JP2019164958A - Manufacturing method of fuel cell stack and dummy cell - Google Patents

Manufacturing method of fuel cell stack and dummy cell Download PDF

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JP2019164958A
JP2019164958A JP2018053297A JP2018053297A JP2019164958A JP 2019164958 A JP2019164958 A JP 2019164958A JP 2018053297 A JP2018053297 A JP 2018053297A JP 2018053297 A JP2018053297 A JP 2018053297A JP 2019164958 A JP2019164958 A JP 2019164958A
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dummy
conductive porous
porous body
frame member
resin frame
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JP6633114B2 (en
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井上　大輔
Daisuke Inoue
大輔 井上
智史 青木
Tomoji Aoki
智史 青木
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Honda Motor Co Ltd
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    • 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

Abstract

To provide a manufacturing method of a fuel cell stack and a dummy cell capable of improving power generation stability by a dummy cell obtained efficiency and at high quality by simple steps.SOLUTION: A fuel cell stack 10 includes at least a laminate 14 obtained by laminating a plurality of power generation cells 12 each having an electrolyte film/electrode structure 80 and a first dummy cell 18 arranged on the one-end side of the laminate 14 in a lamination direction. The first dummy cell 18 includes a dummy structure 110 corresponding to the electrolyte film/electrode structure 80 and dummy resin frame member 111 joined to the dummy structure 110 through second junction portions 120. The second junction portions 120 are intermittently formed in a peripheral direction of an outer periphery of a third conductive porous body 116 of the dummy structure 110 and includes corner junction sections 120a formed on corner portions of a third conductive porous body 116 and adjacent junction portions 120b formed on positions adjacent to the corner junction portions 120a of long sides 117a of the third conductive porous body 116.SELECTED DRAWING: Figure 9

Description

本発明は、電解質膜・電極構造体と、電解質膜・電極構造体の外周を周回する樹脂枠部材と、セパレータとを有する発電セルを複数積層した積層体、及び積層体の積層方向の少なくとも一方の端部に配設されるダミーセル備える燃料電池スタック及びダミーセルの製造方法に関する。   The present invention relates to a laminate in which a plurality of power generation cells having an electrolyte membrane / electrode structure, a resin frame member that circulates around the outer periphery of the electrolyte membrane / electrode structure, and a separator, and at least one of the lamination directions of the laminate The present invention relates to a fuel cell stack provided with a dummy cell disposed at an end of the battery and a method for manufacturing the dummy cell.

一般的に、固体高分子型燃料電池は、高分子イオン交換膜からなる固体高分子電解質膜（以下、単に電解質膜ともいう）を採用している。燃料電池は、電解質膜の一方の面にアノード電極が配設され、他方の面にカソード電極が配設された電解質膜・電極構造体（ＭＥＡ）を備えている。   In general, a solid polymer fuel cell employs a solid polymer electrolyte membrane (hereinafter also simply referred to as an electrolyte membrane) made of a polymer ion exchange membrane. The fuel cell includes an electrolyte membrane / electrode structure (MEA) in which an anode electrode is disposed on one surface of an electrolyte membrane and a cathode electrode is disposed on the other surface.

電解質膜・電極構造体をセパレータで挟持することにより、発電セルが構成され、複数個の発電セルを積層することにより、積層体が構成される。この積層体の積層方向両端に、各発電セルによって発電された電荷を集める電力取り出し用のターミナルプレートや、発電セルを積層状態で保持するためのエンドプレート等が設けられて燃料電池スタックが構成される。   A power generation cell is configured by sandwiching the electrolyte membrane / electrode structure with a separator, and a stacked body is configured by stacking a plurality of power generation cells. A fuel cell stack is configured by providing a power extraction terminal plate that collects the electric power generated by each power generation cell, an end plate for holding the power generation cells in a stacked state, and the like at both ends in the stacking direction of the stack. The

ところで、積層体の積層方向の端部側（以下、単に端部側ともいう）は、ターミナルプレート等を介した放熱が促されること等から、該積層体の積層方向の中央側に比べ低温となり易い。外気温等の影響を受けて積層体の端部側が低温となり結露が生じると、反応ガスの拡散性が低下し、燃料電池スタックの発電安定性が低下する懸念がある。   By the way, the end side in the stacking direction of the laminated body (hereinafter also simply referred to as the end side) has a lower temperature than the central side of the laminated body in the stacking direction because heat dissipation is promoted through the terminal plate and the like. easy. If the end side of the laminate becomes low temperature due to the influence of the outside air temperature or the like and condensation occurs, there is a concern that the diffusibility of the reaction gas is lowered and the power generation stability of the fuel cell stack is lowered.

そこで、例えば、特許文献１に開示されている燃料電池スタックでは、積層体の積層方向の少なくとも一方の端部側に、いわゆる、ダミーセルが配設されている。ダミーセルでは、電解質膜の代わりに金属板を用いていることから、発電を行わず、生成水も生じない。このため、ダミーセル自体が、ターミナルプレートと積層体との間で、断熱層として機能する。従って、上記のようにダミーセルを配設することで、積層体の端部側の温度低下を抑制できる。つまり、燃料電池スタックが外気温の影響を受けることを抑制して、発電安定性を向上させることができる。   Therefore, for example, in the fuel cell stack disclosed in Patent Document 1, a so-called dummy cell is disposed on at least one end side in the stacking direction of the stack. In the dummy cell, since a metal plate is used instead of the electrolyte membrane, no power is generated and no generated water is generated. For this reason, the dummy cell itself functions as a heat insulating layer between the terminal plate and the laminated body. Therefore, by arranging the dummy cells as described above, it is possible to suppress a temperature decrease on the end side of the stacked body. That is, it is possible to improve the power generation stability by suppressing the fuel cell stack from being affected by the outside air temperature.

特許第４７２７９７２号公報Japanese Patent No. 4727972

本発明は、この種の技術に関連してなされたものであり、簡素な工程で効率的且つ高品質に得られるダミーセルにより、発電安定性を向上させることが可能な燃料電池スタック及びダミーセルの製造方法を提供することを目的とする。   The present invention has been made in connection with this kind of technology, and manufacturing a fuel cell stack and a dummy cell capable of improving power generation stability by a dummy cell obtained efficiently and with high quality by a simple process. It aims to provide a method.

上記の目的を達成するため、本発明は、電解質膜の両側に導電性多孔質体からなるガス拡散層を有する電極がそれぞれ配設された電解質膜・電極構造体と、電解質膜・電極構造体の外周を周回する樹脂枠部材と、電解質膜・電極構造体を挟むセパレータとを有する発電セルを複数積層した積層体、及び積層体の積層方向の少なくとも一方の端部に配設されるダミーセルを備える燃料電池スタックであって、ダミーセルは、電解質膜・電極構造体に対応し且つ矩形状の平面寸法がそれぞれ異なる３枚の導電性多孔質体を積層して形成されるダミー構造体と、ダミー構造体の外周を周回するダミー樹脂枠部材と、ダミー構造体を挟むダミーセパレータと、を備え、ダミー樹脂枠部材と少なくとも１枚の導電性多孔質体とは、該導電性多孔質体に接着樹脂を含浸させた含浸接合部が、導電性多孔質体の外周の周方向に断続的に設けられることで接合され、含浸接合部は、導電性多孔質体の角部に設けられる角接合部と、導電性多孔質体の長辺の角接合部に近接する位置に設けられる近接接合部と、を有することを特徴とする。   In order to achieve the above object, the present invention provides an electrolyte membrane / electrode structure in which electrodes each having a gas diffusion layer made of a conductive porous body are disposed on both sides of an electrolyte membrane, and an electrolyte membrane / electrode structure. A laminated body in which a plurality of power generation cells having a resin frame member that circulates around the outer periphery of the substrate and a separator that sandwiches the electrolyte membrane / electrode structure, and a dummy cell disposed at at least one end in the stacking direction of the laminated body The dummy cell includes a dummy structure formed by stacking three conductive porous bodies corresponding to the electrolyte membrane / electrode structure and having different rectangular planar dimensions, and a dummy cell. A dummy resin frame member that circulates around the outer periphery of the structure and a dummy separator that sandwiches the dummy structure, and the dummy resin frame member and at least one conductive porous body are in contact with the conductive porous body. The impregnated joint impregnated with resin is joined by being intermittently provided in the circumferential direction of the outer periphery of the conductive porous body, and the impregnated joint is provided at the corner of the conductive porous body. And a proximity joint provided at a position close to the corner joint on the long side of the conductive porous body.

この燃料電池スタックでは、積層体の積層方向の少なくとも一方の端部に、発電セルの電解質膜・電極構造体に代えて、ダミー構造体を備えるダミーセルが配設される。このダミーセルは、固体高分子電解質膜や電極触媒層を備えていないため、発電を行うことがなく、発電による生成水も生じない。これによって、ダミーセル自体が断熱層として機能するとともに、ダミーセルで結露が生じることを抑制できる。このようなダミーセルを、積層体の積層方向の少なくとも一方の端部側に設けることで、積層体の端部側の断熱性を高めることができる。このため、低温環境下においても、積層体の端部側の温度が中央側に比して低温となることを抑制できる。つまり、発電安定性を向上させることができる。   In this fuel cell stack, a dummy cell provided with a dummy structure is disposed at at least one end in the stacking direction of the stack instead of the electrolyte membrane / electrode structure of the power generation cell. Since this dummy cell does not include a solid polymer electrolyte membrane or an electrode catalyst layer, power generation is not performed, and water generated by power generation is not generated. As a result, the dummy cell itself functions as a heat insulating layer, and it is possible to suppress dew condensation in the dummy cell. By providing such a dummy cell on at least one end side in the stacking direction of the stacked body, the heat insulation on the end side of the stacked body can be enhanced. For this reason, it can suppress that the temperature of the edge part side of a laminated body becomes low temperature compared with the center side also in a low temperature environment. That is, power generation stability can be improved.

さらに、積層体の端部側の断熱性を高めることができるため、燃料電池スタックを氷点下環境で始動する場合であっても、積層体の全体を有効に昇温させることができる。これによって、積層体の端部側で生成水等が凍結して、電圧低下が生じることを抑制できる。   Furthermore, since the heat insulating property on the end side of the stacked body can be improved, even when the fuel cell stack is started in a sub-freezing environment, the entire stacked body can be effectively heated. As a result, it is possible to suppress the generation of water or the like from freezing on the end side of the laminate and causing a voltage drop.

上記のように、発電を行わないダミーセルでは、クロスリーク等を抑制する必要がない。このため、ダミー構造体の少なくとも１枚の導電性多孔質体の外周の周方向に断続的に含浸接合部を設けることでダミー構造体とダミー樹脂枠部材との接合工程を簡素化して、効率的にダミーセルを得ることが可能になる。   As described above, in a dummy cell that does not generate power, there is no need to suppress cross leakage or the like. For this reason, it is possible to simplify the joining process between the dummy structure and the dummy resin frame member by providing the impregnated joints intermittently in the circumferential direction of the outer periphery of at least one conductive porous body of the dummy structure. Thus, it becomes possible to obtain dummy cells.

このように、接合工程を簡素化しても、該含浸接合部が角接合部と近接接合部とを有することで、ダミー樹脂枠部材とダミー構造体との接合強度を十分な大きさとすることができる。また、含浸接合部が導電性多孔質体に接着樹脂を含浸させて形成されるため、例えば、ダミー樹脂枠部材と導電性多孔質体の間にのみ接着剤を介在させる場合に比して、ダミー樹脂枠部材とダミー構造体とを高強度に接合することができる。これらによって、ダミーセルの高品質化を図ることができる。   As described above, even if the joining process is simplified, the impregnated joining portion has the corner joining portion and the proximity joining portion, so that the joining strength between the dummy resin frame member and the dummy structure can be sufficiently large. it can. Further, since the impregnated joint is formed by impregnating the conductive porous body with the adhesive resin, for example, compared to the case where the adhesive is interposed only between the dummy resin frame member and the conductive porous body, The dummy resin frame member and the dummy structure can be bonded with high strength. As a result, the quality of the dummy cell can be improved.

また、含浸接合部を形成するべく、加熱により溶融した接着樹脂を導電性多孔質体に含浸させる際、該含浸接合部の周囲のダミー樹脂枠部材も比較的高温となる。上記のように断続的に含浸接合部を設けることで、例えば、導電性多孔質体を周回するように含浸接合部を設ける場合に比して、ダミー樹脂枠部材の高温となる部分を縮小できる。その結果、ダミー樹脂枠部材に加熱による反り等が生じることを抑制できるため、これによってもダミーセルを高品質に得ることができる。   Further, when the conductive porous body is impregnated with the adhesive resin melted by heating in order to form the impregnated joint portion, the dummy resin frame member around the impregnated joint portion also has a relatively high temperature. By providing the impregnated joints intermittently as described above, for example, compared to the case where the impregnated joints are provided so as to circulate around the conductive porous body, the portion of the dummy resin frame member that is at a high temperature can be reduced. . As a result, the dummy resin frame member can be prevented from warping due to heating and the like, so that the dummy cell can be obtained with high quality.

以上から、この燃料電池スタックによれば、簡素な工程で効率的且つ高品質に得られるダミーセルにより発電安定性を向上させることができる。   As described above, according to this fuel cell stack, the power generation stability can be improved by the dummy cells that can be obtained efficiently and with high quality in a simple process.

上記の燃料電池スタックにおいて、含浸接合部は、導電性多孔質体の長辺の角接合部同士の間を複数の長辺区間に分割する位置に設けられる長辺接合部と、導電性多孔質体の短辺の角接合部同士の間を複数の短辺区間に分割する位置に設けられる短辺接合部と、をさらに有し、長辺区間のそれぞれの長さは、短辺区間のそれぞれの長さよりも大きいことが好ましい。この場合、ダミー構造体とダミー樹脂枠部材とを効率的に接合すること及び接合強度を高めることの両立を良好に図ることが可能になる。   In the fuel cell stack, the impregnated joint includes a long side joint provided at a position where the long side corner joints of the conductive porous body are divided into a plurality of long side sections, and the conductive porous body. A short side joint provided at a position to divide the short side corner joints of the body into a plurality of short side sections, and each length of the long side section is each of the short side sections It is preferable that it is larger than this length. In this case, it is possible to satisfactorily achieve both the efficient joining of the dummy structure and the dummy resin frame member and the enhancement of the joining strength.

上記の燃料電池スタックにおいて、長辺区間の長さは互いに等しく、短辺区間の長さは互いに等しく、角接合部と該角接合部に隣接する近接接合部との間隔をＬａとし、長辺区間の長さをＬｂとし、短辺区間の長さをＬｃとするとき、Ｌａ＜Ｌｃ＜Ｌｂの関係が成り立つことが好ましい。この場合、ダミー構造体とダミー樹脂枠部材との接合工程を簡素化しつつ、ダミー構造体とダミー樹脂枠部材との接合強度を効果的に高めて、より高品質にダミーセルを得ることが可能になる。   In the above fuel cell stack, the lengths of the long side sections are equal to each other, the lengths of the short side sections are equal to each other, and the interval between the corner joint and the adjacent joint adjacent to the corner joint is La. When the length of the section is Lb and the length of the short side section is Lc, it is preferable that the relationship of La <Lc <Lb holds. In this case, it is possible to effectively increase the bonding strength between the dummy structure and the dummy resin frame member while simplifying the bonding process between the dummy structure and the dummy resin frame member, and to obtain a dummy cell with higher quality. Become.

上記の燃料電池スタックにおいて、接着樹脂は、溶融させたダミー樹脂枠部材の一部であることが好ましい。この場合、ダミー樹脂枠部材の一部を溶融させて導電性多孔質体に含浸させる一層簡素な工程でダミー樹脂枠部材と導電性多孔質体とを接合してダミーセルを効率的に得ることができる。   In the fuel cell stack, the adhesive resin is preferably a part of a melted dummy resin frame member. In this case, a dummy cell can be efficiently obtained by joining the dummy resin frame member and the conductive porous body through a simpler process in which a part of the dummy resin frame member is melted and impregnated into the conductive porous body. it can.

上記の燃料電池スタックにおいて、ダミー樹脂枠部材の一部は、ダミー樹脂枠部材の厚さ方向に突出するように設けられた樹脂突起部であることが好ましい。この場合、ダミー樹脂突起部を溶融して得られる十分な量の接着樹脂を導電性多孔質体に含浸させて含浸接合部を良好に形成することができる。これによって、ダミー樹脂枠部材と導電性多孔質体との接合強度を簡素な工程で高めることができる。   In the fuel cell stack, a part of the dummy resin frame member is preferably a resin projection provided so as to protrude in the thickness direction of the dummy resin frame member. In this case, it is possible to satisfactorily form the impregnated joint by impregnating the conductive porous body with a sufficient amount of the adhesive resin obtained by melting the dummy resin protrusion. Thereby, the bonding strength between the dummy resin frame member and the conductive porous body can be increased by a simple process.

上記の燃料電池スタックにおいて、３枚の導電性多孔質体は、第１導電性多孔質体と、第１導電性多孔質体よりも平面寸法が大きい第２導電性多孔質体と、第２導電性多孔質体よりも平面寸法が大きい第３導電性多孔質体とを有し、ダミー樹脂枠部材は、外周縁部と、外周縁部の内周端から第１段差面を介して全周に亘って内方に突出した棚部と、棚部の内周端から第２段差面を介して全周に亘って内方に突出した薄肉部とを有し、第３導電性多孔質体の外周縁部は、ダミー樹脂枠部材の棚部に重なり、第２導電性多孔質体の外周縁部は、ダミー樹脂枠部材の薄肉部に臨み、第１導電性多孔質体の外周端面は、ダミー樹脂枠部材の内周端面に対向することが好ましい。   In the fuel cell stack, the three conductive porous bodies include a first conductive porous body, a second conductive porous body having a larger planar dimension than the first conductive porous body, and a second conductive porous body. A third conductive porous body having a planar dimension larger than that of the conductive porous body, and the dummy resin frame member has an outer peripheral edge portion and an inner peripheral end of the outer peripheral edge portion through the first step surface. A third conductive porous body having a shelf portion projecting inward over the circumference and a thin portion projecting inward over the entire circumference from the inner circumferential end of the shelf portion via the second step surface. The outer peripheral edge of the body overlaps the shelf of the dummy resin frame member, the outer peripheral edge of the second conductive porous body faces the thin wall portion of the dummy resin frame member, and the outer peripheral end surface of the first conductive porous body Is preferably opposed to the inner peripheral end face of the dummy resin frame member.

上記の燃料電池スタックにおいて、ダミー樹脂枠部材の棚部と、第３導電性多孔質体の外周縁部とが含浸接合部により接合されることが好ましい。   In the fuel cell stack described above, it is preferable that the shelf portion of the dummy resin frame member and the outer peripheral edge portion of the third conductive porous body are joined by the impregnation joining portion.

