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Arizona toddler rescued after getting trapped in a Tesla with a dead battery | The Model Y’s 12-volt battery, which powers things like the doors and windows, died (www.theverge.com)

submitted 5 months ago by [email protected] to c/[email protected]

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[–] [email protected] 10 points 5 months ago (1 children)

Probably would still need the 12V battery to have enough charge to close the connection to the high voltage battery that would power the step down converter.

But yeah it seems dumb to me that most EVs don't keep the 12V battery topped up from the high voltage battery somehow while the car is parked, but I'm not an electrical engineer ¯\_(ツ)_/¯

[–] [email protected] 1 points 5 months ago (2 children)

There really shouldn't need to be a 12V battery at all. Stepping the voltage down isn't that complicated, but the supply chain for the necessary parts aren't there for the car industry.

Plus, it'd be really nice if everything could run off a 48V line instead of 12V. The wires can be thinner due to less current draw. Getting that to work across all the electronics for everything is a whole separate level, though.

[–] [email protected] 2 points 5 months ago

There really shouldn't need to be a 12V battery at all

I think it's mainly there just to be able to control the circuit that cuts power to the high voltage battery off while the car is parked for safety reasons.

[–] [email protected] 2 points 5 months ago (1 children)

You don't want to fully drain the main battery as it would do severe damage to it and most of the 12v system has a phantom draw of power so to keep the main battery from running out they have a separate one

[–] [email protected] 0 points 5 months ago (1 children)

Compared to what the main batt can provide, there's barely any draw from the other electronics.

[–] [email protected] 2 points 5 months ago (1 children)

That's not the point the fact is that there is some dumbass that probably will let it sit at 0% and kill the battery

[–] [email protected] 0 points 5 months ago (1 children)

Battery management electronics don't let you drain lithium batteries to 0%. It's a severe design flaw if it does.

[–] [email protected] 1 points 4 months ago

You still end up with the same problem of no power for locks when it turns off the battery