JP2018160327A - Method for manufacturing fuel battery cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress clogging of a flow path in a method of manufacturing a fuel cell including a heating step. A method of manufacturing a fuel cell includes a preparatory step of preparing a frame-shaped resin frame in which a membrane electrode gas diffusion layer assembly is fitted, a sandwiching step of sandwiching the resin frame with a pair of separators, and a resin frame. In a state of being sandwiched and sandwiched by a pair of separators, a heating step of heating and pressing the pair of separators to integrate the resin frame and the pair of separators, and the resin frame and the pair of separators are laminated. In the sandwiching step, the first flow path and the membrane electrode are formed at the boundary between each of the pair of separators and the resin frame in the sandwiching step. A second flow path for flowing a fluid is formed between the gas diffusion layer assembly and the heating step. In the heating step, the position corresponding to the region where the second flow path is formed in the pair of separators in the stacked state is determined. Do not heat press. [Selection diagram] Figure 1

Description

  The present invention relates to a method for manufacturing a fuel cell.

  A fuel cell includes a membrane electrode gas diffusion layer assembly in which a gas diffusion layer is disposed on both sides of a membrane electrode assembly having an electrolyte membrane, and a frame-shaped resin disposed around the membrane electrode gas diffusion layer assembly. Some include a frame and a pair of separators that sandwich the membrane electrode gas diffusion layer assembly and the resin frame (Patent Document 1). Such a fuel battery cell is connected to the first flow path formed along the stacking direction of the resin frame and the separator, the first flow path, and the first flow path and the membrane electrode gas diffusion layer joint A second flow path for flowing fluid between the body and the body. In the first flow path and the second flow path, a reaction gas used for power generation of the fuel battery cell, an off gas not used for power generation of the fuel battery cell, and a fluid such as a cooling medium circulate.

Japanese Patent Laying-Open No. 2015-133269

  As a method for manufacturing a fuel cell, there is a method including a heating step of heating and pressing a separator in a state where a resin frame bonded to a membrane electrode gas diffusion layer assembly is sandwiched and stacked between a pair of separators. However, in such a method, the resin flow path forming the second flow path may be softened by receiving a heat press, whereby the second flow path may be blocked. In order to solve such a problem, in a method for manufacturing a fuel cell including a heating step, a technique capable of suppressing the second flow path from being blocked has been desired.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms.

  (1) According to one form of this invention, the manufacturing method of a fuel cell is provided. This fuel cell manufacturing method includes a membrane electrode assembly having an electrolyte membrane, and a gas electrode in which a membrane electrode gas diffusion layer assembly having a gas diffusion layer laminated on both surfaces of the membrane electrode assembly is fitted. A preparatory step of preparing a shaped resin frame, a sandwiching step of sandwiching the membrane electrode gas diffusion layer assembly and the resin frame between a pair of separators, and the membrane electrode gas diffusion layer assembly and the resin frame of the pair of separators A step of heating and pressing the pair of separators to integrate the resin frame and the pair of separators, and the resin frame and the pair of separators, In the stacked state, each has a through hole forming a first flow path along the stacking direction, and in the clamping step, a boundary between each of the pair of separators and the resin frame Forming a second flow path for flowing a fluid between the first flow path and the membrane electrode gas diffusion layer assembly, and the heating step is performed when the pair of separators is heated and pressed. The position corresponding to the region where the second flow path is formed in the pair of separators in the formed state is not heated and pressed. In such a form, the position corresponding to the region where the second flow path is formed in the separator is not heated and pressed during the heating step, so the resin frame forming the second flow path is softened. Can be suppressed. For this reason, it can suppress that a 2nd flow path is obstruct | occluded.

  The form of the present invention is not limited to the method of manufacturing a fuel cell, and may be applied to various forms such as a fuel cell, a fuel cell system including the fuel cell, and a vehicle equipped with the fuel cell system. Is also possible. Further, the present invention is not limited to the above-described embodiments, and it is needless to say that the present invention can be implemented in various forms without departing from the spirit of the present invention.

It is explanatory drawing of the fuel cell manufactured with the manufacturing method of 1st Embodiment. It is a flowchart which shows the manufacturing method of a fuel cell. It is sectional drawing of the flow-path formation part seen from the arrow III-III shown in FIG. It is the figure which showed the flow-path formation part in a heating process among the manufacturing methods of a comparative example. It is explanatory drawing which showed the state by which the fuel battery cell manufactured with the manufacturing method of the comparative example was laminated | stacked with the gasket. It is explanatory drawing which showed the state by which the fuel cell manufactured with the manufacturing method of 1st Embodiment was laminated | stacked with the gasket.

