EV <ev-boun...@lists.evdl.org> för Robert Bruninga via EV <ev@lists.evdl.org> den 23 oktober 2018 04:52 Electric Vehicle Discussion List Robert Bruninga [EVDL] Lithium EV battery in colder weather
> I know that Lithium batteries perform worse at lower temps. But what does that mean? > Charging, or using? which is worse. The "rule of thumb": -Avoid any normal/slow charging below zero degrees in cell temp, (I dont know what that is in the degrees of freedom-scale, lets call it "below freezing") That rule also apply to deeply frozen laptops, cellphones and so on... (a sloow trickle charge might be without harm if it is not like deep-space-winter-cold standard chemistry cell, just a bit below freezing or so. But I do not know, probably "it depends"..) Li plating seems real! I think I destroyed a Thundersky, at "only" 0.3C charging test at -28'C * Discharging cold cells seems "ok" , if you do Low C-rates. (May be to run the battery heater for several hours?) The Thundersky 90Ah cells did perform *extremely* poor in my low temp Discharge test. Like -BAM- down to my cut off at 1.8 volt, with a very weak load.. /John -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20181023/8636ae72/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
