Sujet : Re: lithium explosion
De : jjSNIPlarkin (at) *nospam* highNONOlandtechnology.com (John Larkin)
Groupes : sci.electronics.designDate : 14. Apr 2024, 22:11:09
Autres entêtes
Organisation : Highland Tech
Message-ID : <alco1jd4c8vgrl2d7leeorbf98cvs04v1r@4ax.com>
References : 1 2 3 4 5 6 7 8 9 10
User-Agent : Forte Agent 3.1/32.783
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.