WO2021019974A1 - Fuel cell and method for manufacturing fuel cell - Google Patents

Fuel cell and method for manufacturing fuel cell Download PDF

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Publication number
WO2021019974A1
WO2021019974A1 PCT/JP2020/024777 JP2020024777W WO2021019974A1 WO 2021019974 A1 WO2021019974 A1 WO 2021019974A1 JP 2020024777 W JP2020024777 W JP 2020024777W WO 2021019974 A1 WO2021019974 A1 WO 2021019974A1
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WO
WIPO (PCT)
Prior art keywords
side separator
electrode composite
separator
fuel cell
membrane electrode
Prior art date
Application number
PCT/JP2020/024777
Other languages
French (fr)
Japanese (ja)
Inventor
泰輔 松田
元 由井
茂 渡部
Original Assignee
Nok株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nok株式会社 filed Critical Nok株式会社
Priority to JP2021536840A priority Critical patent/JP7181409B2/en
Publication of WO2021019974A1 publication Critical patent/WO2021019974A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/12—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0286—Processes for forming seals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a fuel cell and a method for manufacturing a fuel cell.
  • a fuel cell is composed of a membrane electrode assembly (MEA: Membrane Electrode Assembly), a pair of separators sandwiching the membrane electrode composite, and a pair of separators and a membrane electrode composite. It is provided with a sealing member, which is interposed between them.
  • the membrane electrode composite comprises an electrolyte membrane, a pair of catalyst electrode layers and a pair of gas diffusion layers.
  • the portion where the catalyst electrode layer and the gas diffusion layer are formed is referred to as a "main body portion”
  • the electrolyte membrane or film protruding outward from the main body portion is referred to as an "overhanging portion".
  • the sealing member is, for example, an elastic body, a gasket, or the like.
  • the main body of the membrane electrode composite is sandwiched between the reaction flow paths provided in the pair of separators to form a reaction region.
  • the overhanging portion of the film electrode composite is sandwiched between the sealing members provided on the pair of separators to form a sealing region.
  • the fuel cell stack is formed by stacking a plurality of fuel cell cells and compressing the fuel cell cells with a predetermined clearance or load. When the fuel cell is compressed, the membrane electrode composite is also compressed via the sealing member, but it is desirable that no wrinkles are generated in the overhanging portion between the sealing region and the reaction region.
  • FIG. 10A is a cross-sectional view of a main part showing the time when the conventional fuel cell is assembled.
  • FIG. 10B is a cross-sectional view of a main part showing the time of compression of FIG. 10A.
  • FIG. 11A is a cross-sectional view of a main part showing a time when another conventional fuel cell is assembled.
  • FIG. 11B is a cross-sectional view of a main part showing the time of compression of FIG. 11A.
  • the conventional fuel cell 100 includes a separator 101, a separator 102, and a membrane electrode composite 103.
  • the separator 101 arranged on the lower side includes a reaction flow path portion 106 through which the reaction fluid flows, and a convex bead 108 on which the seal member 104 is arranged.
  • the separator 102 arranged on the upper side includes a reaction flow path portion 107 through which the reaction fluid flows, and a convex bead 109 on which the seal member 105 is arranged.
  • the membrane electrode composite 103 When assembling the fuel cell 100, first, the membrane electrode composite 103 is placed on the lower separator 101. The main body 111 of the membrane electrode composite 103 is placed on the reaction flow path 106, and the overhang (electrolyte film or film) 112 is placed on the seal member 104. The overhanging portion 112 is a portion that overhangs the main body portion 111 to the outside. At this time, a deflection 120 is formed in the overhanging portion 112 between the sealing member 104 and the reaction flow path portion 106 due to its own weight.
  • another conventional fuel cell 200 includes a separator 201, a separator 202, and a membrane electrode composite 203.
  • the separator 201 arranged on the lower side includes a sealing member 204 and a reaction flow path portion 206 through which the reaction fluid flows.
  • the sealing member 204 is a lip gasket whose diameter decreases toward the tip.
  • the separator 202 arranged on the upper side includes a sealing member 205 and a reaction flow path portion 207 through which the reaction fluid flows.
  • the membrane electrode composite 203 is arranged on the separator 201.
  • the main body 211 of the membrane electrode composite 203 is arranged on the reaction flow path 206, and the overhang (electrolyte film or film) 212 is arranged on the seal member 204.
  • a deflection 220 is formed in the overhanging portion 212 between the sealing member 204 and the reaction flow path portion 206 due to its own weight.
  • the film electrode composites 103 and 203 have deflections 120 and 220 during assembly, and the deflections 120 and 220 cause wrinkles 120A and 220A during compression. Then it is inferred.
  • the overhanging portions 112 and 212 protruding to the outside of the membrane electrode composites 103 and 203 are made of a thin and soft material, bending and wrinkling are likely to occur. Further, when a lip gasket having a large height such as the sealing member 204 is used, the fact that the crushing allowance is set higher also causes the overhanging portions 112 and 212 to bend.
  • the present invention has been invented to solve such a problem, and is a method for manufacturing a fuel cell and a fuel cell, which can eliminate or reduce wrinkles of an electrolyte membrane or a film overhanging the outside of a membrane electrode composite.
  • the challenge is to provide.
  • the present invention for solving the above-mentioned problems includes a seal member arranged in a flatly formed arrangement portion, a one-side separator provided with a reaction flow path portion through which a reaction gas flows, and a seal member arranged in the arrangement portion. And a film electrode composite having a reaction flow path portion through which the reaction gas flows, and a film electrode composite arranged between the one side separator and the other side separator via the seal member, respectively.
  • the reaction region is formed by sandwiching the main body of the film electrode composite between the reaction flow paths, and the electrolyte membrane or film protruding from the main body is sandwiched between the sealing members.
  • the contact surface of the reaction flow path portion of the one-side separator to which the main body portion of the film electrode composite comes into contact is more than the arrangement surface of the arrangement portion of the one-side separator. It is characterized in that it is set on the side away from the film electrode composite.
  • a one-side separator provided with a seal member arranged in a flatly formed arrangement portion and a reaction flow path portion through which the reaction gas flows, and a seal member and the reaction gas arranged in the arrangement portion flow.
  • a preparatory step for preparing the other-side separator provided with the reaction flow path portion and the membrane electrode composite, and the membrane electrode composite is arranged on the one-side separator, and the main body portion of the membrane electrode composite is arranged. Is arranged on the reaction flow path portion of the one-side separator, and the electrolyte film or film projecting from the main body portion is arranged on the seal member of the one-side separator.
  • the other side separator is arranged on the film electrode composite, the main body portion of the membrane electrode composite is sandwiched between the reaction flow paths, and a reaction region is formed, and the electrolyte membrane is formed between the seal members.
  • the other-side separator arranging step of sandwiching the film to form a seal region and a compression step of applying a force in a direction in which the one-side separator and the other-side separator are brought close to each other are included.
  • the contact surface of the reaction flow path portion to which the main body portion of the film electrode composite abuts is set to be closer to the side away from the membrane electrode composite than the arrangement surface of the arrangement portion of the one-side separator. It is a feature.
  • the difference in height of the overhanging portion (electrolyte film or film) at the time of assembly can be reduced between the seal region and the reaction region.
  • the deflection of the overhanging portion can be eliminated or reduced during assembly, and the wrinkles of the overhanging portion of the membrane electrode composite can be eliminated or reduced even after compression.
  • the wrinkles of the electrolyte membrane or the film protruding to the outside of the membrane electrode composite can be eliminated or reduced.
  • FIG. 5 is an exploded cross-sectional view of a main part showing a fuel cell according to the first embodiment. It is sectional drawing of the main part which shows the manufacturing method of the fuel cell which concerns on Example 1.
  • FIG. FIG. 5 is an exploded cross-sectional view of a main part of the fuel cell according to the first modification of the first embodiment. It is sectional drawing of the main part which shows the manufacturing method of the fuel cell which concerns on modification 1 of Example 1.
  • FIG. 5 is an exploded cross-sectional view of a main part showing a fuel cell according to the second embodiment. It is sectional drawing of the main part which shows the manufacturing method of the fuel cell which concerns on Example 2.
  • FIG. It is sectional drawing of the main part which shows the time of assembling the conventional fuel cell. It is sectional drawing of the main part which shows the compression time of FIG. 10A. It is sectional drawing of the main part which shows the time of assembling other conventional fuel cell. It is sectional drawing of the main part which shows the compression time of FIG. 11A.
  • the fuel cell 1 includes a one-side separator 2, a other-side separator 3, and a membrane electrode composite (MEA: Membrane Electrode Assembly) 4.
  • the one-side separator 2 includes a seal member 6 arranged in a flatly formed arrangement portion 5 and a reaction flow path portion 7 through which the reaction gas flows.
  • the other side separator 3 includes a seal member 9 arranged in the arrangement portion 8 and a reaction flow path portion 10 through which the reaction gas flows.
  • the membrane electrode composite 4 is arranged between the one-side separator 2 and the other-side separator 3 via sealing members 6 and 9, respectively.
  • the membrane electrode composite 4 is composed of an electrolyte membrane 11, a pair of catalyst electrode layers (not shown), and a pair of gas diffusion layers 12 and 12.
  • the thick portion composed of the electrolyte membrane 11, the pair of catalyst electrode layers and the pair of gas diffusion layers 12 and 12 is referred to as the "main body portion 13", and the electrolyte membrane 11 projecting outward from the main body portion 13 is referred to as the "overhanging portion 14".
  • the overhanging portion 14 may be formed of a film.
  • the main body 13 of the membrane electrode composite 4 is sandwiched between the reaction flow paths 7 and 10 to form the reaction region 21, and the overhanging portion 14 is sandwiched between the seal members 6 and 9 to form the seal region 22. doing.
  • the contact surface 17b of the reaction flow path portion 7 of the one-side separator 2 that abuts on the main body 13 of the membrane electrode composite 4 is set at a position lower than the arrangement surface 5a of the arrangement portion 5 of the one-side separator 2. There is. That is, the contact surface 17b is set on the side away from the film electrode composite 4 with respect to the arrangement surface 5a of the one-side separator 2.
  • the contact surface 17b that abuts on the main body 13 of the membrane electrode composite 4 is provided on the one-side separator 2 arrangement portion 5. It is set at a position lower than the arrangement surface 5a.
  • the fuel cell 1 is a member that generates electricity by a chemical reaction with hydrogen (fuel gas) supplied from the anode side and oxygen (oxidation gas) supplied from the cathode side.
  • the fuel gas and oxidation gas are also collectively referred to as "reaction gas”.
  • the fuel cell stack is formed by stacking a plurality of fuel cell cells 1 and compressing them with a predetermined clearance or load between adjacent fuel cell cells 1 and 1.
  • the one-side separator 2 is a plate-shaped member arranged under the film electrode composite 4 in this embodiment.
  • the one-side separator 2 has an arrangement portion 5 and a reaction flow path portion 7.
  • the arrangement portion 5 is a portion where the seal member 6 is arranged, and is formed flat without a convex bead.
  • the arranging portion 5 is formed on the surface of the one-side separator 2 facing the film electrode composite 4.
  • the arrangement portion 5 has a flat shape without convex beads or the like, but a groove or the like may be formed in a part of the arrangement portion 5 within a range in which the seal member 6 can be arranged flat.
  • the seal member 6 is made of an elastic material and is a flat gasket having a rectangular cross section in this embodiment.
  • the sealing member 6 may be formed of an elastic material, and for example, ethylene propylene diene rubber (EPDM), silicone rubber (VMQ), fluororubber (FKM), polyisobutylene (PIB), or the like can be used.
  • EPDM ethylene propylene diene rubber
  • VMQ silicone rubber
  • FKM fluororubber
  • PIB polyisobutylene
  • the seal member 6 can be integrally molded with the one-side separator 2, or can be formed by molding the seal member 6 and then attaching the seal member 6 to the one-side separator 2. Further, the seal member 6 can be integrally molded with the resin reinforcing body with an adhesive and attached to the one-side separator 2.
  • the shape of the seal member 6 may be appropriately set, but in this embodiment, it is preferable that the contact surface 6a with which the overhanging portion 14 (electrolyte film 11 or film) abuts is flat.
  • a plurality of flow path grooves 17 are formed in the reaction flow path portion 7 in order to widely diffuse the reaction gas in the reaction region.
  • a plurality of contact surfaces 17b that come into contact with the main body 13 of the film electrode composite 4 are formed between the adjacent flow path grooves 17 and 17.
