TW202322444A - Fuel cell and fuel cell manufacturing method - Google Patents

Abstract

The invention discloses a fuel cell and a manufacturing method of the fuel cell. The fuel cell includes two fixing parts, a plurality of electrode plates, a plurality of inner titanium mesh structures, a plurality of outer titanium mesh structures, a plurality of membrane electrode groups, a plurality of catalyst layers, and a plurality of sealing rings. An inner titanium mesh structure is fixed on one side of each electrode plate by diffusion welding technology. Each inner titanium mesh structure and the electrode plate together form a plurality of flow channels. An inner titanium mesh structure is fixed on the other side of part of the electrode plate by diffusion welding technology. An outer titanium mesh structure is fixed on the other side of each inner titanium mesh structure. A catalyst layer is provided on one side of each outer titanium mesh structure. Each membrane electrode group is located between two outer titanium mesh structures, and each outer titanium mesh structure serves as a gas diffusion layer.

Description

Fuel cell and fuel cell manufacturing method

The invention relates to a fuel cell and a manufacturing method thereof, in particular to a fuel cell without carbon cloth and a manufacturing method thereof.

The existing common fuel cells use carbon cloth as the gas diffusion layer, and the carbon cloth, the electrode plate and the membrane electrode group are only in contact with each other. Therefore, after the fuel cell is used for a long time, the carbon cloth is prone to corrosion. The problem, in this way, will lead to an increase in the contact resistance between the carbon cloth and the electrode plate, thereby reducing the power generation capacity of the fuel cell.

The invention discloses a fuel cell and a manufacturing method of the fuel cell, which are mainly used to improve the existing fuel cell with carbon cloth. After long-term use, the carbon cloth is prone to corrosion, which leads to the problem that the power generation capacity of the fuel cell is reduced. .

One embodiment of the present invention discloses a fuel cell, which includes: multiple electrode plates, multiple inner titanium mesh structures, multiple outer titanium mesh structures, multiple catalyst layers, multiple membrane electrode groups, and multiple sealing rings and two mounts. A plurality of electrode plates located at two ends of the fuel cell are respectively defined as an outer electrode plate, a wide side of each outer electrode plate is planar, and the rest of the electrode plates are respectively defined as an inner electrode plate, each inner electrode plate The two wide sides opposite to each other are planar respectively; each electrode plate has an inlet perforation and an outlet perforation, each inlet perforation penetrates the electrode plate, and each outlet perforation penetrates the electrode plate; one wide side of each outer electrode plate is made by diffusion welding Technology and an inner titanium mesh structure are fixed to each other, and the two wide sides of each inner electrode plate are respectively fixed to an inner titanium mesh structure by diffusion welding technology; each inner titanium mesh structure contains multiple titanium wires, and each titanium wire A plurality of sections at different positions are overlapped with different titanium wires, and each inner titanium mesh structure contains a plurality of mesh holes; a plurality of sections at different positions of each titanium wire are welded with the electrode plate, each The section where one titanium wire is not welded to the electrode plate is stacked on one side of another titanium wire, and the sections where each titanium wire is not welded to the electrode plate form multiple flow channels together with the electrode plate. The multiple flow channels, inlet perforations and outlet perforations of each electrode plate are connected to each other; each outer titanium mesh structure is fixed on one of the inner titanium mesh structures by diffusion welding technology on the side opposite to the electrode plate, and each outer titanium mesh structure Contains a plurality of auxiliary titanium wires, each auxiliary titanium wire has a plurality of sections at different positions overlapped with different auxiliary titanium wires, each outer titanium mesh structure contains a plurality of mesh holes, and each inner titanium mesh structure The maximum aperture of the included mesh is greater than the maximum aperture of the mesh contained in each outer titanium mesh structure; the sections of multiple different positions of each auxiliary titanium wire are the same as those of the multiple titanium wires included in the inner titanium mesh structure. One section is welded; the position where each electrode plate is connected to the titanium wire can establish a conductive path through at least one titanium wire and multiple auxiliary titanium wires; each catalyst layer is arranged on at least a part of one of the outer titanium mesh structures , at least a part of one of the inner titanium mesh structures and one of the electrode plates is provided with one side of the inner titanium mesh structure; a plurality of membrane electrode groups are arranged between two outer titanium mesh structures; between each electrode plate and the membrane electrode group A sealing ring is provided, and the periphery of each inner titanium mesh structure and the periphery of each outer titanium mesh structure are surrounded by the sealing ring; the inlet and outlet perforations of each electrode plate are located in the area enclosed by the sealing ring; each fixing member has One perforation, the perforation runs through the fixing part; the two fixing parts hold multiple electrode plates, multiple inner titanium mesh structures, multiple outer titanium mesh structures, multiple catalyst layers, multiple membrane electrode groups and multiple sealing rings, and A plurality of inlet perforations jointly form an entry channel, wherein the perforation of one fixing part is connected with the entry channel, and a plurality of outlet perforations jointly form an exit channel, and the perforation of the other fixing part is connected with the exit channel, and each electrode plate is connected with the inner titanium mesh The structures collectively form a plurality of flow channels, entry channels, and exit channels that communicate with each other.

