US 12,080,863 B2
Vehicle and power battery heating apparatus and method therefor
Yubo Lian, Shenzhen (CN); Heping Ling, Shenzhen (CN); Hua Pan, Shenzhen (CN); Yuxin Zhang, Shenzhen (CN); and Hao Chen, Shenzhen (CN)
Assigned to BYD COMPANY LIMITED, Shenzhen (CN)
Appl. No. 17/416,884
Filed by BYD COMPANY LIMITED, Guangdong (CN)
PCT Filed Dec. 20, 2019, PCT No. PCT/CN2019/127109
§ 371(c)(1), (2) Date Jun. 21, 2021,
PCT Pub. No. WO2020/125769, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 201811574151.2 (CN), filed on Dec. 21, 2018.
Prior Publication US 2022/0080858 A1, Mar. 17, 2022
Int. Cl. H01M 10/615 (2014.01); B60L 3/00 (2019.01); B60L 58/27 (2019.01); H01M 10/42 (2006.01); H01M 10/48 (2006.01); H01M 10/613 (2014.01); H01M 10/625 (2014.01); H01M 10/6571 (2014.01)
CPC H01M 10/615 (2015.04) [B60L 3/0046 (2013.01); B60L 58/27 (2019.02); H01M 10/425 (2013.01); H01M 10/486 (2013.01); H01M 10/613 (2015.04); H01M 10/625 (2015.04); H01M 10/6571 (2015.04); B60L 2240/545 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A power battery heating method, configured for heating a power battery of a vehicle having a three-phase alternating current motor, a motor controller, and a heat conduction loop, the power battery heating method comprising:
obtaining a current temperature value of the power battery, and determining whether the current temperature value of the power battery is lower than a preset temperature value;
determining whether a current working status of the three-phase alternating current motor is a non-driving state, and whether one of the power battery, the three-phase alternating current motor, the motor controller, or the heat conduction loop is faulty;
in response to determining that the current temperature value of the power battery is lower than the preset temperature value, that the current working status of the three-phase alternating current motor is a non-driving state, and that none of the power battery, the three-phase alternating current motor, the motor controller, or the heat conduction loop is faulty, 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 the target range does not comprise zero; 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 a heating process of the power battery.