  • the contact surfaces 17b are formed at the same height position, and are parallel to the arrangement surface 5a of the arrangement portion 5.
  • the contact surface 17b is set to be lower than the arrangement surface 5a of the arrangement portion 5 in the thickness direction of the electrolyte membrane 11 (the side away from the electrolyte membrane 11).
  • the other side separator 3 is a plate-shaped member arranged on the upper side of the membrane electrode composite 4 in this embodiment.
  • the other side separator 3 has an arrangement portion 8 and a reaction flow path portion 10.
  • the arrangement portion 8 is a portion where the seal member 9 is arranged, and is formed flat without a convex bead.
  • the arrangement portion 8 is formed on a surface facing the film electrode composite 4. Although the arrangement portion 8 is flat in this embodiment, a groove or the like may be formed in a part of the arrangement portion 8.
  • the seal member 9 is made of an elastic material, and in this embodiment, it is a lip gasket whose diameter is reduced toward the tip.
  • the elastic material of the sealing member 9 is the same as that of the sealing member 6. Further, the molding method of the seal member 9 and the other side separator 3 is the same as that of the seal member 6.
  • the shape of the sealing member 9 is not particularly limited as long as it can be sealed so that the reaction gas does not leak.
  • a plurality of flow path grooves 18 for widely diffusing the reaction gas into the reaction region are formed in the reaction flow path portion 10.
  • a plurality of contact surfaces 18b that come into contact with the main body 13 of the film electrode composite 4 are formed between the adjacent flow path grooves 18 and 18.
  • the contact surfaces 18b are formed at the same height position, and are parallel to the arrangement surface 8a of the arrangement portion 8.
  • the contact surface 18b is set so as to be lower than the arrangement surface 8a of the arrangement portion 8 (the side close to the electrolyte membrane 11) in the thickness direction of the electrolyte membrane 11. Further, the bottom surface 18a of the flow path groove 18 is formed between the arrangement surface 8a and the contact surface 18b in this embodiment.
  • the thickness of the main body 13 of the film electrode composite 4 is sufficiently larger than the thickness of the overhanging portion 14.
  • the overhanging portion 14 is formed of an electrolyte membrane 11 or a film.
  • the main body 13 of the membrane electrode composite 4 is sandwiched between the contact surface 17b of the reaction flow path portion 7 and the contact surface 18b of the reaction flow path portion 10. As a result, a reaction region 21 is formed in which the chemical reaction of the reaction gas is promoted. Further, the overhanging portion 14 of the film electrode composite 4 is sandwiched between the sealing members 6 and 9. As a result, a sealing region 22 in which the reaction gas is sealed is formed.
  • the position of the overhanging portion 14 (electrolyte film 11 or film) is substantially the same height between the reaction region 21 and the seal region 22. That is, the overhanging portion 14 is substantially parallel to the arranging portion 5 of the one-side separator 2 between the reaction region 21 and the seal region 22.
  • the thickness of the seal member 6 arranged on the one-side separator 2 before assembly is t1
  • the crushing allowance of the seal member 6 arranged on the one-side separator 2 is t1 C.
  • the height from the contact surface 17b of the reaction flow path portion 7 of the one-side separator 2 to the arrangement surface 5a of the arrangement portion 5 of the one-side separator 2 is defined as t2.
  • the thickness dimension of the gas diffusion layer 12 arranged on the one-side separator 2 side before assembly is T GDL, and the crushing allowance dimension of the gas diffusion layer 12 is T C.
  • the height dimension from the bottom surface 17a of the flow path groove 17 to the contact surface 17b is t3.
  • the height dimension from the bottom surface 17a of the flow path groove 17 to the arrangement surface 5a of the arrangement portion 5 is t4.
  • each dimension is set so as to satisfy the following equation (1).
  • each dimension may be set so as to satisfy the following formula (2) within a range in which the chemical reaction of the reaction gas is promoted.
  • each dimension is set so as to satisfy the following equations (3) and (4).
  • equations (1), (2), (3) and (4) are examples, and the dimensions of each part can be appropriately designed.
  • the heights t3 and t6 of the flow path grooves 17 and 18 may be appropriately set from the fluidity of the reaction gas (hydrogen, oxygen) and cooling water and the compressibility of the gas diffusion layer 12.
  • a preparation step, a membrane electrode composite placement step, a separator placement step on the other side, and a compression step are performed.
  • the preparation step is a step of preparing the one-side separator 2, the other-side separator 3, and the film electrode composite 4 described above.
  • the membrane electrode composite arranging step is a step of arranging the membrane electrode composite 4 on the one-side separator 2.
  • the main body 13 of the membrane electrode composite 4 is arranged on the contact surface 17b of the reaction flow path portion 7, and the overhanging portion 14 is arranged on the contact surface 6a of the seal member 6. At this time, the height position of the overhanging portion 14 (electrolyte film 11 or film) can be made substantially constant.
  • the other side separator arranging step is a step of arranging the other side separator 3 on the membrane electrode composite 4.
  • the contact surface 18b of the reaction flow path portion 10 is brought into contact with the main body portion 13 of the membrane electrode composite 4, and the overhanging portion 14 is made to face the seal member 6 while facing the seal member 9. Make contact with.
  • the compression step a plurality of assembled fuel cell cells 1 are laminated, and a force is applied in a direction in which the one-side separator 2 and the other-side separator 3 are brought close to each other with a predetermined clearance or load to compress the fuel cells.
  • the sealing members 6 and 9 are contracted, and the gas diffusion layers 12 and 12 are also contracted.
  • the overhanging portion 14 is wrinkle-free and is substantially parallel to the arranging portion 5 of the one-side separator 2.
  • the contact surface 17b of the reaction flow path portion 7 is from the arrangement surface 5a of the arrangement portion 5 of the one-side separator 2. Is also set at a low position (a position away from the electrolyte membrane 11).
  • the contact surface 6a of the seal member 6 and the contact surface 17b of the flow path groove 17 are provided with a step for absorbing the thickness of the gas diffusion layer 12 of the membrane electrode composite 4.
  • the overhanging portions 112 and 212 are bent during assembly, the overhanging portions 112 and 212 are likely to be wrinkled during compression.
  • the membrane electrode is used. Since the deflection can be eliminated or reduced in the complex arrangement step, the wrinkles of the overhanging portion 14 can be eliminated or reduced in the fuel cell 1 after the compression step.
  • the sum of the crushing allowance t1c of the seal member 6 of the one-side separator 2 and the crushing allowance of the one-side separator 2 (substantially zero because there is no convex bead) in the seal region 22 is the sum of the crushing allowance t1c and the other-side separator. It is set to be smaller than the sum of the crushing allowance t10c of the seal member 9 of 3 and the crushing allowance of the other side separator 3 (substantially zero because there is no convex bead).
  • the overhang in the seal region 22 during the compression step is set.
  • the displacement of the portion 14 in the height direction (the thickness direction of the electrolyte film 11) can be reduced.
  • the wrinkles of the overhanging portion 14 can be eliminated or reduced even during the compression step.
  • each member may be appropriately set, but if the conditions are set as in the above formula (1), the height position of the electrolyte membrane 11 on the reaction region 21 side after compression is set. And, the height position of the overhanging portion 14 (electrolyte film 11 or film) on the seal region 22 side can be made substantially the same. As a result, the wrinkles of the overhanging portion 14 can be eliminated or made smaller.
  • the height position with respect to the reaction flow path portion 10 side can be easily adjusted while flattening the arrangement portion 8.
  • the overhanging portion 14 is prevented from being wrinkled. Can be prevented. Further, by arranging the film electrode composite 4 on the arrangement portion 5 of the one-side separator 2 which is formed flat, the overhanging portion 14 is bent at the time of assembling each member by a simple operation. It is possible to prevent wrinkles from being generated in the overhanging portion 14.
  • FIG. 4 is an exploded cross-sectional view of a main part of the fuel cell according to the first modification of the first embodiment.
  • FIG. 5 is a cross-sectional view of a main part showing a method of manufacturing a fuel cell according to the first modification of the first embodiment.
  • the modification 1 is different from the first embodiment in that the receiving portions 31 and 31 are formed on the one-side separator 2.
  • the parts different from the first embodiment will be mainly described.
  • the receiving portion 31 is formed on both sides of the seal member 6 in the arranging portion 5 of the one-side separator 2.
  • the receiving portion 31 may be formed intermittently or continuously with respect to the extension direction of the seal member 6. Further, the receiving portion 31 may be formed only on one side of the seal member 6.
  • the shape of the receiving portion 31 is not particularly limited, but in this modified example, it is formed so as to reduce the diameter toward the tip.
  • the height dimension of the receiving portion 31 is set to be larger than the thickness of the seal member 6 before assembly.
  • the material of the receiving portion 31 is not particularly limited, and for example, silicone rubber (VMQ), ethylene propylene diene rubber (EPDM), polyisobutylene (PIB), resin and the like can be used.
  • the membrane electrode composite 4 is arranged on the one-side separator 2.
  • the main body 13 of the membrane electrode composite 4 is arranged on the contact surfaces 17b and 17b of the reaction flow path 7, and the overhanging portion 14 is arranged on the receiving portions 31 and 31.
  • the overhanging portion 14 comes into contact with the tips of the receiving portions 31 and 31, but is separated from the contact surface 6a of the seal member 6.
  • the separation dimension may be set as appropriate, but is set to, for example, 0.1 mm.
  • the gap from the contact surface 6a of the seal member 6 to the overhanging portion 14 is drawn larger than the actual one.
  • the overhanging portions 14 come into contact with the sealing members 6 and 9, respectively, as in the first embodiment. Be pinched. Therefore, it is preferable to set the receiving portion 31 to a material, shape, or the like that does not affect the sealing mechanism.
  • the sealing member 6 has adhesiveness (tackiness)
  • the film electrode composite arranging step and the other side separator arranging step are performed, the overhanging portion 14 and the sealing member 6 stick to each other, and the work It may increase the time and cause bending, wrinkles, etc.
  • the overhanging portion 14 and the sealing member 6 are attached to each other before the compression step is performed. It can be prevented from sticking. As a result, even when the seal member 6 has a high tack property, the overhanging portion 14 is difficult to stick to the seal member 6, the assembly becomes easy, and the working time can be shortened. Further, it is possible to prevent the overhanging portion 14 from sticking to the seal member 6 in a state of being bent. Further, if the receiving portion 31 is made of a material having low tackiness, workability can be further improved.
  • FIG. 6 is a cross-sectional view of a main part showing a method of manufacturing a fuel cell according to the second modification of the first embodiment.
  • the receiving portions 31 and 31 may be provided on the overhanging portion 14 (electrolyte film 11 or film).
  • the receiving portions 31 and 31 according to the modified example 2 are formed on the surface of the overhanging portion 14 facing the one-side separator 2.
  • the receiving portions 31 and 31 are formed so as to be arranged on both sides of the seal member 6 in the overhanging portion 14.
  • the receiving portion 31 may be formed intermittently or continuously with respect to the extension direction of the seal member 6. Further, the receiving portion 31 may be formed so as to be arranged only on one side of the seal member 6.
  • the membrane electrode composite 4 is placed on the one-side separator 2 as shown in FIG.
  • the main body 13 of the membrane electrode composite 4 is arranged on the contact surfaces 17b and 17b of the reaction flow path portion 7, and the tips of the receiving portions 31 and 31 are brought into contact with the arrangement portion 5 of the one-side separator 2.
  • the overhanging portion 14 and the seal member 6 are separated from each other.
  • the receiving portions 31 and 31 may be provided in the overhanging portion 14. Even with the configuration of the modified example 2, the same effect as that of the modified example 1 can be obtained.
  • FIG. 7 is a cross-sectional view of a main part showing the fuel cell according to the second embodiment.
  • the fuel cell 1A according to the second embodiment is mainly different in that the convex bead 41 is provided on the other side separator 3A and that the seal member 42 is used.
  • the parts different from the first embodiment will be mainly described.
  • the other side separator 3A includes a convex bead 41, a sealing member 42, and a reaction flow path portion 10.
  • the convex bead 41 is a portion that protrudes toward the one-side separator 2 side.
  • a flat arrangement portion 43 for arranging the seal member 42 is formed.
  • the seal member 42 is provided in the arrangement portion 43.
  • the sealing member 42 uses a flat gasket having a rectangular cross section.
