Method and circuitry to adjust, correct and/or compensate an SOC of a battery based on relaxation time thereof
First Claim
1. A method to adaptively charge a battery, wherein the battery includes at least two terminals, the method comprising:
- measuring a first voltage at the terminals of the battery after terminating a current applied to the terminals of the battery;
determining data which is representative of a relaxation time of the battery using the first voltage and a form, shape or rate of decay of the voltage of the battery after terminating application of the current, wherein the relaxation time is an amount of time corresponding to when the voltage at the terminals of the battery decays to a voltage which correlates to an equilibrium voltage of the battery;
determining data corresponding to a state of charge of the battery using the data which is representative of the relaxation time; and
charging the battery using a charge process having a characteristic based on the data corresponding to the battery'"'"'s state of charge.
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Accused Products
Abstract
The present inventions, in one aspect, are directed to techniques and/or circuitry to adjust, correct and/or compensate a state of charge of the battery using the data which is representative of the relaxation time (e.g., full relaxation time) of the battery. The techniques and/or circuitry may determine the data which is representative of a relaxation time based on or using: (i) the rate of decay of the voltage at the terminals of the battery after terminating application of the charge current to the battery, (ii) a voltage which is constant or substantially constant after termination of the charge current and/or (iii) an amount of time associated with the decay of the voltage at the terminals of the battery to at least a measured or predetermined voltage. Notably, the charge signal or current may include a plurality of pulses.
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Citations
23 Claims
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1. A method to adaptively charge a battery, wherein the battery includes at least two terminals, the method comprising:
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measuring a first voltage at the terminals of the battery after terminating a current applied to the terminals of the battery; determining data which is representative of a relaxation time of the battery using the first voltage and a form, shape or rate of decay of the voltage of the battery after terminating application of the current, wherein the relaxation time is an amount of time corresponding to when the voltage at the terminals of the battery decays to a voltage which correlates to an equilibrium voltage of the battery; determining data corresponding to a state of charge of the battery using the data which is representative of the relaxation time; and charging the battery using a charge process having a characteristic based on the data corresponding to the battery'"'"'s state of charge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 21, 22)
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10. A method to adaptively charge a battery, wherein the battery includes at least two terminals, the method comprising:
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applying a charge current to the terminals of the battery; terminating the charge current; measuring a first voltage at the terminals of the battery after terminating the charge current; determining data which is representative of a relaxation time of the battery using the first voltage and a form, shape or rate of decay of the voltage of the battery after terminating the charge current, wherein the relaxation time is an amount of time corresponding to when, in response to terminating the charge current, the voltage at the terminals of the battery decays to an equilibrium voltage of the battery; adjusting, correcting or compensating a state of charge of the battery using the data which is representative of the relaxation time; and applying a charge to the terminals of the battery using a charge process that is dependent on the adjusted, corrected, or compensated state of charge of the battery. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An apparatus to determine a state of charge of a battery and adaptively charge the battery, wherein the battery includes at least two terminals, the apparatus comprising:
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charging circuitry, coupled to the battery, to (i) generate and apply the charge current to the battery, (ii) terminate application of the charge current to the battery, and (iii) charge the battery using a charge process that is dependent on a state of charge of the battery; measurement circuitry, coupled to the battery, to measure a first voltage at the terminals of the battery after terminating application of the charge current to the battery; control circuitry, coupled to the measurement circuitry, wherein the control circuitry is configured to; determine data which is representative of a relaxation time of the battery using at least the first voltage, wherein the relaxation time is an amount of time corresponding to when, after terminating the charge current, the voltage at the terminals of the battery decays to at least the first voltage; and adjust, correct, or compensate the state of charge of the battery using the data which is representative of the relaxation time. - View Dependent Claims (17, 18, 19, 20)
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23. A method of adaptively charging a battery, wherein the battery includes at least two terminals, the method comprising:
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measuring a first voltage at the terminals of the battery after terminating a current applied to the terminals of the battery; determining data which is representative of a relaxation time of the battery using the first voltage and a form, shape or rate of decay of the voltage of the battery after terminating application of the current, wherein the relaxation time is an amount of time corresponding to when the voltage at the terminals of the battery decays to a voltage which correlates to an equilibrium voltage of the battery; determining data corresponding to the battery'"'"'s state of health using the data which is representative of the relaxation time; and charging the battery using a charge process having a characteristic based on the data corresponding to the battery'"'"'s state of health.
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Specification