Apparatus for estimating voltage of hybrid secondary battery and method thereof
First Claim
1. An apparatus for estimating voltage of a hybrid secondary battery, wherein the hybrid secondary battery comprises a first secondary battery and a second secondary battery having different electrochemical characteristics from each other and being connected in parallel with each other, the apparatus comprising:
- a sensor including a sense resistor configured to measure an operating current of the hybrid secondary battery; and
a battery management system including a processor and a memory, wherein the battery management system is electrically coupled to the hybrid secondary battery and wherein the battery management system is configured to estimate the voltage of the hybrid secondary battery using the operating current, and a voltage equation derived from a circuit model stored in the memory of the battery management system, the circuit model comprising a first circuit unit configured to simulate a voltage variation of the first secondary battery by a first open-circuit voltage element and optionally, a first impedance element, and a second circuit unit connected in parallel with the first circuit unit and configured to simulate a voltage variation of the second secondary battery by a second open-circuit voltage element and optionally, a second impedance element,wherein the battery management system is configured to initiate charging and discharging of the hybrid secondary battery based on the estimated voltage,wherein the voltage equation is described by the following expression;
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Abstract
An apparatus and a method for estimating voltage of a hybrid secondary battery are provided, in which the hybrid secondary battery includes a first secondary battery and a second secondary battery having different electrochemical characteristics from each other and being connected in parallel with each other. The apparatus includes a sensor unit which measures an operating current of the hybrid secondary battery, and a control unit which estimates the voltage of the hybrid secondary battery using the operating current, and a voltage equation derived from a circuit model including a first circuit unit which simulates a voltage variation of the first secondary battery by a first open-circuit voltage element and optionally, a first impedance element, and a second circuit unit which is connected in parallel with the first circuit unit and simulates a voltage variation of the second secondary battery by a second open-circuit voltage element and optionally, a second impedance element.
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Citations
17 Claims
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1. An apparatus for estimating voltage of a hybrid secondary battery, wherein the hybrid secondary battery comprises a first secondary battery and a second secondary battery having different electrochemical characteristics from each other and being connected in parallel with each other, the apparatus comprising:
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a sensor including a sense resistor configured to measure an operating current of the hybrid secondary battery; and a battery management system including a processor and a memory, wherein the battery management system is electrically coupled to the hybrid secondary battery and wherein the battery management system is configured to estimate the voltage of the hybrid secondary battery using the operating current, and a voltage equation derived from a circuit model stored in the memory of the battery management system, the circuit model comprising a first circuit unit configured to simulate a voltage variation of the first secondary battery by a first open-circuit voltage element and optionally, a first impedance element, and a second circuit unit connected in parallel with the first circuit unit and configured to simulate a voltage variation of the second secondary battery by a second open-circuit voltage element and optionally, a second impedance element, wherein the battery management system is configured to initiate charging and discharging of the hybrid secondary battery based on the estimated voltage, wherein the voltage equation is described by the following expression; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for estimating voltage of a hybrid secondary battery comprising a first secondary battery and a second secondary battery having different electrochemical characteristics from each other and being connected in parallel with each other, the method comprising:
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providing a battery management system electrically coupled to the hybrid secondary battery and including a processor and a memory, the memory including a circuit model comprising a first circuit unit configured to simulate a voltage variation of the first secondary battery by a first open-circuit voltage element and optionally, a first impedance element, and a second circuit unit connected in parallel with the first circuit unit and configured to simulate a voltage variation of the second secondary battery by a second open-circuit voltage element and optionally, a second impedance element; measuring an operating current of the hybrid secondary battery; determining, from the circuit model, a first current and a second current flowing through the first circuit unit and the second circuit unit, respectively; time-updating a first state of charge of the first secondary battery and a second state of charge of the second secondary battery, by adding up the determined first current and the determined second current, respectively; time-updating a first impedance voltage formed by the first impedance element and a second impedance voltage formed by the second impedance element, by using the time-updated first state of charge and the time-updated second state of charge, and the first current and the second current; determining a first open-circuit voltage of the first secondary battery and a second open-circuit voltage of the second secondary battery corresponding to the time-updated first state of charge and the time-updated second state of charge, respectively; and estimating the voltage of the hybrid secondary battery by substituting the determined first open-circuit voltage and the determined second open-circuit voltage, the time-updated first impedance voltage and the time-updated second impedance voltage, and the measured operating current, into a voltage equation derived from the circuit model; and initiating, via the battery management system, the charging and discharging of the hybrid secondary battery based on the estimated voltage, wherein the voltage equation is described by the following expression; - View Dependent Claims (14, 15, 16, 17)
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Specification