Method and Circuitry to Calculate the State of Charge of a Battery/Cell
First Claim
1. A method to determine a state of charge of a battery, wherein the battery includes at least two terminals, the method comprising:
- determining a first indicator of a state of health of the battery during a first charge cycle;
correlating the first indicator of the state of health of the battery to a first relationship of an open circuit voltage to an amount of charge in the battery;
measuring a voltage at the terminals of the battery;
calculating an open circuit voltage of the battery using the voltage measured at the terminals of the battery, a current applied to or removed from the battery and an impedance of the battery; and
determining a first state of charge of the battery using (i) the calculated open circuit voltage and (ii) the first relationship of the open circuit voltage to the amount of charge in the battery.
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Accused Products
Abstract
The present inventions, in one aspect, are directed to techniques and/or circuitry to applying a current pulse to the terminals of the battery during a charge, measuring a voltage at the terminals of the battery, determining a relationship of an open circuit voltage to an amount of charge in the battery using data which is representative of a state of health of the battery, calculating an open circuit voltage of the battery using the voltage measured at the terminals of the battery, a current applied to or removed from the battery and an impedance of the battery, and determining a state of charge of the battery using (i) the calculated open circuit voltage and (ii) the relationship of the open circuit voltage to the amount of charge.
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Citations
23 Claims
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1. A method to determine a state of charge of a battery, wherein the battery includes at least two terminals, the method comprising:
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determining a first indicator of a state of health of the battery during a first charge cycle; correlating the first indicator of the state of health of the battery to a first relationship of an open circuit voltage to an amount of charge in the battery; measuring a voltage at the terminals of the battery; calculating an open circuit voltage of the battery using the voltage measured at the terminals of the battery, a current applied to or removed from the battery and an impedance of the battery; and determining a first state of charge of the battery using (i) the calculated open circuit voltage and (ii) the first relationship of the open circuit voltage to the amount of charge in the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus to determine a state of charge of a battery, wherein the battery includes at least two terminals, the apparatus comprising:
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signal generation circuitry, coupled to the battery, to generate a signal and apply the signal to the terminals of the battery, wherein the signal includes at least one pulse; measurement circuitry, coupled to the battery, to measure a terminal voltage of the battery in response to the pulse; and control circuitry, coupled to the measurement circuitry, wherein the control circuitry is configured to; determine data which is indicative of a state of health of the battery using the terminal voltage of the battery in response to the pulse; determine a relationship of an open circuit voltage to an amount of charge in the battery using the data which is indicative of a state of health of the battery; calculate an open circuit voltage of the battery using the voltage measured at the terminals of the battery, a current applied to or removed from the battery and an impedance of the battery; and determine a state of charge of the battery using (i) the calculated open circuit voltage and (ii) the relationship of the open circuit voltage to the amount of charge in the battery. - View Dependent Claims (12, 13, 14, 15)
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16. A method to calculate and output a state of charge of a battery, wherein the battery includes at least two terminals, the method comprising:
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applying a current pulse to the terminals of the battery during a charge cycle; measuring a voltage at the terminals of the battery in response to the current pulse; determining data which is indicative of a state of health of the battery using the voltage at the terminals of the battery; determining a relationship of an open circuit voltage to an amount of charge in the battery using the data which is representative of the state of health of the battery; calculating an open circuit voltage of the battery using the voltage measured at the terminals of the battery, a current applied to or removed from the battery and an impedance of the battery; and determining a state of charge of the battery using (i) the calculated open circuit voltage and (ii) the relationship of the open circuit voltage to the amount of charge in the battery. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification