Hi Gokul,
In the result it indicates that the battery capacity drops from 20 Ah to 13.3 Ah over the course of 5 WLTP profiles. This is a quite significant drop and may not be entirely realistic depending on the type of battery used, the specific conditions of the test, and the battery's overall health.
- Lithium Iron Phosphate (LFP) batteries, typically have good cycle life and do not degrade rapidly under normal cycling conditions. A drop from 20 Ah to 13.3 Ah over 5 cycles would represent about a 33% decrease in capacity, which is quite large for a short time.
- The WLTP (Worldwide Harmonized Light Vehicles Test Procedure) profile involves dynamic loads that simulate real-world driving conditions. This means that the battery is subjected to high C-rate discharges and potential high currents that could stress the battery more than typical steady-state cycling.
- However, under these dynamic loading conditions, a loss of 33% capacity in 5 cycles seems excessive unless there are extreme stress factors involved.
- As the battery is cycled between 2.5 V and 3.8 V, if there is overdischarge below 2.5 V or overcharge above 3.8 V, it could cause accelerated capacity fade.
- Check the initial SOH of the battery before starting the test. If the battery already had some degradation, the results might be more realistic.
- Excessive capacity fade can be caused by improper balancing, poor contact, or other non-chemical issues in the system.
You can refer the below link for more info on Battery Health