One embodiment of the present invention discloses a fuel cell manufacturing method, which is used to manufacture a fuel cell, the fuel cell includes a plurality of electrode plates, a plurality of inner titanium mesh structures, a plurality of outer titanium mesh structures, and a plurality of catalysts layer, a plurality of membrane electrode groups and two fixing parts, the two electrode plates located at both ends of the fuel cell are respectively defined as an outer electrode plate, and the rest of the electrode plates are respectively defined as an inner electrode plate; each inner titanium mesh structure includes multiple Each titanium wire has a plurality of segments at different positions overlapped with different titanium wires, each inner titanium mesh structure contains multiple mesh holes; each outer titanium mesh structure contains multiple auxiliary titanium wires , the sections of multiple different positions of each auxiliary titanium wire overlap with different auxiliary titanium wires, and each outer titanium mesh structure contains a plurality of mesh holes, and the maximum mesh size of each inner titanium mesh structure contains The pore size is greater than the maximum pore size of the meshes contained in each outer titanium mesh structure; the manufacturing method of the fuel cell includes the following steps: an outer electrode plate manufacturing step: using diffusion welding technology, one side of each outer electrode plate is fixed with an inner titanium The mesh structure, and the inner titanium mesh structure is fixed on the side opposite to the outer electrode plate with an outer titanium mesh structure, and the position where each outer electrode plate is connected to the titanium wire can pass through at least one titanium wire and multiple auxiliary titanium wires A conductive path is jointly established, and the section where each titanium wire is not welded to the outer electrode plate is correspondingly stacked on one side of another titanium wire, and the section where each titanium wire is not welded to the outer electrode plate and The outer electrode plates jointly form a plurality of flow channels; an inner electrode plate manufacturing step: use diffusion welding technology to fix an inner titanium mesh structure on one side of each inner electrode plate, and make the inner titanium mesh structure opposite to that of the inner electrode plate An outer titanium mesh structure is fixed on one side, and the position where each inner electrode plate is connected to the titanium wire can establish a conductive path through at least one titanium wire and multiple auxiliary titanium wires, and each titanium wire is not connected to the inner electrode plate. The sections that are welded to each other are correspondingly stacked on one side of another titanium wire, and the sections where each titanium wire is not welded to the inner electrode plate form multiple flow channels with the inner electrode plate; a catalyst layer forms Steps: Coating a catalyst layer on one side of each outer titanium mesh structure, each inner titanium mesh structure and the electrode plate fixed thereto; an assembly step: fixing two fixing parts to each other so that multiple electrode plates, A plurality of inner titanium mesh structures and a plurality of membrane electrode groups are held by two fixing parts; wherein, each membrane electrode group is located between the two inner titanium mesh structures.

In summary, the fuel cell and the fuel cell manufacturing method of the present invention fix the inner titanium mesh structure and the outer titanium mesh structure to the electrode plates by diffusion welding technology, and form the catalyst layer on the outer titanium mesh structure. The design of the surface of the titanium mesh structure, the surface of the inner titanium mesh structure, and the surface of the electrode plate can allow the fuel cell to be jointly established by each electrode plate, multiple titanium wires and multiple auxiliary titanium wires after long-term use. The plurality of conductive paths can still maintain the effect of electrical conduction, thereby maintaining the operating efficiency of the fuel cell.

In order to further understand the characteristics and technical content of the present invention, please refer to the following detailed description and drawings related to the present invention, but these descriptions and drawings are only used to illustrate the present invention, rather than to make any statement on the scope of protection of the present invention. limit.

In the following description, if it is pointed out that please refer to the specific drawing or as shown in the specific drawing, it is only used to emphasize the subsequent description, and most of the relevant content mentioned appears in the specific drawing, It is not intended, however, to limit the ensuing description to only those particular drawings referred to. The dimensions and proportional relationships of the various structures presented in the drawings of this embodiment are only drawn for the convenience of description in the description, and the dimensions and proportional relationships shown in the figures do not represent actual Applied dimensions and proportional relationships.

Please refer to FIG. 1 and FIG. 2 together, which respectively show a perspective view and an exploded view of the fuel cell of the present invention. The fuel cell 100 of the present invention comprises three electrode plates, four inner titanium mesh structures 3, four outer titanium mesh structures 4, four catalyst layers 5, two membrane electrode assemblies (Membrane Electrode Assembly, MEA) 6, four A sealing ring 7 and two fixing parts 8A, 8B. The two electrode plates located at both ends of the fuel cell 100 are respectively defined as an outer electrode plate 1 , and the remaining electrode plates are respectively defined as an inner electrode plate 2 . In the drawings of this embodiment, for convenience of description, only a single inner electrode plate 2 is shown, but in practical applications, the number of inner electrode plates 2 is not limited to a single piece.

Please refer to FIG. 3 , which is a partially enlarged schematic view of the inner titanium mesh structure 3 and the outer titanium mesh structure 4 . Each inner titanium mesh structure 3 includes a plurality of titanium wires 31, and a plurality of segments at different positions of each titanium wire 31 are arranged to overlap with different titanium wires 31, and each inner titanium mesh structure 3 includes a plurality of mesh holes 32. To put it simply, each inner titanium mesh structure 3 is a three-dimensional braided mesh structure formed by interweaving a plurality of titanium wires 31 .

