A battery module includes: a cell assembly including a plurality of battery cells and a cell housing in which the plurality of battery cells are accommodated; and a battery management system (BMS) assembly including a BMS circuit board, a BMS cover accommodating the BMS circuit board, and at least one temperature sensor module connected to the BMS circuit board and fixedly mounted on a rear surface of the BMS cover, the BMS assembly being mountably and detachably provided on a side surface of the cell housing, and the temperature sensor module contacts one of the plurality of battery cells.