A seal structure, mold and method having a dual seal configuration

Abstract

The application discloses a sealing structure with a double-sealing composition, a mold and a method, relates to the technical field of batteries, and solves the problem that the overhanging part of the membrane electrode side is prone to deformation in the injection molding process, has the beneficial effect of guaranteeing the sealing capacity of the membrane electrode, and specifically has the beneficial effect of guaranteeing the sealing capacity of the membrane electrode, and the specific scheme is as follows: a sealing structure with a double-sealing composition, comprising a first sealing piece and a second sealing piece, the first sealing piece and the second sealing piece are formed through different processes, the first sealing piece supports one side of the membrane electrode side during the forming process, and the first sealing piece supports the other side of the membrane electrode side during the forming process of the second sealing piece, the first sealing piece and the second sealing piece are arranged in relative and contact modes, the first sealing piece and the second sealing piece are in contact through a continuous zigzag structure to improve the toughness of the sealing structure, and the first sealing piece and the second sealing piece are in contact with the membrane electrode side.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a sealing structure, mold, and method with a dual-seal composition. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Explanation of relevant terms: Membrane electrode: The core power generation unit, consisting of a proton exchange membrane, a catalyst layer, and a gas diffusion layer, realizes the electrochemical conversion of hydrogen and oxygen.

[0004] Sealing structure: An elastomeric structure formed in the membrane electrode to prevent leakage of hydrogen gas from the anode and air from the cathode of the membrane electrode.

[0005] In the existing technical solutions, refer to Figure 1 As shown, the membrane electrode 1 and the sealing structure 2 are bonded by physical action or chemical action provided by the intermediate layer. In order to achieve the connection between the membrane electrode 1 and the sealing structure 2, they are specifically processed and manufactured by the first mold and the second mold. The first mold and the second mold are provided with a cavity and an active area. The active area is used to place the membrane electrode, and the cavity is used for the molding and sealing of the sealing structure. The membrane electrode is placed in the second mold, and the first mold is placed on the second mold. The suspended part of one end of the membrane electrode is placed in the cavity, and sealant is injected into the cavity until the seal is formed.

[0006] During injection molding, because the membrane electrode 1 has a suspended portion in the mold cavity, similar to a cantilever beam, and because the sealing structure is an integral structural component, the suspended portion will deform after being subjected to high pressure and high speed impact from the sealing material (e.g., Figure 2 As shown, the deformed membrane electrode side 3) results in a reduced contact area between the membrane electrode and the sealing structure, leading to a higher risk of seal failure.

[0007] In addition, because the membrane electrode has only one type of sealing material, the tolerance of both cathode air and anode hydrogen needs to be considered, which limits the selection of sealing materials. Summary of the Invention

[0008] To address the shortcomings of existing technologies, the purpose of this invention is to provide a sealing structure with a dual-seal composition, wherein the interface layer between the first and second sealing elements has high strength, effectively improving the toughness of the sealing structure.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solution: A sealing structure with dual seals includes a first seal and a second seal. The first seal and the second seal are formed separately through different processes. During the forming process of the first seal, one side of the membrane electrode is supported. During the forming process of the second seal, the first seal supports the other side of the membrane electrode. The first seal and the second seal are arranged opposite to and in contact with each other. The first seal and the second seal are in contact through a continuous serrated structure to improve the toughness of the sealing structure. Both the first seal and the second seal are in contact with the side of the membrane electrode. Both the first seal and the second seal are connected to the side of the membrane electrode by injection molding. The serrated structure includes a first serrated segment and a second serrated segment, which mesh with each other. The first serrated segment is located on the sealing surface of the first seal, and the second serrated segment is located on the sealing surface of the second seal.

[0010] As described above, in a sealing structure with a double seal, the first serrated segment includes a first protrusion and a first concave portion, which are alternately arranged, and the area of ​​the first protrusion is larger than the area of ​​the first concave portion. The second serrated segment includes a second convex portion and a second concave portion, which are alternately arranged. The height of the second convex portion is less than the depth of the second concave portion. The second convex portion is engaged with the first concave portion, and the first convex portion is engaged with the second concave portion.

