wear it. This discomfort limits its use time, resulting in a small amount of data collection that is not conducive to analysis. However, if the patch has a seamless integration of thin and flexible batteries, it will not interfere with their daily activities. In fact, the user is not even aware of wearing it. This will naturally increase usage. As each consumer USES patches more frequently, more data can be collected and more valuable feedback can be provided.

Key advances in special batteries

So how flexible are special batteries? Very much. Even if the battery is curved, the battery still has the same charge-discharge performance as the non-curved battery. For devices that need to be bent or bendable, this flexibility must be provided and ultimately help consumers to use them comfortably.

Other major advances in special batteries are related to weight, safety, customization, and thinness. The battery thickness can be as low as 0.4mm. This thickness is useful for sensors, smart CARDS, wristbands and other applications where weight and thickness are critical to success. These functions are also key to enabling the battery to fit into the narrow space in the device’s hardware.

The next generation of batteries must also be safer. Even if manufacturers make great efforts to ensure the battery’s durability and international safety tests are required, this is no guarantee that the battery will not overheat, explode or leak. Special rechargeable batteries made with lithium polymer electrolyte technology have higher safety than those made with liquid electrolyte. The electrolytes in special batteries are highly resistant to heat and do not leak when punctured.

Manufacturers can now choose to customize special flexible batteries to make better use of the space and hardware design of their devices, rather than using off-the-shelf rigid batteries. Engineers and designers can now leverage battery manufacturers’ custom services to create flexible battery solutions without having to revisit their designs at the end of the creation process because these off-the-shelf batteries are not suitable for optimized product designs. Best meets its size, capacity, thickness and shape requirements, and provides a better user experience.

As many things become “smart”, competition among makers of connected devices is fiercer than ever. The type of battery that device makers use to power or transmit data to smart devices or their components plays an important role in the innovation and utility of their devices, as well as the purchasing power to attract users.

The next generation of special batteries is key to delivering the highly available, aesthetically pleasing and reliably connected devices that give forward-looking IoT device makers a competitive advantage.

#special battery #iot

How Long Does the Battery on a Smartwatch Last?

With the development of smartwatches, people are increasingly using smart products, so the development of smartwatches is becoming more and more prosperous. Although smartwatches have the power of many traditional watches, it also has a huge weakness, which is smartwatch battery life.

Smartwatch battery life problem

The smartwatches sold in the market have different tolerances in terms of battery life, and the length is 5-7 days and the hours are short. For Smartwatches, even for up to 5-7 days, it is still difficult to meet the needs of ordinary users. After all, Smartwatches first exist as watches.

Since 2013, lithium-ion polymer batteries have gradually replaced ordinary liquid lithium batteries. Since then, the energy density of smartphones has made a huge leap. In 2013-2014, many smartphone manufacturers began to build internal batteries, and the operating voltage of smartphone batteries began to increase from 3.7V to 3.8V. Smartphone battery specific capacity (also known as gram capacity, refers to the amount of electricity per gram of battery) ) reached a peak again.

Even so, the battery life of the smartphone has also encountered a “stay”. In the face of the high power consumption of today’s smartphones, lithium batteries have become a bit “incapable”.

Of course, smartphone manufacturers are also constantly looking for new ways to improve battery life, expand battery capacity, charge through external power sources, and even hope to significantly improve battery life by replacing fuel cells and bio-batteries with new battery technologies.

Under the nurturing of intelligent manufacturers, users who use smartphones have become accustomed to “one day a charge” or even “more than one day.” However, Smartwatches cannot be treated in the same way. Not to mention the tedious “one-day charge”. If it is a user of a Smartwatch, who would like to charge it with an external power supply every day? How to make consumers more convenient to use is a problem that Smartwatch manufacturers must solve.

Smartwatch function

The current smartwatch battery capacity on the market ranges from 300mAh to 500mAh. The size of the battery used in the watch is related to the size and structure of the watch itself and is affected by the watch system and functions. Can do it for a long time, and really use it, I feel that there is no electricity! Let’s take a look at the power consumption of this function of the Smartwatch! The following is calculated by the 500mAh Smartwatch battery:

Sports step

The Smartwatch’s main sports function, when other functions are not open, the step-by-step function is turned on all the time, from morning to night to sleep, in the case of normal exercise (according to 13000 steps), it can consume about 30% of the Smartwatch power, so Although the sports step is the main function, it is not the most power-hungry.

