Method and circuitry to calculate the state of charge of a battery/cell
First Claim
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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:
- applying a signal to the terminals of the battery, wherein the signal includes at least one pulse;
measuring a terminal voltage of the battery which is a voltage between the terminals of the battery, wherein measuring the terminal voltage of the battery includes measuring a first terminal voltage of the battery which is in response to a first pulse of the signal and at a first predetermined time relative to applying the first pulse of the signal to the terminals of the battery;
monitoring the terminal voltage of the battery after applying the first pulse of the signal to the terminals of the battery and before applying a second pulse of the signal to the terminals of the battery to determine a second terminal voltage, wherein the second terminal voltage of the battery is a voltage which correlates to an equilibrium voltage of the battery;
calculating data which is representative of an overpotential of the battery using the first terminal voltage of the battery and the second terminal voltage of the battery;
determining data which is representative of a state of charge of the battery using the data which is representative of the overpotential of the battery; and
outputting the data which is representative of the state of charge of the battery.
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Abstract
The present inventions, in one aspect, are directed to techniques and/or circuitry to determine the state of charge of a battery/cell using data which is representative of an overpotential of the battery/cell. In yet another aspect the present inventions are directed to techniques and/or circuitry to adaptively charge a battery/cell using data which is representative of a state of charge of the battery/cell and/or the data which is representative of an overpotential of the battery/cell.
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Citations
24 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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applying a signal to the terminals of the battery, wherein the signal includes at least one pulse; measuring a terminal voltage of the battery which is a voltage between the terminals of the battery, wherein measuring the terminal voltage of the battery includes measuring a first terminal voltage of the battery which is in response to a first pulse of the signal and at a first predetermined time relative to applying the first pulse of the signal to the terminals of the battery; monitoring the terminal voltage of the battery after applying the first pulse of the signal to the terminals of the battery and before applying a second pulse of the signal to the terminals of the battery to determine a second terminal voltage, wherein the second terminal voltage of the battery is a voltage which correlates to an equilibrium voltage of the battery; calculating data which is representative of an overpotential of the battery using the first terminal voltage of the battery and the second terminal voltage of the battery; determining data which is representative of a state of charge of the battery using the data which is representative of the overpotential of the battery; and outputting the data which is representative of the state of charge of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification