Electrolysis assembly and electrolysis hydrogen production plant

Abstract

This application discloses an electrolysis assembly and an electrolysis hydrogen production device, relating to the field of new energy equipment technology. The electrolysis assembly includes a membrane electrode assembly (MEA), a bipolar plate, and a sealing structure. The MEA includes a MEA body and a frame, with the frame surrounding the MEA body. A first groove is provided on the surface of the frame, surrounding the MEA body. The bipolar plate is stacked with the MEA, and a second groove is provided on the surface of the bipolar plate facing the MEA, communicating with the first groove. The sealing structure is disposed within the first and second grooves and connected to the inner walls of both grooves. The technical solution provided by this application aims to improve the assembly sealing effect of the electrolysis assembly, further enhancing its structural stability and reliability.

Description

Technical Field

[0001] The embodiments in this application relate to the field of new energy equipment technology, and in particular to an electrolysis component and an electrolysis hydrogen production device. Background Technology

[0002] In related technologies, the electrolysis components of an electrolytic hydrogen production device can typically be assembled into a whole by stacking bipolar plates and membrane electrodes in sequence. By setting a sealing structure between the bipolar plates and the membrane electrodes, a chamber with a certain sealing performance can be formed between the bipolar plates and the membrane electrodes. Electrolyte solution can be injected into this chamber for electrolysis to produce a certain amount of gas.

[0003] However, in existing electrolysis modules, the sealing structure between the bipolar plate and the membrane electrode is easily subjected to frequent pressure, which can cause slippage or breakage, affecting the stable sealing between the bipolar plate and the membrane electrode. This can lead to gas leakage in the electrolysis module and reduce its service life. Utility Model Content

[0004] This application provides several embodiments of an electrolysis assembly and an electrolysis hydrogen production device, aiming to improve the assembly and sealing effect of the electrolysis assembly and further enhance its structural stability and reliability.

[0005] An embodiment of this application provides an electrolysis assembly including a membrane electrode, a bipolar plate, and a sealing structure. The membrane electrode includes a membrane electrode body and a frame. The frame surrounds the membrane electrode body, and a first groove is provided on the surface of the frame, which surrounds the membrane electrode body. The bipolar plate is stacked with the membrane electrode, and a second groove is provided on the surface of the bipolar plate facing the membrane electrode. The second groove is connected to the first groove. The sealing structure is disposed in the first and second grooves and is connected to the inner walls of the first and second grooves.

[0006] In one embodiment, the surface roughness of the inner wall of the first groove is Ra1, 3.2μm≤Ra1≤6.3μm; and / or, the surface roughness of the inner wall of the second groove is Ra2, 3.2μm≤Ra2≤6.3μm.

[0007] In one embodiment, the groove depth of the first groove along the thickness direction of the membrane electrode is H1, 0.05mm≤H1≤0.4mm; and / or, in a direction perpendicular to the thickness direction of the membrane electrode, the groove width of the first groove is W1, 3mm≤W1≤8mm.

[0008] In one embodiment, the width of the first groove in the thickness direction of the membrane electrode is gradually reduced in the direction away from the bipolar plate.

[0009] In one embodiment, the width of the first groove gradually increases in the direction away from the bipolar plate in the thickness direction of the membrane electrode.

[0010] In one embodiment, the second groove has a groove depth of H2 along the thickness direction of the bipolar plate, 0.4mm≤H2≤1mm; and / or, in a direction perpendicular to the thickness direction of the bipolar plate, the first groove has a groove width of W3, 3mm≤W3≤8mm.

[0011] In one embodiment, the width of the second groove in the thickness direction of the bipolar plate gradually decreases in the direction away from the membrane electrode.

[0012] In one embodiment, the width of the second groove gradually increases in the direction away from the membrane electrode in the thickness direction of the bipolar plate.

[0013] In one embodiment, the sealing structure is made of one of the following materials: fluororubber, fluororubber and carbon fiber composite material, or modified polytetrafluoroethylene material.

[0014] An embodiment of this application also proposes an electrolytic hydrogen production device, which includes a device body and an electrolysis component, wherein the electrolysis component is the aforementioned electrolysis component, and the electrolysis component is installed on the device body.

[0015] In several embodiments provided in this application, a first groove is provided on the edge surface of the membrane electrode, surrounding the membrane electrode body. A second groove is provided correspondingly on the bipolar plate facing the membrane electrode, with the second groove corresponding to the first groove. This allows the openings of the first and second grooves to connect and align, enabling the sealing structure to be filled into both grooves. The sealing structure is tightly fitted to the inner walls of both grooves, allowing it to simultaneously engage with both the membrane electrode and the bipolar plate, thus providing a better seal between them. By embedding the sealing structure in the first groove of the membrane electrode and the second groove of the bipolar plate, the membrane electrode and bipolar plate provide a bidirectional mechanical locking effect, which helps to counteract the shear stress caused by pressure fluctuations during the operation of the electrolytic hydrogen production device. This better prevents the sealing structure from separating from the membrane electrode and bipolar plate under stress, avoiding loosening or popping out. This allows the electrolysis assembly to achieve a better sealing effect, ensuring stable electrolysis operation of the hydrogen production device and further improving the structural stability and reliability of the electrolysis assembly. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments or prior art of this application, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the electrolysis component provided in this application;

