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
> > _______________________________________________
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> > Please discuss EV drag racing at NEDRA (
> http://groups.yahoo.com/group/NEDRA)
> >
> _______________________________________________
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>
>
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