An assembly method for a water electrolysis hydrogen production electrolyzer

Abstract

The present invention discloses an assembly method for a hydrogen production electrolyzer by water electrolysis, belonging to the technical field of electrolyzers, including: S1, marking marking lines on the side surfaces of the plate bodies of the plate electrode assembly, the bottom end pressing plate and the top end pressing plate; S2, arranging positioning holes on the front surfaces of the plate bodies; S3, installing the bottom end pressing plate on the assembly base, aligning the horizontal marking line with the upper end surface to measure and level the horizontality; S4, inserting positioning rods, stacking the plate electrode assemblies. When the stacking height is close to the set height of the pin holes, insert positioning pins, and continue stacking. During the stacking process, it is necessary to insert and remove the positioning pins for cooperation and use the vertical marking line to align with the marking line to measure and adjust the verticality. After the stacking is completed, place the top end pressing plate to seal the top; S5, insert the pull rods into the pull rod holes, and install pressing pieces and nuts at both ends. The positioning methods of the positioning rods and the marking instrument complement each other, realizing the internal positioning and external alignment of the electrolyzer, completely avoiding problems such as inclination, unevenness and distortion, improving production efficiency and ensuring manufacturing quality.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolyzers, and in particular to an assembly method for a water electrolysis hydrogen production electrolyzer. Background Art

[0002] With the announcement of the carbon peak and carbon neutrality cycles of different countries around the world, the energy revolution has become the unchanging theme for many years to come in China and even the world. Hydrogen energy is a secondary energy source with rich sources, green and low-carbon, and wide applications, and is gradually becoming one of the important carriers for the global energy transformation and development. The technology of alkaline water electrolysis hydrogen production equipment is relatively mature. Compared with other technical route equipment, it has good economy and a relatively large single equipment scale, and can better meet the needs of large-scale energy projects. The electrolyzer is the core component of the water electrolysis hydrogen production equipment. The alkaline hydrogen production electrolyzer is often of a filter press structure. The main body of the electrolyzer is cylindrical and is composed of hundreds of identical or similar plate assemblies and other components. The two ends of the plate assembly are tightly fastened by a combination of end pressing plates and tie rods. A single electrolysis cell is formed by sandwiching a diaphragm cloth and a gasket between every two plates. The number of electrolysis cells required for large electrolyzer equipment reaches or even exceeds 400.

[0003] In view of the structure and material characteristics of the electrolyzer, the electrolyzer has been assembled in a vertical state in the industry for many years, that is, each part is stacked and installed in a horizontal state. After the installation is completed, the electrolyzer is lifted and flipped 90° to become a horizontal state for delivery and use. When the electrolyzer is erected and stacked for installation, the stacking height is generally nearly 5 meters or even far exceeds 5 meters. The thickness of each plate, gasket and other materials is relatively thin. The number of plate assemblies, gaskets and other materials required for the installation of the electrolyzer can reach 400 or more. In the production and manufacturing of stacking multiple components, situations such as uneven stacking, inclination, and stacking distortion of the electrolyzer often occur. Unevenness affects the appearance of the electrolyzer and the alignment of internal channels. Inclination will bring safety hazards and affect the assembly result. Distortion will cause the internal installation holes of the electrolyzer plate assembly and gasket not to align, affecting the installation of the end pressing plates at both ends. At present, the installation and manufacturing of electrolyzers in the industry are mostly carried out by experienced employees. When it is uneven or inclined, it is corrected again by measures such as hammering. When the stacking distortion is large, it is removed and reworked and reassembled. Each electrolyzer installation will be corrected multiple times. This manufacturing situation in the industry has continued for many years. On the one hand, it will affect the production efficiency of electrolyzer manufacturing, and on the other hand, it is difficult to ensure the quality consistency of batch manufacturing of electrolyzers to a certain extent. Summary of the Invention

[0004] The object of the present invention is to solve the above technical problems and provide an assembly method for a water electrolysis hydrogen production electrolyzer. The positioning rod and the alignment instrument positioning method are combined with each other and complement each other, realizing the internal positioning and external alignment of the electrolyzer. The method is complete and effective, and the best effect can be achieved when both are implemented, so as to completely avoid problems such as inclination, unevenness or distortion when more electrolyzers are stacked, improve the manufacturing production efficiency of the electrolyzer, and ensure the quality consistency of batch manufacturing of the electrolyzer.

