Battery management device and power supplying system including the same, electrically isolating each battery unit upon fault

A battery management device (3) is configured to detect a present state of an electric device, and control supply of electric power from a battery device (5) to a load (4) of the electric device. The battery device (5) includes a plurality of battery units (51) that are electrically connected. The battery management device (3) disables each of the battery units (51) to stop supply of the electric power to the load (4) when the electric device is detected to be in an abnormal state.