JP2013157093A - Fuel cell - Google Patents

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JP2013157093A
JP2013157093A JP2012014699A JP2012014699A JP2013157093A JP 2013157093 A JP2013157093 A JP 2013157093A JP 2012014699 A JP2012014699 A JP 2012014699A JP 2012014699 A JP2012014699 A JP 2012014699A JP 2013157093 A JP2013157093 A JP 2013157093A
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electrolyte membrane
resin member
electrode
fuel cell
separator
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Naoki Mitsuda
直樹 満田
Natsuki Anzai
夏樹 安齊
Hiroshi Soma
浩 相馬
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Honda Motor Co Ltd
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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

Abstract

PROBLEM TO BE SOLVED: To provide a fuel cell that prevents stress on a membrane electrode assembly with a resin member provided therein and that favorably suppresses warpage or detachment of the membrane electrode assembly with a simple and economical configuration.SOLUTION: A fuel cell 10 includes a membrane electrode assembly 12 that has a resin body 24 integrated into first two ends thereof. The resin body 24 is made up of only a first resin member 24a and a second resin member 24b. The first resin member 24a is provided with an inlet buffer section 26a that is positioned between an inlet side of an oxidant gas passage 42 and an oxidant gas inlet communication hole 30a and that is laminated on a second separator 16. The second resin member 24b is provided with an outlet buffer section 26b that is positioned between an outlet side of the oxidant gas passage 42 and an oxidant gas outlet communication hole 30b and that is laminated on the second separator 16.

Description

本発明は、固体高分子電解質膜の一方面に第１電極が、他方の面に第２電極が、それぞれ設けられる電解質膜・電極構造体と、セパレータとを備える燃料電池に関する。   The present invention relates to a fuel cell comprising an electrolyte membrane / electrode structure provided with a first electrode on one surface of a solid polymer electrolyte membrane and a second electrode on the other surface, and a separator.

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を採用している。この燃料電池は、固体高分子電解質膜の両側に、それぞれ触媒層（電極触媒層）及びガス拡散層（多孔質カーボン）を有するアノード電極とカソード電極とを配設した電解質膜・電極構造体（ＭＥＡ）を、セパレータ（バイポーラ板）によって挟持している。この燃料電池は、所定の数だけ積層して燃料電池スタックを構成するとともに、例えば、車載用燃料電池スタックとして使用されている。   In general, a polymer electrolyte fuel cell employs a polymer electrolyte membrane made of a polymer ion exchange membrane. This fuel cell has an electrolyte membrane / electrode structure in which an anode electrode and a cathode electrode each having a catalyst layer (electrode catalyst layer) and a gas diffusion layer (porous carbon) are disposed on both sides of a solid polymer electrolyte membrane ( MEA) is sandwiched between separators (bipolar plates). A predetermined number of fuel cells are stacked to form a fuel cell stack, and the fuel cell is used as, for example, an in-vehicle fuel cell stack.

この種の電解質膜・電極構造体では、比較的高価な固体高分子電解質膜の使用量を削減させるとともに、薄膜状で強度が低い前記固体高分子電解質膜を保護するために、樹脂製枠部材を組み込んだ枠付きＭＥＡが採用されている。   In this type of electrolyte membrane / electrode structure, a resin frame member is used to reduce the amount of the relatively expensive solid polymer electrolyte membrane used and to protect the thin polymer electrolyte membrane having a low strength. A MEA with a frame that incorporates is adopted.

例えば、特許文献１に開示されている膜電極組立体では、図７に示すように、高分子電解質膜１を備え、前記電解質膜１の一方の面側には、第１の電極層２が設けられるとともに、前記第１の電極層２の該電解質膜１とは反対側には、第１のガス拡散層３が設けられている。   For example, the membrane electrode assembly disclosed in Patent Document 1 includes a polymer electrolyte membrane 1 as shown in FIG. 7, and the first electrode layer 2 is formed on one surface side of the electrolyte membrane 1. A first gas diffusion layer 3 is provided on the opposite side of the first electrode layer 2 from the electrolyte membrane 1.

電解質膜１の他方の面側には、第２の電極層４が設けられ、前記第２の電極層４の前記電解質膜１とは反対側には、第２のガス拡散層５が設けられることにより、膜電極接合体（ＭＥＡ）６が構成されている。   A second electrode layer 4 is provided on the other surface side of the electrolyte membrane 1, and a second gas diffusion layer 5 is provided on the opposite side of the second electrode layer 4 from the electrolyte membrane 1. Thus, a membrane electrode assembly (MEA) 6 is configured.

膜電極接合体６には、電解質膜１の外周縁の全部並びに第１のガス拡散層３及び第２のガス拡散層５の外周縁の少なくとも一部であって前記電解質膜１の側を包囲するように、樹脂枠７が設けられている。   The membrane electrode assembly 6 surrounds the entire electrolyte membrane 1 and at least a part of the outer circumference of the first gas diffusion layer 3 and the second gas diffusion layer 5 and surrounds the electrolyte membrane 1 side. As shown, a resin frame 7 is provided.

第１のガス拡散層３及び第１の電極層２は、前記第１のガス拡散層３の外周縁全体が電解質膜１の外周縁の範囲内に収まるとともに、前記第１の電極層２の外周縁全周に亘って該第１の電極層２の外周縁と該電解質膜１の外周縁との間に該電解質膜１の表面領域が残るように、該電解質膜１の表面上に配置されている。第２のガス拡散層５は、電解質膜１の外周縁全周に亘って該表面領域とは反対側の少なくとも一部にまで延在しており、さらに樹脂枠７は、該表面領域の少なくとも一部に固着されている。   The first gas diffusion layer 3 and the first electrode layer 2 are configured such that the entire outer peripheral edge of the first gas diffusion layer 3 is within the range of the outer peripheral edge of the electrolyte membrane 1 and the first electrode layer 2 Arranged on the surface of the electrolyte membrane 1 so that the surface region of the electrolyte membrane 1 remains between the outer periphery of the first electrode layer 2 and the outer periphery of the electrolyte membrane 1 over the entire outer periphery. Has been. The second gas diffusion layer 5 extends to the at least part of the opposite side of the surface region over the entire outer periphery of the electrolyte membrane 1, and the resin frame 7 further includes at least the surface region. It is fixed to a part.

特開２００８−４１３３７号公報JP 2008-41337 A

上記の特許文献１では、膜電極接合体６には、電解質膜１の外周縁の全周並びに第１のガス拡散層３及び第２のガス拡散層５の外周縁を囲繞して樹脂枠７が固着されている。   In the above-mentioned Patent Document 1, the membrane electrode assembly 6 includes a resin frame 7 surrounding the entire outer periphery of the electrolyte membrane 1 and the outer periphery of the first gas diffusion layer 3 and the second gas diffusion layer 5. Is fixed.

