An electrochemical impedance spectroscopy detection verification method, device, equipment and storage medium

Abstract

The application discloses a kind of electrochemical impedance spectroscopy detection verification method, device, equipment and storage medium.Therein, the detection verification method includes: obtaining standard frequency band sequence;According to standard frequency band sequence, the disturbance current of sampling frequency point is input to detection verification circuit;Obtain the measured impedance real part and measured impedance imaginary part corresponding to sampling frequency point;According to measured impedance real part and theoretical impedance real part, determine calibration real part coefficient, according to measured impedance imaginary part and theoretical impedance imaginary part, determine calibration imaginary part coefficient;Calibration real part coefficient and calibration imaginary part coefficient are input into electrochemical impedance spectroscopy module.The technical scheme of the present application realizes the verification of electrochemical impedance spectroscopy module, and then makes the electrochemical impedance spectroscopy modules in different direct current converters have a unified calibration method, to ensure the accuracy and reliability of electrochemical impedance spectroscopy module test.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and in particular to a method, apparatus, equipment, and storage medium for detecting and verifying electrochemical impedance spectroscopy. Background Technology

[0002] As a core power conversion component of a fuel cell system, the direct current / direct current converter (DC / DC converter) has an integrated electrochemical impedance spectroscopy (EIS) module responsible for generating disturbance currents and acquiring impedance data. In existing technologies, the EIS impedance values ​​measured by the integrated EIS modules of DC / DC converters from different suppliers for the same fuel cell stack show significant deviations, and there is no unified calibration method. Summary of the Invention

[0003] This invention provides a method, apparatus, device, and storage medium for detecting and verifying electrochemical impedance spectroscopy, so as to realize the verification of the electrochemical impedance spectroscopy module in a DC-DC converter.

[0004] According to a first aspect of the present invention, a method for detecting and verifying electrochemical impedance spectroscopy is provided, applied in a detection and verification circuit; the detection and verification circuit includes: a host computer, an electronic source, a load, a DC-DC converter, and a verification fixture; the electronic source is electrically connected to a first terminal of the DC-DC converter, and the verification fixture is connected in series between the positive terminal of the electronic source and the first terminal; the second terminal of the DC-DC converter is electrically connected to the positive terminal of the load; the negative terminal of the load is electrically connected to a third terminal of the DC-DC converter; the negative terminal of the electronic source is electrically connected to a fourth terminal of the DC-DC converter; the DC-DC converter includes an electrochemical impedance spectroscopy module; the host computer is communicatively connected to the DC-DC converter; The detection and verification methods include: Obtain the standard frequency band sequence; wherein the standard frequency band sequence includes n sampling frequency points; n is a positive integer and n≥1; According to the standard frequency band sequence, the perturbation current of the sampling frequency point is input to the detection and verification circuit; Obtain the real part and imaginary part of the measured impedance corresponding to the sampling frequency point; The calibration real part coefficient is determined based on the measured real part and the theoretical real part of the impedance, and the calibration imaginary part coefficient is determined based on the measured imaginary part and the theoretical imaginary part of the impedance. Input the real and imaginary coefficients of the calibration into the electrochemical impedance spectroscopy module.

[0005] Optionally, after inputting the real and imaginary calibration coefficients into the electrochemical impedance spectroscopy module, the following additional steps are also included: Obtain the real part and imaginary part of the calibrated measured impedance corresponding to the sampling frequency point; wherein, the real part of the calibrated measured impedance is the real part value of the impedance generated based on the calibration real part coefficient and the real part of the measured impedance; the imaginary part of the calibrated measured impedance is the imaginary part value of the impedance generated based on the calibration imaginary part coefficient and the imaginary part of the measured impedance. The calibration real part coefficient is determined based on the real part of the calibrated measured impedance and the real part of the theoretical impedance, and the calibration imaginary part coefficient is determined based on the imaginary part of the calibrated measured impedance and the imaginary part of the theoretical impedance. Input the real and imaginary coefficients of the calibration into the electrochemical impedance spectroscopy module.

[0006] Optionally, the calibration real part coefficient is determined based on the real part of the measured impedance and the real part of the theoretical impedance, and the calibration imaginary part coefficient is determined based on the imaginary part of the measured impedance and the imaginary part of the theoretical impedance, including: When the real part impedance error between the measured real part and the theoretical real part is greater than the preset real part error, the calibration real part coefficient is determined based on the real part impedance error. When the imaginary impedance error between the measured imaginary impedance and the theoretical imaginary impedance is greater than the preset imaginary impedance error, the calibration imaginary coefficient is determined based on the imaginary impedance error.

[0007] Optionally, before inputting the real and imaginary calibration coefficients into the electrochemical impedance spectroscopy module, the following steps are also included: When the real part impedance error between the measured real part and the theoretical real part is less than or equal to the preset real part error, the calibration real part coefficient is used as the final calibration real part coefficient corresponding to the sampling frequency point. When the imaginary impedance error between the measured imaginary impedance and the theoretical imaginary impedance is less than or equal to the preset imaginary impedance error, the calibration imaginary coefficient is used as the final calibration imaginary coefficient corresponding to the sampling frequency point.

[0008] Optionally, after using the calibration imaginary part coefficients as the final calibration imaginary part coefficients corresponding to the sampling frequency points, the method further includes: Obtain the final real part coefficients and the final imaginary part coefficients corresponding to all sampling frequency points; Generate a calibration plot for the electrochemical impedance spectroscopy module.

