In-situ battery diagnosis method using electrochemical impedance spectroscopy
First Claim
1. A method of estimating an internal state of at least a first electrochemical system for electrical power storage, wherein at least one property relative to the internal state of the first electrochemical system is estimated from electrochemical impedance measurements, comprising:
- carrying out testing in a laboratory of differing internal states of at least a second electrochemical system of a same type as the first electrochemical system by measuring the at least one property relative to the internal state of the second system and measuring the electrochemical impedance of the second electrochemical system at least at one frequency;
defining an electrochemical impedance model in a computer programmed with software, which when executed, provides the electrochemical impedance model as a function of the at least one property and of parameters, and calibrating the parameters by an adjustment of the electrochemical impedance measurements obtained for the internal states;
determining an electrochemical impedance Z of the at least the first electrochemical system for at least one frequency, andestimating the internal state of the at least the first electrochemical system by estimating the property relative to the internal state of the second electrochemical system using the model and the electrochemical impedance Z.
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Abstract
A method of estimating the internal state of a first electrochemical system for power storage is disclosed. The SoC and the electrochemical impedance are determined for different internal states of a second electrochemical system of a same type as the first electrochemical system being studied. An electrochemical impedance model is then defined as a function of the SoC and of parameters. The electrochemical impedance Z of the system studied is determined and its SoC is estimated using the model applied to electrochemical impedance Z.
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Citations
34 Claims
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1. A method of estimating an internal state of at least a first electrochemical system for electrical power storage, wherein at least one property relative to the internal state of the first electrochemical system is estimated from electrochemical impedance measurements, comprising:
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carrying out testing in a laboratory of differing internal states of at least a second electrochemical system of a same type as the first electrochemical system by measuring the at least one property relative to the internal state of the second system and measuring the electrochemical impedance of the second electrochemical system at least at one frequency; defining an electrochemical impedance model in a computer programmed with software, which when executed, provides the electrochemical impedance model as a function of the at least one property and of parameters, and calibrating the parameters by an adjustment of the electrochemical impedance measurements obtained for the internal states; determining an electrochemical impedance Z of the at least the first electrochemical system for at least one frequency, and estimating the internal state of the at least the first electrochemical system by estimating the property relative to the internal state of the second electrochemical system using the model and the electrochemical impedance Z. - 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)
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33. A system for estimating an internal state of a first electrochemical system for electrical power storage, comprising:
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at least one detector for measuring or estimating the electrochemical impedance of the first electrochemical system; a memory for storing software, which when executed by a computer, provides an electrochemical impedance model as a function of at least one property and parameters, the model being first calibrated by measurements in a laboratory of differing internal states of at least a second electrochemical system of a same type as the first electrochemical system; and means for calculating the property relative to the internal state of the electrochemical system using the model. - View Dependent Claims (34)
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Specification