Control system and method for battery pack heating system, and battery pack heating management system

Patent metadata

Field	Value
Publication number	US-11338702-B2
Application number	US-202117390873-A
Country	US
Kind code	B2
Filing date	Jul 31, 2021
Priority date	Jun 24, 2019
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

The application provides a control system and method for a battery pack heating system. The control system includes: a battery management system configured to acquire a state parameter of a battery pack, and send heating request information to a vehicle controller when determining the state parameter of the battery pack meets a preset heating condition; a motor controller configured to send, to the vehicle controller, feedback information indicating that a motor of the battery pack heating system is in a non-operating state, when determining the motor is in the non-operating state, and control, in response to a first control signal, a target upper bridge arm switch module and a target lower bridge arm switch module to be periodically turned on or off; and the vehicle controller configured to send the first control signal to the motor controller in response to the heating request information and the feedback information.

First claim

What is claimed is:

1. A control method for heating a battery pack, characterized by comprising:
sending by a motor controller, to a vehicle controller, feedback information indicating that a motor is in a non-operating state, when it is determined that the motor is in the non-operating state; and
controlling by the motor controller, in response to a first control signal, a battery pack heating system to periodically charge or discharge the battery pack,
wherein the first control signal is sent by the vehicle controller to the motor controller in response to the feedback information from the motor controller and heating request information from a battery management system, and configured to instruct the motor controller to control the battery pack heating system to periodically charge or discharge the battery pack.

2. The control method for heating the battery pack according to claim 1 , wherein the controlling by the motor controller, in response to a first control signal, a battery pack heating system to periodically charge or discharge the battery pack comprises:
controlling, by the motor controller, a target upper bridge arm switch module and a target lower bridge arm switch module of an inverter in the battery pack heating system to be periodically turned on or off, to charge or discharge the battery pack.

3. The control method for heating the battery pack according to claim 2 , further comprising:
acquiring, by the motor controller, a temperature of an inverter in the battery pack heating system and a temperature of the motor; and
controlling, by the motor controller, all switch modules of the inverter to be in an off state, when it is determined that at least one of both the temperature of the inverter and the temperature of the motor meets a preset over-temperature condition.

4. The control method for heating the battery pack according to claim 1 , wherein the controlling by the motor controller, in response to a first control signal, a battery pack heating system to periodically charge or discharge a battery pack comprises:
controlling by the motor controller, in response to the first control signal and via a periodic driving signal, the battery pack heating system to periodically charge or discharge the battery pack.

5. The control method for heating the battery pack according to claim 4 , further comprising:
acquiring, by the motor controller, a current parameter of the battery pack heating system; and
calculating, when the current parameter exceeds a preset desired current threshold range, a desired frequency and a desired duty cycle of the periodic driving signal based on the preset desired current threshold range, and adjusting a frequency and a duty cycle of the periodic driving signal to the desired frequency and the desired duty cycle,
wherein the current parameter comprises one or more of the following parameters: a busbar current between the battery pack and an inverter in the battery pack heating system, and phase currents between individual energy storage modules in the motor and respective bridge arms corresponding to the individual energy storage modules.

6. The control method for heating the battery pack according to claim 4 , further comprising:
calculating by the motor controller, in response to abnormal temperature rise information, a desired frequency and a desired duty cycle of the periodic driving signal based on a preset desired temperature rise rate range; and adjusting a frequency and a duty cycle of the periodic driving signal to the desired frequency and the desired duty cycle,
wherein the abnormal temperature rise information is sent to the motor controller by the vehicle controller and used to prompt the vehicle controller to increase or reduce heating current.

7. A motor controller, characterized by comprising:
a first module, configured to send, to a vehicle controller, feedback information indicating that a motor is in a non-operating state, when it is determined that the motor is in the non-operating state; and
a second module, configured to control, in response to a first control signal, a battery pack heating system to periodically charge or discharge a battery pack,
wherein the first control signal is sent by the vehicle controller to the motor controller in response to the feedback information from the motor controller and heating request information from a battery management system, and configured to instruct the motor controller to control the battery pack heating system to periodically charge or discharge the battery pack.

8. The motor controller according to claim 7 , wherein:
the second module is configured to control a target upper bridge arm switch module and a target lower bridge arm switch module of an inverter in the battery pack heating system to be periodically turned on or off, to periodically charge or discharge the battery pack.

9. The motor controller according to claim 8 , further comprising a fourth module configured to acquire a temperature of an inverter (P 2 ) in the battery pack heating system and a temperature of the motor,
wherein the second module is further configured to control all switch modules of the inverter to be in an off state, when it is determined that at least one of both the temperature of the inverter and the temperature of the motor meets a preset over-temperature condition.

10. The motor controller according to claim 7 , wherein:
the second module is configured to control, via a periodic driving signal, the battery pack heating system to periodically charge or discharge the battery pack.

11. The motor controller according to claim 10 , further comprising a third module, wherein the third module is configured to: calculate a desired frequency and a desired duty cycle of the periodic driving signal; and adjust a frequency and a duty cycle of the periodic driving signal to the desired frequency and the desired duty cycle.

12. The motor controller according to claim 11 , wherein the third module is configured to: calculate the desired frequency and the desired duty cycle of the periodic driving signal based on a preset desired current threshold range; and adjust the frequency and the duty cycle of the periodic driving signal to the desired frequency and the desired duty cycle.

13. The motor controller according to claim 11 , wherein the third module is configured to: calculate the desired frequency and the desired duty cycle of the periodic driving signal based on a preset desired temperature rise rate range; and adjust the frequency and the duty cycle of the periodic driving signal to the desired frequency and the desired duty cycle.

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Wang Tiancong
• Zuo Xiyang
• Dan Zhimin
• Zheng Xiong
• Li Bao

Classifications

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/443

  in response to temperature · CPC title

• H01M10/633

  characterised by algorithms, flow charts, software details or the like · CPC title