The present invention is to provide a battery management system, the battery management system is included in one battery pack and includes one or more battery cells including a negative electrode plate and a positive electrode plate, a negative electrode output terminal for outputting the voltage of the negative electrode plate and a voltage of the positive electrode plate The positive electrode output terminal is included in the battery pack, and a battery management module that electrically connects and disconnects the battery cell and the positive electrode output terminal, and is configured outside the battery pack, one end of which is electrically connected to the positive electrode plate and the other end of the battery management module. And a start switch that is electrically connected to control the start of the battery management module. At this time, when the ignition switch is turned on, the battery management module is turned on when the residual voltage of the battery cell is greater than or equal to a threshold, so that the voltage of the battery cell is output through the positive output terminal, and maintains an off state when the residual voltage of the battery cell is below a threshold do.
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