Thermal Runaway is caused by part of a cell or cells being warmer than other cells as the cell warms is to voltage drops and the other cells power into that cell or can be caused by a failure of that cell usually a failure of a Cell results in a fuse being blown fusible link being blowing a good way to avoid thermal runaway is to maintain all the cells at the same temperature with an active cooling system. Systems like the Nissan Leaf use packs instead of individual cells this greatly reduces the potential for thermal Runaway however the surge-charge-rate are reduced with this style of cell. Thermal runaway most commonly occurs on charging however it can occur on discharging also. As many of us know thermal runaway can occur with lead acid AGM type batteries and even flooded if too many cells are placed in parallel.
On Oct 5, 2017 8:45 AM, "Drake" <drake.chamber...@redwoodalliance.org> wrote: > Hello Wrenches, > > I've been contacted by a group who will be taking apart lithium ion > battery packs that have been retired, finding the bad cells and recombining > the remainder, then putting them in larger configurations for use in PV > systems and electric vehicles. > > How can thermal runaway be avoided? Is there any information that could be > of use in making these systems safe and effective? > > Thanks, > > Drake > > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.or > g/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
