BATTERY MODULE INCLUDING MODULE HOUSING

Disclosed is a battery module that reduces damage of internal components during an assembling process and enhances the manufacturing efficiency. The battery module includes a plurality of cylindrical battery cells arranged in a horizontal direction and each standing upright in a vertical direction; and a module housing including outer sidewalls configured to form an inner space, a plurality of hollow tubes having inner sidewalls located in the inner space and extending in the vertical direction to accommodate the plurality of cylindrical battery cells therein, and a cavity formed by opening at least a part of vertical central portions of the inner sidewalls of the plurality of hollow tubes to form an empty space therein.