A. First embodiment:
A1. Device configuration:
FIG. 1 is an explanatory view showing the fuel cell 100 manufactured by the method for manufacturing a fuel cell according to the first embodiment in an exploded manner. FIG. 1 shows XYZ axes orthogonal to each other. The X axis is a coordinate axis along the stacking direction of each component (a MEGA plate 200, a first separator 300, and a second separator 400, which will be described later) constituting the fuel cell 100. The Z axis is a coordinate axis along the horizontal direction. The XYZ axes in FIG. 1 correspond to the XYZ axes in the other drawings. In the XYZ axes, the direction indicated by the arrow is the + side, and the direction opposite to the direction indicated by the arrow is the − side.

  The fuel cell 100 is a polymer electrolyte fuel cell that generates electric power by an electrochemical reaction using a reaction gas. The reaction gas used by the fuel cell 100 is hydrogen and oxygen. A fuel cell stack in which a plurality of fuel cells 100 are stacked is mounted on a fuel cell vehicle as a power source, for example. The fuel cell 100 includes a MEGA plate 200, a first separator 300, and a second separator 400.

  The MEGA plate 200 is a plate-like member composed of a membrane electrode gas diffusion layer assembly (hereinafter referred to as “MEGA” (Membrane-Electrode Gas-diffusion-layer Assembly)) 210 and a resin frame 220. The MEGA 210 is a thin plate-like assembly in which gas diffusion layers are arranged on both surfaces of a membrane electrode assembly having an electrolyte membrane. The resin frame 220 is a rectangular frame member in which the MEGA 210 can be fitted in the center portion. The resin frame 220 is arranged around the MEGA 210 by fitting the MEGA 210 in the central portion. The resin frame 220 is made of a single type of thermoplastic resin. The single type of thermoplastic resin is, for example, PEN (polyethylene naphthalate), PET (polyethylene terephthalate), SPS (syndiotactic polystyrene), PP (polypropylene), PS (polystyrene), PPS (polyphenylene sulfide), COC (cyclic olefin copolymer) and the like.

  The MEGA 210 has a first surface 210a and a second surface 210c. The first surface 210a corresponds to the + side end surface of the anode electrode in the X-axis direction. The second surface 210c corresponds to the negative side end surface of the cathode electrode in the X-axis direction.

  The resin frame 220 has a first surface 220a and a second surface 220c. The first surface 220a is a surface on the side to which the first surface 210a faces in a state where the MEGA 210 is fitted in the resin frame 220. The second surface 220c is a surface on the side to which the second surface 210c faces in a state where the MEGA 210 is fitted to the resin frame 220.

  The fuel cell 100 has a configuration in which the MEGA plate 200 is sandwiched between the first separator 300 and the second separator 400 from both sides in the X-axis direction. In the present embodiment, the first separator 300 corresponds to an anode side separator, and the second separator 400 corresponds to a cathode side separator.

  The first separator 300 is a plate-like member disposed at a position facing the first surface 220a. Regarding the first separator 300, the surface on the + side in the X-axis direction and the surface on the − side in the X-axis direction have the same configuration. A groove-like anode gas flow path 310 extending along a direction parallel to the Z axis is formed in the central portion of the surface 300a of the first separator 300 facing the negative side in the X axis direction. A groove extending along a direction parallel to the Z axis is formed in a central portion of the cooling surface 300c (a position on the back side of the anode gas flow channel 310) which is a surface facing the + side in the X axis direction of the first separator 300. A cooling medium flow path 320 is formed.

  The second separator 400 is a plate-like member disposed at a position facing the second surface 220c. The second separator 400 has the same configuration as the first separator 300. A groove-like cathode gas flow path 410 extending along a direction parallel to the Z axis is formed in the central portion of the surface 400c of the second separator 400 facing the + side in the X axis direction.

  Gas manifold holes 502, 504, 512, and 514 and cooling medium manifold holes 522 and 524 are formed on the respective end sides in the Z-axis direction of the MEGA plate 200, the first separator 300, and the second separator 400. .

  In each of the MEGA plate 200, the first separator 300, and the second separator 400, the gas manifold hole 502 and the cooling medium manifold are arranged in order from the positive side to the negative side in the Y-axis direction on the negative side in the Z-axis direction. A hole 522 and a gas manifold hole 512 are formed.

