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An energy storage device that includes a housing, which includes at least one end panel that includes at least one aperture therethrough. The device further includes a battery cell housed in the housing. The battery cell includes mutually opposed first and second faces joined at their edges. The dev

An energy storage device that includes a housing, which includes at least one end panel that includes at least one aperture therethrough. The device further includes a battery cell housed in the housing. The battery cell includes mutually opposed first and second faces joined at their edges. The device also includes a heat sink adjacent to the battery cell and in thermal contact with the first face of the battery cell. The heat sink defines at least one cooling medium passage extending parallel to the face of the adjacent battery cell. The cooling medium passage opens onto the at least one aperture formed through the at least one end panel of the housing.

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1. An energy storage device comprising: a housing comprising opposed first and second end panels, wherein the first and second end panels are substantially parallel to one another, and wherein the first end panel defines a first plurality of slots and the second end panel defines a second plurality

1. An energy storage device comprising: a housing comprising opposed first and second end panels, wherein the first and second end panels are substantially parallel to one another, and wherein the first end panel defines a first plurality of slots and the second end panel defines a second plurality of slots, the first plurality of slots aligned with the second plurality of slots;plural battery modules housed in the housing, the battery modules comprising: plural battery cells having respective first and second side edges; andplural heat sinks interleaved between the plural battery cells and in thermal contact with the cells, wherein the heat sinks define a plurality of cooling medium passages having first and second cooling medium passage openings at respective first and second ends of the heat sinks, which extend past the first and second side edges of the battery cells; andan encapsulant enclosing at least a portion of at least one of the battery cells or the heat sinks;wherein the first and second ends of the heat sinks are disposed in the first plurality of slots and in the second plurality of slots, respectively, whereby the battery modules are supported by the slots;wherein the first plurality of slots extend entirely through the first end panel and the second plurality of slots extend entirely through the second end panel; andwherein the first and second slots and the plurality of cooling medium passages define passageways that extend entirely through the energy storage device such that air passing through one of the passageways is fluidly isolated from air passing through another of the passageways over an entire transit pathway through the housing. 2. An energy storage device as claimed in claim 1, wherein: electrodes of the plural battery cells are electrically interconnected in series or in parallel or in combination thereof. 3. An energy storage device as claimed in claim 1, wherein at least one of the plural heat sinks mechanically engages one of the first and second end panels for supporting the plural battery cells within the housing. 4. An energy storage device as claimed in claim 1, wherein the plural heat sinks are aluminum, and the cooling medium passages are rectangular in lateral cross section. 5. An energy storage device as claimed in claim 1, wherein the heat sinks mechanically engage the first plurality of slots and the second plurality of slots, the slots being successively spaced at a distance less than the combined thickness of one of the heat sinks and one of the battery cells, such that at least one of the first and second end panels holds the plural battery cells in compression; and wherein the plural battery cells are compressed to less than about 99% of preassembled thickness. 6. An energy storage device as claimed in claim 1, wherein the battery cells comprise lithium-ion battery cells. 7. An energy storage device as claimed in claim 6, wherein the lithium-ion battery cells comprise lithium-ion pouch cells. 8. An energy storage device as claimed in claim 7, wherein the energy storage device is in an off-highway vehicle. 9. An energy storage device as claimed in claim 6, wherein the energy storage device is in an off-highway vehicle. 10. An energy storage device as claimed in claim 1, wherein the energy storage device is in an off-highway vehicle.