  • FIG. 8 is an exploded cross-sectional view of a main part showing the fuel cell according to the second embodiment.
  • the dimensions and conditions of each member are substantially the same as those in the first embodiment.
  • the height dimension of the convex bead 41 before assembly is t11, and the crushing allowance of the convex bead 41 is t11c.
  • the thickness dimension of the seal member 42 arranged on the other side separator 3A before assembly is t12, and the crushing allowance of the seal member 42 is t12c.
  • the method for manufacturing the fuel cell according to the second embodiment will be described.
  • the preparatory work step, the membrane electrode composite placement step, the other side separator placement step, and the compression step are performed.
  • the preparation step the one-side separator 2, the other-side separator 3A, and the film electrode composite 4 are prepared.
  • FIG. 9 is a cross-sectional view of a main part showing a method of manufacturing a fuel cell according to the second embodiment.
  • the film electrode composite arrangement step the film electrode composite 4 is arranged on the one-side separator 2 in the same manner as in the first embodiment.
  • the other-side separator arranging step the other-side separator 3A is arranged on the membrane electrode composite 4.
  • the main body 13 of the membrane electrode composite 4 is sandwiched between the reaction flow paths 7 and 10 to form the reaction region 21, and the overhanging portions 14 are sandwiched between the sealing members 6 and 42. To form the seal region 22.
  • the one-side separator 2 and the other-side separator 3A are compressed in a direction in which they are close to each other.
  • the sealing members 6 and 42 are compressed, and the convex beads 41 and the gas diffusion layers 12 and 12 are also compressed.
  • the overhanging portion 14 is substantially parallel to the arranging portion 5 of the one-side separator 2.
  • the fuel cell and the method for manufacturing the fuel cell according to the second embodiment can also achieve substantially the same effect as that of the first embodiment. Further, by providing the convex bead 41 on the other side separator 3A and providing the sealing member 42 on the convex bead 41, the height position with respect to the reaction flow path portion 10 side can be easily adjusted.
  • the sum of the crushing allowance t1c of the seal member 6 of the one-side separator 2 and the crushing allowance of the one-side separator 2 (substantially zero because there is no convex bead) in the seal region 22 is the crushing allowance of the convex bead 41 of the other-side separator 3A. It is set smaller than the sum of t11c and the crushing allowance t12c of the seal member 42 (t1c ⁇ (t11c + t12c)).
  • the crushing allowance t1c of the seal member 6 of the one-side separator 2 is set to be smaller than the sum of the crushing allowance t11c of the convex bead 41 of the other-side separator 3A and the crushing allowance t12c of the seal member 42, thereby compressing.
  • the displacement of the overhanging portion 14 in the sealing region 22 during the process in the height direction (thickness direction of the electrolyte film 11) can be reduced.
  • the wrinkles of the overhanging portion 14 can be eliminated or reduced even during the compression step.
  • the design can be appropriately modified without being limited to the above-described configuration.
  • the receiving portion 31 can also be provided in the embodiment of the second embodiment.

Abstract

The present invention is characterized by: having a one-side separator (2), an other-side separator (3), and a membrane electrode assembly (4) arranged with respective seal members (6, 9) therebetween; forming a reaction region (21) and a seal region (22); and a contact surface (17b), which is the portion of a reaction flow passage section (7) of the one-side separator (2) that is abutted by a main body section (13) of the membrane electrode assembly (4), being set so as to be further separated from the membrane electrode assembly (4) than a placement surface (5a) of a placement section (5) of the one-side separator (2).

Description

燃料電池セル及び燃料電池セルの製造方法Fuel cell and fuel cell manufacturing method
　本発明は、燃料電池セル及び燃料電池セルの製造方法に関する。 The present invention relates to a fuel cell and a method for manufacturing a fuel cell.
　燃料電池セルは、例えば、特許文献１に示すように、膜電極複合体（ＭＥＡ：Membrane Electrode Assembly）と、膜電極複合体を挟持する一対のセパレータと、一対のセパレータと膜電極複合体との間にそれぞれ介設されるシール部材と、を備えている。膜電極複合体は、電解質膜、一対の触媒電極層及び一対のガス拡散層を備えている。ここで、膜電極複合体のうち、触媒電極層及びガス拡散層が形成されている部位を「本体部」とし、当該本体部から外側に張り出す電解質膜又はフィルムを「張出部」とする。シール部材は、例えば、弾性体やガスケット等である。 As shown in Patent Document 1, for example, a fuel cell is composed of a membrane electrode assembly (MEA: Membrane Electrode Assembly), a pair of separators sandwiching the membrane electrode composite, and a pair of separators and a membrane electrode composite. It is provided with a sealing member, which is interposed between them. The membrane electrode composite comprises an electrolyte membrane, a pair of catalyst electrode layers and a pair of gas diffusion layers. Here, in the membrane electrode composite, the portion where the catalyst electrode layer and the gas diffusion layer are formed is referred to as a "main body portion", and the electrolyte membrane or film protruding outward from the main body portion is referred to as an "overhanging portion". .. The sealing member is, for example, an elastic body, a gasket, or the like.
　膜電極複合体の本体部は、一対のセパレータに設けられた反応流路部同士に挟持されて反応領域を形成する。膜電極複合体の張出部は、一対のセパレータに設けられたシール部材同士に挟持されてシール領域を形成する。燃料電池スタックは、燃料電池セルを複数個積層させ、燃料電池セル間で所定のクリアランス又は荷重で圧縮して構成される。燃料電池セルが圧縮される際、膜電極複合体もシール部材を介して圧縮されるが、シール領域と反応領域の間の張出部にしわが発生しないことが望ましい。 The main body of the membrane electrode composite is sandwiched between the reaction flow paths provided in the pair of separators to form a reaction region. The overhanging portion of the film electrode composite is sandwiched between the sealing members provided on the pair of separators to form a sealing region. The fuel cell stack is formed by stacking a plurality of fuel cell cells and compressing the fuel cell cells with a predetermined clearance or load. When the fuel cell is compressed, the membrane electrode composite is also compressed via the sealing member, but it is desirable that no wrinkles are generated in the overhanging portion between the sealing region and the reaction region.
　図１０Ａは、従来の燃料電池セルの組付け時を示す要部断面図である。図１０Ｂは、図１０Ａの圧縮時を示す要部断面図である。図１１Ａは、従来の他の燃料電池セルの組付け時を示す要部断面図である。図１１Ｂは、図１１Ａの圧縮時を示す要部断面図である。 FIG. 10A is a cross-sectional view of a main part showing the time when the conventional fuel cell is assembled. FIG. 10B is a cross-sectional view of a main part showing the time of compression of FIG. 10A. FIG. 11A is a cross-sectional view of a main part showing a time when another conventional fuel cell is assembled. FIG. 11B is a cross-sectional view of a main part showing the time of compression of FIG. 11A.
　図１０Ａに示すように、従来の燃料電池セル１００は、セパレータ１０１と、セパレータ１０２と、膜電極複合体１０３と、を備えている。下側に配置されるセパレータ１０１は、反応流体が流通する反応流路部１０６と、シール部材１０４が配置される凸ビード１０８とを備えている。上側に配置されるセパレータ１０２は、反応流体が流通する反応流路部１０７と、シール部材１０５が配置される凸ビード１０９とを備えている。 As shown in FIG. 10A, the conventional fuel cell 100 includes a separator 101, a separator 102, and a membrane electrode composite 103. The separator 101 arranged on the lower side includes a reaction flow path portion 106 through which the reaction fluid flows, and a convex bead 108 on which the seal member 104 is arranged. The separator 102 arranged on the upper side includes a reaction flow path portion 107 through which the reaction fluid flows, and a convex bead 109 on which the seal member 105 is arranged.
　燃料電池セル１００を組み付ける際は、まず、下側のセパレータ１０１の上に、膜電極複合体１０３を配置する。膜電極複合体１０３の本体部１１１を反応流路部１０６の上に配置し、張出部（電解質膜又はフィルム）１１２をシール部材１０４の上に配置する。張出部１１２は、本体部１１１よりも外側に張り出す部位である。このとき、シール部材１０４と反応流路部１０６との間において、張出部１１２にはその自重によりたわみ１２０が形成される。 When assembling the fuel cell 100, first, the membrane electrode composite 103 is placed on the lower separator 101. The main body 111 of the membrane electrode composite 103 is placed on the reaction flow path 106, and the overhang (electrolyte film or film) 112 is placed on the seal member 104. The overhanging portion 112 is a portion that overhangs the main body portion 111 to the outside. At this time, a deflection 120 is formed in the overhanging portion 112 between the sealing member 104 and the reaction flow path portion 106 due to its own weight.
　図１０Ｂに示すように、セパレータ１０１，１０２同士を近接させる方向に力を付与すると、シール領域では凸ビード１０８，１０９がそれぞれ高さ方向に収縮するとともに、シール部材１０４，１０５も収縮する。また、反応領域では、膜電極複合体１０３の本体部１１１のガス拡散層が収縮する。これにより、シール領域の張出部１１２の高さ位置と、反応領域での電解質膜の高さ位置は概ね同一となる。一方、張出部１１２においては、シール領域と反応領域の間にしわ１２０Ａが発生するおそれがある。 As shown in FIG. 10B, when a force is applied in the direction in which the separators 101 and 102 are brought close to each other, the convex beads 108 and 109 contract in the height direction and the seal members 104 and 105 also contract in the seal region. Further, in the reaction region, the gas diffusion layer of the main body 111 of the membrane electrode composite 103 shrinks. As a result, the height position of the overhanging portion 112 in the seal region and the height position of the electrolyte membrane in the reaction region are substantially the same. On the other hand, in the overhanging portion 112, wrinkles 120A may occur between the seal region and the reaction region.
　図１１Ａに示すように、従来の他の燃料電池セル２００は、セパレータ２０１と、セパレータ２０２と、膜電極複合体２０３と、を備えている。下側に配置されるセパレータ２０１は、シール部材２０４及び反応流体が流通する反応流路部２０６を備えている。シール部材２０４は、先端に向かうにつれて縮径するリップガスケットである。上側に配置されるセパレータ２０２は、シール部材２０５及び反応流体が流通する反応流路部２０７を備えている。 As shown in FIG. 11A, another conventional fuel cell 200 includes a separator 201, a separator 202, and a membrane electrode composite 203. The separator 201 arranged on the lower side includes a sealing member 204 and a reaction flow path portion 206 through which the reaction fluid flows. The sealing member 204 is a lip gasket whose diameter decreases toward the tip. The separator 202 arranged on the upper side includes a sealing member 205 and a reaction flow path portion 207 through which the reaction fluid flows.
　燃料電池セル２００を組み付ける際には、まず、セパレータ２０１の上に、膜電極複合体２０３を配置する。膜電極複合体２０３の本体部２１１は反応流路部２０６の上に配置し、張出部（電解質膜又はフィルム）２１２はシール部材２０４の上に配置する。このとき、シール部材２０４と反応流路部２０６との間において、張出部２１２にはその自重によりたわみ２２０が形成されている。 When assembling the fuel cell 200, first, the membrane electrode composite 203 is arranged on the separator 201. The main body 211 of the membrane electrode composite 203 is arranged on the reaction flow path 206, and the overhang (electrolyte film or film) 212 is arranged on the seal member 204. At this time, a deflection 220 is formed in the overhanging portion 212 between the sealing member 204 and the reaction flow path portion 206 due to its own weight.
　図１１Ｂに示すように、セパレータ２０１，２０２同士を近接させる方向に力を付与すると、シール領域ではシール部材２０４及びシール部材２０５は高さ方向に収縮する。また、反応領域では、膜電極複合体２０３の本体部２１１のガス拡散層が収縮する。一方、張出部２１２においては、シール領域と反応領域の間にしわ２２０Ａが発生するおそれがある。 As shown in FIG. 11B, when a force is applied in the direction in which the separators 201 and 202 are brought close to each other, the seal member 204 and the seal member 205 contract in the height direction in the seal region. Further, in the reaction region, the gas diffusion layer of the main body 211 of the membrane electrode composite 203 shrinks. On the other hand, in the overhanging portion 212, wrinkles 220A may occur between the seal region and the reaction region.
