Two years of constant thermal cycling is plenty for aluminum connections to develop serious resistance issues. Sand and grease (noalox worked for me) the terminals and the issues will go away.
On Wed, Aug 13, 2014 at 2:20 PM, Danpatgal via EV <ev@lists.evdl.org> wrote: > I am using 38x130 ah CALBs in my Lectric Leopard and have had a too hot (> > 40C) warning on my BMS come on a few times in the last month or so. Today, > after a longer stretch of accelerating uphill to home, I checked some of > the > battery posts. Measuring with a laser sensor, several of them were around > 33C , in a grouping, maybe 6 or 8 posts adjacent on the most positive side > of my pack. Posts just a few cells more negative were much cooler, maybe > around 26C or cooler. > > I checked the bolts to make sure they were tight, and didn't notice any > real > problem with the connections being loose. My only other thought is that > perhaps (as has been discussed in other threads), these connections have > corroded over time ... adding a little resistance layer (I didn't initially > polish or use Noalox on those) that is now finally heating up. I am also > using the original copper straps with steels M8 bolts. > > Are others noticing this kind of heat with the lithium cell terminals? > Aside from just cleaning the terminals and putting on some Noalox, might > there be other things to do? I installed these in Sep. 2012, so they are > not quite two years in service. > > Thanks - Dan > > > > ----- > Dan Gallagher > http://www.evalbum.com/3854 > > -- > View this message in context: > http://electric-vehicle-discussion-list.413529.n4.nabble.com/CALB-bolt-terminals-getting-hot-tp4670981.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 > For EV drag racing discussion, please use NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -- www.electric-lemon.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140813/05cc381f/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)
