Fuel cell and manufacturing method
By designing boss and groove structures in the fuel cell electrode assembly and forming seals through injection molding or chemical etching, the problem of insufficient strength of the sealing structure is solved, the connection strength and stability of the seals are improved, and the airtightness of the fuel cell is ensured.
Patent Information
- Application Number
- CN202511030905.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-25
- Publication Date
- 2025-10-31
AI Technical Summary
In existing fuel cells, the sealing structure of the cathode plate, anode plate and membrane electrode is not strong enough, and the seals undergo permanent compression deformation as the operating time increases, affecting the sealing performance.
The electrode assembly design features alternating anode and cathode plates, with a boss design to increase compressive strength. Multiple grooves are formed on the end face of the boss, and the seal is formed in the grooves through injection molding or chemical etching, increasing the contact area and generating an anchoring effect to improve the connection strength.
This improves the connection strength and stability between the electrode plates and the seals, prevents the seals from detaching, ensures the airtightness of the fuel cell, and prevents cross-leakage of reactant gases and coolant leakage.
Smart Images
Figure CN120878884A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of fuel cell technology, and more particularly to a fuel cell and its manufacturing method. Background Technology
[0002] In fuel cells, the sealing of the cathode plate, anode plate, and membrane electrode assembly (MEA) is a key step in ensuring the airtightness of the fuel cell stack and preventing cross-leakage of reactant gases and coolant leakage.
[0003] like Figure 1 As shown, the existing sealing structure for the cathode plate, anode plate, and membrane electrode has grooves on both sides, one on the cathode plate facing the anode plate and the other on the anode plate facing the cathode plate. Sealing elements are placed in both grooves, and the membrane electrode is held between the two sealing elements. This structure lacks structural strength; the sealing elements undergo permanent compression deformation over time, affecting sealing performance.
[0004] Therefore, there is an urgent need for a fuel cell and its manufacturing method to solve the above-mentioned technical problems. Summary of the Invention
[0005] The purpose of this invention is to provide a fuel cell and a method for manufacturing it, which can improve the reliability of the clamping and sealing of the membrane electrode by the cathode plate and the anode plate.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] Fuel cells, including:
[0008] An electrode assembly includes an anode plate and a cathode plate, wherein the anode plate and the cathode plate are spaced apart along a first direction, the cathode plate is provided with a first protrusion protruding toward the anode plate, and the anode plate is provided with a second protrusion protruding toward the cathode plate, wherein the first end face of the first protrusion and the second end face of the second protrusion are directly opposite each other, and both the first end face and the second end face are provided with a plurality of grooves.
[0009] The sealing assembly includes a cathode seal and an anode seal. The cathode seal is disposed on the first end face and fills all the grooves on the first end face, forming a third end face A on the side opposite to the cathode plate. The anode seal is disposed on the second end face and fills all the grooves on the second end face, forming a third end face B on the side opposite to the anode plate. The third end face A and the third end face B sandwich a membrane electrode in the first direction.
[0010] As a preferred technical solution of the above-mentioned fuel cell, the first protrusion includes a first sidewall A, a first sidewall B and a first top wall. The first sidewall A and the first sidewall B are symmetrically arranged in the second direction and point towards the anode plate side in the first direction. The distance between the first sidewall A and the first sidewall B decreases. The first top wall connects the first sidewall A and the first sidewall B. The first end face is formed on the side of the first top wall facing the anode plate.
[0011] The second protrusion includes a second sidewall A, a second sidewall B, and a second top wall. The second sidewall A and the second sidewall B are symmetrically arranged in the second direction and point towards the cathode plate side in the first direction. The distance between the second sidewall A and the second sidewall B decreases. The second top wall connects the second sidewall A and the second sidewall B. The second end face is formed on the side of the second top wall facing the cathode plate.
[0012] The first direction mentioned above is perpendicular to the second direction mentioned above.