このため、膜電極接合体６の製作時や燃料電池の運転時に、温度変化が惹起されると、樹脂枠７と第１のガス拡散層３及び第２のガス拡散層５とで、それぞれの伸縮寸法が異なって応力が発生し易い。従って、膜電極接合体６に反りが生じたり、樹脂枠７の剥離がするという問題がある。   For this reason, when a change in temperature is induced during manufacture of the membrane electrode assembly 6 or during operation of the fuel cell, the resin frame 7, the first gas diffusion layer 3, and the second gas diffusion layer 5 The expansion and contraction dimensions are different and stress is likely to occur. Accordingly, there is a problem that the membrane electrode assembly 6 is warped or the resin frame 7 is peeled off.

本発明は、この種の問題を解決するものであり、樹脂部材が設けられる電解質膜・電極構造体に応力が発生することがなく、簡単且つ経済的な構成で、前記電解質膜・電極構造体の反りや剥離を良好に抑制することが可能な燃料電池を提供することを目的とする。   The present invention solves this type of problem, and does not generate stress in the electrolyte membrane / electrode structure on which the resin member is provided, and the electrolyte membrane / electrode structure has a simple and economical configuration. An object of the present invention is to provide a fuel cell capable of satisfactorily suppressing warpage and peeling.

本発明は、固体高分子電解質膜の一方の面に、第１触媒層及び第１ガス拡散層を有する第１電極が配設され、且つ前記固体高分子電解質膜の他方の面に、第２触媒層及び第２ガス拡散層を有する第２電極が配設される電解質膜・電極構造体と、電極面に沿って反応ガスを供給する反応ガス流路がセパレータ面内に形成されるとともに、前記反応ガス流路の入口側に連通して前記セパレータ面を貫通する反応ガス入口連通孔、及び前記反応ガスの出口側に連通して前記セパレータ面を貫通する反応ガス出口連通孔が形成されるセパレータとを備える燃料電池に関するものである。   In the present invention, a first electrode having a first catalyst layer and a first gas diffusion layer is disposed on one surface of a solid polymer electrolyte membrane, and a second electrode is disposed on the other surface of the solid polymer electrolyte membrane. An electrolyte membrane / electrode structure in which a second electrode having a catalyst layer and a second gas diffusion layer is disposed, and a reaction gas flow path for supplying a reaction gas along the electrode surface are formed in the separator surface, A reaction gas inlet communication hole that communicates with the inlet side of the reaction gas channel and penetrates the separator surface, and a reaction gas outlet communication hole that communicates with the outlet side of the reaction gas and penetrates the separator surface are formed. The present invention relates to a fuel cell including a separator.

この燃料電池では、電解質膜・電極構造体は、矩形状を有するとともに、一方の両端部を構成する第１辺に一体化される第１樹脂部材と、前記一方の両端部を構成する第２辺に一体化される第２樹脂部材とのみからなる樹脂体を備えている。   In this fuel cell, the electrolyte membrane / electrode structure has a rectangular shape, a first resin member integrated with a first side constituting one end portion, and a second resin constituting the one end portion. A resin body including only the second resin member integrated with the side is provided.

そして、第１樹脂部材は、反応ガス流路の入口側と反応ガス入口連通孔との間に位置してセパレータに積層される入口バッファ部を設け、第２樹脂部材は、前記反応ガス流路の出口側と反応ガス出口連通孔との間に位置して前記セパレータに積層される出口バッファ部を設けている。   The first resin member is provided with an inlet buffer portion that is positioned between the inlet side of the reactive gas flow path and the reactive gas inlet communication hole and is stacked on the separator, and the second resin member is provided with the reactive gas flow path. An outlet buffer portion is provided between the outlet side and the reaction gas outlet communication hole and is stacked on the separator.

また、この燃料電池では、第１樹脂部材及び第２樹脂部材には、複数の突起部又はガイド流路溝が一体に設けられることが好ましい。   Moreover, in this fuel cell, it is preferable that the first resin member and the second resin member are integrally provided with a plurality of protrusions or guide channel grooves.

さらに、この燃料電池では、電解質膜・電極構造体は、長方形状を有し、短辺側の２辺に第１樹脂部材及び第２樹脂部材が含浸又は接着により一体化されることが好ましい。   Furthermore, in this fuel cell, it is preferable that the electrolyte membrane / electrode structure has a rectangular shape, and the first resin member and the second resin member are integrated by impregnation or adhesion on two sides on the short side.

さらにまた、この燃料電池では、電解質膜・電極構造体の長辺側の２辺で、第１ガス拡散層の平面寸法は、第２ガス拡散層の平面寸法よりも大きな寸法に設定されることが好ましい。   Furthermore, in this fuel cell, the planar dimension of the first gas diffusion layer is set to be larger than the planar dimension of the second gas diffusion layer on the two long sides of the electrolyte membrane / electrode structure. Is preferred.

本発明によれば、電解質膜・電極構造体に一体化される樹脂体は、入口バッファ部を設ける第１樹脂部材と、出口バッファ部を設ける第２樹脂部材とからのみで構成されている。このため、電解質膜・電極構造体の全周が樹脂体で覆われることがなく、前記樹脂体と第１ガス拡散層及び第２ガス拡散層との伸縮率の相違により発生する応力が良好に低減される。ここで、入口バッファ部及び出口バッファ部は、反応ガスを反応ガス流路に均一に分配して流通させる機能を有する。   According to the present invention, the resin body integrated with the electrolyte membrane / electrode structure is composed of only the first resin member provided with the inlet buffer portion and the second resin member provided with the outlet buffer portion. Therefore, the entire circumference of the electrolyte membrane / electrode structure is not covered with the resin body, and the stress generated by the difference in expansion / contraction ratio between the resin body and the first gas diffusion layer and the second gas diffusion layer is good. Reduced. Here, the inlet buffer unit and the outlet buffer unit have a function of uniformly distributing and flowing the reaction gas to the reaction gas channel.

これにより、樹脂体が設けられる電解質膜・電極構造体に応力が発生することがなく、簡単且つ経済的な構成で、前記電解質膜・電極構造体の反りや剥離を良好に抑制することが可能になる。   As a result, no stress is generated in the electrolyte membrane / electrode structure on which the resin body is provided, and it is possible to satisfactorily suppress warping and peeling of the electrolyte membrane / electrode structure with a simple and economical configuration. become.