[0018] Figure 2 for Figure 1 An exploded view of the structure of an embodiment of an electrolysis assembly;

[0019] Figure 3 for Figure 1 A partial cross-sectional view of an embodiment of an electrolysis assembly;

[0020] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0021] Figure 5 A cross-sectional view of the first embodiment of the electrolysis assembly provided in this application;

[0022] Figure 6 for Figure 5 A schematic diagram of some structural parameters of the electrolysis unit;

[0023] Figure 7 A cross-sectional view of the second embodiment of the electrolysis assembly provided in this application;

[0024] Figure 8 for Figure 7 A schematic diagram of some structural parameters of the electrolysis unit;

[0025] Figure 9 A cross-sectional view of the third embodiment of the electrolysis assembly provided in this application;

[0026] Figure 10 for Figure 9 A schematic diagram of some structural parameters of the electrolysis unit.

[0027] Explanation of icon numbers:

[0028] 100. Electrolysis assembly; 10. Membrane electrode; 11. Membrane electrode body; 13. Frame; 131. First groove; 30. Bipolar plate; 31. Second groove; 50. Sealing structure. Detailed Implementation

[0029] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of several embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0030] It should be noted that if directional indications (such as up, down, left, right, front, back, etc.) are involved in multiple embodiments of this application, the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0031] Furthermore, if multiple embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0032] In related technologies, the electrolysis components of electrolytic hydrogen production devices are typically assembled by stacking bipolar plates and membrane electrodes sequentially to form a single unit. By setting a sealing structure between the bipolar plates and the membrane electrodes, a chamber with a certain sealing performance can be formed between the bipolar plates and the membrane electrodes. Electrolyte solution can be injected into this chamber for electrolysis to produce a certain amount of gas. However, in existing electrolysis components, the sealing structure between the bipolar plates and the membrane electrodes is prone to slippage or dislodgement under frequent pressure, affecting the stable sealing effect between the bipolar plates and the membrane electrodes. This, in turn, leads to gas leakage in the electrolysis component and reduces its service life.

[0033] It is understandable that an electrolytic hydrogen production device can include an electrolytic cell, within which electrolytic components such as membrane electrodes and bipolar plates can be stacked sequentially. An electrolytic space is formed by the gap between the membrane electrodes and bipolar plates, allowing the electrolyte solution to be injected into this space. The electrolytic components are then energized to induce an electrolytic reaction, achieving stable electrolytic operation of the hydrogen production device. A sealing structure can be installed between the membrane electrodes and bipolar plates in the electrolytic components. This sealing structure creates a relatively sealed electrolytic space, preventing electrolyte leakage and the escape of generated gases. However, in most existing electrolytic components, grooves are formed on the surface of the bipolar plates, and the sealing structure fills these grooves. Alternatively, by stacking the membrane electrodes on the bipolar plates, covering the grooves, and ensuring the sealing structure is in close contact with the surface of the membrane electrodes, the sealing structure achieves a sealing connection between the membrane electrodes and the bipolar plates. Thus, when the electrolytic hydrogen production equipment is subjected to external forces during operation, causing frequent pressure fluctuations in the electrolysis components, the sealing structure can easily move relative to the membrane electrode and bipolar plates, leading to separation of the sealing structure from the membrane electrode and bipolar plates and affecting the sealing effect of the electrolysis components. To address the above problems, this application proposes an electrolysis component 100.

[0034] Please see Figure 1 , Figure 2 and Figure 4 In one embodiment of this application, the electrolysis assembly 100 includes a membrane electrode 10, a bipolar plate 30, and a sealing structure 50. The membrane electrode 10 includes a membrane electrode body 11 and a frame 13. The frame 13 is disposed around the membrane electrode body 11, and a first groove 131 is provided on the surface of the frame 13, which surrounds the membrane electrode body 11. The bipolar plate 30 is stacked with the membrane electrode 10, and a second groove 31 is provided on the surface of the bipolar plate 30 facing the membrane electrode 10. The second groove 31 is connected to the first groove 131. The sealing structure is disposed in the first groove 131 and the second groove 31, and is connected to the inner wall of the first groove 131 and the inner wall of the second groove 31.

[0035] In this embodiment, the membrane electrode 10 can integrate components such as a proton exchange membrane, a catalytic layer, and a diffusion layer into the membrane electrode body 11. A frame 13 surrounds and connects the membrane electrode body 11 to form a whole, which better ensures the overall structural stability of the membrane electrode 10 and the stable stacking and installation of the membrane electrode 10 and the bipolar plate 30. A first groove 131 is recessed in the frame 13, and the first groove 131 can be positioned along the frame 13 so that it corresponds to and surrounds the membrane electrode body 11, ensuring a stable sealing effect of the sealing structure 50 on the membrane electrode body 11 when it is placed within the first groove 131. A second groove 31 is placed on the surface of the bipolar plate 30 facing the membrane electrode 10. The position of the second groove 31 corresponds to the position of the first groove 131, so that the second groove 31 and the first groove 131 are symmetrically arranged in the plane of the stacked membrane electrode 10 and bipolar plate 30, allowing the openings of the first groove 131 and the second groove 31 to communicate with each other.