[0013] As a preferred technical solution for the aforementioned fuel cell, the edge contour of the groove on the first end face is rectangular when projected onto a plane parallel to the first direction.
[0014] And / or, the edge profile of the groove on the second end face is rectangular.
[0015] As a preferred technical solution for the aforementioned fuel cell, the edge contour of the groove on the first end face is serrated when projected onto a plane parallel to the first direction.
[0016] And / or, the edge profile of the groove on the second end face is serrated.
[0017] As a preferred technical solution for the aforementioned fuel cell, the edge contour of the groove on the first end face is curved when projected onto a plane parallel to the first direction.
[0018] And / or, the edge profile of the groove on the second end face is curved.
[0019] A method for manufacturing a fuel cell is also provided, applicable to the aforementioned fuel cell, wherein the cathode seal is formed on the first end face by injection molding; and / or, the anode seal is formed on the second end face by injection molding.
[0020] As a preferred technical solution of the above-mentioned fuel cell manufacturing method, the first end face is formed with the groove by chemical reagent etching, and / or the second end face is formed with the groove by chemical reagent etching.
[0021] As a preferred technical solution of the above-mentioned fuel cell manufacturing method, the groove is formed on the first end face by laser processing, and / or the groove is formed on the second end face by laser processing.
[0022] As a preferred technical solution for the above-mentioned fuel cell manufacturing method, the laser power is 50W to 200W, the laser speed is 100mm / s to 300mm / s, the laser focal length is -2mm to 2mm, and the laser duty cycle is 15% to 50%.
[0023] As a preferred technical solution for the above-mentioned fuel cell manufacturing method, after forming the above-mentioned groove, the above-mentioned first end face and the above-mentioned second end face are cleaned, and then the above-mentioned sealing component assembly is assembled.
[0024] Beneficial effects of this invention:
[0025] This invention provides a fuel cell and its manufacturing method. The fuel cell includes an electrode assembly, a membrane electrode assembly, and a sealing assembly. The electrode assembly includes an anode plate and a cathode plate, which are spaced apart along a first direction. The cathode plate has a first protrusion protruding towards the anode plate, and the anode plate has a second protrusion protruding towards the cathode plate. The first end face of the first protrusion and the second end face of the second protrusion face each other, and both the first and second end faces have multiple grooves. The sealing assembly includes a cathode seal and an anode seal. The cathode seal is disposed on the first end face, filling all the grooves on the first end face, and forming a third end face A on the side opposite to the cathode plate. The anode seal is disposed on the second end face, filling all the grooves on the second end face, and forming a third end face B on the side opposite to the anode plate. The membrane electrode is sandwiched between the third end face A and the third end face B in the first direction.
[0026] In the electrode assembly, the anode plate and the cathode plate are spaced apart in a first direction, forming a clamping space between them. The anode plate has a second protrusion protruding into the clamping space, and the cathode plate has a first protrusion protruding into the clamping space. Thus, when the anode plate and the cathode plate clamp the membrane electrode, a mutual squeezing force is generated between the anode plate and the cathode plate. Due to the protruding design of the first and second protrusions, the two are not easily deformed under the squeezing force, and the clamping of the membrane electrode can be maintained.
[0027] The first end face contacts the membrane electrode via a cathode seal, and the second end face contacts the membrane electrode via an anode seal. To ensure a stable connection between the seal assembly and the electrode assembly, multiple grooves are formed on both the first and second end faces in this embodiment. The cathode seal includes a first mating surface and a third end face A arranged opposite to each other in the first direction. The first mating surface has protrusions corresponding to the grooves on the first end face. When the cathode seal is placed on the first end face, the first mating surface faces the first end face directly, and the protrusions on the first mating surface fill the grooves on the first end face one by one. The third end face A is used to contact the membrane electrode. The anode seal includes a second mating surface and a third end face B arranged opposite to each other in the first direction. The second mating surface has protrusions corresponding to the grooves on the second end face. When the anode seal is placed on the second end face, the second mating surface faces the second end face directly, and the protrusions on the second mating surface fill the grooves on the second end face one by one. The third end face B is used to contact the membrane electrode. Thus, the grooves formed on the first and second end faces increase the contact area between the electrode and the seal. After the protrusions on the mating surfaces fill the grooves on the end faces, an anchoring effect is generated between the seal and the electrode, making it difficult for the seal to detach from the electrode and improving the connection strength. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.
