General > General Technical Chat
Why do they make EV batteries round instead of flat sheets?
SVFeingold:
--- Quote from: wraper on January 08, 2021, 06:40:51 pm ---Model S is 5 seater. And not for gnomes on the rear seats.
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But kids are gnome-sized. ;D
The 18650s would be slightly easier to cool but it still doesn't make up for the inferior cooling system of the S vs. the newer modules in the 3/Y. I have no doubt the new Roadrunner cell packs will cool even better than the 2170s despite being much larger. Time will tell on that one.
Red Squirrel:
--- Quote from: Berni on January 08, 2021, 06:07:22 am ---
--- Quote from: Red Squirrel on January 08, 2021, 03:42:06 am ---Speaking of coolant, do they also pump heat through the cells for charging? Ex: can you charge an EV in -40 outside? Not everyone has a usable garage to park a car in so ideally they need to be designed so you can charge them while outside, I would hope at least.
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Yep they do have heating elements for the battery for that reason.
Only problem is that when changing from a regular extension cord the heaters take so much power that barely any power is left for actually changing the batteries. So the car becomes a glorified outdoor heater.
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That's good to know. I'd hate to find out that you can't charge at all in cold weather, or worse, damage the battery. But yeah I imagine it will be less efficient due to needing to keep the battery heated. You'd probably want to be on a 240v outlet for charging outside. A faster charge rate may also be better since the time spent keeping the battery warm is shorter so you use less power overall. As long as the BMS is smart enough to still regulate charge based on temperature during the initial charge as it probably takes a while for the entire cells to come up to temp even if temp sensor says it's safe to charge. I'd like to think the engineers have all of this figured out.
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