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

Claim 19:
20. A vehicle, comprising:
a power battery, a coolant tank, a pump, and a water pipeline, wherein the pump inputs a coolant in the coolant tank into the water pipeline according to a control signal, and
a power battery heating apparatus, comprising:
a three-phase inverter, connected to a positive electrode and a negative electrode of a heating energy source configured to provide heating energy;
a three-phase alternating current motor, wherein three phase coils of the three-phase alternating current motor are connected to three phase legs of the three-phase inverter; and
a controller, wherein the controller is respectively connected to the three-phase inverter and the three-phase alternating current motor, and is programmed to obtain a current temperature value of the power battery, and determine that the current temperature value of the power battery is lower than a preset temperature value, and obtain heating power of the power battery; the controller is further programmed to obtain a preset quadrature-axis current, and obtain 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 the three-phase alternating current motor to fall within a target range, and zero is not comprised in the target range; and the controller is further programmed to control an on/off status of a power device in the three-phase inverter, so that the three-phase alternating current motor generates heat according to the heating energy provided by the heating energy source, to heat a coolant flowing through the power battery, and control, 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,

wherein the water pipeline passes through the power battery and the power battery heating apparatus.