BATTERY PACK DESIGN AND METHOD

In at least one embodiment, provided is a battery pack for a vehicle including a thin firebox for enclosing batteries and containing thermal runaway gases, thermal insulation surrounding the firebox, and a vent hole extending through the firebox and the thermal insulation to an exterior of the vehicle with vent hole plug and a pressure relief frangible vent cover at least partially covering the vent hole plug to retain it within the vent hole.