本発明の第１の実施形態に係る燃料電池の要部分解斜視説明図である。It is a principal part disassembled perspective explanatory drawing of the fuel cell which concerns on the 1st Embodiment of this invention. 前記燃料電池の、図１中、ＩＩ−ＩＩ線断面説明図である。FIG. 2 is a sectional view of the fuel cell taken along line II-II in FIG. 1. 前記燃料電池の、図１中、ＩＩＩ−ＩＩＩ線断面説明図である。FIG. 3 is a cross-sectional explanatory view of the fuel cell taken along line III-III in FIG. 1. 前記燃料電池を構成する電解質膜・電極構造体の一方の面の説明図である。It is explanatory drawing of one surface of the electrolyte membrane and electrode structure which comprises the said fuel cell. 本発明の第２の実施形態に係る燃料電池を構成する電解質膜・電極構造体の正面説明図である。It is front explanatory drawing of the electrolyte membrane and electrode structure which comprises the fuel cell which concerns on the 2nd Embodiment of this invention. 本発明の第３の実施形態に係る燃料電池の要部断面説明図である。It is principal part cross-sectional explanatory drawing of the fuel cell which concerns on the 3rd Embodiment of this invention. 特許文献１に開示されている膜電極組立体の説明図である。It is explanatory drawing of the membrane electrode assembly currently disclosed by patent document 1. FIG.

図１に示すように、本発明の第１の実施形態に係る燃料電池１０は、電解質膜・電極構造体１２を第１セパレータ１４及び第２セパレータ１６で挟持する。第１セパレータ１４及び第２セパレータ１６は、縦長（又は横長）の長方形状を有し、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、あるいはその金属表面に防食用の表面処理を施した金属板を波板状にプレス成形して構成され、又は、カーボン部材等で構成されている。   As shown in FIG. 1, the fuel cell 10 according to the first embodiment of the present invention sandwiches an electrolyte membrane / electrode structure 12 between a first separator 14 and a second separator 16. The first separator 14 and the second separator 16 have a vertically long (or horizontally long) rectangular shape. For example, a steel plate, a stainless steel plate, an aluminum plate, a plated steel plate, or a metal surface thereof is subjected to a surface treatment for anticorrosion. It is configured by pressing a metal plate into a corrugated shape, or is configured by a carbon member or the like.

複数の燃料電池１０は、例えば、水平方向（矢印Ａ方向）に沿って互いに積層されてスタック（例えば、車載用燃料電池スタック）を構成する。なお、燃料電池１０は、重力方向（鉛直方向）に積層されてもよい。   The plurality of fuel cells 10 are stacked together in the horizontal direction (arrow A direction), for example, to form a stack (for example, an in-vehicle fuel cell stack). The fuel cell 10 may be stacked in the direction of gravity (vertical direction).

図２及び図３に示すように、長方形状（又は正方形状）の電解質膜・電極構造体１２は、例えば、パーフルオロスルホン酸の薄膜に水が含浸された固体高分子電解質膜１８と、前記固体高分子電解質膜１８を挟持するカソード電極（第１電極）２０及びアノード電極（第２電極）２２とを有する。固体高分子電解質膜１８は、フッ素系電解質の他、ＨＣ（炭化水素）系電解質が使用される。   As shown in FIGS. 2 and 3, the rectangular (or square) electrolyte membrane / electrode structure 12 includes, for example, a solid polymer electrolyte membrane 18 in which a perfluorosulfonic acid thin film is impregnated with water, A cathode electrode (first electrode) 20 and an anode electrode (second electrode) 22 sandwiching the solid polymer electrolyte membrane 18 are included. The solid polymer electrolyte membrane 18 uses an HC (hydrocarbon) electrolyte in addition to a fluorine electrolyte.

カソード電極２０は、固体高分子電解質膜１８の一方の面１８ａに接合される第１電極触媒層（第１触媒層）２０ａと、前記第１電極触媒層２０ａに積層される第１ガス拡散層２０ｂとを設ける。アノード電極２２は、固体高分子電解質膜１８の面１８ｂに接合される第２電極触媒層（第２触媒層）２２ａと、前記第２電極触媒層２２ａに積層される第２ガス拡散層２２ｂとを設ける。   The cathode electrode 20 includes a first electrode catalyst layer (first catalyst layer) 20a joined to one surface 18a of the solid polymer electrolyte membrane 18, and a first gas diffusion layer laminated on the first electrode catalyst layer 20a. 20b. The anode electrode 22 includes a second electrode catalyst layer (second catalyst layer) 22a joined to the surface 18b of the solid polymer electrolyte membrane 18, and a second gas diffusion layer 22b laminated on the second electrode catalyst layer 22a. Is provided.

第１電極触媒層２０ａ及び第２電極触媒層２２ａは、同一の外形寸法を有するとともに、長辺方向の両端部では、固体高分子電解質膜１８と同一の外形寸法に設定される（図２参照）。第１電極触媒層２０ａ及び第２電極触媒層２２ａは、短辺方向の両端部では、固体高分子電解質膜１８よりも小さな外形寸法に設定される（図３参照）。   The first electrode catalyst layer 20a and the second electrode catalyst layer 22a have the same outer dimensions, and are set to the same outer dimensions as the solid polymer electrolyte membrane 18 at both ends in the long side direction (see FIG. 2). ). The first electrode catalyst layer 20a and the second electrode catalyst layer 22a have outer dimensions smaller than that of the solid polymer electrolyte membrane 18 at both ends in the short side direction (see FIG. 3).

第１ガス拡散層２０ｂは、固体高分子電解質膜１８と同一の外形寸法に設定される（図２及び図３参照）。第２ガス拡散層２２ｂは、長辺方向の両端部で固体高分子電解質膜１８と同一の外形寸法に設定され（図２参照）、且つ、短辺方向の両端部で、前記固体高分子電解質膜１８よりも小さな外形寸法に設定される（図３参照）。   The first gas diffusion layer 20b is set to the same outer dimensions as the solid polymer electrolyte membrane 18 (see FIGS. 2 and 3). The second gas diffusion layer 22b is set to have the same outer dimensions as the solid polymer electrolyte membrane 18 at both ends in the long side direction (see FIG. 2), and the solid polymer electrolyte at both ends in the short side direction. The outer dimension is set smaller than that of the film 18 (see FIG. 3).

第１電極触媒層２０ａ及び第２電極触媒層２２ａは、カーボンブラックに白金粒子を担持した触媒粒子を形成し、イオン導伝性バインダーとして高分子電解質を使用し、この高分子電解質の溶液中に前記触媒粒子を均一に混合して作製された触媒ペーストを、固体高分子電解質膜１８の両方の面１８ａ、１８ｂに印刷、塗布又は転写することによって構成される。   The first electrode catalyst layer 20a and the second electrode catalyst layer 22a are formed by forming catalyst particles in which platinum particles are supported on carbon black, using a polymer electrolyte as an ion conductive binder, and in the solution of the polymer electrolyte. The catalyst paste prepared by uniformly mixing the catalyst particles is configured by printing, applying or transferring the catalyst paste onto both surfaces 18a and 18b of the solid polymer electrolyte membrane 18.