  In the MEGA plate 200, the first separator 300, and the second separator 400, the gas manifold hole 514 and the cooling medium manifold hole are arranged in order from the + side in the Y-axis direction to the − side on the + side in the Z-axis direction. 524 and a gas manifold hole 504 are formed.

  The gas manifold holes 502, 504, 512, and 514 and the cooling medium manifold holes 522 and 524 are in a state where the MEGA plate 200 is sandwiched and stacked between the first separator 300 and the second separator 400 (hereinafter referred to as a stacked state). The flow path along the X-axis direction is formed. Here, the flow path along the X-axis direction corresponds to a subordinate concept of the first flow path in the claims.

  The gas manifold hole 502 constitutes an anode gas supply manifold through which the anode gas supplied to the fuel battery cell 100 flows. The gas manifold hole 504 constitutes an anode gas discharge manifold that discharges anode off gas made of anode gas or the like that has not been used for power generation of the fuel cell 100 to the outside of the fuel cell 100.

  The gas manifold hole 512 constitutes a cathode gas supply manifold through which the cathode gas supplied to the fuel cell 100 flows. The gas manifold hole 514 constitutes a cathode gas discharge manifold that discharges a cathode off gas made of cathode gas or the like that has not been used for power generation of the fuel battery cell 100 to the outside of the fuel battery cell 100.

  The cooling medium manifold hole 524 constitutes a cooling medium supply manifold through which the cooling medium supplied to the fuel battery cell 100 flows. The cooling medium manifold hole 522 constitutes a cooling medium discharge manifold that collects the cooling medium discharged from the fuel cell 100 and discharges it to the outside of the fuel cell 100.

  The first surface 220a of the resin frame 220 has a flow path forming part 503S and a flow path forming part 503D. The flow path forming portion 503 </ b> S is a groove-like portion that connects between the position where the MEGA 210 is disposed in the resin frame 220 and the gas manifold hole 502. In the present embodiment, the flow path forming unit 503S is four grooves. In FIG. 1, the flow path forming portion 503S is hatched. The flow path forming unit 503 </ b> S forms a flow path for flowing the anode gas between the first surface 210 a of the MEGA 210 and the gas manifold hole 502 together with the first separator 300 in the stacked state. This flow path is formed at the boundary between the flow path forming portion 503S and the first separator 300. The flow path forming portion 503D has the same shape and dimensions as the flow path forming portion 503S, and is a groove-like portion that connects between the position where the MEGA 210 is disposed in the resin frame 220 and the gas manifold hole 504. . The flow path forming unit 503 </ b> D forms a flow path for flowing the anode off gas between the first surface 210 a of the MEGA 210 and the gas manifold hole 504 in the stacked state together with the first separator 300. This flow path is formed at the boundary between the flow path forming portion 503D and the first separator 300.

  The second surface 220c of the resin frame 220 has a flow path forming part 513S and a flow path forming part 513D. The flow path forming portion 513S has the same shape and dimensions as the flow path forming portion 503S, and is a groove-like portion that connects between the position where the MEGA 210 is disposed in the resin frame 220 and the gas manifold hole 512. . The flow path forming unit 513 </ b> S forms a flow path for the cathode gas to flow between the second surface 220 c of the MEGA 210 and the gas manifold hole 512 together with the second separator 400 in the stacked state. This flow path is formed at the boundary between the flow path forming portion 513S and the second separator 400. The flow path forming portion 513D has the same shape and dimensions as the flow path forming portion 503S, and is a groove-shaped portion that connects between the position where the MEGA 210 is disposed in the resin frame 220 and the gas manifold hole 514. . The flow path forming unit 513D forms a flow path through which the cathode off gas flows between the second surface 220c of the MEGA 210 and the gas manifold hole 514 together with the second separator 400 in the stacked state. This flow path is formed at the boundary between the flow path forming portion 513D and the second separator 400. A flow path formed at the boundary between the flow path forming portion 503S (flow path forming portion 503D) and the first separator 300 and a boundary between the flow path forming portion 513S (flow path forming portion 513D) and the second separator 400 are formed. The flow path corresponds to a subordinate concept of the second flow path in the claims.

  A first melt-bonding portion 230 is formed on the surface of the first surface 220 a of the resin frame 220. The first melt bonding unit 230 bonds the resin frame 220 and the first separator 300 when the first separator 300 and the second separator 400 are hot-pressed in the stacked state.

