JP2005032607A - Fuel cell junction, fuel cell, and method of manufacturing fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell junction, a fuel cell, and a method of manufacturing a fuel cell capable of maintaining the power generation efficiency by preventing deformation of an electrolyte membrane. <P>SOLUTION: The electrolyte is held with specific tension applied thereto with a reinforcing frame having through-holes. A plurality of junctions are stacked and a fastening member is inserted into the through-holes. Pressure is applied to the junction by fastening the fastening member. Alignment of the junction is made easy by making the through-holes greater than the diameter of the fastening member or making an inner periphery of the reinforcing frame and an outer periphery of a separator into substantially the same shapes. After fastening the fastening member, an outer periphery of the reinforcing frame is separated so as to simplify the manufacturing process and reduce the fuel cell in size. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fuel cell assembly, a fuel cell, and a fuel cell manufacturing method, and more particularly to a stack cell type fuel cell in which a plurality of power generation cells and separators are stacked, a fuel cell manufacturing method, and a fuel cell assembly used therefor. It is.

  A fuel cell is a power generation element that generates power by electrochemically reacting, for example, hydrogen gas (fuel gas) and oxygen (oxidant gas) contained in air. In recent years, fuel cells have attracted attention as power generation elements that do not pollute the environment because the product generated by power generation is water. For example, attempts have been made to use them as drive power sources for driving automobiles. Yes.

  Furthermore, not only the above-described driving power source for driving automobiles but also fuel cells are actively developed as driving power sources for portable electronic devices such as notebook computers, mobile phones, and PDAs. In such a fuel cell, it is important that the required power can be stably output and the size and weight are portable, and various technologies have been actively developed to meet such demands. Yes.

  Fuel cells are classified into various types depending on the difference in electrolytes and the like, and representatively, fuel cells using a solid polymer electrolyte as an electrolyte are known. A solid polymer electrolyte fuel cell can be reduced in cost, can be easily reduced in size and weight, and has a high output density in terms of battery performance. In addition, a stack cell type fuel cell configured by alternately stacking a plurality of power generation cells and separators has also been proposed.

JP 7-65847 A

  In a stack cell type fuel cell, a plurality of power generation cells having a structure in which an electrolyte membrane is sandwiched between current collectors are stacked, and power is generated by supplying fuel and oxygen to the power generation cells of each layer. However, when the electrolyte membrane contains moisture, deformation such as local shrinkage or formation of wrinkles on the surface occurs, and the true contact area between the current collector and the electrolyte membrane is reduced. There was a problem of being lowered.

  Accordingly, it is an object of the present invention to provide a fuel cell assembly, a fuel cell, and a fuel cell manufacturing method capable of maintaining the power generation efficiency by preventing deformation of the electrolyte membrane.

  In order to solve the above problems, a fuel cell assembly of the present invention is a fuel cell assembly in which an electrolyte is sandwiched between current collectors, and is formed on the outer periphery of the electrolyte to apply a predetermined tension to the electrolyte. It has the reinforcement frame to hold | maintain, It is characterized by the above-mentioned.

  Since the joined body has a reinforcing frame that holds the electrolyte by applying a predetermined tension, even when the wet state of the electrolyte changes, the problem that the electrolyte shrinks or wrinkles are formed on the surface is reduced. Therefore, it is possible to prevent the deformation of the electrolyte and maintain the power generation efficiency. In addition, since the adhesion with the airtight member in contact with the electrolyte is also improved, the airtightness can be improved even when the joined body is used in a fuel cell having a stack cell structure.

  In addition, since a through-hole into which a fastening member for applying a pressing force to the fuel cell assembly is inserted is opened in the reinforcing frame, a plurality of assemblies are stacked to form a fuel cell having a stack cell structure. The handling at the time of forming becomes easy, and it becomes possible to improve the assembly property and improve the yield. Further, by positioning the through-hole in the fastening member, it is possible to easily adjust the positional relationship between the joined body and the other member before applying pressure to the joined body with the fastening member. It is possible to simplify the manufacturing process. Further, by forming the reinforcing frame on the entire circumference of the electrolyte, it is possible to more effectively prevent the electrolyte from being deformed.

  In order to solve the above problem, the fuel cell of the present invention is a fuel cell having a stack cell structure in which a joined body in which an electrolyte is sandwiched between current collectors and a separator in which a gas flow path is formed is stacked. A reinforcing frame in which a predetermined tension is applied to the electrolyte and held therein, and a through-hole serving as an opening is formed; and a fastening member that is inserted into the through-hole and applies a pressing force to each joined body. It is characterized by that.