[0011] As described above, in a sealing structure consisting of two seals, the first concave portion is trapezoidal in shape, and the first convex portion is inverted trapezoidal in shape. The height of the first protrusion is 2-4 times the depth of the first concave portion.

[0012] In the sealing structure with dual seals as described above, the maximum width of the first recess is greater than the maximum width of the first protrusion.

[0013] As described above, a sealing structure with a double seal is provided, wherein the first serrated segment includes multiple continuous raised areas, the raised areas are inverted V-shapes, and the raised areas include multiple continuous protruding steps; the second serrated segment includes multiple continuous recessed areas, the recessed areas are V-shapes, and the steps are arc-shaped steps or straight steps.

[0014] As described above, a sealing structure with dual seals is provided, wherein the first seal and the second seal are made of the same or different materials, the creep resistance of the first seal is better than that of the second seal, and the elastic modulus of the first seal is lower than that of the second seal. On the cathode side of the membrane electrode, the materials for the first and second seals are selected to have low hydrogen permeation concentration. On the anode side of the membrane electrode, the first and second seals are made of antioxidant materials.

[0015] Secondly, the present invention also provides a mold for molding a sealing structure having a double-seal composition, comprising a first mold, a second mold, and a third mold. The first mold has a first groove on one side facing the second mold. A first cavity and a second cavity are sequentially arranged in the first groove. The first mold has a first active area on one side of the second cavity. The second mold has a second active area that can be opposite to the first active area. The second mold has a continuous third serrated segment on one side of the second active area. The second active area is positioned below the third serrated segment. A straight segment is provided on the side of the third serrated segment near the second active area to support the side of the membrane electrode. The length of the third serrated segment is adapted to the length of the first groove. The third mold and the first mold have the same structure and can be arranged opposite each other.

[0016] As described above, a mold with a sealing structure consisting of two seals is provided. The third mold is provided with a second groove on the side facing the first mold. A third cavity and a fourth cavity are sequentially provided in the second groove. The third cavity and the fourth cavity are spaced apart. The third mold is provided with a third active area on the side of the fourth cavity away from the third cavity. The third active area can be positioned opposite to the first active area. A second step is provided between the third active area and the fourth cavity. The third cavity is semi-circular, and the fourth cavity is rectangular. The depth of the fourth cavity is less than the depth of the third cavity.

[0017] As described above, a mold with a sealing structure consisting of two seals is provided. The first mold is provided with a first injection hole, which is arranged along the height direction of the first mold and communicates with the first groove. The third mold is provided with a second injection hole, which is arranged at an angle relative to the third mold and communicates with the second groove. A first sealing material is injected through the first injection hole, and a second sealing material is injected through the second injection hole.

[0018] As described above, a mold with a sealing structure consisting of two seals has a first cavity that is semi-circular and a second cavity that is rectangular. The depth of the second cavity is lower than the depth of the first cavity. The second cavity and the first cavity are spaced apart. A first step is provided between the second cavity and the first active area. The membrane electrode is positioned by the first step. The width of the first step is less than the length of the straight section.

[0019] Thirdly, the present invention also provides a molding method for a sealing structure having a dual-seal composition, using the aforementioned mold for a sealing structure having a dual-seal composition, comprising the following: Place the membrane electrode in the second active area of ​​the second mold, and then cover it with the first mold; The first sealing material is injected into the first space between the first mold and the second mold. After the first sealing material is cured, it forms a first sealing element, which is bonded to the side of the membrane electrode. Remove the second mold, place the third mold below the first mold, and inject the second sealing material into the second space between the third mold and the first seal. After the second sealing material cures, it forms the second seal. Demold the membrane electrode with the sealed structure.

[0020] The beneficial effects of the present invention are as follows: In this invention, the first and second sealing elements are two sets of sealing elements, formed through different processes. The first sealing element supports the edges of the membrane electrode during its forming process, and the second sealing element also supports the edges of the membrane electrode during its forming process. This prevents the membrane electrode from having any suspended parts during the sealing structure forming process and avoids significant impact on the sealing material due to the integrally formed sealing elements. This effectively avoids large deformation of the membrane electrode edges and ensures the contact area between the membrane electrode and the sealing structure. The first and second sealing elements contact each other through a continuous serrated structure, effectively increasing the contact area between them. This ensures the strength of the interface layer between the two sealing elements, improving the toughness of the sealing structure, reducing lateral permanent compression deformation, thereby reducing longitudinal permanent compression deformation and minimizing the attenuation of the sealing force.

