If the certifications were met, and they were, there would be no need for such extensive monitoring.
EXCEPT in a test Programme. Boeing tested and concluded there would be no propagation cell to cell, and any cell failure, any kind, could therefore be effectively ignored.
I think the reason we have not heard about extensive monitoring in these systems is because there is none.
EG: The JAL battery likely went off line immediately when the single heat sensor recorded temperature limit. But by that time, Electrical circuitry was not a concern, because at that point, explosive expansion, flame, and smoke became the issue.
NTSB stated there were no over voltage issues. That means to me, there was a shutdown, but not due to electrical circuitry issues.
Overtemp. Likely due the construction/architecture/ageing?
IOW: The system Worked....By design. Badly.
That may soon change?
Last edited by Lyman; 11th February 2013 at 17:14.