[0036] Furthermore, by placing the sealing structure 50 within the interconnected first groove 131 and second groove 31, a portion of the sealing structure 50 can be tightly fitted and connected to the inner wall of the first groove 131, and another portion of the sealing structure 50 can be tightly fitted and connected to the inner wall of the second groove 31. This allows the membrane electrode 10 and the bipolar plate 30 to achieve a bidirectional mechanical locking effect with the sealing structure 50 under the action of the first groove 131 and the second groove 31. This facilitates the formation of a limiting and fixing structure for the sealing structure 50 within the first groove 131 and the second groove 31. When the electrolysis assembly 100 is subjected to frequent pressure and agitation, causing the sealing structure 50 to be subjected to a certain shear stress, the connection between the inner walls of the first groove 131 and the second groove 31 and the sealing structure 50 can prevent the sealing structure 50 from slipping or popping out. This further improves the connection stability between the membrane electrode 10, the bipolar plate 30, and the sealing structure 50, effectively preventing the electrolysis assembly 100 from experiencing electrolyte or gas overflow, and ensuring the stable operation of the electrolysis assembly 100.

[0037] The first groove 131 can be processed on the frame 13 of the membrane electrode 10 by means of precision laser cutting, die cutting or other methods, or the frame 13 of the membrane electrode 10 can be made by injection molding process to form the first groove 131 on the surface; similarly, the second groove 31 can be processed on the surface of the bipolar plate 30 by means of precision laser cutting, die cutting or other methods, or the bipolar plate 30 can be made by injection molding process to form the first groove 131 on the surface. By utilizing the contact between the sealing structure 50 and the inner wall of the first groove 131 and the inner wall of the second groove 31, the sealing structure 50 can be effectively embedded in the first groove 131 and the second groove 31. The sealing structure 50 can be fixed to the inner walls of the first groove 131 and the second groove 31 by adhesive bonding, thus achieving a stable assembly of the electrolysis assembly 100. Alternatively, the sealing structure 50 can be placed into the first groove 131 and the second groove 31 by hot pressing, and the sealing structure 50 can undergo a certain deformation to tightly fit the inner walls of the first groove 131 and the second groove 31 when the membrane electrode 10 and the bipolar plate 30 are pressed, thus achieving a stable assembly of the electrolysis assembly 100. Or, the membrane electrode 10 and the bipolar plate 30 can be tightly stacked first, and then the molten sealing structure 50 can be injected into the first groove 131 and the second groove 31, so that the sealing structure 50 fills the first groove 131 and the second groove 31, and after the sealing structure 50 solidifies, it is firmly connected to the inner walls of the first groove 131 and the second groove 31, thus achieving a stable assembly of the electrolysis assembly 100. Of course, there are many other ways in which the sealing structure 50 can be connected in the first groove 131 and the second groove 31, and this application does not limit this.

[0038] The sealing structure 50 can be made of one of the following materials: fluororubber, fluororubber and carbon fiber composite material, or modified polytetrafluoroethylene. Sealing structures 50 made of these materials possess good overall structural strength, acid and alkali resistance, and corrosion resistance. This allows the sealing structure 50 to be more stably positioned between the membrane electrode 10 and the bipolar plate 30, maintaining a tight seal and better preventing leakage of liquid or gas from the electrolysis assembly 100, thereby further improving the overall structural stability and reliability of the electrolysis assembly 100. Of course, the sealing structure 50 can be made of many other materials, and this application does not limit the material of the sealing structure 50.

[0039] Furthermore, the electrolysis assembly 100 is installed in the electrolysis hydrogen production device. It can typically be installed by stacking multiple membrane electrodes 10 and bipolar plates 30 in sequence. Therefore, the first groove 131 can be provided on the opposite sides of the frame 13 of the membrane electrode 10, and the second groove 31 can be provided on the opposite two plates of the bipolar plate 30. This allows any two stacked membrane electrodes 10 and bipolar plates 30 to be connected relative to each other through the first groove 131 and the second groove 31, so that the sealing structure 50 can be stably and sealed between any two stacked membrane electrodes 10 and bipolar plates 30, ensuring the overall stable electrolysis operation of the electrolysis hydrogen production system.

[0040] In one embodiment of this application, a first groove 131 is provided on the surface of the frame 13 of the membrane electrode 10, so that the first groove 131 surrounds the membrane electrode body 11, and a second groove 31 is provided correspondingly on the plate surface of the bipolar plate 30 facing the membrane electrode 10, so that the second groove 31 is correspondingly provided with the first groove 131. This allows the groove opening of the first groove 131 to be connected with the groove opening of the second groove 31, thereby filling the sealing structure 50 into the first groove 131 and the second groove 31. The sealing structure 50 is tightly fitted and connected to the inner wall of the first groove 131 and the inner wall of the second groove 31, so that the sealing structure 50 can be simultaneously snapped onto the membrane electrode 10 and the bipolar plate 30, thereby achieving a better sealing effect on the gap between the membrane electrode 10 and the bipolar plate 30. By embedding the sealing structure 50 in the first groove 131 of the membrane electrode 10 and the second groove 31 of the bipolar plate 30, the membrane electrode 10 and the bipolar plate 30 can provide a bidirectional mechanical locking effect on the sealing structure 50. This helps to counteract the shear stress caused by pressure fluctuations during the operation of the electrolytic hydrogen production device, better prevents the sealing structure 50 from separating from the membrane electrode 10 and the bipolar plate 30 under stress, avoids the sealing structure 50 from loosening or popping out, and enables the electrolysis assembly 100 to achieve a better sealing effect, ensuring the stable electrolysis operation of the electrolytic hydrogen production device, and further improving the structural stability and reliability of the electrolysis assembly 100.

