Sealing structure for polar plate, polar plate and fuel cell

Abstract

The utility model discloses a sealing structure for polar plate, polar plate and fuel cell, at least one side of polar plate is provided with a sealing groove, the sealing structure comprises: adhesive layer and sealing layer, adhesive layer is suitable for being arranged in the sealing groove and is fixedly connected with polar plate, adhesive layer and sealing layer overlap and are fixedly connected, the sealing layer is located on the side, away from the bottom wall of the sealing groove, of the adhesion layer. Therefore, the adhesion layer and the sealing layer are stacked and fixedly connected, so that the adhesion layer and the sealing layer can be quickly crosslinked and diffused in the curing process, and then the interface areas of the adhesion layer and the sealing layer quickly react to form covalent bonds, so that the bonding strength of the adhesion layer and the sealing layer is effectively improved; and the adhesion layer is arranged in the sealing groove and is fixedly connected with the polar plate, so that the bonding strength between the polar plate and the sealing structure is improved, and the sealing performance, the safety and the reliability of the fuel cell are further improved.

Description

Technical Field

[0001] The utility model relates to the field of fuel cells, in particular to a sealing structure for a polar plate, a polar plate and a fuel cell. Background Art

[0002] In the related art, a fuel cell is composed of a plurality of unit cells connected in series, each of which includes a plate, a membrane electrode assembly (MEA) and a seal. The plate includes an anode plate and a cathode plate, and the membrane electrode assembly is sandwiched between the anode plate and the cathode plate. There is a need for sealing between the anode plate and the cathode plate, between the anode plate and the membrane electrode assembly, and between the cathode plate and the membrane electrode assembly. The seal can not only prevent fluid leakage, but also help maintain appropriate temperature and humidity for optimal performance. Therefore, the sealing effect of the unit cell has an important impact on the safety, durability, performance and cost-effectiveness of the proton exchange membrane fuel cell. However, the existing sealant has weak adhesion on the plate, resulting in poor sealing effect, which is a big problem. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a sealing structure for a plate, which can effectively improve the bonding strength between the plate and the sealing structure, thereby improving the sealing performance, safety and reliability of the fuel cell.

[0004] The utility model further proposes a pole plate having the above sealing structure for the pole plate.

[0005] The utility model further proposes a fuel cell having the above-mentioned electrode plate.

[0006] According to the sealing structure for the electrode plate of the embodiment of the utility model, a sealing groove is formed on at least one side of the electrode plate, and the sealing structure includes: an adhesion layer and a sealing layer, the adhesion layer is suitable for being arranged in the sealing groove and being fixedly connected to the electrode plate, the adhesion layer and the sealing layer are stacked and fixedly connected, and the sealing layer is located on the side of the adhesion layer away from the bottom wall of the sealing groove.

[0007] According to the sealing structure for the electrode plate of the embodiment of the utility model, by stacking and fixing the adhesion layer and the sealing layer, the adhesion layer and the sealing layer can be quickly cross-linked and diffused during the curing process, so that the interface area between the adhesion layer and the sealing layer quickly reacts to form a covalent bond, thereby effectively improving the bonding strength between the adhesion layer and the sealing layer. The adhesion layer is arranged in the sealing groove and fixedly connected to the electrode plate, thereby improving the bonding strength between the electrode plate and the sealing structure, thereby improving the sealing performance, safety and reliability of the fuel cell.

[0008] According to some embodiments of the present invention, the surface energy of the adhesion layer is greater than the surface energy of the sealing layer.

[0009] According to some embodiments of the present invention, the adhesion layer includes a polymer, and the sealing layer includes a sealant.

[0010] According to some embodiments of the present invention, the thickness dimension of the adhesion layer is D, which satisfies the relationship: 30 μm≤D≤80 μm.

[0011] According to some embodiments of the present invention, the adhesive layer is configured as a thermosetting adhesive layer.

[0012] The electrode plate according to the embodiment of the utility model includes an electrode plate body, at least one side of which is formed with a sealing groove; and also includes the sealing structure of the above embodiment, wherein an adhesion layer is arranged in the sealing groove and is fixedly connected to the electrode plate, the adhesion layer and the sealing layer are stacked and fixedly connected, and the sealing layer is located on the side of the adhesion layer away from the bottom wall of the sealing groove.