[0029] Figure 1 This is a schematic diagram of the structure of an existing fuel cell;
[0030] Figure 2 This is a schematic diagram of the structure of a fuel cell provided in an embodiment of the present invention;
[0031] Figure 3 This is a schematic diagram of the groove obtained by chemical etching according to an embodiment of the present invention;
[0032] Figure 4 This is a schematic diagram of the groove obtained by laser processing according to an embodiment of the present invention. Figure 1 ;
[0033] Figure 5 This is a schematic diagram of the groove obtained by laser processing according to an embodiment of the present invention. Figure 2 ;
[0034] Figure 6 This is a schematic diagram of the groove obtained by laser processing according to an embodiment of the present invention. Figure 3 ;
[0035] Figure 7 This is a schematic diagram of the adhesion between the existing sealing components and the electrode plate;
[0036] Figure 8 This is a schematic diagram of the adhesion force between the sealing component and the electrode plate provided in an embodiment of the present invention.
[0037] In the picture:
[0038] X, first direction; Y, second direction;
[0039] 1. Cathode plate; 11. First boss; 101. First end face; 111. First sidewall A; 112. First sidewall B; 113. First top wall;
[0040] 2. Anode plate; 21. Second boss; 201. Second end face; 211. Second sidewall A; 212. Second sidewall B; 213. Second top wall;
[0041] 3. Cathode seal; 301. Third end face A;
[0042] 4. Anode seal; 401. Third end face B;
[0043] 5. Membrane electrode. Detailed Implementation
[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.
[0045] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0047] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.
[0048] like Figures 2 to 6 As shown, the present invention provides a fuel cell, including an electrode assembly, a membrane electrode assembly, and a sealing assembly. The electrode assembly includes an anode plate 2 and a cathode plate 1, which are spaced apart along a first direction X. The cathode plate 1 has a first protrusion 11 protruding towards the anode plate 2, and the anode plate 2 has a second protrusion 21 protruding towards the cathode plate 1. The first end face 101 of the first protrusion 11 and the second end face 201 of the second protrusion 21 are directly opposite each other. Both the first end face 101 and the second end face 201 have multiple grooves. The sealing assembly includes a cathode sealing element 3 and an anode sealing element 4. The cathode sealing element 3 is disposed on the first end face 101 and fills all the grooves of the first end face 101. It forms a third end face A301 on the side opposite to the cathode plate 1. The anode sealing element 4 is disposed on the second end face 201 and fills all the grooves of the second end face 201. It forms a third end face B401 on the side opposite to the anode plate 2. The membrane electrode 5 is sandwiched between the third end face A301 and the third end face B401 in the first direction X.
[0049] For example, in the electrode assembly, the anode plate 2 and the cathode plate 1 are spaced apart in the first direction X, forming a clamping space between them. The anode plate 2 has a second protrusion 21 protruding into the clamping space, and the cathode plate 1 has a first protrusion 11 protruding into the clamping space. In the first direction X, the distance between the first end face 101 of the first protrusion 11 and the second end face 201 of the second protrusion 21 is less than the average distance between the anode plate 2 and the cathode plate 1. Thus, when the anode plate 2 and the cathode plate 1 clamp the membrane electrode 5, a mutual squeezing force is generated between the anode plate 2 and the cathode plate 1. Due to the protruding design of the first protrusion 11 and the second protrusion 21, they are not easily deformed under the squeezing force, thus maintaining the clamping of the membrane electrode 5.
