Electrolysis water test fixture and assembly method thereof

Abstract

This application discloses an electrolytic water testing fixture and its assembly method. The electrolytic water testing fixture includes an end plate and a cover plate. The end plate includes a working surface for electrolytic water, and a sealing groove and a flow channel are provided on the working surface. The sealing groove is connected end to end and forms a ring, surrounding the outer periphery of the flow channel. A sealing line is embedded in the sealing groove. The cover plate has a cavity for accommodating the end plate and an opening leading to the cavity. The end plate is nested in the cavity, and the working surface of the end plate is exposed to the outside through the opening. There are two end plates and cover plates, which are arranged in parallel with their working surfaces facing each other. By embedding the end plate into the cavity of the cover plate, current can be effectively isolated and heat conduction can be reduced, thereby ensuring that the testing fixture can react stably at the set temperature and improving the accuracy of the test data. Compared with the traditional surface sealing structure, the line contact sealing method achieved by the sealing line reduces the required locking force and the pressure required for assembling the fixture.

Description

Technical Field

[0001] This application relates to the field of water electrolysis technology, specifically to a water electrolysis test fixture and its assembly method. Background Technology

[0002] Anion exchange membrane (AEM) water electrolysis for hydrogen production is an emerging hydrogen production technology. During its development, to test the performance of components such as the membrane, catalyst, and gas diffusion layer, preliminary testing and verification using small-area test fixtures are typically conducted in the laboratory stage before integrating them into a large-area fuel cell stack for testing. Existing test fixtures cannot accurately control the contact pressure of components within the fixture and pose risks such as liquid and gas leakage, especially during high-pressure testing. Some test fixtures, designed to accommodate high-pressure testing, have numerous components, resulting in high cost, difficult assembly, and incompatibility between low-pressure and high-pressure fixtures. Furthermore, the contact pressure of the membrane electrodes after assembly cannot be accurately confirmed during fixture assembly. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes an electrolysis water test fixture and assembly method, which can achieve sealing of the fixture with a smaller locking force and has more accurate testing precision.

[0004] An electrolytic water testing fixture according to one embodiment of this application includes: an end plate, the end plate having a working surface for electrolytic water, a sealing groove and a flow channel provided on the working surface, the sealing groove being connected end to end and forming an annular shape, the sealing groove surrounding the outer periphery of the flow channel, and a sealing line embedded in the sealing groove; a cover plate, the cover plate having a cavity for accommodating the end plate and an opening leading to the cavity, the end plate being nested in the cavity, and the working surface of the end plate being exposed to the outside through the opening; wherein, two end plates and a cover plate are provided, the two end plates being arranged in parallel and the working surfaces facing each other.

[0005] According to one embodiment of this application, the end plate has multiple bolt holes on its working surface. The bolt holes are evenly distributed along the outer periphery of the sealing groove. The bolt holes are used to allow fasteners to pass through to connect the two end plates and apply a locking force to them.

[0006] According to one embodiment of this application, the sealing line is formed in the sealing groove by a dispensing process.

[0007] According to one aspect of the embodiment of this application, the sealing line is made of polyolefin, the dimension H1 of the sealing line in the depth direction of the sealing groove is greater than the depth H2 of the sealing groove, and the relationship between H1 and H2 satisfies 0.3≤(H1-H2) / H1≤0.6; the relationship between the volume V1 of the sealing line and the volume V2 of the sealing groove satisfies 0.6≤(V1-V2) / V1≤0.9.

[0008] According to one aspect of the embodiment of this application, the sealing line is made of rubber, and the dimension H1 of the sealing line in the depth direction of the sealing groove is greater than the depth H2 of the sealing groove, and H1 and H2 satisfy 0.25≤(H1-H2) / H1≤0.3; the volume V1 of the sealing line and the volume V2 of the sealing groove satisfy 0.88≤(V1-V2) / V1≤0.9.

[0009] According to one embodiment of this application, the sealing groove is provided in multiple layers, and the multiple sealing grooves are parallel to each other and distributed in a concentric ring around the flow channel.

