PEM electrolytic cell hydrogen production unit and manufacturing method thereof

Abstract

The invention discloses a PEM electrolytic cell hydrogen production unit and a manufacturing method thereof. The PEM electrolytic cell hydrogen production unit comprises a cathode plate, a first cathode sealing gasket, a cathode frame, a cathode gas diffusion layer, a second cathode sealing gasket, a membrane electrode, an anode frame, an anode gas diffusion layer, an anode sealing gasket and an anode plate. According to the PEM electrolytic cell hydrogen production unit, the first cathode sealing gasket, the cathode frame and the second cathode sealing gasket in the frame area of the PEM electrolytic cell hydrogen production unit are mutually clamped and hermetically connected, and the anode frame and the anode sealing gasket are mutually clamped and hermetically connected, so that the air tightness under the high pressure difference condition is improved; the mutual clamping and sealing connection mode ensures that the sealing material is not blown out by high-pressure hydrogen, so that the high-pressure sealing capability of the whole PEM electrolytic cell hydrogen production unit is improved, the sealing performance of the membrane electrode is ensured, the membrane electrode is prevented from being sheared and damaged by the plastic frame, and the service life of the whole PEM electrolytic cell hydrogen production unit is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of production and processing of PEM water electrolyzers, and in particular to a PEM electrolyzer hydrogen production unit and a manufacturing method thereof. Background Art

[0002] ‌PEM electrolyzer‌ is a water electrolysis hydrogen production equipment that uses a proton exchange membrane (PEM) as a solid electrolyte. Usually, the electrolyzer core unit for hydrogen production by electrolysis of water consists of anode and cathode plates, anode sealing gaskets, anode plastic frames, anode metal mesh, membrane electrode MEA, cathode plastic frames, cathode sealing gaskets and anode and cathode plates, and the membrane electrode is added between the cathode and cathode plastic frames. In order to seal water, hydrogen and oxygen in the corresponding areas of the water electrolyzer, it is necessary to set sealing gaskets at the corresponding positions on the frame. Since the sealing gaskets are generally made of PTFE, which is prone to creep, the plastic frame generally has sealing features at the sealing structure. This will cause the plastic frame to be thicker, usually more than 1.5mm, and the anode and cathode plates are usually thinner planar structures with a thickness of more than 0.75mm. This frame sealing structure has the following defects: 1. The processing tolerance requirements at the frame sealing structure are very high, and ordinary processing technology cannot meet the use requirements, resulting in high costs. 2. The use of thinner PTFE sealing gaskets has more sealing defects, resulting in an increased risk of leakage. 3. To prevent hydrogen leakage under high pressure, the sealing surface pressure is increased, resulting in a high assembly pressure of the entire electrolyzer, which in turn causes shear rupture of the membrane electrode proton membrane. 4. The traditional sealing structure results in a maximum pressure of only 5MPa for the electrolyzer, and the pressure level of the differential pressure electrolyzer is only around 3MPa. Summary of the invention

[0003] The embodiment of the present application provides a PEM electrolyzer hydrogen production unit and a method for manufacturing the same, which can solve the technical problems that the frame sealing structure of the PEM electrolyzer hydrogen production unit has poor airtightness under high pressure difference conditions, poor durability caused by proton membrane shear stress concentration, and difficulty in increasing the electrolyzer pressure.

[0004] The embodiment of the present application provides a PEM electrolyzer hydrogen production unit, including: a cathode plate, a first cathode sealing gasket, a cathode frame, a cathode gas diffusion layer, a second cathode sealing gasket, a membrane electrode, an anode frame, an anode gas diffusion layer, an anode sealing gasket, and an anode plate; The PEM electrolyzer hydrogen production unit is provided with a central reaction zone and a frame zone; the cathode plate, the cathode gas diffusion layer, the membrane electrode, the anode gas diffusion layer and the anode plate are sequentially arranged in the central reaction zone, and the cathode plate, the first cathode sealing gasket, the cathode frame, the second cathode sealing gasket, the membrane electrode, the anode frame, the anode sealing gasket and the anode plate are sequentially arranged in the frame zone; The first cathode sealing gasket, the cathode frame and the second cathode sealing gasket are mutually clamped and sealed, and the anode frame and the anode sealing gasket are mutually clamped and sealed.