[0013] According to some embodiments of the present invention, the sealing groove has two opposite and spaced apart groove side walls, the groove bottom wall is connected between the two groove side walls, and the spacing distance between the two groove side walls gradually increases from the groove bottom wall to the open end of the groove bottom wall.

[0014] According to some embodiments of the present invention, both groove side walls are configured as inclined walls, and both groove side walls are inclined toward the outside of the sealing groove.

[0015] According to some embodiments of the present invention, the electrode body is a graphite electrode.

[0016] A fuel cell according to an embodiment of the utility model includes the electrode plate of the above embodiment.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the assembly of the electrode plate and the sealing structure of the embodiment of the utility model;

[0020] Figure 2 yes Figure 1 Schematic diagram of the interpenetrating network of the electrode, adhesion layer and sealing layer at A in the middle.

[0021] Reference numerals:

[0022] Plate 100;

[0023] Plate body 10; sealing groove 11; groove side wall 12; groove bottom wall 13;

[0024] Adhesion layer 20; sealing layer 30; sealing structure 40. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] Reference below Figure 1 and Figure 2 The sealing structure 40 for the electrode plate 100 , the electrode plate 100 , and the fuel cell according to the embodiment of the present invention are described.

[0027] like Figure 1 and Figure 2 As shown, according to the sealing structure 40 for the electrode 100 of the embodiment of the utility model, a sealing groove 11 is formed on at least one side of the electrode 100. The sealing structure 40 includes: an adhesive layer 20 and a sealing layer 30, the adhesive layer 20 is suitable for being arranged in the sealing groove 11 and fixedly connected to the electrode 100, the adhesive layer 20 and the sealing layer 30 are overlapped and fixedly connected, and the sealing layer 30 is located on the side of the adhesive layer 20 away from the groove bottom wall 13 of the sealing groove 11.

[0028] Among them, the electrode plate 100 can be a cathode plate or an anode plate. Along the thickness direction of the electrode plate 100, a sealing groove 11 is formed on at least one side of the electrode plate 100. For example, a sealing groove 11 can be formed on one side of the electrode plate 100, or a sealing groove 11 is formed on both sides of the electrode plate 100. Specifically, the sealing groove 11 can be reasonably set according to the specific structural form of the electrode plate 100, and no specific limitation is made here, as long as it can meet the normal use of the electrode plate 100.

[0029] The sealing structure 40 includes: an adhesion layer 20 and a sealing layer 30. The adhesion layer 20 can be selected from thermosetting resins containing resins with functional groups containing active hydrogen, such as thermosetting acrylate resins. Thermosetting resins are high molecular polymer materials, and their molecular chains can form a rigid three-dimensional network structure through chemical cross-linking. It has the advantages of high strength, good heat resistance, excellent electrical properties, corrosion resistance, aging resistance, and good dimensional stability. The adhesion layer 20 is suitable for being arranged in the sealing groove 11 and fixedly connected to the electrode 100, thereby improving the mechanical strength of the electrode 100 in the sealing groove 11 area, thereby improving the safety and reliability of the fuel cell. The sealing layer 30 can be a UV and moisture curing system, for example, the sealing layer 30 can be an alkoxy- or ethoxy-containing silicone, both of which contain acrylate compounds as resin system crosslinkers. As a result, the resin crosslinker component in the sealing layer 30 will diffuse into the adhesion layer 20, and the adhesion layer 20 will be further cross-linked. A covalent bond is formed in the interface area between the sealing layer 30 and the adhesion layer 20, thereby improving the bonding strength between the adhesion layer 20 and the sealing layer 30.

