Yesterday, 10:05 PM
Here's an updated flier for first responders dealing with an EV fire/crash from DOT dated 2014
http://www.nhtsa.gov/staticfiles/nvs/pdf/811575-InterimGuideHEV-HV-Batt_LawEnforce-EMS-FireDept-v2.pdf
While they note that damaged or burning battery packs may contain residual high voltages and leads and cables are to be avoided, the best and only solution seems to be "surround and drown".
A "B" class extinguisher could be used to knock down visible flames long enough to extract or rescue occupants, but without massive amounts of water to cool and stop a thermal runaway, your only other choice is to retreat, isolate and let it burn.
Apparently these batteries are not too different from lead acid batteries, in that they have plates, screens and spacers all wrapped around one another and submerged in an electrolyte solution. Rupture and short circuiting of these plates during charging or in crash, causes electrolyte boiling, offgassing then explosion and fire.
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