Direct ac like in the i3 is the best method but maintenance is a nightmare if the compressor fails and sends metal shards into the ac pipes within the battery. Relatively lightweight system too.
Outlander and e-NV200 both use it without thermal issues. As with any actively cooled car, the car needs a working air con system. I see occasional reports of problems charging when the air con has failed.
The Leaf 30 might be fine with passive cooling, the Leaf 40 has all sorts of problems. Generally the data shows that the better cooled batteries capacity loss is slower and high charging rates can be sustained for longer.What matters is how well the battery performs, not how it is cooled.
LEAF 30 does just fine with passive cooling.
Early Tesla Model S can hit thermal limits even though the pack is liquid cooled.
Battery chemistry, margin and BMS have a lot to do with longevity too.I think the concern is around longevity, not performance.
Only if you wish to work the car harder then forced cooling can cope with, using air from an AC unit and you get even better cooling then simple forced air.
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Interesting read. I wish that it had gone into the software, service, infotainment, etc. in as much detail, but considering all of that is usually covered over - VW Group are really keeping it close to their chest. I can only speculate that they are perhaps a) hoping to be really innovative and have a clean market distinction b) they are struggling with the technology. With the Car-Net (We Connect) experiences - I worry about b) but hope for a).This -->
Volkswagen, the company that brought us Dieselgate, wants us to forget its last eco-disaster by promising to bring affordable electric cars to the masses starting in 2020. Those cars will ride on an all-new electric platform called MEB. The automaker calls it “one of the most important projects...jalopnik.com