上記の燃料電池スタックにおいて、第２導電性多孔質体の厚みは、第２段差面の高さよりも大きいことが好ましい。   In the fuel cell stack, the thickness of the second conductive porous body is preferably larger than the height of the second step surface.

上記の燃料電池スタックにおいて、ダミー樹脂枠部材の薄肉部と、第３導電性多孔質体との間には、空間が形成されることが好ましい。   In the fuel cell stack, a space is preferably formed between the thin portion of the dummy resin frame member and the third conductive porous body.

また、本発明は、電解質膜の両側に導電性多孔質体からなるガス拡散層を有する電極がそれぞれ配設された電解質膜・電極構造体と、電解質膜・電極構造体の外周を周回する樹脂枠部材と、電解質膜・電極構造体を挟むセパレータとを有する発電セルを複数積層した積層体を備える燃料電池スタックの積層体の積層方向の少なくとも一方の端部に配設されるダミーセルの製造方法であって、矩形状の平面寸法がそれぞれ異なる３枚の導電性多孔質体を積層して、電解質膜・電極構造体に対応するダミー構造体を形成する第１積層工程と、ダミー構造体の外周を周回するようにダミー樹脂枠部材を配置した状態で、少なくとも１枚の導電性多孔質体の外周縁部の周方向に断続的に接着樹脂を含浸させて含浸接合部を形成することにより、ダミー構造体とダミー樹脂枠部材とを接合する接合工程と、ダミー樹脂枠部材と接合されたダミー構造体をダミーセパレータで挟む第２積層工程と、を有することを特徴とする。   The present invention also provides an electrolyte membrane / electrode structure in which electrodes each having gas diffusion layers made of a conductive porous material are disposed on both sides of the electrolyte membrane, and a resin that circulates around the outer periphery of the electrolyte membrane / electrode structure. Manufacturing method of dummy cell disposed at at least one end in the stacking direction of a stack of fuel cell stacks including a stack of a plurality of power generation cells having a frame member and a separator sandwiching an electrolyte membrane / electrode structure A first laminating step of laminating three conductive porous bodies each having a different rectangular planar dimension to form a dummy structure corresponding to the electrolyte membrane / electrode structure; By disposing the dummy resin frame member around the outer periphery and intermittently impregnating the adhesive resin in the circumferential direction of the outer peripheral edge of at least one conductive porous body to form an impregnated joint ,dummy Characterized in that it has a bonding step of bonding the granulated material and the dummy resin frame member, and a second laminating step of sandwiching the dummy structure that is bonded to the dummy resin frame member dummy separator, a.

このダミーセルの製造方法によれば、接合工程において、ダミー構造体の少なくとも１枚の導電性多孔質体の外周の周方向に断続的に含浸接合部を設けて、ダミー構造体とダミー樹脂枠部材とを接合する。このため、導電性多孔質体の外周を周回して含浸接合部を設ける場合に比して接合工程を簡素化して、効率的にダミーセルを得ることができる。   According to this dummy cell manufacturing method, in the joining step, the dummy structure and the dummy resin frame member are provided by intermittently providing the impregnated joining portion in the circumferential direction of the outer periphery of at least one conductive porous body of the dummy structure. And join. For this reason, compared with the case where an impregnation joining part is provided around the outer periphery of the conductive porous body, the joining process can be simplified and a dummy cell can be obtained efficiently.

このように簡素な接合工程によっても、含浸接合部が導電性多孔質体に接着樹脂を含浸させて形成されるため、ダミー樹脂枠部材と導電性多孔質体との接合強度を高めることができる。また、上記のように断続的に含浸接合部を設けることで、ダミー樹脂枠部材に加熱による反り等が生じることを抑制できる。これらによって、ダミーセルを高品質に得ることができる。   Even in such a simple joining process, since the impregnated joint is formed by impregnating the conductive porous body with the adhesive resin, the joint strength between the dummy resin frame member and the conductive porous body can be increased. . Moreover, it can suppress that the curvature etc. by heating generate | occur | produce in a dummy resin frame member by providing an impregnation junction part intermittently as mentioned above. As a result, dummy cells can be obtained with high quality.

上記のようにして得られたダミーセルを積層体の積層方向の少なくとも一方の端部に備えることで、該積層体の端部側の断熱性を高めることができるため、燃料電池スタックの発電安定性を向上させることができる。   Since the dummy cell obtained as described above is provided at at least one end in the stacking direction of the stack, the heat insulation on the end of the stack can be improved. Can be improved.

以上から、このダミーセルの製造方法によれば、簡素な工程で効率的且つ高品質にダミーセルを得ることができ、該ダミーセルを備える燃料電池スタックの発電安定性を向上させることができる。   As described above, according to the method for manufacturing a dummy cell, a dummy cell can be obtained efficiently and with high quality by a simple process, and the power generation stability of a fuel cell stack including the dummy cell can be improved.

上記のダミーセルの製造方法において、接合工程では、含浸接合部として、導電性多孔質体の角部に角接合部を形成し、導電性多孔質体の長辺の角接合部に近接する位置に近接接合部を形成することが好ましい。この場合、含浸接合部を断続的に設けることで簡素化した接合工程によっても、ダミー樹脂枠部材と導電性多孔質体とを十分な強度で接合できるため、ダミーセルを高品質に得ることができる。   In the above dummy cell manufacturing method, in the joining step, as the impregnated joint, a corner joint is formed at the corner of the conductive porous body, and at a position close to the corner joint of the long side of the conductive porous body. It is preferable to form a proximity junction. In this case, since the dummy resin frame member and the conductive porous body can be joined with sufficient strength even by a joining process simplified by providing the impregnated joints intermittently, the dummy cells can be obtained with high quality. .

上記のダミーセルの製造方法において、接合工程では、含浸接合部として、導電性多孔質体の長辺の角接合部同士の間を複数の長辺区間に分割するように配置される長辺接合部と、導電性多孔質体の短辺の角接合部同士の間を複数の短辺区間に分割するように配置される短辺接合部とを、長辺区間のそれぞれの長さが、短辺区間のそれぞれの長さより大きくなるように設けることが好ましい。この場合、ダミー構造体とダミー樹脂枠部材とを効率的に接合すること、及び十分な強度で接合することの両立を良好に図ることが可能になる。   In the above dummy cell manufacturing method, in the joining step, as the impregnated joint, a long-side joint disposed so as to divide the long-side corner joints of the conductive porous body into a plurality of long-side sections. And the short-side joints arranged so as to divide the short-side corner joints of the conductive porous body into a plurality of short-side sections. It is preferable to provide it so as to be larger than each length of the section. In this case, it is possible to satisfactorily achieve both the efficient joining of the dummy structure and the dummy resin frame member and the joining with sufficient strength.

上記のダミーセルの製造方法において、長辺区間の長さを互いに等しくし、短辺区間の長さを互いに等しくし、角接合部と該角接合部に隣接する近接接合部との間隔をＬａとし、長辺区間の長さをＬｂとし、短辺区間の長さをＬｃとするとき、Ｌａ＜Ｌｃ＜Ｌｂの関係が成り立つように導電性多孔質体に含浸接合部を設けることが好ましい。この場合、接合工程を簡素化しつつ、ダミー構造体とダミー樹脂枠部材との接合強度を効果的に高めて、より高品質にダミーセルを得ることが可能になる。   In the above dummy cell manufacturing method, the lengths of the long side sections are made equal to each other, the lengths of the short side sections are made equal to each other, and the interval between the corner joint and the adjacent joint adjacent to the corner joint is La. When the length of the long side section is Lb and the length of the short side section is Lc, the conductive porous body is preferably provided with an impregnated joint so that the relationship La <Lc <Lb is established. In this case, it is possible to effectively increase the bonding strength between the dummy structure and the dummy resin frame member while simplifying the bonding process, and to obtain a dummy cell with higher quality.

上記のダミーセルの製造方法において、接合工程では、接着樹脂として、溶融したダミー樹脂枠部材の一部を導電性多孔質体に含浸させて含浸接合部を形成することが好ましい。この場合、ダミー樹脂枠部材の一部を溶融させて導電性多孔質体に含浸させる一層簡素な工程でダミー構造体とダミー樹脂枠部材とを接合してダミーセルを効率的に得ることができる。   In the above dummy cell manufacturing method, it is preferable that in the bonding step, the conductive porous body is impregnated with a part of the molten dummy resin frame member as an adhesive resin to form an impregnated bonded portion. In this case, a dummy cell can be efficiently obtained by joining the dummy structure and the dummy resin frame member by a simpler process in which a part of the dummy resin frame member is melted and impregnated into the conductive porous body.

上記のダミーセルの製造方法において、接合工程では、ダミー樹脂枠部材の厚さ方向に突出するように設けた樹脂突起部をダミー樹脂枠部材の一部とすることが好ましい。この場合、樹脂突起部を溶融して得られる十分な量の接着樹脂を導電性多孔質体に含浸させて含浸接合部を良好に形成することができるため、ダミー構造体とダミー樹脂枠部材との接合強度を簡素な工程で高めることができる。   In the above dummy cell manufacturing method, in the joining step, it is preferable that a resin protrusion provided so as to protrude in the thickness direction of the dummy resin frame member is a part of the dummy resin frame member. In this case, since the conductive porous body can be satisfactorily formed by impregnating the conductive porous body with a sufficient amount of the adhesive resin obtained by melting the resin protrusions, the dummy structure and the dummy resin frame member The bonding strength can be increased by a simple process.

上記のダミーセルの製造方法において、第１積層工程では、３枚の導電性多孔質体として、第１導電性多孔質体と、第１導電性多孔質体よりも平面寸法が大きい第２導電性多孔質体と、第２導電性多孔質体よりも平面寸法が大きい第３導電性多孔質体とを積層してダミー構造体を形成し、ダミー樹脂枠部材は、外周縁部と、外周縁部の内周端から第１段差面を介して全周に亘って内方に突出した棚部と、棚部の内周端から第２段差面を介して全周に亘って内方に突出した薄肉部とを有し、接合工程では、第３導電性多孔質体の外周縁部を、ダミー樹脂枠部材の棚部に重ね、第２導電性多孔質体の外周縁部を、ダミー樹脂枠部材の薄肉部に臨ませ、第１導電性多孔質体の外周端面を、ダミー樹脂枠部材の内周端面に対向させた状態で、含浸接合部を形成することが好ましい。   In the above dummy cell manufacturing method, in the first stacking step, the three conductive porous bodies are the first conductive porous body and the second conductive having a larger planar dimension than the first conductive porous body. A dummy structure is formed by laminating a porous body and a third conductive porous body having a planar dimension larger than that of the second conductive porous body. The dummy resin frame member includes an outer peripheral edge, an outer peripheral edge, A shelf that protrudes inward over the entire circumference from the inner peripheral end of the portion through the first step surface, and an inward protrusion over the entire periphery from the inner peripheral end of the shelf through the second step surface In the joining step, the outer peripheral edge of the third conductive porous body is overlaid on the shelf of the dummy resin frame member, and the outer peripheral edge of the second conductive porous body is connected to the dummy resin. Impregnation bonding with the outer peripheral end face of the first conductive porous body facing the inner peripheral end face of the dummy resin frame member facing the thin part of the frame member Preferably it is formed.

上記のダミーセルの製造方法において、接合工程では、ダミー樹脂枠部材の棚部と、第３導電性多孔質体の外周縁部とを含浸接合部により接合することが好ましい。   In the dummy cell manufacturing method, in the joining step, it is preferable to join the shelf portion of the dummy resin frame member and the outer peripheral edge portion of the third conductive porous body by the impregnation joining portion.

上記のダミーセルの製造方法において、第２導電性多孔質体の厚みは、第２段差面の高さよりも大きいことが好ましい。   In the above dummy cell manufacturing method, the thickness of the second conductive porous body is preferably larger than the height of the second step surface.

上記のダミーセルの製造方法において、第１積層工程では、ダミー樹脂枠部材の薄肉部と、第３導電性多孔質体との間に、空間を形成することが好ましい。   In the method for manufacturing a dummy cell, in the first stacking step, it is preferable to form a space between the thin portion of the dummy resin frame member and the third conductive porous body.

本発明によれば、簡素な工程で効率的且つ高品質に得られるダミーセルにより、燃料電池スタックの発電安定性を向上させることができる。   ADVANTAGE OF THE INVENTION According to this invention, the electric power generation stability of a fuel cell stack can be improved with the dummy cell obtained efficiently and with high quality by a simple process.

本発明の実施形態に係る燃料電池スタックの分解斜視図である。1 is an exploded perspective view of a fuel cell stack according to an embodiment of the present invention. 図１の燃料電池スタックのＩＩ−ＩＩ線矢視断面図である。FIG. 2 is a cross-sectional view taken along the line II-II of the fuel cell stack of FIG. 1. 発電セルの分解斜視図である。It is a disassembled perspective view of a power generation cell. 第１セパレータの酸化剤ガス流路側の正面図である。It is a front view of the oxidizing gas channel side of the first separator. 第２セパレータの酸化剤ガス流路側の正面図である。It is a front view of the oxidizing gas channel side of the second separator. 第３セパレータの冷却媒体流路側の正面図である。It is a front view by the side of the cooling medium channel of the 3rd separator. 樹脂枠付きＭＥＡのアノード電極側の正面図である。It is a front view by the side of the anode electrode of MEA with a resin frame. 図７のＶＩＩＩ−ＶＩＩＩ線矢視断面図である。FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. 樹脂枠付きダミー構造体の第３導電性多孔質体側の正面図である。It is a front view by the side of the 3rd conductive porous body of a dummy structure with a resin frame. 図９のＸ−Ｘ線矢視断面図である。FIG. 10 is a cross-sectional view taken along line XX in FIG. 9. ダミー構造体の分解斜視図である。It is a disassembled perspective view of a dummy structure. ダミー第１セパレータ及びダミー第２セパレータの第２空間側の正面図である。It is a front view by the side of the 2nd space of a dummy 1st separator and a dummy 2nd separator.

本発明に係る燃料電池スタックについて好適な実施形態を挙げ、添付の図面を参照しながら詳細に説明する。なお、以下の図において、同一又は同様の機能及び効果を奏する構成要素に対しては同一の参照符号を付し、繰り返しの説明を省略する場合がある。   Preferred embodiments of the fuel cell stack according to the present invention will be described in detail with reference to the accompanying drawings. In the following drawings, components having the same or similar functions and effects are denoted by the same reference numerals, and repeated description may be omitted.

図１及び図２に示すように、本実施形態に係る燃料電池スタック１０は、複数の発電セル１２が水平方向（矢印Ａ１、Ａ２方向）又は重力方向（矢印Ｃ１、Ｃ２方向）に積層された積層体１４を備える。燃料電池スタック１０は、例えば、図示しない燃料電池電気自動車等の燃料電池車両に搭載される。   As shown in FIGS. 1 and 2, the fuel cell stack 10 according to the present embodiment includes a plurality of power generation cells 12 stacked in the horizontal direction (arrow A1, A2 direction) or the gravity direction (arrow C1, C2 direction). A laminate 14 is provided. The fuel cell stack 10 is mounted on a fuel cell vehicle such as a fuel cell electric vehicle (not shown), for example.

図２に示すように、積層体１４の積層方向一端側（矢印Ａ１側）には、第１端部発電ユニット１６、第１ダミーセル１８及び第２ダミーセル２０が外方に向かって配置される。また、積層体１４の積層方向他端側（矢印Ａ２側）には、第２端部発電ユニット２２及び第３ダミーセル２４が外方に向かって配置される。積層体１４の第２ダミーセル２０よりも外方側（矢印Ａ１側）には、ターミナルプレート２６ａ、インシュレータ２８ａ及びエンドプレート３０ａがこの順に積層される。積層体１４の第３ダミーセル２４よりも外方側（矢印Ａ２側）には、ターミナルプレート２６ｂ、インシュレータ２８ｂ及びエンドプレート３０ｂがこの順に積層される。   As shown in FIG. 2, the first end power generation unit 16, the first dummy cells 18, and the second dummy cells 20 are disposed outwardly at one end side (arrow A <b> 1 side) in the stacking direction of the stacked body 14. Further, the second end power generation unit 22 and the third dummy cell 24 are disposed outwardly on the other end side (arrow A2 side) in the stacking direction of the stacked body 14. A terminal plate 26a, an insulator 28a, and an end plate 30a are stacked in this order on the outer side (arrow A1 side) of the stacked body 14 than the second dummy cell 20. A terminal plate 26b, an insulator 28b, and an end plate 30b are stacked in this order on the outer side (arrow A2 side) of the stacked body 14 than the third dummy cell 24.

図１に示すように、長方形状からなるエンドプレート３０ａ、３０ｂの各辺間には、連結バー（不図示）が配置される。各連結バーは、両端をエンドプレート３０ａ、３０ｂの内面にボルト（不図示）等を介して固定され、複数の積層された発電セル１２に積層方向（矢印Ａ１、Ａ２方向）の締め付け荷重を付与する。なお、燃料電池スタック１０では、エンドプレート３０ａ、３０ｂを端板とする筐体を備え、前記筐体内に積層体１４等を収容するように構成してもよい。   As shown in FIG. 1, a connecting bar (not shown) is disposed between the sides of the rectangular end plates 30a and 30b. Each connecting bar is fixed at both ends to the inner surfaces of the end plates 30a and 30b via bolts (not shown), etc., and applies a tightening load in the stacking direction (arrows A1 and A2 directions) to the stacked power generation cells 12 To do. Note that the fuel cell stack 10 may include a housing having end plates 30a and 30b as end plates, and the stacked body 14 and the like may be accommodated in the housing.

図３に示すように、発電セル１２は、第１セパレータ３２と、樹脂枠付きＭＥＡ３４と、第２セパレータ３６と、樹脂枠付きＭＥＡ３４と、第３セパレータ３８とがこの順に積層されて構成される。第１セパレータ３２、第２セパレータ３６及び第３セパレータ３８のそれぞれは、例えば、鋼板、ステンレス鋼板、アルミニウム板、めっき処理鋼板等により構成され、平面が矩形状であるとともに、プレス加工等により、断面凹凸形状に成形される。   As shown in FIG. 3, the power generation cell 12 is configured by laminating a first separator 32, an MEA 34 with a resin frame, a second separator 36, an MEA 34 with a resin frame, and a third separator 38 in this order. . Each of the first separator 32, the second separator 36, and the third separator 38 is made of, for example, a steel plate, a stainless steel plate, an aluminum plate, a plated steel plate, and the like. Molded into an uneven shape.