[0005] Furthermore, the border area is arranged around the central reaction area, and the first cathode sealing gasket, the cathode frame, the second cathode sealing gasket, the anode frame, and the anode sealing gasket in the central reaction area are provided with a central through hole, and an anode common flow channel and a cathode common flow channel are provided in the border area; the cathode frame is provided with a cathode microchannel, and the cathode common flow channel is connected to the central through hole through the cathode microchannel; the anode frame is provided with an anode microchannel, and the anode common flow channel is connected to the central through hole through the anode microchannel.

[0006] Furthermore, the first cathode sealing gasket and the second cathode sealing gasket are symmetrically arranged on both sides of the cathode frame, and the first cathode sealing gasket or the second cathode sealing gasket seals the anode microchannel.

[0007] Furthermore, when the anode microchannel is arranged adjacent to the first cathode sealing gasket or the second cathode sealing gasket, the first cathode sealing gasket or the second cathode sealing gasket is provided with an anode groove corresponding to the anode microchannel, and an anode channel cover plate is connected in the anode groove, and the anode channel cover plate seals one side of the anode microchannel.

[0008] Furthermore, a first sealing ridge is provided on a side of the cathode frame corresponding to the first cathode sealing gasket, and a second sealing ridge is provided on a side of the cathode frame corresponding to the first cathode sealing gasket, and the first sealing ridge and the second sealing ridge are mutually clamped and sealed.

[0009] Furthermore, a third sealing ridge is provided on a side of the cathode frame corresponding to the second cathode sealing gasket, and a fourth sealing ridge is provided on a side of the cathode frame corresponding to the second cathode sealing gasket, and the third sealing ridge and the fourth sealing ridge are mutually clamped and sealed.

[0010] Furthermore, the anode sealing gasket is provided with a cathode groove corresponding to the cathode microchannel, and a cathode channel cover plate is connected in the cathode groove, and the cathode channel cover plate seals one side of the cathode microchannel.

[0011] Furthermore, a fifth sealing ridge is provided on a side of the anode frame corresponding to the anode sealing gasket, and a sixth sealing ridge is provided on a side of the anode sealing gasket corresponding to the anode frame, and the fifth sealing ridge and the sixth sealing ridge are mutually clamped and sealed.

[0012] Furthermore, the cathode gas diffusion layer is carbon paper, the anode gas diffusion layer is a metal mesh, the material of the cathode plate and the anode plate includes titanium plate, the surfaces of the cathode plate and the anode plate are provided with a platinum coating, the material of the first cathode sealing gasket, the second cathode sealing gasket and the anode sealing gasket includes one of fluororubber, EPDM rubber, AEM rubber, TPV rubber, nitrile rubber and silicone rubber, and the material of the cathode frame and the anode frame includes one of polysulfone, polyetherimide, polyphenylene sulfide, polyetheretherketone, and polyimide.

[0013] The present application also provides a method for manufacturing a PEM electrolyzer hydrogen production unit, comprising: The installation order of the PEM electrolyzer hydrogen production unit is set as cathode plate, first cathode sealing gasket, cathode frame, cathode gas diffusion layer, second cathode sealing gasket, membrane electrode, anode frame, anode gas diffusion layer, anode sealing gasket, and anode plate.

[0014] The PEM electrolyzer hydrogen production unit and its manufacturing method provided in the embodiment of the present application increase the airtightness under high pressure difference conditions by setting a first cathode sealing gasket in the frame area of ​​the PEM electrolyzer hydrogen production unit, a cathode frame and a second cathode sealing gasket are mutually clamped and sealed, and an anode frame and an anode sealing gasket are mutually clamped and sealed. The mutually clamped and sealed connection method ensures that the sealing material is not blown out by the high-pressure hydrogen, thereby improving the high-pressure sealing capability of the entire PEM electrolyzer hydrogen production unit, ensuring the sealing performance of the membrane electrode while ensuring that the membrane electrode is not damaged by shearing of the plastic frame to ensure the life of the entire PEM electrolyzer hydrogen production unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0016] Figure 1 This is a schematic structural diagram of the PEM electrolyzer hydrogen production unit in a flattened state provided in an embodiment of the present application.

