Diaphragm surface resistance testing device

Abstract

The embodiment discloses a diaphragm surface resistance testing device which comprises a base, an insulating sleeve fixed on the base, a lower electrode assembly and an upper electrode assembly, a first cavity and a second cavity which are communicated with each other are defined in the insulating sleeve, one side of the insulating sleeve is provided with a liquid inlet channel and a liquid outlet channel which are communicated with the second cavity, and the liquid inlet channel and the liquid outlet channel are communicated with the upper electrode assembly. A cushion cover communicated with the second cavity is arranged at one end, far away from the base, of the insulating sleeve; a first cutting edge is arranged at the top of the cushion cover; the lower electrode assembly comprises a lower electrode plate arranged in the first cavity; the upper electrode assembly comprises a movable frame and an upper electrode plate fixed to the fixed frame, the upper electrode plate right faces the lower electrode plate, a second cutting edge is arranged at the end, facing the lower electrode plate, of the upper electrode plate, and the movable frame can be close to or away from the lower electrode plate in the second direction. The device is simple and convenient to operate, can realize automatic blanking, does not need manual cutting in advance, can reduce test errors, can realize pretreatment integration and zero-spacing test of the diaphragm to be tested, and can further improve test accuracy and test efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen energy, in particular to a diaphragm surface resistance testing device. Background Art

[0002] A diaphragm is a thin film used to separate the positive and negative electrodes during an electrolysis reaction to prevent direct reaction in the electrolytic cell and loss of energy. In the structure of an alkaline water electrolytic hydrogen production cell, the diaphragm is one of the key inner components. The performance of the diaphragm determines the interfacial structure, internal resistance, etc. of the electrolytic cell, directly affecting the capacity, cycle, and safety performance of the cell. A diaphragm with excellent performance plays an important role in improving the comprehensive performance of the cell. Therefore, selecting a suitable diaphragm for the corresponding cell is beneficial to reducing power consumption, as well as reducing the development cost and operation and maintenance cost of the product, and enhancing the comprehensive economic benefits of the product.

[0003] Surface resistance is an important data characterizing the electrical performance of the diaphragm. If the resistance of the diaphragm is too large, it is not convenient for the transmission of ions reacting on the electrode surface, which will lead to a decline in cell performance. Therefore, improving the contact performance of the electrolyte on the electrode surface and reducing the surface resistance of the electrolyte are important means to improve cell performance. Currently, the traditional form of an H-shaped electrolytic cell is usually used to detect the surface resistance of the diaphragm, that is: first, the diaphragm sample is cut into a test size, and then it is immersed in a 40% potassium hydroxide solution for pre-treatment. Before the test, the resistance of the electrolyte between the two electrodes is measured first, and then the pre-treated diaphragm sample is placed between the two electrodes, and the resistance of the diaphragm plus the electrolyte is measured. Finally, the surface resistance of the diaphragm is calculated based on the above test data. However, the above test method requires pre-cutting the diaphragm sample and pre-soaking and pre-treating the diaphragm sample, which results in cumbersome operation, large test errors, and low efficiency. Summary of the Utility Model

[0004] In order to solve the above technical problems, the utility model provides a diaphragm surface resistance testing device.

[0005] The embodiment of the present application provides a diaphragm surface resistance testing device, including:

[0006] A base;

[0007] An insulating sleeve fixed on the surface of the base. A first cavity and a second cavity that are connected and communicated are defined inside the insulating sleeve. The first cavity is located below the second cavity. One side of the insulating sleeve is provided with a liquid inlet channel and a liquid outlet channel that are connected to the second cavity and extend in a first direction. And a gasket sleeve is provided at one end of the insulating sleeve away from the base. The gasket sleeve is provided with an inner cavity that communicates with the second cavity, and a first cutting edge is provided along the outer edge of the inner cavity at the top of the gasket sleeve;

[0008] A lower electrode assembly, which includes a lower electrode plate disposed in the first cavity;

[0009] An upper electrode assembly, which includes a movable frame and an upper electrode plate. The upper electrode plate is fixed on the movable frame, faces the lower electrode plate, and a second cutting edge is provided at one end of the upper electrode plate facing the lower electrode plate. The movable frame can approach or move away from the lower electrode plate along a second direction; wherein, the second direction is perpendicular to the first direction;

[0010] Both the lower electrode plate and the upper electrode plate are electrically connected to a resistance tester.

