According to a second aspect, an embodiment of this application provides an energy conversion apparatus, including a three-phase bridge arm converter, a motor winding, and a transformer. A direct current port of the three-phase bridge arm converter is connected to a battery; an alternating current port of the three-phase bridge arm converter is connected to the motor winding; two bridge arms of the three-phase bridge arm converter are connected to a secondary-side winding of the transformer through a first switch group, and the first switch group is configured to control connection and disconnection between the transformer and the two bridge arms of the three-phase bridge arm converter; a second switch group is further disposed between the motor winding and the two bridge arms of the three-phase bridge arm converter, and the second switch group is configured to control connection and disconnection between the motor winding and the two bridge arms of the three-phase bridge arm converter; and a primary-side winding of the transformer is connected to an alternating current charging port.

The energy conversion apparatus provided in the second aspect of this application may integrate a motor drive function by using the three-phase bridge arm converter and the motor winding, implement an alternating current charging function by reusing the two bridge arms of the three-phase bridge arm converter, and implement conversion between a motor drive mode and an alternating current charging mode by using the first switch group and the second switch group. Therefore, the energy conversion apparatus can not only integrate the charging function and the motor drive function, but also reuse some circuits. This further increases an integration level and reduces a volume.