[0009] Optionally, the calibration real part coefficient is determined based on the real part of the calibrated measured impedance and the real part of the theoretical impedance, and the calibration imaginary part coefficient is determined based on the imaginary part of the calibrated measured impedance and the imaginary part of the theoretical impedance, including: When the number of times the real part of the calibrated measured impedance is generated is less than a, the calibration real part coefficient is determined based on the real part of the calibrated measured impedance and the real part of the theoretical impedance. When the number of times the imaginary part of the calibrated measured impedance is generated is less than a, the calibration imaginary part coefficient is determined based on the imaginary part of the calibrated measured impedance and the imaginary part of the theoretical impedance; where a is a positive integer and a≥1.

[0010] Optionally, before obtaining the standard frequency band sequence, the following steps are also included: Send the output precharge command to the DC-DC converter; After receiving the first precharge completion signal from the DC-DC converter, an input precharge command is sent to the DC-DC converter. After receiving the second precharge completion signal from the DC converter, a start-up command is sent to the DC converter to control its operation.

[0011] According to a second aspect of the present invention, an electrochemical impedance spectroscopy detection and verification apparatus is provided for performing an electrochemical impedance spectroscopy detection and verification method. The detection and verification apparatus includes: The frequency band acquisition module is used to acquire a standard frequency band sequence; wherein the standard frequency band sequence includes n sampling frequency points; n is a positive integer and n≥1; The disturbance input module is used to input a disturbance current at the sampling frequency point into the detection and verification circuit according to the standard frequency band sequence. The impedance acquisition module is used to acquire the real part and the imaginary part of the measured impedance corresponding to the sampling frequency point. The calibration calculation module is used to determine the calibration real part coefficient based on the real part of the measured impedance and the real part of the theoretical impedance, and to determine the calibration imaginary part coefficient based on the imaginary part of the measured impedance and the imaginary part of the theoretical impedance. The calibration execution module is used to input the real and imaginary calibration coefficients into the electrochemical impedance spectroscopy module.

[0012] According to a third aspect of the present invention, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement a method for detecting and verifying electrochemical impedance spectroscopy.

[0013] According to a fourth aspect of the present invention, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements a method for detecting and verifying electrochemical impedance spectroscopy.

[0014] The technical solution of this invention obtains the real and imaginary parts of the measured impedance at different acquisition frequency points, determines the calibration real part coefficient based on the real and theoretical real parts of the measured impedance, determines the calibration imaginary part coefficient based on the imaginary and theoretical imaginary parts of the measured impedance, and re-inputs the calibration real and imaginary part coefficients into the electrochemical impedance spectroscopy module to calibrate the real and imaginary parts of the measured impedance. This achieves the verification of the electrochemical impedance spectroscopy module, thereby enabling a unified calibration method for the electrochemical impedance spectroscopy modules in different DC converters, ensuring the accuracy and reliability of the electrochemical impedance spectroscopy module test.

[0015] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a detection and verification circuit provided in an embodiment of the present invention; Figure 2 A flowchart of the first electrochemical impedance spectroscopy detection and verification method provided in this embodiment of the invention; Figure 3 This is a flowchart of the second electrochemical impedance spectroscopy detection and verification method provided in this embodiment of the invention; Figure 4 A flowchart of the third electrochemical impedance spectroscopy detection and verification method provided in this embodiment of the invention; Figure 5 A flowchart of the fourth electrochemical impedance spectroscopy detection and verification method provided in this embodiment of the invention; Figure 6 A flowchart of the fifth electrochemical impedance spectroscopy detection and verification method provided in this embodiment of the invention; Figure 7 A flowchart of the sixth electrochemical impedance spectroscopy detection and verification method provided in this embodiment of the invention; Figure 8 A flowchart of the seventh electrochemical impedance spectroscopy detection and verification method provided in this embodiment of the invention; Figure 9 A connection diagram of an electrochemical impedance spectroscopy detection and verification device provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of a computer device structure for a detection and verification method for electrochemical impedance spectroscopy, provided by an embodiment of the present invention. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0019] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0020] Figure 1 This is a schematic diagram of a detection and verification circuit provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the system includes: a host computer, an electronic source 2, a load 3, a DC-DC converter 4, and a calibration fixture 5. The electronic source 2 is electrically connected to the first terminal of the DC-DC converter 4, and the calibration fixture 5 is connected in series between the positive terminal of the electronic source 2 and the first terminal. The second terminal of the DC-DC converter 4 is electrically connected to the positive terminal of the load 3. The negative terminal of the load 3 is electrically connected to the third terminal of the DC-DC converter 4. The negative terminal of the electronic source 2 is electrically connected to the fourth terminal of the DC-DC converter 4. The DC-DC converter 4 includes an electrochemical impedance spectroscopy module 40. The host computer is communicatively connected to the DC-DC converter 4. The electrochemical impedance spectroscopy module 40, located within the DC-DC converter 4, can be used to analyze the impedance characteristics of the DC-DC converter 4. The calibration fixture 5 can be used to simulate the impedance characteristics of the fuel cell stack, specifically a resistor R. total Capacitor C d With resistance R F To form a series-parallel circuit, adjust the resistor R. total Capacitor C d With resistance R F Different parameter combinations can simulate different impedance characteristics. The detection and verification method in this embodiment of the invention is applied in the detection and verification circuit to verify the electrochemical impedance spectroscopy module 40 in the DC-DC converter 4. Figure 2 This is a flowchart illustrating the first electrochemical impedance spectroscopy detection and verification method provided in this embodiment of the invention. (Combined with...) Figure 1 and Figure 2As shown, the detection and verification method includes: S10. Obtain the standard frequency band sequence. The standard frequency band sequence includes n sampling frequency points; n is a positive integer and n≥1.

[0021] The standard frequency band sequence can be determined based on the actual operating requirements of the fuel cell, and this standard frequency band sequence can cover the operating frequency range of the electrochemical impedance spectroscopy module 40 and the fuel cell stack. For example, once the required operating frequency band is known, the operating frequency band can be divided into n sampling frequency points, namely [f1, f2, f3, ..., fn].

