PEM electrolytic bath pole plate and sealing structure thereof

Abstract

The PEM electrolytic cell polar plate comprises a plate body, a first hydrogen outlet is formed in one end of the plate body, and a second hydrogen outlet is formed in the other end of the plate body; a water inlet is formed in one side of the plate body, and a water outlet is formed in the other side of the plate body; the direction in which one end is located is perpendicular to the direction in which one side is located; a first sealing groove is formed in one side face of the plate body in the circumferential direction. A second sealing groove is formed in the other side face of the plate body in the circumferential direction. The two sides of the bottom of the first sealing groove and the two sides of the bottom of the second sealing groove are chamfered. The invention further provides a sealing structure. The PEM electrolytic cell polar plate has good mechanical strength and conductivity, and can uniformly bear pressure under the high-pressure condition. The sealing structure prepared from the PEM electrolytic cell polar plate can keep good sealing performance at high pressure and high temperature, and gas leakage is effectively prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrogen production, and in particular relates to a PEM electrolyzer plate and a sealing structure thereof. Background Art

[0002] PEM electrolyzer (proton exchange membrane electrolyzer) is a highly efficient water electrolysis technology that decomposes water into hydrogen and oxygen through a proton exchange membrane. It drives the reaction between the anode and cathode through an electric current, with the anode generating oxygen and protons, and the cathode combining protons with electrons to generate hydrogen. PEM electrolyzers have the advantages of fast response, high energy conversion efficiency and compact design, and have broad application prospects in many fields, including: as a hydrogen production device for renewable energy systems such as wind and solar energy, supporting the use of clean energy; in chemical, metallurgical and other industrial fields, as an efficient way to produce hydrogen, meeting the demand for high-pressure hydrogen; in terms of hydrogen energy infrastructure, providing high-pressure hydrogen supply for hydrogen vehicles and other hydrogen energy applications.

[0003] Compared with traditional electrolyzers, the current mainstream research and development direction of PEM electrolyzers is to adapt to high-pressure environments. The design of high-pressure PEM electrolyzers can withstand higher operating pressures (usually 30 bar to 100 bar or higher), so that the electrolysis process can be carried out under high pressure, thereby reducing the energy consumption of subsequent compression, improving the efficiency of the overall system, and being easier to store and transport, suitable for the needs of the energy supply chain.

[0004] Although high-pressure PEM electrolyzers have significant advantages, they still face some technical challenges. First, under high-pressure environments, electrolyzer materials need to have sufficient strength and durability to ensure safe and reliable operation, especially the design and selection of plate and sealing material structures. Second, high-pressure PEM electrolyzers have high requirements for production processes, which makes their production costs relatively high and difficult to apply to large-scale production. Summary of the invention

[0005] The embodiment of the present invention provides a PEM electrolyzer plate and a sealing structure thereof, aiming to solve the problems of poor mechanical strength, durability and reliability, high production cost and the like of the existing PEM electrolyzer under high pressure environment.

[0006] In order to solve the above technical problems, an embodiment of the present invention first provides a PEM electrolyzer plate, comprising a plate body, wherein one end of the plate body is provided with a first hydrogen outlet, and the other end is provided with a second hydrogen outlet; one side of the plate body is provided with a water inlet, and the other side is provided with a water outlet; the direction where the one end is located is perpendicular to the direction where the one side is located;

[0007] A first sealing groove is circumferentially arranged on one side surface of the plate body; a second sealing groove is circumferentially arranged on the other side surface of the plate body; both sides of the bottom of the first sealing groove and both sides of the bottom of the second sealing groove are chamfered.

[0008] As a preferred embodiment, the chamfer has a degree of 30° to 50°. The chamfer refers to an angle formed by a side wall of the first sealing groove (second sealing groove) and a bottom of the first sealing groove (second sealing groove).

[0009] As a preferred embodiment, the first sealing groove and the second sealing groove are arranged opposite to each other and symmetrically.

[0010] As a preferred embodiment, a plurality of first protruding structures are disposed at the bottom of the first sealing groove; and a plurality of second protruding structures are disposed at the bottom of the second sealing groove.

[0011] As a preferred embodiment, a plurality of the first protruding structures are arranged at equal intervals; a plurality of the second protruding structures are arranged at equal intervals.