第１ガス拡散層２０ｂ及び第２ガス拡散層２２ｂは、カーボンブラック及びＰＴＦＥ（ポリテトラフルオロエチレン）粒子を含む下地層をカーボンペーパの触媒層側に塗布して形成される。   The first gas diffusion layer 20b and the second gas diffusion layer 22b are formed by applying a base layer containing carbon black and PTFE (polytetrafluoroethylene) particles to the catalyst layer side of the carbon paper.

電解質膜・電極構造体１２には、樹脂体２４が一体化される。樹脂体２４は、電解質膜・電極構造体１２の短辺側の２辺（一方の両端部）に、例えば、溶着、接着、一体成形等により一体化される第１樹脂部材２４ａ及び第２樹脂部材２４ｂからのみ構成される。第１樹脂部材２４ａ及び第２樹脂部材２４ｂは、長辺方向略中央部が突出するとともに、両側が低くなる略山形形状を有する。   A resin body 24 is integrated with the electrolyte membrane / electrode structure 12. The resin body 24 includes a first resin member 24a and a second resin that are integrated on the two short sides (one end portion) of the electrolyte membrane / electrode structure 12 by, for example, welding, bonding, integral molding, or the like. It is comprised only from the member 24b. The first resin member 24a and the second resin member 24b have a substantially chevron shape in which a substantially central portion in the long side direction protrudes and both sides are lowered.

第１の実施形態では、図１及び図２に示すように、第１樹脂部材２４ａとカソード電極２０の第１ガス拡散層２０ｂとは、樹脂含浸部２５ａにより一体化される。第１樹脂部材２４ａとアノード電極２２の第２ガス拡散層２２ｂとは、樹脂含浸部２５ｂにより一体化される（図２参照）。   In the first embodiment, as shown in FIGS. 1 and 2, the first resin member 24a and the first gas diffusion layer 20b of the cathode electrode 20 are integrated by a resin-impregnated portion 25a. The first resin member 24a and the second gas diffusion layer 22b of the anode electrode 22 are integrated by a resin impregnated portion 25b (see FIG. 2).

図１及び図４に示すように、第２樹脂部材２４ｂとカソード電極２０の第１ガス拡散層２０ｂとは、樹脂含浸部２５ａにより一体化される。第２樹脂部材２４ｂとアノード電極２２の第２ガス拡散層２２ｂとは、樹脂含浸部２５ｂにより一体化される。   As shown in FIG.1 and FIG.4, the 2nd resin member 24b and the 1st gas diffusion layer 20b of the cathode electrode 20 are integrated by the resin impregnation part 25a. The second resin member 24b and the second gas diffusion layer 22b of the anode electrode 22 are integrated by a resin impregnated portion 25b.

樹脂含浸部２５ａ、２５ｂは、それぞれ第１樹脂部材２４ａ及び第２樹脂部材２４ｂに一体に設けられていてもよく、又は、別部材で構成される樹脂材を用意し、前記樹脂材を溶融させて第１ガス拡散層２０ｂ及び第２ガス拡散層２２ｂと前記第１樹脂部材２４ａ及び前記第２樹脂部材２４ｂとに一体に含浸させてもよい。   The resin impregnated portions 25a and 25b may be provided integrally with the first resin member 24a and the second resin member 24b, respectively, or a resin material made up of separate members is prepared and the resin material is melted. The first gas diffusion layer 20b and the second gas diffusion layer 22b, and the first resin member 24a and the second resin member 24b may be integrally impregnated.

第１樹脂部材２４ａ及び第２樹脂部材２４ｂ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）、シリコーンゴム、フッ素ゴム又はＥＰＤＭ（エチレンプロピレンゴム）等で構成される。   The first resin member 24a and the second resin member 24b are, for example, PPS (polyphenylene sulfide), PPA (polyphthalamide), PEN (polyethylene naphthalate), PES (polyethersulfone), LCP (liquid crystal polymer), It is composed of PVDF (polyvinylidene fluoride), silicone rubber, fluororubber, EPDM (ethylene propylene rubber), or the like.

図１に示すように、第１樹脂部材２４ａの第２セパレータ１６側の面には、後述する酸化剤ガス流路４２の入口側に対応する入口バッファ部２６ａが設けられる。第２樹脂部材２４ｂの第２セパレータ１６側の面には、酸化剤ガス流路４２の出口側に対応する出口バッファ部２６ｂが設けられる。入口バッファ部２６ａ及び出口バッファ部２６ｂは、複数の突起部により構成される。   As shown in FIG. 1, an inlet buffer portion 26a corresponding to an inlet side of an oxidant gas flow path 42 described later is provided on the surface of the first resin member 24a on the second separator 16 side. An outlet buffer portion 26b corresponding to the outlet side of the oxidant gas flow path 42 is provided on the surface of the second resin member 24b on the second separator 16 side. The inlet buffer portion 26a and the outlet buffer portion 26b are configured by a plurality of protrusions.

図４に示すように、第１樹脂部材２４ａの第１セパレータ１４側の面には、後述する燃料ガス流路３６の入口側に対応する入口バッファ部２８ａが設けられる。第２樹脂部材２４ｂの第１セパレータ１４側の面には、燃料ガス流路３６の出口側に対応する出口バッファ部２８ｂが設けられる。入口バッファ部２８ａ及び出口バッファ部２８ｂは、複数の突起部により構成される。   As shown in FIG. 4, an inlet buffer portion 28a corresponding to an inlet side of a fuel gas flow path 36 to be described later is provided on the surface of the first resin member 24a on the first separator 14 side. An outlet buffer portion 28b corresponding to the outlet side of the fuel gas flow path 36 is provided on the surface of the second resin member 24b on the first separator 14 side. The inlet buffer portion 28a and the outlet buffer portion 28b are configured by a plurality of protrusions.

図１に示すように、燃料電池１０の長辺方向（矢印Ｃ方向）の上端縁部には、矢印Ａ方向に互いに連通して、酸化剤ガス、例えば、酸素含有ガスを供給するための酸化剤ガス入口連通孔（反応ガス入口連通孔）３０ａ、及び燃料ガス、例えば、水素含有ガスを供給するための燃料ガス入口連通孔（反応ガス入口連通孔）３２ａが設けられる。   As shown in FIG. 1, an oxidation for supplying an oxidant gas, for example, an oxygen-containing gas, communicates with each other in the arrow A direction at the upper edge of the long side direction (arrow C direction) of the fuel cell 10. An agent gas inlet communication hole (reaction gas inlet communication hole) 30a and a fuel gas inlet communication hole (reaction gas inlet communication hole) 32a for supplying a fuel gas, for example, a hydrogen-containing gas, are provided.

