Electrolytic cell electrode plate and manufacturing process thereof

Abstract

This invention relates to an electrolytic cell electrode plate and its manufacturing process, comprising a metal electrode plate and a first sealing ring; the metal electrode plate defines a mutually perpendicular X-plane and a Y-plane; a flow channel and a first annular sealing groove are respectively provided on two end faces parallel to the X-plane; an oxygen inlet and a water outlet are provided on the first end face, communicating with the flow channel on that end face and along the Y-plane direction, and a hydrogen inlet is provided on the second end face, communicating with the flow channel on that end face and along the Y-plane direction; there are two first sealing rings, respectively adapted to the shape and size of the sealing grooves on the first and second end faces, and integrally vulcanized with the metal electrode plate. This invention employs a structure that integrally vulcanizes the sealing ring and the metal electrode plate with the sealing groove, processing two components that originally required high-precision tight splicing into a single unit, reducing the risk of hydrogen leakage from the electrolytic cell while improving the stacking efficiency of the electrolytic cell and enhancing the service life and performance of the PEM electrolytic cell.

Description

Technical Field

[0001] This invention relates to electrode plates for PEM electrolyzers, and more specifically to electrolyzer electrode plates and their manufacturing process. Background Technology

[0002] Hydrogen energy is a strategic emerging industry and a key development direction for future industries. Proton exchange membrane (PEM) water electrolysis for hydrogen production has been accepted and recognized by the hydrogen energy market due to its advantages such as high efficiency, small size, and good dynamic response. PEM electrolyzers have a layered structure, with up to hundreds of layers. During operation, H+ ions in the water combine with electrons at the cathode side of the proton exchange membrane under the influence of an electric field to produce hydrogen gas. The accumulated hydrogen gas causes an increase in internal pressure. To ensure that hydrogen and pure water do not leak, rubber-plastic gaskets or vulcanized rubber sealing solutions are often used. However, because the sealing line length per unit volume of the electrolyzer is very large, even a small leak can lead to seal failure. Therefore, if the electrolyzer's sealing structure is unreasonable or defective, it will seriously affect the reliability and lifespan of the entire electrolyzer. This places very stringent requirements on the rubber-plastic sealing materials and processes used in electrolyzers.

[0003] The drawback of existing technologies is that, for PEM electrolyzers used in industrial production, the hydrogen pressure inside a single electrolyzer reaches 3 MPa or higher. To address the safety hazard of hydrogen leakage, various sealing component and electrolyzer manufacturers have customized special sealing structures and components for different internal cell structures and environmental conditions. However, existing PEM electrolyzer sealing technologies all use multiple sealing frames and sealing materials to assemble the membrane electrode and the components on both sides. This method not only leads to an excessive number of assembly parts, increased processing costs, and low assembly efficiency, but also poses a risk of hydrogen leakage. Summary of the Invention

[0004] In order to overcome the above-mentioned technical defects, the purpose of this invention is to provide an electrolytic cell electrode plate and its manufacturing process.

[0005] First, the present invention provides an electrolytic cell electrode plate, comprising: a metal electrode plate; the metal electrode plate defining mutually perpendicular X-planes and Y-planes; flow channels and first annular sealing grooves respectively provided on two end faces parallel to the X-plane; an oxygen inlet and a water outlet communicating with the flow channels of the end face and along the Y-plane direction are provided on the first end face, and a hydrogen inlet communicating with the flow channels of the end face and along the Y-plane direction is provided on the second end face; the sealing grooves on the first and second end faces respectively define the flow channels of their respective end faces within the boundaries constrained by the sealing grooves; and two first sealing rings, which are adapted to the shape and size of the sealing grooves on the first and second end faces respectively, and are integrally vulcanized with the metal electrode plate.

[0006] Furthermore, the metal electrode plate is formed by laser welding two metal plates; wherein the outward-facing end face of the first metal plate is the first end face, on which a flow channel, an annular sealing groove, an oxygen water inlet and a water inlet are provided; and the outward-facing end face of the second metal plate is the second end face, on which a flow channel, an annular sealing groove and a hydrogen gas inlet are provided.

