Fuel cell manufacturing apparatus and fuel cell manufacturing method

Abstract

The invention relates to a fuel cell manufacturing apparatus and a fuel cell manufacturing method. The fuel cell manufacturing apparatus includes: a first press die; and a second press die that bonds the membrane electrode assembly and the separator via the adhesive by pressing a laminate including the membrane electrode assembly, the adhesive, and the separator of the fuel cell together with the first press die. At least one of the first press die and the second press die has a first portion that pressurizes a peripheral edge portion of a power generation region in the fuel cell, and a second portion that pressurizes a peripheral edge portion of a manifold in the fuel cell.

Description

Technical Field

[0001] This disclosure relates to an apparatus for manufacturing fuel cells and a method for manufacturing fuel cells. Background Technology

[0002] There is a known method for manufacturing fuel cells using a heated stamping device (e.g., Japanese Patent Application Publication No. 2020-013753).

[0003] Previously, stamping dies specifically designed for fuel cells were used in the stamping process. Therefore, when manufacturing multiple types of fuel cells on a single production line, the need to change stamping dies made it impossible to manufacture multiple types of fuel cells efficiently. Summary of the Invention

[0004] This disclosure can be implemented in the following ways.

[0005] According to the first aspect of this disclosure, an apparatus for manufacturing a fuel cell is provided.

[0006] The fuel cell manufacturing apparatus includes:

[0007] First stamping die; and

[0008] The second stamping die, together with the first stamping die, clamps the laminate of the fuel cell including the membrane electrode assembly, adhesive and separator, and applies pressure to join the membrane electrode assembly to the separator by means of the adhesive.

[0009] At least one of the first stamping die and the second stamping die has a first part for pressurizing the periphery of the power generation area in the fuel cell and a second part for pressurizing the periphery of the manifold in the fuel cell.

[0010] According to this fuel cell manufacturing apparatus, the first and second stamping dies can be used to pressurize the areas where adhesive is present, which are common to multiple types of fuel cells. Therefore, the frequency of changing the first and second stamping dies can be reduced, enabling the efficient manufacturing of multiple types of fuel cells.

[0011] In the fuel cell manufacturing apparatus described above,

[0012] The thickness of the first part and the second part mentioned above may be greater than the thickness of the part of the laminate containing the power generation region mentioned above.

[0013] The fuel cell manufacturing apparatus according to this method can suppress damage to the power generation area caused by pressurization because it is not necessary to pressurize the power generation area.

[0014] In the fuel cell manufacturing apparatus described above,

[0015] At least one of the first stamping die and the second stamping die may have a third portion that overlaps with the power generation area, and is configured to be able to change the thickness of the third portion.

[0016] According to this fuel cell manufacturing apparatus, the third part can pressurize locations where pressurization by the first and second parts is impossible. Therefore, the number of locations where insufficient pressurization occurs can be reduced.

[0017] In the fuel cell manufacturing apparatus described above,

[0018] The first stamping die and the second stamping die can be used for pre-assembly of the membrane electrode assembly and the diaphragm.

[0019] The fuel cell manufacturing apparatus based on this method can efficiently perform pre-assembly.

[0020] According to the second aspect of this disclosure, a method for manufacturing a fuel cell is provided.

[0021] The method for manufacturing this fuel cell includes:

[0022] The process of preparing the aforementioned fuel cell, including the laminate of membrane electrode assembly, adhesive, and separator; and

[0023] The process of bonding the membrane electrode assembly to the diaphragm by means of the adhesive, which involves pressing the laminated body between the first and second stamping dies and applying pressure.

[0024] At least one of the first stamping die and the second stamping die has a first part for pressurizing the periphery of the power generation area in the fuel cell and a second part for pressurizing the periphery of the manifold in the fuel cell.

[0025] According to this fuel cell manufacturing method, the first and second stamping dies can be used to pressurize the areas where binders are present in a common manner across multiple types of fuel cells. Therefore, the frequency of changing the first and second stamping dies can be reduced, enabling the efficient manufacture of multiple types of fuel cells.

[0026] This disclosure can also be implemented in various ways other than fuel cell manufacturing apparatus and fuel cell manufacturing method. For example, it can be implemented in the form of stamping apparatus, stamping method, etc. Attached Figure Description

[0027] Hereinafter, the features, advantages, technical and industrial importance of exemplary embodiments of the present invention will be described with reference to the accompanying drawings, in which the same reference numerals denote the same constituent elements, wherein:

[0028] Figure 1 This is an explanatory diagram showing the structure of a fuel cell.

[0029] Figure 2 yes Figure 1 Sectional view along line II-II.

[0030] Figure 3 This is an explanatory diagram showing the structure of the stamping device.

[0031] Figure 4 This is a top view of a stamping die.

[0032] Figure 5 This is an explanatory diagram illustrating the manufacturing method of a fuel cell.

[0033] Figure 6 This is a top view of a stamping die according to other embodiments. Detailed Implementation

[0034] Figure 1 This is an explanatory diagram showing the configuration of a fuel cell 10 in one embodiment of the present disclosure. Figure 2 yes Figure 1 The image shows a cross-sectional view along line II-II. In this embodiment, the fuel cell 10 is a solid polymer fuel cell. However, the fuel cell 10 may also be a fuel cell other than a solid polymer fuel cell. Sometimes a single fuel cell 10 is referred to as a single cell, and sometimes a stack of multiple single cells is referred to as a fuel cell stack. In this disclosure, unless otherwise specified, the term fuel cell refers to a single cell.

[0035] like Figure 1 As shown, the fuel cell 10 includes a membrane electrode assembly 20, a resin sheet 30, and two diaphragms 40A and 40B. The fuel cell 10 generates electricity through an electrochemical reaction between air supplied as cathode gas and hydrogen supplied as anode gas. In this embodiment, the fuel cell 10 is rectangular in plan view. Manifolds 11-13 and 16-18 for supplying anode gas, cathode gas, and cooling water are provided at both ends along the length LD of the fuel cell 10. The membrane electrode assembly 20 is rectangular in plan view. The resin sheet 30 is a rectangular frame in plan view and is configured to surround the outer periphery of the membrane electrode assembly 20. The inner periphery of the resin sheet 30 is joined to the outer periphery of the membrane electrode assembly 20. The two diaphragms 40A and 40B are configured to sandwich the membrane electrode assembly 20 and the resin sheet 30. Each diaphragm 40A and 40B is rectangular in plan view. Each diaphragm 40A and 40B is joined to the resin sheet 30. Through holes constituting manifolds 11-13 and 16-18 are provided in the resin sheet 30 and each diaphragm 40A and 40B.

[0036] like Figure 2 As shown, the membrane electrode assembly 20 includes an electrolyte membrane 21, electrode catalyst layers 22A and 22B disposed on both sides of the electrolyte membrane 21, and gas diffusion layers 23A and 23B disposed on each of the electrode catalyst layers 22A and 22B. However, the membrane electrode assembly 20 may also omit the gas diffusion layers 23A and 23B. The electrode catalyst layer 22A is the cathode electrode, and the electrode catalyst layer 22B is the anode electrode. The electrolyte membrane 21 is, for example, made of a fluororesin-based ion exchange membrane. The electrode catalyst layers 22A and 22B are, for example, made of a carbon support carrying a platinum catalyst. The gas diffusion layers 23A and 23B are, for example, made of carbon paper.

[0037] The inner periphery of the resin sheet 30 is bonded to the outer periphery of the membrane electrode assembly 20, for example, using a photocurable adhesive. The resin sheet 30 includes a core layer 31 and adhesive layers 32A and 32B disposed on both sides of the core layer 31. The core layer 31 is, for example, made of polyethylene naphthalate (PEN). The adhesive layers 32A and 32B are, for example, made of a modified olefin-based hot-melt adhesive. Preferably, the melting point of the core layer 31 is higher than that of the adhesive layers 32A and 32B. Preferably, the tensile strength of the core layer 31 is higher than that of the adhesive layers 32A and 32B. Preferably, the hardness of the core layer 31 is higher than that of the adhesive layers 32A and 32B.

[0038] Diaphragms 40A and 40B are bonded to resin sheet 30 via adhesive layers 32A and 32B. Diaphragms 40A and 40B are made of, for example, titanium alloy. The diaphragms 40A and 40B are provided with irregularities, for example, by stamping. On the cathode side, the irregularities between diaphragm 40A and membrane electrode assembly 20 form a flow path for cathode gas flow, and on the anode side, the irregularities between diaphragm 40B and membrane electrode assembly 20 form a flow path for anode gas flow.

