AGM BATTERY RECOVERY AND CAPACITY TESTER

• US 20110199058A1
• Filed: 02/18/2010
• Published: 08/18/2011
• Est. Priority Date: 02/18/2010
• Status: Abandoned Application

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Farman, Michael Joseph, Shoytush, Paul J.
• Application Number:
  US12/708,477
• Publication Number:
  US 20110199058A1
• Time in Patent Office: Days
• US Class Current: 320/162
• CPC Class Codes: G01R 31/386 using test-loads

Abstract

A system for battery recovery and capacity testing, including a battery charger for charging a battery, a load test resistor and a control relay. The system also includes an electronic controller connected to the battery, load test resistor and the control relay, and further in communication with the battery charger, where the electronic controller controls the battery charger so as to allow the battery to be charged, and also allow the battery to be load tested. The electronic controller calculates the capacity of the battery in ampere-hours at the end of the load testing.

Claims

1. A system for battery capacity testing, said system comprising:

a battery charger for charging a battery;

a load test resistor;

a control relay coupled to the battery, the load test resistor and the battery charger; and

an electronic controller coupled to the battery, load test resistor and the control relay and further in communication with the battery charger, said electronic controller controlling the battery charger so as to allow the battery to be charged, wherein the electronic controller allows the battery to be load tested and calculates the capacity of the battery in ampere-hours at the end of the load testing.

2. The system according to claim 1, further comprising a first lead attached to a first terminal of the battery, a second lead attached to a second terminal of the battery, and a third lead also attached to the second terminal of the battery, wherein the first lead couples the battery to the control relay, the second lead couples the battery to the electronic controller and the load test resistor, and the third lead couples the battery to the battery charger.

3. The system according to claim 1, wherein the battery is an AGM battery.

4. The system according to claim 1, further comprising a selectable voltage switch so as to enable the end condition at the end of the load testing to be any voltage desired.

5. The system according to claim 1, further comprising a selectable current setting so as to allow the battery to be tested at different currents.

6. The system according to claim 1, wherein the battery is charged to approximately 100% state of charge.

7. The system according to claim 1 wherein a load is applied to the battery to remove any surface charge.

8. The system according to claim 1, wherein the battery is load tested with the load test resistor having a selected ohmic resistance until the selected end voltage is achieved.

9. A system for battery capacity testing, said system comprising:

a battery charger for charging a battery;

a load test resistor;

a control relay coupled to the battery, the load test resistor, and the battery charger;

an electronic controller coupled to the battery, load test resistor and the control relay, and further in communication with the battery charger, said electronic controller controlling the battery charger so as to charge the battery to approximately 100% state of charge, and controlling a load applied to the battery to remove any surface charge and determining the open circuit voltage of the battery to allow the battery to be load tested with the load test resistor until the selected end voltage is achieved if the voltage of the battery is determined to be at an acceptable level, and wherein the capacity of the battery is calculated in ampere-hours at the end of the load testing by determining the area under the current decay curve by measuring voltage periodically during load testing; and

a display which displays the state of charge and condition of the battery before testing, during testing and after testing, and further displays the progress of the test.

10. The system according to claim 9, further comprising a first lead attached to a first terminal of the battery, a second lead attached to a second terminal of the battery, and a third lead also attached to the second terminal of the battery, wherein the first lead couples the battery to the control relay, the second lead couples the battery to the electronic controller and the load test resistor, and the third lead couples the battery to the battery charger.

11. The system according to claim 9 wherein determining the area under the current decay curve includes approximating the area under the current decay curve.

12. The system according to claim 11 wherein the area under the current decay curve is approximated using a 5^th order polynomial equation.

13. The system according to claim 9, further comprising a selectable voltage switch so as to enable the test ending condition to be any voltage desired.

14. The system according to claim 9, further comprising a selectable current setting so as to allow the battery to be tested at different currents.

15. The system according to claim 9, wherein the battery is an AGM battery.

16. A system for increasing the capacity of a discharged battery, said system comprising:

a battery charger for charging a battery, said battery charger including a constant current source;

a load test resistor;

a control relay coupled to the battery, the load test resistor and the battery charger; and

an electronic controller coupled to the battery and the battery charger, wherein the controller measures the open circuit voltage of the battery, which is stored in a memory of the controller, and wherein the battery charger charges the battery at a constant current using the constant current source and the battery is then discharged after it is left at open circuit for a desired period of time, where the time elapsed during discharge is measured by the controller and stored in the memory of the controller.

17. The system according to claim 16 wherein the constant current used to charge the battery is about 2 amps for about 24 hours.

18. The system according to claim 16 wherein the controller charges and discharges the battery several times to bring the battery up to, or near, full capacity.

19. The system according to claim 18 wherein the controller records the amount of time required for discharging the battery each time the battery is discharged, and determines whether the battery should be discarded by comparing the discharge times.

20. The system according to claim 16 wherein the battery is discharged to about 9.0 to 10.0 volts.