TWI769113B - 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, two external electrode plates and multiple internal electrode plates, multiple titanium mesh structures, multiple membrane electrode assembly, multiple catalyst layers and multiple sealing rings. A titanium mesh structure is fixed on one side of each external electrode plate through diffusion bonding technology. Two titanium mesh structures are fixed on both sides of each internal electrode plate through diffusion bonding technology. A catalyst layer is provided on one side of each titanium mesh structure. Each membrane electrode assembly is located between two titanium mesh structures, and each titanium mesh structure serves as a gas diffusion layer.

Description

Fuel cell and method for manufacturing fuel cell

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

Existing common fuel cells use carbon cloth as the gas diffusion layer, and the carbon cloth, electrode plates and membrane electrode groups only abut 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 decreases. .

One embodiment of the present invention discloses a fuel cell, which includes: a plurality of electrode plates, a plurality of titanium mesh structures, a plurality of catalyst layers, a plurality of membrane electrode groups, a plurality of sealing rings and two fixing parts. At least one side of each electrode plate has a plurality of flow channels; the two electrode plates located at both 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. One side of each outer electrode plate with multiple flow channels is fixed to each other with a titanium mesh structure by diffusion welding technology, and one side of each inner electrode plate is fixed to each other with a titanium mesh structure by diffusion welding technology. The other side is fixed with another titanium mesh structure by diffusion welding technology; each titanium mesh structure includes multiple titanium wires, and multiple sections of different positions of each titanium wire are respectively arranged to overlap with different titanium wires. Each titanium mesh structure includes a plurality of mesh holes; a plurality of sections at different positions of each titanium wire are welded with the electrode plate, and the position where each electrode plate is welded with the titanium wire can be established by at least one titanium wire. The conductive path, the section where each titanium wire is not welded with the electrode plate, is correspondingly stacked on one side of the other titanium wire. Each catalyst layer is arranged on at least a part of one of the titanium mesh structures and one side of one of the electrode plates where the titanium mesh structure is arranged. A plurality of membrane electrode groups are arranged between the two titanium mesh structures. A sealing ring is arranged between each electrode plate and the membrane electrode group, and the periphery of each titanium mesh structure is surrounded by the sealing ring. The two fixing parts are used to hold a plurality of electrode plates, a plurality of titanium mesh structures, a plurality of catalyst layers, a plurality of membrane electrode groups and a plurality of sealing rings. The gas channel communicates with the plurality of flow channels of the electrode plate.

One embodiment of the present invention discloses a method for manufacturing a fuel cell, which is used to manufacture a fuel cell. The fuel cell includes a plurality of electrode plates, a plurality of titanium mesh structures, a plurality of catalyst layers, 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 remaining electrode plates are respectively defined as an inner electrode plate; each titanium mesh structure includes a plurality of titanium wires, and the A plurality of sections at different positions are respectively arranged to overlap with different titanium wires. Each titanium mesh structure includes a plurality of mesh holes. The manufacturing method of the fuel cell includes the following steps: a manufacturing step of an outer electrode plate: using diffusion welding A titanium mesh structure is fixed on one side of each outer electrode plate, so that the position where each outer electrode plate and the titanium wire are welded can establish a conductive path through at least one titanium wire, and each titanium wire is not welded with the outer electrode plate. The section is correspondingly stacked on one side of another titanium wire; an inner electrode plate manufacturing step: using diffusion welding technology, a titanium mesh structure is fixed on both sides of each inner electrode plate, so that each inner electrode plate is The position welded with the titanium wire can establish a conductive path through at least one titanium wire, and the section where each titanium wire is not welded with the inner electrode plate is correspondingly stacked on one side of the other titanium wire; a catalyst Layer forming step: plating a catalyst layer on one side of each titanium mesh structure and the electrode plate fixed to it; an assembly step: fixing two fixing parts to each other, so that a plurality of electrode plates and a plurality of titanium mesh structures are formed. , a plurality of membrane electrode groups are held by two fixing pieces; wherein, each membrane electrode group is located between two titanium mesh structures.

To sum up, in the fuel cell and the method for manufacturing the fuel cell of the present invention, the titanium mesh structure and the electrode plate are fixed to each other by means of diffusion welding technology, and the catalyst layer is formed on the surface of the titanium mesh structure and all the electrodes. The surface design of the electrode plate, etc., can make the position where the titanium wire of each titanium mesh structure is connected to the electrode plate can still maintain the effect of electrical conduction after long-term use of the fuel cell, thereby maintaining the operation of the fuel cell. efficiency.

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

In the following description, if it is indicated to refer to a specific figure or as shown in a specific figure, it is only used for emphasis in the subsequent description, and most of the related content mentioned appears in the specific figure, However, it is not limited that only the specific drawings may be referred to in this subsequent description. The dimensions and proportions of the various structures shown in the drawings of this embodiment are only drawn for the convenience of the description of the specification, and the dimensions and proportions shown in the drawings do not represent actual The dimensions and proportions of the application.

Please refer to FIG. 1 to FIG. 6 , which are a three-dimensional schematic diagram, an exploded schematic diagram, a schematic diagram of an outer electrode plate, a titanium mesh structure and a sealing ring, an inner electrode plate, and a titanium mesh structure of the first embodiment of the fuel cell of the present invention, respectively. And the schematic diagram of the sealing ring, the partial enlarged schematic diagram of the outer electrode plate.

The fuel cell 100 of this embodiment includes three electrode plates, four titanium mesh structures 3, four catalyst layers 4, two membrane electrode assemblies (MEA) 5, four sealing rings 6, and two fixed item 7. 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.

As shown in FIGS. 3 and 4 , each outer electrode plate 1 has a plurality of flow channels C on one side. For example, one side surface 11 of each of the outer electrode plates 1 may have a plurality of stud structures 12 , and the plurality of the stud structures 12 together form a plurality of the flow paths on one side of the outer electrode plate 1 . channel C, and a plurality of the flow channels C are communicated with each other. The formation of the plurality of flow channels C on one side of each outer electrode plate 1 is not limited to the above description, and the plurality of flow channels C on one side of each outer electrode plate 1 is not limited to be completely complete. interconnected. In different embodiments, the plurality of flow channels C on one side of each outer electrode plate 1 may also be formed by concave on one side of the outer electrode plate 1 . Each of the outer electrode plates 1 has one side of a plurality of flow channels C, which are fixed to each other with a titanium mesh structure 3 by means of Diffusion Bonding Technology.

As shown in FIG. 5 and FIG. 6 , one side of each inner electrode plate 2 has a plurality of flow channels C, and one side of each inner electrode plate 2 is fixed to each other with a titanium mesh structure 3 by means of diffusion welding technology. The other side of the inner electrode plate 2 has a plurality of flow channels C, and the other side of each inner electrode plate 2 is also fixed to another titanium mesh structure 3 by diffusion welding technology. The shapes and forming methods of the plurality of flow channels C on each side of the inner electrode plate 2 can be designed according to requirements, and the content shown in the drawings of this embodiment is only an exemplary aspect.

As shown in FIG. 4 and FIG. 6 , each titanium mesh structure 3 includes a plurality of titanium wires 31 , and a plurality of sections at different positions of each titanium wire 31 are respectively arranged to overlap with different titanium wires 31 . 3 includes a plurality of mesh holes 32. In simple terms, each titanium mesh structure 3 is a three-dimensional woven mesh structure formed by a plurality of titanium wires 31 interwoven with each other. In practical applications, the pore size of the mesh holes 32 may be between 0.05 and 0.5 millimeters (mm).

The sections at different positions of each titanium wire 31 are welded with the outer electrode plate 1 (internal electrode plate 2 ), and the positions where each outer electrode plate 1 (internal electrode plate 2 ) is welded with the titanium wire 31 can be A conductive path is established by at least one titanium wire 31 , and the section of each titanium wire 31 that is not welded with the outer electrode plate 1 (inner electrode plate 2 ) is stacked on one side of the other titanium wire 31 . It should be noted that the overlapping and interweaving manner of the plurality of titanium wires 31 included in each titanium mesh structure 3 shown in the figure in this embodiment is only one of the exemplary aspects. 3. The braiding method of the plurality of titanium wires 31 included can be changed according to requirements.

It should be noted that, in FIG. 4 and FIG. 6 , the part of each titanium wire 31 included in the titanium mesh structure 3 is connected with the convex column structure 12 of the outer electrode plate 1 (the convex column of the inner electrode plate 2 ). The structures 22) are fused to each other as an example, but the titanium mesh structure 3 is not limited to being fused with the plurality of post structures 12 of the outer electrode plate 1 (the post structures 22 of the inner electrode plate 2). In another embodiment in which the side surfaces 11 and 21 of the outer electrode plate 1 and the inner electrode plate 2 are respectively provided with a plurality of convex column structures 12 and 22 , the part of each titanium wire 31 of the titanium mesh structure 3 may also be different from The side surface 11 of the outer electrode plate 1 or the side surface 21 of the inner electrode plate 2 are welded.