Each outer titanium mesh structure 4 includes a plurality of auxiliary titanium wires 41, and sections of multiple different positions of each auxiliary titanium wire 41 are arranged to overlap with different auxiliary titanium wires 41, and each outer titanium mesh structure 4 includes multiple Each mesh 42, simply speaking, each outer titanium mesh structure 4 is a three-dimensional braided mesh structure formed by interweaving a plurality of auxiliary titanium wires 41. The maximum aperture diameter of the mesh 32 included in each inner titanium mesh structure 3 is greater than the maximum aperture diameter of the mesh 42 included in each outer titanium mesh structure 4 . The weaving method of the inner titanium mesh structure 3 and the outer titanium mesh structure 4 are not limited to those shown in FIG. 3 , and may be changed according to requirements in practical applications.

In one embodiment, the maximum aperture of each mesh 32 of each inner titanium mesh structure 3 may be 2 to 20 times the maximum aperture of each mesh 42 of each outer titanium mesh structure 4 . In one of the embodiments, the apertures of each mesh 32 of each inner titanium mesh structure 3 can be between 0.1 and 1.0 millimeters (mm), and the apertures of each mesh 42 of each outer titanium mesh structure 4 can be between 0.1 and 1.0 millimeters (mm). In 0.05 ~ 0.5 millimeters (mm). In one of the embodiments, the overall size of each inner titanium mesh structure 3 and the overall size of each outer titanium mesh structure 4 are the same (i.e. the overall width and length of the inner titanium mesh structure 3, and the overall width and length of the outer titanium mesh structure 4, The lengths are the same), and the mesh number of each inner titanium mesh structure 3 is between 50-500 mesh, and the mesh number of each outer titanium mesh structure is between 80-5000 mesh. In one of the embodiments, the overall size of each inner titanium mesh structure 3 and the overall size of each outer titanium mesh structure 4 are the same (i.e. the overall width and length of the inner titanium mesh structure 3, and the overall width and length of the outer titanium mesh structure 4, The same length), and the number of meshes included in each inner titanium mesh structure is 1.6-100 times the number of meshes included in each outer titanium mesh structure.

Please refer to Figure 2, Figure 4 to Figure 6 together, Figure 4 shows a schematic diagram of the external electrode, sealing ring, outer titanium mesh structure and auxiliary titanium mesh, Figure 5 is a partially enlarged schematic diagram of Figure 4, Figure 6 is a schematic diagram of the present invention Schematic cross-section of a fuel cell. A wide side 11 of each outer electrode plate 1 is planar, and the wide side 11 of the outer electrode plate 1 is fused with an inner titanium mesh structure 3 and an outer titanium mesh structure 4 by using diffusion bonding technology, The multiple sections of each titanium wire 31 in different positions are welded to the outer electrode plate 1, and the sections of each titanium wire 31 that are not welded to the outer electrode plate 1 are correspondingly stacked on another titanium wire 31. One side of each titanium wire 31 that is not welded to the outer electrode plate 1 and the outer electrode plate 1 jointly form a plurality of flow channels C (as shown in FIG. 6 ), and the plurality of auxiliary titanium wires 41 The sections at different positions are welded with the titanium wire 31, and the section where each auxiliary titanium wire 41 is not welded with the titanium wire 31 is stacked on one side of another auxiliary titanium wire 41, and each external electrode plate 1 The position connected to each titanium wire 31 can establish a conductive path through at least one titanium wire 31 and multiple auxiliary titanium wires 41.

As shown in Fig. 2 and Fig. 6, the two opposite broad sides 21 of each inner electrode plate 2 are all planar, and each wide side 21 of each inner electrode plate 2 is to utilize diffusion welding technology, and an inner titanium mesh The structure 3 and an outer titanium mesh structure 4 are welded to each other, and the sections at different positions of each titanium wire 31 are welded with the inner electrode plate 2, and the areas where each titanium wire 31 is not welded with the inner electrode plate 2 section, which is correspondingly stacked on one side of another titanium wire 31, and the section where each titanium wire 31 is not welded to the inner electrode plate 2 forms a plurality of flow channels C together with the inner electrode plate 2 (as shown in FIG. 6 Shown), the sections of each auxiliary titanium wire 41 in different positions are welded with the titanium wire 31, and the sections of each auxiliary titanium wire 41 that are not welded with the titanium wire 31 are correspondingly stacked on another auxiliary titanium wire 41. One side of the titanium wire 41 , and the position where each internal electrode plate 2 is connected to each titanium wire 31 , can establish a conductive path through at least one titanium wire 31 and multiple auxiliary titanium wires 41 .

Specifically, a part of the inner titanium mesh structure 3 is used to form a plurality of flow channels C together with the wide sides 21 of each inner electrode plate 2, and another part of the inner titanium mesh structure 3 is used to connect with each outer electrode plate 1. The wide sides 21 together form a plurality of flow channels C, and the wide side 11 of each outer electrode plate 1 and the wide side 21 of each inner electrode plate 2 do not need to perform additional flow channel forming procedures. Each outer titanium mesh structure 4 is used as a gas diffusion layer, and each outer titanium mesh structure 4 is used to replace the carbon cloth in the conventional fuel cell 100 .