[0022] S11. Input the disturbance current of the sampling frequency point into the detection and verification circuit according to the standard frequency band sequence.

[0023] The impedance characteristics of the electrochemical impedance spectroscopy module 40 at different frequencies can be obtained by inputting perturbation currents of different frequencies.

[0024] For example, the input frequency is a perturbation current of frequency f1, the input frequency is a perturbation current of frequency f2, the input frequency is a perturbation current of frequency f3, ..., the input frequency is a perturbation current of frequency fn. It is understood that the detection and verification method in this embodiment of the invention calibrates each sampling frequency point of the electrochemical impedance spectroscopy module 40 separately. Therefore, the calibration of f1, f2, f3, ..., fn is performed sequentially; the calibration of the next sampling frequency point is performed only after the calibration of the current sampling frequency point is completed.

[0025] S12. Obtain the real part and imaginary part of the measured impedance corresponding to the sampling frequency point.

[0026] The electrochemical impedance spectroscopy module 40 can calculate the real and imaginary parts of the measured impedance. Based on the acquired parameters, the electrochemical impedance spectroscopy module 40 calculates the real and imaginary parts of the measured impedance using a fast Fourier transform and outputs them to the host computer.

[0027] S13. Determine the calibration real part coefficient based on the measured real part and the theoretical real part of the impedance, and determine the calibration imaginary part coefficient based on the measured imaginary part and the theoretical imaginary part of the impedance.

[0028] The real part of the theoretical impedance can be the real impedance value calculated based on the current sampling frequency, disturbance current, and calibration fixture 5; the imaginary part of the theoretical impedance can be the imaginary impedance value calculated based on the current sampling frequency, disturbance current, and calibration fixture 5.

[0029] The calibration real part coefficients are determined based on the deviation between the measured real part and the theoretical real part of the impedance. The real part calibration system can be used to calibrate the measured real part of the impedance in the electrochemical impedance spectroscopy module 40. Similarly, the calibration imaginary part coefficients are determined based on the deviation between the measured imaginary part and the theoretical imaginary part of the impedance. The imaginary part calibration system can be used to calibrate the measured imaginary part of the impedance in the electrochemical impedance spectroscopy module 40.

[0030] S14. Input the real part and imaginary part of the calibration coefficients into the electrochemical impedance spectroscopy module.

[0031] Specifically, the real part calibration coefficient and the imaginary part calibration coefficient are input into the electrochemical impedance spectroscopy module 40 to calibrate the real part of the measured impedance in the electrochemical impedance spectroscopy module 40 and to calibrate the imaginary part of the measured impedance in the electrochemical impedance spectroscopy module 40.

[0032] For example, the electrochemical impedance spectroscopy module 40 also includes a signal generation unit 403, a calibration unit 402, and a signal acquisition unit 401. When the detection and verification circuit is running stably, the host computer first acquires the standard frequency band sequence [f1, f2, f3,..., fn] and inputs a disturbance current with frequency f1 to the detection and verification current. The signal acquisition unit 401 of the electrochemical impedance spectroscopy module 40 acquires the response parameters and calculates the real and imaginary parts of the measured impedance. The signal generation unit 403 then outputs the real and imaginary parts of the measured impedance to the host computer. The host computer determines the calibration real part coefficients based on the real and theoretical real parts of the measured impedance, and determines the calibration imaginary part coefficients based on the imaginary and theoretical imaginary parts of the measured impedance. These calibration real and imaginary part coefficients are then input into the electrochemical impedance spectroscopy module 40. The calibration unit 402 in the electrochemical impedance spectroscopy module 40 calibrates the real and imaginary parts of the measured impedance based on the calibration real and imaginary part coefficients. After the f1 calibration of the electrochemical impedance spectroscopy module 40 is completed, continue to calibrate f2 until all sampling frequency points in the standard frequency band sequence are calibrated.

[0033] The technical solution of this invention obtains the real and imaginary parts of the measured impedance at different acquisition frequency points, determines the calibration real part coefficient based on the real and theoretical real parts of the measured impedance, determines the calibration imaginary part coefficient based on the imaginary and theoretical imaginary parts of the measured impedance, and re-inputs the calibration real and imaginary part coefficients into the electrochemical impedance spectroscopy module to calibrate the real and imaginary parts of the measured impedance. This achieves the verification of the electrochemical impedance spectroscopy module, thereby enabling a unified calibration method for the electrochemical impedance spectroscopy modules in different DC converters, ensuring the accuracy and reliability of the electrochemical impedance spectroscopy module test.

[0034] Based on the above embodiments, Figure 3 This is a flowchart of the second electrochemical impedance spectroscopy detection and verification method provided in this embodiment of the invention, combined with... Figure 1 and Figure 3 As shown, the detection and verification method includes: S20. Obtain the standard frequency band sequence.

[0035] S21. Input the disturbance current of the sampling frequency point into the detection and verification circuit according to the standard frequency band sequence.

[0036] S22. Obtain the real part and imaginary part of the measured impedance corresponding to the sampling frequency point.

[0037] S23. Determine the calibration real part coefficient based on the measured real part of the impedance and the theoretical real part of the impedance, and determine the calibration imaginary part coefficient based on the measured imaginary part of the impedance and the theoretical imaginary part of the impedance.

[0038] S24. Input the real part and imaginary part of the calibration coefficients into the electrochemical impedance spectroscopy module.

[0039] S25. Obtain the real part and imaginary part of the calibrated measured impedance corresponding to the sampling frequency point. The real part of the calibrated measured impedance is the real impedance value generated based on the calibration real part coefficients and the real part of the measured impedance; the imaginary part of the calibrated measured impedance is the imaginary impedance value generated based on the calibration imaginary part coefficients and the imaginary part of the measured impedance.