Connect mobile phone Bluetooth

Many Smartwatches can match the mobile phone’s Bluetooth before using the APP for message push. The Bluetooth call function, if there are few messages pushed, can see that the basic power consumption is very small, but if you are a chat enthusiast, there is a lot of news all day long. In particular, when Bluetooth is connected to the phone, the power consumption of the Smartwatch is gradually increasing.

Heart rate monitoring

Occasionally measure the heart rate, you can ignore the power consumption. Some Smartwatches have a heart rate monitoring in real-time around the clock, so this is careful, the Smartwatch battery can be used up in a few hours, after all, the heart rate is dependent on the light, the continuous light and feedback, resulting in Smartwatches consume very much electricity Big.

GPS positioning

Smartwatch battery is absolutely killer, even on large-capacity mobile phones, we can see, let alone small watches. If the watch does not turn off the GPS, basically one hour, you need to charge. Therefore, the GPS intelligence of the watch is used as an auxiliary device and cannot always be kept open.

Elevation compass, etc.

These are always open and very power-hungry. Because of the constant measurement and acquisition of data, it is no doubt that heart rate real-time monitoring and GPS are the same.

Other accessibility features

Other auxiliary functions, the basic power consumption can be ignored.

Through the above, it can be polished. Basically, the culprit of Smartwatch power consumption is the more advanced functions of some mobile phones, but the functions of outdoor sports itself, but not counting power. So if it is purely for outdoor sports, then the Smartwatch function is as simple as possible. If you want to feel the highlights of the smart wear era, you can choose the Android watch, but also based on the sacrifice of power consumption.

In the previous technology, every time the electronic exhibition, the battery has not yet had a good solution. Until GREPOW’s custom battery solutions include a Smartwatch battery solution. We specialize in off-the-shelf, semi-custom, and custom batteries, and we’ve been in the industry since 1998. With over 200 engineers and 3,000 workers in our factories in China, we are confident in our experience to deliver outstanding products. GREPOW’s breakthrough in the battery is a great contribution to the development of the era of technological intelligence.

If you are interested in our products, please don’t hesitate to contact us at any time! Email: [email protected] Grepow Website: https://www.grepow.com/

#smartwatch battery

The Wearable Biofuel Biofuel Cell Using Sweat Has been Developed

A unique new flexible and stretchable device, worn against the skin and capable of producing electrical energy by transforming the compounds present in sweat, was recently developed and patented by CNRS researchers from l” Université Grenoble Alpes and the University of San Diego (U.S.). This novel battery is already capable of continuously lighting an LED, opening new avenues for the development of wearable electronics powered by autonomous and environmentally friendly biodevices. This research was published in Advanced Functional Materials in September 2019.

The potential uses for wearable electronic devices continue to increase, especially for medical and athletic monitoring. Such devices require the development of a reliable and efficient energy source that can easily be integrated into the human body. Using “biofuels” present in human organic liquids has long been a promising avenue.

Scientists from CNRS/Université Grenoble Alpes who specialize in bioelectrochemistry collaborated with an American team from the University of San Diego in California comprising experts in nanomachines, biosensors, and nanobioelectronics. Together, they developed a flexible conductive material consisting of carbon nanotubes, crosslinked polymers, and enzymes joined by stretchable connectors that are directly printed onto the material through screen-printing.

The biofuel cell, which follows deformations in the skin, produces electrical energy through the reduction of oxygen and the oxidation of the lactate present in perspiration. Once applied to the arm, it uses a voltage booster to continuously power an LED. It is relatively simple and inexpensive to produce, with the primary cost being the production of the enzymes that transform the compounds found in sweat. The researchers are now seeking to amplify the voltage provided by the biofuel cell in order to power larger portable devices.

As one of the most special members of the energy family, the biofuel cell is a kind of real green battery. Using organic matter as fuel and enzyme as catalyst directly or indirectly, the energy conversion rate is theoretically quite high. At present, however, the inactive parts of biological cell membranes or enzyme proteins present great resistance to electron transfer, which in turn affects the efficiency of the entire battery. That is the inevitable hurdle that needs to be overcome in order to develop a viable biofuel cell.

#novel battery

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