燃料電池１０の長辺方向（矢印Ｃ方向）の下端縁部には、矢印Ａ方向に互いに連通して、燃料ガスを排出するための燃料ガス出口連通孔（反応ガス出口連通孔）３２ｂ、及び酸化剤ガスを排出するための酸化剤ガス出口連通孔（反応ガス出口連通孔）３０ｂが設けられる。   A fuel gas outlet communication hole (reactive gas outlet communication hole) 32b for communicating with each other in the direction of arrow A and discharging fuel gas is provided at the lower edge of the long side direction (arrow C direction) of the fuel cell 10, and An oxidant gas outlet communication hole (reaction gas outlet communication hole) 30b for discharging the oxidant gas is provided.

燃料電池１０の短辺方向（矢印Ｂ方向）の一端縁部には、矢印Ａ方向に互いに連通して、冷却媒体を供給するための冷却媒体入口連通孔３４ａが設けられるとともに、前記燃料電池１０の短辺方向の他端縁部には、前記冷却媒体を排出するための冷却媒体出口連通孔３４ｂが設けられる。   At one edge of the fuel cell 10 in the short side direction (arrow B direction), there is provided a cooling medium inlet communication hole 34a communicating with each other in the arrow A direction for supplying a cooling medium. A cooling medium outlet communication hole 34b for discharging the cooling medium is provided at the other end edge in the short side direction.

第１セパレータ１４の電解質膜・電極構造体１２に向かう面１４ａには、燃料ガス入口連通孔３２ａから燃料ガス出口連通孔３２ｂに連なる燃料ガス流路３６が形成される。燃料ガス流路３６の入口側（上端側）には、第１樹脂部材２４ａに設けられた入口バッファ部２８ａに当接する入口バッファ領域３８ａが実質的に平坦状に設けられる。入口バッファ領域３８ａの燃料ガス入口連通孔３２ａ側の端部には、複数の供給孔部４０ａが連通する。   On the surface 14a of the first separator 14 facing the electrolyte membrane / electrode structure 12, a fuel gas flow path 36 is formed that extends from the fuel gas inlet communication hole 32a to the fuel gas outlet communication hole 32b. On the inlet side (upper end side) of the fuel gas flow path 36, an inlet buffer region 38a that contacts the inlet buffer portion 28a provided in the first resin member 24a is provided in a substantially flat shape. A plurality of supply hole portions 40a communicate with the end portion of the inlet buffer region 38a on the fuel gas inlet communication hole 32a side.

燃料ガス流路３６の出口側（下端部）には、第２樹脂部材２４ｂに設けられた出口バッファ部２８ｂに当接する出口バッファ領域３８ｂが実質的に平坦状に設けられる。出口バッファ領域３８ｂの燃料ガス出口連通孔３２ｂ側の端部には、複数の排出孔部４０ｂが連通する。   On the outlet side (lower end portion) of the fuel gas flow path 36, an outlet buffer region 38b that abuts on the outlet buffer portion 28b provided in the second resin member 24b is provided in a substantially flat shape. A plurality of discharge hole portions 40b communicate with the end portion of the outlet buffer region 38b on the fuel gas outlet communication hole 32b side.

第２セパレータ１６の電解質膜・電極構造体１２に向かう面１６ａには、酸化剤ガス入口連通孔３０ａと酸化剤ガス出口連通孔３０ｂとに連通する酸化剤ガス流路４２が設けられる。酸化剤ガス流路４２の入口側（上端側）には、第１樹脂部材２４ａに設けられた入口バッファ部２６ａに当接する入口バッファ領域４４ａが実質的に平坦状に設けられる。酸化剤ガス流路４２の出口側（下端側）には、第２樹脂部材２４ｂの下端縁部に設けられた出口バッファ部２６ｂに当接する出口バッファ領域４４ｂが設けられる。   An oxidant gas flow path 42 communicating with the oxidant gas inlet communication hole 30a and the oxidant gas outlet communication hole 30b is provided on the surface 16a of the second separator 16 facing the electrolyte membrane / electrode structure 12. On the inlet side (upper end side) of the oxidant gas passage 42, an inlet buffer region 44a that abuts on the inlet buffer portion 26a provided in the first resin member 24a is provided in a substantially flat shape. On the outlet side (lower end side) of the oxidant gas flow path 42, an outlet buffer region 44b that abuts on the outlet buffer portion 26b provided on the lower end edge of the second resin member 24b is provided.

第１セパレータ１４の面１４ｂと第２セパレータ１６の面１６ｂとの間には、冷却媒体入口連通孔３４ａと冷却媒体出口連通孔３４ｂとを連通する冷却媒体流路４６が矢印Ｂ方向に設けられる。   Between the surface 14b of the first separator 14 and the surface 16b of the second separator 16, a cooling medium flow path 46 that communicates the cooling medium inlet communication hole 34a and the cooling medium outlet communication hole 34b is provided in the arrow B direction. .

図１〜図３に示すように、第１セパレータ１４の面１４ａ、１４ｂには、この第１セパレータ１４の外周端部を周回して、第１シール部材５０が一体化される。第２セパレータ１６の面１６ａ、１６ｂには、この第２セパレータ１６の外周端部を周回して、第２シール部材５２が一体化される。   As shown in FIGS. 1 to 3, the first seal member 50 is integrated with the surfaces 14 a and 14 b of the first separator 14 around the outer peripheral end portion of the first separator 14. The second seal member 52 is integrated with the surfaces 16 a and 16 b of the second separator 16 around the outer peripheral end of the second separator 16.

第１シール部材５０及び第２シール部材５２には、例えば、ＥＰＤＭ、ＮＢＲ、フッ素ゴム、シリコーンゴム、フロロシリコーンゴム、ブチルゴム、天然ゴム、スチレンゴム、クロロプレーン又はアクリルゴム等のシール材、クッション材、あるいはパッキン材が用いられる。   For the first seal member 50 and the second seal member 52, for example, EPDM, NBR, fluorine rubber, silicone rubber, fluorosilicone rubber, butyl rubber, natural rubber, styrene rubber, chloroprene or acrylic rubber or the like, cushion material Or a packing material is used.

このように構成される燃料電池１０の動作について、以下に説明する。   The operation of the fuel cell 10 configured as described above will be described below.

先ず、図１に示すように、酸化剤ガス入口連通孔３０ａには、酸素含有ガス等の酸化剤ガスが供給されるとともに、燃料ガス入口連通孔３２ａには、水素含有ガス等の燃料ガスが供給される。さらに、冷却媒体入口連通孔３４ａには、純水やエチレングリコール、オイル等の冷却媒体が供給される。   First, as shown in FIG. 1, an oxidant gas such as an oxygen-containing gas is supplied to the oxidant gas inlet communication hole 30a, and a fuel gas such as a hydrogen-containing gas is supplied to the fuel gas inlet communication hole 32a. Supplied. Further, a cooling medium such as pure water, ethylene glycol, or oil is supplied to the cooling medium inlet communication hole 34a.

