To debate with people about the necessity of thermal encapsulation of batteries. I bring the deal to very simple level so the receiver really takes the analogy.
*Li-ion batteries have organic electrolyte. People are organic too. So would you survive without clothes in the -20C?* Ok. One must have some personal experience in that cold. Then it makes some sense. Cell phone is one simple example. Keep it in the outer pocket of you jacket and after some time in -25C it's dead. Keep it by the body at the lower cloth levels and it'll work just fine. We could make cells that operate in very cold but they would die fast when the water becomes liquid again. And vice versa. -Jukka p.s.- It's -12C out and the battery pack is +5C. http://www.google.com/profiles/jarviju#about 2014-01-30 EVDL Administrator <[email protected]> > I was chatting with someone today about this. He tried to make it an "aha" > moment, as in "Aha! See how impractical EVs are!" I pointed out that > equivalent or similar cold weather accomodations exist for ICEVs, it's just > that he's used to them and/or they're invisible to him. For example, fuel > (especially Diesel fuel) is formulated differently in cold weather. And > some far-north states and countries need block heaters - to keep their ICEs > warm with electricty, so they'll start with electricity! > > In a properly designed EV, cold worries shouldn't be a big deal. The EV's > battery should have thermal management, maybe even a heater for extremely > cold weather operation. > > In fact I would argue that EV battery thermal managemetn is elementary > compared to the complex, computer controlled millisecond-by-millisecond > adjustment of fuel mixture, spark timing, and even valve timing in ICEVs. > Every ICEV driver takes that stuff for granted now, but in the days of the > Model T and its ilk, all those adjustments had to be made on the fly by the > driver. > > By the time I was aware of Things Automotive, spark advance was handled by > centrifugal and vacuum devices. However, I'm old enough to remember (and > to > have used) manual chokes. > > One day you young whippersnappers will get to say something similar. "I > remember when you had to check your EV's battery temperature before > charging. Can you believe it? In fact, in my first EV, I actually had to > put WATER in the batteries once a month." > > David Roden > EVDL Administrator > http://www.evdl.org/ > > > _______________________________________________ > 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) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140130/a3e18738/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)