[0039] Figure 3 This is an explanatory diagram showing the structure of the stamping apparatus 100 in this embodiment. The stamping apparatus 100 corresponds to the "fuel cell manufacturing apparatus" in this disclosure. The stamping apparatus 100 is used to join two diaphragms 40A, 40B to the membrane electrode assembly 20 via adhesive layers 32A, 32B of the resin sheet 30. The stamping apparatus 100 includes a fixed platen 110, a movable platen 120, a guide section 130, a drive section 140, a first stamping die 150A, a second stamping die 150B, a first heater 160A, a second heater 160B, and a control section 170.

[0040] The fixed disk 110 and the movable disk 120 are configured to face each other. In this embodiment, the movable disk 120 is disposed on top of the fixed disk 110. However, the movable disk 120 may also be disposed below the fixed disk 110. The movable disk 120 is configured to move up and down along the guide portion 130. The vertical position of the movable disk 120 is changed by the drive portion 140. The drive portion 140 is, for example, an actuator such as an electric cylinder or a hydraulic cylinder. Furthermore, the position of the fixed disk 110 may not be fixed, and the positions of both the fixed disk 110 and the movable disk 120 may be changed by the drive portion 140.

[0041] A first stamping die 150A is mounted on a movable plate 120, and a second stamping die 150B is mounted on a fixed plate 110. The first stamping die 150A and the second stamping die 150B are configured to face each other when the first stamping die 150A is mounted on the movable plate 120 and the second stamping die 150B is mounted on the fixed plate 110. In this embodiment, the first stamping die 150A is configured to allow for variation in the thickness of a portion of the first stamping die 150A, and the second stamping die 150B is configured to allow for variation in the thickness of a portion of the second stamping die 150B. However, either the first stamping die 150A or the second stamping die 150B may not be configured to allow for variation in thickness. The specific configurations of the first stamping die 150A and the second stamping die 150B will be described later. In the following description, unless otherwise specified, the first stamping die 150A and the second stamping die 150B are sometimes referred to simply as stamping die 150.

[0042] The first heater 160A is a heater for heating the first stamping die 150A, and is disposed on at least one of the movable plate 120 and the first stamping die 150A. The second heater 160B is a heater for heating the second stamping die 150B, and is disposed on at least one of the fixed plate 110 and the second stamping die 150B.

[0043] The control unit 170 controls the drive unit 140, the first heater 160A, and the second heater 160B. The control unit 170 is a computer equipped with a processor 171, a memory 172, an input / output interface 173, and an internal bus 174. The processor 171, memory 172, and input / output interface 173 are connected via the internal bus 174 for bidirectional communication. The drive unit 140, the first heater 160A, and the second heater 160B are connected to the input / output interface 173 via wired or wireless communication. The processor 171 executes a computer program PG pre-stored in the memory 172 to perform various functions, including changing the position of the movable disk 120 via the drive unit 140, heating the first stamping die 150A via the first heater 160A, and heating the second stamping die 150B via the second heater 160B.

[0044] Figure 4 This is an explanatory diagram showing the structure of the stamping die 150 in this embodiment. The stamping die 150 is used to manufacture various types of fuel cells 10a and 10b. In the following description, fuel cell 10a is referred to as the first type of fuel cell 10a, and fuel cell 10b, which is a different type from the first type of fuel cell 10a, is referred to as the second type of fuel cell 10b. In this embodiment, the length Lb of the second type of fuel cell 10b is the same as the length La of the first type of fuel cell 10a, but the width Wb of the second type of fuel cell 10b is narrower than the width Wa of the first type of fuel cell 10a. The constituent elements of the first type of fuel cell 10a and the second type of fuel cell 10b are similar to those of the first type of fuel cell 10a and the second type of fuel cell 10b. Figure 1 The fuel cell 10 shown has the same constituent elements.

[0045] The stamping die 150 has two first portions 151A and 151B, two second portions 152A and 152B, a third portion 153, and a fourth portion 154. The two first portions 151A and 151B are arranged with a gap between them. The two second portions 152A and 152B are arranged with a gap between them, sandwiching the two first portions 151A and 151B. The direction from one second portion 152A to the other second portion 152B is perpendicular to the direction from one first portion 151A to the other first portion 151B. The third portion 153 is disposed between the two first portions 151A and 151B and between the two second portions 152A and 152B. The fourth portion 154 is the portion other than the first portions 151A and 151B, the second portions 152A and 152B, and the third portion 153. The thickness t1 of parts 151A and 151B and the thickness t2 of parts 152A and 152B are greater than the thickness t0 of the portions of fuel cells 10a and 10b that have power generation regions. The power generation region is the region where the membrane electrode assembly 20 is disposed.

