Thanks that's very interesting. I believe racing is what pushed ice vehicles as well
Sent from my Verizon Wireless 4G LTE smartphone-------- Original message --------From: Jukka Järvinen <akkuju...@akkujukka.fi> Date: 11/18/2015 7:01 AM (GMT-06:00) To: Paul Dove <dov...@bellsouth.net>, Electric Vehicle Discussion List <ev@lists.evdl.org> Cc: Lee Hart <leeah...@earthlink.net> Subject: Re: [EVDL] A math formula can model li-ion pack aging, Pyrite pack The elevated temperature for Li-ion performance was known method at NEDRA PIR and Wayland invitationals like 10 yrs back. I was there and I kept telling this what we saw in our cell tests back then. Higher death rate too. NMC cells from TS at that time could be preheated with high current charging just before peak load as it drove more li-ions in right places as additional effect. This also killed the cell in a way that you needed to elevate the temperature more on every cycle to get same power out. At normal temperature the cell had become "bad cell" after few cycles. We could now design and make 100C peak cells for dragsters with bi-polar structure and solid stacking. The lessons learned keep pushing the horizon further which we recognize as our technological limit. We are living truly exciting times. -Jukka 2015-11-18 14:17 GMT+02:00 Paul Dove via EV <ev@lists.evdl.org>: I was speaking of performance Sent from my iPad > On Nov 17, 2015, at 3:29 PM, Lee Hart via EV <ev@lists.evdl.org> wrote: > > Michael Ross via EV wrote: >> Years ago, before improvements in testing, that may have been applied to >> "work better," but definitely, high temps are not a recipe for "works >> longer." > > This is true for *all* battery chemistries, as far as I know. Higher > temperatures always increase their amphour capacity (and shorten their life). > > -- > Do the thing that needs to be done, even if no one else yet notices > that it needs doing. -- anonymous > -- > Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at 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/20151118/756ba879/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
