BATTERY MODULE, BATTERY PACK COMPRISING SAME, AND VEHICLE

Provided is a battery module that prevents performance degradation due to a swelling phenomenon caused by charging and discharging and increases durability. The battery module includes a cell assembly comprising a plurality of battery cells stacked in a left-right direction; and a module housing configured to accommodate the cell assembly therein. The module housing includes an upper plate covering an upper portion of the cell assembly, a left plate covering a left portion of the cell assembly, a right plate covering a right portion of the cell assembly, and a lower plate covering a lower portion of the cell assembly, and at least one of the left plate and the right plate includes a support portion having a shape protruding toward the cell assembly from an inner surface facing the plurality of battery cells to pressurize at least a part of the cell assembly with a relatively small volume expansion.