18484552. HIGH-FREQUENCY ALTERNATING CURRENT BATTERY HEATING USING VOLTAGE COMMANDS (GM GLOBAL TECHNOLOGY OPERATIONS LLC)

HIGH-FREQUENCY ALTERNATING CURRENT BATTERY HEATING USING VOLTAGE COMMANDS

Organization Name

GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor(s)

Renato Amorim Torres of Pontiac MI US

Suresh Gopalakrishnan of Troy MI US

Lei Hao of Troy MI US

Chandra S. Namuduri of Troy MI US

Vinod Chowdary Peddi of Shelby Charter Township MI US

HIGH-FREQUENCY ALTERNATING CURRENT BATTERY HEATING USING VOLTAGE COMMANDS

This abstract first appeared for US patent application 18484552 titled 'HIGH-FREQUENCY ALTERNATING CURRENT BATTERY HEATING USING VOLTAGE COMMANDS

Original Abstract Submitted

A method for heating a battery pack of an electrified powertrain system having an electric motor includes determining a temperature of the battery pack. Responsive to the battery temperature being less than a predetermined threshold temperature, the method includes executing a self-heating mode of the battery pack. This includes injecting a high-frequency direct-axis alternating current voltage waveform that minimizes output torque and prevents rotation of a rotor of the electric motor. An AC current waveform is applied to the battery pack as a result of the voltage injection. A controller includes a temperature sensor configured for determining a temperature of the battery pack and a processor configured to perform the method. A motor vehicle includes the controller, an electrified powertrain system having the battery pack and an electric motor, and road wheels connected to and powered by electric motor.