Electrolytic cell high-frequency impedance inspection system

Abstract

The utility model provides an electrolytic bath high-frequency impedance inspection system, which is characterized in that an acquisition line of a voltage acquisition module is connected with a multi-channel inspection module, a sense wire harness of an impedance measurement module is connected with the multi-channel inspection module, and a plurality of PEM electrolytic baths are connected in series between an anode and a cathode of a direct-current power supply; a plurality of groups of sense wire harnesses of the multi-channel inspection module are respectively connected to positive and negative pole plates of a plurality of PEM electrolytic cells, the alternating current excitation module is connected with the direct current power supply in parallel, and the measurement control module is respectively in communication connection with the voltage acquisition module, the impedance measurement module, the multi-channel inspection module and the alternating current excitation module; according to the utility model, data measured by the impedance measurement module and the voltage acquisition module can be read at the same time, so that high-frequency impedance values and voltage values of a plurality of PEM electrolytic baths are tested, recorded and analyzed, the defects of high cost and small current measurement range of an electrochemical workstation are overcome, and the influence of a power supply on internal resistance measurement is solved.

Description

Technical Field

[0001] This utility model relates to the field of high-frequency impedance measurement technology, and in particular to a high-frequency impedance inspection system for electrolytic cells. Background Technology

[0002] The performance of the electrolyzer directly affects the hydrogen production efficiency of the entire system. High-frequency impedance measurement technology can monitor the operating status of the electrolyzer in real time, providing an efficient and accurate technical means for the polarization analysis of the electrolyzer.

[0003] Durability testing of electrolytic cells requires simultaneous testing of multiple electrolytic cells. Currently, high-frequency impedance testing of electrolytic cells typically relies on frequency sweeping by an electrochemical workstation or the use of a power supply with an internal resistance meter and impedance converter. However, each electrochemical workstation can only monitor one electrolytic cell. Simultaneous testing of multiple electrolytic cells requires the configuration of multiple electrochemical workstations, which is costly, complex to operate, difficult to wire, and time-consuming. The testing conditions and application scenarios are limited to electrolytic cell shutdown testing and cannot meet the testing requirements of various operating conditions of electrolytic cells. Summary of the Invention

[0004] The purpose of this invention is to provide a high-frequency impedance inspection system for electrolytic cells, which supplies power to the electrolytic cells via a DC power supply and uses an impedance measurement module to monitor the impedance of multiple PEM electrolytic cells online.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A high-frequency impedance inspection system for electrolytic cells is characterized by comprising a voltage acquisition module, an impedance measurement module, a multi-channel inspection module, a measurement control module, a DC power supply, and an AC excitation module. The acquisition line of the voltage acquisition module is connected to the multi-channel inspection module, the sense harness of the impedance measurement module is connected to the multi-channel inspection module, multiple PEM electrolytic cells are connected in series between the positive and negative terminals of the DC power supply, multiple sets of sense harnesses of the multi-channel inspection module are respectively connected to the positive and negative plates of the multiple PEM electrolytic cells, the AC excitation module is connected in parallel with the DC power supply, and the measurement control module is communicatively connected to the voltage acquisition module, the impedance measurement module, the multi-channel inspection module, and the AC excitation module.

[0007] Furthermore, the sense-h and sense-l harnesses of the impedance measurement module are connected to the multi-channel inspection module, and the communication line of the impedance measurement module is connected to the measurement control module.

[0008] Furthermore, the multiple sets of sense-h and sense-l harnesses of the multi-channel inspection module are respectively connected to the positive and negative plates of multiple PEM electrolytic cells, and the communication line of the multi-channel inspection module is connected to the measurement and control module.

[0009] Furthermore, the source-h and source-l harnesses of the AC excitation module are connected in parallel with the positive and negative terminals of the DC power supply, and the communication line of the AC excitation module is connected to the measurement and control module.

[0010] This utility model's impedance measurement module is used to test the impedance of an electrolytic cell. A DC power supply powers multiple PEM electrolytic cells, a multi-channel inspection module inspects the impedance and voltage values ​​of multiple electrolytic cells, and a measurement and control module controls the switching of the inspection channels of the multi-channel inspection module, the excitation signal output of the AC excitation module, and the DC output of the DC power supply.

[0011] This invention can simultaneously read data measured by the impedance measurement module and the voltage acquisition module, thereby testing and recording the high-frequency impedance and voltage values ​​of multiple PEM electrolyzers. It solves the problems of high cost and small current measurement range of electrochemical workstations, and also solves the problem of the influence of power supply on the measured internal resistance.

[0012] This invention can both power the electrolytic cell with DC power and perform high-frequency impedance testing on multiple electrolytic cells using a multi-channel inspection instrument, thereby maximizing cost-effectiveness. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the system structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the eight-channel high-frequency impedance test results for an example.

[0015] Figure 3 This is a schematic diagram of the eight-channel inspection voltage test results for an example.

[0016] Figure label:

[0017] 1. Voltage acquisition module; 2. Impedance measurement module; 3. Multi-channel inspection module; 4. Measurement control module.

[0018] 5 DC power supply, 6 AC excitation module, 7 PEM electrolytic cell. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] This embodiment discloses a high-frequency impedance inspection system for an electrolytic cell, including a voltage acquisition module 1, an impedance measurement module 2, a multi-channel inspection module 3, a measurement control module 4, a DC power supply 5, and an AC excitation module 6.