[0011] In one embodiment, a plurality of first liquid storage channels extending along the second direction are annularly distributed on the inner wall of the second cavity. A second liquid storage channel arranged in a ring is defined between the first liquid storage channel and the first cavity, and the second liquid storage channel is communicated with the first liquid storage channel.

[0012] In one embodiment, the liquid inlet channel is opened at 1 / 3 of the distance from the top of the first liquid storage channel.

[0013] In one embodiment, the movable frame includes a frame body and an insulating rod arranged along the second direction. The frame body is movably arranged above the base. One end of the insulating rod is connected to the frame body, and the upper electrode plate is fixed at the other end of the insulating rod.

[0014] In one embodiment, a transmission screw rod on the same side as the insulating sleeve is further included. One end of the transmission screw rod is connected to the surface of the base, and the other end of the transmission screw rod extends along the second direction. The frame body is threadedly connected to the transmission screw rod;

[0015] Wherein, when the transmission screw rod rotates, the frame body can move up and down along the transmission screw rod.

[0016] In one embodiment, the thickness of the lower electrode plate is equal to or greater than the depth of the first cavity.

[0017] In one embodiment, a liquid circulation system is further included. The liquid circulation system is respectively connected to the liquid inlet channel and the liquid outlet channel through a liquid inlet pipe and a liquid outlet pipe.

[0018] In one embodiment, a through hole extending along the second direction is opened on the insulating sleeve. The through hole is communicated with the first cavity so that a wire can extend into the first cavity through the through hole and be connected to the lower electrode plate.

[0019] The beneficial effects of the above technical solutions provided by the embodiments of the present application compared with the prior art are as follows:

[0020] Inside the insulating sleeve, a first cavity and a second cavity that communicate with each other are defined. An inlet channel and an outlet channel that communicate with the second cavity are provided on one side of the insulating sleeve, so that the liquid required for testing can be injected into the insulating sleeve. During testing, the diaphragm is placed on the top of the cushion sleeve, and then the movable frame is driven to move, so as to drive the upper electrode plate to press down the diaphragm. As the movable frame continues to move, the second cutting edge of the upper electrode plate cooperates with the first cutting edge at the top of the cushion sleeve to cut the diaphragm sample, so that the cut sample falls into the second cavity for soaking pretreatment. After the sample soaking treatment is completed, the upper electrode plate continues to press down, so that the diaphragm sample is clamped between the upper electrode plate and the lower electrode plate. Until the pressure received by the diaphragm sample reaches the clamping force simulating the actual environment, the upper electrode plate stops pressing down. Finally, the AC impedance of the electrolyte between the upper electrode plate and the lower electrode plate under a constant pressure is measured, so as to obtain the surface resistance of the diaphragm. The operation is simple, automatic blanking can be realized, manual pre-cutting is not required, test errors can be reduced. At the same time, the inside of the insulating sleeve is designed as a first cavity and a second cavity that communicate with each other, which can realize the integration of pretreatment and zero-spacing testing of the diaphragm to be tested, and can further improve the test accuracy and test efficiency. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of a device for testing the surface resistance of a diaphragm according to the present application;

[0022] Figure 2 is a schematic structural diagram of the insulating sleeve in a device for testing the surface resistance of a diaphragm according to the present application;

[0023] Figure 3 is a schematic structural diagram of the insulating sleeve in another perspective in a device for testing the surface resistance of a diaphragm according to the present application.

[0024] Reference numerals in the figure:

[0025] 10. Base; 20. Insulating sleeve; 20a. First cavity; 20b. Second cavity; 20c. Inlet channel; 20d. Outlet channel; 20e. Second liquid storage channel; 20f. First liquid storage channel; 30. Cushion sleeve; 40. Lower electrode assembly; 40a. Lower electrode plate; 50. Upper electrode assembly; 51. Lower electrode plate; 52. Movable frame; 521. Frame body; 522. Insulating rod; 60. Transmission screw; 70. Liquid circulation system; 80. Inlet pipe; 90. Outlet pipe; 100. First cutting edge; 200. Diaphragm. Detailed Embodiments

[0026] For a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientation or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the accompanying drawings and are constructed and operated in a specific orientation. This is only for the convenience of describing the technical solution and does not indicate that the indicated device or element must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0027] The following will further describe in detail the specific embodiments of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model but are not intended to limit the scope of the present utility model.

[0028] Please refer to Figures 1 to 3 , an embodiment of the present application provides a diaphragm 200 surface resistance testing device, including a base 10, an insulating sleeve 20, a lower electrode assembly 40, and an upper electrode assembly 50.