[0007] Furthermore, it also includes at least two flow holes; the flow holes are through holes and are respectively disposed on the first metal plate and the second metal plate.

[0008] Furthermore, it also includes connecting posts; the number of flow holes is even, and they are arranged one-to-one on the first metal plate and the second metal plate; the connecting posts are arranged between the corresponding flow holes of the first metal plate and the second metal plate, and the connecting posts fix the sealing rings arranged in the sealing grooves of the first metal plate and the second metal plate.

[0009] Furthermore, the oxygen inlet, water outlet, and hydrogen outlet are all through holes penetrating the first metal plate and the second metal plate; on the first end face of the first metal plate, the oxygen inlet and water outlet are confined within the annular sealing groove by an annular sealing groove, thus isolating them from the hydrogen outlet; on the second end face of the second metal plate, the hydrogen outlet is confined within the annular sealing groove by an annular sealing groove, thus isolating it from the oxygen inlet and water outlet.

[0010] Furthermore, a second annular sealing groove and a second sealing ring are provided; the second annular sealing groove is disposed around the hydrogen port on the first end face of the metal plate and around the oxygen water port and water inlet on the second end face of the metal plate; the second annular sealing groove communicates with the first annular sealing groove; the second sealing ring is disposed within the second annular sealing groove.

[0011] Furthermore, both the first and second sealing rings have at least one raised ring.

[0012] This invention also discloses a manufacturing process for an electrolytic cell electrode plate, comprising the following steps: Prepare metal plates; define mutually perpendicular X and Y planes for the metal plates; define the two end faces parallel to the X plane as the first end face and the second end face, respectively; A flow channel, a first annular sealing groove, and an oxygen inlet and a water outlet are etched along the X-plane direction on the first end face of the metal electrode plate; the flow channel is connected to the oxygen inlet and the water outlet. A flow channel, a first annular sealing groove, and a hydrogen port along the Y plane are etched on the second end face of the metal electrode plate; the flow channel is connected to the hydrogen port. The sealing grooves on the first and second end faces respectively define the flow channels of each end face within the boundary constrained by the sealing grooves; A first sealing ring is provided in the first annular sealing groove on the first end face and the second end face, and the first sealing ring is integrally vulcanized with the metal electrode plate.

[0013] Furthermore, the preparation of the metal electrode plate includes: Prepare two metal plates, with one end face of one metal plate as the first end face and one end face of the other metal plate as the second end face; After etching out the flow channel, the first annular sealing groove, the oxygen water inlet, the water inlet, and the hydrogen gas inlet, the first metal plate and the second metal plate are welded together by laser welding, with the first end face and the second end face facing outwards.

[0014] Furthermore, the first sealing ring is injection molded within the first sealing groove.

[0015] After adopting the above technical solution, compared with the prior art, it has the following beneficial effects: (1) The present invention adopts a structure in which the sealing ring and the metal electrode plate with the sealing groove are integrally vulcanized and formed, and the two parts that originally needed to be tightly spliced ​​with high precision are processed into a whole, which reduces the risk of hydrogen leakage in the electrolyzer, improves the stacking efficiency of the electrolyzer, and enhances the service life and performance of the PEM electrolyzer.

[0016] (2) The metal electrode plate of the present invention adopts double plate double flow channel welding technology, which separates the electrode frame from the electrolytic cell component library, making the structure simpler and clearer, while reducing costs.

[0017] (3) The present invention adopts a single mold double-sided vulcanization process, which saves mold opening costs and molding times, and improves work efficiency.

[0018] (4) The present invention is provided with a connecting post, which is obtained by vulcanization process, thereby achieving a stable effect that the rubber will not fall off even if the glue is not applied properly before injection. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the first metal plate of the present invention before it is vulcanized.

[0021] Figure 3 This is a schematic diagram of the structure of the first metal plate after vulcanization according to the present invention.

[0022] Figure 4 This is a schematic diagram of the uncured structure of the second metal plate of the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of the second metal plate after vulcanization according to the present invention.

