On 03/21/2013 07:24 AM, Mark Hanson wrote:
I know lead is well known nut I'm still leraining about Lithium batteries. Recently there was a VA-Tech seminar on LiFePO4 batteries and Manganese-Lithiums used in the Nissan leaf. The professor said not to charge them above 80% or below 20%. I understand the bottom part, I try not to go below 80% DOD but I fully charge 2X a day to close to 100%. I would think that limiting a 100ah battery to 60ah would be a severe limitation. Why would fully charging a lithium battery cause degredation?
It doesn't, but overcharging, by even a small amount, does cause damage. And because the line between fully charged and overcharged is so small, it's recommended you leave a good safety margin. I guess one could argue 20% is too much and maybe 10% is ok. I think actually going to 100% requires a very good and very responsive BMS to make sure you never overcharge any of your cells.
--Rick _______________________________________________ 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)
