Patent attributes
A charging and discharging circuit includes a first conversion circuit and a second conversion circuit. The input terminal of the first conversion circuit is used to connect an external power supply. The output terminal of the first conversion circuit is connected to the input terminal of the second conversion circuit and the first terminal of a battery pack, and the second terminal of the battery pack is grounded. N battery cells have N-1 common nodes. Each common node is connected to a corresponding output terminal of the second conversion circuit. In the embodiment of the present application, the second conversion circuit effectively “transfers” the excess charge on the cell with a higher battery voltage in the battery pack to the cell with a lower voltage through the uneven distribution of the charging current.
