Energy storage system for electric vehicles

An energy storage module, comprising:

• an enclosure that is hermetically sealed and includes a heat sink on an exterior surface of the enclosure, the heat sink having multiple fins, with a first portion of the fins extending away from the exterior surface at a first height, and a second portion of the fins extending away from the exterior surface at a second height that is different than the first height;
• a plate mounted over the multiple fins, wherein the multiple fins are positioned between the exterior surface of the enclosure and the plate;
• a battery array with multiple separate battery cells located within the enclosure, wherein at least one of the battery cells has a pressure vent for releasing gases into the enclosure, and wherein the battery array is positioned adjacent to an interior surface of the enclosure that corresponds to the exterior surface that includes the heat sink;
• and
• a pressure relief panel mounted adjacent to a vent opening defined by the enclosure, wherein the pressure relief panel is hermetically sealed in position over the vent opening, and wherein the pressure relief panel is movable to unseal the vent opening to release gases from within the enclosure when the gasses exceed a threshold pressure.