In one of the preferred embodiments, the material of each outer electrode plate 1 and each inner electrode plate 2 can be made of titanium, and each outer electrode plate 1 and each inner electrode plate 2 can be, for example, a titanium alloy plate or pure titanium In this way, the connection strength of each titanium wire 31 and the electrode plate (outer electrode plate 1, inner electrode plate 2) can be strengthened, and each titanium wire 31 and (outer electrode plate 1, inner electrode plate 2) are welded together. 2) The position where the phases are welded is not prone to problems such as fracture. 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 FIG. 7, at least a part of each titanium mesh structure 3 is provided with a catalyst layer 4, and each outer electrode plate 1 is provided with a part of the side surface of the titanium mesh structure 3, and each inner electrode plate 2 is provided with a titanium mesh structure 3 A part of the side surface of the device is also provided with a catalyst layer 4 . Specifically, in practical applications, the titanium mesh structure 3 can be fixed on one side of the outer electrode plate 1 by using diffusion welding technology, and then the titanium mesh structure 3 is plated on the side opposite to the outer electrode plate 1 . The catalyst layer 4, alternatively, can be the outer electrode plate 1 fixed with the titanium mesh structure 3 into the electroplating tank for electroplating; similarly, the two titanium mesh structures 3 can be fixed on the inner electrode by first using diffusion welding technology After the two sides of the plate 2, the catalyst layer 4 is plated on the two titanium mesh structures 3 fixed on the inner electrode plate 2, or, the inner electrode plate 2 with the titanium mesh structure 3 fixed on both sides can be directly set. Electroplating is carried out in an electroplating bath. In practical applications, the catalyst layer 4 may be made of platinum, gold or iridium oxide, for example, which is not limited herein.

In different embodiments, the catalyst layer 4 can also be plated on the surface of each titanium mesh structure 3 first, and then the titanium mesh structure 3 plated with the catalyst layer 4 can be welded to each electrode plate by diffusion welding technology. side of track C.

As shown in FIG. 2, FIG. 3 and FIG. 5, a sealing ring 6 is provided between each membrane electrode group 5 and the adjacent outer electrode plate 1 or inner electrode plate 2, and the periphery of each titanium mesh structure 3 is surrounded by The sealing ring 6 is surrounded, and the sealing ring 6 is mainly used to limit the flow range of the gas and the reacted liquid. The number and shape of the sealing rings 6 disposed between each membrane electrode group 5 and the adjacent outer electrode plate 1 or inner electrode plate 2 are not limited to those shown in the figures, and can be changed according to requirements.

The two fixing members 7 hold a plurality of electrode plates (outer electrode plate 1 , inner electrode plate 2 ), a plurality of titanium mesh structures 3 , a plurality of catalyst layers 4 , a plurality of membrane electrode groups 5 and a plurality of sealing rings 6 . In practical applications, the two fixing parts 7 may be fixed to each other by cooperating with a plurality of screws and other components.

In addition, it is worth mentioning that each outer electrode plate 1 may have two through holes 13, and each through hole 13 is provided through the outer electrode plate 1; each inner electrode plate 2 may have two through holes 23, and each through hole 23 penetrates the inner electrode The plate 2 is provided; one of the fixing pieces 7 has a gas inlet 71, the other fixing piece 7 has a gas outlet 72, and the gas inlet 71 of the fixing piece 7, one of the through holes 13 of each outer electrode plate 1 and each inner electrode plate One of the perforations 23 of 2 will form a gas channel together, and the gas outlet 72 of the fixing member 7, the other perforation 13 of each outer electrode plate 1 and the other perforation 23 of each inner electrode plate 2 will jointly form another gas aisle. Each gas channel is communicated with the flow channel C of each electrode plate, and one of the gas channels is used for supplying hydrogen gas into the fuel cell 100 , and the other gas channel is used for supplying oxygen (or air) into the fuel cell 100 . The formation method, appearance, size, etc. of the two gas passages can be designed according to requirements, and the above description is not limited.

As described above, the fuel cell 100 of the present invention uses the titanium mesh structure 3 to replace the carbon cloth (gas diffusion layer) in the conventional fuel cell, and uses the diffusion welding technology to weld the titanium mesh structure 3 to the outer electrode plate 1 . One side and both sides of the inner electrode plate 2, since the partial sections of the plurality of titanium wires 31 included in the titanium mesh structure 3 are welded to each other with the outer electrode plate 1 or the inner electrode plate 2, therefore, the present invention After the fuel cell 100 is used for a long time, the contact impedance between the titanium mesh structure 3 and each electrode plate can still be maintained in a relatively good state.

On the other hand, in the conventional fuel cell, because the carbon cloth and the electrode plate are only in physical contact (the two only abut each other), after the fuel cell is used for a long time, the corrosion problem of the carbon cloth is prone to occur in some areas. As a result, this area cannot conduct electricity, resulting in an increase in the contact resistance between the carbon cloth and the electrode plate, which in turn affects the overall operating efficiency of the fuel cell.

In other words, after the fuel cell 100 of the present invention is used for a long time, each electrode plate (outer electrode plate 1, inner electrode plate 2) and the plurality of titanium wires 31 included in the adjacent titanium mesh structure 3 jointly establish a plurality of The conductive path will be mostly in a state where it can still conduct normally. In contrast, in the conventional fuel cell, after long-term use, the area where the carbon cloth is eroded will cause part of the conductive path to fail.