このため、酸化剤ガスは、酸化剤ガス入口連通孔３０ａから第２セパレータ１６の酸化剤ガス流路４２に導入され、矢印Ｃ方向に移動して電解質膜・電極構造体１２のカソード電極２０に供給される。一方、燃料ガスは、燃料ガス入口連通孔３２ａから第１セパレータ１４の供給孔部４０ａを通って燃料ガス流路３６に導入される。燃料ガスは、燃料ガス流路３６に沿って矢印Ｃ方向に移動し、電解質膜・電極構造体１２のアノード電極２２に供給される。   For this reason, the oxidant gas is introduced into the oxidant gas flow path 42 of the second separator 16 from the oxidant gas inlet communication hole 30a and moves in the direction of arrow C to the cathode electrode 20 of the electrolyte membrane / electrode structure 12. Supplied. On the other hand, the fuel gas is introduced into the fuel gas flow path 36 from the fuel gas inlet communication hole 32 a through the supply hole 40 a of the first separator 14. The fuel gas moves in the direction of arrow C along the fuel gas flow path 36 and is supplied to the anode electrode 22 of the electrolyte membrane / electrode structure 12.

従って、電解質膜・電極構造体１２では、カソード電極２０に供給される酸化剤ガスと、アノード電極２２に供給される燃料ガスとが、電極触媒層内で電気化学反応により消費されて発電が行われる。   Therefore, in the electrolyte membrane / electrode structure 12, the oxidant gas supplied to the cathode electrode 20 and the fuel gas supplied to the anode electrode 22 are consumed by an electrochemical reaction in the electrode catalyst layer to generate power. Is called.

次いで、カソード電極２０に供給されて消費された酸化剤ガスは、酸化剤ガス出口連通孔３０ｂに沿って矢印Ａ方向に排出される。同様に、アノード電極２２に供給されて消費された燃料ガスは、排出孔部４０ｂを通り燃料ガス出口連通孔３２ｂに沿って矢印Ａ方向に排出される。   Next, the oxidant gas consumed by being supplied to the cathode electrode 20 is discharged in the direction of arrow A along the oxidant gas outlet communication hole 30b. Similarly, the fuel gas consumed by being supplied to the anode electrode 22 passes through the discharge hole 40b and is discharged in the direction of arrow A along the fuel gas outlet communication hole 32b.

また、冷却媒体入口連通孔３４ａに供給された冷却媒体は、第１セパレータ１４と第２セパレータ１６との間の冷却媒体流路４６に導入された後、矢印Ｂ方向に流通する。この冷却媒体は、電解質膜・電極構造体１２を冷却した後、冷却媒体出口連通孔３４ｂから排出される。   The cooling medium supplied to the cooling medium inlet communication hole 34 a is introduced into the cooling medium flow path 46 between the first separator 14 and the second separator 16 and then flows in the direction of arrow B. The cooling medium is discharged from the cooling medium outlet communication hole 34b after the electrolyte membrane / electrode structure 12 is cooled.

この場合、第１の実施形態では、図１及び図４に示すように、電解質膜・電極構造体１２に一体化される樹脂体２４は、入口バッファ部２６ａ、２８ａを設ける第１樹脂部材２４ａと、出口バッファ部２６ｂ、２８ｂを設ける第２樹脂部材２４ｂとからのみで構成されている。すなわち、樹脂体２４は、電解質膜・電極構造体１２の一方の両端部（短辺）にのみ設けられている。   In this case, in the first embodiment, as shown in FIGS. 1 and 4, the resin body 24 integrated with the electrolyte membrane / electrode structure 12 is a first resin member 24 a provided with inlet buffer portions 26 a and 28 a. And the second resin member 24b provided with the outlet buffer portions 26b and 28b. That is, the resin body 24 is provided only at one end (short side) of the electrolyte membrane / electrode structure 12.

このため、電解質膜・電極構造体１２の全周が樹脂体２４で覆われることがない。従って、電解質膜・電極構造体１２の製作時や燃料電池１０の運転時に、樹脂体２４（第１樹脂部材２４ａ及び第２樹脂部材２４ｂ）と第１ガス拡散層２０ｂ及び第２ガス拡散層２２ｂとの伸縮率の相違により発生する応力が、良好に低減される。   For this reason, the entire circumference of the electrolyte membrane / electrode structure 12 is not covered with the resin body 24. Accordingly, the resin body 24 (the first resin member 24a and the second resin member 24b), the first gas diffusion layer 20b, and the second gas diffusion layer 22b are produced when the electrolyte membrane / electrode structure 12 is manufactured or when the fuel cell 10 is operated. The stress generated by the difference in the expansion / contraction rate with respect to is satisfactorily reduced.

これにより、樹脂体２４が設けられた電解質膜・電極構造体１２に応力が発生することがなく、簡単且つ経済的な構成で、前記電解質膜・電極構造体１２の反りや剥離を良好に抑制することが可能になるという効果が得られる。   As a result, no stress is generated in the electrolyte membrane / electrode structure 12 provided with the resin body 24, and the warp and peeling of the electrolyte membrane / electrode structure 12 are satisfactorily suppressed with a simple and economical configuration. The effect that it becomes possible to obtain is obtained.

図５は、本発明の第２の実施形態に係る燃料電池を構成する電解質膜・電極構造体８０の正面説明図である。   FIG. 5 is an explanatory front view of an electrolyte membrane / electrode structure 80 constituting a fuel cell according to the second embodiment of the present invention.

なお、第１の実施形態に係る電解質膜・電極構造体１２と同一の構成要素には、同一の参照符号を付して、その詳細な説明は省略する。また、以下に説明する第３の実施形態においても同様に、その詳細な説明は省略する。   The same components as those of the electrolyte membrane / electrode structure 12 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Similarly, in the third embodiment described below, detailed description thereof is omitted.

電解質膜・電極構造体８０は、長方形状を有し、前記電解質膜・電極構造体８０に樹脂体８２が一体化される。樹脂体８２は、電解質膜・電極構造体８０の短辺側の２辺（一方の両端部）に、例えば、溶着、接着、一体成形等により一体化される第１樹脂部材８２ａ及び第２樹脂部材８２ｂからのみ構成される。   The electrolyte membrane / electrode structure 80 has a rectangular shape, and a resin body 82 is integrated with the electrolyte membrane / electrode structure 80. The resin body 82 includes a first resin member 82a and a second resin that are integrated with two sides (one end portion) on the short side of the electrolyte membrane / electrode structure 80 by, for example, welding, bonding, integral molding, or the like. It is comprised only from the member 82b.