[0017] Figure 2 A cross-sectional view of a PEM electrolyzer hydrogen production unit provided in an embodiment of the present application.

[0018] Figure 3 A schematic structural diagram of the first cathode sealing gasket provided in an embodiment of the present application.

[0019] Figure 4 A schematic diagram of the structure of the cathode frame provided in an embodiment of the present application.

[0020] Figure 5 A schematic diagram of the structure of the anode sealing gasket provided in an embodiment of the present application.

[0021] Figure 6 A schematic diagram of the structure of the anode frame provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0023] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] Combined with the background technology, for PEM electrolyzers with medium pressures above 3.5MPa, especially high-pressure PEM electrolyzers, the force on the sealing ring needs to be greater. In order to improve the sealing performance, the hardness of the sealing ring needs to be increased to obtain a higher elastic modulus, so as to obtain the required resilience for sealing within a limited compression deformation. There are few types of existing materials that can meet the requirements, and they are expensive, which restricts the cost and commercial application scope of PEM electrolyzers. At the same time, blindly increasing the hardness of the sealing material will inevitably affect the filling performance of the sealing ring for the pits and gaps on the mating surface and the assembly force of the entire electrolyzer. It is difficult to directly solve the sealing performance problem from the hardness or elastic modulus, which limits the industrial use and promotion of rubber sealing materials in the field of water electrolysis hydrogen production.

[0026] For details, please refer to Figures 1 to 6An embodiment of the present application provides a PEM electrolyzer hydrogen production unit, which includes a cathode plate 602, a first cathode sealing gasket 503, a cathode frame 302, a cathode gas diffusion layer 202, a second cathode sealing gasket 502, a membrane electrode 100, an anode frame 301, an anode gas diffusion layer 201, an anode sealing gasket 501, and an anode plate 601.

[0027] like Figure 2 As shown, the PEM electrolyzer hydrogen production unit is provided with a central reaction zone 10 and a frame zone 20; the cathode plate 602, the cathode gas diffusion layer 202, the membrane electrode 100, the anode gas diffusion layer 201 and the anode plate 601 are sequentially arranged in the central reaction zone 10, and the cathode plate 602, the first cathode sealing gasket 503, the cathode frame 302, the second cathode sealing gasket 502, the membrane electrode 100, the anode frame 301, the anode sealing gasket 501 and the anode plate 601 are sequentially arranged in the frame zone 20; the first cathode sealing gasket 503, the cathode frame 302 and the second cathode sealing gasket 502 are mutually snap-fitted and sealed, and the anode frame 301 and the anode sealing gasket 501 are mutually snap-fitted and sealed.

[0028] like Figure 2-Figure 6 As shown, the border area 20 is arranged around the central reaction area 10, and the first cathode sealing gasket 503, the cathode frame 302, the second cathode sealing gasket 502, the anode frame 301, and the anode sealing gasket 501 in the central reaction area 10 are provided with a central through hole 703, and an anode common flow channel 701 and a cathode common flow channel 702 are provided in the border area 20; the cathode frame 302 is provided with a cathode microchannel 903, and the cathode common flow channel 702 is connected with the central through hole 703 through the cathode microchannel 903; the anode frame 301 is provided with an anode microchannel 902, and the anode common flow channel 701 is connected with the central through hole 703 through the anode microchannel 902.

[0029] The cross-sectional shapes of the cathode microchannel 903 and the anode microchannel 902 are rectangular or semicircular.

[0030] Furthermore, the first cathode sealing gasket 503 and the second cathode sealing gasket 502 are symmetrically arranged on both sides of the cathode frame 302 , and the first cathode sealing gasket 503 or the second cathode sealing gasket 502 seals the anode microchannel 902 .

