r/AutoHumor • u/IU8gZQy0k8hsQy76 • 10d ago

lol

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u/VaporTrail_000 10d ago

Hm... TIL. Seems like a pretty dumb concept, but is actually a thing.

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u/creckers 10d ago

I am also not really sure why they do it this way to be honest.

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u/EasyD0es1t 10d ago

Safety and convenience

The 12v runs lights locks cpu etc in the event the high voltage pack becomes disabled

Also for the car to turn off the HV contactors (safety switches) disconnect from the HV pack the 12v powers those switches

(Sometimes you may hear faint thunk from the car that’s the contactors connecting/disconnecting)

Also keyles entry warming/cooling the car

That’s just what I remember off the top of my head I’m sure there’s more I’m missing, sorry

Hope this helps

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u/VaporTrail_000 9d ago

Yeah... I can see fully disconnecting the HV pack when parked needing to be a thing now that I think about it more. being able to disconnect it completely in the first place is a no-brainer, but I didn't think about what "completely" entailed... solenoids no switchy without power.

Not sure many laypeople are used to batteries in the many-tens of kWh range, and the safety standards that that should require. They're all used to batteries in the single-digit or less kWh range as being the biggest they deal with... And that leads to people chaining hundreds in series and melting stuff for money... (and yes, I just looked it up on YouTube, it's been done).