METHOD AND APPARATUS FOR PREDICTING CHANGE IN AN OPERATING STATE OF AN ELECTRIC ENERGY STORAGE DEVICE

• US 20070285097A1
• Filed: 06/07/2006
• Published: 12/13/2007
• Est. Priority Date: 06/07/2006
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (General Motors Company)
• Inventors: Zettel, Andrew M., Heap, Anthony H.
• Granted Patent: US 7,639,018 B2
• Time in Patent Office: Days
• US Class Current: 324/426
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 2240/429 Current
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 2240/80 Time limits
• CPC Class Codes: B60L 2260/42 by adaptive correction
• CPC Class Codes: B60L 2260/46 by self learning
• CPC Class Codes: B60L 2260/50 by future state prediction
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/16 responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
• CPC Class Codes: H01M 10/42 Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells H01M10/60 takes precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A method for predicting change in an operating state, e.g. state of life, for an electrical energy storage device includes establishing a plurality of values for an operating parameter, e.g. current, of the electrical energy storage device and, for each respective value, determining a corresponding change in the operating state for the energy storage device based upon the respective value. Preferably, change in the state of life is determined based upon an integration of electrical current, a depth of discharge of the energy storage device, and an operating temperature factor of the electrical energy storage device.

Claims

1. Method for predicting change in an operating state for an electrical energy storage device, comprising:

establishing a plurality of values for an operating parameter of the electrical energy storage device; and

for each respective value, determining a corresponding change in the operating state for the energy storage device based upon said respective value.

2. The method of claim 1, wherein the operating state of the electrical energy storage device comprises a state of life.

3. The method of claim 2, wherein the operating parameter of the electrical energy storage device comprises electrical current.

4. The method of claim 3, wherein change in the state of life is determined based upon an integration of electrical current, a depth of discharge of the energy storage device, and, an operating temperature factor of the electrical energy storage device.

5. The method of claim 4, wherein the depth of discharge of the electrical energy storage device is determined based upon the electrical current.

6. The method of claim 4, wherein the operating temperature factor of the electrical energy storage device is determined based upon the electrical current and temperature of the electrical energy storage device.

7. Method for predicting change in state of life of an electrical energy storage device, comprising:

providing a plurality of potential currents for the electrical energy storage device; and

for each potential current, predicting a respective effect upon electrical energy storage device state of life.

8. The method of claim 7 wherein predicting effects upon electrical energy storage device state of life comprises predicting changes in the state of life based on at least one factor affected by electrical energy storage device current.

9. The method of claim 8 wherein said at least one factor affected by electrical energy storage device current comprises a factor related to current integration over time.

10. The method of claim 8 wherein said at least one factor affected by electrical energy storage device current comprises a factor related to depth of discharge of the electrical energy storage device.

11. The method of claim 8 wherein said at least one factor affected by electrical energy storage device current comprises a factor related to temperature of the electrical energy storage device.

12. Apparatus for predicting change in state of life of an electrical energy storage device, comprising:

a current sensor adapted for sensing current through the energy storage device; and

a computer based controller adapted to receive a signal indicative of sensed energy storage device current;

said computer based controller including a storage medium having a computer program encoded therein, said computer program comprising;

code for providing a plurality of potential currents for the electrical energy storage device; and

code for predicting a respective effect upon electrical energy storage device state of life for each potential current.

13. The apparatus of claim 12 wherein the code for predicting effects upon electrical energy storage device state of life comprises predicting changes in the state of life based on at least one factor affected by electrical energy storage device current.

14. The apparatus of claim 13 wherein said at least one factor affected by electrical energy storage device current comprises a factor related to current integration over time.

15. The apparatus of claim 13 wherein said at least one factor affected by electrical energy storage device current comprises a factor related to depth of discharge of the electrical energy storage device.

16. The apparatus of claim 13 wherein said at least one factor affected by electrical energy storage device current comprises a factor related to temperature of the electrical energy storage device.