[0031] Furthermore, when the anode microchannel 902 is arranged adjacent to the first cathode sealing gasket 503 or the second cathode sealing gasket 502, the first cathode sealing gasket 503 or the second cathode sealing gasket 502 is provided with an anode groove 901 corresponding to the anode microchannel 902, and an anode channel cover plate 401 is connected in the anode groove 901, and the anode channel cover plate 401 seals one side of the anode microchannel 902.

[0032] like Figure 3 As shown, preferably, the anode microchannel 902 is disposed adjacent to the first cathode sealing gasket 503, and the first cathode sealing gasket 503 seals the anode microchannel 902. The first cathode sealing gasket 503 is provided with an anode groove 901 corresponding to the anode microchannel 902, and the anode channel cover plate 401 is connected in the anode groove 901.

[0033] like Figure 4 As shown, the cathode frame 302 is provided with a first sealing ridge 801 on the side corresponding to the first cathode sealing gasket 503, and the first cathode sealing gasket 503 is provided with a second sealing ridge 802 on the side corresponding to the cathode frame 302, and the first sealing ridge 801 and the second sealing ridge 802 are mutually clamped and sealed.

[0034] Furthermore, the cathode frame 302 is provided with a third sealing ridge 803 on the side corresponding to the second cathode sealing gasket 502, and the second cathode sealing gasket 502 is provided with a fourth sealing ridge 804 on the side corresponding to the cathode frame 302, and the third sealing ridge 803 and the fourth sealing ridge 804 are mutually clamped and sealed.

[0035] like Figure 5 As shown, the anode sealing gasket 501 is provided with a cathode groove 904 corresponding to the cathode microchannel 903 , and a cathode channel cover plate 402 is connected in the cathode groove 904 , and the cathode channel cover plate 402 seals one side of the cathode microchannel 903 .

[0036] like Figure 6 As shown, the anode frame 301 is provided with a fifth sealing ridge 805 on one side corresponding to the anode sealing gasket 501, and the anode sealing gasket 501 is provided with a sixth sealing ridge 806 on one side corresponding to the anode frame 301, and the fifth sealing ridge 805 and the sixth sealing ridge 806 are mutually clamped and sealed.

[0037] Among them, the width of the first sealing rib 801, the third sealing rib 803, and the fifth sealing rib 805 is 1-10mm, the height is 0.5-5mm, and the interval is 1-10mm. The width of the second sealing rib 802, the fourth sealing rib 804, and the sixth sealing rib 806 is 1-10mm, the height is 0.5-2mm, and the interval is 1-10mm. The shapes of the first sealing rib 801, the third sealing rib 803, and the fifth sealing rib 805 are rectangular, trapezoidal, semi-elliptical, and semicircular. The shapes of the second sealing rib 802, the fourth sealing rib 804, and the sixth sealing rib 806 are rectangular, elliptical, semicircular, bimodal, etc. The sealing rib structures and quantities on both sides of the sealing gasket are not exactly the same.

[0038] Preferably, the cathode plate 602 and the anode plate 601 are both planar structures with the same structure. The electrolyte inlet and outlet, flow field, and hydrogen outlet of the cathode plate 602 and the anode plate 601 are all provided with sealing ridges for fixing the sealing gasket to ensure the sealing effect of the electrolytic cell and prevent leakage of the electrolyte and the generated oxygen and hydrogen.

[0039] Furthermore, the cathode gas diffusion layer 202 is carbon paper, the anode gas diffusion layer 201 is a metal mesh, the cathode plate 602 and the anode plate 601 are made of titanium plates, the surfaces of the cathode plate 602 and the anode plate 601 are provided with a platinum coating, the first cathode sealing gasket 503, the second cathode sealing gasket 502 and the anode sealing gasket 501 are made of one of fluororubber, EPDM rubber, AEM rubber, TPV rubber, nitrile rubber and silicone rubber, and the cathode frame 302 and the anode frame 301 are made of one of PSU (polysulfone), PEI (polyetherimide), PPS (polyphenylene sulfide), PEEK (polyetheretherketone), and PI (polyimide).

[0040] It is understandable that the material of the anode channel cover plate 401 and the cathode channel cover plate 402 includes one of PSU, PEI, PPS, PEEK, and PI. The cathode frame 302, the anode frame 301, the anode channel cover plate 401, and the cathode channel cover plate 402 are made of plastic material, and the molding method is injection molding or machining molding.

