I recently took apart a nice little OEM battery pack and every terminal on it was barely hand tight. I reassembled with SS socket head screws instead of the Phillips screws, and torqued the 5mm bolts to spec. All you need to do is torque them right and they will not loosen. Do not use lock washers as they compromise the clamping force. If you look at bolted joints on high quality equipment you will find properly designed joints with no lubrication or thread-locker - they just torque the right. I worked for Caterpillar and can vouch for their practices - needed to survive the worst vibration environments imaginable. My Toyota cars over the last 30 years are all produced this way. I don't use conductive grease, I just go with clean and tight.
For reference: 1 N m = 8.8in lb = 0.74bft lb I tightened the 5's to 35 in lb (4 Nm). Unfortunately, there are a lot of units for measuring torque. Inch pounds are best for the small wrenches we have in the US. My joints were the terminals of 32120 cells, SS M5 screws, with nickel plated copper straps, and stainless steel flat washers (lock washers thrown away). I am not sure what the terminal with the tapped threads is made from. It is s tamped and formed part, maybe SS, but could be a plated brass or copper... On Mon, Jan 6, 2014 at 7:26 AM, Mark Hanson <[email protected]>wrote: > Hi Folk's, > last night a overvoltage battery balancer #22 shut down the charger at > 4.0V. At first I thought it was a bad OV balancer detector but after > replacing the circuit it still did it so I put a scope across the battery > cell and noticed the charging pulsed waveform going from 3.3V to 4.0V 60 hz > when adjacent cells were fairly solid (signifying a high impedance > condition). I thought I had a bad cell but after sanding under the copper > strap & adding 3M dielectric grease & torquing back down, it charged > perfectly with no faults, back to low impedance. 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 seams. 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. > Best Regards,mark > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140106/46bb23a0/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) > > -- Put this question to yourself: should I use everyone else to attain happiness, or should I help others gain happiness? *Dalai Lama * Tell me what it is you plan to do With your one wild and precious life? Mary Oliver, "The summer day." To invent, you need a good imagination and a pile of junk. Thomas A. Edison<http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> A public-opinion poll is no substitute for thought. *Warren Buffet* Michael E. Ross (919) 550-2430 Land (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone (919) 631-1451 Cell (919) 513-0418 Desk [email protected] <[email protected]> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140106/05e78ea7/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)
