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 in one direction, a module frame that houses the battery cell stack, a busbar frame that covers the front surface or the rear surface of the battery cell stack, and an end plate that couples to the module frame and covers the busbar frame, wherein the end plate is formed with at least one opening, wherein a part of the inner member of the battery module is exposed to the outside through the opening, and wherein a gap between the inner member and the opening is sealed with a sealing member.