Cell voltages actually drop after they are fully charged, less so at high rates like the 3C of the in-car equalisation charge of the early prius , charge termination often involves detecting a -delta V. the Ni-mih cells in a Prius often suffer from differential high self discharge currents and get badly out of balance, correcting this involves a 3C charge of a few times the capacity with a lot of heat generated.
-----Original Message----- From: EV [mailto:[email protected]] On Behalf Of Lee Hart via EV Sent: Thursday, 19 June 2014 4:11 a.m. To: Robert Bruninga; Electric Vehicle Discussion List Subject: Re: [EVDL] Exploding cell Robert Bruninga via EV wrote: > Kaboom goes the cell! What kind of charger was being used? Why didn't it notice that the cell voltage was high, and shut down early? Some commercial chargers are amazingly stupid. I have a cordless drill with nimh batteries. Its charger blindly charges for 2 hours and turns off -- regardless of the battery voltage! -- Life is basically simple. You do some stuff. Most fails. Some works. You do more of what works. If it works big, others quickly copy it. Then you do something else. The trick is the doing something else. -- Tom Peters -- Lee Hart's EV projects are at http://www.sunrise-ev.com/LeesEVs.htm _______________________________________________ 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) _______________________________________________ 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)
