Method for Managing a Pool or Rechargeable Batteries

• US 20070222418A1
• Filed: 06/06/2005
• Published: 09/27/2007
• Est. Priority Date: 06/14/2004
• Status: Active Grant

• Current Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Original Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Inventors: Bach, Olivier, Benchetrite, Daniel, Le Gall, Murielle
• Granted Patent: US 7,663,344 B2
• Time in Patent Office: Days
• US Class Current: 320/136
• CPC Class Codes: G01R 19/16542 for batteries charge condition monitoring in G01R31/36
• CPC Class Codes: G01R 31/379 for lead-acid batteries
• CPC Class Codes: G01R 31/392 Determining battery ageing or deterioration, e.g. state of health
• CPC Class Codes: H01M 10/4207 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The management of a pool of batteries is an intelligent management taking account of the state of health of all the batteries of the pool and of the evolution thereof with time. The method for managing includes determination of priority criteria and charging of a battery selected according to the priority criteria. After the selected battery has been charged, electrical parameters representative of the battery are measured, then the state of health of the selected battery is analyzed according to the measured electrical parameters. The priority criteria are then updated according to the state of health of the battery. Selection of the next battery to be recharged is performed according to the updated priority criteria. The measured parameters used for analyzing the state of health are preferably representative of a coup de fouet effect during a partial discharge of a fully charged battery.

Claims

1. Method for managing a pool of rechargeable batteries comprising determination of priority criteria, charging of a battery selected according to the priority criteria, and measurement of electrical parameters representative of said battery, said method comprising analysis of the state of health of the selected battery according to said electrical parameters measured after the selected battery has been fully charged, updating of the priority criteria according to the state of health of said battery, and selection of the next battery according to the updated priority criteria.

2. Method according to claim 1, wherein the analysis of the state of health of the selected battery comprises comparison of the electrical parameters of the selected battery, measured after said battery has been charged, with preset thresholds.

3. Method according to claim 1, wherein the analysis of the state of health of the selected battery comprises detection of a break in the evolution of the electrical parameters of the selected battery, measured during a preset period after the battery has been charged.

4. Method according to claim 1, wherein the measurement of the electrical parameters of the selected battery comprises measurement of the impedance of said battery.

5. Method according to claim 1, wherein the measurement of the electrical parameters of the selected battery comprises measurement of the conductance of said battery.

6. Method according to claim 1, wherein the measurement of the electrical parameters of the selected battery comprises measurement of the resistance of said battery.

7. Method according to claim 1, wherein the measurement of the electrical parameters of the selected battery comprises measurement of the voltage at the terminals of said battery during a partial discharge at constant current.

8. Method according to claim 7, wherein the measurement of the electrical parameters comprises measurement of parameters representative of a coup de fouet effect during the partial discharge.

9. Method according to claim 8, wherein the measurement of parameters representative of a coup de fouet effect comprises determination of a peak voltage during the partial discharge.

10. Method according to claim 8, wherein the measurement of parameters representative of a coup de fouet effect comprises determination of a plateau voltage during the partial discharge.

11. Method according to claim 8, wherein the measurement of parameters representative of a coup de fouet effect comprises determination of the difference between the values of a peak voltage and of a plateau voltage reached by the voltage of the selected battery respectively during first and second phases of the partial discharge.

12. Method according to claim 8, comprising modification of the charging criteria of the selected battery in the absence of coup de fouet effect during the partial discharge.