図１及び図３に示すように、各セパレータ３２、３６、３８の長辺方向の一端側（矢印Ｂ１側）の縁部には、それぞれ矢印Ａ１、Ａ２方向（積層方向）に個別に連通して、酸化剤ガス入口連通孔４０及び燃料ガス出口連通孔４２が設けられる。酸化剤ガス入口連通孔４０は、酸化剤ガス、例えば、酸素含有ガスを供給する。燃料ガス出口連通孔４２は、燃料ガス、例えば、水素含有ガスを排出する。これらの酸化剤ガス及び燃料ガスを総称して反応ガスともいう。   As shown in FIG. 1 and FIG. 3, the edges of one end side (arrow B1 side) in the long side direction of each separator 32, 36, and 38 are individually communicated in the arrow A1 and A2 directions (stacking direction), respectively. Thus, an oxidant gas inlet communication hole 40 and a fuel gas outlet communication hole 42 are provided. The oxidant gas inlet communication hole 40 supplies an oxidant gas, for example, an oxygen-containing gas. The fuel gas outlet communication hole 42 discharges a fuel gas, for example, a hydrogen-containing gas. These oxidant gas and fuel gas are also collectively referred to as reaction gas.

各セパレータ３２、３６、３８の長辺方向の他端側（矢印Ｂ２側）の縁部には、それぞれ矢印Ａ１、Ａ２方向に個別に連通して、燃料ガスを供給する燃料ガス入口連通孔４４及び酸化剤ガスを排出する酸化剤ガス出口連通孔４６が設けられる。なお、これらの酸化剤ガス入口連通孔４０、燃料ガス出口連通孔４２、燃料ガス入口連通孔４４、酸化剤ガス出口連通孔４６を総称して反応ガス連通孔ともいう。   A fuel gas inlet communication hole 44 for supplying fuel gas to the edge of each separator 32, 36, 38 on the other end side (arrow B 2 side) in the long side direction individually communicating in the directions of arrows A 1, A 2, respectively. And an oxidant gas outlet communication hole 46 for discharging the oxidant gas. The oxidant gas inlet communication hole 40, the fuel gas outlet communication hole 42, the fuel gas inlet communication hole 44, and the oxidant gas outlet communication hole 46 are also collectively referred to as a reaction gas communication hole.

各セパレータ３２、３６、３８の短辺方向（矢印Ｃ１、Ｃ２方向）両端縁部の矢印Ｂ１側には、矢印Ａ１、Ａ２方向に個別に連通して、冷却媒体を供給するための一対の冷却媒体入口連通孔４８がそれぞれ設けられる。各セパレータの短辺方向の両端縁部の矢印Ｂ２側には、矢印Ａ１、Ａ２方向に個別に連通して、冷却媒体を排出するための一対の冷却媒体出口連通孔５０がそれぞれ設けられる。   A pair of cooling for supplying a cooling medium individually communicating in the directions of arrows A1 and A2 to the arrow B1 side of the both edges of each separator 32, 36, and 38 in the short side direction (arrows C1 and C2 directions) Each of the medium inlet communication holes 48 is provided. A pair of cooling medium outlet communication holes 50 for individually discharging in the directions of arrows A1 and A2 and discharging the cooling medium are provided on the arrow B2 side at both end edges in the short side direction of each separator.

図３に示すように、第１セパレータ３２の矢印Ａ１側の面３２ａには、冷却媒体入口連通孔４８と冷却媒体出口連通孔５０とを連通する冷却媒体流路５２が形成される。冷却媒体入口連通孔４８と冷却媒体流路５２との間には、複数本の入口連結溝５４ａが形成される。冷却媒体流路５２と冷却媒体出口連通孔５０との間には、複数本の出口連結溝５４ｂが形成される。また、第１セパレータ３２の面３２ａには、冷却媒体入口連通孔４８、冷却媒体出口連通孔５０、冷却媒体流路５２、入口連結溝５４ａ、出口連結溝５４ｂを一体に囲んで、その内部を面方向の外部とシールするシール部材５５が設けられている。   As shown in FIG. 3, a cooling medium flow path 52 that connects the cooling medium inlet communication hole 48 and the cooling medium outlet communication hole 50 is formed on the surface 32 a on the arrow A <b> 1 side of the first separator 32. A plurality of inlet connection grooves 54 a are formed between the cooling medium inlet communication hole 48 and the cooling medium flow path 52. A plurality of outlet connection grooves 54 b are formed between the cooling medium flow path 52 and the cooling medium outlet communication hole 50. The surface 32a of the first separator 32 integrally surrounds the cooling medium inlet communication hole 48, the cooling medium outlet communication hole 50, the cooling medium flow path 52, the inlet connection groove 54a, and the outlet connection groove 54b. A seal member 55 that seals the outside in the surface direction is provided.

図４に示すように、第１セパレータ３２の矢印Ａ２側の面３２ｂには、酸化剤ガス入口連通孔４０と酸化剤ガス出口連通孔４６とに連通する酸化剤ガス流路５６が形成される。酸化剤ガス流路５６は、互いに並列する複数本の波状流路溝（又は直線状流路溝）からなる。   As shown in FIG. 4, an oxidant gas flow path 56 communicating with the oxidant gas inlet communication hole 40 and the oxidant gas outlet communication hole 46 is formed on the surface 32 b on the arrow A <b> 2 side of the first separator 32. . The oxidant gas flow channel 56 includes a plurality of wavy flow channel grooves (or linear flow channel grooves) arranged in parallel with each other.

酸化剤ガス流路５６の入口側端部には、発電領域外に位置して酸化剤ガス入口バッファ部５８が連なる一方、該酸化剤ガス流路５６の出口側端部には、発電領域外に位置して酸化剤ガス出口バッファ部６０が連なる。   The inlet side end of the oxidant gas flow channel 56 is connected to the oxidant gas inlet buffer 58 located outside the power generation region, while the outlet side end of the oxidant gas flow channel 56 is connected to the outside of the power generation region. The oxidant gas outlet buffer unit 60 is located in a row.

酸化剤ガス入口バッファ部５８と酸化剤ガス入口連通孔４０との間には、複数本の入口連結溝６２ａが形成される。酸化剤ガス出口バッファ部６０と酸化剤ガス出口連通孔４６との間には、複数本の出口連結溝６２ｂが形成される。第１セパレータ３２の面３２ｂには、酸化剤ガス入口連通孔４０、酸化剤ガス出口連通孔４６、酸化剤ガス流路５６、酸化剤ガス入口バッファ部５８、酸化剤ガス出口バッファ部６０、入口連結溝６２ａ、出口連結溝６２ｂを一体に囲んで、その内部を面方向の外部とシールするシール部材６３が設けられている。第１セパレータ３２では、酸化剤ガス流路５６の裏面形状が、冷却媒体流路５２の一部を構成する（図２及び図３参照）。   A plurality of inlet connection grooves 62 a are formed between the oxidant gas inlet buffer portion 58 and the oxidant gas inlet communication hole 40. A plurality of outlet connection grooves 62 b are formed between the oxidant gas outlet buffer 60 and the oxidant gas outlet communication hole 46. The surface 32b of the first separator 32 has an oxidant gas inlet communication hole 40, an oxidant gas outlet communication hole 46, an oxidant gas flow path 56, an oxidant gas inlet buffer part 58, an oxidant gas outlet buffer part 60, an inlet. A seal member 63 is provided that integrally surrounds the connecting groove 62a and the outlet connecting groove 62b and seals the inside thereof with the outside in the surface direction. In the first separator 32, the back surface shape of the oxidant gas flow path 56 constitutes a part of the cooling medium flow path 52 (see FIGS. 2 and 3).

図３に示すように、第２セパレータ３６の矢印Ａ１側の面３６ａには、燃料ガス入口連通孔４４と燃料ガス出口連通孔４２とに連通する燃料ガス流路６６が形成される。燃料ガス流路６６は、互いに並列する複数本の波状流路溝（又は直線状流路溝）からなる。   As shown in FIG. 3, a fuel gas passage 66 communicating with the fuel gas inlet communication hole 44 and the fuel gas outlet communication hole 42 is formed on the surface 36 a on the arrow A <b> 1 side of the second separator 36. The fuel gas flow channel 66 is composed of a plurality of wavy flow channel grooves (or linear flow channel grooves) arranged in parallel with each other.

燃料ガス流路６６の入口側端部には、発電領域外に位置して燃料ガス入口バッファ部６８が連なる一方、該燃料ガス流路６６の出口側端部には、発電領域外に位置して燃料ガス出口バッファ部７０が連なる。燃料ガス入口バッファ部６８と燃料ガス入口連通孔４４との間には、第２セパレータ３６を厚さ方向に貫通する複数個の燃料ガス供給孔部７２ａが設けられる。燃料ガス出口バッファ部７０と燃料ガス出口連通孔４２との間には、第２セパレータ３６を厚さ方向に貫通する複数個の燃料ガス排出孔部７２ｂが設けられる。   A fuel gas inlet buffer unit 68 is connected to the inlet side end of the fuel gas flow channel 66 outside the power generation region, while an outlet side end of the fuel gas flow channel 66 is positioned outside the power generation region. Thus, the fuel gas outlet buffer unit 70 is connected. A plurality of fuel gas supply holes 72 a penetrating the second separator 36 in the thickness direction are provided between the fuel gas inlet buffer 68 and the fuel gas inlet communication hole 44. Between the fuel gas outlet buffer part 70 and the fuel gas outlet communication hole 42, a plurality of fuel gas discharge hole parts 72b penetrating the second separator 36 in the thickness direction are provided.

第２セパレータ３６の面３６ａには、燃料ガス流路６６、燃料ガス入口バッファ部６８、燃料ガス出口バッファ部７０、燃料ガス供給孔部７２ａ、燃料ガス排出孔部７２ｂを一体に囲んで、その内部を面方向の外部とシールするシール部材７３が設けられている。   The surface 36a of the second separator 36 integrally surrounds the fuel gas passage 66, the fuel gas inlet buffer 68, the fuel gas outlet buffer 70, the fuel gas supply hole 72a, and the fuel gas discharge hole 72b. A seal member 73 that seals the inside from the outside in the surface direction is provided.

図５に示すように、第２セパレータ３６の矢印Ａ２側の面３６ｂは、シール部材７１で囲われた燃料ガス供給孔部７２ａ及び燃料ガス排出孔部７２ｂが設けられていることを除いて、第１セパレータ３２の矢印Ａ２側の面３２ｂ（図４参照）と同様に構成することができる。すなわち、第２セパレータ３６の面３６ｂには、酸化剤ガス入口連通孔４０と酸化剤ガス出口連通孔４６とに連通する酸化剤ガス流路５６が設けられる。また、第２セパレータ３６の面３６ｂには、酸化剤ガス入口バッファ部５８と、酸化剤ガス出口バッファ部６０と、入口連結溝６２ａと、出口連結溝６２ｂと、シール部材６３とが形成される。   As shown in FIG. 5, the surface 36b on the arrow A2 side of the second separator 36 is provided with a fuel gas supply hole 72a and a fuel gas discharge hole 72b surrounded by a seal member 71, The first separator 32 can be configured in the same manner as the surface 32b (see FIG. 4) on the arrow A2 side. That is, an oxidant gas flow path 56 that communicates with the oxidant gas inlet communication hole 40 and the oxidant gas outlet communication hole 46 is provided on the surface 36 b of the second separator 36. Further, an oxidant gas inlet buffer portion 58, an oxidant gas outlet buffer portion 60, an inlet connection groove 62a, an outlet connection groove 62b, and a seal member 63 are formed on the surface 36b of the second separator 36. .

第２セパレータ３６の面３６ｂ側では、燃料ガス供給孔部７２ａ及び燃料ガス排出孔部７２ｂの各々と、酸化剤ガス入口バッファ部５８及び酸化剤ガス出口バッファ部６０とがシール部材６３、７１によって遮断されている。   On the surface 36b side of the second separator 36, each of the fuel gas supply hole portion 72a and the fuel gas discharge hole portion 72b, and the oxidant gas inlet buffer portion 58 and the oxidant gas outlet buffer portion 60 are sealed by seal members 63 and 71, respectively. Blocked.

図３に示すように、第３セパレータ３８の矢印Ａ１側の面３８ａは、第２セパレータ３６の矢印Ａ１側の面３６ａと同様に構成することができる。すなわち、第３セパレータ３８の面３８ａには、燃料ガス入口連通孔４４と燃料ガス出口連通孔４２とに連通する燃料ガス流路６６が設けられる。また、第３セパレータ３８の面３８ａには、燃料ガス入口バッファ部６８と、燃料ガス出口バッファ部７０と、燃料ガス供給孔部７２ａと、燃料ガス排出孔部７２ｂと、シール部材７３とが形成される。   As shown in FIG. 3, the surface 38 a on the arrow A <b> 1 side of the third separator 38 can be configured similarly to the surface 36 a on the arrow A <b> 1 side of the second separator 36. That is, the fuel gas flow channel 66 that communicates with the fuel gas inlet communication hole 44 and the fuel gas outlet communication hole 42 is provided on the surface 38 a of the third separator 38. A fuel gas inlet buffer portion 68, a fuel gas outlet buffer portion 70, a fuel gas supply hole portion 72a, a fuel gas discharge hole portion 72b, and a seal member 73 are formed on the surface 38a of the third separator 38. Is done.

図６に示すように、第３セパレータ３８の矢印Ａ２側の面３８ｂは、シール部材７１で囲われた燃料ガス供給孔部７２ａ及び燃料ガス排出孔部７２ｂが設けられていることを除いて、第１セパレータ３２の矢印Ａ１側の面３２ａ（図３参照）と同様に構成することができる。すなわち、第３セパレータ３８の面３８ｂには、冷却媒体流路５２と、入口連結溝５４ａと、出口連結溝５４ｂと、シール部材５５とが設けられる。第３セパレータ３８の面３８ｂ側では、燃料ガス供給孔部７２ａ及び燃料ガス排出孔部７２ｂの各々と、冷却媒体流路５２、入口連結溝５４ａ及び出口連結溝５４ｂとがシール部材５５、７１によって遮断されている。   As shown in FIG. 6, the surface 38b on the arrow A2 side of the third separator 38 is provided with a fuel gas supply hole 72a and a fuel gas discharge hole 72b surrounded by a seal member 71, The first separator 32 can be configured similarly to the surface 32a (see FIG. 3) on the arrow A1 side. That is, the cooling medium flow path 52, the inlet connection groove 54a, the outlet connection groove 54b, and the seal member 55 are provided on the surface 38b of the third separator 38. On the surface 38b side of the third separator 38, each of the fuel gas supply hole portion 72a and the fuel gas discharge hole portion 72b, and the cooling medium flow path 52, the inlet connection groove 54a, and the outlet connection groove 54b are sealed by seal members 55 and 71. Blocked.

図２に示すように、互いに隣接する第３セパレータ３８の矢印Ａ２側の面３８ｂの冷却媒体流路５２と、第１セパレータ３２の矢印Ａ１側の面３２ａの冷却媒体流路５２とが対向して、その内部を冷却媒体が流通可能となっている。   As shown in FIG. 2, the cooling medium flow path 52 on the surface 38b on the arrow A2 side of the third separator 38 adjacent to each other and the cooling medium flow path 52 on the surface 32a on the arrow A1 side of the first separator 32 face each other. Thus, the cooling medium can circulate inside.

図３、図５及び図６に示すように、第２セパレータ３６及び第３セパレータ３８では、上記のようにシール部材７１、７３が設けられるため、燃料ガス入口連通孔４４を矢印Ａ１側から矢印Ａ２側へと流通する燃料ガスは、燃料ガス供給孔部７２ａを、矢印Ａ２側から矢印Ａ１側へと流通して燃料ガス入口バッファ部６８及び燃料ガス流路６６へ流入する。また、燃料ガス流路６６を流通して燃料ガス出口バッファ部７０に流入した燃料ガスは、燃料ガス排出孔部７２ｂを矢印Ａ１側から矢印Ａ２側へと流通した後、燃料ガス出口連通孔４２を矢印Ａ２側から矢印Ａ１側へと流通する。   As shown in FIGS. 3, 5, and 6, in the second separator 36 and the third separator 38, the seal members 71 and 73 are provided as described above. Therefore, the fuel gas inlet communication hole 44 is defined by the arrow from the arrow A <b> 1 side. The fuel gas flowing to the A2 side flows through the fuel gas supply hole 72a from the arrow A2 side to the arrow A1 side and flows into the fuel gas inlet buffer portion 68 and the fuel gas flow channel 66. The fuel gas flowing through the fuel gas flow channel 66 and flowing into the fuel gas outlet buffer 70 flows through the fuel gas discharge hole 72b from the arrow A1 side to the arrow A2 side, and then the fuel gas outlet communication hole 42. From the arrow A2 side to the arrow A1 side.

各セパレータ３２、３６、３８の両面には、該セパレータ３２、３６、３８の外周端縁部を周回する不図示の弾性体からなるシール部材がそれぞれ一体成形される。   On both surfaces of each separator 32, 36, 38, a sealing member made of an elastic body (not shown) that circulates around the outer peripheral edge of each separator 32, 36, 38 is integrally formed.

図３、図７及び図８に示すように、樹脂枠付きＭＥＡ３４は、横長の矩形状の電解質膜・電極構造体（ＭＥＡ）８０の外周に、横長の矩形状の樹脂枠部材８２が接合されて構成される。図８に示すように、電解質膜・電極構造体８０は、例えば、水分を含んだパーフルオロスルホン酸の薄膜である固体高分子電解質膜（以下、単に電解質膜ともいう）８４を備える。なお、電解質膜８４は、フッ素系電解質の他、ＨＣ（炭化水素）系電解質を使用してもよい。電解質膜８４は、カソード電極８６及びアノード電極８８により挟持される。   As shown in FIGS. 3, 7, and 8, the MEA 34 with a resin frame has a horizontally long rectangular resin frame member 82 joined to the outer periphery of a horizontally long rectangular electrolyte membrane / electrode structure (MEA) 80. Configured. As shown in FIG. 8, the electrolyte membrane / electrode structure 80 includes, for example, a solid polymer electrolyte membrane (hereinafter also simply referred to as an electrolyte membrane) 84 that is a thin film of perfluorosulfonic acid containing moisture. The electrolyte membrane 84 may use an HC (hydrocarbon) electrolyte in addition to the fluorine electrolyte. The electrolyte membrane 84 is sandwiched between the cathode electrode 86 and the anode electrode 88.