[0046] Part 3 153 is configured to have a variable thickness. In this embodiment, the thickness of part 3 153 is changed by loading and unloading the fitting onto the die body. In this embodiment, at least one of the fitting and the die body has a magnet, and the fitting is fixed to the die body by the magnetic force of the magnet. However, the fitting may also be fixed to the die body without a magnet, for example, by screws. When the diaphragms 40A and 40B are made of a material attracted by a magnet, it is preferable that the fitting is fixed to the die body by a mechanism other than a magnet. The loading and unloading of the fitting can be performed manually by an operator, but it is preferable to automate it by means of a robotic arm or the like.

[0047] In this embodiment, the fuel cell 10a and 10b sides of parts 151A and 151B, and the fuel cell 10a and 10b sides of parts 152A and 152B, are located on the same plane. The fuel cell 10a and 10b sides of parts 151A and 151B, and the fuel cell 10a and 10b sides of parts 152A and 152B, protrude further towards the fuel cell 10a and 10b sides than the fuel cell 10a and 10b sides of parts 153 (without mounting accessories) and parts 154 (without mounting accessories). The fuel cell 10a and 10b sides of parts 153 (without mounting accessories) and parts 154 (without mounting accessories) are located on the same plane. When the accessories are installed, the fuel cell 10a and 10b side surfaces of Part 3 153, the fuel cell 10a and 10b side surfaces of Part 1 151A and 151B, and the fuel cell 10a and 10b side surfaces of Part 2 152A and 152B are located on the same plane.

[0048] During the manufacture of the first type of fuel cell 10a, two first parts 151A and 151B contact the periphery of the power generation area of ​​the first type of fuel cell 10a, and two second parts 152A and 152B contact the periphery of the manifold of the first type of fuel cell 10a. The periphery of the power generation area refers to the portion surrounding the power generation area, in other words, the portion surrounding the membrane electrode assembly 20. The periphery of the manifold refers to the portion surrounding the manifolds 11-13 and 16-18. During the manufacture of the first type of fuel cell 10a, the component is removed from the stamping die body, and the third part 153 overlaps with the first type of fuel cell 10a in top view, but does not contact the first type of fuel cell 10a.

[0049] During the manufacture of the second type of fuel cell 10b, the first portion 151A of one party contacts the periphery of the power generation area of ​​the second type of fuel cell 10b, but the first portion 151B of the other party does not contact the second type of fuel cell 10b. During the manufacture of the second type of fuel cell 10b, a portion of each of the second portions 152A and 152B contacts the periphery of the manifold of the second type of fuel cell 10b, but the remaining portion of each of the second portions 152A and 152B does not contact the second type of fuel cell 10b. During the manufacture of the second type of fuel cell 10b, accessories are mounted on the stamping die body. The thickness of the third portion 153 during the manufacture of the second type of fuel cell 10b is greater than the thickness of the third portion 153 during the manufacture of the first type of fuel cell 10a, and the third portion 153 contacts the periphery of the power generation area of ​​the second type of fuel cell 10b.

[0050] Figure 5This is an explanatory diagram illustrating the manufacturing method of the fuel cell 10 in this embodiment. The manufacturing method of the fuel cell 10 includes a pre-assembly step, a heating step, a first cooling step, and a second cooling step. Before the pre-assembly step, a laminate containing a membrane electrode assembly 20 and a resin sheet 30 disposed between two membranes 40A and 40B is prepared as a workpiece WK. The membrane electrode assembly 20 and the resin sheet 30 are pre-joined. The fuel cell 10 is manufactured by sequentially performing the pre-assembly step, the heating step, the first cooling step, and the second cooling step on the workpiece WK. Between each step, the workpiece WK is transported, for example, by a tray or the like.

