Method for determining the deterioration of a battery

• US 7,554,330 B2
• Filed: 02/23/2004
• Issued: 06/30/2009
• Est. Priority Date: 02/24/2003
• Status: Expired due to Fees

• Current Assignee: FCA US LLC (Stellantis NV)
• Original Assignee: Daimler AG (Mercedes-Benz Group AG)
• Inventors: Spier, Bernd, Lagerstrom, Rick, Bitsche, Otmar, Ashtiani, Cyrus
• Primary Examiner(s): Berhane; Adolf
• Assistant Examiner(s): Fantu; Yalkew
• Application Number:
  US10/785,565
• Publication Number:
  US 20050001625A1
• Time in Patent Office: 1,954 Days
• Field of Search: 324/426, 320/132
• US Class Current: 324/426
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• CPC Class Codes: G01R 31/392 Determining battery ageing or deterioration, e.g. state of health
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

This objective is achieved according to the present invention in that in a method for determining the deterioration of a battery, the charge and discharge cycles of the battery are measured by number and depth of the charge/discharge. For each of the charge and discharge cycles, a characteristic deterioration value is determined on the basis of a deterioration curve that is characteristic of the specific battery type. These individual characteristic deterioration values are then summed up to obtain the deterioration of the battery.

Claims

1. A method for determining a deterioration of a battery, comprising:

measuring respective numbers of charge and discharge cycles at a plurality of depths of discharge of the battery;

determining a respective characteristic deterioration value for at least some of the charge and discharge cycles at each of the plurality of depths of discharge using a deterioration curve characteristic of a type of the battery; and

summing the determined characteristic deterioration values so as to obtain the deterioration of the battery;

wherein each respective charge and discharge cycle is a respective partial cycle, the measuring being performed so as to measure the respective partial cycle separately;

wherein the deterioration curve is a continuous function defining a dependence of each characteristic deterioration value on the depth of the respective charge or discharge for the battery type.

2. The method as recited in claim 1 wherein the deterioration curve includes approximated intervals having a class width adapted to the respective battery type, the deterioration curve defining a dependence of a respective characteristic deterioration value on the depth of the respective charge or discharge.

3. The method as recited in claim 1 wherein the deterioration curve is, in at least a section, adapted to a condition currently prevailing in a region of the battery using a weighting factor.

4. The method as recited in claim 3 wherein the weighting factor is dependent on a temperature.

5. The method as recited in claim 3 wherein the weighting factor is dependent on a direction and an intensity of a current of the respective charge or discharge cycle.

6. The method as recited in claim 4 wherein the weighting factor is dependent on a direction and an intensity of a current of the respective charge or discharge cycle.

7. The method as recited in claim 1 wherein the deterioration curve is a continuous function defining a dependence of each characteristic deterioration value on the depth of the respective charge or discharge for the battery type.

8. The method as recited in claim 1 wherein the deterioration curve includes approximated intervals having a class width adapted to the respective battery type, the deterioration curve defining a dependence of a respective characteristic deterioration value on the depth of the respective charge or discharge.

9. The method as recited in claim 1 wherein the deterioration curve is, in at least a section, adapted to a condition currently prevailing in a region of the battery using a weighting factor.

10. The method as recited in claim 9 wherein the weighting factor is dependent on a temperature.

11. The method as recited in claim 9 wherein the weighting factor is dependent on a direction and an intensity of a current of the respective charge or discharge cycle.

12. The method as recited in claim 10 wherein the weighting factor is dependent on a direction and an intensity of a current of the respective charge or discharge cycle.

13. The method as recited in claim 1 wherein the at least some of the charge and discharge cycles does not include charge or discharge cycles having a respective depth of charge or discharge below a predetermined limit.

14. The method as recited in claim 1 wherein the battery is configured to be used in a motor vehicle for supplying electric power to electronic auxiliary components.

15. The method as recited in claim 1 wherein the battery is configured to be used in a motor vehicle for supplying electric power to propulsion components.

16. The method as recited in claim 1 wherein the at least some of the charge and discharge cycles does not include charge or discharge cycles having a respective depth of charge or discharge below a predetermined limit.

17. The method as recited in claim 1 wherein the battery is configured to be used in a motor vehicle for supplying electric power to electronic auxiliary components.

18. The method as recited in claim 1 wherein the battery is configured to be used in a motor vehicle for supplying electric power to propulsion components.