Nubo
Well-known member
Slow1 said:Nubo said:As the cells degrade their internal resistance rises. Internal resistance is one of the factors that determines the maximum acceptable charge rate. Consider regen to be a form of fast-charging. As the internal resistance increases and the overall capacity decreases, the maximum charge rate will decrease. The computer adjusts the regen parameters to match this reality.
So then is it correct to assume that the same effect will affect DCQC? i.e. as batteries age/degrade the maximum DCQC rate will decrease?
I would expect DCQC performance to be reduced too. But keep in mind that the average LEAF pack may experience much more kWH over its life from regen than it does from ChaDeMo. And so when programming the firmware, a decision might be made to limit regen more rigorously than DCQC. a) it's likely to have a bigger effect b) for many drivers there would be less perceived inconvenience for somewhat reduced regen as compared to a lengthier DCQC stop. The final parameters are not only driven by the pack's physical maximum capabilities, but by goals such as extending pack longevity. Earlier LEAFs seem to have been hit with regen reductions by firmware updates while newer models seem to have robust regen profiles. I would speculate this derives from attempts to mitigate the degradation problems of earlier models.