[0005] To achieve the above object, the present invention provides the following solutions: The present invention discloses an assembly method for a water electrolysis hydrogen production electrolyzer, including the following steps:

[0006] S1. Mark corresponding marking lines on the plate body sides of the plate electrode assembly, the bottom end pressing plate and the top end pressing plate.

[0007] S2. Corresponding at least two positioning holes are provided on the front surfaces of the plate electrode assembly, the bottom end pressing plate and the top end pressing plate, and the positioning holes are arranged at intervals along the same circumference.

[0008] S3. Install the bottom end pressing plate on the assembly base, and measure the level of the upper end surface of the bottom end pressing plate by aligning with the horizontal marking line of the alignment instrument, and level the bottom end pressing plate according to the measurement result.

[0009] S4. Insert a positioning rod into the positioning hole of the bottom end pressing plate. There is a pin hole across the rod body on the positioning rod. Pass the positioning hole of the plate electrode assembly through the corresponding positioning rod for stacking. During the stacking process, at least two of the marking lines on the plate body side are aligned with the vertical marking line of the alignment instrument for verticality measurement, and the plate electrode assembly is adjusted in time during the stacking process according to the measurement result. When the stacking height is close to the set height of the pin hole, insert a positioning pin with a length greater than the diameter of the positioning hole into the pin hole, continue to stack the plate electrode assembly, insert and pull out the positioning pin during the stacking process to cooperate with the stacking of the plate electrode assembly. When pulling out the positioning pin, lift the positioning rod to make the pin hole higher than the newly stacked plate electrode assembly. After the stacking is completed, place the top end pressing plate for capping.

[0010] S5. Insert the pull rod into the pull rod holes of the top end pressing plate and the bottom end pressing plate, sleeved with pressing parts at both ends of the pull rod respectively, and screw in the nuts to press the pressing parts on the plate surfaces of the bottom end pressing plate and the top end pressing plate respectively.

[0011] Preferably, it includes four of the marking lines, and the four marking lines are located on the cross center line of the front of the plate body.

[0012] Preferably, the marking lines are marked by drawing or engraving.

[0013] Preferably, in step S2, taking the cross center line as the quadrant, the positioning holes are provided in at least two different quadrants.

[0014] Preferably, in step S2, one of the positioning holes is provided in each of the four quadrants, and the positioning holes in the four quadrants are connected in sequence to form a rectangular shape.

[0015] Preferably, the line level uses an infrared line level or a laser line level.

[0016] Preferably, a threaded hole is provided at the top end of the positioning rod. In step S3, a auxiliary tool with a threaded head at the preparatory end is prepared. When the positioning rod accidentally falls to the bottom of the stacked plate assemblies, the threaded head is screwed into the threaded hole, and the auxiliary tool is lifted to lift out the positioning rod.

[0017] Preferably, the length of the positioning rod is 400 mm to 1000 mm, and the diameter of the positioning rod is 0.5 mm to 1 mm smaller than the diameter of the positioning hole.

[0018] Preferably, the plate assembly includes plates, separator cloths, gaskets, and separator cloths stacked in sequence from top to bottom.

[0019] The present invention has achieved the following technical effects compared with the prior art:

[0020] In the assembly method of the water electrolysis hydrogen production electrolyzer of the present invention, the positioning rod and the positioning hole are used to achieve the preliminary positioning of the electrolyzer. Functionally, it can ensure the placement position state of each workpiece, restrict the stacked plate assembly within a small offset range, achieve the preliminary positioning effect during stacking, and generally avoid the situations of uneven stacking and twisted stacking of each component. The line level is used to achieve the further positioning of the electrolyzer. Its horizontal line can monitor and adjust the levelness of the bottom end pressing plate, ensuring the levelness of the plate assembly and the top end pressing plate above it, solving the problem of the electrolyzer stacking being inclined. Its vertical line ensures that the electrolyzer has good vertical cylindricity after stacking, ensuring neat stacking. The positioning rod and the line level are combined with each other and complement each other, and can realize the internal positioning and external alignment of the electrolyzer. The method is systematic and complete, and the best effect can be achieved only when both are implemented to completely avoid the states of inclination, unevenness or twisting when more electrolyzers are stacked, solving the problems of uneven appearance and internal channels of the electrolyzer caused by unevenness, ensuring the smoothness of the internal flow channels during the stacking of the electrolyzer, and at the same time solving the problems that the internal installation holes of the plate assembly and the gasket cannot be aligned due to twisting and affecting the installation of the end pressing plates at both ends, avoiding the safety hazards and affecting the assembly results caused by inclination. There is no need to correct again when the stacking is inclined, no need to correct again when it is uneven, and no need to disassemble and re-assemble when the stacking is twisted greatly, thereby improving the manufacturing production efficiency of the electrolyzer and ensuring the consistency of the batch manufacturing quality of the electrolyzer. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings;