[0030] The adhesion layer 20 and the sealing layer 30 are stacked and fixedly connected, and the sealing layer 30 is located on the side of the adhesion layer 20 away from the bottom wall 13 of the sealing groove 11. Specifically, in the process of improving the bonding strength between the electrode plate 100 and the sealing layer 30, the adhesion layer 20 can be first printed in the sealing groove 11, and further, the electrode plate 100 is moved to a conveyor oven for thermal curing or ultraviolet curing, and then the sealing layer 30 is applied on the adhesion layer 20, and finally the electrode plate 100 is placed under ultraviolet or heating conditions for curing and sealing. During the curing process, the atoms of the adhesion layer 20 and the sealing layer 30 will diffuse and penetrate each other until the curing is completed, thereby completing the sealing of the electrode plate 100. It can be explained that compared with the electrode plate 100, the adhesion layer 20 has a higher surface energy. Applying the sealing layer 30 on the adhesion layer 20 can make the sealing layer 30 have better wettability and stronger van der Waals force, which is conducive to improving the bonding strength between the adhesion layer 20 and the sealing layer 30, thereby improving the bonding strength between the electrode plate 100 and the sealing layer 30.

[0031] Furthermore, if Figure 2 As shown, the sealing layer 30 can also be a heat-curing or UV-curing polyolefin-based material, and the resin can also be a thermosetting polymer containing aliphatic primary amines, such as an acrylic epoxy system, and the curing of the adhesion layer 20 can be a combination of addition curing, UV curing and heat curing, which can make the sealing layer 30 and the adhesion layer 20 cure at the same time, thereby expanding the interpenetrating network layer between the sealing layer 30 and the adhesion layer 20, and forming more covalent bonds at the interface between the sealing layer 30 and the adhesion layer 20, thereby further improving the bonding strength between the adhesion layer 20 and the sealing layer 30, thereby further improving the bonding strength between the electrode 100 and the sealing layer 30.

[0032] Therefore, if Figure 2 As shown, by arranging an adhesion layer 20 in the sealing groove 11, and the mutual diffusion, adsorption and chemical bonding between the adhesion layer 20 and the sealing layer 30 can greatly improve the bonding strength between the adhesion layer 20 and the sealing layer 30, thereby improving the bonding strength between the electrode plate 100 and the sealing layer 30, and arranging the adhesion layer 20 in the sealing groove 11 can also improve the mechanical strength of the electrode plate 100 in the sealing groove 11 area, thereby improving the sealing performance, safety and reliability of the fuel cell.

[0033] It can be explained that the processing steps of the adhesion layer 20 and the sealing layer 30 can be performed in sequence or overlapped.

[0034] According to the sealing structure 40 of the embodiment of the utility model, by stacking and fixing the adhesion layer 20 and the sealing layer 30, the adhesion layer 20 and the sealing layer 30 can be quickly cross-linked and diffused during the curing process, so that the interface area of ​​the adhesion layer 20 and the sealing layer 30 can quickly react to form a covalent bond, thereby effectively improving the bonding strength between the adhesion layer 20 and the sealing layer 30, and the adhesion layer 20 is arranged in the sealing groove 11 and fixedly connected to the electrode plate 100, thereby improving the bonding strength between the electrode plate 100 and the sealing structure 40, thereby improving the sealing performance, safety and reliability of the fuel cell.

[0035] According to some embodiments of the present invention, the surface energy of the adhesion layer 20 is greater than the surface energy of the sealing layer 30. Applying the sealing layer 30 on the adhesion layer 20 can make the sealing layer 30 have better wettability and stronger van der Waals force, which is beneficial to improve the bonding strength between the adhesion layer 20 and the sealing layer 30, thereby improving the bonding strength between the electrode 100 and the sealing structure 40.

[0036] According to some embodiments of the present invention, the adhesion layer 20 includes a polymer, for example, the adhesion layer 20 may include a thermosetting acrylate resin, a thermosetting polymer containing aliphatic primary amines, and the like. The sealing layer 30 includes a sealant, for example, the sealing layer 30 may include a sealant such as alkoxy- or ethoxy-containing silicone. In this way, the interpenetrating network layer between the sealing layer 30 and the adhesion layer 20 can be expanded, and more covalent bonds can be formed at the interface between the sealing layer 30 and the adhesion layer 20, thereby further improving the bonding strength between the adhesion layer 20 and the sealing layer 30, thereby further improving the bonding strength between the plate 100 and the sealing layer 30, and further improving the bonding strength between the plate 100 and the sealing layer 30, and further improving the bonding strength between the plate 100 and the sealing structure 40.