特開２００９－３７９６０号公報Japanese Unexamined Patent Publication No. 2009-37960
　膜電極複合体１０３，２０３の外側に張り出す張出部（本体部の外側に張り出す電解質膜又はフィルム）１１２，２１２にはしわが発生しないことが望ましい。しかしながら、燃料電池セル１００，２００は、いずれも組付け時に膜電極複合体１０３，２０３にたわみ１２０，２２０が発生しており、当該たわみ１２０，２２０に起因して圧縮時にしわ１２０Ａ，２２０Ａが発生すると推察される。 It is desirable that wrinkles do not occur on the overhanging portions (electrolyte film or film overhanging the outside of the main body portion) 112 and 212 that overhang the membrane electrode composites 103 and 203. However, in each of the fuel cell cells 100 and 200, the film electrode composites 103 and 203 have deflections 120 and 220 during assembly, and the deflections 120 and 220 cause wrinkles 120A and 220A during compression. Then it is inferred.
　また、膜電極複合体１０３，２０３の外側に張り出す張出部１１２，２１２は、薄くかつ柔らかい材料で形成されているため、たわみやしわが発生しやすい。さらに、シール部材２０４のように高さの大きいリップガスケットを用いる場合、つぶし代分高く設定されていることも張出部１１２，２１２のたわみの要因となる。 Further, since the overhanging portions 112 and 212 protruding to the outside of the membrane electrode composites 103 and 203 are made of a thin and soft material, bending and wrinkling are likely to occur. Further, when a lip gasket having a large height such as the sealing member 204 is used, the fact that the crushing allowance is set higher also causes the overhanging portions 112 and 212 to bend.
　本発明はかかる課題を解決するために発明されたものであり、膜電極複合体の外側に張り出す電解質膜又はフィルムのしわを無くすか、小さくことができる燃料電池セル及び燃料電池セルの製造方法を提供することを課題とする。 The present invention has been invented to solve such a problem, and is a method for manufacturing a fuel cell and a fuel cell, which can eliminate or reduce wrinkles of an electrolyte membrane or a film overhanging the outside of a membrane electrode composite. The challenge is to provide.
　前記課題を解決するための本発明は、平坦に形成された配置部に配置されたシール部材及び反応ガスが流通する反応流路部を備えた一方側セパレータと、配置部に配置されたシール部材及び反応ガスが流通する反応流路部を備えた他方側セパレータと、前記一方側セパレータと前記他方側セパレータとの間にそれぞれ前記シール部材を介して配置された膜電極複合体と、を有し、前記膜電極複合体の本体部が反応流路部同士に挟持されることにより反応領域が形成されているとともに、前記本体部から張り出した電解質膜又はフィルムが前記シール部材同士に挟持されることによりシール領域が形成され、前記一方側セパレータの前記反応流路部のうち前記膜電極複合体の前記本体部が当接する当接面は、前記一方側セパレータの前記配置部の配置面よりも前記膜電極複合体から離間する側に設定されていることを特徴とする。 The present invention for solving the above-mentioned problems includes a seal member arranged in a flatly formed arrangement portion, a one-side separator provided with a reaction flow path portion through which a reaction gas flows, and a seal member arranged in the arrangement portion. And a film electrode composite having a reaction flow path portion through which the reaction gas flows, and a film electrode composite arranged between the one side separator and the other side separator via the seal member, respectively. The reaction region is formed by sandwiching the main body of the film electrode composite between the reaction flow paths, and the electrolyte membrane or film protruding from the main body is sandwiched between the sealing members. The contact surface of the reaction flow path portion of the one-side separator to which the main body portion of the film electrode composite comes into contact is more than the arrangement surface of the arrangement portion of the one-side separator. It is characterized in that it is set on the side away from the film electrode composite.
　また、本発明は、平坦に形成された配置部に配置されたシール部材及び反応ガスが流通する反応流路部を備えた一方側セパレータと、配置部に配置されたシール部材及び反応ガスが流通する反応流路部を備えた他方側セパレータと、膜電極複合体と、を準備する準備工程と、前記一方側セパレータの上に前記膜電極複合体を配置し、前記膜電極複合体の本体部を前記一方側セパレータの前記反応流路部の上に配置するとともに、前記本体部から張り出した電解質膜又はフィルムを前記一方側セパレータの前記シール部材の上に配置する膜電極複合体配置工程と、前記膜電極複合体の上に前記他方側セパレータを配置し、前記反応流路部同士で前記膜電極複合体の本体部を挟持して反応領域を形成するとともに、前記シール部材同士で前記電解質膜又はフィルムを挟持してシール領域を形成する他方側セパレータ配置工程と、前記一方側セパレータと前記他方側セパレータとを近接させる方向に力を付与する圧縮工程と、を含み、前記一方側セパレータの前記反応流路部のうち前記膜電極複合体の前記本体部が当接する当接面を、前記一方側セパレータの前記配置部の配置面よりも前記膜電極複合体から離間する側に設定することを特徴とする。 Further, in the present invention, a one-side separator provided with a seal member arranged in a flatly formed arrangement portion and a reaction flow path portion through which the reaction gas flows, and a seal member and the reaction gas arranged in the arrangement portion flow. A preparatory step for preparing the other-side separator provided with the reaction flow path portion and the membrane electrode composite, and the membrane electrode composite is arranged on the one-side separator, and the main body portion of the membrane electrode composite is arranged. Is arranged on the reaction flow path portion of the one-side separator, and the electrolyte film or film projecting from the main body portion is arranged on the seal member of the one-side separator. The other side separator is arranged on the film electrode composite, the main body portion of the membrane electrode composite is sandwiched between the reaction flow paths, and a reaction region is formed, and the electrolyte membrane is formed between the seal members. Alternatively, the other-side separator arranging step of sandwiching the film to form a seal region and a compression step of applying a force in a direction in which the one-side separator and the other-side separator are brought close to each other are included. The contact surface of the reaction flow path portion to which the main body portion of the film electrode composite abuts is set to be closer to the side away from the membrane electrode composite than the arrangement surface of the arrangement portion of the one-side separator. It is a feature.
　かかる構成によれば、シール領域と反応領域の間において、組付け時の張出部（電解質膜又はフィルム）の高さの差を小さくすることができる。これにより、組付け時に張出部のたわみを無くすか、小さくすることができ、圧縮後においても膜電極複合体の張出部のしわを無くすか、小さくすることができる。 According to such a configuration, the difference in height of the overhanging portion (electrolyte film or film) at the time of assembly can be reduced between the seal region and the reaction region. As a result, the deflection of the overhanging portion can be eliminated or reduced during assembly, and the wrinkles of the overhanging portion of the membrane electrode composite can be eliminated or reduced even after compression.
　本発明の燃料電池セル及び燃料電池セルの製造方法によれば、膜電極複合体の外側に張り出す電解質膜又はフィルムのしわを無くすか、小さくすることができる。 According to the fuel cell and the method for manufacturing a fuel cell of the present invention, the wrinkles of the electrolyte membrane or the film protruding to the outside of the membrane electrode composite can be eliminated or reduced.
実施例１に係る燃料電池セルを示す要部断面図である。It is sectional drawing of the main part which shows the fuel cell which concerns on Example 1. FIG. 実施例１に係る燃料電池セルを示す要部分解断面図である。FIG. 5 is an exploded cross-sectional view of a main part showing a fuel cell according to the first embodiment. 実施例１に係る燃料電池セルの製造方法を示す要部断面図である。It is sectional drawing of the main part which shows the manufacturing method of the fuel cell which concerns on Example 1. FIG. 実施例１の変形例１に係る燃料電池セルの要部分解断面図である。FIG. 5 is an exploded cross-sectional view of a main part of the fuel cell according to the first modification of the first embodiment. 実施例１の変形例１に係る燃料電池セルの製造方法を示す要部断面図である。It is sectional drawing of the main part which shows the manufacturing method of the fuel cell which concerns on modification 1 of Example 1. FIG. 実施例１の変形例２に係る燃料電池セルの製造方法を示す要部断面図である。It is sectional drawing of the main part which shows the manufacturing method of the fuel cell which concerns on modification 2 of Example 1. FIG. 実施例２に係る燃料電池セルを示す要部断面図である。It is sectional drawing of the main part which shows the fuel cell which concerns on Example 2. 実施例２に係る燃料電池セルを示す要部分解断面図である。FIG. 5 is an exploded cross-sectional view of a main part showing a fuel cell according to the second embodiment. 実施例２に係る燃料電池セルの製造方法を示す要部断面図である。It is sectional drawing of the main part which shows the manufacturing method of the fuel cell which concerns on Example 2. FIG. 従来の燃料電池セルの組付け時を示す要部断面図である。It is sectional drawing of the main part which shows the time of assembling the conventional fuel cell. 図１０Ａの圧縮時を示す要部断面図である。It is sectional drawing of the main part which shows the compression time of FIG. 10A. 従来の他の燃料電池セルの組付け時を示す要部断面図である。It is sectional drawing of the main part which shows the time of assembling other conventional fuel cell. 図１１Ａの圧縮時を示す要部断面図である。It is sectional drawing of the main part which shows the compression time of FIG. 11A.
　図１に示すように、本実施形態に係る燃料電池セル１は、一方側セパレータ２と、他方側セパレータ３と、膜電極複合体（ＭＥＡ：Membrane Electrode Assembly）４とを備えている。一方側セパレータ２は、平坦に形成された配置部５に配置されたシール部材６及び反応ガスが流通する反応流路部７を備えている。他方側セパレータ３は、配置部８に配置されたシール部材９及び反応ガスが流通する反応流路部１０を備えている。 As shown in FIG. 1, the fuel cell 1 according to the present embodiment includes a one-side separator 2, a other-side separator 3, and a membrane electrode composite (MEA: Membrane Electrode Assembly) 4. The one-side separator 2 includes a seal member 6 arranged in a flatly formed arrangement portion 5 and a reaction flow path portion 7 through which the reaction gas flows. The other side separator 3 includes a seal member 9 arranged in the arrangement portion 8 and a reaction flow path portion 10 through which the reaction gas flows.
　膜電極複合体４は、一方側セパレータ２と他方側セパレータ３との間にそれぞれシール部材６，９を介して配置されている。膜電極複合体４は、電解質膜１１、一対の触媒電極層（図示省略）及び一対のガス拡散層１２，１２で構成されている。電解質膜１１、一対の触媒電極層及び一対のガス拡散層１２，１２で構成される厚い部位を「本体部１３」とし、本体部１３から外側に張り出す電解質膜１１を「張出部１４」とする。張出部１４は、フィルムで形成されている場合もある。 The membrane electrode composite 4 is arranged between the one-side separator 2 and the other-side separator 3 via sealing members 6 and 9, respectively. The membrane electrode composite 4 is composed of an electrolyte membrane 11, a pair of catalyst electrode layers (not shown), and a pair of gas diffusion layers 12 and 12. The thick portion composed of the electrolyte membrane 11, the pair of catalyst electrode layers and the pair of gas diffusion layers 12 and 12 is referred to as the "main body portion 13", and the electrolyte membrane 11 projecting outward from the main body portion 13 is referred to as the "overhanging portion 14". And. The overhanging portion 14 may be formed of a film.
　膜電極複合体４の本体部１３が反応流路部７，１０同士に挟持されて反応領域２１を形成するとともに、張出部１４がシール部材６，９同士に挟持されてシール領域２２を形成している。一方側セパレータ２の反応流路部７のうち膜電極複合体４の本体部１３に当接する当接面１７ｂは、一方側セパレータ２の配置部５の配置面５ａよりも低い位置に設定されている。つまり、当接面１７ｂは、一方側セパレータ２の配置面５ａよりも膜電極複合体４から離間する側に設定されている。 The main body 13 of the membrane electrode composite 4 is sandwiched between the reaction flow paths 7 and 10 to form the reaction region 21, and the overhanging portion 14 is sandwiched between the seal members 6 and 9 to form the seal region 22. doing. The contact surface 17b of the reaction flow path portion 7 of the one-side separator 2 that abuts on the main body 13 of the membrane electrode composite 4 is set at a position lower than the arrangement surface 5a of the arrangement portion 5 of the one-side separator 2. There is. That is, the contact surface 17b is set on the side away from the film electrode composite 4 with respect to the arrangement surface 5a of the one-side separator 2.
