Technology

59381 readers

2601 users here now

This is a most excellent place for technology news and articles.

Our Rules

Follow the lemmy.world rules.
Only tech related content.
Be excellent to each another!
Mod approved content bots can post up to 10 articles per day.
Threads asking for personal tech support may be deleted.
Politics threads may be removed.
No memes allowed as posts, OK to post as comments.
Only approved bots from the list below, to ask if your bot can be added please contact us.
Check for duplicates before posting, duplicates may be removed

Approved Bots

founded 1 year ago

MODERATORS

682

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 4 months ago by ForgottenFlux@lemmy.world to c/technology@lemmy.world

300 comments fedilink hide all child comments

you are viewing a single comment's thread
view the rest of the comments

[–] ramenshaman@lemmy.world 9 points 4 months ago (1 children)

Really interesting design decision. Was the main battery also dead? I'm guessing not. There's a step-down converter under the rear seat that outputs 12-16 volts, Tesla could probably have fairly easily set the car up to power the doors from that when the auxiliary 12V battery dies.

[–] Venator@lemmy.nz 10 points 4 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)_/¯

[–] frezik@midwest.social 1 points 4 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.

[–] Venator@lemmy.nz 2 points 4 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.

[–] histic@lemmy.dbzer0.com 2 points 4 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

[–] frezik@midwest.social 0 points 4 months ago (1 children)

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

[–] histic@lemmy.dbzer0.com 2 points 4 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

[–] frezik@midwest.social 0 points 4 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.

[–] histic@lemmy.dbzer0.com 1 points 4 months ago

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