SYSTEM AND METHOD FOR DETERMINING STATE OF CHARGE OF A BATTERY
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Abstract
A novel method and system for determining state of charge of a battery (SOC) is disclosed wherein the direct method and the indirect method are not used at the same time, but alternately as indicated by battery current status. The method of the invention compensates for the exiting modeling errors and parameter estimation errors to provide an accurate SOC estimation. The method of the invention computes the DC offset and the battery capacitance to compensate for the exiting modeling errors and parameter estimation errors.
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Citations
35 Claims
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1-14. -14. (canceled)
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15. A method comprising:
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determining a SOC of a battery using a direct method during a first set of one or more conditions of a battery current of the battery; determining the SOC of the battery using an indirect method during a second set of one or more conditions of the battery current of the battery, wherein the second set of one or more conditions of the battery current is different than the first set of one or more conditions of the battery current, and wherein the direct method and the indirect method are not used simultaneously; and after initiation of a system associated with the battery, determining a State of Health (SOH) of the battery and a capacity of the battery using a least square method. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A system comprising:
a processor configured to; determine a State of Charge (SOC) of a battery using a direct method during a first set of one or more conditions of a battery current of the battery; determine the SOC of the battery using an indirect method during a second set of one or more conditions of a current of the battery, wherein the second set of one or more conditions of the current is different than the first set of one or more conditions of the battery current, and wherein the direct method and the indirect method are not used simultaneously; and determine a State of Health (SOH) of the battery and a capacity of the battery using a least square method. - View Dependent Claims (30, 31, 32, 33, 34, 35)
Specification