　図３に示すように、本実施形態の燃料電池セル及び燃料電池セルの製造方法では、膜電極複合体４の本体部１３に当接する当接面１７ｂを、一方側セパレータ２の配置部５の配置面５ａよりも低い位置に設定している。これにより、一方側セパレータ２の上に膜電極複合体４を配置したときに、張出部１４（電解質膜１１又はフィルム）を概ね平坦にすることができる。また、圧縮時においても張出部１４の高さ方向の変位を少なくすることができる。これにより、燃料電池セル１を組み付ける際に、反応領域２１とシール領域２２との間の張出部１４のたわみを無くすか、小さくすることができ、圧縮後においても、張出部１４のしわを無くすか、小さくすることができる。以下、実施例について詳細に説明する。 As shown in FIG. 3, in the fuel cell and the fuel cell manufacturing method of the present embodiment, the contact surface 17b that abuts on the main body 13 of the membrane electrode composite 4 is provided on the one-side separator 2 arrangement portion 5. It is set at a position lower than the arrangement surface 5a. As a result, when the membrane electrode composite 4 is arranged on the one-side separator 2, the overhanging portion 14 (electrolyte film 11 or film) can be made substantially flat. Further, the displacement of the overhanging portion 14 in the height direction can be reduced even during compression. As a result, when the fuel cell 1 is assembled, the deflection of the overhanging portion 14 between the reaction region 21 and the sealing region 22 can be eliminated or reduced, and the wrinkles of the overhanging portion 14 can be reduced even after compression. Can be eliminated or reduced. Hereinafter, examples will be described in detail.
［実施例１］
　図１に示すように、燃料電池セル１は、アノード側より供給される水素（燃料ガス）、カソード側より供給される酸素（酸化ガス）との化学反応により発電する部材である。前記燃料ガス及び酸化ガスを総称して「反応ガス」とも言う。燃料電池スタックは、燃料電池セル１を複数個積層させ、隣り合う燃料電池セル１，１間で所定のクリアランス又は荷重で圧縮することで形成される。 [Example 1]
As shown in FIG. 1, the fuel cell 1 is a member that generates electricity by a chemical reaction with hydrogen (fuel gas) supplied from the anode side and oxygen (oxidation gas) supplied from the cathode side. The fuel gas and oxidation gas are also collectively referred to as "reaction gas". The fuel cell stack is formed by stacking a plurality of fuel cell cells 1 and compressing them with a predetermined clearance or load between adjacent fuel cell cells 1 and 1.
　一方側セパレータ２は、本実施例では膜電極複合体４の下側に配置される板状部材である。一方側セパレータ２は、配置部５と、反応流路部７とを有する。配置部５は、シール部材６が配置される部位であり、凸ビードが無く平坦に形成されている。配置部５は、一方側セパレータ２のうち膜電極複合体４に対向する面に形成されている。配置部５は、本実施例では凸ビード等が無い平坦な形状になっているが、シール部材６を平坦に配置できる範囲で配置部５の一部に溝等が形成されていてもよい。 The one-side separator 2 is a plate-shaped member arranged under the film electrode composite 4 in this embodiment. The one-side separator 2 has an arrangement portion 5 and a reaction flow path portion 7. The arrangement portion 5 is a portion where the seal member 6 is arranged, and is formed flat without a convex bead. The arranging portion 5 is formed on the surface of the one-side separator 2 facing the film electrode composite 4. In the present embodiment, the arrangement portion 5 has a flat shape without convex beads or the like, but a groove or the like may be formed in a part of the arrangement portion 5 within a range in which the seal member 6 can be arranged flat.
　シール部材６は、弾性材料で形成されており、本実施例では断面矩形のフラットガスケットである。シール部材６は、弾性を有する材料で形成すればよく、例えば、エチレンプロピレンジエンゴム（ＥＰＤＭ）、シリコーンゴム（ＶＭＱ）、フッ素ゴム（ＦＫＭ）、ポリイソブチレン（ＰＩＢ）等を用いることができる。 The seal member 6 is made of an elastic material and is a flat gasket having a rectangular cross section in this embodiment. The sealing member 6 may be formed of an elastic material, and for example, ethylene propylene diene rubber (EPDM), silicone rubber (VMQ), fluororubber (FKM), polyisobutylene (PIB), or the like can be used.
　シール部材６は、一方側セパレータ２に一体成形されるか、又は、シール部材６を成形した後、当該シール部材６を一方側セパレータ２に貼り付けて形成することができる。また、粘着剤付きの樹脂補強体にシール部材６を一体成形して一方側セパレータ２に貼り付けることもできる。シール部材６の形状は、適宜設定すればよいが、本実施例では張出部１４（電解質膜１１又はフィルム）が当接する当接面６ａが平坦であることが好ましい。 The seal member 6 can be integrally molded with the one-side separator 2, or can be formed by molding the seal member 6 and then attaching the seal member 6 to the one-side separator 2. Further, the seal member 6 can be integrally molded with the resin reinforcing body with an adhesive and attached to the one-side separator 2. The shape of the seal member 6 may be appropriately set, but in this embodiment, it is preferable that the contact surface 6a with which the overhanging portion 14 (electrolyte film 11 or film) abuts is flat.
　反応流路部７には、反応ガスを反応領域に広く拡散させるために複数の流路溝１７が形成されている。隣り合う流路溝１７，１７の間には、膜電極複合体４の本体部１３に当接する複数の当接面１７ｂが形成されている。当接面１７ｂは、それぞれ同じ高さ位置に形成されており、配置部５の配置面５ａと平行になっている。当接面１７ｂは、電解質膜１１の厚さ方向において配置部５の配置面５ａよりも低くなる（電解質膜１１から離間する側）ように設定されている。 A plurality of flow path grooves 17 are formed in the reaction flow path portion 7 in order to widely diffuse the reaction gas in the reaction region. A plurality of contact surfaces 17b that come into contact with the main body 13 of the film electrode composite 4 are formed between the adjacent flow path grooves 17 and 17. The contact surfaces 17b are formed at the same height position, and are parallel to the arrangement surface 5a of the arrangement portion 5. The contact surface 17b is set to be lower than the arrangement surface 5a of the arrangement portion 5 in the thickness direction of the electrolyte membrane 11 (the side away from the electrolyte membrane 11).
　他方側セパレータ３は、本実施例では膜電極複合体４の上側に配置される板状部材である。他方側セパレータ３は、配置部８と、反応流路部１０とを有する。配置部８は、シール部材９が配置される部位であり、凸ビードが無く平坦に形成されている。配置部８は、膜電極複合体４に対向する面に形成されている。配置部８は、本実施例では平坦になっているが、配置部８の一部に溝等が形成されていてもよい。 The other side separator 3 is a plate-shaped member arranged on the upper side of the membrane electrode composite 4 in this embodiment. The other side separator 3 has an arrangement portion 8 and a reaction flow path portion 10. The arrangement portion 8 is a portion where the seal member 9 is arranged, and is formed flat without a convex bead. The arrangement portion 8 is formed on a surface facing the film electrode composite 4. Although the arrangement portion 8 is flat in this embodiment, a groove or the like may be formed in a part of the arrangement portion 8.
　シール部材９は、弾性材料で形成されており、本実施例では先端に向けて縮径するリップガスケットである。シール部材９の弾性材料はシール部材６と同じである。また、シール部材９と他方側セパレータ３との成形方法もシール部材６と同じである。シール部材９の形状は、反応ガスが遺漏しないようにシール可能であれば特に制限されない。 The seal member 9 is made of an elastic material, and in this embodiment, it is a lip gasket whose diameter is reduced toward the tip. The elastic material of the sealing member 9 is the same as that of the sealing member 6. Further, the molding method of the seal member 9 and the other side separator 3 is the same as that of the seal member 6. The shape of the sealing member 9 is not particularly limited as long as it can be sealed so that the reaction gas does not leak.
　反応流路部１０には、反応ガスを反応領域に広く拡散させるための複数の流路溝１８が形成されている。隣り合う流路溝１８，１８の間には、膜電極複合体４の本体部１３に当接する複数の当接面１８ｂが形成されている。当接面１８ｂは、それぞれ同じ高さ位置に形成されており、配置部８の配置面８ａと平行になっている。当接面１８ｂは、電解質膜１１の厚さ方向において配置部８の配置面８ａよりも低い位置（電解質膜１１に近接する側）となるように設定されている。また、流路溝１８の底面１８ａは、本実施例では、配置面８ａと当接面１８ｂの間に形成されている。 A plurality of flow path grooves 18 for widely diffusing the reaction gas into the reaction region are formed in the reaction flow path portion 10. A plurality of contact surfaces 18b that come into contact with the main body 13 of the film electrode composite 4 are formed between the adjacent flow path grooves 18 and 18. The contact surfaces 18b are formed at the same height position, and are parallel to the arrangement surface 8a of the arrangement portion 8. The contact surface 18b is set so as to be lower than the arrangement surface 8a of the arrangement portion 8 (the side close to the electrolyte membrane 11) in the thickness direction of the electrolyte membrane 11. Further, the bottom surface 18a of the flow path groove 18 is formed between the arrangement surface 8a and the contact surface 18b in this embodiment.
　膜電極複合体４の本体部１３の厚さは、張出部１４の厚さに対して十分に大きくなっている。張出部１４は、電解質膜１１又はフィルムで形成されている。 The thickness of the main body 13 of the film electrode composite 4 is sufficiently larger than the thickness of the overhanging portion 14. The overhanging portion 14 is formed of an electrolyte membrane 11 or a film.
　膜電極複合体４の本体部１３は、反応流路部７の当接面１７ｂと、反応流路部１０の当接面１８ｂとで挟持される。これにより、反応ガスの化学反応が促進される反応領域２１が形成される。また、膜電極複合体４の張出部１４は、シール部材６，９で挟持される。これにより、反応ガスがシールされるシール領域２２が形成される。張出部１４（電解質膜１１又はフィルム）の位置は、反応領域２１とシール領域２２との間で概ね同じ高さ位置になっている。つまり、張出部１４は、反応領域２１とシール領域２２との間で、一方側セパレータ２の配置部５と概ね平行になっている。 The main body 13 of the membrane electrode composite 4 is sandwiched between the contact surface 17b of the reaction flow path portion 7 and the contact surface 18b of the reaction flow path portion 10. As a result, a reaction region 21 is formed in which the chemical reaction of the reaction gas is promoted. Further, the overhanging portion 14 of the film electrode composite 4 is sandwiched between the sealing members 6 and 9. As a result, a sealing region 22 in which the reaction gas is sealed is formed. The position of the overhanging portion 14 (electrolyte film 11 or film) is substantially the same height between the reaction region 21 and the seal region 22. That is, the overhanging portion 14 is substantially parallel to the arranging portion 5 of the one-side separator 2 between the reaction region 21 and the seal region 22.
　図２に示すように、組付け前の一方側セパレータ２に配置されるシール部材６の厚さをｔ１とし、一方側セパレータ２に配置されるシール部材６のつぶし代をｔ１Cとする。また、一方側セパレータ２の反応流路部７の当接面１７ｂから一方側セパレータ２の配置部５の配置面５ａまでの高さをｔ２とする。 As shown in FIG. 2, the thickness of the seal member 6 arranged on the one-side separator 2 before assembly is t1, and the crushing allowance of the seal member 6 arranged on the one-side separator 2 is t1 C. Further, the height from the contact surface 17b of the reaction flow path portion 7 of the one-side separator 2 to the arrangement surface 5a of the arrangement portion 5 of the one-side separator 2 is defined as t2.
　また、一方側セパレータ２側に配置されたガス拡散層１２の組付け前の厚さ寸法をＴGDLとし、当該ガス拡散層１２のつぶし代寸法をＴCとする。また、流路溝１７の底面１７ａから当接面１７ｂまでの高さ寸法をｔ３とする。また、流路溝１７の底面１７ａから、配置部５の配置面５ａまでの高さ寸法をｔ４とする。このとき、本実施例では、下記の式（１）を満たすように各寸法が設定されている。 Further, the thickness dimension of the gas diffusion layer 12 arranged on the one-side separator 2 side before assembly is T GDL, and the crushing allowance dimension of the gas diffusion layer 12 is T C. Further, the height dimension from the bottom surface 17a of the flow path groove 17 to the contact surface 17b is t3. Further, the height dimension from the bottom surface 17a of the flow path groove 17 to the arrangement surface 5a of the arrangement portion 5 is t4. At this time, in this embodiment, each dimension is set so as to satisfy the following equation (1).
　（ｔ１－ｔ１C）＋ｔ２＝（ＴGDL－ＴC）　　　式（１） (T1-t1 C ) + t2 = ( TGDL - TC ) Equation (1)
　なお、張出部１４を平坦に設計することは困難であるため、反応ガスの化学反応が促進される範囲で下記の式（２）を満たすように各寸法を設定してもよい。 Since it is difficult to design the overhanging portion 14 to be flat, each dimension may be set so as to satisfy the following formula (2) within a range in which the chemical reaction of the reaction gas is promoted.
