Crosstalk compensation in analysis of energy storage devices
First Claim
1. A method of estimating an impedance of an energy storage device, comprising:
- generating two or more input signals at different frequencies with a frequency step factor therebetween;
generating an excitation time record comprising a summation of the two or more input signals;
generating a deviation matrix of coefficients relative to parameters of the excitation time record to determine crosstalk between the two or more input signals;
stimulating an energy storage device with a signal generator applying the excitation time record and capturing a response time record indicative of a response of the energy storage device to the excitation time record with a response measurement device; and
applying the deviation matrix of coefficients to the response time record to remove the crosstalk and determine response signals including an in-phase component and a quadrature component of the impedance of the energy storage device at each of the different frequencies.
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Abstract
Estimating impedance of energy storage devices includes generating input signals at various frequencies with a frequency step factor therebetween. An excitation time record (ETR) is generated to include a summation of the input signals and a deviation matrix of coefficients is generated relative to the excitation time record to determine crosstalk between the input signals. An energy storage device is stimulated with the ETR and simultaneously a response time record (RTR) is captured that is indicative of a response of the energy storage device to the ETR. The deviation matrix is applied to the RTR to determine an in-phase component and a quadrature component of an impedance of the energy storage device at each of the different frequencies with the crosstalk between the input signals substantially removed. This approach enables rapid impedance spectra measurements that can be completed within one period of the lowest frequency or less.
40 Citations
34 Claims
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1. A method of estimating an impedance of an energy storage device, comprising:
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generating two or more input signals at different frequencies with a frequency step factor therebetween; generating an excitation time record comprising a summation of the two or more input signals; generating a deviation matrix of coefficients relative to parameters of the excitation time record to determine crosstalk between the two or more input signals; stimulating an energy storage device with a signal generator applying the excitation time record and capturing a response time record indicative of a response of the energy storage device to the excitation time record with a response measurement device; and applying the deviation matrix of coefficients to the response time record to remove the crosstalk and determine response signals including an in-phase component and a quadrature component of the impedance of the energy storage device at each of the different frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for characterizing an energy storage device, comprising:
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a signal generator configured for stimulating an energy storage device with a stimulus signal generated responsive to an excitation time record; a response measurement device configured for measuring a response signal when the stimulus signal is applied to the energy storage device, the response signal indicative of a response of the energy storage device to the stimulus signal; and an analyzer operably coupled to the stimulus signal and the response signal, the analyzer configured for; generating two or more input signals at different frequencies with a frequency step factor therebetween; generating the excitation time record comprising a summation of the two or more input signals; generating a deviation matrix of coefficients relative to parameters of the excitation time record to determine a crosstalk between the two or more input signals; sampling the response signal to generate a response time record; and applying the deviation matrix of coefficients to the response time record to remove the crosstalk and determine response signals including an in-phase component and a quadrature component of the impedance of the energy storage device at each of the different frequencies. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. Non-transitory computer-readable media including computer-executable instructions, which when executed on one or more computers, cause the computers to:
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generate two or more input signals at different frequencies with a frequency step factor therebetween; generate an excitation time record comprising a summation of the two or more input signals; generate a deviation matrix of coefficients relative to parameters of the excitation time record to determine a crosstalk between the two or more input signals; stimulate an energy storage device with the excitation time record and capture a response time record indicative of a response of the energy storage device to the excitation time record; and applying the deviation matrix of coefficients to the response time record to remove the crosstalk and determine response signals including an in-phase component of an impedance of the energy storage device and a quadrature component of the impedance of the energy storage device at each of the different frequencies. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34)
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Specification