第１樹脂部材８２ａの一方の面には、エンボスに代えて複数本のガイド流路溝８４ａが形成される。ガイド流路溝８４ａは、燃料ガス入口連通孔３２ａから燃料ガス流路３６に燃料ガスを案内する機能を有する。   A plurality of guide flow channel grooves 84a are formed on one surface of the first resin member 82a instead of embossing. The guide channel groove 84a has a function of guiding the fuel gas from the fuel gas inlet communication hole 32a to the fuel gas channel 36.

第２樹脂部材８２ｂの一方の面には、エンボスに代えて複数本のガイド流路溝８４ｂが形成される。ガイド流路溝８４ｂは、燃料ガス流路３６から燃料ガス出口連通孔３２ｂに燃料ガスを案内する機能を有する。   A plurality of guide channel grooves 84b are formed on one surface of the second resin member 82b in place of the emboss. The guide channel groove 84b has a function of guiding the fuel gas from the fuel gas channel 36 to the fuel gas outlet communication hole 32b.

第１樹脂部材８２ａの他方の面及び第２樹脂部材８２ｂの他方の面には、図示しないが、同様に複数本のガイド流路溝が形成される。このガイド流路溝は、酸化剤ガス入口連通孔３０ａ及び酸化剤ガス出口連通孔３０ｂと酸化剤ガス流路４２とを連結する。   Although not shown, a plurality of guide flow channel grooves are similarly formed on the other surface of the first resin member 82a and the other surface of the second resin member 82b. The guide channel groove connects the oxidant gas inlet communication hole 30 a, the oxidant gas outlet communication hole 30 b, and the oxidant gas channel 42.

このように構成される第２の実施形態では、上記の第１の実施形態と同様の効果が得られる。   In the second embodiment configured as described above, the same effect as in the first embodiment can be obtained.

図６は、本発明の第３の実施形態に係る燃料電池９０の要部断面説明図である。   FIG. 6 is an explanatory cross-sectional view of a main part of a fuel cell 90 according to the third embodiment of the present invention.

燃料電池９０は、電解質膜・電極構造体９２を第１セパレータ１４及び第２セパレータ１６で挟持する。電解質膜・電極構造体９２は、固体高分子電解質膜１８をカソード電極２０及びアノード電極２２により挟持するとともに、前記アノード電極２２は、前記カソード電極２０よりも表面積が小さい、所謂、段差ＭＥＡを構成する。   In the fuel cell 90, the electrolyte membrane / electrode structure 92 is sandwiched between the first separator 14 and the second separator 16. The electrolyte membrane / electrode structure 92 sandwiches the solid polymer electrolyte membrane 18 between the cathode electrode 20 and the anode electrode 22, and the anode electrode 22 constitutes a so-called step MEA having a smaller surface area than the cathode electrode 20. To do.

カソード電極２０を構成する第１電極触媒層２０ａとアノード電極２２を構成する第２電極触媒層２２ａとは、同一の表面積を有し、且つ、固体高分子電解質膜１８の表面積よりも小さな表面積に設定される。カソード電極２０を構成する第１ガス拡散層２０ｂは、アノード電極２２を構成する第２ガス拡散層２２ｂよりも大きな表面積に設定されるとともに、前記第１ガス拡散層２０ｂは、固体高分子電解質膜１８と同一の表面積に設定される。   The first electrode catalyst layer 20a constituting the cathode electrode 20 and the second electrode catalyst layer 22a constituting the anode electrode 22 have the same surface area and have a surface area smaller than the surface area of the solid polymer electrolyte membrane 18. Is set. The first gas diffusion layer 20b constituting the cathode electrode 20 is set to have a larger surface area than the second gas diffusion layer 22b constituting the anode electrode 22, and the first gas diffusion layer 20b is a solid polymer electrolyte membrane. 18 is set to the same surface area.

電解質膜・電極構造体９２には、樹脂体９４が一体化される。樹脂体９４は、電解質膜・電極構造体９２の短辺側の２辺（一方の両端部）に、例えば、溶着、接着、一体成形等により一体化される第１樹脂部材９４ａ及び第２樹脂部材（図示せず）からのみ構成される。   A resin body 94 is integrated with the electrolyte membrane / electrode structure 92. The resin body 94 includes a first resin member 94a and a second resin that are integrated with two sides (one end portion) on the short side of the electrolyte membrane / electrode structure 92 by, for example, welding, bonding, integral molding, or the like. It is comprised only from a member (not shown).

樹脂体９４を構成する第１樹脂部材９４ａは、段差ＭＥＡである電解質膜・電極構造体９２の外形形状に対応して段差部位９６を有する。第１樹脂部材９４ａとカソード電極２０の第１ガス拡散層２０ｂとは、樹脂含浸部９８ａにより一体化される。第１樹脂部材９４ａとアノード電極２２の第２ガス拡散層２２ｂとは、樹脂含浸部９８ｂにより一体化される。   The first resin member 94a constituting the resin body 94 has a step portion 96 corresponding to the outer shape of the electrolyte membrane / electrode structure 92 which is a step MEA. The first resin member 94a and the first gas diffusion layer 20b of the cathode electrode 20 are integrated by a resin impregnated portion 98a. The first resin member 94a and the second gas diffusion layer 22b of the anode electrode 22 are integrated by a resin impregnated portion 98b.

なお、図示しないが、樹脂体９４を構成する第２樹脂部材も、上記の第１樹脂部材９４ａと同様に構成される。   In addition, although not shown in figure, the 2nd resin member which comprises the resin body 94 is also comprised similarly to said 1st resin member 94a.

このように構成される第３の実施形態では、樹脂体９４は、電解質膜・電極構造体９２の一方の両端部（短辺）にのみ設けられており、前記電解質膜・電極構造体９２の全周が樹脂体９４で覆われることがない。これにより、樹脂体９４が設けられた電解質膜・電極構造体９２に応力が発生することがなく、簡単且つ経済的な構成で、前記電解質膜・電極構造体９２の反りや剥離を良好に抑制することが可能になる等、上記の第１の実施形態と同様の効果が得られる。   In the third embodiment configured as described above, the resin body 94 is provided only on one end (short side) of the electrolyte membrane / electrode structure 92. The entire circumference is not covered with the resin body 94. As a result, no stress is generated in the electrolyte membrane / electrode structure 92 provided with the resin body 94, and the warp and separation of the electrolyte membrane / electrode structure 92 are satisfactorily suppressed with a simple and economical configuration. The same effects as those of the first embodiment can be obtained.

