Method of determining state of charge of energy storage system
First Claim
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1. A method of determining state-of-charge (SOC) of a battery, the method comprising:
- performing SOC calibration by changing the SOC of the battery over a portion of a full SOC range to assure operation defined by open circuit voltage (Voc) of the battery following a known Voc-SOC profile;
determining a Voc value; and
estimating SOC of the battery based upon the Voc value and the known Voc-SOC profile.
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Abstract
A method of determining state-of-charge (SOC) of a battery includes changing the SOC of the battery over a portion of a full SOC range to assure operation defined by open circuit voltage (Voc) of the battery following a known Voc-SOC profile; determining a Voc value; and estimating SOC of the battery based upon the Voc value and the known Voc-SOC profile.
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Citations
21 Claims
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1. A method of determining state-of-charge (SOC) of a battery, the method comprising:
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performing SOC calibration by changing the SOC of the battery over a portion of a full SOC range to assure operation defined by open circuit voltage (Voc) of the battery following a known Voc-SOC profile; determining a Voc value; and estimating SOC of the battery based upon the Voc value and the known Voc-SOC profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 12)
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10. A method of determining state-of-charge (SOC) of a battery, the method comprising:
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changing the SOC of the battery over a portion of a full SOC range to assure operation defined by open circuit voltage (Voc) of the battery following a known Voc-SOC profile; determining a Voc value; estimating SOC of the battery based upon the Voc value and the known Voc-SOC profile; wherein changing SOC comprises operating the battery with a series of micro-cycles comprising both charging and discharging; wherein the series of micro-cycles are produced by operation of a regenerative drive of an elevator system; and synchronizing the changing of SOC with a traffic profile of the elevator system. - View Dependent Claims (11)
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13. A method for determining state-of-charge (SOC) of an energy storage system of a regenerative drive elevator system, the method comprising:
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performing SOC calibration by partially charging or discharging the energy storage system to assure operation defined by open circuit voltage (Voc) of the energy storage system following a known Voc-SOC profile; measuring Voc; and estimating SOC as a function of the measured Voc based upon the known Voc-SOC profile. - View Dependent Claims (14, 15, 16, 17)
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18. An elevator system comprising:
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a regenerative drive; a hoist motor operated by the regenerative drive; an electrical energy storage (EES) system connected to the regenerative drive; and an EES system controller for controlling charging and discharging of the EES system as function of state-of-charge (SOC), and for performing SOC calibration by charging or discharging the EES system to a known open circuit voltage Voc-SOC boundary curve, measuring Voc of the EES system, and estimating SOC as a function of Voc and the Voc-SOC boundary curve. - View Dependent Claims (19, 20)
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21. An elevator system comprising:
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a regenerative drive; a hoist motor operated by the regenerative drive; an electrical energy storage (EES) system connected to the regenerative drive; and an EES system controller for controlling charging and discharging of the EES system as function of state-of-charge (SOC), and for performing SOC calibration by charging or discharging the EES system to a known open circuit voltage Voc-SOC boundary curve, measuring Voc of the EES system, and estimating SOC as a function of Voc and the Voc-SOC boundary curve; wherein the EES system controller charges or discharges the EES system during SOC calibration to produce a change of SOC of up to about 80% of a full SOC range; wherein the EES system controller charges or discharges the EES system during SOC calibration with a series of micro-cycles produced by operation of the regenerative drive; and wherein the EES system controller synchronizes the SOC calibration with a traffic profile of the elevator system.
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Specification