FAQ: What is the Cycle Life Estimation of the Elerix Cells
As given in the datasheet the cycle lifer is specified by the charging and discharging speed, the depth of discharge and the operational temperature.
The typical life span is given at this:
Cycle Life at 80% DOD ---- 3000 cycles ---- @0.3C/1C, @25°C, >80% SOH
This means that for the charging with 0.3C and discharging with 1C, at the 80% depth of discharge (80% DOD) and the monitored temperature 25°C, the cell will age to 80% of State of Heath (SOH) in 3000 cycles.
The 80% SOH is the typical “end of life value” for the LiFePO4 technology, meaning that the nominal capacity of the cell will drop from the original 100% to 80%.
In this scenario the cycle takes following time: discharge 80% at 1C - about 50 minutes, rest time 1 hour, charge at 0.3C – about 3 hours, rest time 1 hour. Total time per cycle is 5 hours.
With some time-reduction on the rest time, it is possible to perform up to 5 cycles in a day. This means that 3000 cycles correspond to 600 days of continued cycling. This is about 1.6 years.
ESS Cycle Life at 60% DOD ---- 6000 cycles ---- @0.3C/0.3C, @25°C, >60% SOH
The ESS cycle life is given at 0.3C charging and 0.3 discharging at the 60% depth of discharge (60% DOD) and the monitored temperature 25°C. This corresponds to a typical usage in energy storage applications (ESS).
In this scenario, two cycles per day are calculated as the typical performance. With this number of cycles, the life span of 6000 cycles corresponds to 3000 days of continued cycling. This is more than 8.2 years of the continued usage.
The above graph show some possible scenarios of the life spans for the typical ELERIX products in various modes of operation.
Please take note that the crucial condition for the long-time operation is the contact temperature of the cells, and the limiting of the current peaks to the maximal continued values.
For more support on ELERIX products, be sure to get in touch with the GWL Team.
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