[0040] Specifically, when the calibration real part coefficients and calibration imaginary part coefficients are input into the electrochemical impedance spectroscopy module 40, the electrochemical impedance spectroscopy module 40 corrects the measured real part of the impedance according to the calibration real part coefficients to obtain the calibrated measured real part of the impedance, and outputs the calibrated measured real part of the impedance to the host computer; the electrochemical impedance spectroscopy module 40 corrects the measured imaginary part of the impedance according to the calibration imaginary part coefficients to obtain the calibrated measured imaginary part of the impedance, and outputs the calibrated measured imaginary part of the impedance to the host computer.

[0041] For example, the calibration unit 402 in the electrochemical impedance spectroscopy module 40 can calibrate the real part and the imaginary part of the measured impedance by combining the calibration real part coefficient and the calibration imaginary part coefficient, and then output the calibrated real part and the calibrated imaginary part of the measured impedance.

[0042] S26. Determine the calibration real part coefficient based on the real part of the calibrated measured impedance and the real part of the theoretical impedance, and determine the calibration imaginary part coefficient based on the imaginary part of the calibrated measured impedance and the imaginary part of the theoretical impedance.

[0043] After obtaining the real part of the calibrated measured impedance, calibration real part coefficients can be generated based on the real part of the theoretical impedance until the real part of the calibrated measured impedance is close to or equal to the real part of the theoretical impedance; after obtaining the imaginary part of the calibrated measured impedance, calibration imaginary part coefficients can be generated based on the imaginary part of the theoretical impedance until the imaginary part of the calibrated measured impedance is close to or equal to the imaginary part of the theoretical impedance.

[0044] S27. Input the real part and imaginary part of the calibration coefficients into the electrochemical impedance spectroscopy module.

[0045] For example, the signal acquisition unit 401 of the electrochemical impedance spectroscopy module 40 reacquires the response parameters under the f1 disturbance current and calculates the real part and imaginary part of the measured impedance using Fast Fourier Transform. Then, the calibration unit 402 corrects the real part of the measured impedance using calibration real part coefficients to generate a calibrated real part of the measured impedance. The calibration unit 402 also corrects the imaginary part of the measured impedance using calibration imaginary part coefficients to generate a calibrated imaginary part of the measured impedance. The host computer receives the calibrated real part and the calibrated imaginary part of the measured impedance. When the error between the calibrated real part and the theoretical real part of the impedance is still large, the calibration real part coefficients are determined based on the calibrated real part and the theoretical real part of the impedance. When the error between the calibrated imaginary part and the theoretical imaginary part of the impedance is still large, the calibration imaginary part coefficients are determined based on the calibrated imaginary part and the theoretical imaginary part of the impedance. This process continues until the values ​​are close to the theoretical real part and the theoretical imaginary part of the impedance, at which point the calibration at the f1 acquisition frequency point can be completed.

[0046] The technical solution of this invention achieves calibration of the electrochemical impedance spectroscopy module by inputting the calibration real part coefficient and calibration imaginary part coefficient into the module and correcting the measured real part and measured imaginary part of the impedance using the module. Simultaneously, it continues to determine the calibration real part coefficient based on the calibrated measured real part and theoretical real part of the impedance, and the calibration imaginary part coefficient based on the calibrated measured imaginary part and theoretical imaginary part of the impedance, until the calibration approaches the theoretical real part and theoretical imaginary part of the impedance, thus ensuring the accuracy of the electrochemical impedance spectroscopy module calibration.

[0047] Based on the above embodiments, Figure 4 This is a flowchart of the third electrochemical impedance spectroscopy detection and verification method provided in this embodiment of the invention, combined with... Figure 1 and Figure 4 As shown, the detection and verification method includes: S30. Obtain the standard frequency band sequence.

[0048] S31. Input the disturbance current of the sampling frequency point into the detection and verification circuit according to the standard frequency band sequence.

[0049] S32. Obtain the real part and imaginary part of the measured impedance corresponding to the sampling frequency point.

[0050] S33. Determine the calibration real part coefficient based on the measured real part of the impedance and the theoretical real part of the impedance, and determine the calibration imaginary part coefficient based on the measured imaginary part of the impedance and the theoretical imaginary part of the impedance.

[0051] S34. Input the real part and imaginary part of the calibration coefficients into the electrochemical impedance spectroscopy module.

[0052] S35. Obtain the real part and imaginary part of the calibrated measured impedance corresponding to the sampling frequency point.

[0053] S36. When the real impedance error between the measured real part and the theoretical real part is greater than the preset real part error, the calibration real part coefficient is determined based on the real impedance error.

[0054] The real impedance error can be the difference between the measured real impedance and the theoretical real impedance. When the real impedance error is greater than the preset real error, it indicates that the difference between the measured real impedance and the theoretical real impedance is large, and calibration is required. Therefore, the real impedance error is adaptively adjusted to obtain the calibration real coefficient.

[0055] S37. When the imaginary impedance error between the measured imaginary impedance and the theoretical imaginary impedance is greater than the preset imaginary impedance error, the calibration imaginary coefficient is determined based on the imaginary impedance error.

[0056] The imaginary impedance error can be the difference between the imaginary part of the measured impedance and the imaginary part of the theoretical impedance. When the imaginary impedance error is greater than the preset imaginary error, it indicates that the difference between the imaginary part of the measured impedance and the imaginary part of the theoretical impedance is large, and calibration is required. Therefore, the imaginary impedance error is adaptively adjusted to obtain the calibration imaginary coefficient.

[0057] S38. Input the real part and imaginary part of the calibration coefficients into the electrochemical impedance spectroscopy module.

