General > General Technical Chat
Why do they make EV batteries round instead of flat sheets?
Berni:
--- 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.
--- End quote ---
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.
floobydust:
Spiral plate technology has been around for decades in lead-acid gel cells. Quoted advantages are higher surface area, closer plate spacing, lower ESR due to the plate's interconnects, better quality control of plate thickness (pasting made as a continuous cast strip), better vibration resistance.
Hawker Gates/EnerSys Cyclon and Optima are examples. US Patent 4,606,982
S. Petrukhin:
--- 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.
--- End quote ---
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.
--- End quote ---
And how much energy will then be consumed from the battery to heat the cabin? And in the summer, the air conditioner is battery-powered... :)
SVFeingold:
--- Quote from: wraper on January 08, 2021, 02:23:55 am ---You are completely wrong. S/X uses the same principle. But there is no flame extinguishing compound. Nor your claim about battery cooling performance bears any truth. If anything, motor temperature is limiting sustained speed. Taycans' better performance at high speeds comes from 2 gears and the fact it's not a family car.
--- End quote ---
Yes I got the wires crossed a bit. The powerwall uses the flat plate cooling system, not the S/X. 3/Y modules are potted. S/X are not. S and X both use similar bandolier styles to the 3/Y, except that each module in the former has a single cooling loop that spirals its way through the module. The 3/Y use multiple bandoliers per module so the coolant only has to pass through the module once, end-to-end, instead of multiple times as with the S/X.
Which yes, is a much more effective cooling system. There's really no argument on which module system has better cooling. As far as the Taycan is concerned, there is likewise no argument about which cools better, and not because of the transmission. The Taycan can do multiple full-power hard launches, back-to-back, without any thermal throttling of the battery/motor. The 3 and Y cannot. As for the S it's pretty well known how rapidly the performance is impacted due to overheating. Far as family cars go, whatever floats your boat. They're both 4 seaters with a trunk.
wraper:
--- Quote from: SVFeingold on January 08, 2021, 05:09:24 pm ---Which yes, is a much more effective cooling system. There's really no argument on which module system has better cooling.
--- End quote ---
Don't forget that 18650 cells are thinner = easier to cool.
--- Quote ---As far as the Taycan is concerned, there is likewise no argument about which cools better, and not because of the transmission. The Taycan can do multiple full-power hard launches, back-to-back, without any thermal throttling of the battery/motor. The 3 and Y cannot.
--- End quote ---
Model S is 5 seater. And not for gnomes on the rear seats.
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