[0024] Figure 6 This is a schematic diagram of the protrusion of the first sealing ring and the connecting post formed by it according to the present invention.

[0025] Figure 7 This is a schematic diagram of the structure of the first metal plate and the first sealing ring of the second metal plate of the present invention after vulcanization, which are connected as a whole.

[0026] The attached figures are labeled as follows: First metal plate 1, First end face 1-1, Second metal plate 2, Second end face 2-1, Flow channel 3, First annular sealing groove 4, Oxygen water inlet 5, Water inlet 6, Hydrogen gas inlet 7, First sealing ring 8, First protrusion 8-1, Second annular sealing groove 9, Second sealing ring 10, Connecting post 11, Flow hole 12, Assembly hole 13. Detailed Implementation

[0027] The advantages of the present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments.

[0028] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0029] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0030] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0031] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0033] In the following description, suffixes such as "module," "part," or "unit" used to denote elements are used only for the convenience of the description of the invention and have no specific meaning in themselves. Therefore, "module" and "part" can be used interchangeably.

[0034] like Figure 1 As shown, this embodiment of the invention relates to an electrode plate for an electrolytic cell, specifically a bipolar plate. It includes a metal electrode plate and a first sealing ring.

[0035] Figure 1 In the diagram, the metal plates define mutually perpendicular X and Y planes. The plane in the left-right direction, also known as the horizontal plane, and its parallel planes are called the X plane. The plane perpendicular to it in the up-down direction is called the Y plane. On the two end faces parallel to the X plane, that is... Figure 1 The image shows one end face, with the opposite bottom plane representing the other end face. A flow channel 3 and a first annular sealing groove 4 are respectively provided on these two end faces. On the first end face, an oxygen inlet 5 and a water outlet 6 are provided, communicating with the flow channel and along the Y-plane direction. On the second end face, a hydrogen inlet 7 is provided, communicating with the flow channel and along the Y-plane direction. The sealing grooves on the first and second end faces respectively confine the flow channel of their respective end faces within the boundaries defined by the sealing grooves; that is, the sealing grooves form a ring around the perimeter, while the flow channels are located within the ring formed by the sealing grooves. There are two first sealing rings 8, each adapted to the shape and size of the first annular sealing groove 4 on the first and second end faces, and integrally vulcanized with the metal electrode plate.

[0036] like Figures 1-5As shown, the metal electrode plate is formed by laser welding of two metal plates; the outward end face of the first metal plate 1 is the first end face 1-1, also known as the anode plate, which is provided with a flow channel 3, a first annular sealing groove 4, an oxygen water inlet 5 and a water outlet 6; the outward end face of the second metal plate 2 is the second end face 2-1, also known as the cathode plate, which is provided with a flow channel 3, a first annular sealing groove 5 and a hydrogen gas inlet 7.

[0037] For example, 2- Figure 5 As can be seen, the electrode plate of the electrolytic cell also includes at least two flow holes 12; the flow holes 12 are through holes and are respectively disposed on the first metal plate 1 and the second metal plate 2.

[0038] like Figure 6 As shown, it also includes a connecting post 11; the number of flow holes 12 is even, and they are arranged one-to-one on the first metal plate 1 and the second metal plate 2; the connecting post 11 is arranged between the corresponding flow holes 12 of the first metal plate 1 and the second metal plate 2, and the connecting post 11 fixes the first sealing ring 8 arranged in the first sealing groove 4 of the first metal plate 1 and the second metal plate 2.

[0039] The oxygen inlet 5, water outlet 6, and hydrogen outlet 7 are all through holes penetrating the first metal plate 1 and the second metal plate 2. On the first end face 1-1 of the first metal plate 1 (anode plate), the oxygen inlet 5 and water outlet 6 are confined within the annular sealing groove 4 by a first annular sealing groove, thus isolating them from the hydrogen outlet 7. On the second end face 2-1 of the second metal plate 2 (cathode plate), the hydrogen outlet 7 is confined within the annular sealing groove 4 by an annular sealing groove, thus isolating it from the oxygen inlet 5 and water outlet 6.