[0021] The mold in this invention includes a first mold, a second mold, and a third mold. A straight section is provided on one side of the third serrated section of the second mold. During the molding process of the first sealant, the membrane electrode is placed at the first active region and the second active region, and the side of the membrane electrode is supported by the straight section. This provides reliable and stable support to the side of the membrane electrode during the injection of the first sealing material, preventing the side of the membrane electrode from being suspended, avoiding the high-pressure and high-speed first sealing material from scouring the side of the membrane electrode, and preventing deformation of the side of the membrane electrode. During the injection of the first sealing material, the already formed second sealing material supports the side of the membrane electrode, preventing any suspended portion on the side of the membrane electrode, thereby preventing the high-pressure and high-speed second sealing material from scouring the side of the membrane electrode, and further preventing deformation of the side of the membrane electrode. Attached Figure Description

[0022] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0023] Figure 1 This is a schematic diagram of the connection between the membrane electrode and the existing sealing structure in the prior art.

[0024] Figure 2 This is a schematic diagram illustrating the deformation problem of membrane electrodes in existing technologies.

[0025] Figure 3 This is a schematic diagram of a sealing structure with a double-seal composition according to Embodiment 1 of the present invention. Figure 1 .

[0026] Figure 4 This is a schematic diagram of a sealing structure with a double-seal composition according to Embodiment 1 of the present invention. Figure 2 .

[0027] Figure 5 This is the present invention. Figure 4 Enlarged view of the structure at point A in the middle.

[0028] Figure 6 This is a schematic diagram of the sawtooth structure in a sealing structure with a double-seal composition according to Embodiment 2 of the present invention. Figure 1 .

[0029] Figure 7 This is a schematic diagram of the sawtooth structure in a sealing structure with a double-seal composition according to Embodiment 2 of the present invention. Figure 2 .

[0030] Figure 8 This is an exploded view of the first mold and the second mold in a mold for forming a sealing structure with a double seal, according to one or more embodiments of the present invention, when they are engaged.

[0031] Figure 9 This is a schematic diagram of a third mold in a mold for molding a sealing structure having a double-seal composition, according to one or more embodiments of the present invention.

[0032] Figure 10 This is a step diagram of a molding method for a sealing structure having a double-seal composition according to one or more embodiments of the present invention.

[0033] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0034] Wherein: 1. Membrane electrode, 2. Sealing structure, 3. Deformed membrane electrode side, 4. First seal, 5. Second seal, 6. First serrated segment, 7. Second serrated segment, 8. Second protrusion, 9. First protrusion, 10. First mold, 11. First cavity, 12. Third serrated segment, 13. Second mold, 14. Second active area, 15. First active area, 16. Straight segment, 17. Second cavity, 18. Third mold, 19. Third active area, 20. Fourth cavity, 21. Third cavity, 22. Protruding area, 23. Recessed area. Detailed Implementation

[0035] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. As described in the background section, the suspended portion on the side of the membrane electrode is prone to deformation during injection molding in the prior art. In order to solve the above technical problem, the present invention proposes a sealing structure with a double seal.

[0037] Example 1 In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a sealing structure with dual seals includes a first seal 4 and a second seal 5. The first seal 4 and the second seal 5 are formed through different processes. During the forming process of the first seal 4, one side of the membrane electrode is supported. During the forming process of the second seal 5, the first seal 4 supports the other side of the membrane electrode. The first seal 4 and the second seal 5 are positioned opposite and in contact. The first seal 4 and the second seal 5 are in contact through a continuous serrated structure to improve the toughness of the sealing structure. The side of component 5 (the side closest to the membrane electrode) is provided with a straight area. The length of the straight area is slightly less than the length of the side of the membrane electrode 1, which can ensure that the straight area is in full contact with the side of the membrane electrode 1 and ensure the overall durability. The first sealing component 4 and the second sealing component 5 are both injection molded to connect with the side of the membrane electrode 1. The serrated structure includes a first serrated segment 6 and a second serrated segment 7. The first serrated segment 6 and the second serrated segment 7 mesh with each other. The first serrated segment 6 is provided on the sealing surface of the first sealing component 4, and the second serrated segment 7 is provided on the sealing surface of the second sealing component 5.