[0012] As a preferred embodiment, one side surface of the plate body is provided with a first bridge area, a first transition area, a first flow channel area, a second transition area and a second bridge area which are connected in sequence; an end of the first bridge area away from the first transition area is connected to the water inlet; an end of the second bridge area away from the second transition area is connected to the water outlet.

[0013] As a preferred embodiment, the first bridge area and the second bridge area are symmetrically arranged; the first transition area and the second transition area are symmetrically arranged.

[0014] As a preferred embodiment, the first bridge area and the second bridge area both include several first straight flow channels arranged parallel to each other, and first flow channel ridges are arranged between adjacent first straight flow channels; the ratio of the width of the first straight flow channel to the width of the first flow channel ridge is 1:1 to 2:1.

[0015] As a preferred embodiment, the first flow channel area includes several second direct current channels arranged parallel to each other, and the second direct current channels are arranged parallel to the first direct current channels; second flow channel ridges are arranged between adjacent second direct current channels; and the ratio of the width of the second direct current channel to the width of the second flow channel ridge is 1:1 to 2:1.

[0016] As a preferred embodiment, the first transition zone and the second transition zone each include a plurality of rectangular strip blocks arranged perpendicularly to the second direct current channel, and flow channel grooves are arranged between adjacent rectangular strip blocks.

[0017] As a preferred embodiment, the plurality of rectangular strip blocks are evenly distributed in columns and rows; the rectangular strip blocks between two adjacent columns are evenly spaced; and the rectangular strip blocks between two adjacent rows are evenly spaced.

[0018] As a preferred embodiment, the width of the flow channel groove is equal to or similar to the width of the second direct flow channel; and the ratio of the length to the width of the rectangular strip block is 3:1 to 1:1.

[0019] As a preferred embodiment, a third bridge area, a third transition area, a second flow channel area, a fourth transition area and a fourth bridge area which are connected in sequence are provided on the other side of the plate body; one end of the third bridge area away from the third transition area is connected to the first hydrogen outlet; one end of the fourth bridge area away from the fourth transition area is connected to the second hydrogen outlet.

[0020] As a preferred embodiment, the third bridge area and the fourth bridge area are symmetrically arranged; the third transition area and the fourth transition area are symmetrically arranged;

[0021] The third bridge area has the same structure as the first bridge area; the fourth bridge area has the same structure as the second bridge area; the third transition area has the same structure as the first transition area; the fourth transition area has the same structure as the second transition area; and the second flow channel area has the same structure as the first flow channel area.

[0022] On the other hand, an embodiment of the present invention further provides a sealing structure, which includes the PEM electrolyzer plate.

[0023] As a preferred embodiment, the sealing structure includes a first sealing strip, a first PEM electrolyzer plate, a second sealing strip, a membrane electrode, a third sealing strip, a second PEM electrolyzer plate and a fourth sealing strip stacked in sequence; the first sealing strip is arranged in the first sealing groove of the first PEM electrolyzer plate, and the second sealing strip is arranged in the second sealing groove of the first PEM electrolyzer plate; the third sealing strip is arranged in the first sealing groove of the second PEM electrolyzer plate, and the fourth sealing strip is arranged in the second sealing groove of the second PEM electrolyzer plate; the first PEM electrolyzer plate and the second PEM electrolyzer plate are both the PEM electrolyzer plates.

[0024] As a preferred embodiment, the first sealing strip and the third sealing strip are both cathode sealing strips; the second sealing strip and the fourth sealing strip are both anode sealing strips; and gaps are provided between the cathode sealing strip and the first sealing groove and between the anode sealing strip and the second sealing groove.

[0025] As a preferred embodiment, the angle formed by the side wall of the cathode sealing strip and the bottom of the first sealing groove is greater than or equal to the chamfer angle; the angle formed by the side wall of the anode sealing strip and the bottom of the second sealing groove is greater than or equal to the chamfer angle.

[0026] As a preferred embodiment, a first double-peak structure is provided on a side of the cathode sealing strip away from the first sealing groove.

[0027] As a preferred embodiment, a second double-peak structure is provided on a side of the anode sealing strip away from the second sealing groove.

