Re: [EVDL] Lithium EV battery in colder weather

2018-10-24 Thread Michael Ross via EV
I am not sure about which cells are better or worse, but there are cells which have problems with the Li plating onto the graphite electrode if there is too much current at lower temps. This clogs the electrode so less and less can be intercalated quickly. Lots of interesting literature in this se

Re: [EVDL] Lithium EV battery in colder weather

2018-10-23 Thread Michael Ross via EV
018 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 "r

Re: [EVDL] Lithium EV battery in colder weather

2018-10-23 Thread Hoegberg via EV
EV för Robert Bruninga via EV 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 &q

Re: [EVDL] Lithium EV battery in colder weather

2018-10-23 Thread Hoegberg via EV
EV för Robert Bruninga via EV 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. In g

Re: [EVDL] Lithium EV battery in colder weather

2018-10-23 Thread Lee Hart via EV
Jay Summet via EV wrote: Note that using a battery (both charging and discharging) will heat the battery because of the waste heat loss inherent in the inefficiencies of the charging/discharging process. That's true. But the efficiency of good EV cells is high (95% or more) that very little wa

Re: [EVDL] Lithium EV battery in colder weather

2018-10-23 Thread Jay Summet via EV
On 10/23/18 11:21 AM, Lee Hart via EV wrote: If capacity and performance in cold weather are important, that means providing some way to insulate and heat the battery to keep it up to operating temperature. Note that using a battery (both charging and discharging) will heat the battery be

Re: [EVDL] Lithium EV battery in colder weather

2018-10-23 Thread Lee Hart via EV
Robert Bruninga via EV wrote: I know that Lithium batteries perform worse at lower temps. But what does that mean? Charging, or using? which is worse. Does cold prevent the battery from accepting a given capacity, or does cold prevent one from using a given capacity that is already in the batter

[EVDL] Lithium EV battery in colder weather

2018-10-22 Thread Robert Bruninga via EV
I know that Lithium batteries perform worse at lower temps. But what does that mean? Charging, or using? which is worse. For example, in the winter, is it better to charge in the evening when I come home and battery is warmer or to put it into charge-by-7AM mode and have it charge the battry wh