I have seen some of the research on this - if you charge slowly you can avoid any plating. The issue is the electrolyte becomes vicious and the ions pile up on the SEI outside the cathode. What I saw said the problem was at -20C (-4F). But, I am not sure exactly what the cell construction was, and particularly the electrolyte composition. There are umpteen electrolyte recipes and they make a difference. One thin they do is use lower boiling point electrolytes to improve cold performance. If the cell is for a human implant you don't have to worry about it. Lot's of variety.
I think you should heat the pack, and charge as slowly as you can just to be sure. Plating is really bad. Mike On Fri, Feb 20, 2015 at 3:25 PM, Danpatgal via EV <[email protected]> wrote: > Reviving this thread as we're having another very cold stretch here in the > Eastern US. > > My batteries (SE130 CALBs) are still going, but boy do they sag when it's > cold like this. It's annoying. > > I've been charging when my BMS sensors (atop each cell) are over 0C, which > they have generally remained over the past few weeks despite the cold > (thankfully my garage generally stays above 0C). > > But, my follow-up question on all this is if the BMS measurement is good > enough. For example, I guess there is resistive heat that gets generated > upon charge/discharge/shunting that probably make the sensors read higher > than the cells themselves. How much, I don't know. > > Does anybody have any thoughts, experience on this? We've gotten down to > -20C with a HIGH today of only -10C ... yet I'm charging. I didn't really > want to do it, but I was dragging so much on the road with low SOC%, I had > to, or risk having to really limp home. > > > > ----- > Dan Gallagher > http://www.evalbum.com/3854 > > -- > View this message in context: > http://electric-vehicle-discussion-list.413529.n4.nabble.com/Cold-Charging-Lithium-Experiences-tp4667675p4673895.html > Sent from the Electric Vehicle Discussion List mailing list archive at > Nabble.com. > _______________________________________________ > 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) > > -- To invent, you need a good imagination and a pile of junk. Thomas A. Edison <http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> A public-opinion poll is no substitute for thought. *Warren Buffet* Michael E. Ross (919) 550-2430 Land (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone (919) 631-1451 Cell [email protected] <[email protected]> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150220/5c77c4ea/attachment.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)
