Cars - For Car Enthusiasts

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

submitted 1 year ago by Monero to c/cars

7 comments fedilink hide all child comments

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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[–] [email protected] 24 points 1 year ago (1 children)

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.

[–] [email protected] 12 points 1 year ago (1 children)

to piggyback off this, 12V components are also everywhere else, so you can use off the shelf components like lights, wiper motors, etc without having a limited production run for high voltage components, which keeps costs down. Doing it this way made it possible to add hybrid systems to traditional vehicles like a camery or an escape. This also enables you to jumpstart a hybrid with another 12V system.

TLDR: money, compatibility, safety

[–] pHr34kY 5 points 1 year ago (1 children)

I think James May explained it best when the whole thing failed on his car and he couldn't even get into it.

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

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