In one of the preferred embodiments, the material of each outer electrode plate 1 and each inner electrode plate 2 can be titanium, and each outer electrode plate 1 and each inner electrode plate 2 can be titanium alloy plate or pure titanium, for example In this way, the connection strength between each titanium wire 31 and the electrode plate (outer electrode plate 1, inner electrode plate 2) will be strengthened, and each auxiliary titanium wire 41 and each titanium wire 31 will be strengthened. The connection strength of the welded position is not easy to occur in the position where each titanium wire 31 is welded to the electrode plate (outer electrode plate 1, inner electrode plate 2) and the position where each titanium wire 31 is welded to the auxiliary titanium wire 41. problems such as breakage. In different embodiments, the material of each outer electrode plate 1 and each inner electrode plate 2 may also be stainless steel.

As shown in Figure 6, a part of each inner titanium mesh structure 3 is provided with a catalyst layer 5, a part of each outer titanium mesh structure 4 is provided with a catalyst layer 5, and each outer electrode plate 1 is provided with an inner titanium mesh structure 3. A part of the side surface, and a part of the side surface of each internal electrode plate 2 provided with the inner titanium mesh structure 3 are also provided with the catalyst layer 5 . In different embodiments, the catalyst layer 5 may also be formed only on the side of the outer titanium mesh structure 4 opposite to the inner titanium mesh structure 3 . In practical applications, the catalyst layer 5 may be made of materials such as platinum, gold, or iridium oxide, which is not limited here.

As shown in FIG. 2 and FIG. 6 , each membrane electrode group 6 is disposed between two outer titanium mesh structures 4 , and the opposite sides of each membrane electrode group 6 are in contact with the adjacent outer titanium mesh structure 4 . A sealing ring 7 is arranged between each membrane electrode group 6 and the adjacent outer electrode plate 1 or inner electrode plate 2, and the periphery of each inner titanium mesh structure 3 is surrounded by the sealing ring 7, and each outer titanium mesh structure 4 The periphery of the cylinder is surrounded by a sealing ring 7, and the sealing ring 7 is mainly used to limit the flow range of the gas and the reacted liquid. The number and shape of the sealing rings 7 arranged between each membrane electrode group 6 and the adjacent outer electrode plate 1 or inner electrode plate 2 are not limited to those shown in the figure, and can be changed according to requirements.

The two fixing parts 8A, 8B are used to hold a plurality of electrode plates (outer electrode plate 1 and inner electrode plate 2), a plurality of inner titanium mesh structures 3, a plurality of outer titanium mesh structures 4, a plurality of catalyst layers 5, a plurality of A membrane electrode group 6 and a plurality of sealing rings 7. In practical applications, the two fixing parts 8A, 8B may be fixed to each other by a plurality of screws, but not limited thereto.

As shown in FIG. 2 , FIG. 4 , FIG. 7 and FIG. 8 , each outer electrode plate 1 also includes an inlet through hole 12 and an outlet through hole 13 , and the inlet through hole 12 and the outlet through hole 13 are respectively set through the outer electrode plate 1 . Each inner electrode plate 2 also includes an inlet through hole 22 and an outlet through hole 23 , and the inlet through hole 22 and the outlet through hole 23 are respectively disposed through the inner electrode plate 2 . Each inlet perforation 12, 22 and each outlet perforation 13, 23 are located in the area enclosed by the sealing ring 7, that is to say, a part of each inner titanium mesh structure 3 and each outer titanium mesh structure 4 is in contact with the adjacent inlet perforation 12 , 22 or outlet perforations 13, 23 are connected to each other, and there is no sealing ring 7.

As shown in FIG. 1 , FIG. 2 and FIG. 9 , the two fixing parts 8A, 8B respectively have a through hole 8A1 , 8B1 , and the two through holes 8A1 , 8B1 pass through the two fixing parts 8A, 8B respectively. After the two fixing parts 8A, 8B hold a plurality of electrode plates (outer electrode plate 1 and inner electrode plate 2), a plurality of inlet perforations 12, 22 will jointly form an inlet channel P1, and a plurality of outlet perforations 13, 23 will jointly form One leaves the channel P2, and the entering channel P1 and the leaving channel P2 communicate with each other with a plurality of flow channels formed by each electrode plate (outer electrode plate 1 and inner electrode plate 2) and the inner titanium mesh structure 3, and two perforations 8A1 , 8B1 are respectively connected with the entry channel P1 and the exit channel P2.

As shown in Fig. 2, Fig. 7 to Fig. 10, in a preferred embodiment, the external shape of each inlet perforation 12, 22 can be nearly trapezoidal, and each inlet perforation 12, 22 has a long side L1, a The short side L2 and two oblique sides L3, the two ends of the long side L1 are connected with the two oblique sides L3, the two ends of the short side L2 are connected with the two oblique sides L3, and each entrance is perforated 12 The long side L1 of 22 is arranged adjacent to a short side L2 of the inner titanium mesh structure 3; each outlet perforation 13, 23 has a long side L4, a short side L5 and two oblique sides L6, and the outlet perforation 13 The two ends of the long side L4 of , 23 are connected with the two oblique sides L6 of the outlet perforation 13,23, the two ends of the short side L5 of the outlet perforation 13,23 are connected with the two oblique sides of the outlet perforation 13,23 The sides L6 are connected, and the long side L4 of each outlet perforation 13 , 23 is disposed adjacent to a short side L5 of the inner titanium mesh structure 3 and the outer titanium mesh structure 4 .

