Heat is the enemy, and quick charges mean heat. You can't stroke to broadly here, not all chemistries and constructions are the same. LiFePO4 can take a charging differently than others, for example. Nissan also makes their own batteries. You can't assume you know what is one, and you can't guess by other means what they are using, unless you start disassembling a bunch to see.
BM On Thu, Nov 14, 2013 at 10:55 AM, Peri Hartman <[email protected]> wrote: > But even if the battery can take a high regen current, is it good for it > long term? For example, Nissan recommends not to quick-charge too often. > With a relatively small number of super caps, the regen spike could be > distributed and recharge the battery more gently. Would that be better? > > Peri > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf > Of Willie2 > Sent: 14 November, 2013 7:42 AM > To: Electric Vehicle Discussion List > Subject: Re: [EVDL] EVLN: Graphene Supercapacitors Ready For EVs > > On 11/13/2013 11:25 AM, EVDL Administrator wrote: > > On 13 Nov 2013 at 3:33, brucedp5 wrote: > > > >> Conventional batteries take so long to charge that they cannot > efficiently > >> store braking energy. > > Hold on there! A lead-acid battery can be charged at thousands of amps > if > > it's below 80% SOC. > > > > To view it from another angle, a battery can usually charge as fast as it > > can discharge. I'm sure there are exceptions, but in my experience, most > > drivers seldom decelerate dramatically faster than they accelerate. > > > > That said, supercaps have been shown to be useful in mitigating peak > > currents on discharging, and maybe this would help too on charging. But > I > > suspect that further battery refinement - and the extra cost of the caps > - > > will make this a moot point. > > I also noticed the poor quality of the article also and intended to > comment on it at the time. > > I guess he is thinking of not BEVs but hybrids with relatively small > batteries. > > As far as I know, ALL BEVs with regen capture an acceptable amount of > braking energy. A Tesla S (warm with a not full battery) can regen at > 60kw; that covers probably more than 90% of braking needs. I have no > personal experience, but I suspect even the small battery in a Volt > allows an acceptable job of regen. > > > > _______________________________________________ > 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) > > > > _______________________________________________ > 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) > > -- Put this question to yourself: should I use everyone else to attain happiness, or should I help others gain happiness? *Dalai Lama * Tell me what it is you plan to do WIth your one wild and precious life? Mary Oliver, "The summer day." To invent, you need a good imagination and a pile of junk. Thomas A. Edison<http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> A public-opinion poll is no substitute for thought. *Warren Buffet* Michael E. Ross (919) 550-2430 Land (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone (919) 631-1451 Cell (919) 513-0418 Desk [email protected] <[email protected]> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131114/de907f45/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)
