evchels said:
GM pursued a much more complex (and expensive) liquid thermal management, while Nissan went with a simpler air-cooled system. How much that matters (and in what areas, specifically) remains to be seen. ... Personally, I think it'll matter more in winter months than summer months, but these types of choices also play into the cost difference.
It will matter a whole lot more in hot climates than cold ones. The Leaf's pack relies on conduction and radiation for cooling, not convention. The function of the small fan is just to even out the hot spots.
There is a reason why Nissan has hinted broadly that the leasing is not a bad idea and why Mark Perry has indicated that Nissan knows it has to move to an active thermal management system. Some percentage of these packs will not make it to four years in hot places like Arizona. Cold weather may temporarily compromise cells but hot weather kills them.
But if you're looking at costs, as noted above, Frank Weber has said the Volt's drive train is less expensive than a 100 mile range BEV. So you can take that savings and use if for higher quality BMS system and still have say $7500 to spend. Bose stereo system anyone? Digital radio recorder? Onstar? Better tires? Special sound deadening materials? Higher quality materials? Lots of ways to spend money.