[jjtheblunt]

Warming with blankets only works if the thing is itself emitting heat, to be partially reflected back via the blanket, or emitted more slowly through the blanket than without the blanket.

So how would a frozen car become warmer with a blanket, unless some subsystem within it is emitting energy?

[pengaru]

> So how would a frozen car become warmer with a blanket, unless some subsystem within it is emitting energy?

Probably a reference to the well established practice of using block heaters[0] on diesel engines in cold climates... which AIUI are effectively just electric blankets. It's why you'll often see what appears to be a short extension cord dangling out the front of a big old truck where it snows a lot.

Obviously on an EV you already have much of the parts necessary to generate the heat, esp. if plugged in to charge... so it could just need the blanket/insulation part.

[0] https://en.wikipedia.org/wiki/Block_heater

[AnthonyMouse]

The battery would be emitting energy because you're discharging and recharging it as you drive around.

[buro9]

Under the blankets?

[AnthonyMouse]

Presumably the premise is for the blanket to insulate the battery, i.e. the thing that needs to be warm, not the windshield.

But even once the car is stationary, a blanket would help it retain the heat generated while driving, or generated from charging now that it's plugged in.

[vinni2]

I wonder why EVs don’t have a built in functionality to keep the batteries warm in cold weather. Presumably that would consume a bit of energy to keep batteries functioning in full capacity.

[jjtheblunt]

They do. My BMW does for example.