CanisLupus wrote:This is what I want to suggest .
I think that , perhaps , only the voltage of the battery is being used to calculate the SOC .
It seems clear , however , that the temperature of the battery is also a factor in determining how much charge it is holding .
The temperature of the battery is available .
Can the SOC calculation factor in battery temperature .
This would change voltage readings and perhaps the issue that arises is that the 100% SOC voltage for lower temp batteries
would be higher , possibly approaching absolute 100% values .
So the question is ' Is the maximum voltage of a colder battery actually higher than the optimum temp battery ? ' .
I'm not able to check the battery voltage at 100 SOC under low temperature conditions since the pack is quite warm, about 55F, when at 100 SOC in my case (my car is in garage overnight). I have a sreenshot I took from ISTA+ to check cell balancing at low SOC
The temp was about 55K as well, as you can see
If you have a voltage vs. SOC plot for i3, you could check if your assumption is correct for these conditions vs summer temperature at least. However, I've seen no similar screenshots with cell voltage over 4.09V for 100% SOC yet.
As to the battery capacity related to cell temperature, I've seen some data only on Zoe here https://pushevs.com/2019/02/10/renault- ... ery-specs/
. Once the pack's temperature goes to 32F, the pack can hold only 90% of its normal charge amount.