[0041] In one embodiment of this application, the surface roughness of the inner wall of the first groove 131 is Ra1, 3.2μm≤Ra1≤6.3μm;

[0042] And / or, the surface roughness of the inner wall of the second groove 31 is Ra2, 3.2μm≤Ra2≤6.3μm.

[0043] In some embodiments, the inner wall of the first groove 131 formed by the frame 13 of the membrane electrode 10 can be roughened. This can be achieved by using a laser to create a rough, micro-textured surface on the inner wall of the first groove 131; alternatively, a polytetrafluoroethylene coating can be applied to the inner wall of the first groove 131 to create an uneven, rough surface; or, sandpaper can be used to polish the inner wall of the first groove 131. By creating a rough surface on the inner wall of the first groove 131, the adhesion of the sealing structure 50 can be improved, the sliding of the sealing structure 50 within the first groove 131 can be reduced, and the connection stability and reliability between the sealing structure 50 and the frame 13 of the membrane electrode 10 can be further improved. This prevents the sealing structure 50 from detaching from the membrane electrode 10 and ensures the sealing effect of the electrolysis assembly 100. The surface roughness Ra1 of the inner wall of the first groove 131 can be limited to between 3.2 μm and 6.3 μm. By making Ra1 greater than or equal to 3.2 μm, the inner wall of the first groove 131 can have a larger roughness, so that the sealing structure 50 can be more firmly attached to the inner wall of the first groove 131 and prevent the sealing structure 50 from detaching from the membrane electrode 10. At the same time, by making Ra1 less than or equal to 6.3 μm, the stable connection between the sealing structure 50 and the membrane electrode 10 can be ensured within this roughness range, and the roughness of the inner wall of the first groove 131 can be avoided to be too large, reducing the manufacturing difficulty of the membrane electrode 10.

[0044] Similarly, in some embodiments, the inner wall of the second groove 31 formed by the frame 13 of the bipolar plate 30 can be roughened. This can be achieved by using a laser to create a rough, micro-textured surface on the inner wall of the second groove 31; alternatively, a polytetrafluoroethylene coating can be applied to the second groove 31, creating an uneven, rough surface on its inner wall; or, sandpaper can be used to polish the inner wall of the second groove 31. By creating a rough surface on the inner wall of the second groove 31, the adhesion of the sealing structure 50 can be improved, reducing the sliding of the sealing structure 50 within the second groove 31. This further enhances the connection stability and reliability between the sealing structure 50 and the frame 13 of the bipolar plate 30, preventing the sealing structure 50 from detaching from the bipolar plate 30 and ensuring the sealing effect of the electrolysis assembly 100. The surface roughness Ra1 of the inner wall of the second groove 31 can be limited to between 3.2 μm and 6.3 μm. By making Ra1 greater than or equal to 3.2 μm, the inner wall of the second groove 31 can have a larger roughness, so that the sealing structure 50 can be more firmly attached to the inner wall of the second groove 31 and prevent the sealing structure 50 from detaching from the bipolar plate 30. At the same time, by making Ra1 less than or equal to 6.3 μm, the stable connection between the sealing structure 50 and the bipolar plate 30 can be ensured within this roughness range, and the excessive roughness of the inner wall of the second groove 31 can be avoided, reducing the manufacturing difficulty of the bipolar plate 30.

[0045] Furthermore, in some embodiments, the inner walls of the first groove 131 on the frame 13 of the membrane electrode 10 and the second groove 31 on the bipolar plate 30 of the electrolysis assembly 100 can both be made with rough surfaces. The processing methods of the inner walls of the first groove 131 and the second groove 31 can be as described above, and the surface roughness of the inner walls of the first groove 131 and the second groove 31 can also be limited to the numerical ranges described above. Thus, by making the inner walls of the first groove 131 and the second groove 31 both rough surfaces, the connection between the sealing structure 50 and the membrane electrode 10 and the bipolar plate 30 can be made more stable, enabling the sealing structure 50 to achieve a better bidirectional locking effect in the electrolysis assembly 100, better preventing the sealing structure 50 from slipping off or popping out, achieving a better sealing effect of the electrolysis assembly 100, and further improving the structural stability and reliability of the electrolysis assembly 100.

[0046] See Figure 6 , Figure 8 and Figure 10In one embodiment of this application, the groove depth of the first groove 131 along the thickness direction of the membrane electrode 10 is H1, 0.05mm≤H1≤0.4mm; and / or, in a direction perpendicular to the thickness direction of the membrane electrode 10, the groove width of the first groove 131 is W1, 3mm≤W1≤8mm.

