| 主权项 |
1. A battery unit that can be connected to a power supply line via an external terminal, so as to allow the battery unit to be charged and discharged via the power supply line thus connected, the battery unit comprising:
a battery cell group comprising a plurality of battery cells; a control unit that detects an electric potential at the power supply line and an electric potential at the battery cell group, and that outputs a control signal based on a voltage difference between the power supply line and the battery cell group; and a switching unit that is arranged between the power supply line and the battery cell group, and that switches a path, according to the control signal, between a normal path and a resistance path having a resistance value that is higher than that of the normal path and connected in parallel with the normal path, so as to control a current that flows between the power supply line and the battery cell group; wherein the control unit outputs the control signal such that, when the battery unit is connected to the power supply line via the external terminal, the battery cell group is connected to the power supply line via the resistance path until the voltage difference becomes a predetermined voltage difference, and such that, when the voltage difference becomes the predetermined voltage difference, the battery cell group is connected to the power supply line via the normal path. |