Each fixing member 8A, 8B may have a guide structure 81, the guide structure 81 is formed with the perforations 8A1, 8B1, and there is a guide channel in the guide structure 81, and the guide channel is connected with the perforations 8A1, 8B1. 8B1 is connected. The two guide channels are respectively defined as an entry guide channel 81A and an exit guide channel 81B. One end of the entry guide channel 81A communicates with the entry channel P1. One end gradually expands toward the direction of the entry channel P1; the end away from the guide channel 81B communicates with the exit channel P2, and the width of the exit guide channel 81B gradually expands from the end close to the perforations 8A1, 8B1 to the direction of the exit channel P2.

As mentioned above, by making the appearance of each inlet through hole 12, 22 and the appearance of each outlet through hole 13, 23 comply with the above description, and make the width of the entry guide channel 81A and the width of the exit guide channel 81B comply with the above description Designs such as changes, combined with the use of diffusion welding technology to fix the inner titanium mesh structure 3 on the outer electrode plate 1, and form multiple flow channels C on the outer electrode plate 1, so that the gas can flow to the electrode plate better In this way, the fuel cell 100 will have better power generation efficiency.

According to the above, the fuel cell 100 of the present invention utilizes diffusion welding technology to fix the inner titanium mesh structure 3 on one side of the electrode plates (outer electrode plate 1 and inner electrode plate 2), so that the electrode plate (outer electrode plate 1 and inner electrode plate 2) 1 and one side of the inner electrode plate 2) form a plurality of flow channels C, so that the electrode plate does not need to carry out additional flow channel forming procedures. Therefore, the manufacturing process of the fuel cell 100 can be simplified, thereby reducing the cost of the fuel cell. production cost.

In addition, the fuel cell 100 of the present invention utilizes the outer titanium mesh structure 4 to replace the carbon cloth (gas diffusion layer) in the known fuel cell, and utilizes diffusion welding technology to make the inner titanium mesh structure 3 fixed on the electrode plate (outer electrode plate 1 and One side of the inner electrode plate 2), and the design that the outer titanium mesh structure 4 is fixed on one side of the inner titanium mesh structure 3 will make the partial sections of the plurality of titanium wires 31 included in the inner titanium mesh structure 3, and The outer electrode plates 1 or the inner electrode plates 2 are welded to each other, and the partial sections of the multiple auxiliary titanium wires 41 and the partial sections of the multiple titanium wires 31 are welded to each other. Therefore, the fuel cell of the present invention 100 After long-term use, the contact impedance between the inner titanium mesh structure 3, the outer titanium mesh structure 4 and each electrode plate can still be maintained in a relatively good state.

On the other hand, in conventional fuel cells, since the carbon cloth and the electrode plate are only in physical contact (the two are only against each other), after a long period of use, the fuel cell is prone to corrosion in some areas of the carbon cloth. As a result, this region cannot conduct electricity, which leads to an increase in the contact resistance between the carbon cloth and the electrode plate, thereby affecting the overall operating efficiency of the fuel cell.

In other words, after the fuel cell 100 of the present invention has been used for a long time, it is jointly established by each electrode plate (outer electrode plate 1, inner electrode plate 2) and the inner titanium mesh structure 3 and outer titanium mesh structure 4 fixed thereto. Most of the multiple conductive paths will be in a state that can still be normally conducted. On the other hand, in conventional fuel cells, after a long period of use, the eroded area of the carbon cloth will lead to the failure of part of the conductive path.

In addition, it is worth mentioning that most of the conventional fuel cell carbon cloths are coated with catalysts on one side, which makes the manufacturing cost of the carbon cloths as a whole relatively expensive. In contrast, the manufacturing cost of the outer titanium mesh structure 4 and catalyst layer 5 included in the fuel cell 100 of the present invention is relatively cheap, and the fuel cell 100 of the present invention also has a relatively cheap manufacturing cost compared to conventional fuel cells. Advantage.

Please refer to FIG. 11 . FIG. 11 is a schematic flow diagram of the manufacturing method of the fuel cell of the present invention. The manufacturing method of the fuel cell of the present invention is used to manufacture a fuel cell, the fuel cell comprises a plurality of electrode plates, a plurality of inner titanium mesh structures, a plurality of outer titanium mesh structures, a plurality of catalyst layers, a plurality of sealing rings, a plurality of The two electrode plates located at the two ends of the fuel cell are respectively defined as an outer electrode plate, and the remaining electrode plates are respectively defined as an inner electrode plate. For the detailed description of the electrode plate, inner titanium mesh structure, outer titanium mesh structure, catalyst layer, sealing ring, membrane electrode group and fixing parts described in this embodiment, please refer to the foregoing embodiments, and will not be repeated here.

