Peri Hartman via EV wrote:
Ok, so the correct assumption would be that the Leaf and Bolt cells don't have enough internal resistance, thus the performance stays poor in cold weather ?
Let me try to simplify it. There are huge differences between the various types of lithium cell constructions and chemistries. Don't assume that the same rules apply to all of them. It's like assuming that all dogs are alike. They may all be dogs; but there are vast differences between them!
The old Thundersky cells had very high internal resistance; more than 10 times higher than modern cells. Since the resistance was so high, it was a more effective "heater". They also had a very thick plastic case, which insulated and trapped the heat. So Cedric's trick worked.
It won't work for modern low-resistance cells with good cooling. Loading a cold cell with high current will cause a little heating (which helps). But it will also cause significant damage from side effects. The normal chemical reactions can't supply the current due to the cold; so this forces side reactions to take place, damaging the cell.
Lee Hart -- There is a computer disease that anybody who works with computers knows about. It's very serious, and interferes completely with your work. The trouble with computers is that you 'play' with them! (Richard Feynman) -- Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