[0047] In some embodiments, the thickness of the membrane electrode 10 can be as follows: Figure 6 , Figure 8 and Figure 10 As shown, this is the stacking direction of the membrane electrode 10 and the bipolar plate 30. By limiting the groove depth H1 of the first groove 131 along the thickness direction of the membrane electrode 10 to between 0.05mm and 0.4mm, the first groove 131 can have a certain depth to accommodate the sealing structure 50, ensuring a stable connection between the sealing structure 50 and the membrane electrode 10. By making H1 greater than or equal to 0.05 mm, the first groove 131 can have a certain depth limit to accommodate the sealing structure 50, preventing the sealing structure 50 from falling out of the first groove 131. At the same time, since the thickness of the membrane electrode 10 is small, by making H1 less than or equal to 0.4 mm, the depth of the first groove 131 can be prevented from being too large within this depth range, avoiding the first groove 131 being set as a through hole structure penetrating the frame 13 of the membrane electrode 10. This ensures that the first groove 131 can support and install the sealing structure 50, so that the sealing structure 50 can be more stably connected and sealed with the inner wall of the first groove 131, preventing the sealing structure 50 from sliding out or popping out within the electrolysis assembly 100, achieving a better sealing effect for the electrolysis assembly 100, and further improving the structural stability and reliability of the electrolysis assembly 100.

[0048] In some embodiments, the direction perpendicular to the thickness direction of the membrane electrode 10 can be the plane direction where the membrane electrode 10 is located. By limiting the groove width W1 of the first groove 131 in this direction to between 3mm and 8mm, the first groove 131 can accommodate the sealing structure 50 with a certain width, thereby preventing the sealing structure 50 installed between the membrane electrode 10 and the bipolar plate 30 from breaking and ensuring the stable sealing effect of the sealing structure 50 on the membrane electrode 10 and the bipolar plate 30. By making the groove width W1 of the first groove 131 less than or equal to 3mm, the first groove 131 can have a larger groove width space, so that the sealing structure 50 can be set with a larger width dimension. This helps to better prevent the sealing structure 50 from breaking and ensures the sealing effect between the bipolar plate 30 and the membrane electrode 10. At the same time, by making the groove width W1 of the first groove 131 less than or equal to 8mm, within this range, the first groove 131 can have a certain space to accommodate the sealing structure 50. This allows the sealing structure 50 to be set with a more suitable structural size, ensuring the structural strength of the sealing structure 50, achieving a stable sealing effect between the membrane electrode 10 and the bipolar plate 30, and avoiding the first groove 131 occupying too much space. This allows the membrane electrode 10 to maintain a certain structural strength when it is made with a smaller structural size, preventing the frame 13 of the membrane electrode 10 from deforming, and further improving the structural stability and reliability of the electrolysis assembly 100.

[0049] Furthermore, in some embodiments, the membrane electrode 10 can limit the depth and width of the first groove 131 within a certain range to ensure that the first groove 131 can stably accommodate the sealing structure 50, while minimizing the impact of the first groove 131 on the structural strength of the membrane electrode 10 frame 13, thereby improving the structural stability and sealing effect of the electrolysis assembly 100. The depth H1 and width W1 of the first groove 131 can be the values ​​defined in the above embodiments to achieve a more stable and reliable structural design for the membrane electrode 10.

[0050] It should be noted that the longitudinal cross-sectional shape of the first groove 131 in the thickness direction of the membrane electrode 10 can be of many kinds, such as square, trapezoidal or inverted trapezoidal, etc. The membrane electrode 10 can be provided with a first groove 131 of a corresponding cross-sectional shape according to the application requirements of the electrolysis assembly 100.

[0051] For example, such as Figure 5 and Figure 6 As shown, the membrane electrode 10 has a square cross-sectional shape for the first groove 131, which makes the membrane electrode 10 easier to manufacture and process, and reduces the production cost of the electrolysis assembly 100.

[0052] Alternatively, the membrane electrode 10 can have the first groove 131 adopt an inverted trapezoidal groove structure that is wider at the top and narrower at the bottom in the direction away from the bipolar plate 30, that is, see [reference]. Figure 7 and Figure 8 In one embodiment of this application, in the thickness direction of the membrane electrode 10, the groove width of the first groove 131 is gradually reduced in the direction away from the bipolar plate 30.

[0053] In this embodiment, by gradually reducing the width of the first groove 131 away from the bipolar plate 30, the width of the groove opening facing the surface of the first groove 131 is greater than the width of the bottom wall of the first groove 131. This makes the inner wall of the first groove 131 inclined or arc-shaped, which helps to guide the deformation of the sealing structure 50 when it is installed in the first groove 131, preventing the sealing structure 50 from being squeezed out of the first groove 131. At the same time, the inclined or arc-shaped inner wall of the first groove 131 can distribute the stress of the sealing structure 50 more evenly, which helps to reduce local stress concentration on the sealing structure 50, delay material fatigue, ensure the stable connection between the sealing structure 50 and the membrane electrode 10, and better prevent the sealing structure 50 from detaching or popping out of the first groove 131, thus achieving a better sealing effect of the electrolysis assembly 100.

[0054] Further, see Figure 8 In one embodiment of this application, the inner wall of the first groove 131 is inclined relative to the thickness direction of the membrane electrode 10, and the angle between the inner wall of the first groove 131 and the thickness direction of the membrane electrode 10 is α, where 5°≤α≤45°.

