ON-BOARD STATE OF HEALTH MONITORING OF BATTERIES USING INCREMENTAL CAPACITY ANALYSIS
First Claim
1. A method for monitoring state of health of a battery, comprising:
- defining a model for a battery, where the model relates terminal voltage of the battery to charged capacity of the battery in terms of unknown parameters;
measuring voltage of the battery through a range of states of charge, where the range excludes the battery being fully charged and fully discharged;
determining the unknown parameters of the model by fitting the voltage measures to the model;
determining an incremental capacity curve for the battery by taking derivative of the model; and
quantifying a peak of the incremental capacity curve, thereby determining a state of health for the battery.
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Accused Products
Abstract
A method is provided for determining capacity of a battery. The method includes: defining a model for a battery, where the model relates terminal voltage of the battery to charged capacity of the battery; taking a plurality of voltage measures of the battery, where the voltage measures are taken through a range of states of charge and the range excludes the battery being fully charged and fully discharged; determining the parameters of the model by fitting the plurality of voltage measures to the model; determining an incremental capacity curve for the battery by taking derivative of the model; and quantifying a peak of the incremental capacity curve to thereby determine a capacity of the battery.
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Citations
19 Claims
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1. A method for monitoring state of health of a battery, comprising:
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defining a model for a battery, where the model relates terminal voltage of the battery to charged capacity of the battery in terms of unknown parameters; measuring voltage of the battery through a range of states of charge, where the range excludes the battery being fully charged and fully discharged; determining the unknown parameters of the model by fitting the voltage measures to the model; determining an incremental capacity curve for the battery by taking derivative of the model; and quantifying a peak of the incremental capacity curve, thereby determining a state of health for the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for determining capacity of a battery, comprising:
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defining a model for a battery, where the model relates terminal voltage of the battery to charged capacity of the battery and is defined in accordance with support vector regression; receiving a plurality of voltage measures of the battery, where the voltage measures were taken through a range of states of charge and the range excludes the battery being fully charged and fully discharged; determining the parameters of the model by fitting the plurality of voltage measures to the model; determining an incremental capacity curve for the battery by taking derivative of the model; and quantifying a peak of the incremental capacity curve to thereby determine a capacity of the battery, where the steps of determining the parameters, determining the incremental capacity curve and quantifying the peak are implemented by computer executable instructions executed by a computer processor. - View Dependent Claims (11, 12, 13, 14)
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15. A battery monitoring device, comprising:
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a data store for storing a model for a battery, where the model relates terminal voltage of the battery to charged capacity of the battery and is defined in accordance with support vector regression; a battery monitor interfaced with a battery to measure voltage of the battery through a range of states of charge, where the range excludes the battery being fully charged and fully discharged, the battery monitor determines the parameters of the model by fitting the voltage measures to the model, determines an incremental capacity curve for the battery by taking derivative of the model, and quantifies a peak of the incremental capacity curve to thereby determine a capacity of the battery, wherein the battery monitor is implemented by computer executable instructions executed by a computer processor. - View Dependent Claims (16, 17, 18, 19)
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Specification