Battery fuel gauge
First Claim
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1. A method for estimating a battery state of charge (SoC) of a battery comprising:
- a processor providing a representation of a battery model, the battery model comprising an open circuit voltage (OCV) component and an equivalent series resistance (Rseries) component;
the processor acquiring a current measurement of the battery;
the processor acquiring a voltage measurement of the battery;
the processor computing a present estimate of the battery SoC using the current measurement, the voltage measurement, and a previous estimate of a battery voltage produced from an evaluation of the battery model;
the processor evaluating the battery model to compute a present estimate of the battery voltage using at least a value of the OCV component and a voltage of the Rseries component; and
the processor updating a value of the Rseries component when a condition is met, including acquiring at least a measurement of the voltage of the battery and using the measurement to compute an updated value of the Rseries component.
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Abstract
A system for estimating battery state of charge (SoC) includes evaluating a battery model to produce an estimated battery voltage using a previously produced SoC. Current and voltage measurements are combined with the estimated battery voltage to produce a present battery SoC. The battery model may be updated by taking battery measurements when certain conditions occur.
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Citations
20 Claims
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1. A method for estimating a battery state of charge (SoC) of a battery comprising:
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a processor providing a representation of a battery model, the battery model comprising an open circuit voltage (OCV) component and an equivalent series resistance (Rseries) component; the processor acquiring a current measurement of the battery; the processor acquiring a voltage measurement of the battery; the processor computing a present estimate of the battery SoC using the current measurement, the voltage measurement, and a previous estimate of a battery voltage produced from an evaluation of the battery model; the processor evaluating the battery model to compute a present estimate of the battery voltage using at least a value of the OCV component and a voltage of the Rseries component; and the processor updating a value of the Rseries component when a condition is met, including acquiring at least a measurement of the voltage of the battery and using the measurement to compute an updated value of the Rseries component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system to estimate battery SoC of a battery comprising:
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a current sensor to sense current flow in a battery; a voltage sensor to sense a voltage of the battery; a representation of a battery model, the battery model comprising an open circuit voltage (OCV) component and an equivalent series resistance (Rseries) component, wherein evaluation of the battery model produces an estimated battery voltage; and circuitry to compute a present value of battery SoC based on the current flow in the battery, the voltage of the battery, and the estimated battery voltage, wherein the estimated battery voltage is based at least on a value of the OCV component and a voltage of the Rseries component, wherein a value of the Rseries component is updated when a condition is met, including the voltage sensor acquiring a measurement of the voltage of the battery and using the measurement of the voltage of the battery to compute an updated value of the Rseries component. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A circuit to estimate battery SoC of a battery comprising:
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battery measurement means for acquiring a measure of current flow in a battery and a measure of a voltage of the battery; a battery voltage estimation means for computing an estimated battery voltage of the battery based on a model of the battery, the model of the battery including an open circuit voltage (OCV) component and an equivalent series resistance (Rseries) component; a SoC estimation means for computing an estimate of battery SoC using the measure of current flow, the measure of voltage, and a previous estimate of a battery voltage produced by the battery model; and updating means for updating a value of the Rseries component when a condition is met, including using a measure of the voltage of the battery and a measure of current flow in the battery to compute an updated value of the Rseries component. - View Dependent Claims (17, 18, 19, 20)
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Specification