電解質膜・電極構造体８０は、カソード電極８６の平面寸法がアノード電極８８及び電解質膜８４の平面寸法よりも小さい段差型ＭＥＡを構成している。なお、カソード電極８６、アノード電極８８及び電解質膜８４は、同一の平面寸法に設定してもよい。また、アノード電極８８は、カソード電極８６及び電解質膜８４よりも小さな平面寸法を有してもよい。   The electrolyte membrane / electrode structure 80 constitutes a stepped MEA in which the planar dimensions of the cathode electrode 86 are smaller than the planar dimensions of the anode electrode 88 and the electrolyte membrane 84. The cathode electrode 86, the anode electrode 88, and the electrolyte membrane 84 may be set to have the same planar dimensions. Further, the anode electrode 88 may have a smaller planar dimension than the cathode electrode 86 and the electrolyte membrane 84.

カソード電極８６は、電解質膜８４の一端側（矢印Ａ１側）の面８４ａに接合される第１電極触媒層９０と、該第１電極触媒層９０に積層される第１ガス拡散層９２とを有する。第１電極触媒層９０は、第１ガス拡散層９２よりも大きな平面寸法であり、第１ガス拡散層９２の外周端面９２ａから外方に突出する外周露呈部９０ａを有する。また、第１電極触媒層９０は、電解質膜８４よりも小さな平面寸法である。   The cathode electrode 86 includes a first electrode catalyst layer 90 joined to a surface 84a on one end side (arrow A1 side) of the electrolyte membrane 84, and a first gas diffusion layer 92 laminated on the first electrode catalyst layer 90. Have. The first electrode catalyst layer 90 has a larger planar dimension than the first gas diffusion layer 92, and has an outer peripheral exposed portion 90 a that protrudes outward from the outer peripheral end surface 92 a of the first gas diffusion layer 92. The first electrode catalyst layer 90 has a smaller planar dimension than the electrolyte membrane 84.

アノード電極８８は、電解質膜８４の他端側（矢印Ａ２側）の面８４ｂに接合される第２電極触媒層９４と、該第２電極触媒層９４に積層される第２ガス拡散層９６とを有する。第２電極触媒層９４及び第２ガス拡散層９６は、同一の平面寸法を有するとともに、電解質膜８４と同一（又は同一未満）の平面寸法に設定される。   The anode electrode 88 includes a second electrode catalyst layer 94 joined to the surface 84b on the other end side (arrow A2 side) of the electrolyte membrane 84, and a second gas diffusion layer 96 laminated on the second electrode catalyst layer 94. Have The second electrode catalyst layer 94 and the second gas diffusion layer 96 have the same planar dimensions and are set to the same planar dimensions as (or less than) the electrolyte membrane 84.

第１電極触媒層９０は、例えば、白金合金が表面に担持された多孔質カーボン粒子が、イオン導電性高分子バインダとともに第１ガス拡散層９２の表面に一様に塗布して形成される。第２電極触媒層９４は、例えば、白金合金が表面に担持された多孔質カーボン粒子が、イオン導電性高分子バインダとともに第２ガス拡散層９６の表面に一様に塗布して形成される。   For example, the first electrode catalyst layer 90 is formed by uniformly applying porous carbon particles having a platinum alloy supported on the surface thereof to the surface of the first gas diffusion layer 92 together with an ion conductive polymer binder. The second electrode catalyst layer 94 is formed, for example, by uniformly applying porous carbon particles carrying a platinum alloy on the surface thereof to the surface of the second gas diffusion layer 96 together with an ion conductive polymer binder.

第１ガス拡散層９２及び第２ガス拡散層９６は、カーボンペーパ又はカーボンクロス等の導電性多孔質体から形成される。第２ガス拡散層９６の平面寸法は、第１ガス拡散層９２の平面寸法よりも大きく設定される。   The first gas diffusion layer 92 and the second gas diffusion layer 96 are formed of a conductive porous body such as carbon paper or carbon cloth. The planar dimension of the second gas diffusion layer 96 is set larger than the planar dimension of the first gas diffusion layer 92.

樹脂枠部材８２は、例えば、ＰＰＳ（ポリフェニレンサルファイド）、ＰＰＡ（ポリフタルアミド）、ＰＥＮ（ポリエチレンナフタレート）、ＰＥＳ（ポリエーテルサルフォン）、ＬＣＰ（リキッドクリスタルポリマー）、ＰＶＤＦ（ポリフッ化ビニリデン）、シリコーン樹脂、フッ素樹脂、ｍ−ＰＰＥ（変性ポリフェニレンエーテル樹脂）、ＰＥＴ（ポリエチレンテレフタレート）、ＰＢＴ（ポリブチレンテレフタレート）又は変性ポリオレフィン等の樹脂材から構成される。この樹脂材は、例えば、フィルム等により構成してもよい。   The resin frame member 82 includes, for example, PPS (polyphenylene sulfide), PPA (polyphthalamide), PEN (polyethylene naphthalate), PES (polyethersulfone), LCP (liquid crystal polymer), PVDF (polyvinylidene fluoride), It is composed of a resin material such as silicone resin, fluororesin, m-PPE (modified polyphenylene ether resin), PET (polyethylene terephthalate), PBT (polybutylene terephthalate), or modified polyolefin. For example, the resin material may be formed of a film or the like.

図３に示すように、樹脂枠部材８２は枠形状であり、酸化剤ガス入口連通孔４０を含む連通孔４０、４２、４４、４６、４８、５０からなる連通孔群の内側に配置され、各連通孔４０、４２、４４、４６、４８、５０が形成されない。また、図８に示すように、樹脂枠部材８２は、外周端８２ａ（図７参照）からその内側に所定の長さに亘って外周縁部８２ｂが設けられ、該外周縁部８２ｂからさらに内側に内側膨出部８２ｃが設けられる。   As shown in FIG. 3, the resin frame member 82 has a frame shape and is disposed inside a communication hole group including communication holes 40, 42, 44, 46, 48, 50 including the oxidant gas inlet communication hole 40, Each communication hole 40, 42, 44, 46, 48, 50 is not formed. Further, as shown in FIG. 8, the resin frame member 82 has an outer peripheral edge portion 82b extending from the outer peripheral edge 82a (see FIG. 7) to the inner side of the outer peripheral edge 82a (see FIG. 7). Is provided with an inner bulging portion 82c.

内側膨出部８２ｃは、外周縁部８２ｂの内周端から内側に向かって、第１段差面８２ｄを介して延在する棚部８２ｅと、該棚部８２ｅの内周端から内側に向かって第２段差面８２ｆを介して延在する薄肉部８２ｇとが設けられる。棚部８２ｅは、外周縁部８２ｂより薄肉であり、薄肉部８２ｇは、棚部８２ｅより薄肉である。また、第１段差面８２ｄ、棚部８２ｅ、第２段差面８２ｆ及び薄肉部８２ｇは、樹脂枠部材８２の全周に亘って設けられている。棚部８２ｅの矢印Ａ２側の面８２ｅａには、電解質膜８４の面８４ｂの外周縁部が当接する。薄肉部８２ｇの内周端には、第１電極触媒層９０の外周露呈部９０ａに対向する土手部８２ｈが全周に亘って設けられる。また、薄肉部８２ｇの、土手部８２ｈと第２段差面８２ｆとの間には溝部８２ｈａが設けられる。   The inner bulging portion 82c has a shelf portion 82e extending from the inner peripheral end of the outer peripheral edge portion 82b toward the inner side through the first step surface 82d, and an inner peripheral end of the shelf portion 82e toward the inner side. A thin portion 82g extending through the second step surface 82f is provided. The shelf part 82e is thinner than the outer peripheral edge part 82b, and the thin part 82g is thinner than the shelf part 82e. The first step surface 82d, the shelf 82e, the second step surface 82f, and the thin portion 82g are provided over the entire circumference of the resin frame member 82. The outer peripheral edge of the surface 84b of the electrolyte membrane 84 abuts on the surface 82ea on the arrow A2 side of the shelf 82e. A bank portion 82h facing the outer peripheral exposed portion 90a of the first electrode catalyst layer 90 is provided on the inner peripheral end of the thin portion 82g over the entire circumference. Further, a groove portion 82ha is provided between the bank portion 82h and the second step surface 82f of the thin wall portion 82g.

電解質膜８４の面８４ａの溝部８２ｈａに臨む部分及び第１電極触媒層９０の外周露呈部９０ａには、該外周露呈部９０ａを周回するように接着剤９８ａが充填されて接着剤層９８が設けられる。この接着剤層９８は、樹脂枠部材８２の内周端面８２ｉと第１ガス拡散層９２の外周端面９２ａとの間にも満たされる。接着剤９８ａとしては、例えば、高分子やフッ素系エラストマーを好適に用いることができるが、特にこれに限定されるものではない。接着剤９８ａは、液体や固体、熱可塑性や熱硬化性等に制限されるものではない。   The portion of the surface 84a of the electrolyte membrane 84 facing the groove 82ha and the outer peripheral exposed portion 90a of the first electrode catalyst layer 90 are filled with an adhesive 98a so as to circulate around the outer peripheral exposed portion 90a, and an adhesive layer 98 is provided. It is done. The adhesive layer 98 is also filled between the inner peripheral end surface 82 i of the resin frame member 82 and the outer peripheral end surface 92 a of the first gas diffusion layer 92. As the adhesive 98a, for example, a polymer or a fluorine-based elastomer can be suitably used, but it is not particularly limited thereto. The adhesive 98a is not limited to liquid, solid, thermoplasticity, thermosetting, or the like.

樹脂枠部材８２と第２ガス拡散層９６の外周縁部とは、接着用樹脂を用いた第１接合部１００により一体化される。図７に示すように、第１接合部１００は、第２ガス拡散層９６の外周縁部を周回するように設けられる。図８に示すように、第１接合部１００は、例えば、樹脂枠部材８２に対して、その外周縁部８２ｂの内周端を周回し且つ矢印Ａ２側に突出するように一体成形された樹脂突起部１００ａを加熱変形させて構成することができる。この第１接合部１００は、第１樹脂含浸部１００ｂと、第１溶融凝固部１００ｃとから形成される。   The resin frame member 82 and the outer peripheral edge portion of the second gas diffusion layer 96 are integrated by the first joint portion 100 using an adhesive resin. As shown in FIG. 7, the first joint portion 100 is provided so as to go around the outer peripheral edge portion of the second gas diffusion layer 96. As shown in FIG. 8, the first joint portion 100 is, for example, a resin that is integrally molded with respect to the resin frame member 82 so as to go around the inner peripheral end of the outer peripheral edge portion 82 b and protrude toward the arrow A <b> 2 side. The protrusion 100a can be configured by being thermally deformed. The first joint portion 100 is formed of a first resin impregnated portion 100b and a first melt-solidified portion 100c.

第１樹脂含浸部１００ｂは、溶融した樹脂突起部１００ａを、第２ガス拡散層９６の外周縁部に含浸させることで形成される。第１溶融凝固部１００ｃは、互いに離間して配置された樹脂枠部材８２の第１段差面８２ｄと、電解質膜８４及びアノード電極８８の外周端面１０１との間に、溶融させた樹脂突起部１００ａを流入させて凝固させることで形成される。図８では、第１溶融凝固部１００ｃと一体化した棚部８２ｅの表面及び第１段差面８２ｄを二点鎖線で示す。   The first resin impregnated portion 100 b is formed by impregnating the outer peripheral edge of the second gas diffusion layer 96 with the molten resin protrusion 100 a. The first molten and solidified portion 100c is melted between the first step surface 82d of the resin frame member 82 that is disposed apart from the outer peripheral end surface 101 of the electrolyte membrane 84 and the anode electrode 88. It is formed by injecting and solidifying. In FIG. 8, the surface of the shelf 82e integrated with the first melt-solidified portion 100c and the first step surface 82d are indicated by a two-dot chain line.

第１電極触媒層９０の外周露呈部９０ａ及び第１ガス拡散層９２の外周端面９２ａを周回するように接着剤層９８が設けられることや、第２ガス拡散層９６の外周縁部を周回するように第１接合部１００が設けられることにより、カソード電極８６及びアノード電極８８間のクロスリーク等が防止されている。   The adhesive layer 98 is provided so as to go around the outer peripheral exposed portion 90a of the first electrode catalyst layer 90 and the outer peripheral end surface 92a of the first gas diffusion layer 92, or go around the outer peripheral edge of the second gas diffusion layer 96. By providing the first joint portion 100 in this manner, cross leaks between the cathode electrode 86 and the anode electrode 88 are prevented.

図３に示すように、樹脂枠部材８２のカソード電極８６側（矢印Ａ１側）の面８２ｊには、酸化剤ガス入口バッファ部１０２ａ及び酸化剤ガス出口バッファ部１０２ｂが設けられる。樹脂枠部材８２のアノード電極８８側（矢印Ａ２側）の面８２ｋには、図７に示すように、燃料ガス入口バッファ部１０５ａ及び燃料ガス出口バッファ部１０５ｂが設けられる。   As shown in FIG. 3, an oxidant gas inlet buffer part 102a and an oxidant gas outlet buffer part 102b are provided on the surface 82j of the resin frame member 82 on the cathode electrode 86 side (arrow A1 side). As shown in FIG. 7, a fuel gas inlet buffer portion 105a and a fuel gas outlet buffer portion 105b are provided on the surface 82k of the resin frame member 82 on the anode electrode 88 side (arrow A2 side).

図２に示すように、第１端部発電ユニット１６は、矢印Ａ１側から矢印Ａ２側に向かって、第１セパレータ３２と、樹脂枠付きダミー構造体１０６と、ダミー第１セパレータ１０８と、樹脂枠付きＭＥＡ３４と、第３セパレータ３８とが、この順に積層されて構成される。   As shown in FIG. 2, the first end power generation unit 16 includes a first separator 32, a dummy structure 106 with a resin frame, a dummy first separator 108, and a resin from the arrow A1 side toward the arrow A2 side. The framed MEA 34 and the third separator 38 are stacked in this order.

図９及び図１０に示すように、樹脂枠付きダミー構造体１０６は、横長の矩形状のダミー構造体１１０の外周に、横長の矩形状のダミー樹脂枠部材１１１が接合されて構成される。図１０及び図１１に示すように、ダミー構造体１１０は、矩形状の平面寸法（表面積／外形寸法）がそれぞれ異なる３枚の第１導電性多孔質体１１２と、第２導電性多孔質体１１４と、第３導電性多孔質体１１６とを、矢印Ａ１側から矢印Ａ２側に向かってこの順に積層して構成される。平面寸法の大きさの関係は、第１導電性多孔質体１１２＜第２導電性多孔質体１１４＜第３導電性多孔質体１１６となっている。   As shown in FIG. 9 and FIG. 10, the dummy structure 106 with a resin frame is configured by joining a horizontally-long rectangular dummy resin frame member 111 to the outer periphery of a horizontally-long rectangular dummy structure 110. As shown in FIGS. 10 and 11, the dummy structure 110 includes three first conductive porous bodies 112 and second conductive porous bodies each having a rectangular planar dimension (surface area / external dimension) different from each other. 114 and the third conductive porous body 116 are laminated in this order from the arrow A1 side to the arrow A2 side. The relationship between the sizes of the planar dimensions is that the first conductive porous body 112 <the second conductive porous body 114 <the third conductive porous body 116.

従って、図１０に示すように、第３導電性多孔質体１１６の外周縁部には、全周に亘って第２導電性多孔質体１１４の外周端面１１４ａよりも外方に突出する外周露呈部１１６ａが設けられる。第２導電性多孔質体１１４の外周縁部には、全周に亘って第１導電性多孔質体１１２の外周端面１１２ａよりも外方に突出する外周露呈部１１４ｂが設けられる。   Therefore, as shown in FIG. 10, the outer peripheral exposure that protrudes outward from the outer peripheral end surface 114 a of the second conductive porous body 114 over the entire periphery is provided on the outer peripheral edge of the third conductive porous body 116. A portion 116a is provided. An outer peripheral exposed portion 114b that protrudes outward from the outer peripheral end surface 112a of the first conductive porous body 112 is provided over the entire outer peripheral edge of the second conductive porous body 114.

第１導電性多孔質体１１２と第２導電性多孔質体１１４と第３導電性多孔質体１１６は同じ材料からなるとともに、第１ガス拡散層９２又は第２ガス拡散層９６を構成する導電性多孔質体と同一の材料を用いて構成することができる。   The first conductive porous body 112, the second conductive porous body 114, and the third conductive porous body 116 are made of the same material, and the conductive material constituting the first gas diffusion layer 92 or the second gas diffusion layer 96 is used. The same material as the porous porous body can be used.

また、本実施形態では、第１導電性多孔質体１１２、第２導電性多孔質体１１４、第３導電性多孔質体１１６のそれぞれの厚さを、第２ガス拡散層９６を構成する導電性多孔質体と同一の厚さに設定した。これによって、該導電性多孔質体の平面寸法を上記のように調整することで、ダミー構造体１１０をさらに容易に得ることができる。   In the present embodiment, the thicknesses of the first conductive porous body 112, the second conductive porous body 114, and the third conductive porous body 116 are set to the conductive thicknesses of the second gas diffusion layer 96. The same thickness as the porous porous body was set. Thus, the dummy structure 110 can be obtained more easily by adjusting the planar dimensions of the conductive porous body as described above.

図１０に示すように、積層された第１導電性多孔質体１１２と第２導電性多孔質体１１４は接着剤層１１８ａにより接合され、第２導電性多孔質体１１４と第３導電性多孔質体１１６は接着剤層１１８ｂにより接合されている。接着剤層１１８ａ、１１８ｂは、接着剤層９８と同様に、接着剤９８ａを使用してもよい。   As shown in FIG. 10, the laminated first conductive porous body 112 and second conductive porous body 114 are joined by an adhesive layer 118a, and the second conductive porous body 114 and the third conductive porous body are joined. The material body 116 is joined by the adhesive layer 118b. The adhesive layers 118 a and 118 b may use the adhesive 98 a in the same manner as the adhesive layer 98.

