Battery Rupture Plate
Having now had the opportunity to view the manufacturers outline spec sheet for the Yuasa Li-Co cells I see the rupture plate is apparently in the side of the battery rather than on top as conventional. This might give the opportunity to place a vent path from this rupture plate to the outside rather than have the emitted chemicals destroy the rest of the contents of the battery case as seems to have happened in the pictures shown on this thread. Clearly the designers of the battery box were confident that the 4 battery management systems (2 in box 2 outside) would ensure that a cell never did rupture.
The requirement for maturity and Aeropspace certification may in this case have been counterproductive in that an older less safe battery chemistry is used in preference to a newer fundamentally safer chemistry.
Does anyone know the pressurisation status of the electronics compartment where the battery is housed. I am slightly mystified as to how the chemicals were vented overboard in one instance and smelled in cockpit and passenger compartment in another.