[0010] According to one embodiment of this application, a heating plate is included, which is disposed on the side of the end plate away from the working surface. The heating plate is used to heat the end plate to maintain the temperature stability of the working surface.

[0011] An assembly method for an electrolyzed water test fixture according to another embodiment of this application, used for assembling the above-mentioned electrolyzed water test fixture, includes the following steps: placing one end plate with its working surface facing upward; placing the membrane electrode assembly on the flow channel of the working surface; placing the other end plate with its working surface facing downward and fitting it against the working surface of the lower end plate, so that the sealing lines of the two end plates are aligned; fitting a cover plate over the outside of the end plates; and passing fasteners through bolt holes on the two end plates and locking them.

[0012] According to another embodiment of this application, before the cover plate is fitted over the end plate, the heating plate is installed on the side of the end plate away from the working surface.

[0013] According to another embodiment of this application, the working surface includes a flow channel area enclosed by a sealing line and an inactive area surrounding the sealing line, the area of ​​which is S; when the fastener locks the end plate, the fastener generates a fastening force F1, the membrane electrode assembly generates a reaction force F2 due to the pressure of the end plate, the sealing line generates a sealing force F3, and the inactive area generates a pressure F4, wherein F1≥F2+F3, F4=F1-F2-F3; when the water electrolysis test fixture is used for atmospheric pressure testing, F4 / S≥0.1MPa; when the water electrolysis test fixture is used for testing under high pressure P, F4 / S≥P.

[0014] The electrolytic water test fixture according to the embodiments of this application has at least the following beneficial effects: by embedding the end plate into the cavity of the cover plate, the current can be effectively isolated and the heat conduction can be reduced, thereby ensuring that the test fixture can react stably at the set temperature and improving the accuracy of the test data; the sealing form of line contact achieved by the sealing line significantly reduces the required locking force compared with the traditional surface sealing structure, effectively reducing the pressure required for assembling the fixture.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the end plate of the water electrolysis test fixture of this application; Figure 2 for Figure 1 Another perspective view of the end plate of the water electrolysis test fixture; Figure 3 for Figure 1 A schematic diagram of the working surface of the middle plate; Figure 4 This is a schematic diagram of the cover plate of the electrolysis water test fixture of this application; Figure 5 This is a schematic diagram of the electrolysis water testing fixture of this application; Figure 6 for Figure 5 A schematic diagram of the water electrolysis test fixture from another perspective; Figure 7 for Figure 5 A top view of the water electrolysis test fixture; Figure 8 for Figure 7 A cross-sectional view of the water electrolysis test fixture obtained by the AA section line.

[0017] Figure label: 100. End plate; 110. Working surface; 111. Flow channel; 112. Sealing groove; 113. Bolt hole; 114. Electrical terminal; 115. Active area; 116. Inactive area; 120. Temperature measuring hole; 130. Interface; 200. Cover plate; 210. First through hole; 220. Second through hole; 230. Third through hole; 240. First electrical groove; 250. Cavity; 260. Second electrical groove; 300. Heating plate. Detailed Implementation

[0018] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0019] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0022] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] This application provides an electrolysis water test fixture and assembly method, which can achieve the sealing of the fixture with a smaller locking force and has more accurate test precision.

[0024] Please see Figure 5 and Figure 6 This application discloses an electrolysis water testing fixture, which includes an end plate 100 and a cover plate 200. The end plate 100 is embedded in the cover plate 200 to form an integral unit, serving as one end of the electrolysis water testing fixture. The other end is composed of the end plate 100 and the cover plate 200 with the same structure. Specifically, as shown... Figure 1 and Figure 4 As shown, the cover plate 200 is provided with a cavity 250 for accommodating the end plate 100 and an opening leading to the cavity 250. The size of the cavity 250 corresponds to the size of the end plate 100, and the end plate 100 is embedded in the cavity 250 through the opening.

[0025] Understandably, the cover plate 200 is made of a high-temperature resistant plastic material with excellent insulation properties. This effectively isolates current and reduces heat conduction, thereby ensuring that the test fixture can react stably at the set temperature and improving the accuracy of the test data. Specifically, the material used to make the cover plate 200 has a glass transition temperature greater than 150°C. This plastic material can be POM, PPS, PSU, PEEK, or nylon, etc. Preferably, the cover plate 200 is made of PSU or PEEK, which also possesses high structural strength.

