STATE OF CHARGE DETERMINATION SYSTEMS AND METHODS

• US 20120249086A1
• Filed: 03/28/2011
• Published: 10/04/2012
• Est. Priority Date: 03/28/2011
• Status: Active Grant

• Current Assignee: Changs Ascending Enterprise Co., Ltd.
• Original Assignee: Changs Ascending Enterprise Co., Ltd.
• Inventors: Chang, Chun-Chieh, Chang, Tsun Yu
• Granted Patent: US 9,347,997 B2
• Time in Patent Office: Days
• US Class Current: 320/164
• CPC Class Codes: G01R 31/3842 combining voltage and current measurements

Abstract

In one embodiment, a method implemented by a processor, comprising receiving voltage values corresponding to a battery system, receiving charge values corresponding to charge flowing through the battery system, and determining a state of charge based on specified anchoring points of a charge integration, the anchoring points based on the received voltage and time.

Claims

1. A method, comprising:

receiving, by a processor, voltage values corresponding to a battery system;

receiving, by the processor, charge values corresponding to charge flowing through the battery system; and

determining, by the processor, a state of charge based on specified anchoring points of a charge integration, the anchoring points based on the received voltage and time.

2. The method of claim 1, wherein the anchoring points are further based on current flowing through the battery system, the current determined based on the charge and the time.

3. The method of claim 1, further comprising updating a capacity of the battery system based on the charge integration between two of the anchoring points.

4. The method of claim 3, wherein determining further comprises comparing an integrated charge change and the updated capacity.

5. The method of claim 3, further comprising triggering the updating during a charging process corresponding to the battery system.

6. The method of claim 3, further comprising triggering the updating during a discharging process corresponding to the battery system.

7. The method of claim 3, further comprising triggering the updating based on a defined period of time between the anchoring points in which the charge integration occurs.

8. The method of claim 3, further comprising triggering the updating based on a magnitude of current attained when at least one of the anchoring points is reached.

9. The method of claim 3, further comprising triggering the updating based on when one of the anchoring points is reached.

10. The method of claim 1, wherein the anchoring points are specified by a defined quantity of repetition of conditions based on voltage and time or voltage, time, and current.

11. A state of charge determination system, comprising:

battery voltage sensing logic configured to sense voltage of a battery system;

shunt voltage sensing logic configured to sense charge flowing through the battery system; and

a processor configured to;

receive values corresponding to the sensed voltage and charge;

specify anchoring points of a charge integration, the anchoring points based on the sensed voltage, time, and current; and

determine a state of charge based on the specified anchoring points.

12. The system of claim 11, wherein the processor is configured to specify the anchoring points based on a defined quantity of repetition of conditions based on voltage, time, and current.

13. The system of claim 11, wherein the processor is further configured to update a capacity of the battery system based on integrating the charge between two of the anchoring points.

14. The system of claim 13, wherein the processor is further configured to determine by comparing an integrated charge change and the updated capacity.

15. The system of claim 13, wherein the processor is further configured to trigger the update during either a charging process or a discharging process corresponding to the battery system.

16. The system of claim 13, wherein the processor is further configured to trigger the update based on one or more of a defined period of time between the anchoring points in which the charge integration occurs, a magnitude of current attained when at least one of the anchoring points is reached, or when one of the anchoring points is reached.

17. The system of claim 11, further comprising a display, wherein the processor is further configured to provide to the display:

a certain displayed state of charge value if the charge integration comprises a charge count that exceeds a certain value corresponding to the state of charge before a high anchoring point is reached while continuing the charge integration;

or

another displayed state of charge based on a determined new reference point for the state of charge if the charge integration comprises a charge count that does not exceed the certain value and the high anchoring point is reached.

18. The system of claim 11, further comprising a display, wherein the processor is further configured to provide to the display:

a low state of charge value if the charge integration decreases below a certain value before a low anchoring point is reached while continuing the charge integration;

or

the low state of charge value if the charge integration does not decrease below the certain value and the low anchoring point is reached, wherein the processor is further configured to continue the charge integration under new constraints.

19. A system, comprising:

means for receiving voltage values corresponding to a battery system;

means for receiving charge values corresponding to charge flowing through the battery system;

means for determining a state of charge based on specified anchoring points of a charge integration, the anchoring points based on either the received voltage values and time, the received voltage values, time, and current, or the repetition of certain number of times in conditions with parameters specified by voltage, time, or voltage, time, and current; and

means for providing for display, the display comprising;

a certain displayed state of charge value if the charge integration comprises a charge count that exceeds a certain value corresponding to the state of charge before a high anchoring point is reached while continuing the charge integration;

or

another displayed state of charge based on a determined new reference point for the state of charge if the charge integration comprises a charge count that does not exceed the certain value and the high anchoring point is reached.

20. The system of claim 19, wherein the display further comprises:

a low state of charge value if the charge integration decreases below a defined certain value before a low anchoring point is reached while continuing the charge integration;

or

the low state of charge value if the charge integration does not decrease below the defined certain value and the low anchoring point is reached, wherein the processor is further configured to continue the charge integration under new constraints.