[0050] Furthermore, the first end face 101 contacts the membrane electrode 5 through the cathode seal 3, and the second end face 201 contacts the membrane electrode 5 through the anode seal 4. To ensure a stable connection between the seal assembly and the electrode assembly, in this embodiment, multiple grooves are formed on both the first end face 101 and the second end face 201. The cathode seal 3 includes a first mating surface and a third end face A301 disposed opposite to each other in the first direction X. The first mating surface has protrusions corresponding to the grooves on the first end face 101. When the cathode seal 3 is disposed on the first end face 101, the first mating surface and the third end face A301 are connected. One end face 101 faces each other, and the protrusions on the first mating surface fill the grooves of the first end face 101 one by one. The third end face A301 is used to contact the membrane electrode 5. The anode seal 4 includes a second mating surface and a third end face B401 arranged opposite to each other in the first direction X. The second mating surface has protrusions that correspond to the grooves of the second end face 201. When the anode seal 4 is arranged on the second end face 201, the second mating surface faces the second end face 201, and the protrusions on the second mating surface fill the grooves of the second end face 201 one by one. The third end face B401 is used to contact the membrane electrode 5. Thus, as Figure 7 and Figure 8 As shown, the grooves formed on the first end face 101 and the second end face 201 can increase the contact area between the electrode plate and the seal. After the protrusion of the mating surface fills the groove of the end face, an anchoring effect is generated between the seal and the electrode plate, making it difficult for the seal to detach from the electrode plate and improving the connection strength.
[0051] For example, the electrode plate is made of metal, such as 316L, titanium alloy, and aluminum alloy.
[0052] Optionally, the first boss 11 includes a first sidewall A111, a first sidewall B112, and a first top wall 113. The first sidewalls A111 and B112 are symmetrically arranged in the second direction Y and point towards the anode plate 2 in the first direction X. The distance between the first sidewalls A111 and B112 decreases. The first top wall 113 connects the first sidewalls A111 and B112. A first end face 101 is formed on the side of the first top wall 113 facing the anode plate 2. The second boss 2 1 includes a second sidewall A211, a second sidewall B212, and a second top wall 213. The second sidewall A211 and the second sidewall B212 are symmetrically arranged in the second direction Y and point towards the cathode plate 1 in the first direction X. The distance between the second sidewall A211 and the second sidewall B212 decreases. The second top wall 213 connects the second sidewall A211 and the second sidewall B212. A second end face 201 is formed on the side of the second top wall 213 facing the cathode plate 1. The first direction X is perpendicular to the second direction Y.
[0053] For example, the cathode plate 1 includes a first sidewall A111, a first sidewall B112, and a first top wall 113, wherein the first sidewall A111 and the first sidewall B112 are symmetrically located on opposite sides of the first top wall 113 in the second direction Y, the first sidewall A111 is connected to the first top wall 113 and forms an obtuse angle with the first top wall 113, and the first sidewall B112 forms an obtuse angle with the first top wall 113. The anode plate 2 includes a second sidewall A211, a second sidewall B212, and a second top wall 213, wherein the second sidewall A211 and the second sidewall B212 are symmetrically located on opposite sides of the second top wall 213 in the second direction Y, the second sidewall A211 is connected to the second top wall 213 and forms an obtuse angle with the second top wall 213, and the second sidewall B212 forms an obtuse angle with the second top wall 213.
[0054] When assembled with the membrane electrode 5, the membrane electrode 5 can be regarded as being indirectly clamped between the first top wall 113 and the second top wall 213. Due to the protruding design of the first boss 11 and the second boss 21, they have relatively strong structural strength and are not easily deformed during the extrusion process, so that they always maintain a tight contact with the membrane electrode 5 and ensure effective sealing.
[0055] For example, the first protrusion 11 is formed by bending the cathode plate 1, and the first protrusion 11 has a recess on the side opposite to the anode plate 2; the second protrusion 21 is formed by bending the anode plate 2, and the second protrusion 21 has a recess on the side opposite to the cathode plate 1.