　（ｔ１－ｔ１C）＋ｔ２＝（ＴGDL－ＴC）×α　　　式（２）
　α＝０．８～１．２ (T1-t1 C ) + t2 = ( TGDL - TC ) × α equation (2)
α = 0.8-1.2
　また、他方側セパレータ３の流路溝１８の底面１８ａから当接面１８ｂまでの高さ寸法をｔ６とし、配置部８の配置面８ａから底面１８ａまでの高さ寸法をｔ７とし、配置部８の配置面８ａから当接面１８ｂまでの高さ寸法をｔ８とする。また、組付け前の他方側セパレータ３に配置されるシール部材９の厚さ寸法をｔ１０とし、他方側セパレータ３に配置されるシール部材９のつぶし代をｔ１０ｃとする。このとき、本実施例では下記の式（３）、式（４）を満たすように各寸法が設定されている。 Further, the height dimension from the bottom surface 18a of the flow path groove 18 of the other side separator 3 to the contact surface 18b is t6, and the height dimension from the arrangement surface 8a to the bottom surface 18a of the arrangement portion 8 is t7. The height dimension from the arrangement surface 8a to the contact surface 18b is t8. Further, the thickness dimension of the seal member 9 arranged on the other side separator 3 before assembly is t10, and the crushing allowance of the seal member 9 arranged on the other side separator 3 is t10c. At this time, in this embodiment, each dimension is set so as to satisfy the following equations (3) and (4).
　ｔ２≦ｔ４＜ｔ８　　　式（３）
　ｔ２＜ｔ７≦ｔ８　　　式（４） t2 ≤ t4 <t8 equation (3)
equation t2 <t7 ≤ t8 (4)
　前記した式（１）、式（２）、式（３）及び式（４）は、例示であって各部位の寸法は適宜設計が可能である。例えば、流路溝１７，１８の高さｔ３，ｔ６は、反応ガス（水素、酸素）及び冷却水の流動性やガス拡散層１２の圧縮率から適宜設定すればよい。 The above-mentioned equations (1), (2), (3) and (4) are examples, and the dimensions of each part can be appropriately designed. For example, the heights t3 and t6 of the flow path grooves 17 and 18 may be appropriately set from the fluidity of the reaction gas (hydrogen, oxygen) and cooling water and the compressibility of the gas diffusion layer 12.
　次に、本実施例に係る燃料電池セルの製造方法について説明する。本実施例に係る燃料電池セルの製造方法では、準備工程と、膜電極複合体配置工程と、他方側セパレータ配置工程と、圧縮工程とを行う。 Next, the method for manufacturing the fuel cell according to this embodiment will be described. In the method for manufacturing a fuel cell according to the present embodiment, a preparation step, a membrane electrode composite placement step, a separator placement step on the other side, and a compression step are performed.
　図２に示すように、準備工程は、前記した一方側セパレータ２、他方側セパレータ３及び膜電極複合体４を準備する工程である。図３に示すように、膜電極複合体配置工程は、一方側セパレータ２の上に、膜電極複合体４を配置する工程である。膜電極複合体配置工程では、膜電極複合体４の本体部１３を反応流路部７の当接面１７ｂに配置するとともに、張出部１４をシール部材６の当接面６ａに配置する。このとき、張出部１４（電解質膜１１又はフィルム）の高さ位置は概ね一定とすることができる。 As shown in FIG. 2, the preparation step is a step of preparing the one-side separator 2, the other-side separator 3, and the film electrode composite 4 described above. As shown in FIG. 3, the membrane electrode composite arranging step is a step of arranging the membrane electrode composite 4 on the one-side separator 2. In the membrane electrode composite arranging step, the main body 13 of the membrane electrode composite 4 is arranged on the contact surface 17b of the reaction flow path portion 7, and the overhanging portion 14 is arranged on the contact surface 6a of the seal member 6. At this time, the height position of the overhanging portion 14 (electrolyte film 11 or film) can be made substantially constant.
　他方側セパレータ配置工程は、膜電極複合体４の上に他方側セパレータ３を配置する工程である。他方側セパレータ配置工程では、膜電極複合体４の本体部１３の上に反応流路部１０の当接面１８ｂを当接させるとともに、シール部材９をシール部材６に対向させつつ張出部１４に当接させる。 The other side separator arranging step is a step of arranging the other side separator 3 on the membrane electrode composite 4. In the other-side separator arranging step, the contact surface 18b of the reaction flow path portion 10 is brought into contact with the main body portion 13 of the membrane electrode composite 4, and the overhanging portion 14 is made to face the seal member 6 while facing the seal member 9. Make contact with.
　圧縮工程は、組付けられた燃料電池セル１を複数個積層させ、所定のクリアランス又は荷重で一方側セパレータ２と他方側セパレータ３とを近接させる方向に力を付与して圧縮する。これにより、図１に示すように、シール部材６，９が収縮されるとともに、ガス拡散層１２，１２も収縮される。圧縮後、張出部１４（電解質膜１１又はフィルム）は、しわがなく、一方側セパレータ２の配置部５と概ね平行になっている。 In the compression step, a plurality of assembled fuel cell cells 1 are laminated, and a force is applied in a direction in which the one-side separator 2 and the other-side separator 3 are brought close to each other with a predetermined clearance or load to compress the fuel cells. As a result, as shown in FIG. 1, the sealing members 6 and 9 are contracted, and the gas diffusion layers 12 and 12 are also contracted. After compression, the overhanging portion 14 (electrolyte film 11 or film) is wrinkle-free and is substantially parallel to the arranging portion 5 of the one-side separator 2.
　次に、本実施例の作用効果について説明する。本実施例に係る燃料電池セル１及び燃料電池セルの製造方法では、図２に示すように、反応流路部７の当接面１７ｂが、一方側セパレータ２の配置部５の配置面５ａよりも低い位置（電解質膜１１から離間した位置）に設定されている。換言すると、シール部材６の当接面６ａと、流路溝１７の当接面１７ｂとで、膜電極複合体４のガス拡散層１２の厚さを吸収するための段差を設けている。これにより、膜電極複合体配置工程において、膜電極複合体４を一方側セパレータ２に配置した際、張出部１４のたわみを無くすか、小さくすることができる。換言すると、膜電極複合体配置工程において、一方側セパレータ２の配置部５と概ね平行となるように張出部１４を平坦に配置することができる。 Next, the action and effect of this example will be described. In the fuel cell 1 and the method for manufacturing the fuel cell according to the present embodiment, as shown in FIG. 2, the contact surface 17b of the reaction flow path portion 7 is from the arrangement surface 5a of the arrangement portion 5 of the one-side separator 2. Is also set at a low position (a position away from the electrolyte membrane 11). In other words, the contact surface 6a of the seal member 6 and the contact surface 17b of the flow path groove 17 are provided with a step for absorbing the thickness of the gas diffusion layer 12 of the membrane electrode composite 4. Thereby, in the process of arranging the film electrode composite, when the membrane electrode composite 4 is arranged on the one-side separator 2, the deflection of the overhanging portion 14 can be eliminated or reduced. In other words, in the film electrode composite arranging step, the overhanging portion 14 can be arranged flat so as to be substantially parallel to the arranging portion 5 of the one-side separator 2.
　図１０Ａ及び図１１Ａで示したように、組付け時に張出部１１２，２１２にたわみが発生していると圧縮時に張出部１１２，２１２にしわが発生やすくなるが、本実施例では、膜電極複合体配置工程でたわみを無くすか、小さくすることができるため、圧縮工程後の燃料電池セル１において、張出部１４のしわを無くすか、小さくすることができる。 As shown in FIGS. 10A and 11A, if the overhanging portions 112 and 212 are bent during assembly, the overhanging portions 112 and 212 are likely to be wrinkled during compression. However, in this embodiment, the membrane electrode is used. Since the deflection can be eliminated or reduced in the complex arrangement step, the wrinkles of the overhanging portion 14 can be eliminated or reduced in the fuel cell 1 after the compression step.
　ここで、例えば、図１０Ａの凸ビード１０８及び図１１Ａのシール部材２０４のように、セパレータ１０１，２０１側のつぶし代を大きく設定すると圧縮工程の際に張出部１１２，２１２の高さ方向（電解質膜の厚さ方向）の変位が大きくなり、しわの発生の要因となる。また、この形態であると、各部位の寸法設計、つぶし代の設計が困難になる。 Here, for example, as in the convex bead 108 of FIG. 10A and the seal member 204 of FIG. 11A, if the crushing allowance on the separators 101 and 201 side is set large, the height direction of the overhanging portions 112 and 212 during the compression step ( The displacement in the thickness direction of the electrolyte membrane becomes large, which causes wrinkles. Further, in this form, it becomes difficult to design the dimensions of each part and the crushing allowance.
　この点、本実施例によれば、シール領域２２における一方側セパレータ２のシール部材６のつぶし代ｔ１ｃ及び一方側セパレータ２のつぶし代（凸ビードが無いため実質ゼロ）の和を、他方側セパレータ３のシール部材９のつぶし代ｔ１０ｃ及び他方側セパレータ３のつぶし代（凸ビードが無いため実質ゼロ）の和よりも小さく設定している。 In this regard, according to the present embodiment, the sum of the crushing allowance t1c of the seal member 6 of the one-side separator 2 and the crushing allowance of the one-side separator 2 (substantially zero because there is no convex bead) in the seal region 22 is the sum of the crushing allowance t1c and the other-side separator. It is set to be smaller than the sum of the crushing allowance t10c of the seal member 9 of 3 and the crushing allowance of the other side separator 3 (substantially zero because there is no convex bead).
　つまり、圧縮工程において、一方側セパレータ２のシール部材６のつぶし代ｔ１ｃを、他方側セパレータ３のシール部材９のつぶし代ｔ１０ｃよりも小さく設定することにより、圧縮工程時のシール領域２２における張出部１４の高さ方向（電解質膜１１の厚さ方向）の変位を小さくすることができる。これにより、圧縮工程時においても、張出部１４のしわを無くすか、小さくすることができる。また、本実施例によれば、各部位の寸法設計、つぶし代の設計を容易に行うことができる。 That is, in the compression step, by setting the crushing allowance t1c of the seal member 6 of the one-side separator 2 to be smaller than the crushing allowance t10c of the seal member 9 of the other side separator 3, the overhang in the seal region 22 during the compression step is set. The displacement of the portion 14 in the height direction (the thickness direction of the electrolyte film 11) can be reduced. As a result, the wrinkles of the overhanging portion 14 can be eliminated or reduced even during the compression step. Further, according to this embodiment, it is possible to easily design the dimensions of each part and the crushing allowance.
　また、各部材の高さ寸法、厚さ寸法は適宜設定すればよいが、前記した式（１）のように条件を設定すれば、圧縮後の反応領域２１側の電解質膜１１の高さ位置と、シール領域２２側の張出部１４（電解質膜１１又はフィルム）の高さ位置を概ね同一にすることができる。これにより、張出部１４のしわを無くすか、より小さくすることができる。 Further, the height dimension and the thickness dimension of each member may be appropriately set, but if the conditions are set as in the above formula (1), the height position of the electrolyte membrane 11 on the reaction region 21 side after compression is set. And, the height position of the overhanging portion 14 (electrolyte film 11 or film) on the seal region 22 side can be made substantially the same. As a result, the wrinkles of the overhanging portion 14 can be eliminated or made smaller.
　また、他方側セパレータ３のシール部材９にリップガスケットを用いることで、配置部８を平坦にしつつ、反応流路部１０側との高さ位置を容易に調節することができる。 Further, by using a lip gasket for the seal member 9 of the other side separator 3, the height position with respect to the reaction flow path portion 10 side can be easily adjusted while flattening the arrangement portion 8.
　また、シール部材６の当接面６ａを平坦にすることで、各部材の組付け時に張出部１４にたわみが発生するのを防ぐことができ、ひいては張出部１４にしわが発生するのを防ぐことができる。また、平坦に形成されている一方側セパレータ２の配置部５の上に、膜電極複合体４を配置することで、簡単な作業で各部材の組付け時に張出部１４にたわみが発生するのを防ぐことができ、ひいては張出部１４にしわが発生するのを防ぐことができる。 Further, by flattening the contact surface 6a of the seal member 6, it is possible to prevent the overhanging portion 14 from being bent when assembling each member, and by extension, the overhanging portion 14 is prevented from being wrinkled. Can be prevented. Further, by arranging the film electrode composite 4 on the arrangement portion 5 of the one-side separator 2 which is formed flat, the overhanging portion 14 is bent at the time of assembling each member by a simple operation. It is possible to prevent wrinkles from being generated in the overhanging portion 14.