[0026] like Figure 1 and Figure 2 As shown, the end plate 100 includes a working surface 110, on which a sealing groove 112 and a flow channel 111 for the flow of reactants and products of water electrolysis are provided. The sealing groove 112 is formed into a ring structure with its ends connected, and the sealing groove 112 is arranged around the flow channel 111. A sealing line is embedded in the sealing groove 112. When the end plates 100 at both ends of the water electrolysis test fixture approach each other to clamp the membrane electrode assembly, the sealing lines on the two end plates 100 gradually contact and clamp, ensuring that the flow channel 111 is isolated within the area enclosed by the sealing groove 112. The end plate 100 also includes an interface 130 and a power terminal 114. The interface 130 is located on the side of the end plate 100 and is connected to the flow channel 111 to realize the entry of reactants and the exit of products. Each end plate 100 has two interfaces 130 to realize the independent introduction and exit of multiple reactants or products. The power terminal 114 is also located on the side of the end plate 100, which can provide a stable current input to the end plate 100 and ensure that the electrolysis reaction proceeds stably.

[0027] Furthermore, the water electrolysis test fixture has multiple interface 130 connection methods during operation; please refer to [link / reference needed]. Figure 5 Taking the end plate 100 located at the lower end of the test fixture as the cathode for water electrolysis and the end plate 100 located at the upper end of the test fixture as the anode for water electrolysis as an example, the connection methods of the interface 130 include three types: liquid inlet for both cathode and anode, liquid inlet for anode only, and liquid inlet for cathode only. These are explained in detail below: When an electrolysis method in which both the cathode and anode are used for liquid inlet is adopted, the two interfaces 130 of the end plate 100 as the anode and the end plate 100 as the cathode are respectively configured as an inlet and an outlet. The inlets of the cathode and anode are used to flow into the KOH solution. The oxygen generated by the electrolysis reaction is discharged from the outlet on the anode side along with the KOH solution, and the hydrogen generated by the electrolysis reaction is discharged from the outlet on the cathode side along with the KOH solution. When an electrolysis method with the anode side used for liquid inlet is adopted, the two interfaces 130 of the end plate 100 serving as the anode are respectively configured as an inlet and an outlet. The inlet on the anode side is used to introduce KOH solution, and the oxygen generated by the electrolysis reaction is discharged from the outlet on the anode side along with the KOH solution. Both interfaces 130 on the cathode side are used to discharge hydrogen gas. When an electrolysis method with only one side of the cathode used for liquid inlet is adopted, the two interfaces 130 of the end plate 100 serving as the cathode are respectively configured as an inlet and an outlet. The cathode-side inlet is used to introduce KOH solution, and the hydrogen gas generated by the electrolysis reaction is discharged from the cathode-side outlet along with the KOH solution. Both interfaces 130 on the anode side are used to discharge oxygen.

[0028] like Figure 1 and Figure 3 As shown, the area enclosed by the sealing groove 112 is the active area 115 of the working surface 110, and the area around the sealing groove 112 on the working surface 110 is formed as the inactive area 116. The active area 115 is the area where the water electrolysis reaction takes place and where the water electrolysis reaction is isolated. The inactive area 116 is not involved in the water electrolysis reaction. Multiple bolt holes 113 are provided on the inactive area 116. The bolt holes 113 are evenly distributed along the outer periphery of the sealing groove 112. The bolt holes 113 can cooperate with fasteners to pass through the two end plates 100 to connect the test fixture and apply a locking force to them. The locking force acts on the test fixture, and the sealing line between the two end plates 100 contacts each other and deforms, thereby achieving the sealing of the flow channel 111 and the membrane electrode assembly.

[0029] Understandably, the sealing method that achieves line contact through a sealing line significantly reduces the required locking force compared to the traditional surface sealing structure, effectively reducing the pressure required by the assembly fixture.