A fuel cell manufacturing method includes the following steps:

An outer electrode plate manufacturing step S1: using diffusion welding technology, one side of each outer electrode plate is fixed with an inner titanium mesh structure, and the side of the inner titanium mesh structure opposite to the outer electrode plate is fixed with an outer titanium mesh structure , and the position where each external electrode plate is connected to the titanium wire can establish a conductive path through at least one titanium wire and multiple auxiliary titanium wires, and the section where each titanium wire is not welded to the external electrode plate is the corresponding Stacked on one side of another titanium wire, and the section of each titanium wire that is not welded to the outer electrode plate forms multiple flow channels with the outer electrode plate;

Manufacturing step S2 of an inner electrode plate: Using diffusion welding technology, an inner titanium mesh structure is fixed on one side of each inner electrode plate, and an outer titanium mesh structure is fixed on the side of the inner titanium mesh structure opposite to the inner electrode plate , and the position where each internal electrode plate is connected to the titanium wire can establish a conductive path through at least one titanium wire and multiple auxiliary titanium wires, and the section where each titanium wire is not welded to the internal electrode plate is the corresponding Stacked on one side of another titanium wire, and the section of each titanium wire that is not welded to the inner electrode plate forms multiple flow channels with the inner electrode plate;

A catalyst layer forming step S3: coating a catalyst layer on one side of each outer titanium mesh structure, each inner titanium mesh structure and the electrode plate fixed thereto;

An assembly step S4: Fix the two fixing parts to each other, so that multiple electrode plates, multiple inner titanium mesh structures, and multiple membrane electrode groups are held by the two fixing parts; wherein, each membrane electrode group is located between two inner titanium meshes. between network structures.

In practical application, in the manufacturing step S1 of the outer electrode plate, the outer electrode plate can be set on the platform of the diffusion welding equipment first, then the inner titanium mesh structure is set on the outer electrode plate, and the outer titanium mesh structure is set On the side of the inner titanium mesh structure opposite to the outer electrode plate, finally, the diffusion welding technology is used to weld the sections of different positions of the titanium wires of the inner titanium mesh structure to the outer electrode plate, and make the outer titanium mesh Sections at different positions of each auxiliary titanium wire of the structure are welded to each other with each titanium wire.

In practical application, in the manufacturing step S2 of the inner electrode plate, for example, the diffusion welding technology may be used first to weld and fix an inner titanium mesh structure and an outer titanium mesh structure on one side of the inner electrode plate, and then use the diffusion welding technology , welding and fixing another inner titanium mesh structure and another outer titanium mesh structure to the other side of the inner electrode plate.

In practical applications, in the catalyst layer forming step S3, the catalyst layer can be coated only on one side of each outer titanium mesh structure, or it can be directly fixed with the outer titanium mesh structure and the inner titanium mesh structure. The electrode plate is arranged in the electroplating tank for electroplating.

In practical applications, in the assembling step S4, for example, a plurality of screws and a plurality of nuts may be used to lock the two fixing parts to each other, but the fixing method of the two fixing parts is not limited thereto. In addition, in the assembling step S4, a step of arranging a sealing ring between the membrane electrode group and the adjacent electrode plates is also included.

According to the above, the manufacturing method of the fuel cell of the present invention has the advantages of simple manufacturing process and relatively cheap manufacturing cost compared with the traditional manufacturing method of the fuel cell containing carbon cloth.

In summary, the fuel cell of the present invention fixes the inner titanium mesh structure on one side of the electrode plate by diffusion welding technology to form a plurality of flow channels on one side of the electrode plate, and the outer titanium mesh structure As a gas diffusion layer, the outer titanium mesh structure, inner titanium mesh structure and electrode plates are welded and fixed to each other by diffusion welding technology, which can make the outer titanium mesh structure, inner titanium mesh structure and electrodes The contact resistance between the plates will not be greatly improved, thereby enabling the fuel cell to maintain a relatively good operating efficiency, and the overall service life of the fuel cell of the present invention will be compared with the conventional use of carbon cloth as the gas diffusion layer service life of the fuel cell. In the fuel cell manufacturing method of the present invention, the inner titanium mesh structure is welded and fixed on one side of the electrode plate by using diffusion welding technology, and the design of forming a plurality of flow channels on one side of the electrode plate is formed by using diffusion welding technology. The outer titanium mesh structure used to replace the known carbon cloth, fixed on the electrode plate, and, by means of electroplating, coated with a catalyst layer on the outer titanium mesh structure, can effectively reduce the cost of the fuel cell. manufacturing cost.

The above descriptions are only preferred feasible embodiments of the present invention, and do not limit the patent scope of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the scope of protection of the present invention. .

100: Fuel cells 1: Outer electrode plate 11: wide side 12: Entrance perforation 13: Export perforation 2: Inner electrode plate 21: wide side 22: Entrance perforation 23: Exit perforation 3: Inner titanium mesh structure 31: Titanium wire 32: mesh 4: Outer titanium mesh structure 41: Auxiliary titanium wire 42: mesh 5: Catalyst layer 6: Membrane electrode group 7: sealing ring 8A, 8B: Fixing parts 8A1, 8B1: perforation 81: Guidance structure 81A: Enter the guide channel 81B: Leaving the guiding channel L1, L4: Long sides L2, L5: short sides L3, L6: inclined side P1: access channel P2: leave the channel C: Runner S1, S2, S3, S4: process steps

FIG. 1 is a schematic perspective view of the fuel cell of the present invention.

