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Method and system for predicting electrochemical alternating-current impedance spectrum changing along with fuel cell attenuation

A technology of AC impedance spectroscopy and fuel cells, which is applied in prediction, design optimization/simulation, electrical digital data processing, etc. It can solve the problems of irreversible damage and consumption of fuel cells, and achieve the reduction of required time, high reliability and high precision Effect

Active Publication Date: 2021-09-03
上海艾福亿维测试设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Electrochemical AC impedance spectroscopy needs to consume additional energy to provide AC signal input during the test process, and long-term testing will cause certain irreversible damage to the fuel cell

Method used

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  • Method and system for predicting electrochemical alternating-current impedance spectrum changing along with fuel cell attenuation
  • Method and system for predicting electrochemical alternating-current impedance spectrum changing along with fuel cell attenuation
  • Method and system for predicting electrochemical alternating-current impedance spectrum changing along with fuel cell attenuation

Examples

Experimental program
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Effect test

Embodiment 1

[0067] In the fuel cell attenuation experiment, take 50h as the time period T, record the high-frequency internal resistance data r ohm Variation with decay time t.

[0068] Take a quadratic polynomial: r=a 2 x 2 +a 1 x+a 0 , where r is the high-frequency internal resistance of the fuel cell, x is the decay test time, and a is the coefficient.

[0069] Considering the measurement noise of the instrument, the above-mentioned quadratic polynomial is corrected as r=a 2 x 2 +a 1 x+a 0 +ε, where ε is the noise mean square error.

[0070] Take the 0-300h high-frequency internal resistance measured data, and calculate r=a 2 x 2 +a 1 x+a 0 The actual function of +ε.

[0071] According to the calculation, the parameter a T estimated value of Estimated High Frequency Internal Resistance Vary with test time t;

[0072] During the attenuation test, as mentioned above, the high-frequency internal resistance in the subsequent attenuation experiment is estimated based on t...

Embodiment 2

[0075] In the fuel cell attenuation experiment, take 50h as the time period T, record the high-frequency impedance arc radius R hf Variation with decay time t.

[0076] Take a quadratic polynomial: r=a 2 x 2 +a 1 x+a 0 , where r is the high frequency impedance arc radius R hf , x is the time of the decay test, and a is the coefficient.

[0077] Considering the measurement noise of the instrument, the above-mentioned quadratic polynomial is corrected as r=a 2 x 2 +a 1 x+a 0 +ε, where ε is the noise mean square error.

[0078] Take 0-300h high frequency impedance arc radius R hf Measured data, calculated to get r=a 2 x 2 +a 1 x+a 0 The actual function of +ε.

[0079] According to the calculation, the parameter a T estimated value of Estimated high-frequency impedance arc radius R hf Vary with test time t;

[0080] During the attenuation test, as mentioned above, the radius R of the high-frequency impedance arc in the subsequent attenuation experiment is estim...

Embodiment 3

[0083] In the fuel cell attenuation experiment, take 50h as the time period T, record the low-frequency impedance arc radius R lf Variation with decay time t.

[0084] Take a quadratic polynomial: r=a 2 x 2 +a 1 x+a 0 , where r is the low-frequency impedance arc radius R lf , x is the time of the decay test, and a is the coefficient.

[0085] Considering the measurement noise of the instrument, the above-mentioned quadratic polynomial is corrected as r=a 2 x 2 +a 1 x+a 0 +ε, where ε is the noise mean square error.

[0086] Take 0-300h low frequency impedance arc radius R lf Measured data, calculated to get r=a 2 x 2 +a 1 x+a 0 The actual function of +ε.

[0087] According to the calculation, the parameter a T estimated value of Estimated low frequency impedance arc radius R lf Vary with test time t;

[0088] During the attenuation test, as mentioned above, the radius R of the low-frequency impedance arc in the subsequent attenuation experiment is estimated ...

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Abstract

The invention relates to a method and a system for predicting an electrochemical alternating-current impedance spectrum changing along with fuel cell attenuation, and the method comprises the following steps: a data recording step: in a fuel cell attenuation experiment, recording the numerical value change of data to be measured by taking T as a time period; an equation establishment step: establishing an equation of to-be-tested data and attenuation test time; a parameter calculation and verification step: calculating parameters of a verification equation based on the established equation; a to-be-tested data estimation step: estimating the change of the to-be-tested data along with the test time according to the calculated estimated values of the parameters; and a fuel cell electrochemical alternating-current impedance spectrum estimation step: estimating the fuel cell electrochemical alternating-current impedance spectrum based on the estimated to-be-measured data. According to the method, the change of the alternating current impedance spectrum is estimated based on the Bayesian principle and an equivalent circuit model through high-frequency and low-frequency test results accumulated in the attenuation process of the fuel cell. Compared with the prior art, the method is high in precision and high in reliability of calculation results, and meanwhile, the time required for fuel cell life testing can be shortened.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a method and system for predicting electrochemical AC impedance spectra that vary with fuel cell attenuation. Background technique [0002] The fuel cell is like a black box during operation. As an effective electrochemical test method, electrochemical impedance spectroscopy can provide multi-dimensional data for the fuel cell's operating state, which is used to evaluate the current operating state of the fuel cell and predict the remaining life. [0003] Electrochemical AC impedance spectroscopy needs to consume extra energy to provide AC signal input during the test process, and long-term testing will cause certain irreversible damage to the fuel cell. An effective electrochemical impedance spectroscopy model is crucial for electrochemical impedance spectroscopy testing of fuel cells, which can effectively reduce test time, reduce damage to fuel cells, and improve fuel cell life. Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06Q10/04G06F119/02
CPCG06F30/20G06Q10/04G06F2119/02Y02E60/50
Inventor 杨跃邓延斌祖文强徐祥吴超章文辉
Owner 上海艾福亿维测试设备有限公司
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