[0028] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects: the PEM electrolyzer plate of the present application has good mechanical strength and electrical conductivity, can achieve uniform pressure bearing under high pressure conditions (30 bar to 100 bar or higher), and can solve the problems of mechanical strength, durability and reliability of the PEM electrolyzer under high pressure. The sealing structure made of the PEM electrolyzer plate of the present application can maintain good sealing under high pressure and high temperature environment, and effectively prevent gas leakage. The structure of the present application is simple, the heat dissipation effect is good, the disassembly and assembly are convenient, the maintenance is convenient, the stability is good, the economy is safe and practical, and it can well meet the needs of actual use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the overall structure of a PEM electrolyzer plate according to an embodiment of the present invention;

[0031] Figure 2 for Figure 1 A schematic structural diagram of another side of a PEM electrolyzer plate;

[0032] Figure 3 A partial cross-sectional structural schematic diagram of a PEM electrolyzer electrode plate according to another embodiment of the present invention;

[0033] Figure 4 An embodiment of the present invention adopts Figure 1 Schematic diagram of the exploded structure of the sealing structure of the PEM electrolyzer plate;

[0034] Figure 5 for Figure 4A partial cross-sectional structural schematic diagram of a sealing structure;

[0035] Figure 6 Another embodiment of the present invention adopts Figure 3 A schematic cross-sectional view of the sealing structure of a PEM electrolyzer plate;

[0036] Figure 7 Another embodiment of the present invention adopts Figure 1 Schematic diagram of the cross-sectional structure of the sealing structure of the PEM electrolyzer plate.

[0037] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] Specifically, Figure 1 to Figure 2 As shown, the embodiment of the present application provides a PEM electrolyzer plate, including a plate body 10, wherein a first hydrogen outlet 11 is provided at one end of the plate body 10, and a second hydrogen outlet 12 is provided at the other end; a water inlet 13 is provided at one side of the plate body 10, and a water outlet 14 is provided at the other side; the direction where the one end is located is perpendicular to the direction where the one side is located;

[0041] A first sealing groove 15 is circumferentially provided on one side of the plate body 10 ; a second sealing groove 16 is circumferentially provided on the other side of the plate body 10 ; both sides of the bottom of the first sealing groove 15 and both sides of the bottom of the second sealing groove 16 are chamfered.

[0042] In the embodiment of the present application, the inlet and outlet of the reactant (water) and the outlet of the product (hydrogen) are arranged in two mutually perpendicular directions of the plate body and are of the same size, which is convenient for the anode and cathode structures of the bipolar plate to share and is more structurally stable. Under the high pressure environment on the hydrogen side, the two reactant inlets and outlets separated by a large distance can reduce the occurrence of hydrogen and oxygen crosstalk to a certain extent, making the water electrolysis reaction safer and more efficient.

[0043] As a preferred embodiment, the chamfer has a degree of 30° to 50°. The chamfer refers to the angle formed by the side wall of the first sealing groove 15 (second sealing groove 16) and the bottom of the first sealing groove 15 (second sealing groove 16).

[0044] By setting the chamfer and controlling its degree, sufficient deformation space can be provided for the sealing strip (i.e., the sealing strip), so that the contact pressure of the sealing strip becomes larger and larger under the assembly pressure, thus forming a good seal; when high pressure is generated on the hydrogen side, a force in the opposite direction of the assembly pressure is generated on the plate, so that the contact pressure of the sealing strip becomes smaller, and the seal is reduced. However, high pressure perpendicular to the side of the sealing strip is generated inside at the same time, pushing the sealing strip to squeeze against the side wall of the sealing groove. When the assembly pressure is stable, the reaction force of the side wall of the sealing groove on the sealing strip increases the contact pressure of the sealing strip, thus maintaining a good seal again, thereby allowing the entire PEM electrolyzer to operate stably under high pressure.

[0045] As a preferred embodiment, the first sealing groove 15 and the second sealing groove 16 are arranged opposite to each other and symmetrically, so as to facilitate the assembly of the sealing structure.

[0046] As a preferred embodiment, Figure 3 and Figure 6 As shown, in another embodiment, a plurality of first protruding structures 151 are disposed at the bottom of the first sealing groove 15 ; a plurality of second protruding structures 161 are disposed at the bottom of the second sealing groove 16 .

[0047] As a preferred embodiment, a plurality of the first protruding structures 151 are arranged at equal intervals; a plurality of the second protruding structures 161 are arranged at equal intervals.