［変形例１］
　次に、実施例１の変形例１について説明する。図４は、実施例１の変形例１に係る燃料電池セルの要部分解断面図である。図５は、実施例１の変形例１に係る燃料電池セルの製造方法を示す要部断面図である。当該変形例１では、図４に示すように、一方側セパレータ２に受け部３１，３１が形成されている点で実施例１と相違する。変形例１では、実施例１と相違する部分を中心に説明する。 [Modification 1]
Next, a modification 1 of the first embodiment will be described. FIG. 4 is an exploded cross-sectional view of a main part of the fuel cell according to the first modification of the first embodiment. FIG. 5 is a cross-sectional view of a main part showing a method of manufacturing a fuel cell according to the first modification of the first embodiment. As shown in FIG. 4, the modification 1 is different from the first embodiment in that the receiving portions 31 and 31 are formed on the one-side separator 2. In the first modification, the parts different from the first embodiment will be mainly described.
　受け部３１は、一方側セパレータ２の配置部５において、シール部材６の両側に形成されている。受け部３１は、シール部材６の延長方向に対して断続的に形成されていてもよいし、連続的に形成されていてもよい。また、受け部３１は、シール部材６の片側のみに形成されていてもよい。 The receiving portion 31 is formed on both sides of the seal member 6 in the arranging portion 5 of the one-side separator 2. The receiving portion 31 may be formed intermittently or continuously with respect to the extension direction of the seal member 6. Further, the receiving portion 31 may be formed only on one side of the seal member 6.
　受け部３１の形状は、特に制限されないが、本変形例では先端に向けて縮径するように形成されている。受け部３１の高さ寸法は、組付け前においてシール部材６の厚さよりも大きくなるように設定されている。受け部３１の材料は特に制限されないが、例えば、シリコーンゴム（ＶＭＱ）、エチレンプロピレンジエンゴム（ＥＰＤＭ）、ポリイソブチレン（ＰＩＢ）、樹脂等を用いることができる。 The shape of the receiving portion 31 is not particularly limited, but in this modified example, it is formed so as to reduce the diameter toward the tip. The height dimension of the receiving portion 31 is set to be larger than the thickness of the seal member 6 before assembly. The material of the receiving portion 31 is not particularly limited, and for example, silicone rubber (VMQ), ethylene propylene diene rubber (EPDM), polyisobutylene (PIB), resin and the like can be used.
　図５に示すように、変形例１に係る膜電極複合体配置工程では、一方側セパレータ２の上に、膜電極複合体４を配置する。膜電極複合体４の本体部１３を反応流路部７の当接面１７ｂ，１７ｂに配置するとともに、張出部１４を受け部３１，３１の上に配置する。このとき、張出部１４は受け部３１，３１の先端に当接するが、シール部材６の当接面６ａとは離間している。離間寸法は適宜設定すればよいが、例えば、０．１ｍｍに設定する。なお、説明の便宜上、図５ではシール部材６の当接面６ａから張出部１４までの隙間を実際よりも大きく描画している。 As shown in FIG. 5, in the film electrode composite arranging step according to the first modification, the membrane electrode composite 4 is arranged on the one-side separator 2. The main body 13 of the membrane electrode composite 4 is arranged on the contact surfaces 17b and 17b of the reaction flow path 7, and the overhanging portion 14 is arranged on the receiving portions 31 and 31. At this time, the overhanging portion 14 comes into contact with the tips of the receiving portions 31 and 31, but is separated from the contact surface 6a of the seal member 6. The separation dimension may be set as appropriate, but is set to, for example, 0.1 mm. For convenience of explanation, in FIG. 5, the gap from the contact surface 6a of the seal member 6 to the overhanging portion 14 is drawn larger than the actual one.
　圧縮工程では、一方側セパレータ２と他方側セパレータ３とが互いに近接する方向に荷重が作用するため、前記した実施例１と同様に、張出部１４はシール部材６，９とそれぞれ接触し、挟持される。したがって、受け部３１は、当該シール機構に影響の無い材料、形状等に設定することが好ましい。 In the compression step, since the load acts in the direction in which the one-side separator 2 and the other-side separator 3 are close to each other, the overhanging portions 14 come into contact with the sealing members 6 and 9, respectively, as in the first embodiment. Be pinched. Therefore, it is preferable to set the receiving portion 31 to a material, shape, or the like that does not affect the sealing mechanism.
　ここで、シール部材６に粘着性（タック性）がある場合に、膜電極複合体配置工程及び他方側セパレータ配置工程を行うと、張出部１４とシール部材６とが貼り付いてしまい、作業時間が増大したり、たわみ、しわ等の原因になったりするおそれがある。 Here, when the sealing member 6 has adhesiveness (tackiness), if the film electrode composite arranging step and the other side separator arranging step are performed, the overhanging portion 14 and the sealing member 6 stick to each other, and the work It may increase the time and cause bending, wrinkles, etc.
　これに対し、変形例１によれば、一方側セパレータ２の配置部５に受け部３１，３１を有しているため、圧縮工程を行う前に、張出部１４とシール部材６とが貼り付くのを防ぐことができる。これにより、シール部材６のタック性が高い場合でも張出部１４がシール部材６に貼り付きにくく、組付けが容易となり、作業時間を短縮することができる。さらに、たわみがある状態でシール部材６に張出部１４が貼り付くことを防ぐことができる。また、受け部３１が、低タック性の材料であればより作業性を高めることができる。 On the other hand, according to the modified example 1, since the receiving portions 31 and 31 are provided in the arranging portion 5 of the one-side separator 2, the overhanging portion 14 and the sealing member 6 are attached to each other before the compression step is performed. It can be prevented from sticking. As a result, even when the seal member 6 has a high tack property, the overhanging portion 14 is difficult to stick to the seal member 6, the assembly becomes easy, and the working time can be shortened. Further, it is possible to prevent the overhanging portion 14 from sticking to the seal member 6 in a state of being bent. Further, if the receiving portion 31 is made of a material having low tackiness, workability can be further improved.
［変形例２］
　図６は、実施例１の変形例２に係る燃料電池セルの製造方法を示す要部断面図である。図６に示すように、受け部３１，３１は、張出部１４（電解質膜１１又はフィルム）に設けてもよい。 [Modification 2]
FIG. 6 is a cross-sectional view of a main part showing a method of manufacturing a fuel cell according to the second modification of the first embodiment. As shown in FIG. 6, the receiving portions 31 and 31 may be provided on the overhanging portion 14 (electrolyte film 11 or film).
　変形例２に係る受け部３１，３１は、張出部１４のうち一方側セパレータ２に対向する面に形成されている。受け部３１，３１は、張出部１４において、シール部材６の両側に配置されるように形成されている。受け部３１は、シール部材６の延長方向に対して断続的に形成されていてもよいし、連続的に形成されていてもよい。また、受け部３１は、シール部材６の片側のみに配置されるように形成してもよい。 The receiving portions 31 and 31 according to the modified example 2 are formed on the surface of the overhanging portion 14 facing the one-side separator 2. The receiving portions 31 and 31 are formed so as to be arranged on both sides of the seal member 6 in the overhanging portion 14. The receiving portion 31 may be formed intermittently or continuously with respect to the extension direction of the seal member 6. Further, the receiving portion 31 may be formed so as to be arranged only on one side of the seal member 6.
　膜電極複合体配置工程では、図６に示すように、一方側セパレータ２の上に膜電極複合体４を配置する。膜電極複合体４の本体部１３を反応流路部７の当接面１７ｂ，１７ｂに配置するとともに、受け部３１，３１の先端を一方側セパレータ２の配置部５に当接させる。このとき、張出部１４とシール部材６とは離間している。変形例２のように、受け部３１，３１は、張出部１４に設けてもよい。変形例２の構成であっても、変形例１と同等の効果を奏することができる。 In the membrane electrode composite placement step, the membrane electrode composite 4 is placed on the one-side separator 2 as shown in FIG. The main body 13 of the membrane electrode composite 4 is arranged on the contact surfaces 17b and 17b of the reaction flow path portion 7, and the tips of the receiving portions 31 and 31 are brought into contact with the arrangement portion 5 of the one-side separator 2. At this time, the overhanging portion 14 and the seal member 6 are separated from each other. As in the second modification, the receiving portions 31 and 31 may be provided in the overhanging portion 14. Even with the configuration of the modified example 2, the same effect as that of the modified example 1 can be obtained.
［実施例２］
　次に、実施例２に係る燃料電池セル及び燃料電池セルの製造方法について説明する。図７は、実施例２に係る燃料電池セルを示す要部断面図である。実施例２に係る燃料電池セル１Ａは、図７に示すように、他方側セパレータ３Ａに凸ビード４１を設けている点と、シール部材４２を用いている点で主に相違する。実施例２では実施例１と相違する部分を中心に説明する。 [Example 2]
Next, the fuel cell and the method for manufacturing the fuel cell according to the second embodiment will be described. FIG. 7 is a cross-sectional view of a main part showing the fuel cell according to the second embodiment. As shown in FIG. 7, the fuel cell 1A according to the second embodiment is mainly different in that the convex bead 41 is provided on the other side separator 3A and that the seal member 42 is used. In the second embodiment, the parts different from the first embodiment will be mainly described.
　図７に示すように、一方側セパレータ２及び膜電極複合体４は、実施例１と同一である。他方側セパレータ３Ａは、凸ビード４１と、シール部材４２と、反応流路部１０とを備えている。凸ビード４１は、一方側セパレータ２側に向けて突出する部位である。凸ビード４１の先端には、シール部材４２を配置する平坦な配置部４３が形成されている。 As shown in FIG. 7, the one-side separator 2 and the film electrode composite 4 are the same as those in the first embodiment. The other side separator 3A includes a convex bead 41, a sealing member 42, and a reaction flow path portion 10. The convex bead 41 is a portion that protrudes toward the one-side separator 2 side. At the tip of the convex bead 41, a flat arrangement portion 43 for arranging the seal member 42 is formed.
　シール部材４２は、配置部４３に設けられている。シール部材４２は、本実施例では断面矩形のフラットガスケットを用いている。 The seal member 42 is provided in the arrangement portion 43. In this embodiment, the sealing member 42 uses a flat gasket having a rectangular cross section.
　図８は、実施例２に係る燃料電池セルを示す要部分解断面図である。図８に示すように、各部材の寸法及び条件は、実施例１と概ね同一である。なお、組付け前の凸ビード４１の高さ寸法をｔ１１とし、凸ビード４１のつぶし代をｔ１１ｃとする。また、組付け前の他方側セパレータ３Ａに配置されるシール部材４２の厚さ寸法をｔ１２とし、シール部材４２のつぶし代をｔ１２ｃとする。 FIG. 8 is an exploded cross-sectional view of a main part showing the fuel cell according to the second embodiment. As shown in FIG. 8, the dimensions and conditions of each member are substantially the same as those in the first embodiment. The height dimension of the convex bead 41 before assembly is t11, and the crushing allowance of the convex bead 41 is t11c. Further, the thickness dimension of the seal member 42 arranged on the other side separator 3A before assembly is t12, and the crushing allowance of the seal member 42 is t12c.
　次に、実施例２に係る燃料電池セルの製造方法について説明する。当該実施例２では、準備工工程と、膜電極複合体配置工程と、他方側セパレータ配置工程と、圧縮工程とを行う。準備工程では、一方側セパレータ２、他方側セパレータ３Ａ及び膜電極複合体４を準備する。 Next, the method for manufacturing the fuel cell according to the second embodiment will be described. In the second embodiment, the preparatory work step, the membrane electrode composite placement step, the other side separator placement step, and the compression step are performed. In the preparation step, the one-side separator 2, the other-side separator 3A, and the film electrode composite 4 are prepared.
