Abstract: A power supply device includes a first and a second battery cell. A ratio of first parameters of the first battery cell to the second battery cell is greater than a first threshold. A ratio of second parameters of the second battery cell to the first battery cell is greater than a second threshold. When a capacity of the first battery cell is greater than that of the second battery cell, the first battery cell and/or the second battery cell are/is discharged according to a rule including a first, a second, and a third condition. When the first condition is satisfied, the first battery cell is discharged to a load. When the second condition is satisfied, the first battery cell and the second battery cell are discharged to the load. When the third condition is satisfied, the first battery cell is discharged to the second battery cell and the load.

Abstract: A heating circuit of a power battery is provided. The power battery includes a first battery core group and a second battery core group connected in series. The heating circuit includes an inverter, an alternating current motor, and a first controller. A neutral point of the alternating current motor is connected to a first connection point between the first battery core group and the second battery core group. The first controller is configured to input a driving signal to control the inverter to alternately connect the first battery core group to the alternating current motor and the second battery core group to the alternating current motor, to cause the first battery core group and the second battery core group to charge each other.