On Thu, 17 Jan 2013, Lee Hart wrote: > Sony got "burned" by the LiCo batteries because they didn't know they > could burn so dramatically. After all, no previous battery technology > (lead-acid, nicad, nimh) could burn like that. As I recall, there were > quality control problems in the cells that could cause internal shorts, > which started the fires.
I thought the fires were caused by a protection circuit inside the cell. When the operating conditions (temperature of, voltage accross, or current through the cell) exceeded specifications, the protection circuit would open, disconnecting the battery. The computer designers exceeded the specifications of the batteries by creating long series chains (3 or 4) cells. When the protection circuit decided to protect the cell, the higher voltage caused an arc inside the cell which started the fire. Ed _______________________________________________ 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)
