BATTERY MODULE

A battery module may effectively cool the plurality of battery cells by using the heat sink. The battery module includes an outer case having an accommodation space therein; an inner case having a storage space therein, the inner case being in the accommodation space; a plurality of battery cells in the storage space; a heat sink in the accommodation space with the heat sink being between the inner case and one side wall of the outer case and configured to cool the battery cells; and a pressing part in the accommodation space and having at least a portion between the other side wall of the outer case, which is opposite to the one side wall, and the inner case. The pressing part is configured to press the inner case toward the heat sink.