Multiple model systems and methods for testing electrochemical systems
First Claim
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1. A method for testing an electrochemical system, the method comprising:
- obtaining complex impedance data for the electrochemical system at a plurality of frequencies;
fitting the complex impedance data to a plurality of models of the electrochemical system to obtain a set of fitted parameters, the set of fitted parameters comprising at least one fitted parameter corresponding to each of the models; and
, deriving a value for a characteristic of the electrochemical system based upon one or more parameters selected from the set of one or more fitted parameters.
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Abstract
A method for testing an electrochemical system includes obtaining complex impedance data for the electrochemical system at multiple frequencies; fitting the complex impedance data to two or more models of the system to obtain a set of fitted parameters; and deriving a value for a characteristic of the electrochemical system based upon parameters of the set of fitted parameters. The electrochemical system may be an electrochemical battery. The characteristic may be a state of health, state of charge, or other characteristic of a battery.
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Citations
45 Claims
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1. A method for testing an electrochemical system, the method comprising:
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obtaining complex impedance data for the electrochemical system at a plurality of frequencies;
fitting the complex impedance data to a plurality of models of the electrochemical system to obtain a set of fitted parameters, the set of fitted parameters comprising at least one fitted parameter corresponding to each of the models; and
,deriving a value for a characteristic of the electrochemical system based upon one or more parameters selected from the set of one or more fitted parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A method for deriving a characteristic of an electrochemical system comprising:
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extracting impedance data from the electrochemical system at a plurality of discrete frequencies;
mathematically fitting a plurality of models to the extracted impedance data to obtain a set of fitted parameters;
inferring the characteristic based on one or more parameters selected from the set of fitted parameters. - View Dependent Claims (40, 43)
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39. Apparatus for testing an electrochemical system, the apparatus comprising:
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a measuring circuit connectable to measure responses of the electrochemical system to an excitation signal at a plurality of frequencies;
a data processor configured to;
obtain complex impedance data for the electrochemical system from the measuring circuit;
fit the complex impedance data to a plurality of models of the electrochemical system to obtain a set of fitted parameters, the set of fitted parameters comprising at least one fitted parameter corresponding to each of the models; and
,derive a value for a characteristic of the electrochemical system based upon one or more parameters of the set of fitted parameters. - View Dependent Claims (41, 42)
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44. An apparatus for testing an electrochemical system comprising:
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means for extracting impedance data from the electrochemical system at a plurality of discrete frequencies;
means for mathematically fitting a plurality of models to the extracted impedance data to obtain a set of fitted parameters;
means for inferring a characteristic of the electrochemical system based on one or more parameters selected from the set of fitted parameters.
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45. A machine readable medium carrying data, which data comprises a set of instructions which, when executed by a data processor, cause the data processor to perform a method of testing an electrochemical system, the method comprising:
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obtaining impedance data for the electrochemical system at a plurality of frequencies;
fitting the impedance data to a plurality of models of the electrochemical system to obtain a set of fitted parameters, the set of fitted parameters comprising at least one fitted parameter corresponding to each of the models; and
,deriving a value for a characteristic of the electrochemical system based upon one or more parameters selected from the set fitted parameters.
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Specification