[0029] Specifically, the insulating sleeve 20 is fixed on the surface of the base 10. A first cavity 20a and a second cavity 20b that are connected and communicated are defined inside the insulating sleeve 20. The first cavity 20a is located below the second cavity 20b. One side of the insulating sleeve 20 is provided with a liquid inlet channel 20c and a liquid outlet channel 20d that are communicated with the second cavity 20b and extend along a first direction. And a gasket sleeve 30 is provided at one end of the insulating sleeve 20 away from the base 10. The gasket sleeve 30 is provided with an inner cavity that is communicated with the second cavity 20b, and a first cutting edge 100 is provided along the outer edge of the inner cavity at the top of the gasket sleeve 30. The lower electrode assembly 40 includes a lower electrode plate 40a, and the lower electrode plate 40a is disposed in the first cavity 20a. The upper electrode assembly 50 includes a movable frame 52 and an upper electrode plate 51. The upper electrode plate 51 is fixed on the movable frame 52 and faces the lower electrode plate 40a. And a second cutting edge is provided at one end of the upper electrode plate 51 facing the lower electrode plate 40a. The movable frame 52 can approach or move away from the lower electrode plate 40a along a second direction; wherein, the second direction is perpendicular to the first direction. Both the lower electrode plate 40a and the upper electrode plate 51 are electrically connected to a resistance tester.

[0030] Exemplarily, the above-mentioned "first direction" may refer to the radial direction of the insulating sleeve 20, and specifically, reference can be made to Figure 1 the X direction in.

[0031] Exemplarily, since the base 10 will be subjected to a certain force during the process of the movable frame 52 driving the lower electrode to cut the diaphragm 200 on the gasket sleeve 30, in order to ensure that the base 10 has sufficient stability and compressive resistance, the base 10 in this embodiment is made of a metal material.

[0032] Exemplarily, since an alkaline liquid is used when testing the separator 200, in order to avoid corrosion of the insulating sleeve 20 by the alkaline liquid, the insulating sleeve 20 in this embodiment needs to be made of a corrosion-resistant material, and specifically, it can be made of a polytetrafluoroethylene material, but is not limited thereto.

[0033] It should be noted that the surface resistance of the separator 200 is tested by the AC impedance method to measure the AC impedance of the electrolyte between the upper electrode plate 51 and the lower electrode plate 40a under a constant pressure. Among them, the AC impedance method is a commonly used method for measuring the surface resistance of thin films in the prior art. As is well known to those skilled in the art, the AC impedance method uses a small-amplitude AC signal to perturb the system and observes the influence of the system's response to the perturbation at the steady state. Generally, a small-amplitude AC (usually a sine wave) voltage signal is applied to the electrode to perturb the electrode potential slightly near the equilibrium electrode potential. After reaching the steady state, the amplitude or phase of the response current signal is measured, and the complex impedance of the electrode is calculated in turn. Then, according to the equivalent circuit, through the analysis of the impedance spectrum and parameter fitting, the kinetic parameters of the electrode reaction are obtained.

[0034] Based on the above test method of the AC impedance method, it is necessary to ensure that the upper electrode plate 51 and the lower electrode plate 40a have good electrical conductivity. At the same time, it is also necessary to avoid the corrosion reaction between the upper electrode plate 51 and the lower electrode plate 40a and the alkaline liquid during the test, so as to cause loss of the upper electrode plate 51 and the lower electrode plate 40a. The upper electrode plate 51 and the lower electrode plate 40a need to be made of a corrosion-resistant metal material, and specifically, platinum or silver can be selected.

[0035] Exemplarily, when testing the surface resistance of the separator 200, it is necessary to cut a suitable sample of the separator 200 for soaking pretreatment. In this embodiment, by driving the movable frame 52 to move towards the base 10, the upper electrode plate 51 is driven to move, so that the upper electrode plate 51 presses the separator 200 placed on the cushion sleeve 30. As the movable frame 52 continues to move, the second cutting edge of the upper electrode plate 51 cooperates with the first cutting edge 100 at the top of the cushion sleeve 30 to cut the sample of the separator 200. Compared with the traditional manual cutting method, the operation is more convenient, the error can be effectively reduced, and the test efficiency is improved. In addition, it should be noted that the driving of the movable frame 52 can adopt the driving method in the prior art, and no limitation is made thereto.

