If this is a change then I would investigate. I have had my pack in for over 4 years and have not had the issue you and others have had and my pack isn't exactly closed to moisture and dust. I have 40 TS-LFP100AHA cells in a 2p20s arrangement. Because the BMS I used to use attached to the heads of the terminal bolts I used brass bolts since they are much easier to drill and tap threads in. This also meant that I could assemble the pack and torque the bolts independent of the BMS connections so they could not interfere with any connections. Before assembling my pack I wire brushed all the terminals to shine them up. I did this with NOALOX on the terminals and SS wire brush so that the NOALOX would seal the metal as soon as possible. I also tapped all the terminal holes again, using NOALOX on the tap though this was probably way overkill. I did find some terminals that didn't get tapped all the way down. I then put NOALOX on the bolt threads before assembling. This was mostly so that the soft Al and Cu terminals wouldn't gall up at all. I used bronze lock washers, too. I have had no terminals come loose or get warm.
Some may say that what I did was a waste of time but they can't counter the results. It just works and I'm glad. LiFePO4 has been much simpler than lead acid in many ways. If I were you I would clean all the terminals using a similar process. If I were to do it over, and I have on small 4-8 cell packs, I would use NO-OX-ID "A SPECIAL" because it doesn't seem to get sticky over time like the NOALOX does. On Wed, Aug 13, 2014 at 2:20 PM, Danpatgal via EV <[email protected]> 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) > -- David D. Nelson http://evalbum.com/1328 http://www.levforum.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)
