Battery charging system and method of operating same

• US 7,642,748 B2
• Filed: 10/19/2005
• Issued: 01/05/2010
• Est. Priority Date: 10/19/2005
• Status: Active Grant

• Current Assignee: GE Energy Power Conversion Technology Limited (General Electric Company)
• Original Assignee: General Electric Company
• Inventors: Bonneau, William John, Glosser, Richard Joseph Jr., Meyer, Brian Nedward
• Primary Examiner(s): Tso; Edward
• Assistant Examiner(s): DIAO, M BAYE
• Application Number:
  US11/253,933
• Publication Number:
  US 20070090797A1
• Time in Patent Office: 1,539 Days
• Field of Search: 320/116, 320/117, 320/118, 320/119, 320/122, 320/134, 320/138, 320/121
• US Class Current: 320/116
• CPC Class Codes: G01R 31/386 using test-loads
• CPC Class Codes: H02J 7/0018 using separate charge circuits
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A method for charging a plurality of batteries wherein each battery includes an anode and a cathode. The method includes electrically coupling n batteries to form a string of batteries, electrically coupling n battery charger assemblies to the n batteries such that each respective battery charger assembly is coupled to an anode and a cathode of a respective battery, and charging the plurality of batteries utilizing the n battery charger assemblies.

Claims

1. A method for charging a plurality of batteries wherein each battery includes an anode and a cathode, said method comprising:

electrically coupling n batteries to form a string of batteries, the n batteries including at least a first battery and a second battery;

electrically coupling n battery charger assemblies to the n batteries such that each respective battery charger assembly is coupled to an anode and a cathode of a single respective battery, the n battery charger assemblies including at least a first battery charger assembly coupled to the first battery and a second battery charger assembly coupled to the second battery;

charging the n batteries utilizing the n battery charger assemblies;

placing a first predetermined load across the first battery using the first battery charger assembly;

placing a second predetermined load across the second battery using the second battery charger assembly;

determining at the first battery charger assembly whether the first battery is operating within predetermined limits based on the first predetermined load; and

determining at the second battery charger assembly whether the second battery is operating within the predetermined limits based on the second predetermined load.

2. A method in accordance with claim 1 wherein electrically coupling n batteries to form a string of batteries further comprises electrically coupling n batteries in series to form a series string of batteries.

3. A method in accordance with claim 1 wherein each battery charger assembly includes a customizable battery charging profile, said method further comprising charging each battery of the n batteries using a respective charging profile.

4. A method in accordance with claim 1 wherein each battery charger assembly includes a microprocessor and a battery charging profile stored within the microprocessor, the method further includes operating the first and second battery charger assemblies based on the stored battery charging profiles to charge the respective first and second batteries.

5. A method in accordance with claim 1 wherein each battery charging assembly includes a power input stage and a power rectification stage including a first silicon controlled rectifier and a second silicon controlled rectifier that are each electrically coupled to the power input stage, said method further comprising operating the first and second silicon controlled rectifiers to channel electrical current from the power input stage to a respective battery of the n batteries.

6. A method in accordance with claim 1 wherein each battery charging assembly includes a battery testing stage, said method further comprising operating the battery testing stages to determine whether each respective battery is maintaining a predetermined voltage.

7. A battery charging system comprising:

a first battery charger assembly coupled in parallel with a first battery, the first battery charger comprising a first battery testing stage configured to monitor measurements of the first battery and to determine whether the first battery is operating within predetermined limits based on the measurements of the first battery; and

a second battery charger assembly coupled in parallel with a second battery, the second battery charger comprising a second battery testing stage configured to monitor measurements of the second battery and to determine whether the second battery is operating within the predetermined limits based on the measurements of the second battery, the first and second batteries electrically coupled to form a string of batteries.

8. A battery charging system in accordance with claim 7 further comprising n≧

3 battery charger assemblies that are each electrically coupled in parallel to a respective battery.

9. A battery charger system in accordance with claim 7 wherein the first and second batteries are coupled in series to form a series string of batteries.

10. A battery charging system in accordance with claim 7 wherein said first and second battery charger assemblies each comprise:

a microprocessor; and

a battery charging profile stored within the microprocessor, said first and second battery charger assemblies configured to charge the first and second batteries according to the respective battery charging profile.

11. A battery charging system in accordance with claim 7 wherein said first and second battery charger assemblies each comprise:

a power input stage;

a power rectification stage comprising a first silicon controlled rectifier and a second silicon controlled rectifier that are each electrically coupled to said power input stage.

12. A battery charging system in accordance with claim 11 wherein said first and second battery charger assemblies each further comprise a power output measurement stage electrically coupled to said first and second silicon controlled rectifiers and configured to operate said first and second silicon controlled rectifiers to channel electrical current from said power input stage to the first and second batteries.

13. A battery charger system in accordance with claim 7 wherein said first battery testing stage and said second battery testing stage are each configured to at least one of receive a predetermined charging current and maintain a predetermined charge.

14. A battery charger system in accordance with claim 7 further comprising a communication link coupled between said first and second battery charger assemblies and an external user to facilitate transmitting data from said first and second battery charger assemblies to the external user.

15. A wind turbine comprising:

a rotor having at least one blade operatively coupled to at least one pitch motor; and

a battery charging system comprising;

a first battery charger assembly coupled in parallel with a first battery, the first battery charger assembly configured to determine whether the first battery is operating within predetermined limits based on measurements of the first battery; and

a second battery charger assembly coupled in parallel with a second battery, the second battery charger assembly configured to determine whether the second battery is operating within the predetermined limits based on measurements of the second battery, the first and second batteries electrically coupled to form a string of batteries that is coupled to the at least one pitch motor.

16. A wind turbine in accordance with claim 15 wherein said battery charging system further comprises n≧

3 battery charger assemblies that are each electrically coupled in parallel to a respective battery.

17. A wind turbine in accordance with claim 15 wherein the first and second batteries are coupled in series to form a series string of batteries.

18. A wind turbine in accordance with claim 15 wherein said first and second battery charger assemblies each comprise:

a microprocessor; and

a battery charging profile stored within the microprocessor, said first and second battery charger assemblies configured to charge the first and second batteries according to the respective battery charging profile.

19. A wind turbine in accordance with claim 15 wherein said first and second battery charger assemblies each comprise:

a power input stage;

a power rectification stage comprising a first silicon controlled rectifier and a second silicon controlled rectifier that are each electrically coupled to said power input stage;

a power output measurement stage electrically coupled to said first and second silicon controlled rectifiers and configured to operate said first and second silicon controlled rectifiers to channel electrical current from said power input stage to a respective battery of the first and second batteries; and

a battery testing stage to determine whether each of the first and second batteries is operating within the predetermined limits.

20. A wind turbine in accordance with claim 15 further comprising a communication link coupled between said first and second battery charger assemblies and an external user to facilitate transmitting data from said first and second battery charger assemblies to the external user.