Yep. They hired the guy that developed high precision coulometry to be the engineer in charge of cell life.
On Sat, Mar 28, 2015 at 6:37 PM, Mike Nickerson <m...@nickersonranch.com> wrote: > Tesla seems to realize that too. You can adjust the end charge point. > For daily use, they recommend a range that looks like it is about 50-80%. > > On March 28, 2015 3:39:15 PM MDT, Michael Ross via EV <ev@lists.evdl.org> > wrote: > >Yes. That is pretty much what the best scientists working on it say. > >Keeping it from getting too hot (which may not be all that hot, and I > >have > >not read anything that tells what temperature or other thermal history > >is > >implicated) when fully charged should eliminate the degradation caused > >by > >the reactive, delithiated positive electrode from tearing up the > >electrolyte. > > > >You CAN control how much of a charge you put on it, and you CAN simply > >make > >sure you run some of the charge off right away. This is bound to > >improve > >matters. $10k and a some Leaf cells and you might get a study done to > >sort > >it out better. Rank speculation: NIssan probably won't fund it, or > >reveal > >if that have - they simple made the problem go away by some needed > >modifications to the pack. > > > >There are other potential problems, but this is what has messed up the > >Leafs in places like AZ according to Jeff Dahn. > > > >On Sat, Mar 28, 2015 at 5:10 PM, Cor van de Water via EV > ><ev@lists.evdl.org> > >wrote: > > > >> So - in a sense the availability of QC could improve the Leaf's pack > >life > >> if you only charge to 80-ish percent SoC and rely more on QC to > >complete > >> the trips that you otherwise would have needed a full charge for? > >> > >> Cor van de Water > >> Chief Scientist > >> Proxim Wireless Corporation http://www.proxim.com > >> Email: cwa...@proxim.com Private: http://www.cvandewater.info > >> Skype: cor_van_de_water XoIP: +31877841130 > >> Tel: +1 408 383 7626 Tel: +91 (040)23117400 x203 > >> > >> > >> > >> -----Original Message----- > >> From: EV on behalf of Michael Ross via EV > >> Sent: Sat 3/28/2015 10:53 AM > >> To: David Rees; Electric Vehicle Discussion List > >> Subject: Re: [EVDL] EVLN: LEAF EV Pack Reliability Outperforms Cynics > >& > >> Critics (?) > >> > >> Yes, the rate of charge is not a problem, it is being fully charged > >AND too > >> hot. > >> > >> https://www.youtube.com/watch?v=pxP0Cu00sZs > >> > >> On Sat, Mar 28, 2015 at 2:06 AM, David Rees via EV > ><ev@lists.evdl.org> > >> wrote: > >> > >> > On Fri, Mar 27, 2015 at 5:43 AM, Paul Dove via EV > ><ev@lists.evdl.org> > >> > wrote: > >> > > Well that just verifies what I said. You have no data other than > >coming > >> > from > >> > > the Leaf instruments. If it calculates capacity incorrectly it > >will > >> shut > >> > down the car. > >> > > You still don't know if the battery failed or the capacity > >measurement > >> > is off. > >> > > One would have to measure voltage and amp hours to really know > >what is > >> > happening > >> > > >> > It's pretty easy to verify pack voltage using LeafSpy or LeafDD or > >> > similar tools. I've verified that my LEAF is down close to 25% > >after > >> > almost 4 years and almost 40k miles in southern California. > >> > > >> > That said, the INL (Idaho National Laboratory) tested four 2012 > >LEAFs > >> > in Arizona over a period of about 2 years and 50,000 miles - two > >were > >> > only charged on L2, the other two were only charged using DC QC. > >> > > >> > http://avt.inl.gov/fsev.shtml > >> > http://avt.inl.gov/pdf/energystorage/DCFC_Study_FactSheet_50k.pdf > >> > > >> > Battery capacity was verified by pulling the packs and measuring > >> > capacity using a defined test protocol. > >> > > >> > While the DC QC cars fared slightly worse, at the end of 50k miles > >the > >> > L2 charged cars had lost almost 25% of their capacity and the QCed > >> > cars lost about 27% of their capacity. > >> > > >> > So yeah - the 2011-2012 LEAFs definitely lose capacity fast, > >> > especially in hot climates. The good news is that frequent QC > >doesn't > >> > appear to significantly change your rate of capacity loss unless > >you > >> > use QC nearly exclusively. > >> > > >> > -Dave > >> > _______________________________________________ > >> > 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) > >> > > >> > > >> > >> > >> -- > >> 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) 585-6737 Land > >> (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google > >> Phone > >> (919) 631-1451 Cell > >> > >> michael.e.r...@gmail.com > >> <michael.e.r...@gmail.com> > >> -------------- next part -------------- > >> An HTML attachment was scrubbed... > >> URL: < > >> > > > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150328/6b95d1a1/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) > >> > >> > >> > >> -------------- next part -------------- > >> A non-text attachment was scrubbed... > >> Name: not available > >> Type: application/ms-tnef > >> Size: 5231 bytes > >> Desc: not available > >> URL: < > >> > > > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150328/65acdebd/attachment.bin > >> > > >> _______________________________________________ > >> 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) > >> > >> > > -- 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) 585-6737 Land (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone (919) 631-1451 Cell michael.e.r...@gmail.com <michael.e.r...@gmail.com> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150328/093cad75/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)