[0038] The sealing structure described above includes a first sealing element 4 and a second sealing element 5. The first sealing element 4 and the second sealing element 5 are in contact through a continuous serrated structure, which effectively increases the contact area between the first sealing element 4 and the second sealing element 5. This ensures the strength of the interface layer between the two sealing elements, thereby improving the toughness of the sealing structure, reducing lateral permanent compression deformation, and thus reducing longitudinal permanent compression deformation and reducing the attenuation of sealing force. Because the first sealing element 4 and the second sealing element 5 are two sets of sealing elements, which are formed through different processes, the sealing material will not be subjected to a large impact due to the integrally formed sealing element. This effectively avoids the problem of large deformation on the edge of the membrane electrode and ensures the contact area between the membrane electrode and the sealing structure.

[0039] refer to Figure 3 , Figure 4 and Figure 5 As shown, the first serrated segment 6 includes a first protrusion 9 and a first concave portion. The first protrusion 9 and the first concave portion are alternately arranged to form a periodic first serrated segment 6. The area of ​​the first protrusion 9 is larger than the area of ​​the first concave portion. The second serrated segment 7 includes a second protrusion 8 and a second concave portion, which are alternately arranged. The height of the second protrusion 8 is less than the depth of the second concave portion. The second protrusion 8 is engaged in the first concave portion, and the first protrusion 9 is engaged in the second concave portion. That is, the size of the second protrusion 8 is adapted to the size of the first concave portion, and the size of the second concave portion is adapted to the size of the first protrusion 9. This makes the area of ​​the first protrusion 9 larger than the area of ​​the second protrusion 8, effectively ensuring the contact area of ​​the interface between the first seal 4 and the second seal 5. In addition, the creep resistance of the first seal 4 (referring to the ability of a material to resist slow plastic deformation (i.e., creep) and fracture over time under high temperature and constant stress) is better than that of the second seal 5. The creep of the second seal 5 can be effectively suppressed by the first seal 4, thereby improving the creep resistance of the overall sealing structure. In addition, the elastic modulus of the first seal 4 (referring to the material's resistance to elastic deformation) is less than that of the second seal 5. After the first toothed segment 6 and the second toothed segment 7 mesh, the elastic deformation capacity of the second protrusion 8 is stronger than that of the first protrusion 9, which can improve the compressibility of the sealing structure and thus increase the compression of the overall sealing structure.

[0040] In this embodiment, considering the need to ensure the structural area of ​​the first sealing element 4 and the second sealing element 5, the shape of the first concave part is trapezoidal and the shape of the first convex part 9 is inverted trapezoidal. The trapezoidal and inverted trapezoidal structural settings can also ensure the meshing ability of the first serrated segment 6 and the second serrated segment 7. In other examples, the first seal 4 and the second seal 5 may also be serrated or have other structural forms.

[0041] Specifically, to ensure the toughness of the sealing structure, the height of the first protrusion 9 is 2-4 times the depth of the first recess, and the maximum width of the first recess is greater than the maximum width of the first protrusion 9. This ensures the contact area between the first serrated segment 6 and the second serrated segment 7, and ensures the interface strength between the first seal 4 and the second seal 5.

[0042] It should be noted that, in response to the difference in cathode and anode gases on both sides of the membrane electrode, a more suitable sealing material is selected. The materials of the first sealing element 4 and the second sealing element 5 may be the same or different. The two sealing materials can provide a function that a single sealing material cannot achieve. On the cathode side of the membrane electrode, the materials of the first sealing element 4 and the second sealing element 5 are selected as low hydrogen permeation concentration materials, such as EPDM (ethylene propylene diene monomer rubber). On the anode side of the membrane electrode, the materials of the first sealing element 4 and the second sealing element 5 are selected as antioxidant materials, such as silicone.

