That's 300 mA at 250 VDC. And it proves exactly what the literature says, You CANNOT trickle charge a NiMh cells beyond 100% and the same holds for Lithium. They overpressure and explode or vent or whatever it takes to relieve the pressure...
This is completely different from our 60 year experience with NiCd's which can ALWAYS be trickle charged indefinitely at 0.1C trickle charge. *not so* with NiMh and Lithiums.. Bob -----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Jan Steinman via EV Sent: Wednesday, April 01, 2015 5:37 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] Temperature rating (and Blowing them up!) > From: Robert Bruninga via EV <ev@lists.evdl.org> > > Same happens with NiMh: See my blown up Prius cells... All I did was p ut a 300 mA trickle on them... and then forgot about it. > Until 8 hours later when they began to explode... Wow, Bob. That is difficult to understand. Across one cell, there should only 360 milliwatts, which a half-watt resistor can safely dissipate! Even if a cell were shorted, the wiring to it could probably dissipate 300 mA without melting. Are you absolutely certain your charger didn't go bonkers on you? It's hard to reconcile 300 mA with the sort of damage pictured. :::: The problems of energy use are not technical but cultural. Americans want speed, acceleration and big cars. -- Pat Murphy :::: Jan Steinman, EcoReality Co-op :::: _______________________________________________ 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)