図９及び図１０に示すように、ダミー樹脂枠部材１１１は、図７及び図８の樹脂枠付きＭＥＡ３４を構成する樹脂枠部材８２と同一の構成からなり、外周縁部８２ｂと、内側膨出部８２ｃとを有する。図１０に示すように、内側膨出部８２ｃの棚部８２ｅには、第３導電性多孔質体１１６の外周露呈部１１６ａの矢印Ａ１側が当接する。溝部８２ｈａには、第３導電性多孔質体１１６の外周露呈部１１６ａの矢印Ａ１側の一部が間隔をおいて臨むとともに、第２導電性多孔質体１１４の外周露呈部１１４ｂの矢印Ａ１側の一部が臨む。このため、ダミー樹脂枠部材１１１の薄肉部８２ｇと、第３導電性多孔質体１１６との間には空間が形成される。土手部８２ｈの突出端面には、第２導電性多孔質体１１４の外周露呈部１１４ｂの矢印Ａ１側が当接する。   As shown in FIGS. 9 and 10, the dummy resin frame member 111 has the same configuration as the resin frame member 82 that constitutes the MEA 34 with a resin frame in FIGS. 7 and 8, and includes an outer peripheral edge portion 82 b and an inner bulge. Part 82c. As shown in FIG. 10, the arrow A1 side of the outer peripheral exposed portion 116a of the third conductive porous body 116 abuts on the shelf 82e of the inner bulging portion 82c. In the groove 82ha, a part of the outer periphery exposed portion 116a of the third conductive porous body 116 on the arrow A1 side faces with a space, and the outer peripheral exposed portion 114b of the second conductive porous body 114 has an arrow A1 side. Part of For this reason, a space is formed between the thin portion 82 g of the dummy resin frame member 111 and the third conductive porous body 116. The arrow A1 side of the outer peripheral exposed portion 114b of the second conductive porous body 114 is in contact with the protruding end surface of the bank portion 82h.

矢印Ａ１、Ａ２方向において、第２導電性多孔質体１１４の外周端面１１４ａは、第３導電性多孔質体１１６と溝部８２ｈａとの間に配置される。ダミー樹脂枠部材１１１の内周端面８２ｉは、積層方向（矢印Ａ１、Ａ２方向）と垂直な方向において、第２導電性多孔質体１１４の外周端面１１４ａと、第１導電性多孔質体１１２の外周端面１１２ａとの間に位置する。ダミー樹脂枠部材１１１の内周端面８２ｉに、第１導電性多孔質体１１２の外周端面１１２ａが間隔を置いて臨む。第２段差面８２ｆの高さは、第２導電性多孔質体１１４の厚さよりも小さい。   In the directions of arrows A1 and A2, the outer peripheral end surface 114a of the second conductive porous body 114 is disposed between the third conductive porous body 116 and the groove 82ha. The inner peripheral end surface 82i of the dummy resin frame member 111 is formed in the direction perpendicular to the stacking direction (arrows A1 and A2 directions) and the outer peripheral end surface 114a of the second conductive porous body 114 and the first conductive porous body 112. It is located between the outer peripheral end face 112a. The outer peripheral end surface 112a of the first conductive porous body 112 faces the inner peripheral end surface 82i of the dummy resin frame member 111 with an interval. The height of the second step surface 82f is smaller than the thickness of the second conductive porous body 114.

ダミー構造体１１０のうち、平面寸法が最大となる第３導電性多孔質体１１６の外周露呈部１１６ａと、ダミー樹脂枠部材１１１の棚部８２ｅの矢印Ａ２側の面８２ｅａとが第２接合部１２０（含浸接合部）を介して接合されることで、樹脂枠付きダミー構造体１０６が構成される。   In the dummy structure 110, the outer peripheral exposed portion 116a of the third conductive porous body 116 having the maximum planar dimension and the surface 82ea on the arrow A2 side of the shelf 82e of the dummy resin frame member 111 are the second joint portion. The dummy structure body 106 with a resin frame is comprised by joining via 120 (impregnation joining part).

図９に示すように、第２接合部１２０は、第３導電性多孔質体１１６の外周縁部に対して、周方向に断続的に設けられる。具体的には、第２接合部１２０は、角接合部１２０ａと、近接接合部１２０ｂと、長辺接合部１２０ｃと、短辺接合部１２０ｄとを有する。角接合部１２０ａは、第３導電性多孔質体１１６の角部（四隅）にそれぞれ設けられる。近接接合部１２０ｂは、第３導電性多孔質体１１６の長辺１１７ａの角接合部１２０ａに近接する位置にそれぞれ設けられる。角接合部１２０ａと該角接合部１２０ａに隣接する近接接合部１２０ｂとの間隔はＬａとなっている。   As shown in FIG. 9, the second joint 120 is intermittently provided in the circumferential direction with respect to the outer peripheral edge of the third conductive porous body 116. Specifically, the second joint 120 includes a corner joint 120a, a proximity joint 120b, a long side joint 120c, and a short side joint 120d. The corner joint portions 120a are provided at the corner portions (four corners) of the third conductive porous body 116, respectively. The proximity junction 120b is provided at a position close to the corner junction 120a of the long side 117a of the third conductive porous body 116, respectively. The interval between the corner joint 120a and the adjacent joint 120b adjacent to the corner joint 120a is La.

長辺接合部１２０ｃは、第３導電性多孔質体１１６の長辺１１７ａの角接合部１２０ａ同士の間を複数の長辺区間に分割する位置に設けられる。本実施形態では、長辺接合部１２０ｃは、第３導電性多孔質体１１６の矢印Ｃ１側の長辺１１７ａ及び矢印Ｃ２側の長辺１１７ａの各々の角接合部１２０ａ同士の間に３個ずつ設けられている。また、これらの長辺接合部１２０ｃ同士の間、及び角接合部１２０ａと該角接合部１２０ａに隣接する長辺接合部１２０ｃとの間に形成される長辺区間のそれぞれの長さは、互いに同じＬｂとなっている。   The long side joint portion 120c is provided at a position where the corner joint portions 120a of the long sides 117a of the third conductive porous body 116 are divided into a plurality of long side sections. In the present embodiment, three long side joints 120c are provided between the corner joints 120a of the long side 117a on the arrow C1 side and the long side 117a on the arrow C2 side of the third conductive porous body 116. Is provided. Further, the lengths of the long side sections formed between the long side joints 120c and between the corner joint 120a and the long side joint 120c adjacent to the corner joint 120a are It is the same Lb.

短辺接合部１２０ｄは、第３導電性多孔質体１１６の短辺１１７ｂの角接合部１２０ａ同士の間を複数の短辺区間に分割する位置に設けられる。本実施形態では、短辺接合部１２０ｄは、第３導電性多孔質体１１６の矢印Ｂ１側の短辺１１７ｂ及び矢印Ｂ２側の短辺１１７ｂの各々の角接合部１２０ａ同士の間に１個ずつ設けられている。また、角接合部１２０ａと該角接合部１２０ａに隣接する短辺接合部１２０ｄとの間に形成される短辺区間のそれぞれの長さは、互いに同じＬｃとなっている。   120 d of short side junction parts are provided in the position which divides | segments between the corner junction parts 120a of the short sides 117b of the 3rd electroconductive porous body 116 into a some short side area. In the present embodiment, one short side joint 120d is provided between each corner joint 120a of the short side 117b on the arrow B1 side and the short side 117b on the arrow B2 side of the third conductive porous body 116. Is provided. The lengths of the short side sections formed between the corner joint 120a and the short side joint 120d adjacent to the corner joint 120a are the same Lc.

角接合部１２０ａと該角接合部１２０ａに隣接する近接接合部１２０ｂとの間隔Ｌａと、長辺区間の長さＬｂと、短辺区間の長さＬｃとは、Ｌａ＜Ｌｃ＜Ｌｂの関係が成り立つように設定されている。   The distance La between the corner joint 120a and the adjacent joint 120b adjacent to the corner joint 120a, the length Lb of the long side section, and the length Lc of the short side section have a relationship of La <Lc <Lb. It is set to hold.

図１０に示すように、第２接合部１２０は、例えば、ダミー樹脂枠部材１１１に対して、その外周縁部８２ｂの内周端を周回し且つ矢印Ａ２側に突出するように一体成形された樹脂突起部１２０ｅを部分的に加熱変形させて構成することができる。この第２接合部１２０は、第２樹脂含浸部１２０ｆと、第２溶融凝固部１２０ｇとから形成される。なお、樹脂突起部１２０ｅのうち、第２接合部１２０を構成しない部分、換言すると、加熱変形させずに残存した部分は、機械加工等により除去してもよい。   As shown in FIG. 10, for example, the second joint portion 120 is integrally formed with respect to the dummy resin frame member 111 so as to go around the inner peripheral end of the outer peripheral edge portion 82 b and protrude toward the arrow A <b> 2 side. The resin protrusion 120e can be configured by being partially heated and deformed. The second joint 120 is formed of a second resin impregnated portion 120f and a second melt-solidified portion 120g. Note that a portion of the resin protrusion 120e that does not constitute the second bonding portion 120, in other words, a portion that remains without being thermally deformed may be removed by machining or the like.

第２樹脂含浸部１２０ｆは、溶融した樹脂突起部１２０ｅを、第３導電性多孔質体１１６の外周縁部に含浸させることで形成される。第２溶融凝固部１２０ｇは、互いに離間して配置された樹脂枠部材８２の第１段差面８２ｄと、第３導電性多孔質体１１６の外周端面１１６ｂとの間に、溶融させた樹脂突起部１２０ｅを流入させて凝固させることで形成される。図１０では、第２溶融凝固部１２０ｇと一体化した棚部８２ｅの表面及び第１段差面８２ｄを二点鎖線で示す。   The second resin impregnated portion 120f is formed by impregnating the outer peripheral edge portion of the third conductive porous body 116 with the molten resin protrusion 120e. The second melt-solidified portion 120g is a resin projection that is melted between the first step surface 82d of the resin frame member 82 that is spaced apart from the outer peripheral end surface 116b of the third conductive porous body 116. It is formed by allowing 120e to flow and solidify. In FIG. 10, the surface of the shelf 82e integrated with the second melt-solidified portion 120g and the first step surface 82d are indicated by a two-dot chain line.

なお、第１接合部１００及び第２接合部１２０は、樹脂突起部１００ａ、１２０ｅに代え、樹脂枠部材８２及びダミー樹脂枠部材１１１とは別体からなる樹脂片（不図示）を溶融させて、第２ガス拡散層９６及び第３導電性多孔質体１１６の外周縁部にそれぞれ含浸させることで形成してもよい。また、第１接合部１００及び第２接合部１２０は、接着剤層９８と同様に、接着剤９８ａを使用してもよい。   In addition, the 1st junction part 100 and the 2nd junction part 120 are replaced with the resin protrusion parts 100a and 120e, and melt | dissolved the resin piece (not shown) which is a different body from the resin frame member 82 and the dummy resin frame member 111. The outer peripheral edge portions of the second gas diffusion layer 96 and the third conductive porous body 116 may be impregnated, respectively. In addition, the first bonding part 100 and the second bonding part 120 may use an adhesive 98 a similarly to the adhesive layer 98.

図２、図３、図５及び図１２に示すように、ダミー第１セパレータ１０８は、燃料ガス供給孔部７２ａに代えて入口遮断部１２２ａが設けられ、燃料ガス排出孔部７２ｂに代えて出口遮断部１２２ｂが設けられていることを除いて第２セパレータ３６と同様に構成されている。つまり、ダミー第１セパレータ１０８の他端側（矢印Ａ２側）の面１０８ｂは、図４に示す第１セパレータ３２の他端側（矢印Ａ２側）の面３２ｂと同様に構成することができる。   As shown in FIGS. 2, 3, 5 and 12, the dummy first separator 108 is provided with an inlet blocking portion 122a instead of the fuel gas supply hole 72a, and an outlet instead of the fuel gas discharge hole 72b. It is configured in the same manner as the second separator 36 except that the blocking part 122b is provided. That is, the surface 108b on the other end side (arrow A2 side) of the dummy first separator 108 can be configured similarly to the surface 32b on the other end side (arrow A2 side) of the first separator 32 shown in FIG.

図２及び図４に示すように、ダミー第１セパレータ１０８の他端側（矢印Ａ２側）の面１０８ｂと樹脂枠付きＭＥＡ３４のカソード電極８６側（矢印Ａ１側）との間には、酸化剤ガス流路５６に対応する第１空間１２４が設けられる。図４に示すように、第１空間１２４は、入口連結溝６２ａ及び出口連結溝６２ｂ内に形成された連通路１２５を介して、酸化剤ガス入口連通孔４０と酸化剤ガス出口連通孔４６とに連通する。このため、酸化剤ガス流路５６と同様に酸化剤ガスが流通可能となっている。   As shown in FIGS. 2 and 4, an oxidant is provided between the other end side (arrow A2 side) 108b of the dummy first separator 108 and the cathode electrode 86 side (arrow A1 side) of the MEA 34 with resin frame. A first space 124 corresponding to the gas flow path 56 is provided. As shown in FIG. 4, the first space 124 has an oxidant gas inlet communication hole 40, an oxidant gas outlet communication hole 46, and a communication path 125 formed in the inlet connection groove 62 a and the outlet connection groove 62 b. Communicate with. For this reason, the oxidant gas can be circulated similarly to the oxidant gas flow path 56.

図２及び図１２に示すように、ダミー第１セパレータ１０８の一端側（矢印Ａ１側）の面１０８ａと樹脂枠付きダミー構造体１０６の第３導電性多孔質体１１６側（矢印Ａ２側）との間には、燃料ガス流路６６に対応する第２空間１２６が設けられる。第２空間１２６は、入口遮断部１２２ａにより、燃料ガス入口連通孔４４と遮断されるとともに、出口遮断部１２２ｂにより、燃料ガス出口連通孔４２と遮断される。つまり、入口遮断部１２２ａ及び出口遮断部１２２ｂ（以下、これらを総称して遮断部ともいう）により、第２空間１２６に燃料ガスが流れることが規制されるため、該第２空間１２６の内部には断熱空間が形成される。   As shown in FIG. 2 and FIG. 12, the surface 108a on one end side (arrow A1 side) of the dummy first separator 108, the third conductive porous body 116 side (arrow A2 side) of the dummy structure 106 with a resin frame, A second space 126 corresponding to the fuel gas flow channel 66 is provided between them. The second space 126 is blocked from the fuel gas inlet communication hole 44 by the inlet blocking part 122a, and is blocked from the fuel gas outlet communication hole 42 by the outlet blocking part 122b. That is, the flow of fuel gas to the second space 126 is restricted by the inlet blocking portion 122a and the outlet blocking portion 122b (hereinafter also collectively referred to as a blocking portion). An adiabatic space is formed.

なお、入口遮断部１２２ａ及び出口遮断部１２２ｂの何れか一方のみを設けることによって、第２空間１２６に燃料ガスが流れることを規制し、断熱空間を形成してもよい。また、本実施形態では、遮断部は、ダミー第１セパレータ１０８に燃料ガス供給孔部７２ａ及び燃料ガス排出孔部７２ｂ（図３参照）を貫通形成しないことで構成される。しかしながら、特にこれに限定されるものではなく、例えば、遮断部は、ダミー第１セパレータ１０８に貫通形成された燃料ガス供給孔部７２ａ及び燃料ガス排出孔部７２ｂを閉塞して構成することも可能である。図１２に示すように、ダミー第１セパレータ１０８の面１０８ａには、第２空間１２６を囲んで、その内部を面方向の外部とシールするシール部材１２７が設けられている。   In addition, by providing only one of the inlet blocking part 122a and the outlet blocking part 122b, the flow of the fuel gas to the second space 126 may be restricted and the heat insulating space may be formed. Further, in the present embodiment, the blocking portion is configured by not penetrating and forming the fuel gas supply hole 72a and the fuel gas discharge hole 72b (see FIG. 3) in the dummy first separator 108. However, the present invention is not particularly limited to this, and for example, the blocking portion may be configured by closing the fuel gas supply hole portion 72a and the fuel gas discharge hole portion 72b formed through the dummy first separator 108. It is. As shown in FIG. 12, a seal member 127 is provided on the surface 108 a of the dummy first separator 108 so as to surround the second space 126 and seal the inside thereof with the outside in the surface direction.

図２に示すように、第１ダミーセル１８は、矢印Ａ１側から矢印Ａ２側に向かって、第１セパレータ３２（ダミーセパレータ）と、樹脂枠付きダミー構造体１０６と、ダミー第１セパレータ１０８（ダミーセパレータ）と、樹脂枠付きダミー構造体１０６と、ダミー第２セパレータ１３０（ダミーセパレータ）とが、この順に積層されて構成される。   As shown in FIG. 2, the first dummy cell 18 includes a first separator 32 (dummy separator), a dummy structure 106 with a resin frame, and a dummy first separator 108 (dummy) from the arrow A1 side to the arrow A2 side. A separator), a dummy structure 106 with a resin frame, and a dummy second separator 130 (dummy separator) are stacked in this order.

図２、図３及び図１２に示すように、ダミー第２セパレータ１３０は、燃料ガス供給孔部７２ａに代えて入口遮断部１２２ａが設けられ、燃料ガス排出孔部７２ｂに代えて出口遮断部１２２ｂが設けられていることを除いて第３セパレータ３８と同様に構成されている。   As shown in FIGS. 2, 3 and 12, the dummy second separator 130 is provided with an inlet blocking part 122a instead of the fuel gas supply hole 72a, and an outlet blocking part 122b instead of the fuel gas discharge hole 72b. Is configured in the same manner as the third separator 38 except that is provided.

つまり、図２、図３及び図６に示すように、ダミー第２セパレータ１３０の他端側（矢印Ａ２側）の面１３０ｂは、シール部材７１で囲われた燃料ガス供給孔部７２ａ及び燃料ガス排出孔部７２ｂが設けられていないことを除いて、第３セパレータ３８の矢印Ａ２側の面３８ｂと同様に構成される。このため、ダミー第２セパレータ１３０の面１３０ｂは、図３に示す第１セパレータ３２の一端側（矢印Ａ１側）の面３２ａと同様に構成することができる。また、図２及び図１１に示すように、ダミー第２セパレータ１３０の矢印Ａ１側の面１３０ａは、ダミー第１セパレータ１０８の矢印Ａ１側の面１０８ａと同様に構成される。   That is, as shown in FIGS. 2, 3, and 6, the surface 130 b on the other end side (arrow A <b> 2 side) of the dummy second separator 130 has the fuel gas supply hole 72 a surrounded by the seal member 71 and the fuel gas. Except that the discharge hole 72b is not provided, the third separator 38 is configured in the same manner as the surface 38b on the arrow A2 side. Therefore, the surface 130b of the dummy second separator 130 can be configured similarly to the surface 32a on one end side (arrow A1 side) of the first separator 32 shown in FIG. As shown in FIGS. 2 and 11, the surface 130 a on the arrow A <b> 1 side of the dummy second separator 130 is configured similarly to the surface 108 a on the arrow A <b> 1 side of the dummy first separator 108.