In addition, it is worth mentioning that most of the carbon cloth of the conventional fuel cell is coated with a catalyst, and for this reason, the manufacturing cost of the entire carbon cloth is relatively high. On the other hand, the manufacturing cost of the titanium mesh structure 3 and the catalyst layer 4 included in the fuel cell 100 of the present invention is relatively cheap, and the fuel cell 100 of the present invention also has the advantage that the manufacturing cost is relatively cheap compared with the conventional fuel cell .

Please refer to FIG. 8 to FIG. 10 , which are respectively an exploded schematic diagram of the second embodiment of the fuel cell of the present invention, a partial enlarged schematic diagram of the titanium mesh structure and the auxiliary titanium mesh structure, and a cross-sectional schematic diagram of the fuel cell. The biggest difference between this embodiment and the previous embodiments is that the fuel cell 200 further includes four auxiliary titanium mesh structures 8 . Each auxiliary titanium mesh structure 8 is fixed to the side of one of the titanium mesh structures 3 opposite to the electrode plate (outer electrode plate 1 or inner electrode plate 2 ) using diffusion welding technology.

Each auxiliary titanium mesh structure 8 includes a plurality of auxiliary titanium wires 81 , and sections at different positions of each auxiliary titanium wire 81 are respectively arranged to overlap with different auxiliary titanium wires 81 , and each auxiliary titanium mesh structure 8 includes a plurality of auxiliary titanium wires 81 . Each of the mesh holes 82 has a maximum aperture diameter of the mesh holes 82 included in each titanium mesh structure 3 greater than the maximum aperture diameter of the mesh holes 82 included in each auxiliary titanium mesh structure 8 . A plurality of sections at different positions of each auxiliary titanium wire 81 are welded with one section of the plurality of titanium wires 31 included in the titanium mesh structure 3 . The position where each electrode plate (outer electrode plate 1 or inner electrode plate 2 ) is connected to the titanium wire 31 can jointly establish a conductive path through at least one titanium wire 31 and a plurality of auxiliary titanium wires 81 .

As shown in FIG. 10 , at least a part of the auxiliary titanium mesh structure 8 , the titanium mesh structure 3 and the electrode plates (outer electrode plate 1 , inner electrode plate 2 ) welded to each other are provided with a catalyst layer 4 . In practical applications, diffusion welding technology can be used to fix the titanium mesh structure 3 and the auxiliary titanium mesh structure 8 on one side of each outer electrode plate 1 , and then the auxiliary titanium mesh structure 8 is opposite to one side of the outer electrode plate 1 . The catalyst layer 4 is electroplated on the side, or the outer electrode plate 1 with the titanium mesh structure 3 and the auxiliary titanium mesh structure 8 fixed thereon can be directly placed in the electroplating tank to perform the electroplating operation of the catalyst layer 4 . Similarly, diffusion welding technology can be used first to fix the titanium mesh structure 3 and the auxiliary titanium mesh structure 8 on both sides of each inner electrode plate 2 respectively, and then the auxiliary titanium mesh structure 3 fixed on the inner electrode plate 2 is fixed. One side of the titanium mesh structure 8 is electroplated with the catalyst layer 4, or, the inner electrode plate 2 with the two titanium mesh structures 3 and the two auxiliary titanium mesh structures 8 can be fixed directly in the electroplating tank for the catalyst layer. Layer 4 plating job.

In one embodiment, the maximum aperture of each mesh hole 32 of each titanium mesh structure 3 may be 2 to 20 times the maximum aperture of each mesh hole 82 of each auxiliary titanium mesh structure 8 . In one embodiment, the diameter of each mesh hole 32 of each titanium mesh structure 3 may be between 0.1 and 1.0 mm, and the diameter of each mesh hole 82 of each auxiliary titanium mesh structure 8 may be between 0.05 and 0.5 mm. mm.

In one embodiment, the overall size of each titanium mesh structure 3 is the same as the overall size of each auxiliary titanium mesh structure 8 (that is, the overall length and width of the titanium mesh structure 3 are the same as the overall length and width of the auxiliary titanium mesh structure 8 . ), and the number of mesh holes 82 included in each auxiliary titanium mesh structure 8 is 1.6 to 100 times the number of mesh holes 32 included in each titanium mesh structure 3 . For example, the mesh number of each auxiliary titanium mesh structure 8 may be between 80 and 5000 mesh, and the mesh number of each titanium mesh structure 3 may be between 50 and 500 mesh.

It should be noted that, in the drawings of this embodiment, the fuel cell 200 includes two auxiliary titanium mesh structures 8 as an example, but the number of the auxiliary titanium mesh structures 8 included in the fuel cell 200 is not limited to two . In the embodiment in which two or more auxiliary titanium mesh structures 8 are arranged between the membrane electrode group 5 and the titanium mesh structure 3 , the closer to the membrane electrode group 5 the mesh holes 82 of the auxiliary titanium mesh structure 8 are, the larger the aperture size is. Small.