  Since the fuel cell has a reinforcing frame that holds the electrolyte by applying a predetermined tension, even when the wet state of the electrolyte changes, the problem that the electrolyte shrinks or wrinkles are formed on the surface is reduced. Therefore, it is possible to prevent the deformation of the electrolyte and maintain the power generation efficiency. In addition, since the adhesion with the airtight member in contact with the electrolyte is also improved, the airtightness can be improved even when the joined body is used in a fuel cell having a stack cell structure. In addition, by inserting a fastening member into the through hole and applying a pressing force to the joined body, it becomes easy to handle when stacking a plurality of joined bodies to form a stack cell structure, improving assembly and improving yield. Can be improved.

  In addition, the positional relationship between the joined body and other members can be easily adjusted before the pressing force is applied to the joined body by the fastening member by positioning the through hole with the fastening member. Therefore, the manufacturing process can be simplified. Furthermore, by making the inner periphery of the reinforcing frame and the outer periphery of the separator substantially the same shape, the separator and the reinforcing frame can be aligned without interfering with each other when the separator and the bonded body are stacked. It is possible to easily adjust the position in the manufacturing process.

  In addition, in order to solve the above-described problem, the fuel cell manufacturing method of the present invention has a stack cell structure in which a plurality of assemblies each having an electrolyte sandwiched by a current collector and a separator having a gas flow path are stacked. A manufacturing method of a fuel cell to be formed, wherein a predetermined tension is applied to and held by the reinforcing frame in which a through-hole is formed, and a plurality of the joined bodies are overlapped to insert a fastening member into the through-hole. Then, a pressing force is applied to the joined body by fastening the fastening member.

  By holding a predetermined tension on the electrolyte with the reinforcing frame, it is possible to reduce the problem that the electrolyte shrinks or wrinkles are formed on the surface even when the electrolyte wet state changes. It is possible to prevent power generation and maintain power generation efficiency. In addition, since the adhesion with the airtight member in contact with the electrolyte is also improved, the airtightness can be improved even when the joined body is used in a fuel cell having a stack cell structure.

  In addition, by adjusting the relative positional relationship between the plurality of joined bodies after inserting the fastening member into the through hole, the relative positional relationship between the joined bodies can be easily adjusted to form the fuel cell. The manufacturing process can be simplified. Also, by cutting the outer periphery of the reinforcing frame after fastening the fastening member, it is possible to adjust the outer shape after forming the fuel cell without adjusting the outer shape at the time of forming the joined body, thus simplifying the manufacturing process. It is possible to reduce the size and weight of the fuel cell finally obtained. Further, the reinforcing frame may be removed after the fastening member is fastened. By forming the stack cell structure and fastening each layer, the adhesion between the current collector and the electrolyte is ensured, so it is possible to further reduce the weight of the fuel cell by removing the reinforcing frame Become.

  Since the joined body has a reinforcing frame that holds the electrolyte by applying a predetermined tension, even when the wet state of the electrolyte changes, the problem that the electrolyte shrinks or wrinkles are formed on the surface is reduced. Therefore, it is possible to prevent the deformation of the electrolyte and maintain the power generation efficiency. In addition, since the adhesion with the airtight member in contact with the electrolyte is also improved, the airtightness can be improved even when the joined body is used in a fuel cell having a stack cell structure.

  Hereinafter, a fuel cell assembly to which the present invention is applied, a fuel cell, and a method for manufacturing the fuel cell will be described in detail with reference to the drawings. The present invention is not limited to the following description, and can be appropriately changed without departing from the gist of the present invention. In the fuel cell assembly, fuel cell, and fuel cell manufacturing method of the present invention, a mixed solution of methanol and water, hydrogen gas, or the like can be used as the fuel, and the type of fuel and oxidant used for power generation is not limited. To do.

  FIG. 1 is an exploded perspective view showing a configuration of a stack cell type fuel cell of the present invention. The joined body 4 in which the reinforcing frame 3 is formed at the peripheral portion by combining the electrolyte 1 and the current collector 2 and the separator 5 in which the air flow path and the fuel flow path are formed on both surfaces are alternately laminated, A stack cell structure of a fuel cell is formed by disposing end plates 6 on the outside of the separator 5. An airtight member 7 is disposed between each separator 5 and the joined body 4 so that oxygen, fuel, and the like do not leak. Further, the bolts 9 are inserted into the fastening holes 8 formed in the vicinity of the outer periphery of the end plate 6 so that the joined body 4 disposed between the two end plates 6, the separator 5, and the airtight member 7 are not separated. And is fastened with a nut 10.

