You might want to rethink that theory. https://www.princeton.edu/~spikelab/papers/103.pdf
Sent from my iPhone > On Sep 3, 2016, at 3:20 PM, Cor van de Water via EV <[email protected]> wrote: > > Paul, > Every time the cell is at the top of charge, it will expand. > Don't compress and you will likely burst it in short order. > I have taken apart packs that were used *with* the Leaf BMS > so charging has always kept them under 4.115V max but when I remove > the nuts that hold a stack in compression, I cannot get the nuts back on > unless I use heavy clamps to compress the stack back to original size. > If Nissan was happy to add heavy steel end plates to an EV that needs to > be as light as possible, just to keep the modules compressed, then who > am I to decide that I should omit those? > But don't take my word for it, try it yourself. > And let us know how you fare. > > BTW, I have seen what happens to modules that are overcharged to 4.3 > Volts. > Even with the heavy compression, some cells managed to generate enough > pressure to buckle some of the module walls and the guys that took the > pack apart had to make sure they were not in the line of "fire" when > they undid the nuts of the end plate - nut and wrench went flying! > At the normal 4.115V max, this excess will not happen, but the pressure > can easily be enough to damage the thin module sheet metal walls that > are not design to contain pressure, only to keep the cells aligned. You > can also pull the bus bars off the cells due to the working of the stack > of cells when uncompressed. Take your chances or follow the Nissan > design, it is your own choice and your own quality of work. > Regards, > > Cor van de Water > Chief Scientist > Proxim Wireless > > office +1 408 383 7626 Skype: cor_van_de_water > XoIP +31 87 784 1130 private: cvandewater.info > > http://www.proxim.com > > This email message (including any attachments) contains confidential and > proprietary information of Proxim Wireless Corporation. If you received > this message in error, please delete it and notify the sender. Any > unauthorized use, disclosure, distribution, or copying of any part of > this message is prohibited. > > > -----Original Message----- > From: paul dove [mailto:[email protected]] > Sent: Saturday, September 03, 2016 12:46 PM > To: Cor van de Water; Electric Vehicle Discussion List > Subject: Re: [EVDL] Alternatives for Golf Cart and Forklift batteries > > >> Lithium stack to the frame of the lift, you are aware that the Leaf >> cells (and probably other Li cells as well) must remain under >> compression or risk bursting the cell pouches open, inside the > modules? > > I don't believe that at all what proof do you have the cells need to be > compressed? A cell should only expand when it's damaged. > _______________________________________________ > 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/20160903/c9d8c37a/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)
