A battery module includes a plurality of battery cells stacked on one another in a first direction and configured to form a stacked structure. In particular, some battery cells of the plurality of battery cells are coated with hot melt respectively interposed between some battery cells of the plurality of battery cells to fix the battery cells. The battery module further includes a pair of end plates that surface-contact with opposite end battery cells of the stacked structure; and a pair of bus bar assemblies arranged at opposite ends of the stacked structure in a second direction perpendicular to the first direction and configured to connect electrodes of the plurality of battery cells located at opposite ends in the second direction to each other.