[0022] Figure 1 It is a front view during the assembly process of a water electrolysis hydrogen production electrolyzer;

[0023] Figure 2 It is a top view during the assembly process of a water electrolysis hydrogen production electrolyzer;

[0024] Figure 3 It is a top view of the electrode plate;

[0025] Figure 4 It is a front view of the electrode plate;

[0026] Figure 5 It is a schematic diagram of the installation and stacking of the electrode plate assembly;

[0027] Figure 6 It is a front view of the water electrolysis hydrogen production electrolyzer after assembly.

[0028] Description of the reference numerals: 1, bottom end pressing plate; 2, electrode plate assembly; 3, top end pressing plate; 4, assembly base; 5, pressing member; 6, nut; 7, positioning hole; 8, pull rod hole; 9, positioning rod; 10, positioning pin; 11, pull rod; 12, cross center line; 13, marking line; 14, first marking instrument; 15, second marking instrument; 16, vertical marking line; 17, electrode plate; 18, diaphragm cloth; 19, sealing gasket. Detailed Embodiments

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] This embodiment provides an assembly method for a water electrolysis hydrogen production electrolyzer, as Figures 1 to 6 shown, including the following steps:

[0031] S1. Mark at least two marking lines 13 on the side surfaces of the plates of the bottom end plate 1, the plate assembly 2, and the top end plate 3. The marking lines 13 on the bottom end plate 1, the plate assembly 2, and the top end plate 3 correspond to each other. That is, during the assembly process of the electrolytic cell, the marking lines 13 of the bottom end plate 1, the plate assembly 2, and the top end plate 3 can be aligned with each other.

[0032] S2. Provide at least two positioning holes 7 on the front surfaces of the plates of the bottom end plate 1, the plate assembly 2, and the top end plate 3. The positioning holes 7 on the bottom end plate 1, the plate assembly 2, and the top end plate 3 should correspond to each other so that a positioning rod 9 can be inserted during installation. All the positioning holes 7 are arranged at equal intervals along the same circumference.

[0033] S3. First, install the bottom end plate 1 on the assembly base 4. Align the upper end surface of the bottom end plate 1 with the horizontal marking line (not shown) of the leveling instrument for level measurement, and level the bottom end plate 1 according to the measurement results. During the level measurement, use measuring tools such as a height gauge or a steel ruler to measure the dimensions between different positions on the upper end surface of the bottom end plate 1 and the horizontal marking line to determine whether the end plate is placed horizontally.

[0034] S4. Insert the positioning rod 9 into the positioning hole 7 of the bottom end plate 1. The positioning rod 9 is provided with a pin hole across the rod body. Align the positioning hole 7 of the first plate assembly 2 with the positioning rod 9 and insert it. Then slowly lower the first plate assembly 2 onto the bottom end plate 1 to complete the placement of the first plate assembly 2. Referring to the placement method of the first plate assembly 2, continuously stack new plate assemblies 2. During the stacking process, the vertical marking line 16 of the above-mentioned leveling instrument should be aligned with the marking line 13 aligned with the horizontal marking line for perpendicularity measurement, and the plate assembly 1 should be adjusted in a timely manner during the stacking process according to the measurement results. The marking lines 13 of the plate assembly 2 and the bottom end plate 1 need to be aligned with each other. When the stacking height of the plate assembly 2 is close to the set height of the pin hole, insert a positioning pin 10 into the pin hole. The length of the positioning pin 10 is greater than the diameter of the positioning hole 7. Continue to stack the plate assembly 2. After stacking a new plate assembly 2, lift the positioning rod 9 upward by a certain distance with your hand or other tools so that the pin hole is higher than the newly stacked plate assembly 2, and insert the positioning pin 10 so that the positioning rod 9 can be stuck on the plate assembly 2 and will not fall off. Then take a new plate assembly 2 and continue to stack following the above process. Finally, after stacking all the plate assemblies 2, stack a top end plate 3 on the topmost plate assembly 2 to cap it.