Please refer to FIG. 2 to FIG. 7 and FIG. 11 together. FIG. 11 is a schematic flowchart of the first embodiment of the method for manufacturing a fuel cell of the present invention. The method for manufacturing a fuel cell of the present invention is used to manufacture a fuel cell 100. The fuel cell 100 includes a plurality of electrode plates, a plurality of titanium mesh structures 3, a plurality of catalyst layers 4, a plurality of sealing rings 6, and a plurality of membrane electrodes. In the group 5 and the two fixing members 7 , 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 . For the detailed description of the titanium mesh structure 3 , please refer to the foregoing embodiments, which will not be repeated here.

The manufacturing method of the fuel cell includes the following steps:

An outer electrode plate manufacturing step S11: using diffusion welding technology, a titanium mesh structure 3 is fixed on one side of each outer electrode plate 1, so that the position where each outer electrode plate 1 and the titanium wire 31 are welded can pass through at least one titanium wire The wire 31 establishes a conductive path, and the section where each titanium wire 31 is not welded with the outer electrode plate 1 is correspondingly stacked on one side of another titanium wire 31;

An inner electrode plate manufacturing step S12: using diffusion welding technology, a titanium mesh structure 3 is fixed on both sides of each inner electrode plate 2, so that the position where each inner electrode plate 2 and the titanium wire 31 are welded can pass through at least one The titanium wire 31 establishes a conductive path, and the section where each titanium wire 31 is not fused with the inner electrode plate 2 is correspondingly stacked on one side of the other titanium wire 31;

A catalyst layer forming step S13: plating a catalyst layer 4 on one side of each titanium mesh structure 3 and its fixed electrode plate (outer electrode plate 1 or inner electrode plate 2);

An assembly step S14 : fix the two fixing members 7 to each other, so that a plurality of electrode plates (outer electrode plate 1 or inner electrode plate 2 ), a plurality of titanium mesh structures 3 , a plurality of sealing rings 6 , and a plurality of membrane electrode groups 5 is held by two fixtures 7 ; wherein each membrane electrode group 5 is located between the two titanium mesh structures 3 .

In practical applications, in the outer electrode plate manufacturing step S11 , the outer electrode plate 1 may be first placed on the platform of the diffusion welding equipment, and then the titanium mesh structure 3 is placed on the outer electrode plate 1 , and finally, the diffusion Welding technology is used to fuse sections at different positions of each titanium wire 31 of the titanium mesh structure 3 and the outer electrode plate 1 to each other. Similarly, in the manufacturing step S12 of the inner electrode plate, the inner electrode plate 2 can be set on the platform of the diffusion welding equipment first, and then the titanium mesh structure 3 is set on the inner electrode plate 2, and finally, the diffusion welding technology is used. , so that the sections at different positions of each titanium wire 31 of the titanium mesh structure 3 and the inner electrode plate 2 are welded to each other.

In practical applications, in the step S13 of forming the catalyst layer, the catalyst layer 4 may be plated only on one side of each titanium mesh structure 3 and the electrode plate (the outer electrode plate 1 or the inner electrode plate 2 ) fixed thereto. Alternatively, each titanium mesh structure 3 and the electrode plates (outer electrode plate 1 or inner electrode plate 2 ) fixed to each other can be directly placed in an electroplating tank for electroplating.

In practical applications, in the assembling step S14 , for example, a plurality of screws and a plurality of nuts may be used to lock the two fixing members 7 to each other, but the fixing methods of the two fixing members 7 are not limited thereto. In addition, in the assembling step S14, the step of disposing the sealing ring 6 between the membrane electrode group 5 and the adjacent electrode plates is also included.

As described 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 including carbon cloth.

Please refer to FIG. 8 to FIG. 10 and FIG. 12 together. FIG. 12 is a schematic flowchart of a second embodiment of the method for manufacturing a fuel cell of the present invention. One of the differences between the method for manufacturing a fuel cell of this embodiment and the first embodiment of the foregoing method for manufacturing a fuel cell is that the fuel cell 100 manufactured by the method for manufacturing a fuel cell of this embodiment further includes a plurality of Auxiliary titanium mesh structure 8. For the detailed description of the auxiliary titanium mesh structure 8 , please refer to the foregoing embodiments, which will not be repeated here.

