Method for determining the deterioration of a battery

• US 20050001625A1
• Filed: 02/23/2004
• Published: 01/06/2005
• Est. Priority Date: 02/24/2003
• Status: Active Grant

• Current Assignee: FCA US LLC (Stellantis NV)
• Original Assignee: Chrysler Group LLC (Stellantis NV)
• Inventors: Spier, Bernd, Lagerstrom, Rick, Bitsche, Otmar, Ashtiani, Cyrus
• Granted Patent: US 7,554,330 B2
• Time in Patent Office: Days
• 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 the deterioration of a battery,

wherein charge and discharge cycles of the battery are measured by number and depth of the charge/discharge;

a characteristic deterioration value is determined for each of the charge and discharge cycles on the basis of a deterioration curve that is characteristic of the specific battery type; and

individual characteristic deterioration values are summed up to obtain the deterioration of the battery.

2. The method as recited in claim 1,

wherein each partial cycle of charging and each partial cycle of discharging is measured separately, the characteristic deterioration value being determined for each of the partial cycles, and the characteristic deterioration values for all partial cycles being summed up together.

3. The method as recited in claim 1,

wherein the dependence of the characteristic deterioration values on the depth of charge/discharge is permanently defined for the respective battery type by the deterioration curve as a continuous function.

4. The method as recited in claim 1,

wherein the dependence of the characteristic deterioration values on the depth of charge/discharge is permanently defined for the respective battery type by the deterioration curve of approximated intervals with a class width that is adapted to the respective battery type.

5. The method as recited in claim 3 or 4,

wherein the deterioration curve is, at least in individual sections, adapted to the conditions currently prevailing in the region of the battery using weighting factors.

6. The method as recited in claim 5,

wherein the weighting factors are dependent on the temperature.

7. The method as recited in claim 5,

wherein the weighting factors are dependent on the direction and intensity of the charge/discharge current.

8. The method as recited in claim 6,

wherein the weighting factors are dependent on the direction and intensity of the charge/discharge current.

9. The method as recited in claim 2,

wherein the dependence of the characteristic deterioration values on the depth of charge/discharge is permanently defined for the respective battery type by the deterioration curve as a continuous function.

10. The method as recited in claim 2,

wherein the dependence of the characteristic deterioration values on the depth of charge/discharge is permanently defined for the respective battery type by the deterioration curve of approximated intervals with a class width that is adapted to the respective battery type.

11. The method as recited in claim 9 or 10,

wherein the deterioration curve is, at least in individual sections, adapted to the conditions currently prevailing in the region of the battery using weighting factors.

12. The method as recited in claim 11,

wherein the weighting factors are dependent on the temperature.

13. The method as recited in claim 11,

wherein the weighting factors are dependent on the direction and intensity of the charge/discharge current.

14. The method as recited in claim 12,

wherein the weighting factors are dependent on the direction and intensity of the charge/discharge current.

15. The method as recited in claim 1 or 2,

wherein charge/discharge cycles with a capacity throughput below a predetermined limit are not taken into account.

16. The use of the method according to claim 1 or 2 for a battery that is used in a motor vehicle for supplying electric power to electronic auxiliary components.

17. The use of the method according to claim 1 or 2 for a battery that is used in a motor vehicle for supplying electric power to propulsion components.

18. The method as recited in claim 3 or 4,

wherein charge/discharge cycles with a capacity throughput below a predetermined limit are not taken into account.

19. The use of the method according to claim 3 or 4 for a battery that is used in a motor vehicle for supplying electric power to electronic auxiliary components.

20. The use of the method according to claim 3 or 4 for a battery that is used in a motor vehicle for supplying electric power to propulsion components.