System and method for multiple battery testing

• US 20070194755A1
• Filed: 02/17/2006
• Published: 08/23/2007
• Est. Priority Date: 02/17/2006
• Status: Abandoned Application

• Current Assignee: SPX Corporation
• Original Assignee: SPX Corporation
• Inventors: Makhija, Surender, Robinson, Dennis, Xia, Weixing, Sparacino, Steve
• Application Number:
  US11/356,250
• Publication Number:
  US 20070194755A1
• Time in Patent Office: Days
• US Class Current: 320/116
• CPC Class Codes: G01R 31/3835 involving only voltage measurements
• CPC Class Codes: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

Abstract

The present invention provides a system and method that enables a user to easily and efficiently determine a battery pack'"'"'s rated current capacity without knowing the configuration of the batteries within the battery pack. Thus, the present invention enables a user to avoid manually calculating the battery pack'"'"'s configuration. Furthermore, in some situations, the present invention enables a user to avoid having to disconnect and individually test the battery pack'"'"'s batteries.

Claims

1. A method for determining a charging characteristic of a battery pack, comprising:

receiving an overall voltage of the battery pack, wherein a plurality of individual batteries is disposed in battery pack;

receiving a number of batteries corresponding to the individual batteries disposed in the battery pack;

receiving an individual battery property common to all individual batteries disposed in the battery pack; and

determining the charging characteristic of the battery pack based on the overall voltage of the battery pack, the number of batteries, and the individual battery property.

2. The method of claim 1, wherein the individual battery property is an individual rated current capacity.

3. The method of claim 1, wherein the battery pack characteristic is an overall battery pack rated current capacity.

4. The method of claim 1, wherein the battery pack characteristic is a configuration of the individual batteries disposed in the battery pack.

5. The method of claim 4, wherein the configuration is a number of parallel connections among the individual batteries

6. The method of claim 4, wherein the configuration is a number of serial connections among the individual batteries.

7. The method of claim 3, further comprising determining a condition of the battery pack.

8. The method of claim 7, wherein determining the condition of the battery pack comprises the steps of determining a measured current output capacity of the battery pack and comparing the measured current output capacity to the overall battery pack rated current capacity.

9. The method of claim 8, wherein the condition of the battery pack is selected from a group consisting of good and faulty.

10. The method of claim 9, wherein the condition of the battery pack is good when the measured current output capacity is proximate to the battery pack rated current capacity.

11. The method of claim 9, wherein the condition of the battery pack is faulty when the measured current output capacity is not proximate to the battery pack rated current capacity.

12. The method of claim 9, further comprising instructing individual testing of the individual batteries disposed in the battery pack when the condition of the battery pack is faulty.

13. The method of claim 12, further comprising instructing disconnection of the individual batteries disposed in the battery pack prior to individual testing when the charging characteristic is a battery pack configuration that includes a number of parallel connections.

14. A system for determining a charging characteristic of a battery pack, comprising:

means for receiving an overall voltage of the battery pack, wherein a plurality of individual batteries is disposed in battery pack;

means for receiving a number of batteries corresponding to the individual batteries disposed in the battery pack;

means for receiving an individual battery property common to all of the individual batteries disposed in the battery pack; and

means for determining the charging characteristic of the battery pack based on the overall voltage of the battery pack, the number of batteries, and the individual battery property.

15. The system of claim 14, wherein the individual battery property is an individual rated current capacity.

16. The system of claim 14, wherein the battery pack characteristic is an overall battery pack rated current capacity.

17. The system of claim 14, wherein the battery pack characteristic is a configuration of the individual batteries disposed in the battery pack, and the configuration specifies a number of parallel connections among the individual batteries

18. The system of claim 14, wherein the battery pack characteristic is a configuration of the individual batteries disposed in the battery pack, and the configuration specifies a number of serial connections among the individual batteries.

19. The system of claim 16, further comprising means for determining a condition of the battery pack.

20. The system of claim 19, wherein the means for determining a condition of the battery pack comprises means for determining a measured current output capacity of the battery pack and means for comparing the measured current output capacity to the overall battery pack rated current capacity.

21. An apparatus for testing a battery pack, comprising:

an input device configured to receive an overall voltage of the battery pack, a number of individual batteries disposed in the battery pack, and an individual current capacity common to the individual batteries disposed in the battery pack; and

a processor configured to determine an overall rated current capacity of the battery pack based on the overall voltage of the battery pack, the number of individual batteries disposed in the battery pack, and the individual current capacity of the individual batteries disposed in the battery pack.

22. The apparatus of claim 21, further comprising:

a first clamp connected to a positive terminal of the battery pack and configured to transmit a first current measurement to the processor; and

a second clamp connected to a negative terminal of the battery pack and configured to transmit a second current measurement to the processor;

wherein, the processor is further configured to determine an overall measured current output capacity of the battery pack based on the first and second current measurements.

23. The apparatus of claim 22, wherein the processor determines a condition of the battery pack by comparing the overall rated current capacity to the overall measured current output capacity.