US 11,876,197 B2
Vehicle and power battery heating apparatus and method thereof
Heping Ling, Shenzhen (CN); Hua Pan, Shenzhen (CN); Yuxin Zhang, Shenzhen (CN); Guo Tian, Shenzhen (CN); and Zhao Xie, Shenzhen (CN)
Assigned to BYD COMPANY LIMITED, Shenzhen (CN)
Appl. No. 17/416,781
Filed by BYD COMPANY LIMITED, Shenzhen (CN)
PCT Filed Dec. 20, 2019, PCT No. PCT/CN2019/127111
§ 371(c)(1), (2) Date Jun. 21, 2021,
PCT Pub. No. WO2020/125770, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 201811574198.9 (CN), filed on Dec. 21, 2018.
Prior Publication US 2022/0077518 A1, Mar. 10, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 10/615 (2014.01); H01M 10/613 (2014.01); H01M 10/625 (2014.01); H01M 10/635 (2014.01); H01M 10/6567 (2014.01); H01M 10/663 (2014.01); B60L 58/27 (2019.01); H02J 7/00 (2006.01); H01M 10/48 (2006.01)
CPC H01M 10/615 (2015.04) [B60L 58/27 (2019.02); H01M 10/48 (2013.01); H01M 10/486 (2013.01); H01M 10/613 (2015.04); H01M 10/625 (2015.04); H01M 10/635 (2015.04); H01M 10/6567 (2015.04); H01M 10/663 (2015.04); H02J 7/0047 (2013.01); H02J 7/007194 (2020.01); H01M 2220/20 (2013.01)] 20 Claims
OG exemplary drawing
 
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.