BATTERY MODULE, AND BATTERY PACK AND VEHICLE COMPRISING SAME

A battery module includes three cell stacks including: a plurality of battery cells; a cell tray including a base plate on which the three cell stacks are seated, and three split plates disposed upright on the base plate and configured to partition a space so that the three cell stacks may be disposed in spaces separated from each other; a module housing configured to accommodate the three cell stacks and the cell tray, and having a hexagonal pillar shape; and a bus bar frame assembly configured to cover an opening formed in an upper portion of the module housing and electrically connecting the plurality of battery cells.