[0055] In some embodiments, the inner wall of the first groove 131 can be provided with an inclined surface. In this case, the angle α between the inner wall of the first groove 131 and the thickness direction of the membrane electrode 10 can be limited to between 5° and 45°. This allows the inner wall of the first groove 131 to have a better angle design, ensuring uniform stress on the sealing structure 50. By making α greater than or equal to 5°, the inner wall of the first groove 131 can be provided with a larger inclined angle, ensuring that the sealing structure 50 can reduce stress concentration under the action of the inclined inner wall of the first groove 131, and better prevent the sealing structure 50 from detaching from the first groove 131. At the same time, by making α less than or equal to 45°, within this angle range, the first groove 131 can form a more stable inverted trapezoidal groove structure design, ensuring the stable installation of the sealing structure 50 in the first groove 131. This allows the sealing structure 50 to maintain uniform stress under the action of the inclined inner wall of the first groove 131, better reducing local stress concentration in the sealing structure 50, preventing the sealing structure 50 from detaching from the first groove 131, and further improving the structural stability and reliability of the electrolysis assembly 100.

[0056] Alternatively, the membrane electrode 10 can have the first groove 131 adopt a trapezoidal groove structure that is narrower at the top and wider at the bottom in the direction away from the bipolar plate 30, that is, see [reference]. Figure 9 and Figure 10 In one embodiment of this application, in the thickness direction of the membrane electrode 10, the groove width of the first groove 131 is gradually increased in the direction away from the bipolar plate 30.

[0057] In this embodiment, by gradually increasing the width of the first groove 131 away from the bipolar plate 30, the width of the groove opening facing the surface of the first groove 131 is smaller than the width of the bottom wall of the first groove 131, making the inner wall of the first groove 131 inclined or arc-shaped. At this time, the two opposite inner walls of the first groove 131 can form a certain limiting and fastening space, so that when the sealing structure 50 is installed in the first groove 131, a portion of the sealing structure 50 can deform and embed itself in the two opposite inner walls of the first groove 131. This allows the sealing structure 50 to be more stably constrained within the first groove 131, better preventing the sealing structure 50 from detaching or popping out of the first groove 131, achieving a more stable connection between the sealing structure 50 and the membrane electrode 10, and further improving the overall structural stability and sealing effect of the electrolysis assembly 100.

[0058] Further, see Figure 10 In one embodiment of this application, the inner wall of the first groove 131 is inclined relative to the thickness direction of the membrane electrode 10, and the angle between the inner wall of the first groove 131 and the thickness direction of the membrane electrode 10 is β, where 10°≤β≤45°.

[0059] In some embodiments, the inner wall of the first groove 131 can be provided with an inclined surface. In this case, the angle β between the inner wall of the first groove 131 and the thickness direction of the membrane electrode 10 can be limited to between 10° and 45°. This allows the inner wall of the first groove 131 to have a better angle design, achieving a more stable constraint effect on the sealing structure 50. By making β greater than or equal to 10°, the inner wall of the first groove 131 can be provided with a larger inclined angle, so that the inner wall of the first groove 131 forms a larger limiting space. This allows the sealing structure 50 to better engage part of the structure within the limiting space, better preventing the sealing structure 50 from detaching from the first groove 131. At the same time, by making β less than or equal to 45°, within this angle range, the first groove 131 can form a more stable trapezoidal groove structure design. This helps to avoid the sealing structure 50 being subjected to a small angle clamping effect, which could lead to a certain probability of breakage. This ensures the overall structural stability of the sealing structure 50 within the first groove 131, prevents the sealing structure 50 from detaching from the first groove 131, and further improves the structural stability and reliability of the electrolysis assembly 100.

[0060] See Figure 6 , Figure 8 and Figure 10 In one embodiment of this application, the groove depth of the second groove 31 along the thickness direction of the bipolar plate 30 is H2, 0.4mm≤H2≤1mm; and / or, in a direction perpendicular to the thickness direction of the bipolar plate 30, the groove width of the first groove 131 is W3, 3mm≤W3≤8mm.

[0061] In some embodiments, the thickness of the bipolar plate 30 can be as follows: Figure 6 , Figure 8 and Figure 10As shown, this is the stacking direction of the bipolar plates 30. By limiting the groove depth H2 of the second groove 31 along the thickness direction of the bipolar plate 30 to between 0.4mm and 1mm, the second groove 31 can have a certain depth to accommodate the sealing structure 50, ensuring a stable connection between the sealing structure 50 and the bipolar plate 30. By making H2 greater than or equal to 0.4 mm, the second groove 31 can have a certain depth limit to accommodate the sealing structure 50, preventing the sealing structure 50 from falling out of the second groove 31. At the same time, since the thickness of the bipolar plate 30 is small, by making H2 less than or equal to 1 mm, the depth of the second groove 31 can be prevented from being too large within this depth range, avoiding the second groove 31 being set as a through hole structure penetrating the frame 13 of the bipolar plate 30. This ensures that the second groove 31 can support and install the sealing structure 50, so that the sealing structure 50 can be more stably connected and sealed with the inner wall of the second groove 31, preventing the sealing structure 50 from sliding out or popping out within the electrolysis assembly 100, achieving a better sealing effect for the electrolysis assembly 100, and further improving the structural stability and reliability of the electrolysis assembly 100.