Fig. 2 is an exploded schematic view of the fuel cell of the present invention.

Fig. 3 is a partially enlarged schematic diagram of the inner titanium mesh structure and the outer titanium mesh structure of the fuel cell of the present invention.

Fig. 4 is a schematic diagram of the outer electrode plate, the outer titanium mesh structure, the inner titanium mesh structure and the sealing ring of the fuel cell of the present invention.

FIG. 5 is a partially enlarged schematic diagram of FIG. 4 .

FIG. 6 is a schematic cross-sectional view along section line VI-VI of FIG. 1 .

Fig. 7 is a front view of the inner electrode plate, the outer titanium mesh structure and the inner titanium mesh structure of the fuel cell of the present invention.

Fig. 8 is a schematic partial cross-sectional view of the fuel cell of the present invention.

Fig. 9 is a perspective view of a partial section of the fuel cell of the present invention.

FIG. 10 is a schematic cross-sectional view along the section line X-X in FIG. 1 .

Fig. 11 is a schematic flow chart of the manufacturing method of the fuel cell of the present invention.

100: Fuel cells

1: Outer electrode plate

11: wide side

12: Entrance perforation

13: Export perforation

2: Inner electrode plate

21: wide side

22: Entrance perforation

23: Exit perforation

3: Inner titanium mesh structure

4: Outer titanium mesh structure

6: Membrane electrode group

7: sealing ring

8A, 8B: Fixing parts

8A1, 8B1: perforation

81: Guidance structure

81A: Enter the guide channel

Claims (9)