[0035] S5. Insert the tie rod 11 into the tie rod holes 8 of the top end plate 3 and the bottom end plate 1. Then, respectively put on the pressing parts 5 at both ends of the tie rod 11, and screw in the nuts 6 to press the pressing parts 5 tightly on the plate surfaces of the bottom end plate 1 and the top end plate 2 respectively, thus completing the assembly.

[0036] The plate assembly 2 is mainly composed of a plate 17, a diaphragm cloth 18, and a gasket 19. Refer to Figure 5 As shown, the diaphragm cloth 18 is arranged in the groove of the plate 17, and the gasket 19 is laid above the plate 17. Therefore, positioning holes 7 need to be drilled in both the gasket 19 and the plate 17. During specific stacking, first place a plate 17 with a diaphragm cloth 18, then lay a layer of gasket 19 on the plate 17, then lay another plate 17 with a diaphragm cloth 18 on the gasket 19, and then lay a layer of gasket 19. In this way, in multiple groups of plate assemblies 2, a form is constituted where a gasket 19 is sandwiched between two plates 17.

[0037] Due to the existence of the positioning rod 9, during each stacking, it can ensure that the internal channels between components are aligned, avoiding situations such as uneven stacking and twisted stacking of the electrolytic cell, solving the problems of uneven stacking affecting the appearance of the electrolytic cell and the alignment of internal channels, and the problem that twisting causes the internal mounting holes of the plates 17 and gaskets 19 of the electrolytic cell not to be aligned, affecting the installation of the end head pressing plates at both ends. The horizontal marking line of the marking instrument can solve the problem of inclination during the stacking of the electrolytic cell, and the vertical marking line 16 of the marking instrument ensures that the electrolytic cell has good vertical cylindricity after stacking, ensuring flat and even stacking. When all the above steps are adopted, each step complements each other, and the problems of inclination and twisting during the stacking and installation process of the electrolytic cell can be completely avoided, avoiding the hammering process for correction due to inclination, avoiding damage to the outer surfaces of parts such as the plate assembly due to the hammering process, saving installation and manufacturing time, greatly improving production operation efficiency, effectively ensuring the installation and manufacturing quality of the electrolytic cell, effectively ensuring the consistency of batch manufacturing quality. According to this method, it can be ensured that the unevenness of the tank body after stacking of a large electrolytic cell is not greater than 1 mm, the inclination is not greater than 1 mm, and the twist is not greater than 1 mm, fully meeting the overall manufacturing technical quality requirements of the electrolytic cell. When installing and stacking an electrolytic cell by the conventional method, generally the components such as the plate assembly are uneven, the unevenness of the tank body is generally within 5 - 8 mm, the inclination is about 6 mm, and the arc length of the twist degree can reach 50 mm, completely relying on the experience and responsibility of employees.

[0038] In this embodiment, as Figures 1 to 6 shown, no matter how many marking lines 13 there are on the side wall of the plate body, when two of the marking lines 13 are aligned by the horizontal marking line, the connecting lines of the two aligned marking lines 13 and the center of the front surface of the plate body are not collinear. The purpose of such a setting is to enable the plate body to be better adjusted. Preferably, the connecting lines of the two aligned marking lines 13 and the center of the front surface of the plate body are perpendicular to each other.

[0039] In this embodiment, as Figures 1 to 6As shown in the figure, it includes at least three or more marking lines 13. The positions of the marking lines 13 are located at the endpoints of a regular polygon, and the center of the regular polygon is the center of the front surface of the plate bodies such as the bottom end pressing plate 1, the plate electrode assembly 2, and the top end pressing plate 3 (the regular polygon mentioned here is the positioning reference line when the marking lines 13 are drawn and will not be actually drawn on the plate body). The regular polygon can be an equilateral triangle, a square, a regular pentagon, etc. Among them, only three marking lines 13 can be set, located at the three endpoints of the regular polygon, or more than three can be set, corresponding to multiple endpoints. For example, three marking lines 13 can be set at three endpoints of a square, or all four endpoints can be set with marking lines 13. Or one marking line 13 can be set at each of the three endpoints of an equilateral triangle. It should be noted that when there are multiple marking lines 13, it does not mean that an equal number of marking instruments must be set, but there should be at least two marking instruments.

