Was it compressed?
Plenty others have found that uncompressed cells will not just
bulge but actually destroy themselves when they charge fast enough
to generate a lot of gassing...

Cor van de Water
Chief Scientist
Proxim Wireless Corporation http://www.proxim.com
Email: cwa...@proxim.com Private: http://www.cvandewater.info
Skype: cor_van_de_water Tel: +1 408 383 7626


-----Original Message-----
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Robert Bruninga
via EV
Sent: Wednesday, June 18, 2014 8:01 AM
To: ev...@yahoogroups.com
Cc: ev@lists.evdl.org
Subject: Re: [EVDL] [EVADC Listserve] Exploding cell

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:* ev...@yahoogroups.com [mailto:ev...@yahoogroups.com]
*Sent:* Wednesday, June 18, 2014 9:20 AM
*To:* ev...@yahoogroups.com
*Cc:* ev@lists.evdl.org
*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 bruni...@usna.edu
[EVADC] <
ev...@yahoogroups.com> 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








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