Welcome to the club! If you have never exploded a battery you have really missed out. My charger was just about finished up around midnight one night a few summers back. My truck was in my driveway out in front of my house. I did not have my battery box vented well enough and something must have created a spark. I think I shook the whole cul-de-sac with that one. It was a very large boom. It took me a few days to find the lid of my battery box. It ripped off the hinges and blew up over my 2 story house and was hidden on the back side of my roof. A few cells got ruined, but for the most part I was just able to put everything back together and no real damage was done. I'm glad I did not have my truck in the garage, and even now do not charge in the garage. I figure if I ever make another mistake and explode things or catch something on fire, sitting in the back of my truck in my driveway is a fairly safe place for my battery to have problems. damon
> Date: Wed, 18 Jun 2014 08:54:29 -0400 > To: [email protected] > CC: [email protected] > Subject: [EVDL] Exploding cell > From: [email protected] > > Kaboom goes the cell! > > > > Was testing a battery module from my Prius on a battery analyzer. The test > plan begins with a several minute no-load, then a 1C load for up to 1 > hour, then a several minute no-load, then a charge at 1C until peak voltage > is detected. > > > > After 3 minutes, a cell exploded that could be heard all over the building. > > > > Best I can tell, there was a less than perfect connection to the battery > terminal. The initial 1C load only lasted 3 seconds (when it determined > that the low-voltage had been reached). So then, 10 minutes later it began > a 1C charge (on what was a full battery). And we all know that charging a > full NimH battery will explode. > > > > Lesson learned. 1) Hang around and WAIT for the initial discharge and > WATCH that it is going correctly before leaving the test. > > 2) Always assume a battery may explode and do testing where it will do no > damage. > > > > Programmers: When programming battery analyzers consider a bad connection > on the DIScharge cycle that might give an erroneous indication of a > discharged battery and fault the test. Do not then continue to the charge > cycle. > > > > Bob, WB4APR > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140618/9fd812e4/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) > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140618/ca932db7/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)
