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I don't know what the max temp on batteries is, but 80-100F is pretty much ideal according to people at the local EV club, I would put some reflective insulation on the top to keep the heat off of them but leave an air gap, you can also install a solar panel and either hook it to a fan to blow air around them, or hook it to the vent fan of the car to bring cool air in while it's parked.
My understanding is that the heat generated by charging is not that much, that a 300watt heating pad left on for 2-3 hours will get the batteries up to temp on a 20 degree day but that charging them doesn't do that much, using them on the other hand will create a bit of heat.
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