BYD has been granted a patent for a power battery heating method for vehicles. The method involves controlling a three-phase inverter to generate heat in a motor, heating a coolant flowing through the battery. The process adjusts phase current based on preset direct and quadrature-axis currents. GlobalData’s report on BYD gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on BYD, Battery management systems was a key innovation area identified from patents. BYD's grant share as of January 2024 was 70%. Grant share is based on the ratio of number of grants to total number of patents.
Power battery heating method for vehicles
A recently granted patent (Publication Number: US11876197B2) discloses a power battery heating method and apparatus designed for vehicles. The method involves monitoring the current temperature of the power battery and activating a heating process if the temperature falls below a preset value. By controlling the on/off status of a power device in a three-phase inverter, a three-phase alternating current motor generates heat to warm the coolant flowing through the power battery. The method also adjusts the phase current of the motor based on preset direct-axis and quadrature-axis currents, with the direction of the direct-axis current periodically changing during the heating process. Additionally, the method includes various fault detection mechanisms to ensure safe and efficient heating of the power battery.
The patent also covers a power battery heating apparatus that implements the heating method. This apparatus includes a three-phase inverter, a three-phase alternating current motor, and a controller programmed to manage the heating process. The controller monitors the power battery temperature, determines the heating power required, and adjusts the direct-axis and quadrature-axis currents accordingly. It also includes temperature monitoring units to prevent overheating of components and feedback mechanisms to reduce the direct-axis current if the power battery reaches a specified temperature. The apparatus is designed to efficiently heat the power battery of a vehicle, ensuring optimal performance and longevity of the battery system.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