  The first melt-bonding portion 230 is disposed so as to surround the gas manifold holes 512 and 514, thereby blocking the flow of fluid between the first surface 210a and the gas manifold holes 512 and 514 in the stacked state. To do. In addition, the first melt-bonding portion 230 is disposed so as to surround the periphery of the cooling medium manifold holes 522 and 524, so that the fluid between the first surface 210a and the cooling medium manifold holes 522 and 524 in the stacked state. Block the distribution of Further, the first melt-bonding portion 230 is disposed so as to surround a region including the gas manifold holes 502 and 504 and the central portion of the resin frame 220 where the MEGA 210 is disposed, so that the gas manifold in the stacked state. A flow path region is formed through which the anode gas flows from the hole 502 to the gas manifold hole 504 through the first surface 220a.

  The second surface 220 c of the resin frame 220 has a second fusion bonding part 240. The second fusion bonding portion 240 is formed on the surface of the second surface 220c. The second melt bonded portion 240 has the same shape and size as the shape obtained by inverting the first melt bonded portion 230 left and right when the MEGA plate 200 is viewed from the + side in the X-axis direction. The second fusion bonding portion 240 bonds the resin frame 220 and the second separator 400 when the first separator 300 and the second separator 400 are heated and pressed in the stacked state.

  The second fusion bonding portion 240 is disposed so as to surround the gas manifold holes 502 and 504 and to surround the cooling medium manifold holes 522 and 524. Further, the second melt-bonding portion 240 is disposed so as to surround a region including the gas manifold holes 512 and 514 and the central portion of the resin frame 220 where the MEGA 210 is disposed, so that in the stacked state, the gas manifold A flow path region is formed through which the cathode gas flows from the hole 512 to the gas manifold hole 514 through the second surface 220c.

A2. Manufacturing method of fuel cell:
FIG. 2 is a flowchart showing a method for manufacturing the fuel cell 100. First, the manufacturer of the fuel cell 100 performs a preparation process for preparing the resin frame 220 in which the MEGA 210 is fitted (process P110). The resin frame 220 is disposed around the MEGA 210 by fitting the MEGA 210 into the central portion of the resin frame 220. Through the preparation process (process P110), the MEGA 210 and the resin frame 220 are combined to form the MEGA plate 200.

  After the preparation process (process P110), the manufacturer of the fuel cell 100 performs a clamping process of sandwiching the MEGA plate 200 between the first separator 300 and the second separator 400 (process P120).

  After the sandwiching process (process P120), the manufacturer of the fuel battery cell 100 sandwiches the stacked MEGA plate 200, the first separator 300, and the second separator 400 from the outside of the first separator 300 and the second separator 400. A heating process is performed by heating and integrating the MEGA plate 200, the first separator 300, and the second separator 400 (process P130). The fuel cell 100 is completed through the heating process (process P130).

  FIG. 3 is a cross-sectional view showing a cross section taken along line III-III shown in FIG. FIG. 3 shows a cross section of the flow path forming unit 503S and the periphery thereof in the heating process (process P130). FIG. 3 also shows a pressing jig 630 and a pressing jig 640 used in the heating process (process P130). The pressing jig 630 is a jig that heat-presses the first separator 300 from the + side in the X-axis direction. The pressing jig 640 is a jig that heat-presses the second separator 400 from the negative side in the X-axis direction.

  The flow path forming unit 503 </ b> S forms the flow path F together with the first separator 300. The flow path F is a flow path for flowing an anode gas between the first surface 210a of the MEGA 210 and the gas manifold hole 502 (see FIG. 1).

  The pressing jig 630 is designed so that the position corresponding to the region R1 where the flow path F is formed in the first separator 300 in the stacked state is not heated and pressed. Specifically, the pressing jig 630 does not contact the region R1 in the first separator 300 in the stacked state, and contacts the region R2 adjacent to the region R1 on the + side and the − side in the Y-axis direction. Designed to shape. More specifically, the surface of the pressing jig 630 that faces the region R1 with respect to the surface that contacts the region R2 is formed to be recessed toward the + side in the X-axis direction. The pressing jig 640 has the same shape and dimensions as the shape of the pressing jig 630 that is turned upside down when viewed in the direction toward the paper surface in FIG. Thus, by designing the pressing jig 630 and the pressing jig 640, in the heating process (process P130), the position corresponding to the region R2 in the first separator 300 is along the X-axis direction. It is hot pressed to compress, while the position corresponding to region R1 is not hot pressed. At a position corresponding to the region R2, the MEGA plate 200 is compressed by heat pressing, and the MEGA plate 200 and the first separator 300 are softened and welded. On the other hand, at the position corresponding to the region R1, the MEGA plate 200 is not softened because it is not heated and pressed, and the shape shown in FIG. 3 is substantially maintained. For this reason, in the resin frame 220 after the heating step (step P130), the length in the X-axis direction of the portion P located between the flow path forming portions 503S is longer than the length in the X-axis direction of the region R2. .