[0041] The first cathode sealing gasket 503, the second cathode sealing gasket 502 and the anode sealing gasket 501 use rubber materials as sealing materials, removing sealing materials such as PTFE sealing membranes in traditional electrolytic cells, and avoiding the occurrence of high-temperature creep of PTFE. The high-pressure sealing performance of the entire electrolytic cell is guaranteed. The sealing gasket material is generally fluororubber, EPDM rubber, AEM rubber, TPV rubber, nitrile rubber and silicone rubber, and the molding process is compression molding or injection molding.

[0042] The present application avoids the problems of large dimensional tolerance fluctuations, difficult cover plate fixing, and low cover plate structural strength caused by the sealing ridges and flow channels in the plastic frame during the injection molding process. By adjusting the relative height of the rubber ridges and the frame ridges, the rubber ridges and the body are subjected to the assembly pressure, which not only ensures that the assembly pressure meets the ability to seal high-pressure hydrogen during the assembly of the electrolyzer, but also avoids excessive compression of the rubber material, resulting in a reduction in the rubber life. By setting the sealing ridges on the membrane electrode side of the sealing gasket, the sealing performance of the membrane electrode is ensured while ensuring that the membrane electrode is not damaged by shearing of the plastic frame to ensure the life of the entire electrolyzer. The rubber sealing ridges and the frame sealing ridges are engaged with each other to ensure that the sealing material is not blown out by the high-pressure hydrogen, thereby improving the high-pressure sealing capacity of the entire electrolyzer. The rubber sealing gasket makes the entire electrolyzer sealing structure simple, the processing cost low, the assembly simple and modular, and is more conducive to automated production. The presence of the rubber sealing gasket can increase the insulation performance of the entire electrolyzer. The strong resilience of the rubber sealing gasket is conducive to adjusting the assembly force of the entire electrolytic cell, ensuring full contact between the positive and negative plates of the entire electrolytic cell, reducing the contact resistance of the electrolytic cell, and improving the overall performance of the electrolytic cell.

[0043] The present application also provides a method for manufacturing a PEM electrolyzer hydrogen production unit, comprising: The installation order of the PEM electrolyzer hydrogen production unit is as follows: cathode plate 602, first cathode sealing gasket 503, cathode frame 302, cathode gas diffusion layer 202, second cathode sealing gasket 502, membrane electrode 100, anode frame 301, anode gas diffusion layer 201, anode sealing gasket 501, and anode plate 601.

[0044] The PEM electrolyzer hydrogen production unit and its manufacturing method provided in the embodiment of the present application increase the airtightness under high pressure difference conditions by setting the first cathode sealing gasket 503 of the PEM electrolyzer hydrogen production unit frame area 20, the cathode frame 302 and the second cathode sealing gasket 502 are mutually clamped and sealed, and the anode frame 301 and the anode sealing gasket 501 are mutually clamped and sealed, thereby improving the airtightness under high pressure difference conditions. The mutually clamped and sealed connection method ensures that the sealing material is not blown out by the high-pressure hydrogen, thereby improving the high-pressure sealing capability of the entire PEM electrolyzer hydrogen production unit, ensuring the sealing performance of the membrane electrode while ensuring that the membrane electrode is not damaged by shearing of the plastic frame to ensure the life of the entire PEM electrolyzer hydrogen production unit.