[0043] The sealing structure provided in this embodiment has a continuous serrated structure between the first sealing element 4 and the second sealing element 5, which creates an interface layer between the two sealing elements. The interface layer has high strength, ensuring the contact area between the first sealing element 4 and the second sealing element 5, and can effectively prevent the mutual migration of gas absorbed by the materials on both sides. The high strength of the interface layer between the two sealing materials can improve the toughness of the sealing materials, reduce the permanent compression deformation in the lateral direction, thereby reducing the permanent compression deformation in the longitudinal direction and reducing the attenuation of the sealing force. Moreover, the serrated interface can further increase the interface length and enhance the positive effect of the interface.

[0044] Example 2 The difference between this embodiment and Embodiment 1 is that: refer to Figure 6 and Figure 7 As shown, the first serrated segment includes multiple continuous raised areas 22, which are inverted V-shaped. The raised areas 22 include multiple continuous protruding steps, which can be segments. There are two steps on each side of the middle step. The second serrated segment includes multiple continuous recessed areas 23, which are V-shaped. The shape of the recessed areas 23 matches the shape of the raised areas 22. The steps are curved steps or straight steps.

[0045] In addition, the first seal 4 and the second seal 5 have different hardnesses. For a straight interface, the contact stress distribution between the seal and the electrode is uneven, showing a distribution pattern with the highest stress in the middle and the lowest stress on both sides. This makes the electrode and sealing material in the high-stress area more prone to damage or shorter life. The material with high hardness is concave in shape, while the material with low hardness is convex in shape. The material with low hardness accounts for a larger proportion in the middle, which reduces the stress. The material with high hardness accounts for a larger proportion on both sides, which increases the stress. Multiple steps can be set from the center to both sides to improve the uniformity of stress distribution. The radius of the arc step in the arc step is >90°, which makes the stress distribution more uniform and the transition smoother.

[0046] Example 3 A mold for molding a sealing structure with a double-seal composition as described in Embodiment 1, referenced Figure 8 , Figure 9 As shown, the device includes a first mold 10, a second mold 13, and a third mold 18. The first mold 10 has a first groove on the side facing the second mold 13. A first cavity 11 and a second cavity 17 are sequentially arranged in the first groove. The first mold 10 has a first active area 15 on the side of the second cavity 17 away from the first cavity 11. The second mold 13 has a second active area 14 that can be opposite to the first active area 15. The second mold 13 has a continuous third serrated segment 12 on one side of the second active area 14. The second active area 14 is set below the third serrated segment 12. A straight segment 16 is provided on the side of the third serrated segment 12 near the second active area to support the side of the membrane electrode. The length of the third serrated segment 12 is adapted to the length of the first groove to ensure the smooth forming of the first sealing element 4. The third mold 18 has the same structure as the first mold 10 and the third mold 18 and the first mold 10 can be arranged opposite each other.

[0047] Moreover, the structure of the third serrated segment 12 is the same as that of the second serrated segment, and the shapes of the third convex part and the third concave part in the third serrated segment 12 are the same as those of the second convex part and the second concave part.

[0048] As described above, in the mold, a straight section 16 is provided on one side of the third serrated section 12 in the second mold 13. During the molding process of the first sealant, the membrane electrode 1 is placed at the first active area 15 and the second active area 14. The side of the membrane electrode is supported by the straight section 16. In this way, during the injection of the first sealing material, the straight section 16 provides reliable and stable support to the side of the membrane electrode 1, avoiding the membrane electrode side from being suspended, avoiding the high pressure and high speed of the first sealing material from scouring the side of the membrane electrode, and avoiding deformation of the side of the membrane electrode. During the injection of the first sealing material, the side of the membrane electrode is supported by the already formed second sealing material, avoiding any suspended part on the side of the membrane electrode, thereby avoiding the high pressure and high speed of the second sealing material from scouring the side of the membrane electrode, and further avoiding deformation of the side of the membrane electrode.

[0049] It is easy to understand that the widths of the first mold 10, the second mold 13, and the third mold 18 can be the same or different. During use, the second mold 13 is usually at the bottom and the first mold 10 is at the top. After the first seal 4 is cured and formed, the second mold 13 is removed and replaced by the third mold 18 to facilitate the formation of the second seal 5.