[0036] In addition, in order to ensure a reasonable blanking gap and a flat cross section, the gap between the first cutting edge 100 and the second cutting edge needs to satisfy δ = 5% * T, where T is the sample thickness and δ ≥ 0.01.

[0037] The surface resistance testing device for the diaphragm 200 based on the above technical features defines a first cavity 20a and a second cavity 20b that communicate with each other inside the insulating sleeve 20, and a liquid inlet channel 20c and a liquid outlet channel 20d that communicate with the second cavity 20b are arranged on one side of the insulating sleeve 20, so that the liquid required for testing can be injected into the insulating sleeve 20. During testing, the diaphragm 200 is placed on the top of the cushion sleeve 30, and then the movable frame 52 is driven to move, so as to drive the upper electrode plate 51 to press down on the diaphragm 200. As the movable frame 52 continuously moves, the second cutting edge of the upper electrode plate 51 cooperates with the first cutting edge 100 on the top of the cushion sleeve 30 to cut the sample of the diaphragm 200, so that the cut sample falls into the second cavity 20b for immersion pretreatment. After the sample immersion treatment is completed, the upper electrode plate 51 continues to press down, so that the diaphragm 200 sample is clamped between the upper electrode plate 51 and the lower electrode plate 40a. Until the pressure received by the diaphragm 200 sample reaches the clamping force simulating the actual environment, the upper electrode plate 51 stops pressing down. Finally, the AC impedance of the electrolyte between the upper electrode plate 51 and the lower electrode plate 40a under a constant pressure is measured, so as to obtain the surface resistance of the diaphragm 200. The operation is simple, automatic blanking can be realized, manual pre-cutting is not required, test errors can be reduced. At the same time, the inside of the insulating sleeve is designed as a first cavity and a second cavity that communicate with each other, which can realize the integration of pretreatment and zero-spacing testing of the diaphragm to be tested, and can further improve the test accuracy and test efficiency.

[0038] In one embodiment, a plurality of first liquid storage channels 20f extending in the second direction are annularly distributed on the inner wall of the second cavity 20b. A second liquid storage channel 20e arranged in a ring is defined between the first liquid storage channel 20f and the first cavity 20a, and the second liquid storage channel 20e communicates with the first liquid storage channel 20f.

[0039] Exemplarily, when the upper electrode plate 51 extends into the second cavity 20b, the liquid injected into the second cavity 20b is subjected to a squeezing force and flows upward, even causing some liquid in the second cavity 20b to flow out, resulting in unnecessary waste. For this reason, in the embodiment of the present application, a plurality of first liquid storage channels 20f are annularly distributed on the inner wall of the second cavity 20b, so that after the upper electrode plate 51 falls into the second cavity 20b, the liquid will flow along the first liquid storage channels 20f to ensure that after the upper electrode plate 51 presses down, the liquid can fill the entire second cavity 20b, can better infiltrate the diaphragm 200, and can also effectively prevent some liquid from flowing out of the second cavity 20b.

[0040] In one embodiment, the liquid inlet channel 20c is opened at 1 / 3 of the distance from the top of the first liquid storage channel 20f. In this way, the liquid entering from the liquid inlet channel 20c can first fill the second liquid storage channel 20e and then flow into the first liquid storage channel 20f.

[0041] In one embodiment, the movable frame 52 includes a frame body 521 and an insulating rod 522 arranged along the second direction. The frame body 521 is movably arranged above the base 10. One end of the insulating rod 522 is connected to the frame body 521, and the upper electrode plate 51 is fixed to the other end of the insulating rod 522.

[0042] Exemplarily, the insulating rod 522 is fixed in the middle of the frame body 521, and the insulating rod 522 and the frame body 521 can be integrally formed as a whole to improve the overall strength of the movable frame 52. In addition, the driving method for the up and down movement of the frame body 521 can adopt the specific structure of the following embodiments or the driving method in the prior art, which is not limited herein.

[0043] Specifically, it further includes a transmission screw rod 60 on the same side as the insulating sleeve 20. One end of the transmission screw rod 60 is connected to the surface of the base 10, and the other end of the transmission screw rod 60 extends along the second direction. The frame body 521 is threadedly connected to the transmission screw rod 60. Wherein, when the transmission screw rod 60 rotates, the frame body 521 can move up and down along the transmission screw rod 60.

