"Hmm, But the problem with these cells seems to be a very short life at elevated temperatures "
Yes, that does seem to have been over looked, and the fact that it is possible to know more and do better. I am sure we can argue about 3000 cycles not being short. And someone mentioned some 50°C temperatures, but what they put in the specs is what they they put in the specs. With the good testing now possible, a lot more can be known. Buying on faith sucks. I think someone wanting to buy Li ion cells right now would be in pretty much the same information-limited position no matter where they went to get supplies. People like LG, and Panasonic might have it now, but it hasn't filtered out to little guy DIYer. Same old, same old on the websites. I think people should be asking everyone they get a quote from, if they have had an HPC study underway and what are the results? Mike On Wed, Apr 1, 2015 at 4:06 AM, Hoegberg via EV <[email protected]> wrote: > > > ---------------------------------------- > > Date: Mon, 30 Mar 2015 14:00:00 +0000 > > To: [email protected] > > Subject: Re: [EVDL] ENERDEL Battery Experiences > > From: [email protected] > > > > Hello Michael, > > Some companies do not pay a lot of attention to their website and rely > on their marketing department. EnerDel is an OEM supplier and I suspect > not interested in attracting hobbyists via the internet. > > The product, cell to complete battery systems, is made in the Indiana > facilities. There were 2 plants operating when I toured last, about 2 > years ago. One place made the cells starting with slurry mix. They were > transferred to the other plant to complete formation and packaging or > assembly into modules. They are LiNMC chemistry. They make one basic cell > there in several varieties. > > The pdf you linked shows 2 cell varieties. The CE175-360 is 17.5Ah and > indicated at 2500 cycles to 80%. The CP160-365 is 16Ah and indicated at > 3000 cycles to 85%. I believe the test procedures can be found by > searching for USCAR Advanced Battery Consortium. > > Jeff M > > > Hmm, > > But the problem with these cells seems to be a very short life at elevated > temperatures > It would be VERY interesting to look at a test from cells in the IEC 61427 > evaluation (with voltages adjusted for the Li-chemistry) > > Especially the phase B part might give these cells even a shorter life > than Lead Acids?? > > "The complete test (cycles and capacity testing) is performed under > elevated temperature (+40 °C ± 3 °C) " > > "Phase B, shallow cycling at high stage of charge” > 100 cycles discharge with current = 1,25 * I 10 [A] for 2h > recharge with current = I 10 [A] for 6h > > capacity test: discharge with current = I 10 [A] final voltage = 1.80Vpc > recharge to fully charged condition > > http://www.trojanbattery.com/pdf/RE_IEC61427_Premium.pdf > http://www.battcon.com/PapersFinal2009/BruhlPaper2009FINAL_17.pdf > > > > Enerdel; > please look at the cycle test i graph at the last page > It says c/2 , so it is 2 hours up, + 2 hours down for each cycle(?) > > http://www.enerdel.com/wp-content/uploads/2013/11/Cell-Binder.pdf > > So I guess that will be a total of 4hours time for each cycle (right?), > and about 6 months only in total at this elevated temperature, > and not long time was spent at SOC = "full" then. Right? > > the graph indicates just 1000, at 45 degrees. > but combine that with TIME.. > and closer to normal/ full SOC, > > The graph in the lower right side also indicate only > 6 Years life(?) at only 30 degrees cell temp, and that was at low 75% > SOC.. :-/ > > > > > / John > > > > _______________________________________________ > 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 [email protected] <[email protected]> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150401/1e8d412c/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)