The manufacturing method of the fuel cell of this embodiment includes: an outer electrode plate manufacturing step S21 , an inner electrode plate manufacturing step S22 , a catalyst layer forming step S23 and an assembling step S24 . The outer electrode plate manufacturing step S21 of this embodiment is different from the outer electrode plate manufacturing step S11 of the previous embodiment in that: in the outer electrode plate manufacturing step S21, diffusion welding technology is used to fix one side of each outer electrode plate 1 There is a titanium mesh structure 3, and an auxiliary titanium mesh structure 8 is fixed on the side of the titanium mesh structure 3 opposite to the outer electrode plate 1, and the position where each outer electrode plate 1 is connected with the titanium wire can pass through at least one titanium mesh. The wire 31 and the plurality of auxiliary titanium wires 81 together establish a conductive path. Specifically, in practical applications, the outer electrode plate 1 can be placed flat on the platform of the diffusion welding equipment, and the titanium mesh structure 3 is placed on the outer electrode plate 1 first, and then the auxiliary titanium mesh structure 8 is placed on the platform. On the titanium mesh structure 3, then, using diffusion welding technology, the outer electrode plate 1, the titanium mesh structure 3 and the auxiliary titanium mesh structure 8 are welded to each other at one time, and then the titanium mesh structure 3 and the auxiliary titanium mesh structure 8 are fixed. The outer electrode plate 1 is turned over, and another titanium mesh structure 3 and another auxiliary titanium mesh structure 8 are successively placed on the outer electrode plate 1. Finally, diffusion welding technology is used again to make the outer electrode plate 1 and another titanium mesh The mesh structure 3 and the other auxiliary titanium mesh structure 8 are welded to each other at one time.

The inner electrode plate manufacturing step S21 of this embodiment is different from the inner electrode plate manufacturing step S12 of the previous embodiment in that: in the inner electrode plate manufacturing step S21, diffusion welding technology is used to make the two parts of each inner electrode plate 2 . A titanium mesh structure 3 is fixed on the side respectively, and an auxiliary titanium mesh structure 8 is fixed on the side of the titanium mesh structure 3 opposite to the inner electrode plate 2 . Specifically, in practical applications, the inner electrode plate 2 can be placed flat on the platform of the diffusion welding equipment, and the titanium mesh structure 3 is placed on the inner electrode plate 2 first, and then the auxiliary titanium mesh structure 8 is placed on the platform. On the titanium mesh structure 3, the inner electrode plate 2, the titanium mesh structure 3 and the auxiliary titanium mesh structure 8 are welded to each other at one time by diffusion welding technology, and then the titanium mesh structure 3 and the auxiliary titanium mesh structure are fixed. The inner electrode plate 2 of 8 is turned over, and then another titanium mesh structure 3 and another auxiliary titanium mesh structure 8 are placed on the inner electrode plate 2 successively. The titanium mesh structure 3 and the other auxiliary titanium mesh structure 8 are welded to each other at one time.

The inner electrode plate manufacturing step S23 of this embodiment is different from the inner electrode plate manufacturing step S13 of the previous embodiment in that in the catalyst layer forming step S23, each auxiliary titanium mesh structure 8 is opposite to the titanium mesh structure 3 One side of the titanium mesh structure 3 and the side opposite to the electrode plate (outer electrode plate 1 or inner electrode plate 2) are coated with a catalyst layer 4. In practical applications, in the step S23 of forming the catalyst layer, the catalyst layer 4 may be plated only on the side of each outer electrode plate 1 on which the titanium mesh structure 3 and the auxiliary titanium mesh structure 8 are fixed, or it may be The outer electrode plate 1 and the titanium mesh structure 3 and the auxiliary titanium mesh structure 8 fixed to each other are directly put into the relevant electroplating tank for electroplating. Similarly, in the step S23 of forming the catalyst layer, the catalyst layer 4 may be plated only on the side of each inner electrode plate 2 where the titanium mesh structure 3 and the auxiliary titanium mesh structure 8 are fixed, or the inner electrode may be coated with the catalyst layer 4 only. The plate 2 and its mutually fixed titanium mesh structure 3 and auxiliary titanium mesh structure 8 are directly put into the relevant electroplating tank for electroplating.

In the assembly step S24, the two fixing members 7 are fixed to each other, so that a plurality of electrode plates (outer electrode plate 1 or inner electrode plate 2), a plurality of titanium mesh structures 3, a plurality of auxiliary titanium mesh structures 8, A plurality of sealing rings 6 and a plurality of membrane electrode groups 5 are held by two fixing members 7 ; wherein each membrane electrode group 5 is located between the two titanium mesh structures 3 .

To sum up, the fuel cell of the present invention is designed by using the titanium mesh structure as the gas diffusion layer, and making the titanium mesh structure and the electrode plate welded to each other by diffusion welding technology, so that the titanium mesh structure can be used for a long time after the fuel cell is used for a long time. The contact resistance between the electrode plate and the electrode plate will not be greatly improved, so that the fuel cell can 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 a gas diffusion the service life of the fuel cell layer. In the method for manufacturing the fuel cell of the present invention, the titanium mesh structure used to replace the conventional carbon cloth is fixed on the electrode plate by using diffusion welding technology, and the titanium mesh structure is plated on the titanium mesh structure by means of electroplating. The catalyst layer and other methods can effectively reduce the manufacturing cost of the fuel cell.

