Method and apparatus for determining Characteristic parameters of a charge storage device
First Claim
1. A method of determining characteristic parameters of a charge storage device, based on a wide frequency range of impedance measurements and a non-linear equivalent circuit model, which is used to obtain the parameters of the charge storage device such as a primary battery, secondary battery, capacitor, supercapicitor and fuel cell, the method comprising the steps of:
- (1) measuring voltage and current characteristics in a process of charging/discharging of charge storage device by applying a voltage/current at a predetermined discharge rate;
(2) measuring impedance spectra at a predetermined range of frequency by measuring the current and voltage from both terminals of the charge storage device or from an electrical load directly connected to the charge storage device at a plurality of states of charge within the entire charge/discharge interval; and
(3) obtaining the parameters of the non-linear equivalent circuit of the charge storage device from the charge or discharge characteristics measured in step (1) and the characteristic impedance spectrum in the predetermined range of frequency measured in step (2).
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Abstract
A method and an apparatus for determining characteristic parameters of a charge storage device based on a wide frequency range of impedance measurement and a non-linear equivalent circuit model by which the parameters of the non-linear equivalent circuit model indicative of the characteristics of various charge storage devices such as a primary battery, secondary battery, capacitor, supercapacitor and fuel cell are determined, the method comprising the steps of: (1) measuring voltage and current characteristics in a process of charging/discharging of the charge storage device by applying a voltage/current at a predetermined discharge rate; (2) measuring impedance spectra at a predetermined range of frequency by measuring the current and voltage from both terminals of the charge storage device or from an electrical load directly connected to the charge storage device at a plurality of states of charge within the entire charge/discharge interval; and (3) obtaining the parameters of the non-linear equivalent circuit of the charge storage device from the charge or discharge characteristics measured in step (1) and the characteristic impedance spectrum in the predetermined range of frequency measured in step (2).
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Citations
38 Claims
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1. A method of determining characteristic parameters of a charge storage device, based on a wide frequency range of impedance measurements and a non-linear equivalent circuit model, which is used to obtain the parameters of the charge storage device such as a primary battery, secondary battery, capacitor, supercapicitor and fuel cell, the method comprising the steps of:
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(1) measuring voltage and current characteristics in a process of charging/discharging of charge storage device by applying a voltage/current at a predetermined discharge rate; (2) measuring impedance spectra at a predetermined range of frequency by measuring the current and voltage from both terminals of the charge storage device or from an electrical load directly connected to the charge storage device at a plurality of states of charge within the entire charge/discharge interval; and (3) obtaining the parameters of the non-linear equivalent circuit of the charge storage device from the charge or discharge characteristics measured in step (1) and the characteristic impedance spectrum in the predetermined range of frequency measured in step (2). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 37)
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15. A method of determining characteristic parameters of a charge storage device, based on a wide frequency range of impedance measurements and a non-linear equivalent circuit model, which is used to obtain the parameters of the charge storage device such as a primary battery, secondary battery, capacitor, supercapacitor and fuel cell in a certain state of charge, the method comprising the steps of:
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(1) measuring a impedance spectrum in a predetermined range of frequency from voltage and current applied to both terminals of the charge storage device in the corresponding state of charge; and (2) determining parameters of the non-linear equivalent circuit of the charge storage device in the corresponding state of charge from the measured impedance spectrum in the predetermined range of frequency. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 38)
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28. An apparatus for determining parameters of a charge storage device by a wide frequency range of impedance measurements and a non-linear equivalent circuit model comprising:
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a control means for determining parameters of the charge storage device and simulating various operational characteristics of a circuit including a charge storage device using the determined parameters; a digital-to-analog converter for converting a predetermined voltage and current data output from the control means to an analog signal; a potentiostat and/or galvanostat for applying the output signal of the digital-to-analog converter to the charge storage device to output the voltage and current of the capacitor; an analog-to-digital converter for converting a voltage based on the voltage and current of the charge storage device output from the potentiostat and/or galvanostat and feeding them into the control means; and a circuit simulator for simulating various operational characteristics of a charge storage device based on the parameters obtained from the control means for a predetermined equivalent circuit including the charge storage device. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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Specification