A battery module according to an embodiment of the present disclosure includes a battery cell stack in which a plurality of battery cells are stacked; a casing configured to surround the battery cell stack; and a heat transfer member to cool or heat the battery cells. The heat transfer member is disposed between any two adjacent battery cells of the battery cell stack. The heat transfer member is spaced apart from the battery cells and is configured to move into contact with the battery cells to cool or heat the battery cells.