[0040] Furthermore, in this embodiment, as Figures 1 to 6 shown in the figure, it includes four marking lines 13. The four marking lines 13 are located on the cross center line 12 of the front surface of the plate body (the cross center line 12 in the figure is an explanatory line and is not actually drawn on the plate body). The cross center line 12 method is simpler than the regular polygon positioning method, which is convenient for the positioning of the marking lines 13 and is more suitable for popularization. When only two marking instruments are used, such as the first marking instrument 14 and the second marking instrument 15, at this time, the first marking instrument 14 and the second marking instrument 15 need to be aligned with two adjacent marking lines 13, that is, the horizontal marking lines of the first marking instrument 14 and the second marking instrument 15 are perpendicular to each other. Then, the levelness of the bottom end pressing plate 1 is measured by using the horizontal marking lines of the first marking instrument 14 and the second marking instrument 15, and the bottom end pressing plate 1 is leveled according to the measurement results. During the stacking process, the vertical marking lines 16 of the first marking instrument 14 and the second marking instrument 15 are respectively aligned with the two marking lines 13 aligned by the horizontal marking lines for the overall verticality measurement, and the plate electrode assembly 2 is adjusted in a timely manner according to the measurement results during the stacking process to ensure the overall verticality and the corresponding positions of each layer. When adjusting, it is necessary to pay attention to whether the marking lines 13 of each layer correspond to further adjust the twisting, staggering, and inclination situations. If the positioning rod 9 and the positioning hole 7 cannot completely eliminate the problems of stacking staggering, twisting, and inclination, then on the basis of the positioning rod 9 and the positioning hole 7, combining with the marking instrument can completely eliminate the above problems.

[0041] In addition, three marking instruments can also be used to align with three marking lines 13, that is, in addition to the first marking instrument 14 and the second marking instrument 15, a third marking instrument is set. The third marking instrument is located on the opposite side of the first marking instrument 14 or the second marking instrument 15 to improve the calibration effect. Of course, four marking instruments can also be used to align with four marking lines 13, that is, the fourth marking instrument and the third marking instrument are respectively located on the opposite sides of the first marking instrument 14 and the second marking instrument 15.

[0042] In this embodiment, asFigures 1 to 6 As shown, the marking line 13 is marked by drawing a line or engraving. Drawing a line can be done with a marker or the like. Engraving can be done by manual scribing or mechanical engraving.

[0043] In this embodiment, as Figures 1 to 6 shown, in step S2, taking the cross center line 12 as the quadrant, positioning holes 7 are provided in at least two different quadrants to improve the stability and accuracy of positioning.

[0044] Furthermore, in this embodiment, as Figures 1 to 6 shown, in step S2, one positioning hole 7 is provided in each of the four quadrants.

[0045] In this embodiment, as Figures 1 to 6 shown, the alignment instrument adopts an infrared alignment instrument or a laser alignment instrument.

[0046] During the actual installation process, if some of the positioning holes 7 are stacked neatly, there is a risk that the positioning rod 9 will fall down without measures under clearance fit. Therefore, in this embodiment, as Figures 1 to 6 shown, a threaded hole is provided at the top end of the positioning rod 9. In step S4, a auxiliary tool with a threaded head at the preparatory end is prepared. When the positioning rod 9 accidentally falls to the bottom of the stacked plate assemblies 2, the threaded head of the auxiliary tool is screwed into the threaded hole, and the positioning rod 9 can be lifted out by lifting the auxiliary tool.