[0058] The technical solution of this invention achieves adaptive adjustment of the calibration coefficients by determining the real part coefficient based on the real part impedance error and the imaginary part coefficient based on the imaginary part impedance error when the real part impedance error is greater than the preset real part error, thus ensuring the accuracy of the electrochemical impedance spectroscopy module calibration.

[0059] Based on the above embodiments, Figure 5 This is a flowchart of the fourth electrochemical impedance spectroscopy detection and verification method provided in this embodiment of the invention, combined with... Figure 1 and Figure 5 As shown, the detection and verification method includes: S40. Obtain the standard frequency band sequence.

[0060] S41. Input the disturbance current of the sampling frequency point into the detection and verification circuit according to the standard frequency band sequence.

[0061] S42. Obtain the real part and imaginary part of the measured impedance corresponding to the sampling frequency point.

[0062] S43. Determine the calibration real part coefficient based on the measured real part of the impedance and the theoretical real part of the impedance, and determine the calibration imaginary part coefficient based on the measured imaginary part of the impedance and the theoretical imaginary part of the impedance.

[0063] S44. Input the real part and imaginary part of the calibration coefficients into the electrochemical impedance spectroscopy module.

[0064] S45. Obtain the real part and imaginary part of the calibrated measured impedance corresponding to the sampling frequency point.

[0065] S46. When the real impedance error between the measured real part and the theoretical real part is greater than the preset real part error, the calibration real part coefficient is determined based on the real impedance error.

[0066] S47. When the imaginary impedance error between the measured imaginary impedance and the theoretical imaginary impedance is greater than the preset imaginary impedance error, the calibration imaginary coefficient is determined based on the imaginary impedance error.

[0067] S48. When the real impedance error between the measured real part and the theoretical real part is less than or equal to the preset real part error, the calibration real part coefficient is used as the final calibration real part coefficient corresponding to the sampling frequency point.

[0068] Specifically, when the real part impedance error is less than or equal to the preset real part error, it indicates that the measured real part of the impedance and the theoretical real part of the impedance are close. Therefore, the calibration real part coefficients in the calibration module of the current electrochemical impedance spectroscopy module 40 can be directly used as the final calibration real part coefficients. These final calibration real part coefficients are the actual calibration real part coefficients of the electrochemical impedance spectrum at the current sampling frequency point.

[0069] S49. When the imaginary impedance error between the measured imaginary impedance and the theoretical imaginary impedance is less than or equal to the preset imaginary impedance error, the calibration imaginary coefficient is used as the final calibration imaginary coefficient corresponding to the sampling frequency point.

[0070] When the imaginary impedance error is less than or equal to the preset imaginary error, it indicates that the measured imaginary impedance and the theoretical imaginary impedance are close. Therefore, the calibration imaginary coefficient in the calibration module of the current electrochemical impedance spectroscopy module 40 can be directly used as the final calibration imaginary coefficient. This final calibration imaginary coefficient is the actual calibration imaginary coefficient of the electrochemical impedance spectroscopy at the current sampling frequency point.

[0071] S491. Input the real part and imaginary part of the calibration coefficients into the electrochemical impedance spectroscopy module.

[0072] Understandably, after obtaining the final real part coefficients and the final imaginary part coefficients at the current sampling frequency, the calibration continues for the next sampling frequency point until all sampling frequency points have been traversed.

[0073] After obtaining the final real part coefficients and the final imaginary part coefficients of the calibration, the calibration coefficients of the electrochemical impedance spectroscopy module 40 at the current sampling frequency have been determined (final real part coefficients and final imaginary part coefficients of the calibration).

[0074] The technical solution of this invention determines the final calibration imaginary coefficient based on the imaginary impedance error when the imaginary impedance error between the measured imaginary impedance and the theoretical imaginary impedance is greater than a preset imaginary impedance error; when the real impedance error between the measured real impedance and the theoretical real impedance is less than or equal to the preset real impedance error, the calibration real coefficient is used as the final calibration real coefficient corresponding to the sampling frequency point, ensuring that the electrochemical impedance spectroscopy module can obtain parameters closest to the theoretical real and imaginary impedances when adjusted according to both the calibration real coefficient and the final calibration imaginary coefficient, thus ensuring the accuracy of the electrochemical impedance spectroscopy module calibration.

[0075] Based on the above embodiments, Figure 6 This is a flowchart of the fifth electrochemical impedance spectroscopy detection and verification method provided in this embodiment of the invention, combined with... Figure 1 and Figure 6 As shown, the detection and verification method includes: S50. Obtain the standard frequency band sequence.

[0076] S51. Input the disturbance current of the sampling frequency point into the detection and verification circuit according to the standard frequency band sequence.

[0077] S52. Obtain the real part and imaginary part of the measured impedance corresponding to the sampling frequency point.

[0078] S53. Determine the calibration real part coefficient based on the measured real part of the impedance and the theoretical real part of the impedance, and determine the calibration imaginary part coefficient based on the measured imaginary part of the impedance and the theoretical imaginary part of the impedance.

[0079] S54. Input the real part and imaginary part of the calibration coefficients into the electrochemical impedance spectroscopy module.

[0080] S55. Obtain the real part and imaginary part of the calibrated measured impedance corresponding to the sampling frequency point.

[0081] S56. When the real impedance error between the measured real part and the theoretical real part is greater than the preset real part error, the calibration real part coefficient is determined based on the real impedance error.

[0082] S57. When the imaginary impedance error between the measured imaginary impedance and the theoretical imaginary impedance is greater than the preset imaginary impedance error, the calibration imaginary coefficient shall be determined based on the imaginary impedance error.

[0083] S58. When the real impedance error between the measured real part and the theoretical real part is less than or equal to the preset real part error, the calibration real part coefficient is used as the final calibration real part coefficient corresponding to the sampling frequency point.