[0030] like Figure 4 and Figure 5 As shown, in the cooperation of the cover plate 200 and the end plate 100, the working surface 110 of the end plate 100 embedded in the cover plate 200 is exposed through the opening. The end plates 100 located at both ends of the water electrolysis test fixture are arranged in parallel and their working surfaces 110 face each other. Corresponding to the bolt holes 113 of the end plate 100, the cover plate 200 is provided with a first through hole 210 to allow fasteners to pass through and engage with the bolt holes 113 on the end plate 100, so as to realize the assembly and disassembly of the fixture. Corresponding to the interface 130 of the end plate 100, the cover plate 200 is provided with a third through hole 230 for docking with the interface 130 to ensure unobstructed flow paths for reactants and products. Corresponding to the electrical terminal 114 of the end plate 100, the cover plate 200 is provided with a first electrical groove 240 for exposing the electrical terminal 114. The electrical terminal 114 leads to the outside of the test fixture through the first electrical groove 240 and can be connected to an external power source.

[0031] In some embodiments, such as Figure 1As shown, the end plate 100 also includes a temperature measuring hole 120, which is located on the side of the end plate 100 adjacent to the working surface 110. The temperature measuring hole 120 is connected to the active area 115 inside the end plate 100 and is used to monitor the temperature change during the electrolysis reaction in real time. Correspondingly, the cover plate 200 is provided with a second through hole 220, which is aligned with the temperature measuring hole 120. Specifically, the tester can insert a thermocouple into the temperature measuring hole 120 through the second through hole 220 to obtain the real-time temperature of the active area 115. It can be understood that the tester can control the reaction temperature through the combined action of the thermocouple and the heating plate 300. In this embodiment, the reaction temperature of the fixture can be controlled within ±1℃ of the set temperature. Unlike the heat exchange state where the end plate 100 is directly convectioned with the air in the prior art, this application improves the test fixture to an adiabatic state through the combined action of the cover plate 200 and the heating plate 300, thereby improving the consistency of temperature control.

[0032] In some embodiments, the sealing line is formed within the sealing groove 112 by an adhesive dispensing process. Specifically, the sealing line can be made of materials such as rubber, PTFE, and polyolefin. This application uses polyolefin and rubber as examples to illustrate the dimensional relationship between the sealing line and the sealing groove 112: When the sealing line is made of polyolefin, the dimension H1 of the sealing line in the depth direction of the sealing groove 112 is greater than the depth H2 of the sealing groove 112, and the relationship between H1 and H2 satisfies 0.3≤(H1-H2) / H1≤0.6; the relationship between the volume V1 of the sealing line and the volume V2 of the sealing groove 112 satisfies 0.6≤(V1-V2) / V1≤0.9. When the sealing line is made of rubber, the dimension H1 of the sealing line in the depth direction of the sealing groove 112 is greater than the depth H2 of the sealing groove 112, and the relationship between H1 and H2 satisfies 0.25≤(H1-H2) / H1≤0.3; the relationship between the volume V1 of the sealing line and the volume V2 of the sealing groove 112 satisfies 0.88≤(V1-V1) / V1≤0.9.

[0033] In some embodiments, such as Figure 1 The sealing groove 112 shown has three channels, which are parallel to each other and concentrically distributed around the flow channel 111. These multiple sealing lines work together to seal the flow channel 111 of the active area 115, improving the sealing effect and increasing the tolerance of the test fixture. It is understood that the number of sealing grooves 112 can also be set according to actual sealing requirements.

[0034] In some embodiments, such as Figure 7 and 8As shown, the water electrolysis test fixture also includes a heating plate 300. The heating plate 300 is disposed on the side of the end plate 100 away from the working surface 110. The end plate 100 is provided with a mounting groove on this side for accommodating the heating plate 300. The heating plate 300 is embedded in the mounting groove of the end plate 100. The end plate 100 is embedded in the cover plate 200. The heating plate 300 is surrounded by the cover plate 200 and the end plate 100 to form a sealed space, ensuring that the heat can be concentrated on the end plate 100 and transferred to the working surface 110 of the end plate 100 during the heating process, maintaining the temperature stability of the working surface 110, and ensuring the testing accuracy of the water electrolysis test fixture.

