I am using LiFePO4 battery, I measured DCIR using the discharge pulse. I found that the measured value of DCIR changes with respect to both pulse current and SOC. I provided adequate rest period before the pulse and after.
I dont understand the following behaviour. Could anyone give some hints to understand?
1. Why DCIR values are high at both low SOC (90%)? I assume that the high resistance in low SOC is due to lower lithium concentration. What about high SOC?
2. Why DCIR value changes with pulse current? is it an error? Duration of the pulse, temperature remains the same.
Thanks in advance.