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

100, 200: fuel cell 1: External electrode plate 11: Side 12: Column structure 13: Perforation 2: Inner electrode plate 21: Side 22: Column structure 23: Perforation 3: Titanium mesh structure 31: Titanium wire 32: mesh 4: Catalyst layer 5: Membrane electrode group 6: sealing ring 7: Fasteners 71: Gas inlet 72: Gas outlet 8: Auxiliary titanium mesh structure 81: Auxiliary titanium wire 82: mesh C: runner S11, S12, S13, S14: Process steps S21, S22, S23, S24: process steps

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

FIG. 2 is an exploded schematic view of the first embodiment of the fuel cell of the present invention.

3 is a schematic diagram of the outer electrode plate, the titanium mesh structure and the sealing ring of the first embodiment of the fuel cell of the present invention.

FIG. 4 is a partial enlarged schematic view of FIG. 3 .

5 is a schematic diagram of the inner electrode plate, the titanium mesh structure and the sealing ring of the first embodiment of the fuel cell of the present invention.

FIG. 6 is a partial enlarged schematic view of FIG. 5 .

FIG. 7 is a schematic cross-sectional view along the line VII-VII of FIG. 1 .

FIG. 8 is an exploded schematic view of the second embodiment of the fuel cell of the present invention.

9 is a partial enlarged schematic view of the titanium mesh structure and the auxiliary titanium mesh structure of the second embodiment of the fuel cell of the present invention.

10 is a schematic cross-sectional view of a second embodiment of the fuel cell of the present invention.

FIG. 11 is a schematic flow chart of the first embodiment of the manufacturing method of the fuel cell of the present invention.

FIG. 12 is a schematic flow chart of the second embodiment of the method for manufacturing a fuel cell of the present invention.

100: Fuel Cell

1: External electrode plate

11: Side

13: Perforation

2: Inner electrode plate

21: Side

23: Perforation

3: Titanium mesh structure

5: Membrane electrode group

6: sealing ring

7: Fasteners

71: Gas inlet

72: Gas outlet

Claims (10)

