A battery pack includes a plurality of battery modules arranged along at least one direction, a resistor connected to an abnormal battery module that operates abnormally among the battery modules to absorb energy, an event detector provided to detect the abnormal battery module, a switch to connect or disconnect each of the battery modules to/from the resistor to selectively form a closed circuit, and a controller to receive information from the event detector and control the switch to form a current path between the abnormal battery module and the resistor.