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Jack may need some adult supervision...

GSP

Member
Dec 28, 2007
2,574
802
Glad no one was hurt.

Overcharging a Lithum battery should not be possible, IF the proper precautions are taken. Every battery should have a BMS and seperate contactors for HV positive and negative. The BMS should be designed so that the contactors open before any cell gets overcharged. The design needs to insure this will happen even when there is any failure in the BMS, wiring, or contactors.

This basic engineering is in every factory EV, and it should be in all conversion EVs as well.

Of course, we don't always have things as they "should" be, but this situation could be fixed.

GSP
 

dhrivnak

Active Member
Jan 8, 2011
4,454
3,698
NE Tennessee
Glad no one was hurt.

Overcharging a Lithum battery should not be possible, IF the proper precautions are taken. Every battery should have a BMS and seperate contactors for HV positive and negative. The BMS should be designed so that the contactors open before any cell gets overcharged. The design needs to insure this will happen even when there is any failure in the BMS, wiring, or contactors.

I wish things were that simple, as I have seen several cells fail one almost dangerously, as it half melted, due to BMS failures. So yes maybe with the right BMS, but there is junk out there and some of that junk is the BMS itself.
 

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