[0048] By arranging a first protruding structure at the bottom of the first sealing groove and a second protruding structure at the bottom of the second sealing groove, the size of the sealing surface is effectively increased, the acting force is dispersed, and the effectiveness of the seal can be ensured even in extreme environments.

[0049] In the embodiment of the present application, the raised structures are evenly distributed in all the sealing grooves. The number of raised structures can be set according to actual needs. In the present embodiment, three are preferred, and two, four or other numbers can also be used. Preferably, the ratio of width to height on the cross section of the first raised structure (or the second raised structure) is in the range of 10:1 to 30:1, which effectively increases the size of the sealing surface, disperses the force, and ensures the effectiveness of the seal even in extreme environments. Positioning holes 17 are provided at the end corners of the pole plate 10.

[0050] As a preferred embodiment, one side surface of the plate body 10 is provided with a first bridge area A, a first transition area B, a first flow channel area C, a second transition area D and a second bridge area E which are connected in sequence; the end of the first bridge area A away from the first transition area B is connected to the water inlet 13; the end of the second bridge area E away from the second transition area D is connected to the water outlet 14.

[0051] As a preferred embodiment, the first bridge area A and the second bridge area E are symmetrically arranged; the first transition area B and the second transition area D are symmetrically arranged.

[0052] As a preferred embodiment, the first bridge area A and the second bridge area E both include several first straight flow channels arranged parallel to each other, and first flow channel ridges are arranged between adjacent first straight flow channels; the ratio of the width of the first straight flow channel to the width of the first flow channel ridge is 1:1 to 2:1.

[0053] As a preferred embodiment, the first flow channel area C includes several second direct current channels arranged parallel to each other, and the second direct current channels are arranged parallel to the first direct current channels; second flow channel ridges are arranged between adjacent second direct current channels; and the ratio of the width of the second direct current channel to the width of the second flow channel ridge is 1:1 to 2:1.

[0054] As a preferred embodiment, the first transition zone B and the second transition zone D each include a plurality of rectangular strip blocks vertically arranged to the second direct current channel, and flow channel grooves are arranged between adjacent rectangular strip blocks.

[0055] As a preferred embodiment, the plurality of rectangular strip blocks are evenly distributed in columns and rows; the rectangular strip blocks between two adjacent columns are evenly spaced; and the rectangular strip blocks between two adjacent rows are evenly spaced.

[0056] As a preferred embodiment, the width of the flow channel groove is equal to or similar to the width of the second direct flow channel; and the ratio of the length to the width of the rectangular strip block is 3:1 to 1:1.

[0057] As a preferred embodiment, the other side of the plate body 10 is provided with a third bridge area F, a third transition area G, a second flow channel area H, a fourth transition area I and a fourth bridge area J which are connected in sequence; the end of the third bridge area F away from the third transition area G is connected to the first hydrogen outlet 11; the end of the fourth bridge area J away from the fourth transition area I is connected to the second hydrogen outlet 12.

[0058] As a preferred embodiment, the third bridge area F is symmetrically arranged with the fourth bridge area J; the third transition area G is symmetrically arranged with the fourth transition area I;

[0059] The third bridge area F has the same structure as the first bridge area A; the fourth bridge area J has the same structure as the second bridge area E; the third transition area G has the same structure as the first transition area B; the fourth transition area I has the same structure as the second transition area D; the second flow channel area H has the same structure as the first flow channel area C. In the present application, the direct current channel of the second flow channel area is arranged vertically to the direct current channel of the first flow channel area.

[0060] The PEM electrolyzer plate of the present application is a bipolar plate structure, that is, flow channel structures for anode (water, oxygen) and cathode (hydrogen) transmission are respectively arranged on both sides of a single plate, which can ensure the uniform distribution and rapid removal of water and reaction gas. At the same time, the depth and width of the flow channel are designed according to the needs of flow rate and flow pattern to reduce pressure loss and improve gas transmission efficiency.

[0061] In the embodiment of the present application, the ratio of the depth to the width of each flow channel is 1:1 to 1:1.5. By controlling the width of each flow channel and the ridge width of the electrode plate, good electrical contact and mechanical strength between components are ensured in the assembly mode of electrode plate + membrane electrode + electrode plate. In the high-pressure environment on the hydrogen side, there is enough support surface to resist high-pressure impact, effectively avoiding the risk of membrane electrode perforation and rupture.