[0021] like Figure 1 As shown, the multi-channel inspection module 3 is an eight-channel inspection module. The acquisition line of the voltage acquisition module 1 is connected to the multi-channel inspection module 3. The sense-h and sense-l wire harnesses of the impedance measurement module 2 are connected to the multi-channel inspection module 3. The communication line of the impedance measurement module 2 is connected to the measurement control module 4.

[0022] Eight PEM electrolytic cells 7 are connected in series between the positive and negative terminals of the DC power supply 5. The eight sets of sense-h and sense-l wire harnesses of the multi-channel inspection module 3 are connected to the positive and negative plates of the eight PEM electrolytic cells 7 respectively. The communication line of the multi-channel inspection module 3 is connected to the measurement and control module 4.

[0023] The source-h and source-l harnesses of the AC excitation module 6 are connected in parallel with the positive and negative terminals of the DC power supply 5, and the communication line of the AC excitation module 6 is connected to the measurement and control module 4.

[0024] The measurement and control module 4 is connected to the voltage acquisition module 1, the impedance measurement module 2, the multi-channel inspection module 3, and the AC excitation module 6 for communication.

[0025] The test method of a high-frequency impedance inspection system for PEM electrolyzers in this embodiment is as follows: Figure 1 As shown, it includes the following steps:

[0026] Step S1) Connect the acquisition line of voltage acquisition module 1 to multi-channel inspection module 3, and connect the communication line to measurement control module 4;

[0027] Step S2) Connect the sense-h and sense-l harnesses of the impedance measurement module 2 to the multi-channel inspection module 3, and connect the communication line to the measurement control module 4;

[0028] Step S3) Connect the eight sets of sense-h and sense-l wire harnesses of the multi-channel inspection module 3 to the positive and negative terminals of the eight PEM electrolytic cells 7 respectively, and connect the communication line of the inspection module 3 to the measurement and control module 4.

[0029] Step S4) Connect the positive terminal of the DC power supply 5 module to the positive terminal of the first PEM electrolytic cell, connect the negative terminal of the first PEM electrolytic cell to the positive terminal of the second PEM electrolytic cell, and then connect them in series to the positive terminal of the eighth PEM electrolytic cell. Connect the negative terminal of the eighth PEM electrolytic cell to the negative terminal of the DC power supply 5. Connect the communication line of the DC power supply 5 to the measurement and control module 4.

[0030] Step S5) The source-h and source-l harnesses of the AC excitation module 6 are connected in parallel to the positive and negative terminals of the DC power supply 5, respectively, and the communication line of the AC excitation module 6 is connected to the measurement and control module 4.

[0031] Step S6) The DC power supply 5 is controlled by the measurement control module 4 to output DC current, preferably 50A, and the AC excitation module 6 is controlled by the measurement control module 4 to output AC excitation current signal, preferably 100mA, with an AC frequency of 1000Hz.

[0032] Step S7) The multi-channel inspection module 3 monitors the high-frequency impedance and voltage values ​​of the 8 PEM electrolytic cells 7 measured by the impedance measurement module 2 and the voltage acquisition module 1, and the measurement control module 4 reads and records them.

[0033] The high-frequency impedance and voltage test results of this embodiment are shown in [reference]. Figure 2 and Figure 3 .

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high frequency impedance patrol system for an electrolytic cell, characterized in that, It includes voltage acquisition module (1), impedance measurement module (2), multi-channel inspection module (3), measurement control module (4), DC power supply (5) and AC excitation module (6), the acquisition line of voltage acquisition module (1) is connected with multi-channel inspection module (3), the sense line bundle of impedance measurement module (2) is connected with multi-channel inspection module (3), the positive and negative poles of DC power supply (5) are connected with multiple PEM electrolytic cell (7) in series, multiple groups of sense line bundle of multi-channel inspection module (3) are connected to the positive and negative pole plate of multiple PEM electrolytic cell (7) respectively, AC excitation module (6) is connected with DC power supply (5) in parallel, measurement control module (4) is connected with voltage acquisition module (1), impedance measurement module (2), multi-channel inspection module (3) and AC excitation module (6) respectively.

2. The high frequency impedance tour system of an electrolyzer of claim 1, wherein, The sense-h and sense-l line bundle of impedance measurement module (2) is connected with multi-channel inspection module (3), the communication line of impedance measurement module (2) is connected with measurement control module (4).

3. The high frequency impedance tour system of an electrolyzer of claim 1, wherein, Multiple groups of sense-h and sense-l line bundle of multi-channel inspection module (3) are connected with the positive and negative pole plate of multiple PEM electrolytic cell (7) respectively, the communication line of multi-channel inspection module (3) is connected with measurement control module (4).

4. The high frequency impedance tour system of an electrolyzer of claim 1, wherein, The source-h and source-l line bundle of AC excitation module (6) are connected with the positive and negative poles of DC power supply (5) in parallel, the communication line of AC excitation module (6) is connected with measurement control module (4). The sense-h and sense-l line bundle of impedance measurement module (2) is connected with multi-channel inspection module (3), the communication line of impedance measurement module (2) is connected with measurement control module (4). Multiple groups of sense-h and sense-l line bundle of multi-channel inspection module (3) are connected with the positive and negative pole plate of multiple PEM electrolytic cell (7) respectively, the communication line of multi-channel inspection module (3) is connected with measurement control module (4). The source-h and source-l line bundle of AC excitation module (6) are connected with the positive and negative poles of DC power supply (5) in parallel, the communication line of AC excitation module (6) is connected with measurement control module (4).

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