  In the above description, the flow channel forming unit 503S has been described, but the same applies to the flow channel forming units 503D, 513S, and 513D, which are other flow channel forming units. That is, the flow path forming portions 503D, 513S, and 513D are also subjected to the heating process (process P130) using the pressing jig having the same shape as the pressing jig 630 and the pressing jig 640. , It can suppress that each flow path is obstruct | occluded.

B. Comparative example:
FIG. 4 is a cross-sectional view showing a cross section of the flow path forming portion 503S and its periphery in the heating step in the method for manufacturing the fuel cell of the comparative example. In the manufacturing method of the fuel cell 100 of the comparative example, a pressing jig 630a and a pressing jig 640a different from the pressing jig 630 and the pressing jig 640 are used in the heating process. Since the configuration of the fuel cell manufactured by the fuel cell manufacturing method of the comparative example is the same as the configuration of the first embodiment, the same configuration is denoted by the same reference numeral, and detailed description thereof is omitted. To do.

  The pressing jig 630a is a jig that heat-presses the first separator 300 in contact with the entire surface of the first separator 300 from the + side in the X-axis direction. The pressing jig 640a is a jig that heat-presses the second separator 400 in contact with the entire surface of the second separator 400 from the negative side in the X-axis direction.

  In the heating process of the comparative example, the entire surface of the first separator 300 and the entire surface of the second separator 400 are heated and pressed by the pressing jig 630a and the pressing jig 640a. For this reason, the flow path forming part 503 </ b> S (a part of the resin frame 220) forming the flow path F is subjected to the heating press via the first separator 300 and the second separator 400. Of the flow path forming portion 503S that has been softened by the heat press, the resin is directed toward the flow path F from the portion in contact with the first separator 300 (the end surface portion on the + side in the X-axis direction of the flow path forming portion 503S). By elution, the volume in the flow path F decreases. In some cases, the flow path F is closed. Further, the portion of the first separator 300 forming a part of the flow path F is in contact with the first separator 300 in the flow path forming portion 503S (the + of the flow path forming portion 503S in the X-axis direction). The dimension in the X-axis direction of the resin frame 220 is reduced by being pushed by the pressing jig 630a by the amount of the resin eluted from the end surface portion on the side.

  FIG. 5 is an explanatory view showing a state where fuel cells manufactured by the manufacturing method of the comparative example are stacked with the gasket 700. The fuel cells are alternately stacked with the gasket 700 to form a fuel cell stack. The gasket 700 in FIG. 5 is between the first separator 300 shown in FIG. 5 and the second separator 400 of an adjacent fuel cell (not shown) located on the + side in the X-axis direction with respect to the first separator 300. It is sandwiched. The gasket 700 seals the cooling medium flowing between the fuel cells by sealing between the fuel cells. In the fuel cell manufactured by the manufacturing method of the comparative example, since the volume of the flow path F is decreased, the transport efficiency of the anode gas is decreased.

  FIG. 6 is an explanatory view showing a state in which the fuel cell 100 manufactured by the manufacturing method of the first embodiment is laminated with the gasket 700. In the fuel cell 100 manufactured by the manufacturing method of the first embodiment, the blockage of the flow path F is suppressed.

  According to the embodiment described above, the position corresponding to the region R1 is not heated and pressed during the heating process (process P130), and thus the flow path forming portion 503S (part of the resin frame 220) forming the flow path F ) Can be suppressed. For this reason, it can suppress that the flow path F is obstruct | occluded.

  Even when the airtightness between the flow paths F is not ensured because the position corresponding to the region R1 is not heated and pressed, the anode gas is supplied from the gas manifold hole 502 to the gas manifold hole 504 through the first surface 220a. Since the airtightness in the flow channel region to be flowed is ensured, the method for manufacturing the fuel cell 100 in the present embodiment can achieve both the airtightness in the flow channel region in which the anode gas flows and the suppression of the blockage in the flow channel F.

