The prius has 28 modules, and each module (about the size of a paper back book, only taller) has 6 cells. Each cell is about a 5 AH cell. So the module voltage was about 7.5 volts.
Bob *From:* [email protected] [mailto:[email protected]] *Sent:* Wednesday, June 18, 2014 9:20 AM *To:* [email protected] *Cc:* [email protected] *Subject:* Re: [EVADC Listserve] Exploding cell Were you testing a pack of cells, if so, how many cells total in the pack and what is pack voltage? Just curious Bob, I don't know much about NimH. On Wed, Jun 18, 2014 at 8:54 AM, Robert Bruninga [email protected] [EVADC] < [email protected]> wrote: 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 __._,_.___ ------------------------------ Posted by: jo reyes <[email protected]> ------------------------------ Remember- DO NOT FORWARD messages from this listserve! Thanks! [image: Image removed by sender.] *Visit Your Group <https://groups.yahoo.com/neo/groups/EVADC/info;_ylc=X3oDMTJlcGlzOWU5BF9TAzk3MzU5NzE0BGdycElkAzc0NTY4MzMEZ3Jwc3BJZAMxNzA1MTI2MjEyBHNlYwN2dGwEc2xrA3ZnaHAEc3RpbWUDMTQwMzA5NzU4Mg-->* [image: Image removed by sender. Yahoo! Groups] <https://groups.yahoo.com/neo;_ylc=X3oDMTJkMWJtcGVkBF9TAzk3NDc2NTkwBGdycElkAzc0NTY4MzMEZ3Jwc3BJZAMxNzA1MTI2MjEyBHNlYwNmdHIEc2xrA2dmcARzdGltZQMxNDAzMDk3NTgy> • Privacy <https://info.yahoo.com/privacy/us/yahoo/groups/details.html> • Unsubscribe <[email protected]?subject=Unsubscribe> • Terms of Use <https://info.yahoo.com/legal/us/yahoo/utos/terms/> __,_._,___ -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140618/12720d41/attachment.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: image001.jpg Type: image/jpeg Size: 332 bytes Desc: not available URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140618/12720d41/attachment.jpg> -------------- next part -------------- A non-text attachment was scrubbed... Name: image002.jpg Type: image/jpeg Size: 359 bytes Desc: not available URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140618/12720d41/attachment-0001.jpg> _______________________________________________ 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)