[0040] For better isolation, a second annular sealing groove 9 and a second sealing ring 10 are also provided; the second annular sealing groove 9 is provided around the hydrogen port 7 on the first end face 1-1 of the metal plate and around the oxygen water port 5 and the water inlet 6 on the second end face 2-1 of the metal plate; the second annular sealing groove 9 is connected to the first annular sealing groove 4; the second sealing ring 10 is provided inside the second annular sealing groove 9.

[0041] Overall, this design is intended to be more universal and improve processing convenience. That is, the first metal plate 1 and the second metal plate 2 are identical except for the positions of the first sealing groove 4 and the second sealing groove 9. Both have oxygen inlets, water inlets, hydrogen inlets, and flow holes in corresponding positions. Then, depending on whether it is used as an anode plate or a cathode plate, different sealing grooves are used to isolate the different openings from the outside. Sealing grooves are also provided around the through holes outside the sealing grooves to ensure effective isolation and sealing.

[0042] like Figure 6 As shown, the first sealing ring 8 has at least one raised ring 8-1, and the second sealing ring 10 also has raised rings. In this embodiment of the invention, three raised rings are used, which changes the surface seal of the conventional sealing ring into a line seal, thereby enhancing local pressure and improving sealing performance.

[0043] The following details the manufacturing process of an electrolytic cell electrode plate, including the following steps:

[0044] Prepare metal electrode plates; define mutually perpendicular X-planes and Y-planes for the metal electrode plates; define two end faces parallel to the X-plane as the first end face and the second end face, respectively; specifically, prepare two metal plates, clean the metal plates, and use one end face of one metal plate as the first end face and one end face of the other metal plate as the second end face; after etching flow channels, a first annular sealing groove, oxygen inlet, water inlet, and hydrogen inlet on them, weld the first metal plate (anode plate) and the second metal plate (cathode plate) together by laser welding. The laser beam welds along the sealing groove around the metal electrode plates, connecting the anode and cathode plates where the laser passes. The first end face and the second end face are arranged facing outwards and away from each other. The flow channels on the first end face and the second end face are respectively defined within the boundaries constrained by the sealing grooves; a first sealing ring is set in the first annular sealing groove on the first end face and the second end face, and the first sealing ring is integrally vulcanized with the metal electrode plate.

[0045] The aforementioned integrated vulcanization molding process is referred to as a single-mold double-sided vulcanization process in this embodiment of the invention, to distinguish it from the traditional double-mold single-sided vulcanization process. In the traditional bipolar plate injection process, two molds are used—one for the cathode and one for the anode—requiring two injection processes: one for the cathode and one for the anode. In this embodiment, only one mold is used. The metal electrode plate is placed in this mold, and injection is performed on one side (either the cathode or anode side). The adhesive flows through the flow hole 12 to the other side, completing the double-sided injection. After injection, the first and second sealing rings on the cathode and anode sides can connect together, forming a connecting post at the flow hole. Therefore, even without adhesive application inside the metal plate sealing groove for fixation, it will not detach.

[0046] The specific process is explained in detail below:

[0047] S1: Preparation stage: Mix the sealing material with vulcanizing agent, accelerator and other additives to ensure uniform mixing of the rubber compound; apply adhesive to the sealing groove designed on the metal electrode plate (to fix the sealing ring); preheat the mold (with upper mold and lower mold) to the set temperature, and apply release agent evenly to the surface of the mold.

[0048] Depending on the specific needs and application environment, different vulcanization systems can be selected, including sulfur vulcanization systems, peroxide vulcanization systems, sulfur donor vulcanization systems, and oxime and reactive resin vulcanization systems. This embodiment uses a sulfur vulcanization system. Considering factors such as hardness, hydrolysis resistance, acid and alkali resistance, and weather resistance, ethylene propylene diene monomer (EPDM) rubber is selected as the sealing material for the electrolytic cell.