図２に示すように、第１ダミーセル１８では、ダミー第２セパレータ１３０の矢印Ａ２側の面１３０ｂと第１端部発電ユニット１６の第１セパレータ３２との間に、冷却媒体流路５２が設けられる。図２及び図１１に示すように、第１ダミーセル１８では、ダミー第２セパレータ１３０の矢印Ａ１側の面（１３０ａ）と樹脂枠付きダミー構造体１０６の第３導電性多孔質体１１６側（矢印Ａ２側）との間に、燃料ガス流路６６に対応する第２空間１２６が設けられる。   As shown in FIG. 2, in the first dummy cell 18, a cooling medium flow path 52 is provided between the surface 130 b on the arrow A <b> 2 side of the dummy second separator 130 and the first separator 32 of the first end power generation unit 16. It is done. 2 and 11, in the first dummy cell 18, the surface (130a) of the dummy second separator 130 on the arrow A1 side and the third conductive porous body 116 side of the dummy structure 106 with a resin frame (arrow) A second space 126 corresponding to the fuel gas channel 66 is provided between the second space 126 and the A2 side).

第２ダミーセル２０は、矢印Ａ１側から矢印Ａ２側に向かって、第１セパレータ３２（ダミーセパレータ）、樹脂枠付きダミー構造体１０６、ダミー第２セパレータ１３０（ダミーセパレータ）の順に積層される。このため、第２ダミーセル２０では、ダミー第２セパレータ１３０の矢印Ａ１側の面１３０ａと樹脂枠付きダミー構造体１０６の第３導電性多孔質体１１６側（矢印Ａ２側）との間に第２空間１２６が設けられる。第３ダミーセル２４は、第２ダミーセル２０と同様に構成される。   The second dummy cell 20 is laminated in the order of the first separator 32 (dummy separator), the dummy structure with resin frame 106, and the dummy second separator 130 (dummy separator) from the arrow A1 side to the arrow A2 side. For this reason, in the second dummy cell 20, a second gap is formed between the surface 130a on the arrow A1 side of the dummy second separator 130 and the third conductive porous body 116 side (arrow A2 side) of the dummy structure 106 with a resin frame. A space 126 is provided. The third dummy cell 24 is configured similarly to the second dummy cell 20.

第２端部発電ユニット２２は、矢印Ａ１側からＡ２側に向かって、第１セパレータ３２と、樹脂枠付きＭＥＡ３４と、第２セパレータ３６と、樹脂枠付きダミー構造体１０６と、ダミー第２セパレータ１３０とが、この順に積層されて構成される。このため、第２端部発電ユニット２２では、ダミー第２セパレータ１３０の矢印Ａ１側の面１３０ａと樹脂枠付きダミー構造体１０６の第３導電性多孔質体１１６側（矢印Ａ２側）との間に第２空間１２６が設けられる。   The second end power generation unit 22 includes a first separator 32, an MEA 34 with a resin frame, a second separator 36, a dummy structure 106 with a resin frame, and a dummy second separator from the arrow A1 side toward the A2 side. 130 are stacked in this order. Therefore, in the second end power generation unit 22, the space between the surface 130a on the arrow A1 side of the dummy second separator 130 and the third conductive porous body 116 side (arrow A2 side) of the dummy structure 106 with a resin frame. A second space 126 is provided.

ターミナルプレート２６ａ、２６ｂは、電気導電性を有する材料から構成され、例えば、銅、アルミニウム又はステンレススチール等の金属で構成される。図１に示すように、ターミナルプレート２６ａ、２６ｂの略中央には、積層方向外方に延在する端子部１３２ａ、１３２ｂがそれぞれ設けられる。   The terminal plates 26a and 26b are made of a material having electrical conductivity, and are made of a metal such as copper, aluminum, or stainless steel, for example. As shown in FIG. 1, terminal portions 132a and 132b extending outward in the stacking direction are provided at substantially the center of the terminal plates 26a and 26b, respectively.

端子部１３２ａは、絶縁性筒体１３４ａに挿入されてインシュレータ２８ａの孔部１３６ａ及びエンドプレート３０ａの孔部１３８ａを貫通し、該エンドプレート３０ａの外部に突出する。端子部１３２ｂは、絶縁性筒体１３４ｂに挿入されてインシュレータ２８ｂの孔部１３６ｂ及びエンドプレート３０ｂの孔部１３８ｂを貫通し、該エンドプレート３０ｂの外部に突出する。   The terminal portion 132a is inserted into the insulating cylinder 134a, passes through the hole portion 136a of the insulator 28a and the hole portion 138a of the end plate 30a, and protrudes outside the end plate 30a. The terminal portion 132b is inserted into the insulating cylinder 134b, passes through the hole portion 136b of the insulator 28b and the hole portion 138b of the end plate 30b, and protrudes outside the end plate 30b.

インシュレータ２８ａ、２８ｂは、絶縁性材料、例えば、ポリカーボネート（ＰＣ）やフェノール樹脂等で形成される。インシュレータ２８ａ、２８ｂの中央部には、積層体１４に向かって開口される凹部１４０ａ、１４０ｂが形成され、該凹部１４０ａ、１４０ｂは、孔部１３６ａ、１３６ｂに連通する。   The insulators 28a and 28b are formed of an insulating material such as polycarbonate (PC) or phenol resin. In the central portions of the insulators 28a and 28b, recesses 140a and 140b that open toward the laminated body 14 are formed, and the recesses 140a and 140b communicate with the holes 136a and 136b.

インシュレータ２８ａ及びエンドプレート３０ａには、反応ガス連通孔が設けられる。一方、インシュレータ２８ｂ及びエンドプレート３０ｂには、冷却媒体入口連通孔４８及び冷却媒体出口連通孔５０が設けられる。   The insulator 28a and the end plate 30a are provided with reaction gas communication holes. On the other hand, the cooling medium inlet communication hole 48 and the cooling medium outlet communication hole 50 are provided in the insulator 28b and the end plate 30b.

凹部１４０ａには、ターミナルプレート２６ａ及び断熱体１４２が収容され、凹部１４０ｂには、ターミナルプレート２６ｂ及び断熱体１４２が収容される。断熱体１４２は、一対の電気伝導性を有する断熱プレート１４４間に電気伝導性を有する断熱部材１４６が挟持されて構成される。断熱プレート１４４は、例えば、平坦な形状を有する多孔性カーボンプレートで構成されるとともに、断熱部材１４６は、断面波板状の金属製のプレートで構成される。   The terminal plate 26a and the heat insulator 142 are accommodated in the recess 140a, and the terminal plate 26b and the heat insulator 142 are accommodated in the recess 140b. The heat insulator 142 is configured by sandwiching a heat insulating member 146 having electric conductivity between a pair of heat insulating plates 144 having electric conductivity. The heat insulating plate 144 is formed of, for example, a porous carbon plate having a flat shape, and the heat insulating member 146 is formed of a metal plate having a corrugated cross section.

なお、断熱プレート１４４は、断熱部材１４６と同一の材料で構成してもよい。また、断熱体１４２は、１枚の断熱プレート１４４と１枚の断熱部材１４６とを備えてもよい。さらに、ターミナルプレート２６ａ、２６ｂと、インシュレータ２８ａ、２８ｂの凹部１４０ａ、１４０ｂの底部との間に、樹脂製スペーサ（不図示）を介装してもよい。   The heat insulating plate 144 may be made of the same material as the heat insulating member 146. Further, the heat insulator 142 may include one heat insulating plate 144 and one heat insulating member 146. Further, a resin spacer (not shown) may be interposed between the terminal plates 26a, 26b and the bottoms of the recesses 140a, 140b of the insulators 28a, 28b.

燃料電池スタック１０は、基本的には上記のように構成される。以下、本実施形態に係るダミーセルの製造方法について、燃料電池スタック１０の第１ダミーセル１８を得る場合を例に挙げて説明する。   The fuel cell stack 10 is basically configured as described above. Hereinafter, the manufacturing method of the dummy cell according to the present embodiment will be described by taking as an example the case of obtaining the first dummy cell 18 of the fuel cell stack 10.

先ず、図１１に示すように、第１導電性多孔質体１１２と、第２導電性多孔質体１１４と、第３導電性多孔質体１１６とを、各層間に接着剤層１１８ａ又は接着剤層１１８ｂ（図１０参照）を設けつつ積層する第１積層工程を行う。これによってダミー構造体１１０を得ることができる。   First, as shown in FIG. 11, a first conductive porous body 112, a second conductive porous body 114, and a third conductive porous body 116 are bonded to each other with an adhesive layer 118a or an adhesive. A first stacking step of stacking layers 118b (see FIG. 10) is performed. Thereby, the dummy structure 110 can be obtained.

次に、図９及び図１０に示す通り、ダミー構造体１１０の外周を周回するようにダミー樹脂枠部材１１１を配置する。具体的には、第３導電性多孔質体１１６の外周露呈部１１６ａの矢印Ａ１側をダミー樹脂枠部材１１１の棚部８２ｅに重ね、第２導電性多孔質体１１４の外周露呈部１１４ｂをダミー樹脂枠部材１１１の溝部８２ｈａに臨ませ、第１導電性多孔質体１１２の外周端面１１２ａをダミー樹脂枠部材１１１の内周端面８２ｉに対向させる。   Next, as shown in FIGS. 9 and 10, the dummy resin frame member 111 is arranged so as to go around the outer periphery of the dummy structure 110. Specifically, the arrow A1 side of the outer peripheral exposed portion 116a of the third conductive porous body 116 is overlapped with the shelf 82e of the dummy resin frame member 111, and the outer peripheral exposed portion 114b of the second conductive porous body 114 is a dummy. The outer peripheral end surface 112a of the first conductive porous body 112 faces the inner peripheral end surface 82i of the dummy resin frame member 111 so as to face the groove portion 82ha of the resin frame member 111.

そして、図１０に示すように、ダミー樹脂枠部材１１１に設けられた樹脂突起部１２０ｅを接合装置１５０により加熱しつつ荷重を付与して変形させることで、第２樹脂含浸部１２０ｆ及び第２溶融凝固部１２０ｇからなる第２接合部１２０を形成する。接合装置１５０は、例えば、基台（金型）１５２と、該基台１５２に対して進退自在な可動金型１５４とを備える。本実施形態では、可動金型１５４の樹脂突起部１２０ｅに当接する当接面１５４ａは円形状であり、この可動金型１５４を用いることで、図９に示すように、平面視で円形状の第２接合部１２０が形成されることとする。しかしながら、可動金型１５４の当接面１５４ａの形状及び第２接合部１２０の平面視の形状は、特に円形状に限定されるものではない。例えば、四角形状や、他の多角形状でもよい。   Then, as shown in FIG. 10, the resin protrusion 120 e provided on the dummy resin frame member 111 is deformed by applying a load while being heated by the bonding device 150, so that the second resin impregnated portion 120 f and the second melted portion are melted. The 2nd junction part 120 which consists of coagulation | solidification part 120g is formed. The joining device 150 includes, for example, a base (die) 152 and a movable die 154 that can move forward and backward with respect to the base 152. In the present embodiment, the contact surface 154a that contacts the resin protrusion 120e of the movable mold 154 has a circular shape. By using this movable mold 154, as shown in FIG. The 2nd junction part 120 shall be formed. However, the shape of the contact surface 154a of the movable mold 154 and the shape of the second joint 120 in plan view are not particularly limited to a circular shape. For example, a rectangular shape or other polygonal shapes may be used.

図１０に示すように、基台１５２に、ダミー構造体１１０の第１導電性多孔質体１１２側及びダミー樹脂枠部材１１１の矢印Ａ１側の面を載置する。これによって、樹脂突起部１２０ｅが可動金型１５４側に向かって配置される。   As shown in FIG. 10, the surface of the dummy structure 110 on the first conductive porous body 112 side and the dummy resin frame member 111 on the arrow A1 side is placed on the base 152. Thereby, the resin protrusion 120e is arranged toward the movable mold 154 side.

次に、可動金型１５４を所定の温度に加熱した状態で基台１５２に接近させ、該可動金型１５４の当接面１５４ａを樹脂突起部１２０ｅに当接させることで、該樹脂突起部１２０ｅを加熱及び加圧する。これによって溶融した樹脂突起部１２０ｅは、可動金型１５４の当接面１５４ａに沿って矢印Ｃ方向に広がり、樹脂枠部材８２の第１段差面８２ｄと第３導電性多孔質体１１６の外周端面１１６ｂとの間に流入することで第２溶融凝固部１２０ｇが形成される。また、溶融した樹脂突起部１２０ｅが、第３導電性多孔質体１１６の外周縁部に含浸することで第２樹脂含浸部１２０ｆが形成される。   Next, the movable mold 154 is heated to a predetermined temperature and brought close to the base 152, and the contact surface 154a of the movable mold 154 is brought into contact with the resin projection 120e, whereby the resin projection 120e. Is heated and pressurized. The melted resin protrusion 120e spreads in the direction of arrow C along the contact surface 154a of the movable mold 154, and the first step surface 82d of the resin frame member 82 and the outer peripheral end surface of the third conductive porous body 116. The second molten and solidified portion 120g is formed by flowing between the first and second portions 116b. In addition, the second resin impregnated portion 120f is formed by impregnating the outer peripheral edge portion of the third conductive porous body 116 with the melted resin protrusion 120e.

この際、樹脂突起部１２０ｅを加熱変形させる位置を調整することで、第２接合部１２０が、角接合部１２０ａと、近接接合部１２０ｂと、長辺接合部１２０ｃと、短辺接合部１２０ｄとを有するように調整する。例えば、樹脂突起部１２０ｅを小さい荷重で変形可能とする観点からは、可動金型１５４を順次移動させて、上記の配置となるように第２接合部１２０をそれぞれ形成することが好ましい。一方、第２接合部１２０を効率的に形成可能とする観点からは、複数の可動金型１５４の当接面１５４ａのそれぞれを、樹脂突起部１２０ｅの加熱変形させる複数の位置に略同時に当接させて、上記の配置となるように第２接合部１２０を形成することが好ましい。   At this time, by adjusting the position where the resin protrusion 120e is heated and deformed, the second joint 120 becomes a corner joint 120a, a proximity joint 120b, a long side joint 120c, and a short side joint 120d. Adjust to have For example, from the viewpoint of allowing the resin protrusion 120e to be deformed with a small load, it is preferable to sequentially move the movable mold 154 to form the second joints 120 so as to have the above-described arrangement. On the other hand, from the viewpoint of enabling the second joint portion 120 to be formed efficiently, the contact surfaces 154a of the plurality of movable molds 154 are contacted substantially simultaneously with a plurality of positions where the resin protrusion 120e is heated and deformed. Thus, it is preferable to form the second bonding portion 120 so as to have the above arrangement.

なお、樹脂突起部１２０ｅに代え、上記の樹脂片を用いて第２接合部１２０を形成する場合には、ダミー樹脂枠部材１１１及び第３導電性多孔質体１１６の第２接合部１２０を形成する位置と、可動金型１５４の当接面１５４ａとの間に樹脂片を介在させて、該樹脂片を加熱及び加圧して溶融させればよい。   In addition, when forming the 2nd junction part 120 using said resin piece instead of the resin projection part 120e, the 2nd junction part 120 of the dummy resin frame member 111 and the 3rd conductive porous body 116 is formed. A resin piece may be interposed between the position where the contact is made and the contact surface 154a of the movable mold 154, and the resin piece may be heated and pressurized to be melted.

上記のようにして、第２接合部１２０を形成する接合工程を行うことで、ダミー樹脂枠部材１１１の棚部８２ｅと、第３導電性多孔質体１１６の外周縁部とを接合して樹脂枠付きダミー構造体１０６を得ることができる。   As described above, by performing the bonding step of forming the second bonding portion 120, the shelf portion 82e of the dummy resin frame member 111 and the outer peripheral edge portion of the third conductive porous body 116 are bonded to each other. A dummy structure 106 with a frame can be obtained.

上記の第１積層工程及び接合工程によって、２個の樹脂枠付きダミー構造体１０６を得た後、図２に示すように、第１セパレータ３２、樹脂枠付きダミー構造体１０６、ダミー第１セパレータ１０８、樹脂枠付きダミー構造体１０６、ダミー第２セパレータ１３０をこの順に積層する第２積層工程を行う。これによって、第１ダミーセル１８を得ることができる。   After obtaining the two resin frame-equipped dummy structures 106 by the first laminating step and the joining step, as shown in FIG. 2, the first separator 32, the resin frame-equipped dummy structure 106, and the dummy first separator A second stacking step of stacking 108, the dummy structure 106 with a resin frame, and the dummy second separator 130 in this order is performed. Thus, the first dummy cell 18 can be obtained.

なお、第２ダミーセル２０及び第３ダミーセル２４は、第２積層工程の際に、樹脂枠付きダミー構造体１０６を第１セパレータ３２とダミー第２セパレータ１３０で挟持することにより得ることができる。   The second dummy cell 20 and the third dummy cell 24 can be obtained by sandwiching the dummy structure 106 with a resin frame between the first separator 32 and the dummy second separator 130 in the second stacking step.

上記のようにして得られる第１ダミーセル１８、第２ダミーセル２０及び第３ダミーセル２４を備える燃料電池スタック１０の動作について、以下に説明する。先ず、図１に示すように、酸素含有ガス等の酸化剤ガスは、エンドプレート３０ａの酸化剤ガス入口連通孔４０に供給される。水素含有ガス等の燃料ガスは、エンドプレート３０ａの燃料ガス入口連通孔４４に供給される。純水やエチレングリコール、オイル等の冷却媒体は、エンドプレート３０ｂの冷却媒体入口連通孔４８にそれぞれ供給される。   The operation of the fuel cell stack 10 including the first dummy cell 18, the second dummy cell 20, and the third dummy cell 24 obtained as described above will be described below. First, as shown in FIG. 1, an oxidant gas such as an oxygen-containing gas is supplied to the oxidant gas inlet communication hole 40 of the end plate 30a. Fuel gas such as hydrogen-containing gas is supplied to the fuel gas inlet communication hole 44 of the end plate 30a. A cooling medium such as pure water, ethylene glycol, or oil is supplied to the cooling medium inlet communication hole 48 of the end plate 30b.

酸化剤ガス入口連通孔４０に供給された酸化剤ガスは、図４及び図５に示すように、入口連結溝６２ａの内部に形成された連通路１２５を介して酸化剤ガス流路５６及び第１空間１２４に流入する。これによって、酸化剤ガスが、矢印Ｂ１、Ｂ２方向に移動しながら、各電解質膜・電極構造体８０のカソード電極８６と、ダミー構造体１１０の積層方向の一端側（第１導電性多孔質体１１２側、矢印Ａ１側）に供給される。   As shown in FIGS. 4 and 5, the oxidant gas supplied to the oxidant gas inlet communication hole 40 passes through the oxidant gas flow path 56 and the first through the communication path 125 formed in the inlet connection groove 62a. It flows into one space 124. As a result, the oxidant gas moves in the directions of arrows B1 and B2, while the cathode electrode 86 of each electrolyte membrane / electrode structure 80 and one end side in the stacking direction of the dummy structure 110 (first conductive porous body). 112 side, arrow A1 side).

