A battery module according to an embodiment of the present invention comprises: an upper battery cell lamination and a lower battery cell lamination in which a plurality of battery cells are laminated on each other; a cooling fluid channel disposed between the upper battery cell lamination and the lower battery cell lamination; and a module frame for receiving the upper battery cell lamination and the lower battery cell lamination. An inlet for supplying a refrigerant to the cooling fluid channel and an outlet for discharging the refrigerant from the cooling fluid channel are disposed on opposite sides, so that the refrigerant flows in one direction in the cooling fluid channel. The lengthwise direction of the battery cell is parallel to the one direction in which the refrigerant flows.