Patent ID: 8828577

Claim:
An energy storage system, comprising: at least one energy storage module adapted to supply electrical energy to a hybrid vehicle, the energy storage module including: a sealed primary enclosure having a first end and a second end; at least one battery array located within the primary enclosure, wherein the battery array has a plurality of battery cells with at least one cell of the plurality of cells disposed on an interior surface of the primary enclosure, wherein one or more cell retainers is in contact with two or more adjacent cells of the plurality of battery cells, wherein the one or more cell retainers are formed from a thermally insulative material that is free of electrical connections to electrical circuits, and wherein the thermally insulative material is arranged and configured to limit heat transfer between the plurality of battery cells; a heat sink disposed on an exterior surface of the primary enclosure that corresponds with the interior surface, the heat sink comprising a plurality of fins; and a fan mounted to an exterior surface of the first end of the primary enclosure; wherein the fan is operable to direct air across the fins toward the second end of the primary enclosure.