My Brass bolts, bronze lock washers with copper straps on my TS cells have not come loose. I have 4 years on this pack now. I put NO-AL-OX in the threads after cleaning the surface of the terminals and, obviously, before putting the bolts in. If I ever have to redo my pack I will clean off the gunky NO-AL-OX and use NO-OX-ID "A SPECIAL" since it doesn't appear to get gunky.
Another method which has worked well for many is to use Nord-Lock (www.nord-lock.com) washers instead of lock washers. On Mon, Jan 6, 2014 at 1:09 PM, Roland <e...@msn.com> wrote: > In all electrical connections we use in devices such as wire terminals, buss > bars, circuit breakers, circuit breaker buss connections, are cadmium plated > copper or aluminum metals. We do not use any contact aids on cadmium plated > devices. > > There is a shunt tester that can be purchase from electrical supply houses to > test the conductance of a connection. In some installations, we are required > to record the data of the connections and verify by a QC inspector. > > Roland > ----- Original Message ----- > From: Lee Hart<mailto:leeah...@earthlink.net> > To: Electric Vehicle Discussion List<mailto:ev@lists.evdl.org> > Sent: Monday, January 06, 2014 11:35 AM > Subject: Re: [EVDL] Keeping LiFePO4 battery terminals tight every 10k miles > > > Mark Hanson wrote: > > ... I found a few other battery terminal bolts not tight after 20k > > miles (even with sealing paint on terminal bolts CALB 130). > > So it's best to tighten terminal bolts on lithiums every 10k miles it > > seems. I used to tighten terminal bolts on old lead GC batteries > > every 500 miles but didn't think it was necessary with lithiums but > > apparently they need it as well just less often. > > Soft metals like lead, aluminum, and copper can "cold flow" due to > pressure. Temperature cycling and vibration also play a part. > > Unfortunately, these factors are common in electrical connections. These > soft metals are used for their high electrical conductivity. High > currents make the temperature extremes worse due to self-heating. > > Dis-similar metals are another factor. These create corrosion couples, > that corrode if the joint isn't absolutely air tight. They expand at > different rates with temperature, leading to large pressure changes in > the joint. Inexperienced or cheapskate designers seem to have a total > disregard for the metals used in their electrical contacts. They ignore > 100 years of experience and use whatever metals are handy. > > My guess is that if (for example) you bolt a copper strip to an aluminum > stud with a stainless steel screw, it's hopeless to expect a reliable > connection. > -- > "Obsolete" means nothing more than "the salesmen would prefer you buy > something else." -- Dave McGuire > -- > Lee Hart -- See my Xmas projects at > www.sunrise-ev.com/projects.htm<http://www.sunrise-ev.com/projects.htm> > _______________________________________________ > UNSUBSCRIBE: > http://www.evdl.org/help/index.html#usub<http://www.evdl.org/help/index.html#usub> > > http://lists.evdl.org/listinfo.cgi/ev-evdl.org<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/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/20140106/5c0fd2fa/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) > -- 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)
