I am thinking the wide availability of the Leaf packs at a reasonable cost from local wrecking yards is a major driver. Plus. Wrecking yards usually will deliver it for free :-)
On Friday, December 23, 2016, tomw via EV <[email protected]> wrote: > May I ask why the two of you (John, Cor) decided to use Leaf packs rather > than Volt packs? The spinel chemistry used in Leaf batteries is known to > be > inferior to the NMC chemistry which I think is used in Volt packs, and the > Volt packs have liquid temperature control to further improve longevity. On > the other hand, the Leaf modules seem to be much easier to work with if you > want to make a custom pack, say by combining the basic 2s2p modules in > parallel to make higher Ah modules, or to fit an existing battery box in a > conversion. > > Then there are also Tesla S modules available which seem to be the best > chemistry for longevity and the highest energy density. Some are concerned > with the safety of these higher energy density cells, but the Tesla packs > seem very well designed for safety with each cell fused on both anode and > cathode, and my understanding is you have access to the bms wires from each > module so can straight-forwardly connect a bms to them. > > Just wondering what drove your decision. I've toyed with the idea of using > one of the above in my conversion for a couple years now, but my LiFePO4 > pack, though 7 years old, is still doing fine so I'm reticent to spend more > money on batteries, and I'd kind of like to see how long it lasts before > significant degradation. I lean more toward Tesla modules since I could > double my pack size and have a bit LESS weight, and I think with proper > care > in the implementation, packaging, and operation (bms) they would be safe. > > I also prefer liquid cooling since I think the end of life of my cells will > be caused by creeping up internal resistance, not capacity loss. We get > fairly high temperatures here in July and August (~100F, sometimes above) > so > the higher internal resistance will result in more pack heating and pack > temperatures exceeding the ~40C (104F) limit above which it seems that > greater deterioration occurs. I've exceeded that a few times, and expect it > will get more frequent as ir creeps up. > > -- > View this message in context: http://electric-vehicle- > discussion-list.413529.n4.nabble.com/Leaf-battery-pack- > connector-tp4684927p4685015.html > Sent from the Electric Vehicle Discussion List mailing list archive at > Nabble.com. > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > 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/20161227/f86df11f/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
