Some people may also be getting confused with bottom-balancing, which some EV builders do. But that is only done one time, at the start of putting together a battery pack, and typically of used cells, to get them to duscharge to be fairly balanced at the end of driving. But this is not the technique of IEMs if they don't want to damage the pack
-Ed Thorpe On Tue, Jul 2, 2019, 6:18 AM Peri Hartman via EV <[email protected]> wrote: > What would be cool is if the EVSE had a "recalibrate" mode where it > first fed power back to the grid and then recharged the EV. > > ------ Original Message ------ > From: "Peri Hartman" <[email protected]> > To: "Electric Vehicle Discussion List" <[email protected]> > Sent: 02-Jul-19 6:17:13 AM > Subject: Re[2]: [EVDL] balancing: ?PD.lu purposely maintenance-drain > Tesla-S pack every 20, 000km? > > >Ah, that makes more sense. Thus, every time I fully charge, I am > balancing the cells. That's what I've been assuming. > > > >To calculate the Wh, though, does one really have to fully discharge ? I > guess, no matter how accurately it can measure current out of and current > into the battery, cumulative errors will appear. But fully discharging an > EV battery is difficult ! How do you do it - leave it in the driveway with > the heater running full ? > > > >Peri > > > >------ Original Message ------ > >From: "paul dove via EV" <[email protected]> > >To: [email protected] > >Cc: "paul dove" <[email protected]>; "brucedp5" <[email protected]> > >Sent: 01-Jul-19 8:24:42 AM > >Subject: Re: [EVDL] balancing: ?PD.lu purposely maintenance-drain Tesla-S > pack every 20, 000km? > > > >>I think people get confused with the term balancing. It is pretty much a > carry over from lead acid batteries where the take all the cells to boiling > to get them to the same voltage at the end of charge. It doesn't apply to > Lithium since this is derogatory to cell life. > >>I believe what people are experiencing is the algorithm built into the > system that keeps up with capacity from all the data, current, voltage, > sag, internal resistance, temperature........ after a while of short > discharges and charges the capacity value can get off from actual battery > capacity and it gets corrected when you do a deeper discharge. > >>If any balancing is going on it happens every time you charge... most > likely or when close to fully charged. Maybe some guys who actual take cell > data can shed some light on this but I don't think this is affecting > capacity much. > >> > >> > >> On Saturday, June 29, 2019, 5:44:55 PM CDT, brucedp5 via EV < > [email protected]> wrote: > >> > >> It took some digging, but I found a EVLN post I made back in Aug 2015 > that > >>might shed some light on this topic, see > >> > >> > http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVLN-Offset-Supercharging-degradation-with-pack-balancing-tp4677028.html > >> ... Lost capacity may be restored by “balancing the pack”—that is, > charging > >>it to 100 percent to make sure that each of the cells is fully topped > off. > >> > >>Tesla, of course, is mum on the subject; I’ve never seen any official > word > >>on pack balancing, and the company officially recommends against > charging to > >>100 percent unless maximum range is necessary. > >> > >>The Model S fan site Teslarati, however, recommends charging the pack to > >>100 percent every three months or so. > >> > >>When I asked at my local Tesla Service Center about “pack balancing”, I > was > >>told they did it all the time. > >> > >>“Discharge it as close as you can to zero, and then charge it as slow as > >>possible all the way up to 100 percent,” I was told. “You’ll probably get > >>some capacity back.” > >> > >>It works! > >> ... > >> > >> and comments on this topic are shown on: > >> > http://electric-vehicle-discussion-list.413529.n4.nabble.com/template/NamlServlet.jtp?macro=search_page&node=413529&query=tesla+pack+balancing&days=0 > >> > >> > >> > >> > >>For EVLN EV-newswire posts use: > >> http://evdl.org/archive/ > >> > >> > >>{brucedp.neocities.org} > >> > >>-- > >>Sent from: http://electric-vehicle-discussion-list.413529.n4.nabble.com/ > >>_______________________________________________ > >>UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > >>http://lists.evdl.org/listinfo.cgi/ev-evdl.org > >>Please discuss EV drag racing at NEDRA ( > http://groups.yahoo.com/group/NEDRA) > >> > >> > >>-------------- next part -------------- > >>An HTML attachment was scrubbed... > >>URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20190701/981a8381/attachment.html > > > >>_______________________________________________ > >>UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > >>http://lists.evdl.org/listinfo.cgi/ev-evdl.org > >>Please discuss EV drag racing at 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 > Please discuss EV drag racing at NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- An HTML attachment was scrubbed... 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