[0049] S11: Rubber compounding; The sealing material is compounded with vulcanizing agents, accelerators, and other additives in a rubber mixing mill to ensure uniform mixing. Considering factors such as hardness, hydrolysis resistance, acid and alkali resistance, and weather resistance, ethylene propylene diene monomer (EPDM) rubber is selected as the sealing material for the electrolytic cell.

[0050] The formula is as follows: EPDM rubber: 100; zinc oxide: 5; stearic acid: 1; sulfur: 0.5; high abrasion-resistant carbon black: 70; accelerator TT: 1.5; accelerator DM: 2;

[0051] Mixing process: Raw rubber roll wrapping—1 / 2 carbon black—1 / 2 carbon black—stearic acid—zinc oxide—accelerator—crosslinking agent (sulfur)—thin pass, sheeting. This sequence facilitates the uniform dispersion of compounding agents and improves the performance of the final product. In the mixing process of vulcanizing agents and vulcanization accelerators, the mixing temperature is typically below 100℃, preferably room temperature to 80℃. The mixing time is typically 30 seconds to 30 minutes, preferably 1 minute to 30 minutes.

[0052] S12: Rubber Reprocessing; Reprocessing is performed in a rubber mixing mill. Reprocessing refers to the process of reprocessing the rubber compound after it has been left to stand for a period of time, before use. The main purpose of reprocessing is to further disperse the additives evenly in the rubber compound, make the compound softer for molding operations, improve the flowability and self-adhesion of the compound, thereby optimizing the molding process and handling performance. The temperature is set at 50-80℃, preferably around 60℃, to avoid the adverse effects of excessively high temperatures on rubber quality; the time is 20 minutes.

[0053] S13: Rubber cutting; The refined rubber is cut into small pieces using a rubber cutting machine. To ensure the consistency of the small pieces, a weighing method is used to meet the needs of the vulcanization process.

[0054] S14: Preparation before vulcanization; apply adhesive to the designed sealing groove on the metal electrode plate (to fix the sealing ring); preheat the mold (with upper mold and lower mold) to the set temperature, and apply release agent evenly to the surface of the mold.

[0055] S2: Injection Stage: Inject adhesive into the mold cavity of the upper mold. The adhesive flows into the pre-designed sealing groove on the metal electrode plate, and then flows through the flow holes in the sealing groove into the lower mold and the texture of the metal electrode plate on the other side. The injection time and injection pressure are set according to the product, equipment, and mold.

[0056] S3: Vulcanization Stage: The vulcanization temperature is typically set between 150℃ and 180℃, and the vulcanization time is set according to specific product requirements, generally ranging from 90 minutes to several hours. The vulcanization pressure is set according to the size of the rubber part, typically between 0.4MPa and 15MPa. Constant pressure and temperature must be maintained during the vulcanization process, controlled by the hydraulic and heating systems of the vulcanizing machine.

[0057] In this embodiment, a flat vulcanizing machine is used to vulcanize and mold small pieces of rubber. The rubber material is placed into the mold cavity of the upper mold, and after being heated, it flows into the sealed groove designed on the metal electrode plate. It then flows through the flow holes in the sealed groove into the lower mold and the texture of the metal electrode plate on the other side. The injection time and injection pressure are set according to the product, equipment, and mold.

[0058] Using a sulfur vulcanization system, the vulcanization time may be around 10-15 minutes.

[0059] S4: Post-vulcanization treatment: After vulcanization, the mold needs to be vented and then fully cooled before demolding. Connecting pillars are formed within the flow holes of the metal electrode plate, fixing the sealing rings on both sides of the electrode plate together. Even if the glue is not applied properly before injection, the rubber will not fall off.