[0084] S59. When the imaginary impedance error between the measured imaginary impedance and the theoretical imaginary impedance is less than or equal to the preset imaginary impedance error, the calibration imaginary coefficient is used as the final calibration imaginary coefficient corresponding to the sampling frequency point.

[0085] S591. Obtain the final real part coefficients and the final imaginary part coefficients corresponding to all sampling frequency points.

[0086] After traversing all sampling frequency points, the final real part coefficients and the final imaginary part coefficients corresponding to all sampling frequency points will be obtained, thus completing the calibration of all frequency points of the electrochemical impedance spectroscopy module 40.

[0087] S592, Generate the calibration diagram for the electrochemical impedance spectroscopy module.

[0088] In order to better reflect the characteristics of the electrochemical impedance spectroscopy module 40, a calibration diagram of the electrochemical impedance spectroscopy module 40 can be generated. The horizontal axis of the calibration diagram can be the sampling frequency point, and the vertical axis can be the final calibration real part coefficient and the final calibration imaginary part coefficient.

[0089] S593. Input the real part and imaginary part of the calibration coefficients into the electrochemical impedance spectroscopy module.

[0090] Understandably, when calibrating multiple different electrochemical impedance spectroscopy modules 40, multiple calibration diagrams can be generated, facilitating performance comparison of different electrochemical impedance spectroscopy modules 40.

[0091] In some embodiments, the calibration diagram may also include the real part and imaginary part of the measured impedance before calibration at different sampling frequency points, and may also include the real part of the measured impedance after calibration by the final calibration real part coefficient, and the imaginary part of the measured impedance after calibration by the final calibration imaginary part coefficient.

[0092] Based on the above embodiments, Figure 7 This is a flowchart of the sixth electrochemical impedance spectroscopy detection and verification method provided in this embodiment of the invention, combined with... Figure 1 and Figure 7 As shown, the detection and verification method includes: S60. Obtain the standard frequency band sequence.

[0093] S61. Input the disturbance current of the sampling frequency point into the detection and verification circuit according to the standard frequency band sequence.

[0094] S62. Obtain the real part and imaginary part of the measured impedance corresponding to the sampling frequency point.

[0095] S63. Determine the calibration real part coefficient based on the measured real part and the theoretical real part of the impedance, and determine the calibration imaginary part coefficient based on the measured imaginary part and the theoretical imaginary part of the impedance.

[0096] S64. Input the real part and imaginary part of the calibration coefficients into the electrochemical impedance spectroscopy module.

[0097] S65. Obtain the real part and imaginary part of the calibrated measured impedance corresponding to the sampling frequency point.

[0098] S66. When the number of times the real part of the calibrated measured impedance is generated is less than a, the calibration real part coefficient is determined based on the real part of the calibrated measured impedance and the real part of the theoretical impedance.

[0099] Specifically, whenever a calibration real part coefficient is input into the electrochemical impedance spectroscopy module 40, a corresponding calibration real part of the measured impedance is generated. The number of times the calibration real part of the measured impedance is generated represents the number of times the calibration real part coefficient is generated, and also represents the number of times the measured impedance real part is calibrated. 'a' can be a critical value for whether to stop continuing calibration.

[0100] When the number of times the real part of the measured impedance is generated is less than a, it means that the real part calibration coefficient can continue to be generated for calibration. When the number of times the real part of the measured impedance is generated is greater than or equal to a, it means that too many calibrations have been performed and the impedance has not yet been calibrated to be close to the theoretical real part. An anomaly is determined and calibration is stopped.

[0101] S67. When the number of times the imaginary part of the calibrated measured impedance is generated is less than a, the calibration imaginary part coefficient is determined based on the imaginary part of the calibrated measured impedance and the imaginary part of the theoretical impedance. Where a is a positive integer and a≥1.

[0102] Whenever a calibration imaginary part coefficient is input into the electrochemical impedance spectroscopy module 40, a corresponding calibration imaginary part of the measured impedance is generated. The number of times the calibration imaginary part of the measured impedance is generated represents the number of times the calibration imaginary part coefficient is generated, and also represents the number of times the measured impedance imaginary part is calibrated. 'a' can be a critical value for whether to stop continuing calibration.

[0103] When the number of times the imaginary part of the measured impedance is generated is less than a, it means that the calibration imaginary part coefficient can continue to be generated for calibration. When the number of times the imaginary part of the measured impedance is generated is greater than or equal to a, it means that too many calibrations have been performed and the impedance has not yet been calibrated to be close to the theoretical imaginary part. An abnormality is determined and calibration is stopped.

[0104] S68. Input the real part and imaginary part of the calibration coefficients into the electrochemical impedance spectroscopy module.

[0105] The technical solution of this invention improves the reliability and accuracy of the electrochemical impedance spectroscopy module 40 by judging the number of times the real part of the calibrated measured impedance is generated and the number of times the imaginary part of the calibrated measured impedance is generated, thus ensuring timely alarm when abnormal situations occur.

[0106] Based on the above embodiments, Figure 8 This is a flowchart of the seventh electrochemical impedance spectroscopy detection and verification method provided in this embodiment of the invention, combined with... Figure 1 and Figure 8 As shown, the detection and verification method includes: S70 sends an output precharge command to the DC-DC converter.

[0107] The purpose of the pre-charge command issued by the host computer is to slowly charge the output capacitor of DC converter 4, so as to avoid the large current surge when the contactor is closed directly.

[0108] S71. After receiving the first precharge completion signal from the DC-DC converter, send an input precharge command to the DC-DC converter.

[0109] When DC-DC converter 4 completes pre-charging, it will send a first pre-charging completion signal to the host computer. The host computer will then send an input pre-charging command to DC-DC converter 4 to slowly charge the input capacitor of DC-DC converter 4, avoiding the large current surge when the input side is directly connected to the power supply.

