PPRuNe Forums - View Single Post - 787 Batteries and Chargers - Part 1
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Old 11th Feb 2013, 14:45
  #626 (permalink)  
syseng68k
 
Join Date: Jun 2009
Location: Oxford, England
Posts: 297
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RR_NDB, 606

Away for a few more days - work still must be done .

Re: The red herring comment, spikes on the bus are way down the list
of possible suspects imho. Although the data sheets don't provide an
ac model for the cell, one would expect the self capacitance to be
very high, the self inductance to be very low, and the esr to be in
the fractions of a milliohm range. All this would provide very good
damping for any transients on the bus. It's still good to discuss it
though, even if everyone doesn't agree - it would be pretty boring
and unproductive if we all did.

For me, it's still down to battery management, at the risk of banging
on about it. Either charge or load related. I still don't see any reason
why those batteries caught fire and the if bms was doing it's job right, it
should have disconnected the battery at the first sign of trouble, which
it should have been able to detect. No excuses please.

Just like the unprotected electronics and harness in the enclosure,
perhaps too many (arrogant ?) assumptions made during the bms design
stage...

Last edited by syseng68k; 11th Feb 2013 at 14:50.
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