[0050] Specifically, the third mold 18 has a second groove on the side facing the first mold 10, which is opposite to the first groove. The second groove is designed to accommodate the second sealing material. A third cavity 21 and a fourth cavity 20 are sequentially arranged in the second groove, with a distance between them. The third mold 18 has a third active area 19 on the side of the fourth cavity 20 away from the third cavity 21. The third active area 19 is opposite to the first active area 15. A second step is provided between the third active area 19 and the fourth cavity 20, and the width of the second step is the same as the width of the first step. It should be noted that the third cavity 21 is semi-circular, the fourth cavity 20 is rectangular, and the depth of the fourth cavity 20 is lower than the depth of the third cavity 21.

[0051] It is easy to understand that the first mold 10 is provided with a first injection hole, which is set along the height direction of the first mold 10 and is connected to the first groove. The third mold 18 is provided with a second injection hole, which is set at an angle relative to the upper surface of the third mold 18 and is connected to the second groove. The first sealing material is injected through the first injection hole and the second sealing material is injected through the second injection hole. If the second injection hole is at the bottom of the third mold 18, the liquid may not be able to be injected into the second groove during the injection process.

[0052] Specifically, the first cavity 11 is semi-circular, the second cavity 17 is rectangular, the depth of the second cavity 17 is lower than the depth of the first cavity 11, the second cavity 17 and the first cavity 11 are spaced apart, and a first step is provided between the second cavity 17 and the first active area 15. The membrane electrode 1 is positioned by the first step. The width of the first step is less than the length of the straight section 16. After the membrane electrode 1 is positioned by the first step, the side of the membrane electrode extends beyond the first step. Moreover, considering the adhesion between the first seal and the side of the membrane electrode, the height of the straight section 16 is less than the height of the third protrusion.

[0053] In addition, during actual production, the first mold 10 can be connected to the moving mold of the injection molding machine, and the second mold 13 and the third mold 18 can be detachably connected to the fixed mold of the injection molding machine (through bolts or other structural components) to enable the replacement of the second mold 13 and the third mold 18.

[0054] The mold provided in this embodiment can realize the forming of membrane electrode and sealing structure. During the forming process of the first sealing member 4, the straight section 16 of the second mold supports one side of the membrane electrode. During the forming process of the second sealing member 5, the first sealing member 4 supports the other side of the membrane electrode. In this way, the first sealing member 4 and the second sealing member 5 can generate spatial steric hindrance to the membrane electrode during their respective forming processes, preventing the membrane electrode from deforming.

[0055] Example 4 A molding method for a sealing structure with dual seals, using a mold with dual seals as described in Example 1 or Example 2, with reference to... Figure 10 As shown, it includes the following: The membrane electrode 1 is placed in the second active area 14 of the second mold 13, and the first mold 10 is covered. The first active area 15 of the first mold 10 is placed on the upper side of the membrane electrode 1. The bottom of the side of the membrane electrode is supported by the straight section 16 of the second mold and extends beyond the first step into the second cavity. The first sealing material (liquid) is injected into the first space between the first mold 10 and the second mold 13. After the first sealing material is cured, it forms the first sealing element 4, which is bonded to the side of the membrane electrode. Remove the second mold 13, place the third mold 18 below the first mold 10, and ensure that the upper side of the membrane electrode side is in full contact with the first seal 4. Inject the second sealing material into the second space between the third mold 18 and the first seal 4. After the second sealing material is cured, the second seal 5 is formed. Demold the membrane electrode with the sealed structure.

[0056] The method provided in this embodiment enables the molding of a sealing structure with dual seals. During the molding process, the first sealing element 4 and the second sealing element 5 are molded separately, avoiding the erosion of the membrane electrode side caused by the integrally molded structure and avoiding deformation of the membrane electrode side. This effectively ensures the structural strength of the sealing structure at the interface after molding and guarantees the sealing performance of the sealing structure.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A sealing structure comprising two seals, characterized in that, The device includes a first seal and a second seal, which are formed separately through different processes. During the forming process of the first seal, one side of the membrane electrode is supported. During the forming process of the second seal, the first seal supports the other side of the membrane electrode. The first and second seals are positioned opposite each other and in contact. The first and second seals are in contact through a continuous serrated structure to improve the toughness of the sealing structure. Both the first and second seals are in contact with the side of the membrane electrode. Both the first and second seals are connected to the side of the membrane electrode by injection molding. The serrated structure includes a first serrated segment and a second serrated segment, which mesh with each other. The first serrated segment is located on the sealing surface of the first seal, and the second serrated segment is located on the sealing surface of the second seal.

