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You need to get educated before you post false statements. Just one of many articles:

...The trouble all started in May, when the National Highway Traffic Safety Administration (NHTSA) carried out a routine 20 mph (32km/h) crash test on a Volt—to simulate a sideways impact with a tree or telegraph pole followed by a rollover. Three weeks after the test, the car’s 16 kilowatt-hour battery pack caught fire in NHTSA’s car park, destroying the vehicle and several others nearby.

Shortly thereafter, both NHTSA and the carmaker repeated the side-impact and rollover test on at least two other cars, all to no effect. However, in subsequent tests—carried out in November by experts from the energy and defence departments as well as GM—the investigators deliberately damaged the battery packs and ruptured their coolant lines. One battery pack behaved normally. Another emitted smoke and sparks hours after it was flipped on its back. And a third exhibited a temporary increase in temperature, but then burst into flames a week later.

GM claims the initial fire in June would never have happened if the NHTSA's engineers had drained the Volt’s battery immediately after the impact. It is odd that they did not. When crash testing a conventional petrol-powered car, the standard procedure is to drain the fuel tank to prevent any chance of fire. It would seem reasonable to do the equivalent with an electric vehicle.

...To help keep the Volt’s 435lb (197kg) battery pack at the right temperature, GM designed a sophisticated thermal-management system. This is separate from the main radiator system, which cools the range-extending motor-generator (a 1.4-litre petrol engine) and feeds the car’s heater. The battery pack, mounted in a T-shaped steel tray with a plastic cover, runs down the centre of the vehicle.
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