A fuel cell comprising: A plurality of electrode plates, at least one side of each electrode plate has a plurality of flow channels; the two electrode plates located at both ends of the fuel cell are respectively defined as an outer electrode plate, and the remaining electrode plates are defined respectively is an inner electrode plate; A plurality of titanium mesh structures, one side of each of the outer electrode plates with a plurality of the flow channels is fixed with one of the titanium mesh structures by diffusion welding technology, and one side of each of the inner electrode plates is welded by diffusion welding. The technology is mutually fixed with one of the titanium mesh structures, and the other side of each of the inner electrode plates is fixed with the other titanium mesh structure by diffusion welding technology; each of the titanium mesh structures includes a plurality of titanium wires, each of which is The sections of a plurality of different positions of the titanium wires are respectively arranged to overlap with the different titanium wires, and each of the titanium mesh structures includes a plurality of mesh holes; a plurality of different positions of each of the titanium wires The segment is welded with the electrode plate, and each position where the electrode plate is welded with the titanium wire can establish a conductive path through at least one of the titanium wires, and each of the titanium wires is not connected to all the titanium wires. The section where the electrode plates are welded is correspondingly stacked on one side of the other titanium wire; A plurality of catalyst layers, each of the catalyst layers is arranged on at least a part of one of the titanium mesh structures and one side of the electrode plate where the titanium mesh structure is arranged; a plurality of membrane electrode groups, which are arranged between the two titanium mesh structures; a plurality of sealing rings, one of which is arranged between each of the electrode plates and the membrane electrode group, and the periphery of each of the titanium mesh structures is surrounded by the sealing ring; Two fixing pieces are used to hold a plurality of the electrode plates, a plurality of the titanium mesh structures, a plurality of the catalyst layers, a plurality of the membrane electrode groups and a plurality of the sealing rings, each of the The fixing member and the plurality of the electrode plates together form a gas channel, and each of the gas channels communicates with the plurality of the flow channels of the electrode plate. The fuel cell according to claim 1, wherein the pore size of each of the meshes is between 0.05 and 0.5 mm. The fuel cell according to claim 1, wherein the material of each of the electrode plates comprises titanium or stainless steel; the material of the catalyst layer comprises platinum, gold or iridium oxide. The fuel cell according to claim 1, wherein the fuel cell further comprises a plurality of auxiliary titanium mesh structures, and each of the auxiliary titanium mesh structures is fixed to each of the titanium mesh structures by means of diffusion welding technology, opposite to the electrodes. On the side where the plates are fixed to each other, each of the auxiliary titanium mesh structures includes a plurality of auxiliary titanium wires, and a plurality of sections at different positions of each of the auxiliary titanium wires are respectively arranged to overlap with the different auxiliary titanium wires, Each of the auxiliary titanium mesh structures includes a plurality of meshes, and the maximum aperture of the meshes included in each of the titanium mesh structures is greater than the maximum aperture of the meshes included in each of the auxiliary titanium mesh structures; A plurality of sections of the auxiliary titanium wires at different positions are welded with one section of a plurality of the titanium wires included in the titanium mesh structure; each of the electrode plates is connected with the titanium wires position, a conductive path can be jointly established by at least one of the titanium wires and a plurality of the auxiliary titanium wires. The fuel cell according to claim 4, wherein each of the catalyst layers is further provided on at least a part of each of the auxiliary titanium mesh structures. The fuel cell according to claim 4, wherein the maximum pore size of each of the mesh holes of each of the titanium mesh structures is 2 to 20 times the maximum pore size of the mesh holes of each of the auxiliary titanium mesh structures. The fuel cell according to claim 4, wherein the aperture of each mesh hole of each of the titanium mesh structures is between 0.1 and 1.0 mm, and the aperture of each of the mesh holes of each of the auxiliary titanium mesh structures is between 0.05 to 0.5 mm. The fuel cell according to claim 4, wherein the overall size of each of the titanium mesh structures is the same as the overall size of each of the auxiliary titanium mesh structures, and the number of meshes included in each of the auxiliary titanium mesh structures , which is 1.6 to 100 times the number of the meshes contained in each of the titanium mesh structures. A manufacturing method of a fuel cell, which is used to manufacture a fuel cell, the fuel cell comprises a plurality of electrode plates, a plurality of titanium mesh structures, a plurality of catalyst layers, a plurality of membrane electrode groups and two fixing parts, located at The two electrode plates at both 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 titanium mesh structures includes a plurality of titanium wires, each of which is A plurality of sections of the titanium wire at different positions are respectively arranged to overlap with the different titanium wires, each of the titanium mesh structures includes a plurality of mesh holes, and the manufacturing method of the fuel cell includes the following steps: An outer electrode plate manufacturing step: using diffusion welding technology, a titanium mesh structure is fixed on one side of each outer electrode plate, so that the position where each outer electrode plate and the titanium wire are welded can pass through At least one of the titanium wires establishes a conductive path, and the sections of each of the titanium wires that are not welded with the outer electrode plate are correspondingly stacked on one side of the other titanium wire; An inner electrode plate manufacturing step: using diffusion welding technology, a titanium mesh structure is fixed on both sides of each inner electrode plate, so that the position where each inner electrode plate and the titanium wire are welded can be A conductive path is established through at least one of the titanium wires, and the section of each of the titanium wires that is not welded with the inner electrode plate is correspondingly stacked on one side of the other titanium wire; A catalyst layer forming step: plating a catalyst layer on one side of each of the titanium mesh structure and the electrode plate fixed to it; An assembling step: fixing the two fixing pieces to each other, so that a plurality of the electrode plates, a plurality of the titanium mesh structures, and a plurality of the membrane electrode groups are held by the two fixing pieces; wherein, each The membrane electrode group is located between the two titanium mesh structures. The method for manufacturing a fuel cell according to claim 9, wherein the fuel cell manufactured by the method for manufacturing a fuel cell further includes a plurality of auxiliary titanium mesh structures, and each of the auxiliary titanium mesh structures includes a plurality of Auxiliary titanium wires, a plurality of sections at different positions of each auxiliary titanium wire are respectively arranged to overlap with different auxiliary titanium wires, each of the auxiliary titanium mesh structures includes a plurality of mesh holes, and each of the auxiliary titanium wires The maximum aperture of the meshes included in the titanium mesh structure is larger than the maximum aperture of the meshes included in each of the auxiliary titanium mesh structures; in the manufacturing step of the outer electrode plate, diffusion welding technology is used to make each One of the titanium mesh structures is fixed on one side of the outer electrode plate, and the auxiliary titanium mesh structure is fixed on one side of the titanium mesh structure opposite to the outer electrode plate, and each of the outer electrodes is fixed with the auxiliary titanium mesh structure. At the position where the plate is connected to the titanium wire, a conductive path can be jointly established by at least one of the titanium wires and a plurality of the auxiliary titanium wires; in the manufacturing step of the inner electrode plate, diffusion welding technology is used to make the One of the titanium mesh structures is fixed on both sides of each of the inner electrode plates, and one of the auxiliary titanium mesh structures is fixed on the side of the titanium mesh structure opposite to the inner electrode plate; In the step of forming the medium layer, the catalyst layer is plated on the side of each of the auxiliary titanium mesh structures opposite to the titanium mesh structure, and the side of each of the titanium mesh structures opposite to the electrode plate ; In the assembling step, the two fixing members are fixed to each other, so that a plurality of the electrode plates, a plurality of the titanium mesh structures, a plurality of the auxiliary titanium mesh structures, and a plurality of the membranes The electrode group is held by the two said holders.

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