[0037] According to some embodiments of the present invention, Figure 1As shown, part of the sealing layer 30 is located in the sealing groove 11, for example, one-half of the sealing layer 30 may be located in the sealing groove 11, or one-third of the sealing layer 30 may be located in the sealing groove 11, but the utility model is not limited thereto, and other proportions of the sealing layer 30 may be located in the sealing groove 11, as long as part of the sealing layer 30 is located in the sealing groove 11. The part of the sealing layer 30 located in the sealing groove 11 can form a covalent bond between the sealing layer 30 and the adhesion layer 20 in the sealing groove 11, thereby improving the bonding strength between the sealing layer 30 and the adhesion layer 20, thereby improving the bonding strength between the electrode plate 100 and the sealing structure 40.

[0038] According to some embodiments of the present invention, Figure 1 As shown, the sealing layer 30 is connected to the electrode 100. Specifically, the sealing layer 30 is indirectly connected to the electrode 100 through the adhesion layer 20, or the sealing layer 30 is directly connected to the electrode 100. The adhesion layer 20 and the sealing layer 30 are overlapped and fixedly connected. The sealing layer 30 is located on the side of the adhesion layer 20 away from the bottom wall 13 of the sealing groove 11, that is, the sealing layer 30 is fixedly connected to the adhesion layer 20, and the adhesion layer 20 is arranged in the sealing groove 11 of the electrode body 10, thereby realizing the fixed connection between the sealing layer 30 and the electrode 100, and then realizing the sealing of the electrode 100.

[0039] According to some embodiments of the present invention, Figure 1 As shown, the thickness dimension D of the adhesion layer 20 can be D, which satisfies the relationship: 30μm≤D≤80μm, that is, the thickness dimension D of the adhesion layer 20 can be 30μm, 80μm, or any value between 30μm-80μm, for example: the thickness dimension D of the adhesion layer 20 can be 30μm, 31μm, 68μm, 75μm, 80μm and other values, but the utility model is not limited thereto, the thickness dimension D of the adhesion layer 20 can also be other values ​​between 30μm-80μm, as long as the thickness dimension D of the adhesion layer 20 is 30μm, 80μm, or a value between 30μm-80μm. Setting the thickness dimension D of the adhesion layer 20 to satisfy the relationship: 30μm≤D≤80μm can improve the surface energy of the adhesion layer 20, thereby improving the bonding strength between the adhesion layer 20 and the sealing layer 30.

[0040] It can be explained that the specific value of the thickness of the adhesion layer 20 can be reasonably set and adjusted according to actual conditions.

[0041] According to some embodiments of the utility model, the adhesion layer 20 can be constructed as a thermosetting adhesion layer, for example: the adhesion layer 20 can be constructed as a thermosetting acrylate resin, which is a high molecular polymer material. Its molecular chains can form a rigid three-dimensional network structure through chemical cross-linking. It has the advantages of high strength, good heat resistance, excellent electrical properties, corrosion resistance, aging resistance, and good dimensional stability. The adhesion layer 20 is arranged in the sealing groove 11 and fixedly connected to the electrode 100, so as to improve the mechanical strength of the electrode 100 in the sealing groove 11 area, thereby improving the safety and reliability of the fuel cell.

[0042] Furthermore, adding the thermosetting adhesion layer 20 in the sealing groove 11 can be a rapid and continuous process, which is more efficient, more effective, and more economical than the existing method of improving the bonding strength between the electrode plate 100 and the sealing layer.

[0043] The electrode plate 100 according to the embodiment of the utility model includes a electrode plate body 10, and a sealing groove 11 is formed on at least one side of the electrode plate body 10; it also includes the sealing structure 40 of the above-mentioned embodiment, and the sealing structure 40 is the sealing structure 40 for the electrode plate 100 mentioned above, and the adhesion layer 20 is arranged in the sealing groove 11 and is fixedly connected to the electrode plate 100, and the adhesion layer 20 and the sealing layer 30 are overlapped and fixedly connected, and the sealing layer 30 is located on the side of the adhesion layer 20 away from the groove bottom wall 13 of the sealing groove 11.

