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NNTP-Posting-Date: Sun, 14 Apr 2024 20:12:49 +0000
From: John Larkin <jjSNIPlarkin@highNONOlandtechnology.com>
Newsgroups: sci.electronics.design
Subject: Re: lithium explosion
Date: Sun, 14 Apr 2024 13:11:09 -0700
Organization: Highland Tech
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On Sun, 14 Apr 2024 10:10:31 -0700, KevinJ93 <kevin_es@whitedigs.com>
wrote:

>On 4/13/24 9:35 AM, John Larkin wrote:
>> On Sat, 13 Apr 2024 16:14:07 +0100, liz@poppyrecords.invalid.invalid
>....
>> 
>> And a defect sensor would have to constantly snoop every cell of a
>> pack. A typical Tesla might have 7000 cells.
>> 
>
>Tesla (and every other EV manufacturer) does monitor the voltage of 
>every individual cell and every cell has its own fusible link in case it 
>becomes shorted.
>
>kw

Tesla uses many small cell in parallel, numbers like 74. I wonder how
they could monitor the voltage of each cell.

I assume "becomes shorted" means that the battery terminals are
shorted somehow. The bigger hazard is that a cell will short
internally, and all its paralleled friends will then dump thousands of
amps into it.

Monitoring or fusing won't help a 5-second internal ignition from a
separator failure.

I'm certain that few cheap Chinese bike and scooter batteries have any
sort of safety systems. As they age, they may get more dangerous.