[0062] In some embodiments, the direction perpendicular to the thickness direction of the bipolar plate 30 can be the plane direction where the bipolar plate 30 is located. By limiting the groove width W2 of the second groove 31 in this direction to between 3mm and 8mm, the second groove 31 can accommodate the sealing structure 50 with a certain width, thereby preventing the sealing structure 50 installed between the bipolar plates 30 from breaking and ensuring the stable sealing effect of the sealing structure 50 on the bipolar plates 30. Specifically, by making the groove width W2 of the second groove 31 less than or equal to 3mm, the second groove 31 can have a larger groove width space, allowing the sealing structure 50 to adopt a larger width structure, which helps to better prevent the sealing structure 50 from breaking and ensures the sealing effect between the bipolar plates 30. At the same time, by making the groove width W2 of the second groove 31 less than or equal to 8mm, within this range, the second groove 31 can have a certain space to accommodate the sealing structure 50, allowing the sealing structure 50 to adopt a more suitable structural size, ensuring the structural strength of the sealing structure 50, achieving a stable sealing effect between the bipolar plates 30, and avoiding the second groove 31 occupying too much space, so that the bipolar plates 30 can maintain a certain structural strength when manufactured with a smaller structural size, preventing the frame 13 of the bipolar plates 30 from deforming, and further improving the structural stability and reliability of the electrolysis assembly 100.

[0063] Furthermore, in some embodiments, the bipolar plate 30 can limit the depth and width of the second groove 31 within a certain range to ensure that the second groove 31 can stably accommodate the sealing structure 50, while minimizing the impact of the second groove 31 on the structural strength of the bipolar plate 30 frame 13, thereby improving the structural stability and sealing effect of the electrolysis assembly 100. The depth H2 and width W2 of the second groove 31 can be the values ​​defined in the above embodiments to achieve a more stable and reliable structural design for the bipolar plate 30.

[0064] It should be noted that the longitudinal cross-sectional shape of the second groove 31 in the thickness direction of the bipolar plate 30 can be of many kinds, such as square, trapezoidal or inverted trapezoidal, etc. The bipolar plate 30 can be provided with a second groove 31 of the corresponding cross-sectional shape according to the application requirements of the electrolysis assembly 100.

[0065] For example, such as Figure 5 and Figure 6 As shown, the bipolar plate 30 enables the second groove 31 to adopt a groove structure with a square cross-section, which can facilitate the production and processing of the bipolar plate 30 and better reduce the production cost of the electrolysis assembly 100.

[0066] Alternatively, the bipolar plate 30 can have the second groove 31 adopt an inverted trapezoidal groove structure that is wider at the top and narrower at the bottom in the direction away from the membrane electrode 10, that is, see [reference]. Figure 7 and Figure 8 In one embodiment of this application, in the thickness direction of the bipolar plate 30, the groove width of the second groove 31 is gradually reduced in the direction away from the bipolar plate 30.

[0067] In this embodiment, by gradually reducing the width of the second groove 31 away from the membrane electrode 10, the width of the groove opening facing the membrane electrode 10 is greater than the width of the bottom wall of the second groove 31. This allows the inner wall of the second groove 31 to be inclined or arc-shaped. When the sealing structure 50 is installed in the second groove 31, the inner wall of the second groove 31 can guide the deformation of the sealing structure 50, preventing it from being squeezed out of the second groove 31. Simultaneously, the inclined or arc-shaped inner wall of the second groove 31 can more evenly distribute stress on the sealing structure 50, reducing local stress concentration, delaying material fatigue, ensuring a stable connection between the sealing structure 50 and the bipolar plate 30, and better preventing the sealing structure 50 from detaching or popping out of the second groove 31, thus achieving a better sealing effect for the electrolysis assembly 100.

[0068] Further, see Figure 8In one embodiment of this application, the inner wall of the second groove 31 is inclined relative to the thickness direction of the bipolar plate 30, and the angle between the inner wall of the second groove 31 and the thickness direction of the bipolar plate 30 is γ, where 5°≤γ≤45°.

[0069] In some embodiments, the inner wall of the second groove 31 can be provided with an inclined surface. In this case, the angle γ between the inner wall of the second groove 31 and the thickness direction of the bipolar plate 30 can be limited to between 5° and 45°. This allows the inner wall of the second groove 31 to have a better angle design, ensuring uniform stress on the sealing structure 50. By making γ greater than or equal to 5°, the inner wall of the second groove 31 can be provided with a larger inclined angle, ensuring that the sealing structure 50 can reduce stress concentration under the action of the inclined inner wall of the second groove 31, and better prevent the sealing structure 50 from detaching from the second groove 31. At the same time, by making γ less than or equal to 45°, within this angle range, the second groove 31 can form a more stable inverted trapezoidal groove structure design, ensuring the stable installation of the sealing structure 50 in the second groove 31. This allows the sealing structure 50 to maintain uniform stress under the action of the inclined inner wall of the second groove 31, better reducing local stress concentration in the sealing structure 50, preventing the sealing structure 50 from detaching from the second groove 31, and further improving the structural stability and reliability of the electrolysis assembly 100.

[0070] Alternatively, the bipolar plate 30 can have the second groove 31 adopt a trapezoidal groove structure that is narrower at the top and wider at the bottom in the direction away from the membrane electrode 10, that is, see [reference]. Figure 9 and Figure 10 In one embodiment of this application, in the thickness direction of the bipolar plate 30, the width of the second groove 31 gradually increases in the direction away from the bipolar plate 30.