[0062] On the other hand, an embodiment of the present invention further provides a sealing structure, which includes the PEM electrolyzer plate.

[0063] As a preferred embodiment, Figures 4 to 5 As shown, the sealing structure includes a first sealing strip 100, a first PEM electrolyzer plate 200, a second sealing strip 300, a membrane electrode 400, a third sealing strip 500, a second PEM electrolyzer plate 600 and a fourth sealing strip 700 which are stacked in sequence; the first sealing strip 100 is arranged in the first sealing groove of the first PEM electrolyzer plate 200, and the second sealing strip 300 is arranged in the second sealing groove of the first PEM electrolyzer plate 200; the third sealing strip 500 is arranged in the first sealing groove of the second PEM electrolyzer plate 600, and the fourth sealing strip 700 is arranged in the second sealing groove of the second PEM electrolyzer plate 600; the first PEM electrolyzer plate 200 and the second PEM electrolyzer plate 600 are both the PEM electrolyzer plates.

[0064] As a preferred embodiment, the first sealing strip 100 and the third sealing strip 500 are both cathode sealing strips; the second sealing strip 300 and the fourth sealing strip 700 are both anode sealing strips; a gap 800 is provided between the cathode sealing strip and the first sealing groove, and between the anode sealing strip and the second sealing groove. By providing the gap, the sealing strip has sufficient deformation space under assembly pressure.

[0065] As a preferred embodiment, the angle a2 formed by the side wall of the cathode sealing strip and the bottom of the first sealing groove is greater than or equal to the angle of the chamfer a1; the angle formed by the side wall of the anode sealing strip and the bottom of the second sealing groove is greater than or equal to the angle of the chamfer.

[0066] As a preferred embodiment, Figure 7 As shown, in yet another embodiment, a first double-peak structure a3 is provided on a side of the cathode sealing strip away from the first sealing groove.

[0067] As a preferred embodiment, Figure 7 As shown, in yet another embodiment, a second double-peak structure a4 is provided on a side of the anode sealing strip away from the second sealing groove.

[0068] By setting a double-peak structure on the cathode sealing strip and the anode sealing strip, the double-peak structure has higher compressive and tensile strengths, fits more closely to the contact surface after compression, can adapt to higher pressures, and can provide better sealing effects under different pressure and temperature conditions.

[0069] In the embodiment of the present application, the double peak structures are all arranged on the side surface in contact with the membrane electrode, and in each of the first double peak structures, the ratio of the distance between the two convex peaks to the width of the first double peak structure is in the range of 1.5:1 to 1:1, and the ratio of the width to the height of the first double peak structure is in the range of 10:1 to 5:1. In each of the second double peak structures, the ratio of the distance between the two convex peaks to the width of the second double peak structure is in the range of 1.5:1 to 1:1, and the ratio of the width to the height of the second double peak structure is in the range of 10:1 to 5:1.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A PEM electrolyzer plate, characterized in that: It comprises a plate body, wherein one end of the plate body is provided with a first hydrogen outlet, and the other end is provided with a second hydrogen outlet; one side of the plate body is provided with a water inlet, and the other side is provided with a water outlet; the direction where the one end is located is perpendicular to the direction where the one side is located; A first sealing groove is circumferentially arranged on one side surface of the plate body; a second sealing groove is circumferentially arranged on the other side surface of the plate body; both sides of the bottom of the first sealing groove and both sides of the bottom of the second sealing groove are chamfered.

2. The PEM electrolyzer plate according to claim 1, characterized in that: The degree of the chamfer is 30° to 50°.

3. The PEM electrolyzer plate according to claim 1, characterized in that: The first sealing groove and the second sealing groove are opposite to each other and are symmetrically arranged.

4. The PEM electrolyzer plate according to claim 1, characterized in that: A plurality of first protruding structures are disposed at the bottom of the first sealing groove; a plurality of second protruding structures are disposed at the bottom of the second sealing groove.

5. The PEM electrolyzer plate according to claim 4, characterized in that: A plurality of the first protruding structures are arranged at equal intervals; a plurality of the second protruding structures are arranged at equal intervals.

