DETERMINING THE STATE OF-CHARGE OF BATTERIES VIA SELECTIVE SAMPLING OF EXTRAPOLATED OPEN CIRCUIT VOLTAGE
First Claim
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1. A method of determining a state-of-charge of a battery within a system powered at least in part by the battery comprising:
- collecting a plurality of voltage measurements during operation of the system;
determining a time-constant of relaxation and an open-circuit voltage corresponding to the battery based, at least in part, on the voltage measurements and using a mathematical model of the battery that relates the voltage measurements to the open-circuit voltage and the time-constant of relaxation; and
,estimating the state-of-charge of the battery based, at least in part, on the open-circuit voltage.
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Abstract
A method for estimating the state-of-charge of a battery. The method includes collecting a plurality of voltage measurements during operation of the system containing the battery and determining a time-constant of relaxation and an open-circuit voltage corresponding to the battery based, at least in part, on the voltage measurements. The method further includes estimating the state-of-charge of the battery based, at least in part, on the open-circuit voltage.
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Citations
25 Claims
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1. A method of determining a state-of-charge of a battery within a system powered at least in part by the battery comprising:
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collecting a plurality of voltage measurements during operation of the system; determining a time-constant of relaxation and an open-circuit voltage corresponding to the battery based, at least in part, on the voltage measurements and using a mathematical model of the battery that relates the voltage measurements to the open-circuit voltage and the time-constant of relaxation; and
,estimating the state-of-charge of the battery based, at least in part, on the open-circuit voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of operation within a system powered at least in part by a battery, the method comprising:
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collecting a plurality of voltage measurements over a first time interval and during operation of the system, wherein the plurality of voltage measurements are to be used to estimate a state-of-charge of the battery; adjusting a time-constant value based at least in part on the plurality of voltage measurements collected over the first time interval, the time-constant value indicating a rate at which the battery voltage transitions from a voltage under load to an open-circuit voltage; and adjusting the duration of the first time interval based at least in part on the time-constant value. - View Dependent Claims (14, 15)
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16. A system powered at least in part by a battery, the system comprising:
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voltage measurement circuitry coupled to the battery to generate a plurality of measurements of the battery voltage during operation of the system; battery management circuitry coupled to the voltage measurement circuitry to determine a time-constant of relaxation and an open-circuit voltage for the battery based, at least in part, on (i) the plurality of measurements of the battery voltage and (ii) a mathematical model of the battery that relates the battery voltage to the open-circuit voltage and the time-constant of relaxation; and estimating a state-of-charge of the battery based, at least in part, on the open-circuit voltage. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification