Electrode plate and water electrolysis hydrogen production device

Abstract

The application provides an electrode plate and a water electrolysis hydrogen production device. The electrode plate comprises an electrode plate body, at least one side surface of the electrode plate body is provided with a flow field area, the flow field area comprises adjacent first and second flow field areas; in the second flow field area, the electrode plate body is provided with a flow-through hole; a first groove is formed in the first flow field area, a second groove is formed in the second flow field area, the second groove is communicated with the first groove and the flow-through hole, and the depth of the second groove is greater than that of the first groove. By designing the depth of the second groove to be greater than that of the first groove, the volume of the second groove can be increased, so that the second groove can buffer the fluid, the risk of fluid accumulation at the flow-through hole is reduced, and the fluid can flow into or out of the flow field area better.

Description

Technical Field

[0001] This application relates to the field of hydrogen production technology through water electrolysis, specifically to an electrode plate and a device for hydrogen production through water electrolysis. Background Technology

[0002] Electrolysis of water to produce hydrogen is a novel technology with great development potential. The electrolyzer is the core equipment in this technology, and the electrode plate is an important component. It is used not only for conducting electricity and supporting the electrodes and diaphragm, but also for guiding the flow of fluids (gas or liquid).

[0003] Related technologies involve slotting grooves in the electrode plate to form channels in the flow field, with through-holes on the electrode plate communicating with the channels, allowing fluid to flow into or out of the flow field through the through-holes. However, in this method, fluid tends to accumulate at the through-holes, affecting fluid flow. Utility Model Content

[0004] The embodiments of this application provide an electrode plate and an electrolytic water hydrogen production device, which can improve the technical problem that fluid tends to accumulate at the flow holes on the electrode plate.

[0005] In a first aspect, embodiments of this application provide an electrode plate, including an electrode plate body. At least one side surface of the electrode plate body is provided with a flow field region, the flow field region including an adjacent first flow field region and a second flow field region. In the second flow field region, the electrode plate body is provided with a through-hole. A first groove is formed in the first flow field region, and a second groove is formed in the second flow field region. The second groove connects the first groove and the through-hole, and the depth of the second groove is greater than the depth of the first groove.

[0006] By designing the depth of the second groove to be greater than that of the first groove, the volume of the second groove can be increased, thereby allowing the second groove to buffer the fluid, reducing the risk of fluid accumulation at the flow orifice, and enabling the fluid to flow into or out of the flow field region more effectively.

[0007] In one embodiment, the depth of the second trench is 0.2 mm to 0.3 mm greater than the depth of the first trench.

[0008] Within the aforementioned depth difference range, the fluid can flow rapidly between the first groove, the second groove, and the flow hole, and is not prone to local accumulation.

[0009] In one embodiment, along the direction from the first flow field region to the flow hole, the second trench includes a plurality of sub-slot segments that are sequentially connected and have decreasing widths.

[0010] With this configuration, when the fluid flows from the first groove to the flow hole, the second groove can also act as a guide, accelerating the flow of the fluid to the flow hole. Conversely, when the fluid flows from the flow hole to the first groove, the second groove can act as a diversion.

[0011] In one embodiment, the plurality of sub-slot segments include a first sub-slot segment, a second sub-slot segment, and a third sub-slot segment. The first sub-slot segment has a plurality of strip-shaped protrusions spaced apart, which divide the first sub-slot segment into a plurality of sub-slots. The sub-slots intersect and communicate with the first groove. The second sub-slot segment and the third sub-slot segment both have columnar protrusions, and the number of columnar protrusions in the second sub-slot segment is greater than the number of columnar protrusions in the third sub-slot segment.

[0012] By setting strip-shaped protrusions and columnar protrusions in the second groove, the fluid can be distributed more evenly through their combination.

[0013] In one embodiment, the orthographic projection of the columnar protrusion in its height direction is circular, elliptical, or racetrack-shaped.

[0014] The peripheral surface of the columnar protrusions of the above shape is at least partially arc-shaped, and these arc-shaped surfaces can also serve to guide the flow and reduce interference with the direction of fluid flow.

[0015] In one embodiment, the strip-shaped protrusion includes a strip-shaped extending body portion and a plurality of protrusion portions protruding from the surface of the body portion and spaced apart, a groove portion is defined between two adjacent protrusion portions, the groove portion is disposed corresponding to the first groove, and the extending direction of the groove portion is consistent with the extending direction of the first groove.

[0016] With this configuration, the extension direction of the groove is different from that of the sub-groove, so that the fluid can flow in different directions within the first sub-groove section, forming multiple flow paths and reducing the risk of forming dead flow zones.

[0017] In one embodiment, the first trench extends in a meandering manner within the first flow field region.

[0018] This extends the flow path of the fluid within the flow field region, allowing the reactants in the fluid to react effectively on the electrodes, while simultaneously collecting more reaction products.

[0019] In one embodiment, the number of the first trenches is multiple.

[0020] Increasing the number of first grooves can significantly optimize the uniformity of fluid distribution within the flow field region.

[0021] In one embodiment, there is one first flow field region and two second flow field regions. The two second flow field regions are distributed at intervals on opposite sides of the first flow field region. The flow hole in one of the second flow field regions is an inlet, and the flow hole in the other second flow field region is an outlet.

[0022] In this way, the fluid carries the reactants into the flow field region from the inlet, and then the fluid carries the reaction products out of the flow field region from the outlet.

[0023] In one embodiment, the electrode body further forms a first sealing groove surrounding the flow field region, and the electrode further includes a first sealing element disposed within the first sealing groove.

[0024] The first seal is used to seal the flow field region, which optimizes the fluid flow path, reduces flow resistance, and improves efficiency. Especially when the product is hydrogen, it can also reduce oxygen infiltration and improve safety.

[0025] In one embodiment, the number of the first sealing grooves is 1 to 4.

[0026] In one embodiment, the width of the first sealing groove is 1.8 mm to 2.2 mm.

[0027] In one embodiment, the depth of the first sealing groove is 0.3 mm to 0.4 mm.

[0028] The above settings can improve the sealing reliability of the convection field area.

[0029] In one embodiment, the electrode plate is a bipolar plate, and the flow field region is provided on both opposite surfaces of the electrode plate body; the flow hole located in the flow field region on one side surface is located outside the flow field region on the other side surface; outside the flow field region, a second sealing groove is also formed on the surface of the electrode plate body surrounding the flow hole, and the electrode plate further includes a second sealing member disposed in the second sealing groove.

[0030] The combination of the first and second seals can effectively isolate different flow holes located in different flow field regions, effectively reducing the risk of explosion caused by the mixing of oxygen and hydrogen.

[0031] In one embodiment, the electrode body includes a substrate and a nickel layer, the nickel layer covering the surface of the substrate; the substrate is at least one of carbon steel plate and stainless steel plate, and the thickness of a single nickel layer is greater than or equal to 25 μm.

[0032] This configuration can improve the alkali corrosion resistance of the electrode plates.

[0033] Secondly, embodiments of this application provide an electrolytic water hydrogen production apparatus, including the aforementioned electrode plates. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a three-dimensional structural diagram of the electrode plate provided in an embodiment of this application from one viewpoint;

[0036] Figure 2 yes Figure 1 Enlarged view of section A;

[0037] Figure 3 This is a schematic diagram of the main structure of the electrode plate provided in an embodiment of this application;

[0038] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure along the BB direction;

[0039] Figure 5 yes Figure 4 Enlarged view of section C;

[0040] Figure 6 yes Figure 4 Enlarged view of section D;

[0041] Figure 7 This is a three-dimensional structural diagram of the electrode plate provided in an embodiment of this application from another perspective.

[0042] Explanation of reference numerals in the attached figures:

[0043] 10. Electrode plate; 1. Electrode plate body; 11. Flow field region; 111. First flow field region; 112. Second flow field region; 12. Flow hole; 13. First groove; 14. Second groove; 141. First sub-groove segment; 1411. Sub-groove; 142. Second sub-groove segment; 143. Third sub-groove segment; 15. Strip-shaped protrusion; 151. Body part; 152. Protrusion part; 153. Groove part; 16. Columnar protrusion; 17. First sealing groove; 18. Second sealing groove. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operation, specifically the directions shown in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0046] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] In the description of the embodiments of this application, the words "example" or "for example" are used to indicate exemplification, illustration, or description. Any embodiment or design described as "example" or "for example" in the embodiments of this application is not to be construed as being more preferred or having more advantages than another embodiment or design. The use of the words "example" or "for example" is intended to present relative concepts in a clear manner.

[0050] To facilitate understanding of the present application, the spline curves and arrows used in the reference numerals in the accompanying drawings are explained below: spline curves without arrows indicate solid parts, that is, parts with solid structures; spline curves with arrows indicate virtual parts, that is, parts without solid structures.

[0051] Hydrogen production through water electrolysis is a green hydrogen production technology that uses electricity to decompose water molecules into hydrogen (H2) and oxygen (O2). Common types of water electrolysis hydrogen production technologies include alkaline water electrolysis (AWE), proton exchange membrane water electrolysis (PEM), and anion exchange membrane water electrolysis (AEM).

[0052] The core equipment for hydrogen production through water electrolysis is the electrolyzer. The electrolyzer mainly consists of a cathode, an anode, and a diaphragm, with the diaphragm located between the cathode and anode. The type of diaphragm varies depending on the type of electrolyzer. When the electrolyzer is alkaline, the diaphragm is a porous membrane that allows OH- to pass through. - Ions pass through; when the electrolyzer is a proton exchange membrane (PEM) electrolyzer, the diaphragm is a proton exchange membrane, allowing H+ to pass through. + Ions pass through; when the electrolyzer is an anion exchange membrane (AEM) electrolyzer, the diaphragm is an anion exchange membrane, allowing OH- to pass through. - Ions pass through. It should also be noted that the electrolytic cell can be a unipolar electrolytic cell or a bipolar electrolytic cell.

[0053] In an electrolyzer, the oxygen evolution reaction (OER) typically occurs at the anode, while the hydrogen evolution reaction (HER) occurs at the cathode.

[0054] In addition to the electrodes, the electrolytic cell also includes electrode plates located on one side of the electrodes (including the cathode and anode). On one hand, the electrode plates conduct electrons, ensuring a uniform distribution of current within the electrolytic cell; on the other hand, they support the electrodes and diaphragm, ensuring the stability and integrity of the electrolytic cell structure. Furthermore, the electrode plates also guide the flow of fluids (gas or liquid) within the electrolytic cell.

[0055] Related technologies involve slotting grooves in the electrode plate to form channels in the flow field, with through-holes on the electrode plate communicating with the channels, allowing fluid to flow into or out of the flow field through the through-holes. However, in this method, fluid tends to accumulate at the through-holes, affecting fluid flow.

[0056] For this, please see Figures 1 to 7Some embodiments of this application provide an electrode plate 10, which includes an electrode plate body 1. At least one side surface of the electrode plate body 1 is provided with a flow field region 11. The flow field region 11 includes an adjacent first flow field region 111 and a second flow field region 112. In the second flow field region 112, the electrode plate body 1 is provided with a through-flow hole 12. A first groove 13 is formed in the first flow field region 111, and a second groove 14 is formed in the second flow field region 112. The second groove 14 connects the first groove 13 and the through-flow hole 12, and the depth of the second groove 14 is greater than the depth of the first groove 13.

[0057] The electrode plate 10 can be any one of an anode plate, a cathode plate, and a bipolar plate.

[0058] The electrode 10 includes an electrode body 1, which has two opposing surfaces in its thickness direction, namely a first surface and a second surface. At least one surface of the electrode body 1 is provided with a flow field region 11; for example, the first surface may have a flow field region 11, the second surface may have a flow field region 11, or both the first and second surfaces may have a flow field region 11. When both the first and second surfaces have a flow field region 11, the electrode 10 is a bipolar plate, with one of the first and second surfaces being the anode surface and the other the cathode surface.

[0059] Furthermore, the flow field region 11 includes a first flow field region 111 and a second flow field region 112. The first flow field region 111 and the second flow field region 112 are adjacent to and connected. Optionally, the area of ​​the first flow field region 111 is larger than the area of ​​the second flow field region 112. A first groove 13 is formed in the first flow field region 111, and a second groove 14 is formed in the second flow field region 112. Both the first groove 13 and the second groove 14 are flow channels for fluid flow. In the electrolytic cell, the fluid includes at least one of a gas and a liquid, where the gas is oxygen or hydrogen, and the liquid is water, such as an alkaline aqueous solution (i.e., alkali solution).

[0060] The electrode body 1 is also provided with a flow passage 12, which is located within the second flow field region 112. Here, the flow passage 12 can be an inlet, through which fluid flows into the flow field region 112; or it can be an outlet, through which fluid flows out of the flow field region 112. For example, if the flow passage 12 is an outlet, oxygen generated at the anode or hydrogen evolved at the cathode can be discharged through it; or if the flow passage 12 is an inlet, reactant water can flow into the flow field region 11 through it. The second groove 14 connects the first groove 13 and the flow passage 12, meaning that the first groove 13, the second groove 14, and the flow passage 12 are sequentially connected. Thus, fluid can flow from the first groove 13 through the second groove 14 to the flow passage 12, or fluid can flow from the flow passage 12 through the second groove 14 to the first groove 13.

[0061] The depth of the second groove 14 is greater than the depth of the first groove 13. As an example, see 6, in the thickness direction of the electrode body 1, the bottom surface of the second groove 14 is lower than the bottom surface of the first groove 13.

[0062] By designing the depth of the second groove 14 to be greater than the depth of the first groove 13, the volume of the second groove 14 can be increased, thereby allowing the second groove 14 to buffer the fluid, reducing the risk of fluid accumulation at the flow hole 12, and allowing the fluid to flow into or out of the flow field region 11 more effectively.

[0063] For some embodiments of this application, please refer to Figure 6 The depth of the second groove 14 is 0.2 mm to 0.3 mm greater than the depth of the first groove 13. That is, the depth difference between the second groove 14 and the first groove 13 is 0.2 mm to 0.3 mm, for example, it can be any one or any two of 0.20 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm, and 0.30 mm. Within the above depth difference range, fluid can flow rapidly between the first groove 13, the second groove 14, and the flow hole 12, and local accumulation is not easily prevented.

[0064] For some embodiments of this application, please refer to Figure 2 Along the direction from the first flow field region 111 to the flow hole 12, the second groove 14 includes multiple sub-groove segments that are connected in sequence and whose width decreases. With this arrangement, when the fluid flows from the first groove 13 to the flow hole 12, the second groove 14 can also play a guiding role, accelerating the flow of fluid to the flow hole 12, while when the fluid flows from the flow hole 12 to the first groove 13, the second groove 14 can play a diversion role.

[0065] For some embodiments of this application, please refer to Figure 2 The multiple sub-slots include a first sub-slot 141, a second sub-slot 142, and a third sub-slot 143. The first sub-slot 141 is provided with multiple strip-shaped protrusions 15 at intervals, which divide the first sub-slot 141 into multiple sub-slots 1411. The sub-slots 1411 intersect and communicate with the first groove 13. The second sub-slot 142 and the third sub-slot 143 are both provided with columnar protrusions 16. The number of columnar protrusions 16 in the second sub-slot 142 is greater than the number of columnar protrusions 16 in the third sub-slot 143.

[0066] Sub-groove 1411 intersects with first groove 13, meaning the extension direction of first groove 13 is different from the extension direction of sub-groove 1411. As an example, there are 6 first grooves 13, and the extension direction of first groove 13 is perpendicular to the extension direction of sub-groove 1411. One sub-groove 1411 is connected to two first grooves 13.

[0067] By providing strip-shaped protrusions 15 and columnar protrusions 16 within the second groove 14, the fluid can be distributed more evenly through their cooperation.

[0068] For some embodiments of this application, please refer to Figure 2 The columnar protrusion 16 has a circular, elliptical, or racetrack-shaped orthographic projection in its height direction. The peripheral surface of the columnar protrusion 16 with the above-mentioned shape is at least partially arc-shaped, and these arc-shaped surfaces can also play a role in guiding flow and reducing interference with the direction of fluid flow.

[0069] For some embodiments of this application, please refer to Figure 2 The strip protrusion 15 includes a strip-shaped extended body portion 151 and a plurality of protrusion portions 152 that are protruded from the surface of the body portion 151 and spaced apart. A groove portion 153 is defined between two adjacent protrusion portions 152. The groove portion 153 is provided corresponding to the first groove 13, and the extending direction of the groove portion 153 is consistent with the extending direction of the first groove 13.

