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nuckolls.bob(at)aeroelect
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 Posted: Sun Apr 21, 2013 4:10 am Post subject: Li-Ion Battery Failure Analysis |
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I ran across this document by the Exponent Failure Analysis Associates
that speaks to one of many studies being conducted on Li-Ion
battery failures.
http://tinyurl.com/cbxqa6e
The words 'shorts' + 'shorting' appear 44 times with
particular interest in micro-shorts that arise from
failures and/or manufacturing defects in separators.
Seems there are no process or inspection controls
that will keep these defects from finding their way
into finished cells . . . but there's a possibility
that cells can be screened for such defects before
being assembled into finished goods.
It's pretty heavy reading . . . I'm going to keep it
on the laptop for the next time I have to sit on an
airplane for several hours.
BTW . . . there's a rumor running around that the Cessna
ramp fire in the Citation battery was precipitated by
connection of the wrong ground power cart . . . I'm
still looking for credible confirmation/explanation
of the assertion.
Bob . . .
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edpav8r(at)yahoo.com
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| Posted: Sun Apr 21, 2013 6:03 am Post subject: Li-Ion Battery Failure Analysis |
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Bob,
Speaking of battery failures, I have an odd one here. It's a 18650 Li-Ion flashlight battery. The cell holds a charge fine, but in use, the flashlight flickers and shuts off a lot (another identical cell works perfectly). I suspect an intermittent fault in the cell's protection circuit, but I'm hesitant to open it up. I don't know what's inside and I don't want to find out in a shower of sparks!
Do you have any interest in dissecting it?
Eric
do not archive
On Apr 21, 2013, at 7:08 AM, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: | I ran across this document by the Exponent Failure Analysis Associates that speaks to one of many studies being conducted on Li-Ion battery failures.
[SNIP]
Bob . . .
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