[0060] It should be noted that the embodiments of the present invention have better implementability and are not intended to limit the present invention in any way. Any person skilled in the art may use the above-disclosed technical content to change or modify it into equivalent effective embodiments. However, any modifications or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. An electrode plate for an electrolytic cell, comprising: Metal electrode plates; The metal plates define mutually perpendicular X and Y planes; A flow channel and a first annular sealing groove are respectively provided on two end faces parallel to the X plane; an oxygen water inlet and a water outlet are provided on the first end face, which are connected to the flow channel of the end face and are along the Y plane direction; a hydrogen gas inlet is provided on the second end face, which is connected to the flow channel of the end face and is along the Y plane direction; the sealing grooves on the first and second end faces respectively limit the flow channel of their respective end faces within the boundary constrained by the sealing groove. The first sealing ring; there are two first sealing rings, which are adapted to the shape and size of the sealing grooves on the first end face and the second end face respectively, and are integrally vulcanized with the metal electrode plate.

2. The electrolytic cell electrode plate according to claim 1, further comprising: The metal electrode plate is formed by laser welding two metal plates; the outward end face of the first metal plate is the first end face, on which a flow channel, an annular sealing groove, an oxygen water inlet and a water inlet are provided; the outward end face of the second metal plate is the second end face, on which a flow channel, an annular sealing groove and a hydrogen gas inlet are provided.

3. The electrolytic cell electrode plate according to claim 2 further includes: At least two flow holes; The flow holes are through holes and are respectively disposed on the first metal plate and the second metal plate.

4. The electrolytic cell electrode plate according to claim 3 further includes: Connecting column; The number of flow holes is even, and they are arranged one-to-one on the first metal plate and the second metal plate; the connecting post is arranged between the corresponding flow holes of the first metal plate and the second metal plate, and the connecting post fixes the sealing ring arranged in the sealing groove of the first metal plate and the second metal plate.

5. The electrolytic cell electrode plate according to claim 4, further comprising: The oxygen inlet, water outlet, and hydrogen outlet are all through holes penetrating the first and second metal plates. On the first end face of the first metal plate, the oxygen inlet and water outlet are confined within the annular sealing groove and isolated from the hydrogen outlet. On the second end face of the second metal plate, the hydrogen outlet is confined within the annular sealing groove and isolated from the oxygen inlet and water outlet.

6. The electrolytic cell electrode plate according to claim 5, further comprising: The second annular sealing groove and the second sealing ring; the second annular sealing groove is disposed around the hydrogen port on the first end face of the metal plate and around the oxygen port and water inlet on the second end face of the metal plate; the second annular sealing groove is connected to the first annular sealing groove; the second sealing ring is disposed inside the second annular sealing groove.

7. The electrolytic cell electrode plate according to claim 6, further comprising: The first sealing ring and the second sealing ring are provided with at least one ring of protrusion.

8. A manufacturing process for an electrolytic cell electrode plate, comprising the following steps: Prepare metal plates; define mutually perpendicular X and Y planes for the metal plates; where, Define the two end faces parallel to the X-plane as the first end face and the second end face, respectively. A flow channel, a first annular sealing groove, and an oxygen inlet and a water outlet are etched along the X-plane direction on the first end face of the metal electrode plate; the flow channel is connected to the oxygen inlet and the water outlet. A flow channel, a first annular sealing groove, and a hydrogen port along the Y plane are etched on the second end face of the metal electrode plate; the flow channel is connected to the hydrogen port. The sealing grooves on the first and second end faces respectively define the flow channels of each end face within the boundary constrained by the sealing grooves; A first sealing ring is provided in the first annular sealing groove on the first end face and the second end face, and the first sealing ring is integrally vulcanized with the metal electrode plate.

9. The manufacturing process of the electrolytic cell electrode plate according to claim 8 further includes: The preparation of the metal electrode plate includes: Prepare two metal plates. Take one of the metal plates as the first metal plate and one end face of it as the first end face. Take the other metal plate as the second metal plate and one end face of it as the second end face. After etching out the flow channel, the first annular sealing groove, the oxygen water inlet, the water inlet, and the hydrogen gas inlet, the first metal plate and the second metal plate are welded together by laser welding, with the first end face and the second end face facing outwards.

10. The manufacturing process of the electrolytic cell electrode plate according to any one of claims 8 or 9 further includes: The first sealing ring is formed by injection molding within the first sealing groove.

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