[0070] In this case, the extension direction of the groove 153 is the same as the extension direction of the first groove 13, while the extension direction of the first groove 13 is different from the extension direction of the sub-groove 1411. That is, the extension direction of the groove 153 is different from the extension direction of the sub-groove 1411, so the fluid can flow in different directions in the first sub-groove section 141, forming multiple flow paths and reducing the risk of forming dead flow zones.

[0071] For some embodiments of this application, please refer to Figures 1 to 3 The first groove 13 extends meanderingly within the first flow field region 111.

[0072] This extends the flow path of the fluid within the flow field region 11, allowing the reactants in the fluid to react effectively on the electrodes, while simultaneously collecting more reaction products.

[0073] As an example, the first trench 13 extends in a serpentine or annular shape within the first flow field region 111, i.e., the first trench 13 is formed as a serpentine flow channel. This can satisfy the single-sided circulation working mode of the electrolyzer and provide a higher differential pressure capability on both sides of the anode and cathode of the electrolyzer, enabling the hydrogen outlet to reach a higher pressure.

[0074] As an example, the first groove 13 extends in a ring within the first flow field region 111, that is, the first groove 13 forms a ring-shaped flow channel.

[0075] For some embodiments of this application, please refer to Figures 1 to 3 The number of the first groove 13 is multiple.

[0076] Increasing the number of first grooves 13 can significantly optimize the uniformity of fluid distribution within the flow field region 11. As an example, the number of first grooves 13 can be 2, 3, 4, 5, 6, 7, 8, 9, or 10.

[0077] For some embodiments of this application, please refer to Figures 1 to 3 There is one first flow field region 111 and two second flow field regions 112. The two second flow field regions 112 are distributed at intervals on opposite sides of the first flow field region 111. The flow hole 12 in one of the second flow field regions 112 is the inlet, and the flow hole 12 in the other second flow field region 112 is the outlet.

[0078] Taking plate 10 as the anode plate as an example, water flows into the flow field zone 11 through the inlet orifice 12, and then flows in the flow field zone 11. The water undergoes an oxidation reaction on the anode to produce oxygen. The oxygen enters the flow field zone 11 and is discharged from the flow field zone 11 together with the unreacted water through the outlet orifice 12.

[0079] Thus, the fluid carries the reactants into the flow field zone 11 from the inlet, and then the fluid carries the reaction products out of the flow field zone 11 from the outlet.

[0080] For some embodiments of this application, please refer to Figures 3 to 5 The electrode body 1 also forms a first sealing groove 17 surrounding the flow field region 11, and the electrode 10 also includes a first sealing element (not shown in the figure), which is disposed in the first sealing groove 17.

[0081] The first seal is used to seal the flow field region 11, which optimizes the fluid flow path, reduces flow resistance, and improves efficiency. Especially when the product is hydrogen, it can also reduce oxygen infiltration and improve safety.

[0082] For some embodiments of this application, please refer to Figures 3 to 5 The number of first sealing grooves 17 is 1 to 4. As an example, the number of first sealing grooves 17 is 1, 2, 3 or 4.

[0083] In some embodiments of this application, the width of the first sealing groove 17 is 1.8 mm to 2.2 mm. As an example, the width of the first sealing groove 17 is any one or any two of 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, and 2.2 mm.

[0084] In some embodiments of this application, the depth of the first sealing groove 17 is 0.3 mm to 0.4 mm. As an example, the depth of the first sealing groove 17 is any one or a range between any two of 0.30 mm, 0.31 mm, 0.32 mm, 0.33 mm, 0.34 mm, 0.35 mm, 0.36 mm, 0.37 mm, 0.38 mm, 0.39 mm, and 0.4 mm.

[0085] The above settings can improve the sealing reliability of the convection field area.

[0086] For some embodiments of this application, please refer to Figures 3 to 5 The electrode plate 10 is a bipolar plate, and flow field regions 11 are provided on both opposite sides of the electrode plate body 1. The flow hole 12 located in the flow field region 11 on one side surface is located outside the flow field region 11 on the other side surface. Outside the flow field region 11, a second sealing groove 18 is also formed on the surface of the electrode plate body 1, which surrounds the flow hole 12. The electrode plate 10 also includes a second sealing element (not shown in the figure), which is disposed in the second sealing groove 18.