  As shown in FIG. 2 with an external perspective view and with an exploded perspective view in FIG. 3, the joined body 4 sandwiches the electrolyte 1 between the two current collectors 2, and the reinforcing frames 3 are placed on both sides of the outer periphery of the electrolyte 1. It has an attached structure. A plurality of through holes 12 are formed in the outer peripheral portion of the electrolyte 1, and the through holes 11 are formed in positions corresponding to the through holes 12 in the outer peripheral portion of the reinforcing frame 3. The electrolyte 1 is a rectangular membrane formed of a material having proton permeability, ion permeability, oxidation resistance, and heat resistance. For example, a perfluorosulfonic acid polymer is used.

  The current collector 2 is an electrode material for taking out the generated electromotive force, and is configured using a metal material, a carbon material, a conductive nonwoven fabric, or the like. When a carbon-based material is used as the current collector 2, a catalyst such as platinum may be supported on the porous surface of the carbon-based material, and a catalyst layer is provided on the surface of the current collector 2 that contacts the electrolyte 1. Is formed, and a power generation reaction occurs at the contact portion between the catalyst layer and the electrolyte 1. The catalyst layer is made of a material that promotes a chemical reaction at the interface between the electrolyte 1 and the current collector 2, and has a structure in which, for example, carbon particles carrying platinum on a carbon fiber film are provided.

  The reinforcing frame 3 is a frame-shaped member, and is formed of a non-conductive resin such as PEEK (polyether ether ketone), PEI (polyetherimide), or Teflon (registered trademark). The outer shape of the reinforcing frame 3 is substantially the same size as the electrolyte 1 and the end plate 6, and a through hole 11 for inserting a bolt 9 is formed at a position corresponding to the through hole 12 formed in the electrolyte 1. Yes. The electrolyte 1 and the reinforcing frame 3 are bonded by an adhesive or the like while the electrolyte 1 is pulled with a predetermined tension, and the electrolyte 1 is held by the reinforcing frame 3 with a predetermined tension. Since the electrolyte 1 is pulled by the reinforcing frame 3 with a predetermined tension, it is possible to suppress a problem that the electrolyte 1 is contracted or wrinkles are formed, so that the contact between the electrolyte 1 and the current collector 2 is good. Thus, the real contact area increases and the power generation efficiency of the fuel cell can be improved.

  Adhesion between the reinforcing frame 3 and the electrolyte 1 may be welding, thermocompression bonding, or ultrasonic bonding. Alternatively, after the through hole 11 is formed in the reinforcing frame 3 and the through hole 12 is formed in the electrolyte 1, the electrolyte 1 and the reinforcing frame 3 may be bonded, or after the electrolyte 1 and the reinforcing frame 3 are bonded, the through hole 11 and the through-hole 12 may be formed collectively. Further, in FIG. 3, two reinforcing frames 3 are prepared and bonded to both surfaces of the electrolyte 1 to form the joined body 4. However, as shown in FIG. 4, a folded portion 13 is formed on the outer periphery of the reinforcing frame 3. In addition, the folded portion 13 may be folded after the one surface of the electrolyte 1 is bonded to the reinforcing frame 3, and the folded portion 13 may be bonded to the opposite surface of the electrolyte 1.

  Furthermore, the diameters of the through holes 11 formed at the four corners of the reinforcing frame 3 are made substantially the same as the diameters of the bolts 9 so that the joined bodies 4 can be aligned when the joined bodies 4 are overlapped and fastened. You may do it. By arranging the through holes 11 at the four corners of the reinforcing frame 3 as alignment holes, when stacking the joined body 4, the airtight member 7, and the separator 5, stacking stack cells by adjusting the positional relationship of each member. Therefore, the position adjustment in the manufacturing process of the fuel cell can be easily performed, and the manufacturing can be simplified.

