In message
<OFA00408F8.C2AAF2B2-ON88257983.00655457-88257983.0065C93E@US.Schneider-E
lectric.com>, dated Thu, 12 Jan 2012,
[email protected] writes:
As I understand it, of this battery chemistry is charged/discharged
correctly, there shouldn't be a problem, but how do they wear out?
The fire problem doesn't seem to be related to 'wear-out' - the
inference is that a manufacturing defect is involved, and that is
possibly the existence of voids in the construction, where layers that
should be in close contact are not.
These voids create areas of higher thermal resistance, and if the
temperature rises enough to melt solid electrode or electrolyte
materials, they may well turn from partial insulators to extremely good
(ionic) conductors.
I recall such an effect with wirewound resistors having a glass-fibre
core. Once a hot-spot developed and the glass melted, the resistance
dropped to near zero, with dazzling light effects and emission of magic
smoke.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
Some people who are peeling the finch of the financial crisis are thinking of
biting a rook.
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society emc-pstc discussion
list. To post a message to the list, send your e-mail to <[email protected]>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
Attachments are not permitted but the IEEE PSES Online Communities site at
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used
formats), large files, etc.
Website: http://www.ieee-pses.org/
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas <[email protected]>
Mike Cantwell <[email protected]>
For policy questions, send mail to:
Jim Bacher: <[email protected]>
David Heald: <[email protected]>