　図９は、実施例２に係る燃料電池セルの製造方法を示す要部断面図である。図９に示すように、膜電極複合体配置工程では、実施例１と同じ要領で一方側セパレータ２の上に膜電極複合体４を配置する。他方側セパレータ配置工程では、膜電極複合体４の上に他方側セパレータ３Ａを配置する。他方側セパレータ配置工程では、反応流路部７，１０の間に膜電極複合体４の本体部１３を挟持して反応領域２１を形成するとともに、シール部材６，４２で張出部１４を挟持してシール領域２２を形成する。 FIG. 9 is a cross-sectional view of a main part showing a method of manufacturing a fuel cell according to the second embodiment. As shown in FIG. 9, in the film electrode composite arrangement step, the film electrode composite 4 is arranged on the one-side separator 2 in the same manner as in the first embodiment. In the other-side separator arranging step, the other-side separator 3A is arranged on the membrane electrode composite 4. In the process of arranging the separator on the other side, the main body 13 of the membrane electrode composite 4 is sandwiched between the reaction flow paths 7 and 10 to form the reaction region 21, and the overhanging portions 14 are sandwiched between the sealing members 6 and 42. To form the seal region 22.
　圧縮工程では、図７に示すように、一方側セパレータ２と他方側セパレータ３Ａとが近接する方向に圧縮する。これにより、シール部材６，４２が圧縮されるとともに、凸ビード４１及びガス拡散層１２，１２も圧縮される。張出部１４は、一方側セパレータ２の配置部５と概ね平行になっている。 In the compression step, as shown in FIG. 7, the one-side separator 2 and the other-side separator 3A are compressed in a direction in which they are close to each other. As a result, the sealing members 6 and 42 are compressed, and the convex beads 41 and the gas diffusion layers 12 and 12 are also compressed. The overhanging portion 14 is substantially parallel to the arranging portion 5 of the one-side separator 2.
　このように、実施例２に係る燃料電池セル及び燃料電池セルの製造方法によっても、実施例１と略同等の効果を奏することができる。また、他方側セパレータ３Ａに凸ビード４１を設け、当該凸ビード４１にシール部材４２を設けることで、反応流路部１０側との高さ位置を容易に調節することができる。 As described above, the fuel cell and the method for manufacturing the fuel cell according to the second embodiment can also achieve substantially the same effect as that of the first embodiment. Further, by providing the convex bead 41 on the other side separator 3A and providing the sealing member 42 on the convex bead 41, the height position with respect to the reaction flow path portion 10 side can be easily adjusted.
　また、シール領域２２における一方側セパレータ２のシール部材６のつぶし代ｔ１ｃ及び一方側セパレータ２のつぶし代（凸ビードが無いため実質ゼロ）の和を、他方側セパレータ３Ａの凸ビード４１のつぶし代ｔ１１ｃ及びシール部材４２のつぶし代ｔ１２ｃの和よりも小さく設定している（ｔ１ｃ＜（ｔ１１ｃ＋ｔ１２ｃ））。 Further, the sum of the crushing allowance t1c of the seal member 6 of the one-side separator 2 and the crushing allowance of the one-side separator 2 (substantially zero because there is no convex bead) in the seal region 22 is the crushing allowance of the convex bead 41 of the other-side separator 3A. It is set smaller than the sum of t11c and the crushing allowance t12c of the seal member 42 (t1c <(t11c + t12c)).
　つまり、圧縮工程において、一方側セパレータ２のシール部材６のつぶし代ｔ１ｃを他方側セパレータ３Ａの凸ビード４１のつぶし代ｔ１１ｃ及びシール部材４２のつぶし代ｔ１２ｃの和よりも小さく設定することにより、圧縮工程時のシール領域２２における張出部１４の高さ方向（電解質膜１１の厚さ方向）の変位を小さくすることができる。これにより、圧縮工程時においても、張出部１４のしわを無くすか、小さくことができる。また、本実施例によれば、各部位の寸法設計、つぶし代の設計を容易に行うことができる。 That is, in the compression step, the crushing allowance t1c of the seal member 6 of the one-side separator 2 is set to be smaller than the sum of the crushing allowance t11c of the convex bead 41 of the other-side separator 3A and the crushing allowance t12c of the seal member 42, thereby compressing. The displacement of the overhanging portion 14 in the sealing region 22 during the process in the height direction (thickness direction of the electrolyte film 11) can be reduced. As a result, the wrinkles of the overhanging portion 14 can be eliminated or reduced even during the compression step. Further, according to this embodiment, it is possible to easily design the dimensions of each part and the crushing allowance.
　以上本発明の実施例を説明したが、前記した構成に限定されることなく適宜設計変形が可能である。例えば、実施例２の形態でも受け部３１を設けることもできる。 Although the embodiments of the present invention have been described above, the design can be appropriately modified without being limited to the above-described configuration. For example, the receiving portion 31 can also be provided in the embodiment of the second embodiment.
　１　　　　燃料電池セル
　２　　　　一方側セパレータ
　３　　　　他方側セパレータ
　４　　　　膜電極複合体
　５　　　　配置部
　６　　　　シール部材
　７　　　　反応流路部
　８　　　　配置部
　９　　　　シール部材
　１０　　　反応流路部
　１１　　　電解質膜
　１２　　　ガス拡散層
　１３　　　本体部
　１４　　　張出部
　１７ｂ　　当接面
　１８ｂ　　当接面
　３１　　　受け部 1 Fuel cell 2 One-side separator 3 The other-side separator 4 Membrane electrode composite 5 Arrangement part 6 Seal member 7 Reaction flow path part 8 Arrangement part 9 Seal member 10 Reaction flow path part 11 Electrolyte membrane 12 Gas diffusion layer 13 Main body part 14 Overhanging part 17b Contact surface 18b Contact surface 31 Receiving part

Claims (6)

  1. 　平坦に形成された配置部に配置されたシール部材及び反応ガスが流通する反応流路部を備えた一方側セパレータと、
    　配置部に配置されたシール部材及び反応ガスが流通する反応流路部を備えた他方側セパレータと、
    　前記一方側セパレータと前記他方側セパレータとの間にそれぞれ前記シール部材を介して配置された膜電極複合体と、を有し、
    　前記膜電極複合体の本体部が反応流路部同士に挟持されることにより反応領域が形成されているとともに、前記本体部から張り出した電解質膜又はフィルムが前記シール部材同士に挟持されることによりシール領域が形成され、
    　前記一方側セパレータの前記反応流路部のうち前記膜電極複合体の前記本体部が当接する当接面は、前記一方側セパレータの前記配置部の配置面よりも前記膜電極複合体から離間する側に設定されていることを特徴とする燃料電池セル。     A one-sided separator provided with a seal member arranged in a flatly formed arrangement portion and a reaction flow path portion through which the reaction gas flows,
    A seal member arranged in the arrangement portion and a separator on the other side provided with a reaction flow path portion through which the reaction gas flows,
    It has a film electrode composite disposed between the one-side separator and the other-side separator via the sealing member, respectively.
    The reaction region is formed by sandwiching the main body of the membrane electrode composite between the reaction flow paths, and the electrolyte membrane or film protruding from the main body is sandwiched between the sealing members. A sealing area is formed,
    Of the reaction flow path portion of the one-side separator, the contact surface with which the main body portion of the membrane electrode composite abuts is separated from the membrane electrode composite by the arrangement surface of the arrangement portion of the one-side separator. A fuel cell that is characterized by being set on the side.
  2. 　前記シール領域における前記一方側セパレータの前記シール部材のつぶし代及び前記一方側セパレータのつぶし代の和は、前記他方側セパレータに配置されるシール部材のつぶし代及び前記他方側セパレータのつぶし代の和よりも小さいことを特徴とする請求項１に記載の燃料電池セル。 The sum of the crushing allowance of the sealing member of the one-sided separator and the crushing allowance of the one-sided separator in the sealing region is the sum of the crushing allowance of the sealing member arranged on the other-side separator and the crushing allowance of the other-side separator. The fuel cell according to claim 1, wherein the fuel cell is smaller than.
  3. 　前記一方側セパレータに設けられた前記シール部材の幅方向の一方側又は両側に受け部を有し、
    　組付け前の前記受け部の高さは、前記一方側セパレータに配置される前記シール部材の厚さよりも大きくなっていることを特徴とする請求項１又は請求項２に記載の燃料電池セル。     The sealing member provided on the one-side separator has receiving portions on one side or both sides in the width direction.
    The fuel cell according to claim 1 or 2, wherein the height of the receiving portion before assembly is larger than the thickness of the sealing member arranged on the one-side separator.
  4. 　前記膜電極複合体の本体部から張り出した前記電解質膜又はフィルムに形成された受け部を有し、
    　前記受け部は、前記一方側セパレータに配置される前記シール部材の幅方向の一方側又は両側に配置され、
    　組付け前の前記受け部の高さは、前記一方側セパレータに配置される前記シール部材の厚さよりも大きくなっていることを特徴とする請求項１又は請求項２に記載の燃料電池セル。     It has a receiving portion formed on the electrolyte membrane or the film overhanging from the main body portion of the membrane electrode composite.
    The receiving portion is arranged on one side or both sides in the width direction of the sealing member arranged on the one side separator.
    The fuel cell according to claim 1 or 2, wherein the height of the receiving portion before assembly is larger than the thickness of the sealing member arranged on the one-side separator.
  5. 　平坦に形成された配置部に配置されたシール部材及び反応ガスが流通する反応流路部を備えた一方側セパレータと、配置部に配置されたシール部材及び反応ガスが流通する反応流路部を備えた他方側セパレータと、膜電極複合体と、を準備する準備工程と、
    　前記一方側セパレータの上に前記膜電極複合体を配置し、前記膜電極複合体の本体部を前記一方側セパレータの前記反応流路部の上に配置するとともに、前記本体部から張り出した電解質膜又はフィルムを前記一方側セパレータの前記シール部材の上に配置する膜電極複合体配置工程と、
    　前記膜電極複合体の上に前記他方側セパレータを配置し、前記反応流路部同士で前記膜電極複合体の本体部を挟持して反応領域を形成するとともに、前記シール部材同士で前記電解質膜又はフィルムを挟持してシール領域を形成する他方側セパレータ配置工程と、
    　前記一方側セパレータと前記他方側セパレータとを近接させる方向に力を付与する圧縮工程と、を含み、
    　前記一方側セパレータの前記反応流路部のうち前記膜電極複合体の前記本体部が当接する当接面を、前記一方側セパレータの前記配置部の配置面よりも前記膜電極複合体から離間する側に設定することを特徴とする燃料電池セルの製造方法。     A one-sided separator having a seal member arranged in a flatly formed arrangement portion and a reaction flow path portion through which the reaction gas flows, and a seal member arranged in the arrangement portion and a reaction flow path portion through which the reaction gas flows. A preparatory step for preparing the provided other side separator and the membrane electrode composite,
    The membrane electrode composite is placed on the one-side separator, the main body of the membrane electrode composite is placed on the reaction flow path of the one-side separator, and the electrolyte membrane overhangs from the main body. Alternatively, a film electrode composite arranging step of arranging the film on the sealing member of the one-side separator, and
    The other side separator is arranged on the membrane electrode composite, the main body portion of the membrane electrode composite is sandwiched between the reaction flow paths, and a reaction region is formed, and the electrolyte membrane is formed between the sealing members. Alternatively, the other side separator placement step of sandwiching the film to form a seal region and
    A compression step of applying a force in a direction in which the one-side separator and the other-side separator are brought close to each other is included.
    Of the reaction flow path portion of the one-side separator, the contact surface with which the main body portion of the membrane electrode composite abuts is separated from the membrane electrode composite with the arrangement surface of the arrangement portion of the one-side separator. A method of manufacturing a fuel cell, which comprises setting it on the side.
  6. 　前記シール領域における前記一方側セパレータの前記シール部材のつぶし代及び前記一方側セパレータのつぶし代の和を、前記他方側セパレータに配置されるシール部材のつぶし代及び前記他方側セパレータのつぶし代の和よりも小さく設定することを特徴とする請求項５に記載の燃料電池セルの製造方法。 The sum of the crushing allowance of the sealing member of the one-sided separator and the crushing allowance of the one-sided separator in the sealing region is the sum of the crushing allowance of the sealing member arranged on the other-side separator and the crushing allowance of the other-side separator. The method for manufacturing a fuel cell according to claim 5, wherein the fuel cell is set smaller than the above.
PCT/JP2020/024777 2019-07-30 2020-06-24 Fuel cell and method for manufacturing fuel cell WO2021019974A1 (en)

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JPH0615402Y2 (en) * 1986-08-08 1994-04-20 石川島播磨重工業株式会社 Fuel cell
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