A battery module includes: a battery cell stack in which a plurality of battery cells are stacked; a busbar frame covering at least a portion of at least one surface of the battery cell stack; a sensing member connected to the busbar frame; and side surface plates covering at least a portion of respective side surfaces of the battery cell stack, wherein each of the side surface plates includes a mounting part formed on an outer surface thereof, wherein an entirety of a lower surface of the battery cell stack is opened such that the lower surface is not covered by a frame of the battery module, and wherein outermost battery cells of the plurality of battery cells and the side surface plates are coupled to each other, respectively.