Patent ID: 11876197
Assignee: BYD COMPANY LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  Y | IPC B  H

Claim 0:
1. A power battery heating method, configured for heating a power battery of a vehicle, the power battery heating method comprising:
obtaining a current temperature value of the power battery, and determining that the current temperature value of the power battery is lower than a preset temperature value;
obtaining heating power of the power battery;
obtaining a preset quadrature-axis current, and obtaining a corresponding preset direct-axis current according to the heating power of the power battery, wherein a value of the obtained preset quadrature-axis current is a quadrature-axis current value that causes a torque value outputted by a three-phase alternating current motor to fall within a target range, and zero is not comprised in the target range; and
controlling an on/off status of a power device in a three-phase inverter, so that the three-phase alternating current motor generates heat according to heating energy provided by a heating energy source, to heat a coolant flowing through the power battery, and controlling, according to the preset direct-axis current and the preset quadrature-axis current, the three-phase inverter to adjust a phase current of the three-phase alternating current motor in the heating process, wherein a direction of the preset direct-axis current changes periodically in the heating process.