A battery module according to an embodiment of the present invention comprises: a battery cell stack comprising a plurality of battery cells stacked together in one direction; a module frame accommodating the battery cell stack therein; a busbar frame covering the front or rear surface of the battery cell stack; and an end plate coupled to the module frame and covering the busbar frame, wherein the end plate has at least one opening through which a part of an inner member of the battery module is exposed to the outside, and the gap between the inner member and the opening is sealed with a sealing member.