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)