[0056] Optionally, when projected onto a plane parallel to the first direction X, the edge contour of the groove on the first end face 101 is rectangular, satisfying the formula And / or, the edge profile of the groove on the second end face 201 is rectangular, satisfying the formula Where Z is the depth of the groove, x is the horizontal coordinate of the second direction Y, a is a constant, and any point on the plane perpendicular to the first direction X is selected as the origin.
[0057] Optionally, when projected onto a plane parallel to the first direction X, the edge profile of the groove on the first end face 101 is serrated, satisfying the formula:
[0058]
[0059] And / or, the edge profile of the groove on the second end face 201 is serrated, satisfying the formula:
[0060]
[0061] Where Z is the depth of the groove, x is the abscissa of the second direction Y, y is the abscissa of the third direction, any point on the plane perpendicular to the first direction X is selected as the origin, and i and j are the serial numbers of the second direction Y and the third direction on the first end face 101; the first direction X, the second direction Y and the third direction are perpendicular to each other.
[0062] For example, taking the groove of the first end face 101 as an example, multiple grooves on the first end face 101 are continuously distributed in a plane parallel to the first direction X, and the opening edges of two adjacent grooves intersect to form a sharp tooth-like protrusion.
[0063] Optionally, when projected onto a plane parallel to the first direction X, the edge contour of the groove on the first end face 101 is curved, satisfying the formula And / or, the edge profile of the groove on the second end face 201 is curved, satisfying the formula Where Z is the depth of the groove, x is the horizontal coordinate of the second direction Y, and any point on the plane perpendicular to the first direction X is selected as the origin.
[0064] A method for manufacturing a fuel cell is also provided, applicable to the aforementioned fuel cell, wherein the cathode seal 3 is formed on the first end face 101 by injection molding; and / or, the anode seal 4 is formed on the second end face 201 by injection molding.
[0065] Thus, by using injection molding, the anode seal 4 is combined with the anode plate 2, and the cathode seal 3 is combined with the cathode plate 1. The fluid seal can fully contact the plates, fill the grooves, and form a third end face on the side opposite to the plates for contact with the membrane electrode 5. Compared to common adhesive strip bonding, the injection-molded seal avoids misalignment problems.
[0066] For example, the anode seal 4 and / or the cathode seal 3 are made of silicone rubber, EPDM rubber, fluororubber, etc.
[0067] For example, during injection molding, the molding temperature is controlled between 100°C and 200°C, the molding pressure is controlled between 50 bar and 150 bar, the holding pressure is controlled between 20 bar and 40 bar, and the holding time is controlled between 30 s and 50 s.
[0068] It should be noted that the injection speed of the seal needs to be determined based on the fluidity of the seal, but 70% to 90% of the maximum injection speed should be used during injection.
[0069] Optionally, the first end face 101 is etched with a chemical reagent to form a groove, and / or the second end face 201 is etched with a chemical reagent to form a groove.
[0070] For example, chemical reagents include solutions such as sulfuric acid, nitric acid, hydrochloric acid, and sodium hydroxide.
[0071] For example, the concentration of the chemical reagent is divided into three levels: strong, medium, and weak, based on the depth of the groove in the first direction X and the reaction time.
[0072] like Figure 3 As shown, the grooves formed by chemical corrosion are mostly sharp teeth of varying depths.
[0073] Optionally, the first end face 101 is formed with a groove by laser processing, and / or the second end face 201 is formed with a groove by laser processing.
[0074] like Figures 4 to 6 As shown, this is a groove formed by laser processing.
[0075] Optionally, the laser power is 50W to 200W, the laser speed is 100mm / s to 300mm / s, the laser focal length is -2mm to 2mm, and the laser duty cycle is 15% to 50%.
[0076] For example, using a low duty cycle for surface treatment can avoid deformation of the plate, coarsening of grains, or oxidation caused by local heat accumulation on the surface, which would affect the adhesion of subsequent coatings.
