PPRuNe Forums - View Single Post - 787 Batteries and Chargers - Part 1
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Old 27th Jan 2013, 14:33
  #186 (permalink)  
RR_NDB
 
Join Date: Feb 2011
Location: Nearby SBBR and SDAM
Posts: 873
Temp rise during fast charging after being heated during APU start

Hi,

Machinbird (#183):

"Temperature as trigger of cell short circuit."

This matches the model of the battery being "abused" by a fast charging (operating near or within itīs temp. limits)

The charging regime (APU batt.) could be the main BOS JAL factor. With cells probably degraded before? How many hours operated before?

Likely it was being recharged when started to fail. Or
(imo, less probable) started to runaway during or just after delivering high current to APU starter.
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