[0087] As an example, the flow field region 11 formed on the first surface of the electrode body 1 is the first flow field region, and the flow field region 11 formed on the second surface is the second flow field region. The flow passage 12 formed on the electrode body 1, located in the first flow field region, is the first flow passage, and the flow passage 12 located in the second flow field region is the second flow passage. The first flow passage is located outside the second flow field region, and the second flow passage is located outside the first flow field region. For bipolar plates, typically one of the first and second flow passages is used to discharge oxygen, and the other is used to discharge hydrogen. The cooperation of the first and second seals can effectively isolate the different flow passages 12 located in different flow field regions 11, effectively reducing the risk of explosion caused by the mixing of oxygen and hydrogen.

[0088] In some embodiments of this application, the electrode body 1 includes a substrate and a nickel layer, with the nickel layer covering the surface of the substrate; the substrate is at least one of carbon steel plate and stainless steel plate, and the thickness of a single nickel layer is greater than or equal to 25 μm.

[0089] A nickel layer covers the surface of the substrate, and the substrate is encased in the nickel layer. The main material of the nickel layer is nickel metal, which has good corrosion resistance, especially in alkaline environments where it can exist relatively stably. This improves the alkaline corrosion resistance of the electrode plate 10, making the electrode plate 10 suitable for alkaline electrolytic cells.

[0090] The substrate is at least one of carbon steel plate and stainless steel plate. Carbon steel plate and stainless steel plate have good mechanical strength and strong corrosion resistance, which can further improve the performance of the electrode plate body 1.

[0091] It is understood that the thicker the nickel layer, the better the corrosion resistance of the electrode 10. Specifically, the thickness of a single nickel layer is greater than or equal to 25 μm, which allows the electrode 10 to meet the ISO class 0 and blue point test requirements using the cross-cut adhesion method. Optionally, the nickel layer is a plating layer, meaning that the nickel layer is grown on the surface of the substrate by plating. As an example, the nickel layer is an electroplated layer or a chemical plating layer.

[0092] In some embodiments of this application, the preparation method of the electrode plate 10 includes:

[0093] S1. Provide metal sheets;

[0094] S2. Coat the front and back sides of the metal plate with photoresist to form a photosensitive film;

[0095] S3. Expose the photosensitive film using a photomask;

[0096] S4. Develop the photosensitive film using a developing solution to obtain a patterned photosensitive film;

[0097] S5. Use an etching solution to etch the metal portion of the metal sheet exposed outside the photosensitive film to form an etched pattern;

[0098] S6. Remove the photosensitive film to obtain electrode plate 10.

[0099] In some embodiments of this application, the metal sheet is made of an alkali-resistant material. For example, the metal sheet includes at least one of stainless steel, nickel, titanium, nickel-plated carbon steel, and nickel-plated stainless steel.

[0100] In some embodiments of this application, S1 further includes pretreatment of the metal sheet. Pretreatment includes cleaning and degreasing: using an alkaline degreasing agent to remove oil stains from the surface of the metal sheet, and acid pickling (such as dilute sulfuric acid) to remove the oxide layer, ensuring photoresist adhesion. Pretreatment also includes drying to remove moisture and reduce its impact on subsequent coating.

[0101] In some embodiments of this application, the etching solution in S5 is a mixture of nitric acid (HNO3) and hydrochloric acid (HCl), and optionally, the volume ratio of nitric acid to hydrochloric acid is 3:1.

[0102] In some embodiments of this application, the etching rate in S5 is 0.05 mm / min to 0.1 mm / min. As an example, the etching rate is any one or any two of 0.05 mm / min, 0.06 mm / min, 0.07 mm / min, 0.08 mm / min, 0.09 mm / min, and 0.1 mm / min.

[0103] Secondly, some embodiments of this application also provide an electrolytic water hydrogen production device, which includes the aforementioned electrode plate 10.

[0104] In some embodiments of this application, the water electrolysis hydrogen production device includes an electrolyzer, which includes the aforementioned electrode plate 10.