  In the fuel cell stack in which the fuel cell 100 and the gasket 700 manufactured by the manufacturing method of the first embodiment are alternately stacked, when the fuel cell 100 and the gasket 700 are stacked, a part of the flow path F is formed. Since the portion of the first separator 300 that is formed can be bent to the negative side in the X-axis direction, which is the side where the flow path F is formed, overcompression on the gasket 700 is suppressed.

C. Variation:
C1. Modification 1:
In 1st Embodiment, although the resin frame 220 was comprised with the single kind of thermoplastic resin, this invention is not limited to this. For example, the resin frame 220 may be composed of two or more types of thermoplastic resins. As the resin frame 220 composed of two types of thermoplastic resins, the inside of the resin frame 220 is composed of a thermoplastic resin having a relatively high melting point, and an outer portion that contacts the first separator 300 and the second separator 400. Can be formed of a thermoplastic resin having a relatively low melting point. In such a form, since the inside of the resin frame 220 is difficult to be softened by the heating press, a decrease in the volume in the flow path F can be prevented. In addition, a configuration in which the region R2 of the resin frame 220 is made of a thermoplastic resin having a relatively low melting point and the region R1 is made of a thermoplastic resin having a relatively high melting point is also conceivable. Even in such a configuration, since the inside of the resin frame 220 is difficult to be softened by the heating press, a decrease in the volume in the flow path F can be prevented.

C2. Modification 2:
In the first embodiment, the resin frame 220 has a flow path forming portion 503S (flow path forming portion 503D, flow path forming portion 513S, and flow path forming portion 513D), and the first separator 300 and the second separator 400 are flow paths. Although it did not have a formation part, the present invention is not limited to this. For example, the resin frame 220 may not have a flow path forming part, and both the first separator 300 and the second separator 400 may have a flow path forming part. Moreover, the resin frame 220, the 1st separator 300, and the 2nd separator 400 may each have a flow-path formation part. That is, in the stacked state, the resin frame 220, the first separator 300, and the second separator 400 that form a flow path at the boundary between each other may be applied to the fuel cell manufacturing method of the present invention.

  The present invention is not limited to the above-described embodiments, examples, and modifications, and can be realized with various configurations without departing from the spirit thereof. For example, the technical features in the embodiments, examples, and modifications corresponding to the technical features in each embodiment described in the summary section of the invention are to solve some or all of the above-described problems, or In order to achieve part or all of the above-described effects, replacement or combination can be performed as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 100 ... Fuel cell 200 ... MEGA plate 210a ... 1st surface 210c ... 2nd surface 220 ... Resin frame 220a ... 1st surface 220c ... 2nd surface 230 ... 1st melt-adhesion part 240 ... 2nd melt-adhesion part 300 ... 1st 1 separator 300a ... surface 300c ... cooling surface 310 ... anode gas flow path 320 ... cooling medium flow path 400 ... second separator 400c ... surface 410 ... cathode gas flow path 502 ... gas manifold hole 503D ... flow path forming portion 503S ... flow path Forming part 504 ... Gas manifold hole 512 ... Gas manifold hole 513D ... Flow path forming part 513S ... Channel forming part 514 ... Gas manifold hole 522 ... Cooling medium manifold hole 524 ... Cooling medium manifold hole 630 ... Press jig 630a ... Press Jig 640 ... Pressing jig 640a ... Pressing jig 700 ... Gasket D ... Recessed part F ... Flow path P ... Part R1 ... Region R2 ... Region

Claims (1)

A method for producing a fuel cell, comprising:
A preparation step of preparing a frame-shaped resin frame in which a membrane electrode gas diffusion layer assembly having a membrane electrode assembly having an electrolyte membrane and a gas diffusion layer laminated on both surfaces of the membrane electrode assembly is fitted When,
A sandwiching step of sandwiching the membrane electrode gas diffusion layer assembly and the resin frame with a pair of separators;
In the state in which the membrane electrode gas diffusion layer assembly and the resin frame are sandwiched and stacked between the pair of separators, the pair of separators is hot-pressed so that the resin frame and the pair of separators are integrated. A heating process,
The resin frame and the pair of separators each have a through hole that forms a first flow path along the stacking direction in the stacked state,
In the sandwiching step, a second flow path for flowing a fluid between the first flow path and the membrane electrode gas diffusion layer assembly is formed at the boundary between each of the pair of separators and the resin frame. And
In the heating step, when the pair of separators is heated and pressed, a position corresponding to a region where the second flow path is formed in the pair of separators in the stacked state is not heated and pressed. Manufacturing method.

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