[0035] Furthermore, please combine Figure 4 , Figure 6 and Figure 8 It is understood that a second electrical connection groove 260 is provided on the cover plate 200. The second electrical connection groove 260 is used to expose the electrical connection point of the heating plate 300. The electrical connection point of the heating plate 300 is led out through the second electrical connection groove 260 and connected to an external power source. The second electrical connection groove 260 and the first electrical connection groove 240 are respectively provided on opposite sides of the cover plate 200 to avoid mutual interference between the electrolysis current and the heating current.

[0036] This application also discloses an assembly method for an electrolytic water test fixture, used to assemble the aforementioned electrolytic water test fixture, specifically including the following steps: One end plate 100 is used as the cathode of the water electrolysis reaction and its working surface 110 is placed facing upwards; The membrane electrode assembly is placed on the flow channel 111 of the working surface 110 of the cathode end plate 100; The other end plate 100 is used as the anode of the water electrolysis reaction and its working surface 110 is placed downward and attached to the working surface 110 of the cathode end plate 100; Align the sealing lines of the two end plates 100; The cover plate 200 is fitted onto the outside of the end plate 100; Pass the fasteners through the bolt holes 113 on the two end plates 100 and tighten them.

[0037] Of the two end plates 100 mentioned above, the lower end plate 100 is the female end plate 100, and the upper end plate 100 is the male end plate 100. It can be understood that the lower end plate 100 can be the male end plate 100, and the upper end plate 100 can be the female end plate 100. The order of the two can be changed according to actual assembly requirements.

[0038] The membrane electrode assembly includes a cathode PTFE gasket, a cathode diffusion layer, an anion exchange membrane, an anode diffusion layer, and an anode PTFE gasket, which are stacked sequentially from the cathode end plate 100 to the anode end plate 100. Both the cathode and anode PTFE gaskets are used to seal the test fixture. On the anode side, an anode catalyst layer is disposed at the interface between the anode diffusion layer and the anion exchange membrane, where an oxygen evolution reaction occurs, producing oxygen. The oxygen is collected and discharged from the flow channel 111 of the end plate 100, which serves as the anode. On the cathode side, a cathode catalyst layer is disposed at the interface between the cathode diffusion layer and the anion exchange membrane, where a hydrogen evolution reaction occurs, producing hydrogen. The hydrogen is collected and discharged from the flow channel 111 of the end plate 100, which serves as the cathode, through the porous diffusion layer. The functions of the cathode and anode diffusion layers are to diffuse and transfer reactants, conduct electricity, support the anion exchange membrane, and act as catalyst layers.

[0039] like Figure 5 As shown, when another end plate 100 is placed on the end plate 100, which is the cathode, as the anode of the water electrolysis reaction, the terminal 114 of the end plate 100, which is the anode, and the terminal 114 of the end plate 100, which is the cathode, are aligned to facilitate the connection of the external DC power supply to the test fixture and its placement.

[0040] Before fitting the cover plate 200 onto the outside of the end plate 100, such as Figure 8 As shown, the heating plate 300 is installed on the side of the end plate 100 away from the working surface 110. In this way, the end plate 100 is embedded in the cover plate 200, and the heating plate 300 is surrounded by the cover plate 200 and the end plate 100 to form a sealed space. This ensures that the heat can be concentrated on the end plate 100 and transferred to the working surface 110 of the end plate 100 during the heating process, maintaining the temperature stability of the working surface 110 and ensuring the testing accuracy of the water electrolysis test fixture.

[0041] The fasteners described above are bolts, which pass through bolt holes 113 on the two end plates 100 and are locked in place. The fasteners generate a tightening force F1. The membrane electrode assembly is compressed by the end plates 100, generating a reaction force F2. The sealing line requires a sealing force F3, and the inactive area 116 surrounding the sealing line generates pressure F4. The area of ​​the inactive area 116 is S. The reaction force F2 generated by the compression of the membrane electrode assembly by the end plates 100 is pre-calculated by the tester based on the characteristics of the membrane electrode and assembly requirements. The sealing force F3 required by the sealing line is calculated by the tester based on the material properties and contact width of the sealing line. Based on the calculated values ​​of F2 and F3, the minimum value of the tightening force F1 generated by the fasteners can be calculated according to F1≥F2+F3. The tightening force F1 generated by the fasteners can be quantified using a torque wrench. In addition, F1 also needs to satisfy F4 = F1 - F2 - F3; where the value of F4 needs to meet the requirements of the test conditions. When the performance test is performed under normal pressure, F4 / S ≥ 0.1MPa is required. When the test fixture is used for testing under high pressure of P, F4 / S ≥ P.