[0077] Optionally, after forming the groove, the first end face 101 and the second end face 201 are cleaned before the sealing assembly is assembled.
[0078] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.
Claims
1. A fuel cell, characterized in that, include: An electrode assembly includes an anode plate (2) and a cathode plate (1). The anode plate (2) and the cathode plate (1) are spaced apart along a first direction (X). The cathode plate (1) has a first protrusion (11) protruding towards the anode plate (2), and the anode plate (2) has a second protrusion (21) protruding towards the cathode plate (1). The first end face (101) of the first protrusion (11) and the second end face (201) of the second protrusion (21) are directly opposite each other. Both the first end face (101) and the second end face (201) are provided with a plurality of grooves. The sealing assembly includes a cathode seal (3) and an anode seal (4). The cathode seal (3) is disposed on the first end face (101) and fills all the grooves of the first end face (101). A third end face A (301) is formed on the side opposite to the cathode plate (1). The anode seal (4) is disposed on the second end face (201) and fills all the grooves of the second end face (201). A third end face B (401) is formed on the side opposite to the anode plate (2). The third end face A (301) and the third end face B (401) sandwich a membrane electrode (5) in the first direction (X).
2. The fuel cell according to claim 1, characterized in that, The first boss (11) includes a first sidewall A (111), a first sidewall B (112) and a first top wall (113). The first sidewall A (111) and the first sidewall B (112) are symmetrically arranged in the second direction (Y) and point towards the anode plate (2) in the first direction (X). The distance between the first sidewall A (111) and the first sidewall B (112) decreases. The first top wall (113) connects the first sidewall A (111) and the first sidewall B (112). The first end face (101) is formed on the side of the first top wall (113) facing the anode plate (2). The second boss (21) includes a second sidewall A (211), a second sidewall B (212), and a second top wall (213). The second sidewall A (211) and the second sidewall B (212) are symmetrically arranged in the second direction (Y) and point towards the cathode plate (1) in the first direction (X). The distance between the second sidewall A (211) and the second sidewall B (212) decreases. The second top wall (213) connects the second sidewall A (211) and the second sidewall B (212). The second end face (201) is formed on the side of the second top wall (213) facing the cathode plate (1). The first direction (X) is perpendicular to the second direction (Y).
3. The fuel cell according to claim 1, characterized in that, Projected onto a plane parallel to the first direction (X), the edge contour of the groove on the first end face (101) is rectangular; And / or, the edge profile of the groove on the second end face (201) is rectangular.
4. The fuel cell according to claim 1, characterized in that, Projected onto a plane parallel to the first direction (X), the edge contour of the groove on the first end face (101) is serrated. And / or, the edge profile of the groove on the second end face (201) is serrated.
5. The fuel cell according to claim 1, characterized in that, Projected onto a plane parallel to the first direction (X), the edge contour of the groove on the first end face (101) is curved; And / or, the edge profile of the groove on the second end face (201) is curved.
6. A method for manufacturing a fuel cell, applicable to the fuel cell according to any one of claims 1-5, characterized in that, The cathode seal (3) is formed on the first end face (101) by injection molding; and / or, the anode seal (4) is formed on the second end face (201) by injection molding.
7. The method for manufacturing a fuel cell according to claim 6, characterized in that, The first end face (101) is etched with a chemical reagent to form the groove, and / or the second end face (201) is etched with the chemical reagent to form the groove.
8. The method for manufacturing a fuel cell according to claim 6, characterized in that, The groove is formed on the first end face (101) by laser processing, and / or the groove is formed on the second end face (201) by laser processing.
9. The method for manufacturing a fuel cell according to claim 8, characterized in that, The laser power is 50W to 200W, the laser speed is 100mm / s to 300mm / s, the laser focal length is -2mm to 2mm, and the laser duty cycle is 15% to 50%.
10. The method for manufacturing a fuel cell according to claim 7 or 8, characterized in that, After the groove is formed, the first end face (101) and the second end face (201) are cleaned before the sealing assembly is assembled.