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

Claim 1:
2. The power battery heating method according to claim 1, wherein the heating process comprises a plurality of heating periods, each heating period comprises two preset heating durations and two preset switching durations, the preset direct-axis current is in a positive direction and has a constant amplitude value within the first preset heating duration, the preset direct-axis current is in a negative direction and has a constant amplitude value within the second preset heating duration, the preset direct-axis current changes from the positive direction to the negative direction and has a constantly changing amplitude value within the first preset switching duration, and the preset direct-axis current changes from the negative direction to the positive direction and has a constantly changing amplitude value within the second preset switching duration; and the preset heating duration is greater than the preset switching duration.