GRA wrote:...The LEAF is the only PEV employing passive cooling...
I believe VW is still using conductive cooling, which it introduced in the Golf:
https://www.autoblog.com/2014/03/31/vw- ... m-battery/
VW decides against active-cooling system for e-Golf lithium battery
...VW engineers tested the NMC cells in places like Death Valley and Arizona and found they didn't warm very quickly either through operation, charging (including during fast charging) or through high ambient temps. "The need for a cooling system wasn't there," Harrison said. Since the cells work so well, all the e-Golf needs to keep the battery pack at the right operating temperature is an intelligent thermal control (which regulates the amount of energy expended form each of the cells to keep the heat down) and the ability to dissipate what heat is created into the chassis and away from the pack....
GRA wrote:...The Soul uses cooled air from the cabin, and Phoenix conditions are too much for it...
In all likelihood, "air cooling" is really more of a placebo, than functional. (edit)
GRA wrote:..Nor is liquid cooling a panacea, as it depends on the cooling system temp setpoints. The Focus has much higher setpoints for cooling to kick in than the GM models do, and the battery suffers accordingly...
Why do you keep repeating the same uninformed statements ?
You have no factual basis for your assertion of why
the focus packs failed so miserably, (extremely low efficiency/extremely high capacity loss, very similar to the poor performance of the liquid-cooled TSLA packs used in Mercedes B's) and the Chevy Sparks didn't appear to be doing much better in terms of capacity loss, before their own (gentle, low miles driven) testing was terminated:https://avt.inl.gov/vehicle-button/2015-chevrolet-spark
The only real conclusion from the AVTA testing is that all the BEV packs tested suffered significant capacity loss when used,
while Volt packs, usually just being carried as refrigerated ballast
, while the ICEs were used for propulsion, did just fine.
As to the Bolt, GM seems to have adopted a lower-cost simplified cooling plate
system, the effectiveness of which in different climates we will not know for many years, if ever:http://www.hybridcars.com/2017-chevy-bo ... x-details/