図３に示すように、燃料ガス入口連通孔４４に供給された燃料ガスは、燃料ガス供給孔部７２ａを介して、第２セパレータ３６及び第３セパレータ３８の燃料ガス流路６６にそれぞれ流入する。これによって、燃料ガスが、矢印Ｂ１、Ｂ２方向に移動しながら、各電解質膜・電極構造体８０のアノード電極８８に供給される。一方、図１２に示すように、ダミー第１セパレータ１０８及びダミー第２セパレータ１３０の第２空間１２６には、入口遮断部１２２ａによって燃料ガスの流入が遮断される。   As shown in FIG. 3, the fuel gas supplied to the fuel gas inlet communication hole 44 flows into the fuel gas channel 66 of the second separator 36 and the third separator 38 via the fuel gas supply hole 72a. . As a result, the fuel gas is supplied to the anode electrode 88 of each electrolyte membrane / electrode structure 80 while moving in the directions of arrows B1 and B2. On the other hand, as shown in FIG. 12, the inflow of fuel gas is blocked by the inlet blocking portion 122a into the second space 126 of the dummy first separator 108 and the dummy second separator 130.

上記のようにして反応ガスが供給された電解質膜・電極構造体８０では、各カソード電極８６に供給される酸化剤ガスと、各アノード電極８８に供給される燃料ガスとが、第１電極触媒層９０及び第２電極触媒層９４内で電気化学反応により消費されて発電が行われる。   In the electrolyte membrane / electrode structure 80 supplied with the reaction gas as described above, the oxidant gas supplied to each cathode electrode 86 and the fuel gas supplied to each anode electrode 88 are the first electrode catalyst. In the layer 90 and the second electrode catalyst layer 94, power is generated by being consumed by an electrochemical reaction.

次いで、各カソード電極８６に供給されて一部が消費された酸化剤ガスは、酸化剤ガス流路５６及び第１空間１２４のそれぞれから出口連結溝６２ｂの内部に形成された連通路１２５を介して酸化剤ガス出口連通孔４６に排出される。そして、エンドプレート３０ａの酸化剤ガス出口連通孔４６を介して燃料電池スタック１０の外部に排出される。   Next, the oxidant gas, which is supplied to each cathode electrode 86 and partially consumed, passes from the oxidant gas flow path 56 and the first space 124 through the communication path 125 formed in the outlet connection groove 62b. The oxidant gas outlet communication hole 46 is then discharged. Then, the gas is discharged to the outside of the fuel cell stack 10 through the oxidant gas outlet communication hole 46 of the end plate 30a.

同様に、各アノード電極８８に供給されて一部が消費された燃料ガスは、燃料ガス流路６６から燃料ガス排出孔部７２ｂの内部を介して燃料ガス出口連通孔４２に排出される。そして、エンドプレート３０ａの燃料ガス出口連通孔４２を介して燃料電池スタック１０の外部に排出される。   Similarly, the fuel gas partially consumed by being supplied to each anode electrode 88 is discharged from the fuel gas flow channel 66 to the fuel gas outlet communication hole 42 through the inside of the fuel gas discharge hole 72b. Then, the fuel is discharged outside the fuel cell stack 10 through the fuel gas outlet communication hole 42 of the end plate 30a.

この際、第２空間１２６は、出口遮断部１２２ｂによって燃料ガス出口連通孔４２とも遮断されている。このため、第２空間１２６には、上記の通り、入口遮断部１２２ａによって燃料ガスの流入が遮断されることに加えて、出口遮断部１２２ｂによって燃料ガス出口連通孔４２から燃料ガスが進入することも回避されている。その結果、第２空間１２６は、遮断部によって燃料ガスの流通が遮断され、断熱空間として機能する。   At this time, the second space 126 is also blocked from the fuel gas outlet communication hole 42 by the outlet blocking portion 122b. Therefore, as described above, in addition to the inflow of fuel gas being blocked by the inlet blocking portion 122a, the fuel gas enters the second space 126 from the fuel gas outlet communication hole 42 by the outlet blocking portion 122b. Has also been avoided. As a result, the second space 126 functions as a heat insulating space by blocking the flow of the fuel gas by the blocking portion.

また、各冷却媒体入口連通孔４８に供給された冷却媒体は、互いに隣接するダミー第２セパレータ１３０と第１セパレータ３２間の冷却媒体流路５２、及び互いに隣接する第３セパレータ３８と第１セパレータ３２との間の冷却媒体流路５２に導入される。矢印Ｃ１側の各冷却媒体入口連通孔４８から導入された冷却媒体と、矢印Ｃ２側の冷却媒体入口連通孔４８から導入された冷却媒体は、互いに接近するように矢印Ｃ１、Ｃ２方向に沿って流通してから、矢印Ｂ２側に向かって流通し、電解質膜・電極構造体８０を冷却しながら、互いに離間するように矢印Ｃ１、Ｃ２方向に沿って流通し、各冷却媒体出口連通孔５０から排出される。   The cooling medium supplied to each cooling medium inlet communication hole 48 includes the cooling medium flow path 52 between the dummy second separator 130 and the first separator 32 adjacent to each other, and the third separator 38 and the first separator adjacent to each other. 32 is introduced into the cooling medium flow path 52 between them. The cooling medium introduced from each cooling medium inlet communication hole 48 on the arrow C1 side and the cooling medium introduced from the cooling medium inlet communication hole 48 on the arrow C2 side are along the directions of arrows C1 and C2 so as to approach each other. After flowing, flow toward the arrow B2 side, flow along the directions of arrows C1 and C2 so as to be separated from each other while cooling the electrolyte membrane / electrode structure 80, and from each cooling medium outlet communication hole 50 Discharged.

以上から、本実施形態に係る燃料電池スタック１０の各ダミーセル（第１ダミーセル１８、第２ダミーセル２０、第３ダミーセル２４）は、発電セル１２の電解質膜・電極構造体８０に対応してダミー構造体１１０を備える。つまり、各ダミーセルは、電解質膜８４や第１電極触媒層９０及び第２電極触媒層９４を備えていないため、発電を行うことがなく、発電による生成水も生じない。これによって、各ダミーセル自体が断熱層として機能するとともに、各ダミーセルで結露が生じることを抑制できる。   From the above, each dummy cell (first dummy cell 18, second dummy cell 20, third dummy cell 24) of the fuel cell stack 10 according to the present embodiment corresponds to the electrolyte membrane / electrode structure 80 of the power generation cell 12. A body 110 is provided. That is, since each dummy cell does not include the electrolyte membrane 84, the first electrode catalyst layer 90, and the second electrode catalyst layer 94, power generation is not performed, and water generated by power generation is not generated. Thereby, each dummy cell itself functions as a heat insulation layer, and it can suppress that dew condensation occurs in each dummy cell.

このような第１ダミーセル１８及び第２ダミーセル２０を積層体１４の矢印Ａ１側の端部に配設し、第３ダミーセル２４を積層体１４の矢印Ａ２側の端部に配設することで、積層体１４の端部側の断熱性を高めることができる。このため、低温環境下においても、積層体１４の端部側の温度が中央側に比して低温となることを抑制できる。   By disposing the first dummy cell 18 and the second dummy cell 20 at the end of the stacked body 14 on the arrow A1 side, and disposing the third dummy cell 24 at the end of the stacked body 14 on the arrow A2 side, The heat insulation on the end side of the laminate 14 can be enhanced. For this reason, it can suppress that the temperature of the edge part side of the laminated body 14 becomes low temperature compared with the center side also in a low temperature environment.

さらに、積層体１４の端部側の断熱性を高めることができるため、燃料電池スタック１０を氷点下環境で始動する場合であっても、積層体１４の全体を有効に昇温させることができる。これによって、積層体１４の端部側で生成水等が凍結して、電圧低下が生じることを抑制できる。   Furthermore, since the heat insulation on the end side of the stacked body 14 can be improved, even when the fuel cell stack 10 is started in a sub-freezing environment, the entire stacked body 14 can be effectively heated. As a result, it is possible to suppress the generation of water or the like from freezing on the end side of the laminate 14 and causing a voltage drop.

上記のように、発電を行わない各ダミーセルでは、クロスリーク等を抑制する必要がない。このため、ダミー構造体１１０の第３導電性多孔質体１１６の外周の周方向に断続的に第２接合部１２０を設けることでダミー構造体１１０とダミー樹脂枠部材１１１との接合工程を簡素化して、効率的に各ダミーセルを得ることが可能になる。   As described above, it is not necessary to suppress cross leak or the like in each dummy cell that does not generate power. For this reason, the joining process of the dummy structure 110 and the dummy resin frame member 111 is simplified by providing the second joint 120 intermittently in the circumferential direction of the outer periphery of the third conductive porous body 116 of the dummy structure 110. Thus, each dummy cell can be obtained efficiently.

このように、接合工程を簡素化しても、第２接合部１２０が角接合部１２０ａと近接接合部１２０ｂとを有することで、ダミー構造体１１０とダミー樹脂枠部材１１１と接合強度を十分な大きさとすることができる。また、第２接合部１２０が第３導電性多孔質体１１６に接着樹脂を含浸させて形成された第２樹脂含浸部１２０ｆを有するため、例えば、ダミー樹脂枠部材１１１と第３導電性多孔質体１１６の間にのみ接着剤（不図示）を介在させる場合に比して、ダミー構造体１１０とダミー樹脂枠部材１１１とを高強度に接合することができる。これらによって、各ダミーセルの高品質化を図ることができる。   Thus, even if the joining process is simplified, the second joint 120 has the corner joint 120a and the proximity joint 120b, so that the joint structure 110 and the dummy resin frame member 111 have a sufficiently large joint strength. It can be. In addition, since the second bonding portion 120 includes the second resin impregnated portion 120f formed by impregnating the third conductive porous body 116 with the adhesive resin, for example, the dummy resin frame member 111 and the third conductive porous member Compared to the case where an adhesive (not shown) is interposed only between the bodies 116, the dummy structure 110 and the dummy resin frame member 111 can be bonded with high strength. As a result, the quality of each dummy cell can be improved.

第２接合部１２０を形成するべく、ダミー樹脂枠部材１１１に設けられた樹脂突起部１２０ｅを加熱しつつ荷重を付与して変形させる際、該第２接合部１２０の周囲のダミー樹脂枠部材１１１も比較的高温となる。上記のように断続的に第２接合部１２０を設けることで、例えば、第３導電性多孔質体１１６を周回するように第２接合部１２０を設ける場合に比して、ダミー樹脂枠部材１１１の高温となる部分を縮小できる。その結果、ダミー樹脂枠部材１１１に加熱による反り等が生じることを抑制できるため、これによっても各ダミーセルを高品質に得ることができる。   When the resin protrusion 120e provided on the dummy resin frame member 111 is deformed by applying a load while heating to form the second joint 120, the dummy resin frame member 111 around the second joint 120 is formed. Will also be relatively hot. By providing the second bonding portion 120 intermittently as described above, for example, the dummy resin frame member 111 is compared to the case where the second bonding portion 120 is provided so as to go around the third conductive porous body 116. The portion where the temperature becomes high can be reduced. As a result, the dummy resin frame member 111 can be prevented from warping due to heating and the like, so that each dummy cell can be obtained with high quality.

以上から、この燃料電池スタック１０によれば、簡素な工程で効率的且つ高品質に得られる各ダミーセルにより発電安定性を向上させることができる。   As described above, according to the fuel cell stack 10, the power generation stability can be improved by the dummy cells obtained efficiently and with high quality by a simple process.

また、上記の実施形態では、第３導電性多孔質体１１６の外周縁部に第２接合部１２０を設け、第１導電性多孔質体１１２や第２導電性多孔質体１１４に第２接合部１２０を設けないこととした。これによっても、ダミー構造体１１０とダミー樹脂枠部材１１１との接合工程を簡素化できるとともに、ダミー樹脂枠部材１１１に加熱による反り等が生じることを抑制できる。さらに、この場合、樹脂枠付きダミー構造体１０６の矢印Ａ２側の面についてのみ、ダミー構造体１１０とダミー樹脂枠部材１１１とが規定の接合強度で接合されているか否かを検査する検査工程を行えばよい。従って、例えば、樹脂枠付きダミー構造体１０６の両面についてそれぞれ上記の検査を行う場合に比して、検査工程を簡略化することが可能になる。   In the above embodiment, the second joint 120 is provided on the outer peripheral edge of the third conductive porous body 116, and the second joint is attached to the first conductive porous body 112 and the second conductive porous body 114. The part 120 was not provided. This also simplifies the joining process between the dummy structure 110 and the dummy resin frame member 111, and can suppress the occurrence of warpage or the like due to heating in the dummy resin frame member 111. Further, in this case, an inspection process for inspecting whether or not the dummy structure 110 and the dummy resin frame member 111 are bonded with a prescribed bonding strength only on the surface on the arrow A2 side of the dummy structure 106 with a resin frame. Just do it. Therefore, for example, the inspection process can be simplified as compared with the case where the above-described inspection is performed on both surfaces of the dummy structure 106 with a resin frame.

燃料電池スタック１０では、第２接合部１２０は、長辺接合部１２０ｃと、短辺接合部１２０ｄと、をさらに有し、長辺区間のそれぞれの長さＬｂが、短辺区間のそれぞれの長さＬｃよりも大きいこととした。これによって、ダミー構造体１１０とダミー樹脂枠部材１１１とを効率的に接合すること、及び十分な強度で接合することの両立を良好に図ることが可能になる。   In the fuel cell stack 10, the second joint 120 further includes a long side joint 120c and a short side joint 120d, and each length Lb of the long side section is equal to each length of the short side section. It was decided that it was larger than Lc. As a result, it is possible to satisfactorily achieve both the efficient joining of the dummy structure 110 and the dummy resin frame member 111 and the joining with sufficient strength.

燃料電池スタック１０では、複数の長辺区間の長さＬｂが互いに等しく、複数の短辺区間の長さＬｂが互いに等しいこととした。また、角接合部１２０ａと該角接合部１２０ａに隣接する近接接合部１２０ｂとの間隔Ｌａと、長辺区間の長さＬｂと、短辺区間の長さＬｃとの間に、Ｌａ＜Ｌｃ＜Ｌｂの関係が成り立つこととした。これらによって、ダミー構造体１１０とダミー樹脂枠部材１１１との接合工程を簡素化しつつ、ダミー構造体１１０とダミー樹脂枠部材１１１との接合強度を効果的に高めて、より高品質に各ダミーセルを得ることが可能になる。   In the fuel cell stack 10, the lengths Lb of the plurality of long side sections are equal to each other, and the lengths Lb of the plurality of short side sections are equal to each other. Further, La <Lc <between the interval La between the corner joint 120a and the adjacent joint 120b adjacent to the corner joint 120a, the length Lb of the long side section, and the length Lc of the short side section. The relationship of Lb was established. As a result, the bonding process between the dummy structure 110 and the dummy resin frame member 111 is simplified, and the bonding strength between the dummy structure 110 and the dummy resin frame member 111 is effectively increased, so that each dummy cell can be improved in quality. It becomes possible to obtain.

燃料電池スタック１０では、ダミー樹脂枠部材１１１の一部として樹脂突起部１２０ｅを溶融させて第３導電性多孔質体１１６に含浸させる簡素な工程で、第２接合部１２０を良好且つ効率的に形成することができる。従って、ダミー構造体１１０とダミー樹脂枠部材１１１との接合強度を高めた各ダミーセルを効率的に得ることができる。   In the fuel cell stack 10, the second joint 120 is satisfactorily and efficiently obtained by a simple process of melting the resin protrusion 120 e as a part of the dummy resin frame member 111 and impregnating the third conductive porous body 116. Can be formed. Therefore, it is possible to efficiently obtain each dummy cell with increased bonding strength between the dummy structure 110 and the dummy resin frame member 111.

本発明は、上記した実施形態に特に限定されるものではなく、その要旨を逸脱しない範囲で種々の変形が可能である。   The present invention is not particularly limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

長辺接合部１２０ｃ及び短辺接合部１２０ｄの個数や配置は特に限定されるものではなく、第３導電性多孔質体１１６の長辺１１７ａ及び短辺１１７ｂの長さや、第２接合部１２０の径等に応じて適宜設定することができる。また、複数の長辺区間は互いに同じ長さでなくてもよく、複数の短辺区間は互いに同じ長さでなくてもよい。   The number and arrangement of the long side joint 120c and the short side joint 120d are not particularly limited, and the length of the long side 117a and the short side 117b of the third conductive porous body 116, the length of the second joint 120, and the like. It can set suitably according to a diameter etc. Further, the plurality of long side sections may not have the same length, and the plurality of short side sections may not have the same length.

上記の実施形態に係る燃料電池スタック１０では、積層体１４の矢印Ａ１側に第１端部発電ユニット１６と、第１ダミーセル１８と、第２ダミーセル２０とを積層し、積層体１４の矢印Ａ１側に第２端部発電ユニット２２と、第３ダミーセル２４とを積層することとした。   In the fuel cell stack 10 according to the above-described embodiment, the first end power generation unit 16, the first dummy cell 18, and the second dummy cell 20 are stacked on the arrow A1 side of the stacked body 14, and the arrow A1 of the stacked body 14 is stacked. The second end power generation unit 22 and the third dummy cell 24 are stacked on the side.

このように、積層体１４の矢印Ａ１側、換言すると、酸化剤ガスの入口側に対して、積層体１４の矢印Ａ２側、換言すると、酸化剤ガスの出口側よりも多数のダミーセルを配設することで、発電セル１２に結露水が進入することをより効果的に抑制することを可能とした。しかしながら、燃料電池スタック１０は、積層体１４の積層方向の少なくとも一端側にダミーセルを備えていればよく、該ダミーセルの個数も特に限定されるものではない。   In this way, a larger number of dummy cells are arranged on the arrow A1 side of the laminate 14, in other words, on the arrow A2 side of the laminate 14, in other words, on the oxidant gas outlet side. By doing so, it was possible to more effectively suppress the entry of condensed water into the power generation cell 12. However, the fuel cell stack 10 only needs to include a dummy cell on at least one end side in the stacking direction of the stacked body 14, and the number of the dummy cells is not particularly limited.

また、発電セル１２と第１ダミーセル１８又は第３ダミーセル２４との間に第１端部発電ユニット１６又は第２端部発電ユニット２２を介在させることで、積層体１４の積層方向の両端部で発電を行う第１端部発電ユニット１６及び第２端部発電ユニット２２内の電解質膜・電極構造体８０を、他の電解質膜・電極構造体８０と同様の条件で冷却することを可能とした。その結果、積層体１４全体における発熱と冷却のバランスを同等とすることができるため、発電性能及び発電安定性のさらなる向上を図ることができる。   Further, by interposing the first end power generation unit 16 or the second end power generation unit 22 between the power generation cell 12 and the first dummy cell 18 or the third dummy cell 24, at both ends of the stacked body 14 in the stacking direction. The electrolyte membrane / electrode structure 80 in the first end power generation unit 16 and the second end power generation unit 22 that generate power can be cooled under the same conditions as other electrolyte membrane / electrode structures 80. . As a result, since the balance between heat generation and cooling in the entire laminated body 14 can be made equal, further improvement in power generation performance and power generation stability can be achieved.