[0045] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0046] The above is a detailed introduction to a PEM electrolyzer hydrogen production unit and a manufacturing method provided in an embodiment of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A PEM electrolyzer hydrogen production unit, characterized in that: include: Cathode plate, first cathode sealing gasket, cathode frame, cathode gas diffusion layer, second cathode sealing gasket, membrane electrode, anode frame, anode gas diffusion layer, anode sealing gasket, anode plate; The PEM electrolyzer hydrogen production unit is provided with a central reaction zone and a frame zone; the cathode plate, the cathode gas diffusion layer, the membrane electrode, the anode gas diffusion layer and the anode plate are sequentially arranged in the central reaction zone, and the cathode plate, the first cathode sealing gasket, the cathode frame, the second cathode sealing gasket, the membrane electrode, the anode frame, the anode sealing gasket and the anode plate are sequentially arranged in the frame zone; The first cathode sealing gasket, the cathode frame and the second cathode sealing gasket are mutually clamped and sealed, and the anode frame and the anode sealing gasket are mutually clamped and sealed; A first sealing ridge is provided on a side of the cathode frame corresponding to the first cathode sealing gasket, a second sealing ridge is provided on a side of the first cathode sealing gasket corresponding to the cathode frame, and the first sealing ridge and the second sealing ridge are mutually clamped and sealed; a third sealing ridge is provided on a side of the cathode frame corresponding to the second cathode sealing gasket, a fourth sealing ridge is provided on a side of the second cathode sealing gasket corresponding to the cathode frame, and the third sealing ridge and the fourth sealing ridge are mutually clamped and sealed; a fifth sealing ridge is provided on a side of the anode frame corresponding to the anode sealing gasket, a sixth sealing ridge is provided on a side of the anode sealing gasket corresponding to the anode frame, and the fifth sealing ridge and the sixth sealing ridge are mutually clamped and sealed; the shape of the first sealing ridge, the third sealing ridge and the fifth sealing ridge is one of a rectangle, a trapezoid, a semi-ellipse and a semicircle; the shape of the second sealing ridge, the fourth sealing ridge and the sixth sealing ridge is one of a rectangle, an ellipse, a semicircle and a double peak.

2. The PEM electrolyzer hydrogen production unit according to claim 1, characterized in that: The border area is arranged around the central reaction area, and the first cathode sealing gasket, the cathode frame, the second cathode sealing gasket, the anode frame, and the anode sealing gasket in the central reaction area are provided with a central through hole, and an anode common flow channel and a cathode common flow channel are provided in the border area; the cathode frame is provided with a cathode microchannel, and the cathode common flow channel is connected to the central through hole through the cathode microchannel; the anode frame is provided with an anode microchannel, and the anode common flow channel is connected to the central through hole through the anode microchannel.

3. The PEM electrolyzer hydrogen production unit according to claim 2, characterized in that: The first cathode sealing gasket and the second cathode sealing gasket are symmetrically arranged on both sides of the cathode frame, and the first cathode sealing gasket or the second cathode sealing gasket seals the anode microchannel.

4. The PEM electrolyzer hydrogen production unit according to claim 3, characterized in that: When the anode microchannel is arranged adjacent to the first cathode sealing gasket or the second cathode sealing gasket, the first cathode sealing gasket or the second cathode sealing gasket is provided with an anode groove corresponding to the anode microchannel, and an anode channel cover plate is connected in the anode groove, and the anode channel cover plate seals one side of the anode microchannel.

5. The PEM electrolyzer hydrogen production unit according to claim 2, characterized in that: The anode sealing gasket is provided with a cathode groove corresponding to the cathode microchannel, and a cathode channel cover plate is connected in the cathode groove, and the cathode channel cover plate seals one side of the cathode microchannel.

6. The PEM electrolyzer hydrogen production unit according to claim 1, characterized in that: The cathode gas diffusion layer is carbon paper, the anode gas diffusion layer is a metal mesh, the cathode plate and the anode plate are made of titanium plates, the surfaces of the cathode plate and the anode plate are provided with platinum coatings, the first cathode sealing gasket, the second cathode sealing gasket and the anode sealing gasket are made of one of fluororubber, EPDM rubber, AEM rubber, TPV rubber, nitrile rubber and silicone rubber, and the cathode frame and the anode frame are made of one of polysulfone, polyetherimide, polyphenylene sulfide, polyetheretherketone and polyimide.

7. A method for manufacturing a PEM electrolyzer hydrogen production unit according to any one of claims 1 to 6, characterized in that: include: The installation order of the PEM electrolyzer hydrogen production unit is set as cathode plate, first cathode sealing gasket, cathode frame, cathode gas diffusion layer, second cathode sealing gasket, membrane electrode, anode frame, anode gas diffusion layer, anode sealing gasket, and anode plate.

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