[0047] In this embodiment, as Figures 1 to 6 shown, the length of the positioning rod 9 is 400 mm to 1000 mm, and the diameter of the positioning rod 9 is 0.5 mm to 1 mm smaller than the diameter of the positioning hole 7. The stacking height of the finished product of a large electrolytic cell can generally reach 4000 mm or exceed 4000 mm. If the positioning rod 9 is set too short, it is not conducive to the positioning effect. If the positioning rod 9 is set too long, it is easy to have problems with being unable to extract. Therefore, a length of 400 mm to 1000 mm is preferable. Generally, the clearance between the positioning rod 9 and the positioning hole 7 of the stacked workpiece is small, generally set at 0.5 mm to 1 mm. If the clearance is too large, it cannot play a positioning role. If the clearance is too small, it is easy to get stuck and difficult to extract. The positioning rod 9 is preferably made of a material with a relatively light weight, high strength, and not easy to bend. Usually, the overall structure of the water electrolysis hydrogen production electrolytic cell is a filter press type. After the overall assembly is completed, the outer shape is similar to a cylinder. Among them, the electrode plate 17 is in the shape of a disc, made of metal, and is welded by a variety of components. The sealing gasket 19 is in the shape of a circular ring, made of modified fluoroplastics, with relatively soft rigidity. The diaphragm cloth 18 is in the shape of a circular sheet, with a soft texture.

[0048] In the present invention, specific examples are used to illustrate the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An assembly method for a water electrolysis hydrogen production electrolyzer, characterized in that, It includes the following steps: S1. Mark marking lines on the plate body sides of the plate electrode assembly, the bottom end pressing plate and the top end pressing plate correspondingly; S2. Provide at least two positioning holes correspondingly on the front sides of the plate body of the plate electrode assembly, the bottom end pressing plate and the top end pressing plate, and the positioning holes are arranged at intervals along the same circumference; S3. Install the bottom end pressing plate on the assembly base, measure the levelness by aligning the horizontal marking line of the marking instrument with the upper end face of the bottom end pressing plate, and level the bottom end pressing plate according to the measurement result; S4. Insert a positioning rod into the positioning hole of the bottom end pressing plate. The positioning rod is provided with a pin hole penetrating through the rod body. Pass the positioning hole of the plate electrode assembly through the corresponding positioning rod for stacking. During the stacking process, at least two of the marking lines on the plate body side are aligned with the vertical marking line of the marking instrument for verticality measurement, and adjust the plate electrode assembly in time during the stacking process according to the measurement result. When the stacking height is close to the set height of the pin hole, insert a positioning pin with a length greater than the diameter of the positioning hole into the pin hole, continue to stack the plate electrode assembly, insert and pull out the positioning pin during the stacking process to cooperate with the stacking of the plate electrode assembly. When pulling out the positioning pin, lift the positioning rod to make the pin hole higher than the newly stacked plate electrode assembly. After the stacking is completed, place the top end pressing plate for capping. The top end of the positioning rod is provided with a threaded hole, and an auxiliary tool with a threaded head at the preparatory end is prepared. When the positioning rod accidentally falls to the bottom of the stacked plate electrode assembly, screw the threaded head into the threaded hole and lift the auxiliary tool to lift out the positioning rod; S5. Insert a pull rod into the pull rod holes of the top end pressing plate and the bottom end pressing plate, sleeved with pressing pieces at both ends of the pull rod respectively, and screw in nuts to press the pressing pieces on the plate surfaces of the bottom end pressing plate and the top end pressing plate respectively.

2. The assembly method of a water electrolysis hydrogen production electrolyzer according to claim 1, characterized in that, It includes at least three or more of the marking lines, and the positions where the marking lines are located are at the endpoints of a regular polygon, and the center of the regular polygon is the center of the front side of the plate body.

3. The assembly method of a water electrolysis hydrogen production electrolyzer according to claim 1, characterized in that, It includes four of the marking lines, and the four marking lines are located on the cross center line of the front side of the plate body.

4. A method for assembling a water electrolysis hydrogen production electrolyzer according to claim 2, characterized in that, The marking lines are marked by drawing lines or engraving.

5. The assembly method of a water electrolysis hydrogen production electrolyzer according to claim 2, characterized in that, In step S2, taking the cross center line as a quadrant, at least two different quadrants are provided with the positioning holes.

6. The assembly method of a water electrolysis hydrogen production electrolyzer according to claim 4, characterized in that, In step S2, one positioning hole is provided in each of the four quadrants.

7. A method for assembling a water electrolysis hydrogen production electrolyzer according to any one of claims 1-6, characterized in that, The marking instrument adopts an infrared marking instrument or a laser marking instrument.

8. A method for assembling a water electrolysis hydrogen production electrolyzer according to claim 1, characterized in that, The length of the positioning rod is 400mm - 1000mm, and the diameter of the positioning rod is 0.5mm - 1mm smaller than the diameter of the positioning hole.

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