Step-time battery degradation determination
First Claim
1. A method of determining a remaining battery capacity of a battery comprising;
- operating a battery as an energy source in an electric power distribution grid through a series of states of charge including idle, charging and discharging states;
switching from a first state of charge from one of an idle, charging or discharging state to a different one of the idle, charging or discharging states, after a duration of time;
responsive to the switching, calculating an amount of remaining battery capacity based upon a complete history of accrued battery degradation for the battery including battery degradation accrued during the first state of charge and a type of the first state of charge of the battery;
repeating the operating, switching and calculating for each state in the series of states of charge until the calculated remaining battery capacity is determined to have reached an end-of-life threshold; and
responsive to determining that the calculated remaining battery capacity has reached an end-of-life threshold, replacing the battery with a new battery.
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Accused Products
Abstract
Various embodiments determine a remaining battery capacity of a battery in an energy storage battery support system. In one embodiment, a battery is operated at a state of charge which may include being charged, being discharged, and being idle. A change in the state of charge is detected after a duration of time. The amount of remaining battery capacity is calculated based upon the duration of time and the state of charge of the battery during the duration of time. The operating, detecting and calculating are repeated until the amount of remaining battery capacity reaches a predetermined value. The remaining battery capacity after the duration of time is calculated using the battery capacity at the beginning of the duration of time. The battery may be used as an energy source in an electric power distribution grid. The battery is replaced when the remaining battery capacity reaches an end-of-useful-life value.
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Citations
20 Claims
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1. A method of determining a remaining battery capacity of a battery comprising;
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operating a battery as an energy source in an electric power distribution grid through a series of states of charge including idle, charging and discharging states; switching from a first state of charge from one of an idle, charging or discharging state to a different one of the idle, charging or discharging states, after a duration of time; responsive to the switching, calculating an amount of remaining battery capacity based upon a complete history of accrued battery degradation for the battery including battery degradation accrued during the first state of charge and a type of the first state of charge of the battery; repeating the operating, switching and calculating for each state in the series of states of charge until the calculated remaining battery capacity is determined to have reached an end-of-life threshold; and responsive to determining that the calculated remaining battery capacity has reached an end-of-life threshold, replacing the battery with a new battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An energy storage battery support system for use in an electric power distribution grid, the energy storage battery support system comprising:
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a rechargeable battery; a load; an inverter that exchanges energy between the rechargeable battery and the load; and a controller that; operates the battery through a series of states of charge including idle, charging and discharging states; and switches operation from a first state of charge from one of an idle, charging or discharging state to a different one of the idle, charging or discharging states, after a duration of time a state of charge monitor that; monitors the operation of the battery; detects the switch in the state of charge after a duration of time; and responsive to the switching, calculates an amount of remaining battery capacity based upon a complete history of accrued battery degradation for the battery including battery degradation accrued during the first state of charge and a type of the first state of charge of the battery; and wherein the controller further controls; repeating the operating, switching and calculating for each state in the series of states of charge until the calculated remaining battery capacity is determined to have reached an end-of-life threshold; and responsive to determining that the calculated remaining battery capacity has reached an end-of-life threshold, replacing the battery with a new battery. - View Dependent Claims (12, 13, 14, 15)
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16. A computer program product for determining a remaining battery capacity of a battery, the computer program product comprising:
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a non-transitory storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising; operating a battery as an energy source in an electric power distribution grid through a series of states of charge including idle, charging and discharging states; switching from a first state of charge from one of an idle, charging or discharging state to a different one of the idle, charging or discharging states, after a duration of time; responsive to the switching, calculating an amount of remaining battery capacity based upon a complete history of accrued battery degradation for the battery including battery degradation accrued during the first state of charge and a type of the first state of charge of the battery; repeating the operating, switching and calculating for each state in the series of states of charge until the calculated remaining battery capacity is determined to have reached an end-of-life threshold; and responsive to determining that the calculated remaining battery capacity has reached an end-of-life threshold, replacing the battery with a new battery. - View Dependent Claims (17, 18, 19, 20)
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Specification