The difference between battery reliability test and safety test
What are the main aspects of secondary battery performance?
Voltage, internal resistance, capacity, internal pressure, self-discharge rate, cycle life, sealing performance, safety performance, storage performance, appearance, etc., others are overcharge, over-discharge, solderability, corrosion resistance, etc.
What are the electrical performance indicators of mobile phone battery blocks?
There are many electrical performance indexes of the battery block. Only the main electrical characteristics are introduced here:
Battery block capacity: This indicator reflects the amount of electrical energy that the battery block can store in milliampere hours, for example, 1600mAH means that the battery can be continuously discharged for one hour at 1600mA.
Battery block life: This indicator reflects the number of repeated charge and discharge cycles of the battery block.
The internal resistance of the battery block: the smaller the internal resistance of the battery block, the better, but it cannot be zero.
Battery block charging upper limit protection performance: When charging a lithium battery, the upper limit of its voltage has a rating. In any case, the voltage of the lithium battery is not allowed to exceed this rating. It is determined and guaranteed by the IC selected on the PCB.
Battery block discharge lower limit protection performance: When the lithium battery block is discharged, the voltage of the lithium battery is not allowed to be lower than a certain rating under any circumstances. The rating is determined and guaranteed by the IC selected on the PCB. It should be noted that, when the general lithium battery block in the mobile phone is discharged, the lower limit protection value has not been reached, and the mobile phone is shut down due to insufficient battery power.
Battery block short-circuits protection characteristics: When the exposed positive and negative plates of the lithium battery block are short-circuited, the IC on the PCB board should be immediately judged and reacted to turn off the MOSFET. When the short-circuit fault is eliminated, the battery can immediately output electrical energy. These are identified and executed by the IC on the PCB.
What are the battery reliability test items?
Generally includes:
Cycle life
Different rate discharge characteristics
Different temperature discharge characteristics
Charging characteristics
Self-discharge characteristics
Different temperature self-discharge characteristics
Storage characteristics
Over-discharge characteristics
Internal resistance characteristics at different temperatures
High temperature test
Temperature cycle test
Drop test
Vibration test
Capacity distribution test
Internal resistance distribution test
Static discharge test ESD.
What are the battery safety test items?
Generally includes:
1.Internal short circuit test
Continuous charging test
Overcharge
High current charging
Forced discharge
Drop test
Drop test from a height
Penetration test
Plane crushing test
Cutting experiment
Shelf test in low pressure
Thermal abuse experiment
Water immersion experiment
Burning experiment
High pressure experiment
Baking experiment
Electronic furnace experiment.