[0051] In the pre-assembly process, by using Figure 3 The stamping apparatus 100 shown uses heated stamping to pre-assemble diaphragms 40A and 40B onto the membrane electrode assembly 20 and resin sheet 30. Specifically, the workpiece WK is clamped by a first stamping die 150A and a second stamping die 150B. By applying pressure and heating to the workpiece WK, the diaphragms 40A and 40B are brought into close contact with the adhesive layers 32A and 32B of the resin sheet 30, and at least a portion of the adhesive layers 32A and 32B is melted. In this embodiment, the temperature of the first stamping die 150A and the second stamping die 150B in the pre-assembly process is higher than the melting point of the adhesive layers 32A and 32B. The melting point of the adhesive layers 32A and 32B is approximately 160 degrees Celsius, and the temperature of the first stamping die 150A and the second stamping die 150B in the pre-assembly process is maintained at approximately 200 degrees Celsius.

[0052] In the heating process, the temperature of adhesive layers 32A and 32B is raised above their melting points by heating the workpiece WK, thereby fully melting the adhesive layers 32A and 32B. The heating method for the workpiece WK in the heating process is not particularly limited; for example, the workpiece WK can be processed in a heating furnace, or it can be heated by irradiating the workpiece WK with electromagnetic waves such as microwaves. The heating process can be integrated with the pre-assembly process. That is, the heating process can be implemented using the stamping device 100.

[0053] In the first cooling process, the workpiece WK is cooled by cooling stamping to enhance the adhesive strength of the adhesive layers 32A and 32B. Specifically, to obtain the same adhesive strength of the adhesive layers 32A and 32B and the same thickness of the workpiece WK as the target, the workpiece WK is clamped in the stamping die for a specified time while maintaining the temperature of the stamping die for cooling stamping at approximately the crystallization temperature of the adhesive layers 32A and 32B. In this embodiment, the crystallization temperature of the adhesive layers 32A and 32B is approximately 100 degrees Celsius, and the temperature of the stamping die in the first cooling process is maintained at approximately 100 degrees Celsius. In the first cooling process, although the basic structure is similar to... Figure 3 The stamping device shown is the same as the stamping device 100, but has a cooling function instead of a heating function.

[0054] In the second cooling process, the workpiece WK is cooled to a temperature that is palpable by hand by using a cooling stamping process. Specifically, the workpiece WK is held in the stamping die for a specified time while maintaining the temperature of the cooling stamping die at, for example, approximately 50 degrees Celsius. In this second cooling process, although the basic structure is similar to... Figure 3 The stamping device shown is the same as the stamping device 100, but has a cooling function instead of a heating function.

[0055] According to the stamping apparatus 100 of this embodiment described above, the stamping die 150 can be used in both the manufacture of the first type of fuel cell 10a and the manufacture of the second type of fuel cell 10b without changing the stamping die 150. Specifically, the first part 151A of one party and the second parts 152A and 152B of both parties can be used to pressurize the positions where the adhesive layers 32A and 32B are commonly provided in both the first type of fuel cell 10a and the second type of fuel cell 10b. Here, in the prior art, since the stamping die used for stamping needs to be replaced by heating during the manufacture of the first type of fuel cell 10a and the second type of fuel cell 10b, time is spent cooling the stamping die, replacing the stamping die, and heating the stamping die. This results in the problem that the first type of fuel cell 10a and the second type of fuel cell 10b cannot be manufactured efficiently on a single production line. However, in this embodiment, since the stamping die 150 can be used in both the manufacture of the first type of fuel cell 10a and the manufacture of the second type of fuel cell 10b without changing the stamping die 150, the frequency of changing the stamping die 150 can be reduced, and the first type of fuel cell 10a and the second type of fuel cell 10b can be manufactured efficiently on one production line.

[0056] Furthermore, for locations where adhesive layers 32A and 32B are not provided in the second type of fuel cell 10b but are provided in the first type of fuel cell 10a, pressurization can be achieved using the first part 151B of the other party. Also, for locations where adhesive layers 32A and 32B are not provided in the first type of fuel cell 10a but are provided in the second type of fuel cell 10b, pressurization can be achieved using the third part 153, whose thickness can be changed by attaching and detaching the fittings. Therefore, inadequate pressurization of the adhesive layers 32A and 32B can be prevented during the manufacturing of both the first type of fuel cell 10a and the second type of fuel cell 10b.