[0110] S72. After receiving the second precharge completion signal from the DC converter, a start-up command is sent to the DC converter to control its operation.

[0111] When the DC converter 4 has completed its pre-charge, it will send a second pre-charge completion signal to the host computer. The host computer will then issue a power-on command and pull the load to the preset current to ensure that the DC converter 4 enters a stable operating state.

[0112] S73. Obtain the standard frequency band sequence.

[0113] S74. Input the disturbance current of the sampling frequency point to the detection and verification circuit according to the standard frequency band sequence.

[0114] S75. Obtain the real part and imaginary part of the measured impedance corresponding to the sampling frequency point.

[0115] S76. Determine the calibration real part coefficient based on the measured real part and the theoretical real part of the impedance, and determine the calibration imaginary part coefficient based on the measured imaginary part and the theoretical imaginary part of the impedance.

[0116] S77. Input the real part and imaginary part of the calibration coefficients into the electrochemical impedance spectroscopy module.

[0117] The technical solution of this invention ensures that the DC-DC converter is pre-charged and runs stably before testing and verification, thereby guaranteeing the accuracy and reliability of the testing and verification.

[0118] Based on the same inventive concept. Figure 9 A connection diagram of an electrochemical impedance spectroscopy detection and verification device provided in an embodiment of the present invention is shown below. Figure 9 As shown, this embodiment of the invention provides a detection and verification device for electrochemical impedance spectroscopy, used to perform a detection and verification method for electrochemical impedance spectroscopy. The detection and verification device includes: The frequency band acquisition module 100 is used to acquire a standard frequency band sequence; wherein the standard frequency band sequence includes n sampling frequency points; n is a positive integer and n≥1; The disturbance input module 200 is used to input a disturbance current at a sampling frequency point into the detection and verification circuit according to a standard frequency band sequence. Impedance acquisition module 300 is used to acquire the real part and imaginary part of the measured impedance corresponding to the sampling frequency point; The calibration calculation module 400 is used to determine the calibration real part coefficient based on the measured real part and the theoretical real part of the impedance, and to determine the calibration imaginary part coefficient based on the measured imaginary part and the theoretical imaginary part of the impedance. The calibration execution module 500 is used to input the real and imaginary calibration coefficients into the electrochemical impedance spectroscopy module.

[0119] The electrochemical impedance spectroscopy detection and verification device provided in this embodiment of the invention can be used to execute any of the electrochemical impedance spectroscopy detection and verification methods provided in the above embodiments, has corresponding functional modules, and has the same technical effect.

[0120] Based on the same inventive concept, embodiments of the present invention also provide a computer device. Figure 10 This is a schematic diagram of a computer device structure for a detection and verification method applied to electrochemical impedance spectroscopy according to an embodiment of the present invention, as shown below. Figure 10 As shown, it includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the processor executes the program, it implements a method for detecting and verifying electrochemical impedance spectroscopy.

[0121] The term "computer equipment" is intended to refer to various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Computer equipment can also refer to various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0122] like Figure 10As shown, the computer device 50 includes at least one processor 51 and a memory, such as a read-only memory 52 and a random access memory 53, communicatively connected to the at least one processor 51. The memory stores computer programs executable by the at least one processor. The processor 51 can perform various appropriate actions and processes based on the computer program stored in the read-only memory 52 or loaded from storage unit 58 into the random access memory 53. The random access memory 53 may also store various programs and data required for the operation of the computer device 50. The processor 51, read-only memory 52, and random access memory 53 are interconnected via a bus 54. An I / O interface 55 is also connected to the bus 54.

[0123] Multiple components in computer device 50 are connected to I / O interface 55, including: input unit 56, such as keyboard, mouse, etc.; output unit 57, such as various types of monitors, speakers, etc.; storage unit 58, such as disk, optical disk, etc.; and communication unit 59, such as network card, modem, wireless transceiver, etc. Communication unit 59 allows computer device 50 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0124] Processor 51 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 51 include, but are not limited to, central processing units, graphics processing units, various special-purpose artificial intelligence computing chips, various processors running machine learning model algorithms, digital signal processors, and any suitable processor, controller, microcontroller, etc. Processor 51 performs the various methods and processes described above, such as detection and verification methods applied to electrochemical impedance spectroscopy.

[0125] Based on the same inventive concept, embodiments of the present invention also provide a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a method for detecting and verifying electrochemical impedance spectroscopy.

[0126] Of course, the computer-readable storage medium provided in the embodiments of the present invention has computer-executable instructions that are not limited to the method operations described above, and can also perform related operations in the electrochemical impedance spectroscopy detection and verification method provided in any embodiment of the present invention. (Continue to refer to...) Figure 10As shown, it is tangibly contained in a computer-readable storage medium, such as storage unit 58. In some embodiments, part or all of the computer program may be loaded and / or installed on the computer device 50 via read-only memory 52 and / or communication unit 59. When the computer program is loaded into random access memory 53 and executed by processor 51, one or more steps of the detection and verification method for electrochemical impedance spectroscopy described above may be performed. Alternatively, in other embodiments, processor 51 may be configured by any other suitable means (e.g., by means of firmware) to perform the detection and verification method for electrochemical impedance spectroscopy.