[0044] Among them, the electrode plate 100 can be a cathode plate or an anode plate, and a sealing groove 11 is formed on at least one side of the electrode plate body 10. For example, a sealing groove 11 can be formed on one side of the electrode plate body 10, or a sealing groove 11 is formed on both sides of the electrode plate body 10. Specifically, the sealing groove 11 can be reasonably set according to the specific structural form of the electrode plate body 10, and no specific limitation is made here, as long as it can meet the normal use of the electrode plate 100.

[0045] The adhesion layer 20 is disposed in the sealing groove 11 and fixedly connected to the electrode plate 100, which can improve the mechanical strength of the electrode plate 100 in the sealing groove 11 area, thereby improving the safety and reliability of the fuel cell. The adhesion layer 20 and the sealing layer 30 are stacked and fixedly connected, which can make the adhesion layer 20 and the sealing layer 30 quickly cross-link and diffuse during the curing process, thereby making the interface area of ​​the adhesion layer 20 and the sealing layer 30 react quickly to form a covalent bond, thereby effectively improving the bonding strength between the adhesion layer 20 and the sealing layer 30, and the adhesion layer 20 is disposed in the sealing groove 11 and fixedly connected to the electrode plate 100, thereby improving the bonding strength between the electrode plate 100 and the sealing structure 40, thereby improving the sealing performance, safety and reliability of the fuel cell.

[0046] According to some embodiments of the present invention, Figure 1As shown, the sealing groove 11 may have two opposite and spaced apart groove side walls 12 , and the groove bottom wall 13 is connected between the two groove side walls 12 , and the spacing distance between the two groove side walls 12 gradually increases from the groove bottom wall 13 to the open end of the groove bottom wall 13 .

[0047] The sealing groove 11 may have two groove side walls 12 that are opposite and spaced apart, and the groove bottom wall 13 is connected between the two groove side walls 12, and the groove bottom wall 13 and the two groove side walls 12 may be integrally formed. From the groove bottom wall 13 to the open end direction of the groove bottom wall 13, the spacing distance between the two groove side walls 12 gradually increases, which can increase the cross-sectional area of ​​the open end of the sealing groove 11. Since the adhesion layer 20 and the sealing layer 30 are stacked and fixedly connected along the depth direction of the sealing groove 11, the adhesion layer 20 is located between the groove bottom wall 13 of the sealing groove 11 and the sealing layer 30, so that the surface area of ​​the adhesion layer 20 close to the sealing layer 30 can be increased, thereby increasing the contact area between the adhesion layer 20 and the sealing layer 30, thereby improving the bonding strength between the adhesion layer 20 and the sealing layer 30, and thereby improving the bonding strength between the electrode plate 100 and the sealing layer 30.

[0048] According to some embodiments of the present invention, Figure 1 As shown, both groove side walls 12 are configured as inclined walls. From the groove bottom wall 13 to the open end of the groove bottom wall 13 , both groove side walls 12 are inclined toward the outside of the sealing groove 11 .

[0049] Among them, both groove side walls 12 can be constructed as inclined walls, and from the groove bottom wall 13 to the open end of the groove bottom wall 13, the two groove side walls 12 are inclined toward the outside of the sealing groove 11. Such a configuration can make the cross-sectional area of ​​the open end of the sealing groove 11 larger than the cross-sectional area of ​​the groove bottom wall 13, thereby further increasing the cross-sectional area of ​​the open end of the sealing groove 11, and further increasing the surface area of ​​the adhesion layer 20 close to the sealing layer 30, thereby further increasing the contact area between the adhesion layer 20 and the sealing layer 30 in the sealing groove 11, and further improving the bonding strength between the adhesion layer 20 and the sealing layer 30, thereby further improving the bonding strength between the electrode plate 100 and the sealing layer 30.

[0050] According to some embodiments of the present invention, the electrode body 10 may be a graphite electrode.

