Abstract: A battery pack includes a group of cells, a current path switch coupled to the group of cells, and a current monitoring system. The current monitoring system includes a signal detection unit, a logic unit and a current path control unit. The signal detection unit is coupled to the group of cells and/or a positive terminal of the battery pack, and used to detect at least one voltage signal of the group of cells and/or of the positive terminal of the battery pack. The logic unit is coupled to the signal detection unit, and used to generate a calculated value of a voltage signal of the at least one voltage signal and generate a logic signal according to the calculated value. The current path control unit is coupled to the logic unit and the current path switch, and used to control the current path switch according to the logic signal.