[0057] B. Other implementation methods:

[0058] (B1) Figure 6 This is an explanatory diagram showing the structure of the stamping die 150 in another embodiment. In the above embodiment, the stamping die 150 is configured in a planar shape such that the second portions 152A and 152B cover the manifolds 11-13 and 16-18 of the fuel cell 10. Therefore, it is possible to heat a large area. In contrast, in other embodiments, it can be as follows... Figure 6 As shown, the stamping die 150 is configured in a frame or line shape such that the second parts 152A and 152B do not cover the manifolds 11-13 and 16-18. Furthermore, in the above embodiment, the first parts 151A and 151B are configured as lines, but in other embodiments, the first parts 151A and 151B may be configured as surfaces.

[0059] (B2) In the above embodiment, the fuel cell 10 has a rectangular planar shape. In contrast, in other embodiments, the planar shape of the fuel cell 10 is not limited to a rectangle; for example, it can be a polygon other than a rectangle, or it can be a circle, an oblong shape, etc. In this case, the planar shapes of the first portion 151A, 151B, the second portion 152A, 152B, and the third portion 153 of the stamping die 150 can be shapes corresponding to the planar shape of the fuel cell 10.

[0060] (B3) In the above embodiment, the third part 153 is configured to pressurize the periphery of the power generation region of the second type of fuel cell 10b. In contrast, in other embodiments, when the position of the manifold periphery differs between the first type of fuel cell 10a and the second type of fuel cell 10b, the third part 153 may be configured to pressurize the manifold periphery. For example, in the above embodiment, the manifold periphery is located at both ends of the length direction LD of the first type of fuel cell 10a and the second type of fuel cell 10b. In contrast, in other embodiments, the manifold periphery may be located at both ends of the short side direction SD of the first type of fuel cell 10a and the second type of fuel cell 10b. In this case, the third part 153 may be configured to pressurize the manifold periphery of the second type of fuel cell 10b instead of the power generation region periphery.

[0061] (B4) In the above embodiment, the stamping die 150 has a detachable accessory, configured to change the thickness of the third portion 153 by attaching or detaching the accessory. In contrast, in other embodiments, the stamping die 150 may have a retractable accessory, configured to change the thickness of the third portion 153 by inserting or removing the accessory. Specifically, the stamping die 150 is provided with a recess for retracting the accessory, which may be configured to move up and down via an actuator driven by the control unit 170. The control unit 170 may retract the accessory into the recess of the stamping die 150 during the manufacture of the first type of fuel cell 10a, and protrude the accessory from the recess of the stamping die 150 during the manufacture of the second type of fuel cell 10b. In this case, the thickness of the third portion 153 can also be quickly changed by attaching or detaching the accessory.

[0062] This disclosure is not limited to the embodiments described above, and can be implemented with various configurations without departing from its spirit. For example, the technical features in the embodiments corresponding to the technical features in the various methods described in the Summary of the Invention section can be appropriately replaced or combined to solve some or all of the above-mentioned problems, or to achieve some or all of the above-mentioned effects. In addition, any technical feature that is not described as essential in this specification can be appropriately deleted.

Claims

1. An apparatus for manufacturing a fuel cell, wherein, have: First stamping die; and The second stamping die, together with the first stamping die, clamps the laminate of the fuel cell, including the membrane electrode assembly, adhesive, and membrane, and applies pressure to join the membrane electrode assembly to the membrane using the adhesive. At least one of the first stamping die and the second stamping die has a first part for pressurizing the periphery of the power generation region in the fuel cell and a second part for pressurizing the periphery of the manifold in the fuel cell.

2. The fuel cell manufacturing apparatus according to claim 1, wherein, The thickness of the first part and the second part is greater than the thickness of the part of the laminate containing the power generation region.

3. The fuel cell manufacturing apparatus according to claim 2, wherein, At least one of the first stamping die and the second stamping die has a third portion that overlaps with the power generation area, configured to allow for variation in the thickness of the third portion.

4. The fuel cell manufacturing apparatus according to claim 1, wherein, The first stamping die and the second stamping die are used for pre-assembly of the membrane electrode assembly and the diaphragm.

5. A method for manufacturing a fuel cell, wherein, include: The process of preparing the fuel cell including a membrane electrode assembly, an adhesive, and a membrane laminate; and The process of bonding the membrane electrode assembly to the diaphragm by means of an adhesive, which involves pressing the laminated body between a first stamping die and a second stamping die and applying pressure. At least one of the first stamping die and the second stamping die has a first part for pressurizing the periphery of the power generation region in the fuel cell and a second part for pressurizing the periphery of the manifold in the fuel cell.

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