A fuel cell comprising: A plurality of electrode plates, the two electrode plates located at both ends of the fuel cell are respectively defined as an outer electrode plate, a wide side of each of the outer electrode plates is planar, and the remaining electrode plates are respectively defined as An internal electrode plate, the two opposite wide sides of each of the internal electrode plates are respectively planar; each of the electrode plates has an inlet perforation and an outlet perforation, each of the inlet perforations runs through the electrode plate, each of the The outlet is perforated through the electrode plate; A plurality of internal titanium mesh structures, one wide side of each of the outer electrode plates is fixed to one of the inner titanium mesh structures by diffusion welding technology, and the two wide sides of each of the inner electrode plates are fixed by diffusion welding The technology is respectively fixed to one inner titanium mesh structure; each said inner titanium mesh structure includes a plurality of titanium wires, and a plurality of segments at different positions of each said titanium wire overlap with different said titanium wires respectively Each of the inner titanium mesh structures contains a plurality of mesh holes; sections of each of the titanium wires at different positions are welded to the electrode plate, and each of the titanium wires is not connected to the The section where the electrode plate is welded is correspondingly stacked on one side of another titanium wire, and each section of the titanium wire that is not welded to the electrode plate forms a plurality of joints with the electrode plate. flow channels, the plurality of flow channels, the inlet perforations and the outlet perforations of each of the electrode plates communicate with each other; A plurality of outer titanium mesh structures, each of the outer titanium mesh structures is fixed to one of the inner titanium mesh structures on the side opposite to the side fixed to the electrode plate by diffusion welding technology, and each of the outer titanium mesh structures includes multiple Auxiliary titanium wires, a plurality of sections in different positions of each of the auxiliary titanium wires are arranged to overlap with different auxiliary titanium wires, each of the outer titanium mesh structures includes a plurality of mesh holes, and each of the auxiliary titanium wires The maximum aperture of the mesh contained in the inner titanium mesh structure is greater than the maximum aperture of the mesh contained in each of the outer titanium mesh structures; the sections of multiple different positions of each of the auxiliary titanium wires are It is welded to one section of the plurality of titanium wires included in the inner titanium mesh structure; the position where each electrode plate is connected to the titanium wire can pass through at least one titanium wire and a plurality of The auxiliary titanium wires jointly establish a conductive path; A plurality of catalyst layers, each of which is provided on at least a part of one of the outer titanium mesh structures, at least a part of one of the inner titanium mesh structures, and one of the electrode plates is provided with the inner titanium one side of the mesh structure; a plurality of membrane electrode groups arranged between two said outer titanium mesh structures; A plurality of sealing rings, one sealing ring is provided between each of the electrode plates and the membrane electrode group, and the periphery of each of the inner titanium mesh structures and the periphery of each of the outer titanium mesh structures are covered by the Surrounded by a sealing ring; the inlet perforation and the outlet perforation of each of the electrode plates are located in the area enclosed by the sealing ring; Two fixing parts, each of the fixing parts has a perforation, and the perforation passes through the fixing part; the two fixing parts hold a plurality of the electrode plates, a plurality of the inner titanium mesh structures, a plurality of the The outer titanium mesh structure, a plurality of catalyst layers, a plurality of membrane electrode groups, and a plurality of sealing rings, and a plurality of inlet perforations jointly form an inlet passage, wherein the said fixing part The perforation is connected with the inlet channel, and a plurality of the outlet perforations jointly form an exit channel, the perforation of the other fixing member is in communication with the exit channel, each of the electrode plates is connected with the inner titanium mesh structure A plurality of the flow channels, the inlet channels and the outlet channels that are commonly formed communicate with each other. The fuel cell according to claim 1, wherein, the pore diameter of each said mesh of each said inner titanium mesh structure is between 0.1 and 1.0 mm, and the pore diameter of each said outer titanium mesh structure is between In 0.05 ~ 0.5 mm. The fuel cell according to claim 1, wherein the maximum pore diameter of each mesh of each inner titanium mesh structure is 2 to 20 times the maximum pore diameter of each mesh of each outer titanium mesh structure. The fuel cell according to claim 1, wherein the overall size of each of the inner titanium mesh structures and the overall size of each of the outer titanium mesh structures are the same, and the mesh number of each of the inner titanium mesh structures is between 50 and 500 mesh, and the mesh of each outer titanium mesh structure is between 80-5000 mesh. The fuel cell according to claim 1, wherein the overall size of each of the inner titanium mesh structures and the overall size of each of the outer titanium mesh structures are the same, and the meshes included in each of the inner titanium mesh structures The number is 1.6 to 100 times the number of the meshes included in each outer titanium mesh structure. The fuel cell according to claim 1, wherein each electrode plate is made of titanium or stainless steel; the catalyst layer is made of platinum, gold or iridium oxide. The fuel cell according to claim 1, wherein each of the inlet perforations has a long side, a short side and two oblique sides, and the two ends of the long side are connected to the two oblique sides The two ends of the short sides are connected to the two inclined sides, and the long sides of each of the inlet perforations are arranged adjacent to a short side of the inner titanium mesh structure; each of the The outlet perforation has a long side, a short side and two oblique sides, the two ends of the long side of the outlet perforation are connected with the two oblique sides of the outlet perforation, the Both ends of the short side of the outlet perforation are connected to the two oblique sides of the outlet perforation, and the long side of each outlet perforation is adjacent to a short side of the inner titanium mesh structure set up. The fuel cell according to claim 1, wherein each of the fixing members has a guide structure, the guide structure is formed with the perforation, a guide channel is provided in the guide structure, and the guide structure The channel communicates with the perforation; the two guiding channels are respectively defined as an entering guiding channel and an exiting guiding channel; one end of the entering guiding channel communicates with the entering channel, and the entering guiding channel The width of the guiding channel gradually expands from the end close to the perforation to the direction of the entering channel; the end of the leaving guiding channel communicates with the leaving channel, and the width of the leaving guiding channel is close to the perforating hole One end gradually expands towards the direction of leaving the channel. A method for manufacturing a fuel cell, which is used to manufacture a fuel cell, the fuel cell comprising a plurality of electrode plates, a plurality of inner titanium mesh structures, a plurality of outer titanium mesh structures, a plurality of catalyst layers, and a plurality of membrane electrodes A group and two fixing parts, the two electrode plates located at the two ends of the fuel cell are respectively defined as an outer electrode plate, and the remaining electrode plates are respectively defined as an inner electrode plate; each of the inner titanium mesh structures Contains a plurality of titanium wires, each of the sections of the titanium wires in different positions overlaps with the different titanium wires, and each of the inner titanium mesh structures contains a plurality of mesh holes; each of the titanium wires The outer titanium mesh structure includes a plurality of auxiliary titanium wires, and the segments at different positions of each of the auxiliary titanium wires are arranged to overlap with different auxiliary titanium wires, and each of the outer titanium mesh structures includes multiple meshes, the maximum aperture of each of the meshes contained in the inner titanium mesh structure is larger than the maximum aperture of the meshes contained in each of the outer titanium mesh structures; the manufacturing method of the fuel cell comprises the following steps : An outer electrode plate manufacturing step: using diffusion welding technology, one side of each of the outer electrode plates is fixed with the inner titanium mesh structure, and the inner titanium mesh structure is opposite to the side of the outer electrode plate One outer titanium mesh structure is fixed, and the positions where each of the outer electrode plates are connected to the titanium wires can jointly establish a conductive path through at least one of the titanium wires and a plurality of auxiliary titanium wires, each The section of the titanium wire that is not welded to the outer electrode plate is correspondingly stacked on one side of the other titanium wire, and each of the titanium wires is not welded to the outer electrode plate The segments together with the outer electrode plate form a plurality of flow channels; A manufacturing step of the inner electrode plate: using diffusion welding technology, one side of each inner electrode plate is fixed with the inner titanium mesh structure, and the inner titanium mesh structure is opposite to the side of the inner electrode plate One outer titanium mesh structure is fixed, and the positions where each of the inner electrode plates are connected to the titanium wires can jointly establish a conductive path through at least one of the titanium wires and a plurality of auxiliary titanium wires, each A section of the titanium wire that is not welded to the inner electrode plate is correspondingly stacked on one side of the other titanium wire, and each of the titanium wires is not welded to the inner electrode plate The segments together with the inner electrode plate form a plurality of flow channels; A catalyst layer forming step: coating a catalyst layer on one side of each of the outer titanium mesh structures, each of the inner titanium mesh structures, and the electrode plates fixed thereto; An assembly step: fixing the two fixing parts to each other, so that a plurality of the electrode plates, a plurality of the inner titanium mesh structures, and a plurality of the membrane electrode groups are held by the two fixing parts; wherein, Each of the membrane electrode groups is located between two inner titanium mesh structures.

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