System and method for a rechargeable battery
First Claim
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1. A method for a rechargeable battery comprising:
- applying a charge voltage to the rechargeable battery;
monitoring a battery voltage and a battery current of the rechargeable battery; and
identifying a top of charge condition when for a defined time period the battery voltage is within a voltage tolerance of the charge voltage and the battery current is within a current tolerance of a threshold current;
establishing a state of charge corresponding to a known available energy capacity of the rechargeable battery when the top of charge condition is identified, the known available energy capacity being determined based at least in part on the charge voltage and a float voltage of the rechargeable battery.
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Abstract
A method for a rechargeable battery is disclosed that includes applying a charge voltage to the rechargeable battery; monitoring a battery voltage and a battery current of the rechargeable battery; and identifying a top of charge condition when for a defined time period the battery voltage is within a voltage tolerance of the charge voltage and the battery current is within a current tolerance of a threshold current. Also disclosed is a rechargeable battery system.
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Citations
25 Claims
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1. A method for a rechargeable battery comprising:
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applying a charge voltage to the rechargeable battery; monitoring a battery voltage and a battery current of the rechargeable battery; and identifying a top of charge condition when for a defined time period the battery voltage is within a voltage tolerance of the charge voltage and the battery current is within a current tolerance of a threshold current; establishing a state of charge corresponding to a known available energy capacity of the rechargeable battery when the top of charge condition is identified, the known available energy capacity being determined based at least in part on the charge voltage and a float voltage of the rechargeable battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for a rechargeable battery comprising:
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applying a charge voltage to the rechargeable battery at a voltage that is greater than a float voltage of the rechargeable battery; monitoring a battery voltage and a battery current of the rechargeable battery; reducing the charge voltage to the float voltage; calculating a battery resistance from the battery voltage and the battery current; and identifying a top of charge condition when for a defined time period the battery voltage is within a tolerance of the float voltage and the calculated battery resistance is greater than a threshold resistance. - View Dependent Claims (12, 13)
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14. A method for a rechargeable battery comprising:
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monitoring a battery voltage and battery current of the rechargeable battery; applying a charge voltage to the rechargeable battery at a voltage level that is greater than a float voltage of the rechargeable battery; reducing the charge voltage to the float voltage; and identifying a top of charge condition when for a defined time period the battery voltage is within a voltage tolerance of the float voltage and the battery current is within a tolerance of zero amps. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A rechargeable battery system comprising:
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means for applying a charge voltage to the rechargeable battery; means for monitoring a battery voltage and a battery current of the rechargeable battery; and means for identifying a top of charge condition when for a defined time period the battery voltage is within a voltage tolerance of the charge voltage and the battery current is within a current tolerance of a threshold current; wherein the rechargeable battery comprises a plurality of sodium-metal-halide cells.
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25. A rechargeable battery system comprising:
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a rechargeable battery; a source configured to apply a charge voltage to the rechargeable battery, the charge voltage being greater than a float voltage of the rechargeable battery; a voltage sensor configured to monitor a battery voltage of the rechargeable battery; a current sensor configured to monitor a battery current of the rechargeable battery; and a controller in communication with the voltage sensor and the current sensor, the controller configured to reduce the charge voltage to a float voltage and to identify a top of charge condition of the rechargeable battery when for a defined time period the battery voltage is within a voltage tolerance of the float voltage and the battery current is within a current tolerance of a threshold current.
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Specification