しかしながら、第１端部発電ユニット１６及び第２端部発電ユニット２２は必須の構成要素ではなく、燃料電池スタック１０は、第１端部発電ユニット１６及び第２端部発電ユニット２２の何れか一方のみを備えてもよいし、何れも備えていなくてもよい。   However, the first end power generation unit 16 and the second end power generation unit 22 are not indispensable components, and the fuel cell stack 10 includes either the first end power generation unit 16 or the second end power generation unit 22. May be provided, or none may be provided.

１０…燃料電池スタック １２…発電セル
１４…積層体 １８…第１ダミーセル
２０…第２ダミーセル ２４…第３ダミーセル
１０６…樹脂枠付きダミー構造体 １１０…ダミー構造体
１１１…ダミー樹脂枠部材 １１２…第１導電性多孔質体
１１４…第２導電性多孔質体 １１６…第３導電性多孔質体
１２０…第２接合部 １２０ａ…角接合部
１２０ｂ…近接接合部 １２０ｃ…長辺接合部
１２０ｄ…短辺接合部 １２０ｅ…樹脂突起部 DESCRIPTION OF SYMBOLS 10 ... Fuel cell stack 12 ... Power generation cell 14 ... Laminated body 18 ... 1st dummy cell 20 ... 2nd dummy cell 24 ... 3rd dummy cell 106 ... Dummy structure with a resin frame 110 ... Dummy structure 111 ... Dummy resin frame member 112 ... 1st DESCRIPTION OF SYMBOLS 1 Conductive porous body 114 ... 2nd conductive porous body 116 ... 3rd conductive porous body 120 ... 2nd junction part 120a ... Corner junction part 120b ... Proximity junction part 120c ... Long side junction part 120d ... Short side Joint 120e ... Resin protrusion

Claims (19)

電解質膜の両側に導電性多孔質体からなるガス拡散層を有する電極がそれぞれ配設された電解質膜・電極構造体と、前記電解質膜・電極構造体の外周を周回する樹脂枠部材と、前記電解質膜・電極構造体を挟むセパレータとを有する発電セルを複数積層した積層体、及び前記積層体の積層方向の少なくとも一方の端部に配設されるダミーセルを備える燃料電池スタックであって、
前記ダミーセルは、前記電解質膜・電極構造体に対応し且つ矩形状の平面寸法がそれぞれ異なる３枚の導電性多孔質体を積層して形成されるダミー構造体と、前記ダミー構造体の外周を周回するダミー樹脂枠部材と、前記ダミー構造体を挟むダミーセパレータと、を備え、
前記ダミー樹脂枠部材と少なくとも１枚の前記導電性多孔質体とは、該導電性多孔質体に接着樹脂を含浸させた含浸接合部が、前記導電性多孔質体の外周の周方向に断続的に設けられることで接合され、
前記含浸接合部は、前記導電性多孔質体の角部に設けられる角接合部と、前記導電性多孔質体の長辺の前記角接合部に近接する位置に設けられる近接接合部と、を有することを特徴とする燃料電池スタック。 An electrolyte membrane / electrode structure in which electrodes each having a gas diffusion layer made of a conductive porous body are disposed on both sides of the electrolyte membrane; a resin frame member that circulates around an outer periphery of the electrolyte membrane / electrode structure; A fuel cell stack comprising a laminate in which a plurality of power generation cells having a separator sandwiching an electrolyte membrane / electrode structure is laminated, and a dummy cell disposed at at least one end in the lamination direction of the laminate,
The dummy cell includes a dummy structure formed by stacking three conductive porous bodies corresponding to the electrolyte membrane / electrode structure and having different rectangular planar dimensions, and an outer periphery of the dummy structure. A dummy resin frame member that circulates, and a dummy separator that sandwiches the dummy structure,
The dummy resin frame member and at least one of the conductive porous bodies are formed by intermittently connecting an impregnated joint obtained by impregnating the conductive porous body with an adhesive resin in the circumferential direction of the outer periphery of the conductive porous body. Joined by being provided,
The impregnated joint includes: a corner joint provided at a corner of the conductive porous body; and a proximity joint provided at a position close to the corner joint on the long side of the conductive porous body. A fuel cell stack comprising: 請求項１記載の燃料電池スタックにおいて、
前記含浸接合部は、前記導電性多孔質体の長辺の前記角接合部同士の間を複数の長辺区間に分割する位置に設けられる長辺接合部と、前記導電性多孔質体の短辺の前記角接合部同士の間を複数の短辺区間に分割する位置に設けられる短辺接合部と、をさらに有し、
前記長辺区間のそれぞれの長さは、前記短辺区間のそれぞれの長さよりも大きいことを特徴とする燃料電池スタック。 The fuel cell stack according to claim 1, wherein
The impregnated joint includes a long side joint provided at a position where the corner joints of the long sides of the conductive porous body are divided into a plurality of long side sections, and a short side of the conductive porous body. A short side joint provided at a position that divides the corner joints of the sides into a plurality of short side sections, and
Each of the long side sections has a length greater than each of the short side sections. 請求項２記載の燃料電池スタックにおいて、
前記長辺区間の長さは互いに等しく、
前記短辺区間の長さは互いに等しく、
前記角接合部と該角接合部に隣接する前記近接接合部との間隔をＬａとし、前記長辺区間の長さをＬｂとし、前記短辺区間の長さをＬｃとするとき、Ｌａ＜Ｌｃ＜Ｌｂの関係が成り立つことを特徴とする燃料電池スタック。 The fuel cell stack according to claim 2, wherein
The long side sections have the same length,
The lengths of the short side sections are equal to each other,
When the interval between the corner joint and the adjacent joint adjacent to the corner joint is La, the length of the long side section is Lb, and the length of the short side section is Lc, La <Lc <A fuel cell stack characterized by the relationship of Lb. 請求項１〜３の何れか１項に記載の燃料電池スタックにおいて、
前記接着樹脂は、溶融させた前記ダミー樹脂枠部材の一部であることを特徴とする燃料電池スタック。 The fuel cell stack according to any one of claims 1 to 3,
The fuel cell stack, wherein the adhesive resin is a part of the molten dummy resin frame member. 請求項４記載の燃料電池スタックにおいて、
前記ダミー樹脂枠部材の前記一部は、前記ダミー樹脂枠部材の厚さ方向に突出するように設けられた樹脂突起部であることを特徴とする燃料電池スタック。 The fuel cell stack according to claim 4, wherein
The fuel cell stack, wherein the part of the dummy resin frame member is a resin protrusion provided so as to protrude in a thickness direction of the dummy resin frame member. 請求項１〜５の何れか１項に記載の燃料電池スタックにおいて、
前記３枚の導電性多孔質体は、第１導電性多孔質体と、前記第１導電性多孔質体よりも平面寸法が大きい第２導電性多孔質体と、前記第２導電性多孔質体よりも平面寸法が大きい第３導電性多孔質体とからなり、
前記ダミー樹脂枠部材は、外周縁部と、前記外周縁部の内周端から第１段差面を介して全周に亘って内方に突出した棚部と、前記棚部の内周端から第２段差面を介して全周に亘って内方に突出した薄肉部とを有し、
前記第３導電性多孔質体の外周縁部は、前記ダミー樹脂枠部材の前記棚部に重なり、
前記第２導電性多孔質体の外周縁部は、前記ダミー樹脂枠部材の前記薄肉部に臨み、
前記第１導電性多孔質体の外周端面は、前記ダミー樹脂枠部材の内周端面に対向することを特徴とする燃料電池スタック。 In the fuel cell stack according to any one of claims 1 to 5,
The three conductive porous bodies include a first conductive porous body, a second conductive porous body having a planar dimension larger than that of the first conductive porous body, and the second conductive porous body. A third conductive porous body having a larger planar dimension than the body,
The dummy resin frame member includes an outer peripheral edge, a shelf protruding inward from the inner peripheral end of the outer peripheral edge through the first step surface, and an inner peripheral end of the shelf. A thin portion protruding inward over the entire circumference through the second step surface,
The outer peripheral edge of the third conductive porous body overlaps the shelf of the dummy resin frame member,
The outer peripheral edge of the second conductive porous body faces the thin portion of the dummy resin frame member,
The fuel cell stack, wherein an outer peripheral end face of the first conductive porous body is opposed to an inner peripheral end face of the dummy resin frame member. 請求項６記載の燃料電池スタックにおいて、
前記ダミー樹脂枠部材の前記棚部と、前記第３導電性多孔質体の外周縁部とが前記含浸接合部により接合されることを特徴とする燃料電池スタック。 The fuel cell stack according to claim 6, wherein
The fuel cell stack, wherein the shelf portion of the dummy resin frame member and the outer peripheral edge portion of the third conductive porous body are joined by the impregnation joining portion. 請求項６又は７記載の燃料電池スタックにおいて、
前記第２導電性多孔質体の厚みは、前記第２段差面の高さよりも大きいことを特徴とする燃料電池スタック。 The fuel cell stack according to claim 6 or 7,
The fuel cell stack, wherein the thickness of the second conductive porous body is greater than the height of the second step surface. 請求項６〜８の何れか１項に記載の燃料電池スタックにおいて、
前記ダミー樹脂枠部材の前記薄肉部と、前記第３導電性多孔質体との間には、空間が形成されることを特徴とする燃料電池スタック。 The fuel cell stack according to any one of claims 6 to 8,
A fuel cell stack, wherein a space is formed between the thin portion of the dummy resin frame member and the third conductive porous body. 電解質膜の両側に導電性多孔質体からなるガス拡散層を有する電極がそれぞれ配設された電解質膜・電極構造体と、前記電解質膜・電極構造体の外周を周回する樹脂枠部材と、前記電解質膜・電極構造体を挟むセパレータとを有する発電セルを複数積層した積層体を備える燃料電池スタックの前記積層体の積層方向の少なくとも一方の端部に配設されるダミーセルの製造方法であって、
矩形状の平面寸法がそれぞれ異なる３枚の導電性多孔質体を積層して、前記電解質膜・電極構造体に対応するダミー構造体を形成する第１積層工程と、
前記ダミー構造体の外周を周回するようにダミー樹脂枠部材を配置した状態で、少なくとも１枚の前記導電性多孔質体の外周縁部の周方向に断続的に接着樹脂を含浸させて含浸接合部を形成することにより、前記ダミー構造体と前記ダミー樹脂枠部材とを接合する接合工程と、
前記ダミー樹脂枠部材と接合された前記ダミー構造体をダミーセパレータで挟む第２積層工程と、
を有することを特徴とするダミーセルの製造方法。 An electrolyte membrane / electrode structure in which electrodes each having a gas diffusion layer made of a conductive porous body are disposed on both sides of the electrolyte membrane; a resin frame member that circulates around an outer periphery of the electrolyte membrane / electrode structure; A method of manufacturing a dummy cell disposed at at least one end in a stacking direction of a stack of a fuel cell stack including a stack of a plurality of power generation cells each having a separator sandwiching an electrolyte membrane / electrode structure. ,
A first laminating step of laminating three conductive porous bodies each having a different rectangular planar dimension to form a dummy structure corresponding to the electrolyte membrane / electrode structure;
With the dummy resin frame member arranged around the outer periphery of the dummy structure body, the adhesive resin is intermittently impregnated in the circumferential direction of the outer peripheral edge of at least one of the conductive porous bodies, and impregnated and joined. A bonding step of bonding the dummy structure and the dummy resin frame member by forming a portion;
A second stacking step of sandwiching the dummy structure joined to the dummy resin frame member with a dummy separator;
A method for manufacturing a dummy cell, comprising: 請求項１０記載のダミーセルの製造方法において、
前記接合工程では、前記含浸接合部として、前記導電性多孔質体の角部に角接合部を形成し、前記導電性多孔質体の長辺の前記角接合部に近接する位置に近接接合部を形成することを特徴とするダミーセルの製造方法。 In the manufacturing method of the dummy cell of Claim 10,
In the joining step, as the impregnated joining portion, a corner joining portion is formed at a corner portion of the conductive porous body, and a proximity joining portion is located at a position close to the corner joining portion on the long side of the conductive porous body. Forming a dummy cell. 請求項１１記載のダミーセルの製造方法において、
前記接合工程では、前記含浸接合部として、前記導電性多孔質体の長辺の前記角接合部同士の間を複数の長辺区間に分割するように配置される長辺接合部と、前記導電性多孔質体の短辺の前記角接合部同士の間を複数の短辺区間に分割するように配置される短辺接合部とを、前記長辺区間のそれぞれの長さが、前記短辺区間のそれぞれの長さより大きくなるように設けることを特徴とするダミーセルの製造方法。 In the manufacturing method of the dummy cell of Claim 11,
In the joining step, as the impregnated joined part, a long side joined part arranged so as to divide the long sides of the conductive porous body into a plurality of long side sections, and the conductive Short side joints arranged so as to divide between the short side corners of the porous porous body into a plurality of short side sections, the length of each of the long side sections is the short side A method for manufacturing a dummy cell, wherein the dummy cell is provided so as to be larger than each length of the section. 請求項１２記載のダミーセルの製造方法において、
前記接合工程では、前記長辺区間の長さを互いに等しくし、前記短辺区間の長さを互いに等しくし、前記角接合部と該角接合部に隣接する前記近接接合部との間隔をＬａとし、前記長辺区間の長さをＬｂとし、前記短辺区間の長さをＬｃとするとき、Ｌａ＜Ｌｃ＜Ｌｂの関係が成り立つように前記導電性多孔質体に前記含浸接合部を設けることを特徴とするダミーセルの製造方法。 In the manufacturing method of the dummy cell of Claim 12,
In the joining step, the lengths of the long side sections are made equal to each other, the lengths of the short side sections are made equal to each other, and an interval between the corner joint portion and the adjacent joint portion adjacent to the corner joint portion is La. When the length of the long side section is Lb and the length of the short side section is Lc, the impregnated joint is provided in the conductive porous body so that the relationship La <Lc <Lb is established. A method for manufacturing a dummy cell. 請求項１０〜１３の何れか１項に記載のダミーセルの製造方法において、
前記接合工程では、前記接着樹脂として、溶融した前記ダミー樹脂枠部材の一部を前記導電性多孔質体に含浸させて前記含浸接合部を形成することを特徴とするダミーセルの製造方法。 In the manufacturing method of the dummy cell of any one of Claims 10-13,
In the joining step, a dummy cell manufacturing method is characterized in that the conductive porous body is impregnated with a part of the molten dummy resin frame member as the adhesive resin to form the impregnated joint. 請求項１４記載のダミーセルの製造方法において、
前記接合工程では、前記ダミー樹脂枠部材の厚さ方向に突出するように設けた樹脂突起部を前記ダミー樹脂枠部材の前記一部とすることを特徴とするダミーセルの製造方法。 The method of manufacturing a dummy cell according to claim 14,
In the bonding step, the dummy cell manufacturing method is characterized in that a resin protrusion provided so as to protrude in the thickness direction of the dummy resin frame member is used as the part of the dummy resin frame member. 請求項１０〜１５の何れか１項に記載のダミーセルの製造方法において、
前記第１積層工程では、前記３枚の導電性多孔質体として、第１導電性多孔質体と、前記第１導電性多孔質体よりも平面寸法が大きい第２導電性多孔質体と、前記第２導電性多孔質体よりも平面寸法が大きい第３導電性多孔質体とを積層して前記ダミー構造体を形成し、
前記ダミー樹脂枠部材は、外周縁部と、前記外周縁部の内周端から第１段差面を介して全周に亘って内方に突出した棚部と、前記棚部の内周端から第２段差面を介して全周に亘って内方に突出した薄肉部とを有し、
前記接合工程では、前記第３導電性多孔質体の外周縁部を、前記ダミー樹脂枠部材の前記棚部に重ね、前記第２導電性多孔質体の外周縁部を、前記ダミー樹脂枠部材の前記薄肉部に臨ませ、前記第１導電性多孔質体の外周端面を、前記ダミー樹脂枠部材の内周端面に対向させた状態で、前記含浸接合部を形成することを特徴とするダミーセルの製造方法。 In the manufacturing method of the dummy cell of any one of Claims 10-15,
In the first lamination step, as the three conductive porous bodies, a first conductive porous body, a second conductive porous body having a larger planar dimension than the first conductive porous body, The dummy structure is formed by laminating a third conductive porous body having a larger planar dimension than the second conductive porous body,
The dummy resin frame member includes an outer peripheral edge, a shelf protruding inward from the inner peripheral end of the outer peripheral edge through the first step surface, and an inner peripheral end of the shelf. A thin portion protruding inward over the entire circumference through the second step surface,
In the joining step, the outer peripheral edge of the third conductive porous body is overlaid on the shelf of the dummy resin frame member, and the outer peripheral edge of the second conductive porous body is overlapped with the dummy resin frame member. The impregnated joint is formed with the outer peripheral end face of the first conductive porous body facing the inner peripheral end face of the dummy resin frame member facing the thin wall portion of the dummy cell. Manufacturing method. 請求項１６記載のダミーセルの製造方法において、
前記接合工程では、前記ダミー樹脂枠部材の前記棚部と、前記第３導電性多孔質体の外周縁部とを前記含浸接合部により接合することを特徴とするダミーセルの製造方法。 The method of manufacturing a dummy cell according to claim 16,
In the joining step, the shelf portion of the dummy resin frame member and the outer peripheral edge portion of the third conductive porous body are joined by the impregnation joining portion. 請求項１６又は１７記載のダミーセルの製造方法において、
前記第２導電性多孔質体の厚みは、前記第２段差面の高さよりも大きいことを特徴とするダミーセルの製造方法。 In the manufacturing method of the dummy cell of Claim 16 or 17,
The method of manufacturing a dummy cell, wherein the thickness of the second conductive porous body is larger than the height of the second step surface. 請求項１６〜１８の何れか１項に記載のダミーセルの製造方法において、
前記第１積層工程では、前記ダミー樹脂枠部材の前記薄肉部と、前記第３導電性多孔質体との間に、空間を形成することを特徴とするダミーセルの製造方法。 In the manufacturing method of the dummy cell of any one of Claims 16-18,
In the first stacking step, a space is formed between the thin portion of the dummy resin frame member and the third conductive porous body.
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