  The separator 5 is a plate-like member in which a fuel flow path that is a plurality of grooves is formed on one surface, and an air flow path that is a plurality of grooves is formed on the other surface. Each separator 5 is disposed such that the surface on which the fuel flow path is formed faces the fuel electrode side of the assembly 4 and the surface on which the air flow path is formed faces the oxygen electrode side of the assembly 4. Fuel gas supplied from the outside of the fuel cell flows through the fuel flow path, air containing oxygen supplied from the outside of the fuel cell flows through the air flow path, and oxygen is supplied to the oxygen electrode side of the assembly 4. Then, fuel is supplied to the fuel electrode side. The separator 5 has substantially the same shape as the inner periphery of the reinforcing frame 3, and the size is the same as or smaller than the inner periphery of the reinforcing frame 3, so that the reinforcing frame 3 and the separator 5 do not interfere with each other or the inner periphery of the reinforcing frame 3. And the separator 5 is arranged so that the outer periphery thereof is flush.

  The airtight member 7 is a ring-shaped member that is disposed between the separator 5 and the joined body 4 and maintains airtightness so that fuel and air do not leak from between the separator 5 and the joined body 4. The size of the airtight member 7 is larger than the outer periphery of the current collector 2 and smaller than the outer periphery of the separator 5, and is sandwiched between the electrolyte 1 and the separator 5 so as to surround the outer periphery of the current collector 2. Therefore, even if the fuel flowing through the fuel flow path formed in the separator 5 or the oxygen flowing through the air flow path is supplied to the current collector 2, the fuel or oxygen does not leak between the separator 5 and the electrolyte 1. .

In power generation in the joined body 4, the current collector 2 on the fuel electrode side receives fuel from the fuel flow path formed in the separator 5, and the current collector 2 on the air electrode side receives air from the air flow path formed in the separator 5. Air is received, and a reaction such as H ₂ → 2H ⁺ + 2e ^{− and} a reaction such as 1 / 2O ₂ + 2H ⁺ + 2e ⁻ = H ₂ O occur in the bonded body 4, and as a result, water is generated. For example, when hydrogen gas is used as fuel, hydrogen gas (H ₂ ) generates protons in the catalyst layer formed on the current collector 2 on the fuel electrode side, and dissociated protons (H ⁺ ) It moves in the membrane of the electrolyte 1 from the current collector 2 toward the current collector 2 on the oxygen electrode side. The moved protons react with oxygen (air) in the vicinity of the catalyst layer formed on the current collector 2 on the oxygen electrode side, and thereby a desired electromotive force is taken out.

  The end plate 6 is a rectangular flat plate member, and a fastening hole 8 through which a bolt 9 is passed is formed in the vicinity of the outer periphery. The end plate 6 has an outer shape larger than that of the separator 5 and the airtight member 7 and has substantially the same shape as the reinforcing frame 3 formed on the outer periphery of the joined body 4. The positions where the fastening holes 8 are formed are positions corresponding to the through holes 12 formed in the electrolyte 1 and the through holes 11 formed in the reinforcing frame 3, and the end plate 6 is fastened to the fastening holes 8 through bolts 9. In this case, the fastening is performed with the bolt 9 inserted in the through holes 11 and 12. When the end plate 6 is fastened, the bolt 9 is in a position where it does not interfere with the separator 5 and the airtight member 7. Further, the end plate 6 is a member for applying a pressing force to each member by fastening the bolt 9 to bring the members into close contact with each other. The end plate 6 has a rigidity that does not easily deform when the bolt 9 is screwed. It is desirable to form with the material which has.

  FIG. 5 shows a state in which a stack cell type fuel cell according to the present invention is formed by laminating a plurality of joined bodies 4 between two end plates 6 and fastening each member through a bolt 9 in a fastening hole 8. FIG. Since the joined body 4 on which the reinforcing frame 3 is formed is overlapped and the bolts 9 are inserted into the through holes 11 and all layers are fastened, the assemblability when manufacturing the stack cell type fuel cell is improved and the yield is increased. Can be improved.

  In addition, after the outer shape of the electrolyte 1 and the reinforcing frame 3 is formed larger than the final outer shape of the stack cell type fuel cell, a joined body 4 is formed, and a plurality of joined bodies 4 are stacked and fastened with bolts 9. The electrolyte 1 and the reinforcing frame 3 present on the outer peripheral portion of the joined body 4 may be cut off. Thus, the outer shape can be adjusted after forming the fuel cell without adjusting the outer shape when the joined body 4 is formed, thereby simplifying the manufacturing process and reducing the size and weight of the finally obtained fuel cell. It becomes possible. Further, the reinforcing frame 3 may be removed after the plurality of joined bodies 4 are stacked and fastened with the bolts 9. By forming the stack cell structure and fastening each layer, the adhesion between the current collector 2 and the electrolyte 1 is ensured. Therefore, the weight of the fuel cell can be further reduced by removing the reinforcing frame 3. Is possible.

