Why do even hybrid cars have 2 batteries?(12v + high-voltage) (lemmy.world)

submitted 1 year ago by Monero@lemmy.world to c/cars@lemmy.world

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It feels kind if dumb to see such configuration and I have worries If I drain small 12v battery by using car with engine off It wouldn't start..

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[-] deliux@discuss.tchncs.de 1 points 1 year ago

The main reason why you will alway have a low voltage battery is safety: It is used to actuate the contactors for the HV Battery. You would not want un-switchable HV components. For example in the event of a crash the HV battery gets completely disconnected but airbags and indicators will still work. The 12v battery will get charged off the main hv battery if it gets low btw.

this post was submitted on 10 Sep 2023

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