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On 08/19/2014 07:54 PM, Ben Apollonio via EV wrote: > True enough, but if a 200Ah cell fails shorted, it still has 200Ah > to dump all by itself, which is likely to be equally catastrophic. > I think the probability of occurrence is higher with 200 1Ah cells > than with 1 200Ah cell, but the end result is the same. > > On the other hand, if you DO take precautions to isolate the > parallel cells in a fault, you can limit the total energy released > to the amount stored in a single cell (or a handful of small > cells). If I recall correctly, Tesla does this, including > firewalls between modules, which is how they can get away with > using 1000's of cells in a single pack. > > -Ben The eSamba guy is using a piece of "fuse wire" to each cell, so that if a single cell shorts out, the fuse wire blows. I believe the assumption is that the then isolated cell won't be able to start ITSELF on fire if it is not drawing current from all the other parallel cells.... I'm not sure if that is actually the case or not.... Jay -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEARECAAYFAlPz53sACgkQSWJjSgPNbM961wCbB0x2m6wjewcyCkcZw4cWGN1J SW8An374ZGmxqeHKL0SwWPVUNcmoRn+Q =Yxrx -----END PGP SIGNATURE----- _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