6. The PEM electrolyzer plate according to claim 1, characterized in that: A first bridge area, a first transition area, a first flow channel area, a second transition area and a second bridge area are sequentially connected on one side of the plate body; an end of the first bridge area away from the first transition area is connected to the water inlet; an end of the second bridge area away from the second transition area is connected to the water outlet; The other side of the plate body is provided with a third bridge area, a third transition area, a second flow channel area, a fourth transition area and a fourth bridge area which are connected in sequence; one end of the third bridge area away from the third transition area is connected to the first hydrogen outlet; one end of the fourth bridge area away from the fourth transition area is connected to the second hydrogen outlet.

7. The PEM electrolyzer plate according to claim 6, characterized in that: The first bridge area and the second bridge area are symmetrically arranged; the first transition area and the second transition area are symmetrically arranged; The third bridge area is symmetrically arranged with the fourth bridge area; the third transition area is symmetrically arranged with the fourth transition area; The third bridge area has the same structure as the first bridge area; the fourth bridge area has the same structure as the second bridge area; the third transition area has the same structure as the first transition area; the fourth transition area has the same structure as the second transition area; and the second flow channel area has the same structure as the first flow channel area.

8. The PEM electrolyzer plate according to claim 6, characterized in that: The first bridge area and the second bridge area each include a plurality of first straight flow channels arranged in parallel with each other, and a first flow channel ridge is arranged between adjacent first straight flow channels; the ratio of the width of the first straight flow channel to the width of the first flow channel ridge is 1:1 to 2:1; The first flow channel area includes a plurality of second direct flow channels arranged in parallel with each other, wherein the second direct flow channels are arranged in parallel with the first direct flow channels; a second flow channel ridge is arranged between adjacent second direct flow channels; and a ratio of a width of the second direct flow channel to a width of the second flow channel ridge is 1:1 to 2:1; The first transition zone and the second transition zone each include a plurality of rectangular strip blocks arranged perpendicularly to the second direct current channel, and flow channel grooves are arranged between adjacent rectangular strip blocks; The width of the flow channel groove is equal to or similar to the width of the second direct flow channel; the ratio of the length to the width of the rectangular strip block is 3:1 to 1:

1.

9. A sealing structure, characterized in that: The sealing structure comprises the PEM electrolyzer plate according to any one of claims 1 to 8.

10. The sealing structure according to claim 9, characterized in that: The sealing structure includes a first sealing strip, a first PEM electrolyzer plate, a second sealing strip, a membrane electrode, a third sealing strip, a second PEM electrolyzer plate and a fourth sealing strip stacked in sequence; the first sealing strip is arranged in the first sealing groove of the first PEM electrolyzer plate, and the second sealing strip is arranged in the second sealing groove of the first PEM electrolyzer plate; the third sealing strip is arranged in the first sealing groove of the second PEM electrolyzer plate, and the fourth sealing strip is arranged in the second sealing groove of the second PEM electrolyzer plate; the first PEM electrolyzer plate and the second PEM electrolyzer plate are both the PEM electrolyzer plates according to any one of claims 1 to 8.

11. The sealing structure according to claim 10, characterized in that: The first sealing strip and the third sealing strip are both cathode sealing strips; the second sealing strip and the fourth sealing strip are both anode sealing strips; and gaps are provided between the cathode sealing strip and the first sealing groove, and between the anode sealing strip and the second sealing groove.

12. The sealing structure according to claim 10, characterized in that: The angle formed by the side wall of the cathode sealing strip and the bottom of the first sealing groove is greater than or equal to the chamfer angle; the angle formed by the side wall of the anode sealing strip and the bottom of the second sealing groove is greater than or equal to the chamfer angle.

13. The sealing structure according to claim 11, characterized in that: A first double-peak structure is arranged on a side of the cathode sealing strip away from the first sealing groove; a second double-peak structure is arranged on a side of the anode sealing strip away from the second sealing groove.

14. The sealing structure according to claim 13, characterized in that: In each of the first double-peak structures, the ratio of the distance between the two protruding peaks to the width of the first double-peak structure is in the range of 1.5:1 to 1:1, and the ratio of the width to the height of the first double-peak structure is in the range of 10:1 to 5:1; In each of the second double-peak structures, the ratio of the distance between two protruding peaks to the width of the second double-peak structure is in the range of 1.5:1 to 1:1, and the ratio of the width to the height of the second double-peak structure is in the range of 10:1 to 5:1.

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