2. The sealing structure with a double-seal composition according to claim 1, characterized in that, The first serrated segment includes a first protrusion and a first concave portion, the first protrusion and the first concave portion are alternately arranged, and the area of ​​the first protrusion is larger than the area of ​​the first concave portion; The second serrated segment includes a second convex portion and a second concave portion, which are alternately arranged. The height of the second convex portion is less than the depth of the second concave portion. The second convex portion is engaged in the first concave portion, and the first convex portion is engaged in the second concave portion.

3. A sealing structure with a double-seal composition according to claim 2, characterized in that, The first concave portion is trapezoidal in shape, and the first convex portion is inverted trapezoidal in shape; The height of the first protrusion is 2-4 times the depth of the first concave portion.

4. A sealing structure with a double-seal composition according to claim 2, characterized in that, The maximum width of the first recess is greater than the maximum width of the first protrusion.

5. A sealing structure with a double-seal composition according to claim 1, characterized in that, The first serrated segment includes multiple continuous raised areas, the raised areas being inverted V-shapes, and the raised areas including multiple continuous protruding steps; the second serrated segment includes multiple continuous recessed areas, the recessed areas being V-shapes, and the steps being arc-shaped steps or straight steps.

6. A sealing structure with a double-seal composition according to claim 1, characterized in that, The first seal and the second seal are made of the same or different materials. The creep resistance of the first seal is better than that of the second seal. The elastic modulus of the first seal is lower than that of the second seal. On the cathode side of the membrane electrode, the first and second sealing elements are made of materials with low hydrogen permeation concentration. On the anode side of the membrane electrode, the first and second seals are made of antioxidant materials.

7. A mold for molding a sealing structure having a double-seal composition as described in any one of claims 1-6, characterized in that, The device includes a first mold, a second mold, and a third mold. The first mold has a first groove on one side facing the second mold. A first cavity and a second cavity are sequentially arranged in the first groove. The first mold has a first active area on one side of the second cavity. The second mold has a second active area that is opposite to the first active area. The second mold has a continuous third serrated segment on one side of the second active area. The second active area is positioned below the third serrated segment. A straight section is provided on the side of the third serrated segment near the second active area to support the side of the membrane electrode. The length of the third serrated segment is adapted to the length of the first groove. The third mold and the first mold have the same structure and can be arranged opposite each other.

8. The mold according to claim 7, characterized in that, The third mold is provided with a second groove on the side facing the first mold. A third cavity and a fourth cavity are sequentially provided in the second groove. The third cavity and the fourth cavity are spaced apart. The third mold is provided with a third active area on the side of the fourth cavity away from the third cavity. The third active area can be arranged opposite to the first active area. A second step is provided between the third active area and the fourth cavity. The third cavity is semi-circular, and the fourth cavity is rectangular. The depth of the fourth cavity is less than the depth of the third cavity.

9. The mold according to claim 8, characterized in that, The first mold is provided with a first injection hole, which is set along the height direction of the first mold and is connected to the first groove. The third mold is provided with a second injection hole, which is set at an angle relative to the third mold and is connected to the second groove. A first sealing material is injected through the first injection hole and a second sealing material is injected through the second injection hole.

10. The mold according to claim 7, characterized in that, The first cavity is semi-circular, the second cavity is rectangular, the depth of the second cavity is lower than the depth of the first cavity, the second cavity and the first cavity are spaced apart, and a first step is provided between the second cavity and the first active area. The membrane electrode is positioned by the first step, and the width of the first step is less than the length of the straight section.

11. A molding method for a sealing structure having a double-seal component, characterized in that, The mold used in any one of claims 6-10 includes the following: Place the membrane electrode in the second active area of ​​the second mold, and then cover it with the first mold; The first sealing material is injected into the first space between the first mold and the second mold. After the first sealing material is cured, it forms a first sealing element, which is bonded to the side of the membrane electrode. Remove the second mold, place the third mold below the first mold, and inject the second sealing material into the second space between the third mold and the first seal. After the second sealing material cures, it forms the second seal. Demold the membrane electrode with the sealed structure.

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