System and method for resonant heating battery

Patent metadata

Field	Value
Publication number	US-11757147-B2
Application number	US-202117146802-A
Country	US
Kind code	B2
Filing date	Jan 12, 2021
Priority date	Jan 12, 2021
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

A vehicle includes an electric machine, a battery, an inverter, and a controller. The controller switches the inverter at a switching frequency selected to generate an AC current to heat the battery, adjusts a d-axis current of the electric machine to increase a battery heating power, and adjusts a q-axis current of the electric machine according to the adjusted d-axis current.

First claim

What is claimed is:

1. A vehicle comprising:
an electric machine;
a battery;
an inverter coupled between the electric machine and the battery; and
a controller programmed to switch the inverter at a switching frequency selected to generate an AC current to heat the battery, adjust a d-axis current of the electric machine to increase a battery heating power without changing the switching frequency selected to generate the AC current to heat the battery, and adjust a q-axis current of the electric machine according to the adjusted d-axis current such that the q-axis current is non-zero when the electric machine rotates.

2. The vehicle of claim 1 , wherein the d-axis current and the q-axis current are a function of torque demand.

3. The vehicle of claim 1 , wherein the q-axis current is proportional to torque demand.

4. The vehicle of claim 1 , wherein the controller is further programmed to switch the inverter at the switching frequency selected to generate the AC current to heat the battery responsive to receiving a torque demand and a temperature of the battery being less than a threshold.

5. The vehicle of claim 1 , wherein the controller is further programmed to adjust the d-axis current of the electric machine without changing the switching frequency selected to generate the AC current to heat the battery responsive to a heating power resulting from the AC current being less than a heating power requirement.

6. The vehicle of claim 5 , wherein the heating power requirement is a function of a target temperature and a temperature of the battery.

7. The vehicle of claim 5 , wherein the heating power is a function of a speed of the vehicle.

8. A method comprising:
responsive to a traction battery temperature being less than a threshold, switching an inverter operatively arranged with the traction battery at a switching frequency selected to generate heating power for the traction battery; and
responsive to the heating power being less than a required heating power, adjusting a d-axis current of an electric machine operatively arranged with the inverter to increase the heating power towards the required heating power, and adjusting a q-axis current according to the adjusted d-axis current such that the q-axis current is non-zero when the electric machine rotates.

9. The method of claim 8 , wherein the d-axis current is adjusted without changing the switching frequency selected to generate the heating power.

10. The method of claim 8 , wherein the d-axis current and the q-axis current are a function of torque demand.

11. The method of claim 8 , wherein the q-axis current is proportional to torque demand.

12. The method of claim 8 , wherein the required heating power is a function of a target temperature and a temperature of the traction battery.

13. A power system comprising:
a fuel cell;
an inverter operatively arranged with the fuel cell; and
a controller programmed to switch the inverter at a switching frequency selected to generate heating power for the fuel cell, adjust a d-axis current to increase the heating power, and adjust a q-axis current according to the adjusted d-axis current such that the q-axis current is non-zero when an electric machine rotates.

14. The power system of claim 13 , wherein the controller is further programmed to adjust the d-axis current without changing the switching frequency selected to generate heating power for the fuel cell.

15. The power system of claim 13 , wherein the d-axis current and the q-axis current are a function of torque demand.

16. The power system of claim 13 , wherein the q-axis current is proportional to torque demand.

17. The power system of claim 13 , wherein the controller is further programmed to switch the inverter at the switching frequency selected to generate heating power for the fuel cell responsive to receiving a torque demand and a temperature of the fuel cell being less than a threshold.

18. The power system of claim 13 , wherein the controller is further programmed to adjust the d-axis current responsive to the heating power being less than a heating power requirement.

Assignees

• Ford Global Tech Llc

Inventors

• Xu Yang
• Wang Jiyao
• Li Silong
• Kimmel Joseph Sherman
• Degner Michael W

Classifications

• B60L58/27 Primary

  by heating · CPC title

• H02P21/22 Primary

  Current control, e.g. using a current control loop · CPC title

• H01M10/637 Primary

  characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching (means for preventing undesired use or discharge H01M50/572) · CPC title

• B60L58/34

  by heating · CPC title

• B60L15/007

  Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles · CPC title