[0127] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays, application-specific integrated circuits (ASICs), application-specific standard products (ASICs), systems-on-a-chip (SoCs), payload programmable logic devices, computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0128] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0129] In the context of embodiments of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory, read-only memory, erasable programmable read-only memory, optical fibers, portable compact disk read-only memory, optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0130] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0131] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for detecting and verifying electrochemical impedance spectroscopy, characterized in that, It is used in detection and verification circuits; The detection and verification circuit includes: a host computer, an electronic source, a load, a DC-DC converter, and a verification fixture; the electronic source is electrically connected to a first terminal of the DC-DC converter, and the verification fixture is connected in series between the positive terminal of the electronic source and the first terminal; the second terminal of the DC-DC converter is electrically connected to the positive terminal of the load; the negative terminal of the load is electrically connected to a third terminal of the DC-DC converter; the negative terminal of the electronic source is electrically connected to a fourth terminal of the DC-DC converter; the DC-DC converter includes an electrochemical impedance spectroscopy module; the host computer is communicatively connected to the DC-DC converter. The detection and verification method includes: Obtain a standard frequency band sequence; wherein the standard frequency band sequence includes n sampling frequency points; n is a positive integer and n≥1; According to the standard frequency band sequence, the perturbation current at the sampling frequency point is input to the detection and verification circuit; Obtain the real part and imaginary part of the measured impedance corresponding to the sampling frequency point; The calibration real part coefficient is determined based on the measured real part and the theoretical real part of the impedance, and the calibration imaginary part coefficient is determined based on the measured imaginary part and the theoretical imaginary part of the impedance. The real part coefficient and the imaginary part coefficient of the calibration are input into the electrochemical impedance spectroscopy module.

2. The detection and verification method according to claim 1, characterized in that, After inputting the real and imaginary calibration coefficients into the electrochemical impedance spectroscopy module, the method further includes: Obtain the real part and imaginary part of the calibrated measured impedance corresponding to the sampling frequency point; wherein, the real part of the calibrated measured impedance is the real part value of the impedance generated based on the calibration real part coefficient and the measured real impedance; the imaginary part of the calibrated measured impedance is the imaginary part value of the impedance generated based on the calibration imaginary part coefficient and the measured imaginary impedance. The calibration real part coefficient is determined based on the real part of the calibrated measured impedance and the real part of the theoretical impedance, and the calibration imaginary part coefficient is determined based on the imaginary part of the calibrated measured impedance and the imaginary part of the theoretical impedance. The real part coefficient and the imaginary part coefficient of the calibration are input into the electrochemical impedance spectroscopy module.

3. The detection and verification method according to claim 1 or 2, characterized in that, The calibration real part coefficient is determined based on the measured real part and the theoretical real part of the impedance, and the calibration imaginary part coefficient is determined based on the measured imaginary part and the theoretical imaginary part of the impedance, including: When the real part impedance error between the measured real part and the theoretical real part is greater than the preset real part error, the calibration real part coefficient is determined based on the real part impedance error. When the imaginary impedance error between the measured imaginary impedance and the theoretical imaginary impedance is greater than the preset imaginary impedance error, the calibration imaginary coefficient is determined based on the imaginary impedance error.

4. The detection and verification method according to claim 3, characterized in that, Before inputting the real and imaginary calibration coefficients into the electrochemical impedance spectroscopy module, the following steps are also included: When the real part impedance error between the measured real part and the theoretical real part is less than or equal to the preset real part error, the calibration real part coefficient is used as the final calibration real part coefficient corresponding to the sampling frequency point. When the imaginary impedance error between the measured imaginary impedance and the theoretical imaginary impedance is less than or equal to the preset imaginary error, the calibration imaginary coefficient is used as the final calibration imaginary coefficient corresponding to the sampling frequency point.

5. The detection and verification method according to claim 4, characterized in that, After using the calibration imaginary part coefficient as the final calibration imaginary part coefficient corresponding to the sampling frequency point, the method further includes: Obtain the final real part coefficients and the final imaginary part coefficients corresponding to all the sampling frequency points; Generate a calibration plot for the electrochemical impedance spectroscopy module.

6. The detection and verification method according to claim 2, characterized in that, The calibration real part coefficient is determined based on the real part of the measured calibration impedance and the real part of the theoretical impedance, and the calibration imaginary part coefficient is determined based on the imaginary part of the measured calibration impedance and the imaginary part of the theoretical impedance, including: When the number of times the real part of the calibrated measured impedance is generated is less than a, the calibration real part coefficient is determined based on the real part of the calibrated measured impedance and the real part of the theoretical impedance. When the number of times the imaginary part of the calibrated measured impedance is generated is less than a, the calibration imaginary part coefficient is determined based on the imaginary part of the calibrated measured impedance and the imaginary part of the theoretical impedance; where a is a positive integer and a≥1.

7. The detection and verification method according to claim 1, characterized in that, Before obtaining the standard frequency band sequence, the following steps are also included: Send an output precharge command to the DC-DC converter; After receiving the first precharge completion signal from the DC-DC converter, an input precharge command is sent to the DC-DC converter. After receiving the second precharge completion signal from the DC-DC converter, a power-on command is sent to the DC-DC converter to control its operation.

8. A detection and verification device for electrochemical impedance spectroscopy, characterized in that, The detection and verification device for performing the electrochemical impedance spectroscopy detection and verification method according to any one of claims 1-7 includes: A frequency band acquisition module is used to acquire a standard frequency band sequence; wherein the standard frequency band sequence includes n sampling frequency points; n is a positive integer and n≥1; The perturbation input module is used to input the perturbation current of the sampling frequency point to the detection and verification circuit according to the standard frequency band sequence; An impedance acquisition module is used to acquire the real part and the imaginary part of the measured impedance corresponding to the sampling frequency point. The calibration calculation module is used to determine the calibration real part coefficient based on the measured real part of the impedance and the theoretical real part of the impedance, and to determine the calibration imaginary part coefficient based on the measured imaginary part of the impedance and the theoretical imaginary part of the impedance. The calibration execution module is used to input the real part coefficients and the imaginary part coefficients of the calibration into the electrochemical impedance spectroscopy module.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the detection and verification method as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the detection and verification method as described in any one of claims 1-7.

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