PPRuNe Forums - View Single Post - 787 Batteries and Chargers - Part 1
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Old 18th Feb 2013, 21:32
  #722 (permalink)  
RR_NDB
 
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Look more carefully to what i posted

Hi,

Bill,

That is the current design.



Does nothing to prevent a thermal runaway.


You will reduce drastically the likelihood of a DANGEROUS battery thermal runaway. BOS JAL was! ANA TAK, NOT!. A cell thermal runaway (with separated cells) is not a major problem.

A noble attempt to.....what?
To do a proper and safer battery management! When a given cell starts an internal short (BOS as per NTSB findings) itīs temp will be COMPLETELY different than the other cells. I seems (to be confirmed) the design of this BAD battery doesnīt process each cell temperature.

To better "balance" charging?
only:

The BAD battery algorithm will be reviewed, right? Letīs improve it. The opportunity is now to even derate the battery, if safety is the goal. And if this derating is not possible, SWITCH to Ni Cdīs as most of us would like.

Itīs an ABSURD whatīs happening. Itīs just a battery.

All this does is underscore how badly Thales and BOEING designed the system in the first place.
Obviously this could help faster redesign approval.

"INFLIGHT FIRE MANAGEMENT SYSTEM"
Problem was FIRE. In TAK "mother nature" saved the day from fire: Due a HEAVY short circuit to ground. But 5 kg of sprayed electrolyte inside a EEbay is
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