siai47 wrote:In answer to bobakka's 20% loss post, I would go back to the point that the BMU "masks" the battery degradation by limiting how low the cell voltages go until a minimum is reached and then the true capacity loss starts to be noticed.
If I understand you correct your hypothesis is that the cell voltage for SoC = 0 decreases as the the battery and car gets older?
That is for example when new SoC = 0 is equal to a cell voltage of for example 3.5 V
and when driving 10 000 km SoC = 0 the cell voltage is 3,4 V
and when driving 20 000 km SoC = 0 the cell voltage is 3,3 V - and so on..
I yesterday drove to SoC = 10,5 in minus 6 C (battery voltage above 15 C) with cell voltage from 3,615 down to 3,575.
(I see however in my iMiev that SoC and cell voltage does not have a consistent relationship. I assume that is either due to large fluctuations in SoC calculations, temperature or driving style prior to measurement time)
If your hypothesis is right, Pier with a new battery pack should have with same SoC higher cell voltages than my iMiev.