  FIG. 6 is a cross-sectional view showing a state where the stack cell type fuel cell of the present invention shown in FIG. 5 is formed. In FIG. 6, only the end plate 6 and the joined body 4 adjacent thereto are shown, but a plurality of joined bodies 4 are stacked in the lower part of the figure. A current collector 2 is disposed on both surfaces of the electrolyte 1, and a reinforcing frame 3 is bonded to the outer periphery of the electrolyte 1. An airtight member 7 is disposed between the current collector 2 and the reinforcing frame 3, and the current collector 2 and the airtight member 7 are sandwiched between separators 5. Bolts 9 are inserted into the fastening holes 8 of the end plate 6 and the through holes 11 of the reinforcing frame 3 and fastened by the bolts 9 and nuts 10 to form a stack cell structure.

  As shown in FIG. 6, the separator 5 has a shape substantially the same as the inner periphery of the reinforcing frame 3 and is arranged so that the inner periphery of the reinforcing frame 3 and the outer periphery of the separator 5 are flush with each other. When the bodies are stacked, the separator and the reinforcing frame do not interfere with each other, so that the separator can be aligned, and the position can be easily adjusted in the manufacturing process. Further, if the diameter of the through hole 11 is substantially the same as the diameter of the bolt 9, the bolt 9 is fitted into the through hole 11 by inserting the bolt 9 into the through hole 11, and the adjacent joined bodies 4 are formed. The position of the through-hole 11 is determined. Therefore, it is possible to easily align the separator 5 and the joined body 4 by aligning the inner peripheral positions of the reinforcing frames 3 of the adjacent joined bodies 4.

  7a to 7c are process diagrams showing another example of the method for manufacturing a fuel cell assembly according to the present invention. As shown in FIG. 7a, a plurality of current collectors 2 each having a catalyst layer are disposed on an electrolyte 1 having a larger area than the joined body 4 finally obtained. Next, as shown in FIG. 7 b, the reinforcing frame 3 is disposed around the current collector 2 so as to surround the current collector 2. Here, in FIG. 7a and FIG. 7b, only one surface of the electrolyte 1 is shown and described, but the current collector 2 and the reinforcing frame 3 are similarly arranged on the back surface of the electrolyte 1 that is not shown in the drawing. Shall. Next, as shown in FIG. 7 c, the electrolyte 1 is cut and separated along the outer periphery of the reinforcing frame 3 to form a through hole 11 in the reinforcing frame 3, so that the electrolyte 1 shown in FIG. A joined body 4 sandwiched between the current collector 2 and the reinforcing frame 3 is obtained.

  Here, the reinforcing frame 3 is disposed after the current collector 2 is disposed on the electrolyte 1. However, the current collector 2 may be disposed after the reinforcing frame 3 is disposed on the electrolyte 1. Further, the through hole 11 may be formed before the electrolyte 1 is cut and the joined body 4 is separated. Various methods such as adhesion using an adhesive, welding, thermocompression bonding, and ultrasonic bonding can be used to bond the reinforcing frame 3 and the electrolyte 1.

  Since the joined body has a reinforcing frame that holds the electrolyte by applying a predetermined tension, even when the wet state of the electrolyte changes, the problem that the electrolyte shrinks or wrinkles are formed on the surface is reduced. Therefore, it is possible to prevent the deformation of the electrolyte and maintain the power generation efficiency. In addition, since the adhesion with the airtight member in contact with the electrolyte is also improved, the airtightness can be improved even when the joined body is used in a fuel cell having a stack cell structure. Further, by forming the reinforcing frame on the entire circumference of the electrolyte, it is possible to more effectively prevent the electrolyte from being deformed.

  In addition, since a through-hole into which a fastening member for applying a pressing force to the fuel cell assembly is inserted is opened in the reinforcing frame, a plurality of assemblies are stacked to form a fuel cell having a stack cell structure. The handling at the time of forming becomes easy, and it becomes possible to improve the assembly property and improve the yield. Further, by positioning the through-hole in the fastening member, it is possible to easily adjust the positional relationship between the joined body and the other member before applying pressure to the joined body with the fastening member. It is possible to simplify the manufacturing process.