[0044] In this embodiment, since the frame body 521 is threadedly connected to the transmission screw rod 60, when the transmission screw rod 60 rotates, the frame body 521 will be driven to move up and down along the transmission screw rod 60, so as to drive the upper electrode plate 51 fixed on the insulating rod 522 to move up and down, realizing the automatic cutting and pressing of the diaphragm 200. The structure is simple and the operation is convenient. In addition, it should be noted that the transmission screw rod 60 can be rotated manually or driven by a power component (such as a motor), which is not limited herein.

[0045] In one embodiment, the thickness of the lower electrode plate 40a is equal to or greater than the depth of the first cavity 20a.

[0046] In one embodiment, it further includes a liquid circulation system 70. The liquid circulation system 70 is respectively connected to the liquid inlet channel 20c and the liquid outlet channel 20d through a liquid inlet pipe 80 and a liquid outlet pipe 90. In this way, the liquid inlet pipe 80 and the liquid outlet pipe 90 can be respectively connected to the liquid inlet channel 20c and the liquid outlet channel 20d, so that the liquid can circulate and flow in the second cavity 20b, ensuring that the liquid can be tested under certain temperature conditions and reducing the influence of temperature on the test results.

[0047] In one embodiment, a perforation extending along the second direction is formed on the insulating sleeve 20. The perforation is communicated with the first cavity 20a, so that the wire can extend into the first cavity 20a through the perforation and be connected to the lower electrode plate 40a. In this way, one end of the wire can extend into the first cavity 20a through the perforation and be connected to the lower electrode plate 40a.

[0048] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present utility model.

Claims

1. A diaphragm surface resistance testing device, characterized in that, Comprising: Base; Insulating sleeve, which is fixed on the surface of the base. The interior of the insulating sleeve defines a first cavity and a second cavity that communicate with each other. The first cavity is located below the second cavity. One side of the insulating sleeve is provided with a liquid inlet channel and a liquid outlet channel that communicate with the second cavity and extend in a first direction. And one end of the insulating sleeve away from the base is provided with a cushion sleeve. The cushion sleeve is provided with an inner cavity that communicates with the second cavity, and a first cutting edge is provided along the outer edge of the inner cavity at the top of the cushion sleeve; Lower electrode assembly, which includes a lower electrode plate disposed in the first cavity; Upper electrode assembly, which includes a movable frame and an upper electrode plate. The upper electrode plate is fixed on the movable frame and faces the lower electrode plate. And a second cutting edge is provided at one end of the upper electrode plate facing the lower electrode plate. The movable frame can approach or move away from the lower electrode plate along a second direction; wherein, the second direction is perpendicular to the first direction; Both the lower electrode plate and the upper electrode plate are electrically connected to a resistance tester.

2. The diaphragm surface resistance testing device according to claim 1, wherein A plurality of first liquid storage channels extending in the second direction are annularly distributed on the inner wall of the second cavity. A second liquid storage channel arranged in an annular shape is defined between the first liquid storage channel and the first cavity, and the second liquid storage channel communicates with the first liquid storage channel.

3. The diaphragm surface resistance testing device according to claim 2, wherein The liquid inlet channel is opened at 1 / 3 of the distance from the top of the first liquid storage channel.

4. The diaphragm surface resistance testing device according to claim 1, characterized in that The movable frame includes a frame body and an insulating rod arranged along the second direction. The frame body is movably disposed above the base. One end of the insulating rod is connected to the frame body, and the upper electrode plate is fixed at the other end of the insulating rod.

5. The diaphragm surface resistance testing device according to claim 4, wherein It further includes a transmission screw rod on the same side as the insulating sleeve. One end of the transmission screw rod is connected to the surface of the base, and the other end of the transmission screw rod extends in the second direction. The frame body is threadedly connected to the transmission screw rod; Wherein, when the transmission screw rod rotates, the frame body can move up and down along the transmission screw rod.

6. The diaphragm surface resistance testing device according to claim 1, wherein, The thickness of the lower electrode plate is equal to or greater than the depth of the first cavity.

7. The diaphragm surface resistance testing device according to claim 1, wherein It further includes a liquid circulation system, and the liquid circulation system is respectively connected to the liquid inlet channel and the liquid outlet channel through a liquid inlet pipe and a liquid outlet pipe.

8. The diaphragm surface resistance testing device according to claim 1, wherein, A through hole extending in the second direction is opened on the insulating sleeve, and the through hole communicates with the first cavity, so that a wire can extend into the first cavity through the through hole to be connected to the lower electrode plate.

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