[0105] In some embodiments of this application, the electrolytic cell further includes a gas diffusion layer disposed between the electrode plate 10 and the electrode.

[0106] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An electrode plate (10), characterized in that, The device includes an electrode body (1), and at least one side surface of the electrode body (1) is provided with a flow field region (11), the flow field region (11) including an adjacent first flow field region (111) and a second flow field region (112); in the second flow field region (112), the electrode body (1) is provided with a through-hole (12); a first groove (13) is formed in the first flow field region (111), and a second groove (14) is formed in the second flow field region (112), the second groove (14) connects the first groove (13) and the through-hole (12), and the depth of the second groove (14) is greater than the depth of the first groove (13).

2. The electrode plate (10) according to claim 1, characterized in that, The depth of the second groove (14) is 0.2 mm to 0.3 mm greater than the depth of the first groove (13).

3. The electrode plate (10) according to claim 1, characterized in that, Along the direction from the first flow field region (111) to the flow hole (12), the second groove (14) includes a plurality of sub-groove segments that are connected in sequence and have decreasing widths.

4. The electrode plate (10) according to claim 3, characterized in that, The plurality of sub-slots include a first sub-slot (141), a second sub-slot (142), and a third sub-slot (143). The first sub-slot (141) is provided with a plurality of strip-shaped protrusions (15) at intervals. The strip-shaped protrusions (15) divide the first sub-slot (141) into a plurality of sub-slots (1411). The sub-slots (1411) intersect and communicate with the first groove (13). The second sub-slot (142) and the third sub-slot (143) are both provided with columnar protrusions (16). The number of columnar protrusions (16) in the second sub-slot (142) is greater than the number of columnar protrusions (16) in the third sub-slot (143).

5. The electrode plate (10) according to claim 4, characterized in that, The columnar protrusion (16) has a circular, elliptical, or racetrack-shaped orthographic projection in its height direction; and / or, the strip protrusion (15) includes a strip-extending body portion (151) and a plurality of protrusions (152) protruding from the surface of the body portion (151) and spaced apart, with a groove portion (153) defined between two adjacent protrusions (152), the groove portion (153) being provided corresponding to the first groove (13), and the extending direction of the groove portion (153) being consistent with the extending direction of the first groove (13).

6. The electrode plate (10) according to any one of claims 1 to 5, characterized in that, The first groove (13) extends meanderingly within the first flow field region (111); and / or, The number of the first grooves (13) is multiple; and / or, There is one first flow field region (111) and two second flow field regions (112). The two second flow field regions (112) are distributed at intervals on opposite sides of the first flow field region (111). The flow hole (12) in one of the second flow field regions (112) is the inlet, and the flow hole (12) in the other second flow field region (112) is the outlet.

7. The electrode plate (10) according to any one of claims 1 to 5, characterized in that, The electrode body (1) also forms a first sealing groove (17) surrounding the flow field region (11), and the electrode (10) also includes a first sealing element, which is disposed in the first sealing groove (17).

8. The electrode plate (10) according to claim 7, characterized in that, The number of the first sealing grooves (17) is 1 to 4; and / or the width of the first sealing groove (17) is 1.8 mm to 2.2 mm; and / or the depth of the first sealing groove (17) is 0.3 mm to 0.4 mm.

9. The electrode plate (10) according to any one of claims 1 to 5, characterized in that, The electrode plate (10) is a bipolar plate, and the flow field region (11) is provided on both opposite surfaces of the electrode plate body (1); the flow hole (12) located in the flow field region (11) on one side surface is located outside the flow field region (11) on the other side surface; outside the flow field region (11), a second sealing groove (18) is also formed on the surface of the electrode plate body (1) surrounding the flow hole (12), and the electrode plate (10) also includes a second sealing element, which is disposed in the second sealing groove (18); and / or, The electrode body (1) includes a substrate and a nickel layer, the nickel layer covering the surface of the substrate; the substrate is at least one of carbon steel plate and stainless steel plate, and the thickness of a single nickel layer is greater than or equal to 25 μm.

10. A device for producing hydrogen through water electrolysis, characterized in that, Includes the electrode plate (10) as described in any one of claims 1 to 9.

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