A battery module is composed of a plurality of battery cells according to an embodiment of the present invention and includes one positive output terminal formed by connecting the plurality of battery cells, one negative output terminal formed by connecting the plurality of battery cells, a field effect transistor (FET) provided on a current path between the positive output terminal and an external device, a temperature information measurer for measuring temperature information of the plurality of battery cells, and a protection integrated circuit (IC) chip for controlling the FET.