Method of estimating battery state of charge
First Claim
1. A machine implemented method for estimating the state of charge of a battery, the machine implemented method comprising:
- providing a measured cell terminal voltage and an estimated cell terminal voltage to a model coefficient updater;
updating a model coefficient by utilizing the measured cell terminal voltage and estimated cell terminal voltage;
providing battery current and measured cell terminal voltage to a battery state of charge estimator;
providing the updated model coefficient to the battery state of charge estimator, anddetermining an estimated state of charge of the battery and an estimated cell terminal voltage by utilizing the updated model coefficient, the battery current information, and the measured cell terminal voltage,wherein the method is implemented on a processing device, and the battery comprises at least one positive electrode and one negative electrode.
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Abstract
The present teachings are directed toward a machine implemented method for estimating the state of charge of a battery. The machine implemented method includes providing measured and estimated cell terminal voltage to a model coefficient updater to update a model coefficient. Battery current information is provided to a battery state of charge estimator along with the updated model coefficient so that the estimated state of charge can be determined. A multi-layer model can be utilized to determine the states of charge for layers of the electrodes. The method can be implemented on a processing device, and is particularly applicable to Li-ion batteries.
31 Citations
20 Claims
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1. A machine implemented method for estimating the state of charge of a battery, the machine implemented method comprising:
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providing a measured cell terminal voltage and an estimated cell terminal voltage to a model coefficient updater; updating a model coefficient by utilizing the measured cell terminal voltage and estimated cell terminal voltage; providing battery current and measured cell terminal voltage to a battery state of charge estimator; providing the updated model coefficient to the battery state of charge estimator, and determining an estimated state of charge of the battery and an estimated cell terminal voltage by utilizing the updated model coefficient, the battery current information, and the measured cell terminal voltage, wherein the method is implemented on a processing device, and the battery comprises at least one positive electrode and one negative electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A battery management device comprising:
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a battery having positive and negative electrodes; a battery charger for charging the battery; and a charging control system comprising a machine implemented method for determining the state of charge of either electrode of the battery, the machine implemented method comprising; providing a measured cell terminal voltage and an estimated cell terminal voltage to a model coefficient updater; updating a model coefficient by utilizing the measured cell terminal voltage and estimated cell terminal voltage; providing battery current information and measured cell terminal voltage to a battery state of charge estimator; providing the updated model coefficient to the battery state of charge estimator; and determining an estimated state of charge of the battery and an estimated cell terminal voltage by utilizing the updated model coefficient, the battery current information, and the measured cell terminal voltage, wherein the method is implemented on a processing device. - View Dependent Claims (17, 18, 19, 20)
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Specification