Re: lithium explosion

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.