[0051] Among them, the plate body 10 can be a graphite plate, which has good thermal conductivity and can effectively conduct the heat generated inside the battery stack to prevent thermal runaway of the fuel cell. The graphite plate has good electrical conductivity and can effectively collect and transmit current to ensure the normal operation of the fuel cell. The long-term operation of the car requires high corrosion resistance of the fuel cell. The graphite plate has good corrosion resistance and can meet the needs of long-term operation of the car. And the graphite plate can provide a uniform gas distribution environment, so that the fuel and the oxidant can fully contact and react, thereby improving the efficiency of the fuel cell. Furthermore, the graphite plate can be a flexible graphite plate. The flexible graphite has micropores. The micropores exist between the flexible graphite particles, inside each independent flexible graphite particle, and inside the flexible graphite cell wall. The adhesion layer 20 will diffuse into the micropores of the flexible graphite, thereby increasing the adsorption and diffusion range of the adhesion layer 20 and the plate 100, thereby improving the bonding strength between the adhesion layer 20 and the plate 100, thereby improving the bonding strength between the plate 100 and the sealing layer 30, and thereby improving the sealing performance of the plate 100.

[0052] The fuel cell according to the embodiment of the utility model includes the electrode plate 100 of the above embodiment. By stacking and fixing the adhesion layer 20 and the sealing layer 30, the adhesion layer 20 and the sealing layer 30 can be quickly cross-linked and diffused during the curing process, so that the interface area of ​​the adhesion layer 20 and the sealing layer 30 can quickly react to form a covalent bond, thereby effectively improving the bonding strength between the adhesion layer 20 and the sealing layer 30. The adhesion layer 20 is arranged in the sealing groove 11 and fixedly connected to the electrode plate 100, thereby improving the bonding strength between the electrode plate 100 and the sealing structure 40, thereby improving the sealing performance, safety and reliability of the fuel cell.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A sealing structure (40) for a plate (100), characterized in that: A sealing groove (11) is formed on at least one side of the electrode plate (100), and the sealing structure (40) comprises: An adhesive layer (20) and a sealing layer (30), wherein the adhesive layer (20) is suitable for being arranged in the sealing groove (11) and being fixedly connected to the electrode plate (100), the adhesive layer (20) and the sealing layer (30) are superimposed and fixedly connected, and the sealing layer (30) is located on a side of the adhesive layer (20) that is away from a groove bottom wall (13) of the sealing groove (11).

2. The sealing structure (40) for a plate (100) according to claim 1, characterized in that: The surface energy of the adhesion layer (20) is greater than the surface energy of the sealing layer (30).

3. The sealing structure (40) for a plate (100) according to claim 2, characterized in that: The adhesive layer (20) comprises a polymer, and the sealing layer (30) comprises a sealant.

4. The sealing structure (40) for a plate (100) according to claim 1, characterized in that: The thickness dimension of the adhesion layer (20) is D, which satisfies the relationship: 30 μm≤D≤80 μm.

5. The sealing structure (40) for a plate (100) according to claim 1, characterized in that: The adhesive layer (20) is designed as a thermosetting adhesive layer (20).

6. A polar plate (100), characterized in that: include: A plate body (10), wherein at least one side of the plate body (10) is formed with a sealing groove (11); A sealing structure (40), wherein the sealing structure (40) is a sealing structure (40) for a pole plate (100) according to any one of claims 1 to 5, wherein the adhesion layer (20) is disposed in the sealing groove (11) and is fixedly connected to the pole plate (100), the adhesion layer (20) and the sealing layer (30) are stacked and fixedly connected, and the sealing layer (30) is located on the side of the adhesion layer (20) that is away from the bottom wall (13) of the sealing groove (11).

7. The electrode plate (100) according to claim 6, characterized in that: The sealing groove (11) has two groove side walls (12) that are opposite and spaced apart, the groove bottom wall (13) is connected between the two groove side walls (12), and the spacing distance between the two groove side walls (12) gradually increases from the groove bottom wall (13) to the open end of the groove bottom wall (13).

8. The electrode plate (100) according to claim 7, characterized in that: The two groove side walls (12) are both constructed as inclined walls, and the two groove side walls (12) are both inclined toward the outside of the sealing groove (11).

9. The electrode plate (100) according to claim 6, characterized in that: The electrode plate body (10) is a graphite electrode plate.

10. A fuel cell, characterized in that: It comprises a pole plate (100) according to any one of claims 6-9.

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