What I saw Rickard talk about was packs of somewhat uncertain provenance - the Israeli Better Place packs weren't they? He sort of knew when the got shelved before he bought them and inferred capacity fade from how they seemed to him after delivery. And he also had a bath of charged CALB cells he shelved. I guess he knew pretty much about the CALB cells. I think he said capacity dropped about 1% a year. It is worth asking, what happened between when the cells were made when and they landed in Missouri? A scientific study would require some traceability.
I didn't hear JR say they self discharged, but that could be memory fade. He might have known the SOC of the CALBs at t=0. But he probably had to measure voltage (not reliable perhaps), and again I am not admitting the capacity decreases were due to self discharge. They may look the same but they are not. Self discharge would be where the capacity has not decreased, but the amount available in the cell is less - very hard to measure accurately the actual charge level with normal DIY instrumentation when the change is small. On Fri, Jun 19, 2015 at 5:28 PM, Paul Dove via EV <[email protected]> wrote: > I haven't seen any science from BMS advocates yet. They make lots of > assumptions based on nothing. > > Besides I have a BMS I just don't have a cell level BMS. > > I haven't heard the theory on self discharge yet? > > Or the rate at which they discharge or an example of someone putting one > on the shelf for 5 years then measuring the voltage and capacity. Save for > Jack Richard who boldly did it and published a video. > > I read a lot of papers and I only found one that talks about self > discharge although I don't agree with the way they use the term because > what they really verify in the paper is capacity fade. > > -- 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/20150619/e8440f4a/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)
