A battery module includes a cell stack having a plurality of battery cells stacked in one direction, and an ICB assembly electrically connected to the plurality of battery cells to sense voltage information. The ICB assembly includes front and rear bus bar frames, a sensing member, and at least one bridge plate. The front and rear bus bar frames are assembled to respective front and rear sides of the cell stack, the front and rear bus bar frames each having a respective plurality of bus bars that are in contact with electrode leads of the battery cells. The sensing member has one side fixed to the front bus bar frame and the other side fixed to the rear bus bar frame; and the at least one bridge plate is connected to the front and rear bus bar frames to maintain a gap of a constant distance therebetween.