BATTERY PACK

A battery pack including a plurality of cell assemblies, and a pack case providing a space in which the cell assemblies are seated, the pack case including: a base plate supporting a lower portion of the cell assemblies; and a separation wall interposed between a pair of neighboring cell assemblies such that each cell assembly is separated, and coupled to the base plate. The separation wall is coupled to the base plate by a coupling member vertically penetrating the bottom of the base plate.