BATTERY MODULE STRUCTURED SO AS TO PREVENT ENTRY OF FOREIGN SUBSTANCES, AND BATTERY PACK AND MOTOR VEHICLE COMPRISING SAME

Disclosed is a battery module, which includes a cell stack formed by stacking a plurality of battery cells; a bus bar frame assembly having a bus bar frame configured to cover one longitudinal side and the other longitudinal side of the cell stack and a plurality of bus bars fixed on the bus bar frame and electrically connected to the battery cells; a module terminal having a lead connection portion fixed on the bus bar frame and electrically connected to the battery cells and a head portion connected to the lead connection portion to extend above the lead connection portion; a terminal nut located below the head portion; and a frame cover having a nut accommodation portion configured to accommodate the terminal nut and a bolt accommodation portion formed below the nut accommodation portion to accommodate a bolt passing through the head portion and the terminal nut, the frame cover being configured to cover the bus bar frame assembly so that the head portion is exposed to the outside.