[0042] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A water electrolysis testing fixture, characterized in that, include: An end plate, the end plate including a working surface for electrolysis of water, a sealing groove and a flow channel are provided on the working surface, the sealing groove is connected end to end and forms a ring, the sealing groove surrounds the outer periphery of the flow channel, and a sealing line is embedded in the sealing groove; A cover plate having a cavity for accommodating the end plate and an opening leading to the cavity, the end plate being nested within the cavity, and the working surface of the end plate being exposed to the outside through the opening; There are two end plates and two cover plates, which are arranged in parallel and whose working surfaces face each other.

2. The water electrolysis test fixture according to claim 1, characterized in that, The end plate has multiple bolt holes on its working surface. The bolt holes are evenly distributed along the outer periphery of the sealing groove. The bolt holes are used to allow fasteners to pass through to connect the two end plates and apply a locking force to them.

3. The water electrolysis test fixture according to claim 1, characterized in that, The sealing line is formed in the sealing groove by a dispensing process.

4. The water electrolysis test fixture according to claim 1, characterized in that, The sealing line is made of polyolefin. The dimension H1 of the sealing line in the depth direction of the sealing groove is greater than the depth H2 of the sealing groove, and H1 and H2 satisfy 0.3≤(H1-H2) / H1≤0.6; the volume V1 of the sealing line and the volume V2 of the sealing groove satisfy 0.6≤(V1-V2) / V1≤0.

9.

5. The water electrolysis test fixture according to claim 3, characterized in that, The sealing line is made of rubber. The dimension H1 of the sealing line in the depth direction of the sealing groove is greater than the depth H2 of the sealing groove, and H1 and H2 satisfy 0.25≤(H1-H2) / H1≤0.3; the volume V1 of the sealing line and the volume V2 of the sealing groove satisfy 0.88≤(V1-V1) / V1≤0.

9.

6. The water electrolysis test fixture according to claim 1, characterized in that, The sealing groove is provided in multiple layers, and the multiple sealing grooves are parallel to each other and distributed in a concentric ring around the flow channel.

7. The electrolysis water testing fixture according to claim 1, characterized in that, It includes a heating plate disposed on the side of the end plate away from the working surface, and the heating plate is used to heat the end plate to maintain the temperature stability of the working surface.

8. A method for assembling an electrolyzed water testing fixture, used for assembling the electrolyzed water testing fixture according to any one of claims 1-7, characterized in that, Includes the following steps: Place one of the end plates with the working surface facing upwards; Place the membrane electrode assembly on the flow channel of the working surface; Place the working surface of the other end plate downwards and abut it against the working surface of the lower end plate, so that the sealing lines of the two end plates are aligned. The cover plate is fitted over the outside of the end plate; Pass the fastener through the bolt holes on the two end plates and tighten it.

9. The assembly method for the electrolysis water test fixture according to claim 8, characterized in that, Before the cover plate is fitted over the end plate, the heating plate is installed on the side of the end plate away from the working surface.

10. The assembly method of the water electrolysis test fixture according to claim 8, characterized in that, The working surface includes a flow channel area enclosed by the sealing line and an inactive area surrounding the sealing line, the area of ​​which is S; when the fastener locks the end plate, the fastener generates a fastening force F1, the membrane electrode assembly generates a reaction force F2 due to the pressure of the end plate, the sealing line generates a sealing force F3, and the inactive area generates a pressure F4, wherein F1≥F2+F3, F4=F1-F2-F3; When the electrolysis water test fixture is used for atmospheric pressure testing, F4 / S ≥ 0.1 MPa; When the electrolytic water test fixture is used for testing under high pressure P, F4 / S≥P.

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