  Furthermore, by making the inner periphery of the reinforcing frame and the outer periphery of the separator substantially the same shape, the separator and the reinforcing frame can be aligned without interfering with each other when the separator and the bonded body are stacked. It is possible to easily adjust the position in the manufacturing process.

  In addition, by adjusting the relative positional relationship between the plurality of joined bodies after inserting the fastening member into the through hole, the relative positional relationship between the joined bodies can be easily adjusted to form a fuel cell. The manufacturing process can be simplified. Further, by cutting the outer periphery of the reinforcing frame after fastening the fastening member, it is possible to adjust the outer shape after forming the fuel cell without adjusting the outer shape at the time of forming the joined body, thus simplifying the manufacturing process. It is possible to reduce the size and weight of the fuel cell finally obtained. Further, the reinforcing frame may be removed after the fastening member is fastened. By forming the stack cell structure and fastening each layer, the adhesion between the current collector and the electrolyte is ensured, so it is possible to further reduce the weight of the fuel cell by removing the reinforcing frame Become.

It is a disassembled perspective view which shows the example of a stack cell structure and manufacturing method of the fuel cell of this invention. It is an external appearance perspective view which shows the structural example of the fuel cell assembly used for the fuel cell of this invention. It is a disassembled perspective view which shows the structural example and manufacturing method example of a fuel cell assembly used for the fuel cell of this invention. It is a disassembled perspective view which shows the other structural example of the fuel cell assembly of this invention. It is an external appearance perspective view which shows the state which assembled the fuel cell of this invention. It is sectional drawing which shows the state which assembled the fuel cell of this invention. It is process drawing which shows the other example of the manufacturing method of the fuel cell assembly of this invention, and is a perspective view which shows the state which has arrange | positioned the electrical power collector on electrolyte. It is process drawing which shows the other example of the manufacturing method of the fuel cell assembly of this invention, and is a perspective view which shows the state which has arrange | positioned the reinforcement frame on the electrolyte. It is process drawing which shows the other example of the manufacturing method of the fuel cell assembly of this invention, and is a perspective view which shows the state which cut | disconnected electrolyte and isolate | separated each assembly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrolyte 2 Current collector 3 Reinforcement frame 4 Joined body 5 Separator 6 End plate 7 Airtight member 8 Fastening hole 9 Bolt 10 Nut 11, 12 Through-hole 13 Folded part

Claims (11)

A fuel cell assembly in which an electrolyte is sandwiched between current collectors,
A fuel cell assembly comprising a reinforcing frame formed on an outer peripheral portion of the electrolyte to hold the electrolyte by applying a predetermined tension.   The fuel cell assembly according to claim 1, wherein a through hole into which a fastening member for applying a pressing force to the fuel cell assembly is inserted is opened in the reinforcing frame.   The fuel cell assembly according to claim 2, wherein the through hole is positioned by fitting into the fastening member.   The fuel cell assembly according to claim 1, wherein the reinforcing frame is formed on the entire circumference of the electrolyte. A fuel cell having a stack cell structure in which a joined body in which an electrolyte is sandwiched between current collectors and a separator in which a gas flow path is formed is stacked,
Reinforcing frame in which a predetermined tension is applied to the electrolyte and held, and a through hole that is an opening is formed;
A fuel cell comprising: a fastening member that is inserted into the through hole and applies a pressing force to each joined body.   The fuel cell according to claim 5, wherein the through hole is positioned by being fitted to the fastening member.   6. The fuel cell according to claim 5, wherein the inner periphery of the reinforcing frame and the outer periphery of the separator have substantially the same shape. A method of manufacturing a fuel cell in which a stacked body is formed by laminating a plurality of assemblies in which an electrolyte is sandwiched between current collectors and a separator having a gas flow path,
Applying a predetermined tension to the electrolyte and holding it with a reinforcing frame in which a through hole is formed,
Overlaying a plurality of the joined bodies and inserting a fastening member into the through hole,
A method of manufacturing a fuel cell, wherein a pressing force is applied to the joined body by fastening the fastening member.   9. The method of manufacturing a fuel cell according to claim 8, wherein the relative positional relationship between the plurality of joined bodies is adjusted after the fastening member is inserted into the through hole.   9. The method of manufacturing a fuel cell according to claim 8, wherein after the fastening member is fastened, an outer peripheral portion of the reinforcing frame is cut off. 9. The method of manufacturing a fuel cell according to claim 8, wherein the reinforcing frame is removed after the fastening member is fastened.