A battery module according to one embodiment of the present invention comprises: battery cell stacks: first and second cell block assemblies arranged in a direction perpendicular to a stacking direction of the battery cell stacks; a module frame accommodating the first and second cell block assemblies and having an open front and rear; and a cooling plate disposed below the bottom of the module frame, wherein the cooling plate has a flow path through which a refrigerant flows, wherein the flow path is formed in a direction parallel to the arrangement direction of the first and second cell block assemblies.