[0071] In this embodiment, by gradually increasing the width of the second groove 31 along the direction away from the membrane electrode 10, the width of the groove opening facing the membrane electrode 10 is made smaller than the width of the bottom wall of the second groove 31, making the inner wall of the second groove 31 inclined or arc-shaped. At this time, the two opposite inner walls of the second groove 31 can form a certain limiting and fastening space, so that when the sealing structure 50 is installed in the second groove 31, a portion of the sealing structure 50 can deform and embed itself in the two opposite inner walls of the second groove 31. This allows the sealing structure 50 to be more stably constrained within the second groove 31, better preventing the sealing structure 50 from detaching or popping out of the second groove 31, achieving a more stable connection between the sealing structure 50 and the bipolar plate 30, and further improving the overall structural stability and sealing effect of the electrolysis assembly 100.

[0072] Further, see Figure 10In one embodiment of this application, the inner wall of the second groove 31 is inclined relative to the thickness direction of the bipolar plate 30, and the angle between the inner wall of the second groove 31 and the thickness direction of the bipolar plate 30 is δ, where 10°≤δ≤45°.

[0073] In some embodiments, the inner wall of the second groove 31 can be provided with an inclined surface. In this case, the angle δ between the inner wall of the second groove 31 and the thickness direction of the bipolar plate 30 can be limited to between 10° and 45°. This allows the inner wall of the second groove 31 to have a better angle design, achieving a more stable constraint effect on the sealing structure 50. By making δ greater than or equal to 10°, the inner wall of the second groove 31 can be provided with a larger inclined angle, so that the inner wall of the second groove 31 forms a larger limiting space. This allows the sealing structure 50 to better engage part of the structure within the limiting space, better preventing the sealing structure 50 from detaching from the second groove 31. At the same time, by making δ less than or equal to 45°, within this angle range, the second groove 31 can form a more stable trapezoidal groove structure design. This helps to avoid the sealing structure 50 being subjected to a small angle clamping effect, which could lead to a certain probability of breakage. This ensures the overall structural stability of the sealing structure 50 within the second groove 31, prevents the sealing structure 50 from detaching from the second groove 31, and further improves the structural stability and reliability of the electrolysis assembly 100.

[0074] This application also proposes an electrolytic hydrogen production device, which includes a device body and an electrolysis component 100. The specific structure of the electrolysis component 100 is as described in the above embodiments. Since this electrolytic hydrogen production device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0075] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. An electrolysis assembly, characterized in that, include: A membrane electrode, comprising a membrane electrode body and a frame, the frame being disposed around the membrane electrode body, and a first groove being provided on the surface of the frame, the first groove being disposed around the membrane electrode body; A bipolar plate, wherein the bipolar plate and the membrane electrode are stacked together, and the surface of the bipolar plate facing the membrane electrode is provided with a second groove, the second groove being connected to the first groove; A sealing structure is provided in the first groove and the second groove, and is connected to the inner wall of the first groove and the inner wall of the second groove.

2. The electrolysis assembly as described in claim 1, characterized in that, The surface roughness of the inner wall of the first groove is Ra1, 3.2μm≤Ra1≤6.3μm; And / or, the surface roughness of the inner wall of the second groove is Ra2, 3.2μm≤Ra2≤6.3μm.

3. The electrolysis assembly as described in claim 1, characterized in that, The first groove has a groove depth of H1 along the thickness direction of the membrane electrode, where 0.05mm ≤ H1 ≤ 0.4mm; And / or, in a direction perpendicular to the thickness direction of the membrane electrode, the groove width of the first groove is W1, 3mm≤W1≤8mm.

4. The electrolysis assembly as described in claim 3, characterized in that, In the thickness direction of the membrane electrode, the width of the first groove is gradually reduced in the direction away from the bipolar plate.

5. The electrolysis assembly as described in claim 3, characterized in that, In the thickness direction of the membrane electrode, the width of the first groove gradually increases in the direction away from the bipolar plate.

6. The electrolysis assembly as described in claim 1, characterized in that, The second groove has a groove depth of H2 along the thickness direction of the bipolar plate, where 0.4mm≤H2≤1mm; And / or, in a direction perpendicular to the thickness direction of the bipolar plate, the groove width of the first groove is W3, 3mm≤W3≤8mm.

7. The electrolysis assembly as described in claim 6, characterized in that, In the thickness direction of the bipolar plate, the width of the second groove gradually decreases in the direction away from the membrane electrode.

8. The electrolysis assembly as described in claim 6, characterized in that, In the thickness direction of the bipolar plate, the width of the second groove gradually increases in the direction away from the membrane electrode.

9. The electrolysis assembly as described in claim 1, characterized in that, The sealing structure is made of one of the following materials: fluororubber, fluororubber and carbon fiber composite material, or modified polytetrafluoroethylene material.

10. An electrolytic hydrogen production apparatus, characterized in that, The electrolytic hydrogen production device includes a device body and an electrolysis component, wherein the electrolysis component is the electrolysis component according to any one of claims 1 to 9, and the electrolysis component is installed on the device body.

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