A battery module according to an aspect of the present disclosure includes a cooling plate provided in a plate shape and having a plurality of slits at respective predetermined positions, a plurality of battery cells uprightly disposed parallel to one another in one direction on the cooling plate, and a plurality of cooling fins, each cooling fin having a wall surface uprightly disposed over the cooling plate to come into contact with one surface of the battery cell and a lower flange integrally formed with the wall surface and disposed through the slit of the cooling plate to come into contact with a bottom surface of the cooling plate, the plurality of cooling fins spaced apart by a predetermined distance from one another and arranged between the plurality of battery cells.