Battery insulation resistance measurement methods, insulation resistance measurement methods, insulation resistance determination apparatuses, and articles of manufacture

• US 9,581,652 B2
• Filed: 03/15/2013
• Issued: 02/28/2017
• Est. Priority Date: 11/19/2009
• Status: Active Grant

• Current Assignee: Lithion Battery Incorporated
• Original Assignee: Valence Technology Incorporated (Lithium Werks B.V.)
• Inventors: Klijn, Aaron
• Primary Examiner(s): WILLIAMS, ARUN C
• Application Number:
  US13/834,681
• Publication Number:
  US 20130214788A1
• Time in Patent Office: 1,446 Days
• Field of Search: 324/430
• US Class Current: 1/1
• CPC Class Codes: G01R 27/025 Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
• CPC Class Codes: G01R 27/18 Measuring resistance to earth , i.e. line to ground
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• CPC Class Codes: G01R 31/3835 involving only voltage measurements
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Battery insulation resistance measurement methods, insulation resistance measurement methods, insulation resistance determination apparatuses, and articles of manufacture are described. According to one aspect, a battery insulation resistance measurement method includes determining a voltage of a battery, determining a voltage of a first terminal of the battery with respect to a ground reference, determining a voltage of a second terminal of the battery with respect to the ground reference, and using the voltages of the battery, the first terminal and the second terminal, determining an insulation resistance of the battery with respect to the ground reference.

Claims

1. An insulation resistance measurement apparatus comprising:

processing circuitry configured to access a voltage of a battery with respect to a ground reference, to access a voltage of a first terminal of the battery with respect to the ground reference, to access a voltage of a second terminal of the battery with respect to the ground reference, and to determine an insulation resistance of the first terminal with respect to the ground reference using the voltage of the battery with respect to the ground reference, the voltage of the first terminal of the battery with respect to the ground reference, and the voltage of the second terminal of the battery with respect to the ground reference.

2. The apparatus of claim 1 wherein the processing circuitry is configured to determine an insulation resistance of the second terminal with respect to the ground reference.

3. The apparatus of claim 2 wherein the processing circuitry is configured to determine an insulation resistance of the battery with respect to the ground reference using the insulation resistances of the first and second terminals.

4. The apparatus of claim 3 wherein the processing circuitry is configured to determine the insulation resistance of the battery comprising the parallel equivalent resistance of the insulation resistances of the first and second terminals.

5. The apparatus of claim 1 wherein the processing circuitry is configured to access the voltage of the first terminal with a known resistance coupled with the second terminal and the ground reference and to access the voltage of the second terminal with a known resistance coupled with the first terminal and the ground reference.

6. The apparatus of claim 5 wherein the processing circuitry is configured to use the known resistance to determine the insulation resistance.

7. The apparatus of claim 1 further comprising known resistance circuitry configured to couple a known resistance with the first terminal during the accessing of the voltage of the second terminal and to couple a known resistance with the second terminal during the accessing of the voltage of the first terminal.

8. A battery insulation resistance measurement method performed using circuitry of an insulation resistance measurement apparatus, the method comprising:

determining a first voltage of a first terminal of a battery;

determining a first voltage of a second terminal of the battery;

determining a voltage of the battery using the first voltages of the first and second terminals;

determining a second voltage of the first terminal with a resistance coupled with the second terminal;

determining a second voltage of the second terminal with a resistance coupled with the first terminal;

determining, using the insulation resistance measurement apparatus, an insulation resistance of the battery using the voltage of the battery and the second voltages of the first and second terminals;

de-coupling the resistance from the second terminal after the determining the second voltage of the first terminal;

de-coupling the resistance from the first terminal after the determining the second voltage of the second terminal;

wherein the determining the second voltage of the first terminal comprises determining with the resistance de-coupled from the first terminal and the determining the second voltage of the second terminal comprises determining with the resistance de-coupled from the second terminal;

monitoring the insulation resistance of the battery with respect to a threshold; and

initiating an alarm as a result of the monitoring.

9. The method of claim 8 wherein the determining the voltage of the battery comprises summing the first voltages of the first and second terminals after the determining the first voltages of the first and second terminals.

10. The method of claim 8 wherein the determining the insulation resistance comprises determining the insulation resistance for at least one of the first and the second terminals.

11. The method of claim 8 wherein the determining the insulation resistance comprises determining the insulation resistance for both of the first and the second terminals.

12. The method of claim 8 wherein the determining the insulation resistance comprises determining the insulation resistance of the battery using the insulation resistances of the first and second terminals.

13. The method of claim 8 wherein the determinings of the first voltages of the first and second terminals individually comprise determining without the resistance coupled with the other of the first and second terminals.

14. The method of claim 8 further comprising coupling different resistances with respective ones of the first and second terminals during the respective determinings of the first voltages of the first and second terminals, and de-coupling the different resistances from the first and second terminals after the determinings of the first voltages of the first and second terminals.

15. An insulation resistance measurement method performed using circuitry of an insulation resistance measurement apparatus, the method comprising:

determining a voltage of a battery;

measuring a voltage of a first terminal of the battery with a resistance coupled with a second terminal of the battery, the second terminal having an electrical polarity which is opposite to an electrical polarity of the first terminal;

measuring a voltage of the second terminal of the battery with a resistance coupled with the first terminal of the battery;

determining, using the insulation resistance measurement apparatus, an insulation resistance of one of the first and second terminals of the battery using the voltage of the battery, the voltage of the first terminal of the battery, and the voltage of the second terminal of the battery;

monitoring the insulation resistance of the one of the first and second terminals of the battery with respect to a threshold; and

initiating an alarm as a result of the monitoring.

16. The method of claim 15 further comprising determining an insulation resistance of another of the first and second terminals of the battery using the voltage of the battery, the voltage of the first terminal of the battery, and the voltage of the second terminal of the battery.

17. The method of claim 16 further comprising determining an insulation resistance of the battery using the insulation resistances of the first and second terminals.

18. A battery insulation resistance measurement method performed using circuitry of an insulation resistance measurement apparatus, the method comprising:

determining a first voltage of a first terminal of a battery;

determining a first voltage of a second terminal of the battery;

determining a voltage of the battery using the first voltages of the first and second terminals;

determining a second voltage of the first terminal with a resistance coupled with the second terminal;

determining a second voltage of the second terminal with a resistance coupled with the first terminal;

determining, using the insulation resistance measurement apparatus, an insulation resistance of the battery using the voltage of the battery and the second voltages of the first and second terminals;

coupling different resistances with respective ones of the first and second terminals during the respective determinings of the first voltages of the first and second terminals, and de-coupling the different resistances from the first and second terminals after the determinings of the first voltages of the first and second terminals;

monitoring the insulation resistance of the battery with respect to a threshold; and

initiating an alarm as a result of the monitoring.