なお、第３の実施形態では、アノード電極２２は、カソード電極２０よりも表面積が小さく構成されているが、これとは逆に、前記カソード電極２０は、前記アノード電極２２よりも表面積が小さく構成されてもよい。   In the third embodiment, the anode electrode 22 has a smaller surface area than the cathode electrode 20. On the contrary, the cathode electrode 20 has a smaller surface area than the anode electrode 22. May be.

１０、９０…燃料電池
１２、８０、９２…電解質膜・電極構造体
１４、１６…セパレータ １８…固体高分子電解質膜
２０…カソード電極 ２０ａ、２２ａ…電極触媒層
２０ｂ、２２ｂ…ガス拡散層 ２２…アノード電極
２４、８２、９４…樹脂体
２４ａ、２４ｂ、８２ａ、８２ｂ、９４ａ…樹脂部材
２５ａ、２５ｂ、９８ａ、９８ｂ…樹脂含浸部
２６ａ、２８ａ…入口バッファ部 ２６ｂ、２８ｂ…出口バッファ部
３０ａ…酸化剤ガス入口連通孔 ３０ｂ…酸化剤ガス出口連通孔
３２ａ…燃料ガス入口連通孔 ３２ｂ…燃料ガス出口連通孔
３４ａ…冷却媒体入口連通孔 ３４ｂ…冷却媒体出口連通孔
３６…燃料ガス流路 ４２…酸化剤ガス流路
４６…冷却媒体流路 ５０、５２…シール部材
８４ａ、８４ｂ…ガイド流路溝 DESCRIPTION OF SYMBOLS 10, 90 ... Fuel cell 12, 80, 92 ... Electrolyte membrane and electrode structure 14, 16 ... Separator 18 ... Solid polymer electrolyte membrane 20 ... Cathode electrode 20a, 22a ... Electrode catalyst layer 20b, 22b ... Gas diffusion layer 22 ... Anode electrodes 24, 82, 94 ... resin bodies 24a, 24b, 82a, 82b, 94a ... resin members 25a, 25b, 98a, 98b ... resin impregnated portions 26a, 28a ... inlet buffer portions 26b, 28b ... outlet buffer portions 30a ... oxidation Agent gas inlet communication hole 30b ... Oxidant gas outlet communication hole 32a ... Fuel gas inlet communication hole 32b ... Fuel gas outlet communication hole 34a ... Cooling medium inlet communication hole 34b ... Cooling medium outlet communication hole 36 ... Fuel gas flow path 42 ... Oxidation Agent gas flow path 46 ... Cooling medium flow path 50, 52 ... Seal members 84a, 84b ... Guide flow path grooves

Claims (4)

固体高分子電解質膜の一方の面に、第１触媒層及び第１ガス拡散層を有する第１電極が配設され、且つ前記固体高分子電解質膜の他方の面に、第２触媒層及び第２ガス拡散層を有する第２電極が配設される電解質膜・電極構造体と、
電極面に沿って反応ガスを供給する反応ガス流路がセパレータ面内に形成されるとともに、前記反応ガス流路の入口側に連通して前記セパレータ面を貫通する反応ガス入口連通孔、及び前記反応ガスの出口側に連通して前記セパレータ面を貫通する反応ガス出口連通孔が形成されるセパレータと、
を備える燃料電池であって、
前記電解質膜・電極構造体は、矩形状を有するとともに、
一方の両端部を構成する第１辺に一体化される第１樹脂部材と、
前記一方の両端部を構成する第２辺に一体化される第２樹脂部材と、
のみからなる樹脂体を備え、
前記第１樹脂部材は、前記反応ガス流路の入口側と前記反応ガス入口連通孔との間に位置して前記セパレータに積層される入口バッファ部を設け、
前記第２樹脂部材は、前記反応ガス流路の出口側と前記反応ガス出口連通孔との間に位置して前記セパレータに積層される出口バッファ部を設けることを特徴とする燃料電池。 A first electrode having a first catalyst layer and a first gas diffusion layer is disposed on one surface of the solid polymer electrolyte membrane, and a second catalyst layer and a second electrode are disposed on the other surface of the solid polymer electrolyte membrane. An electrolyte membrane / electrode structure in which a second electrode having two gas diffusion layers is disposed;
A reaction gas channel for supplying a reaction gas along the electrode surface is formed in the separator surface, and a reaction gas inlet communication hole that communicates with the inlet side of the reaction gas channel and penetrates the separator surface; and A separator in which a reaction gas outlet communication hole communicating with the reaction gas outlet side and penetrating the separator surface is formed;
A fuel cell comprising:
The electrolyte membrane / electrode structure has a rectangular shape,
A first resin member integrated with a first side constituting one end portion;
A second resin member integrated with a second side constituting the one end portion;
Equipped with a resin body consisting only of
The first resin member is provided between an inlet side of the reaction gas flow path and the reaction gas inlet communication hole, and is provided with an inlet buffer portion stacked on the separator,
The fuel cell according to claim 1, wherein the second resin member is provided between an outlet side of the reaction gas flow path and the reaction gas outlet communication hole, and an outlet buffer portion stacked on the separator is provided. 請求項１記載の燃料電池において、前記第１樹脂部材及び前記第２樹脂部材には、複数の突起部又はガイド流路溝が一体に設けられることを特徴とする燃料電池。   2. The fuel cell according to claim 1, wherein the first resin member and the second resin member are integrally provided with a plurality of protrusions or guide channel grooves. 請求項１又は２記載の燃料電池において、前記電解質膜・電極構造体は、長方形状を有し、短辺側の２辺に前記第１樹脂部材及び前記第２樹脂部材が含浸又は接着により一体化されることを特徴とする燃料電池。   3. The fuel cell according to claim 1 or 2, wherein the electrolyte membrane / electrode structure has a rectangular shape, and the first resin member and the second resin member are integrally impregnated or adhered to two sides on the short side. A fuel cell characterized by being made. 請求項３記載の燃料電池において、前記電解質膜・電極構造体の長辺側の２辺で、前記第１ガス拡散層の平面寸法は、前記第２ガス拡散層の平面寸法よりも大きな寸法に設定されることを特徴とする燃料電池。   4. The fuel cell according to claim 3, wherein a planar dimension of the first gas diffusion layer is larger than a planar dimension of the second gas diffusion layer on two long sides of the electrolyte membrane / electrode structure. A fuel cell characterized by being set.
JP2012014699A 2012-01-27 2012-01-27 Fuel cell Pending JP2013157093A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015207438A (en) * 2014-04-21 2015-11-19 本田技研工業株式会社 fuel cell
JP2017033800A (en) * 2015-08-03 2017-02-09 日産自動車株式会社 Membrane electrode assembly and fuel cell including the same
EP3439091A1 (en) * 2017-08-04 2019-02-06 Toyota Jidosha Kabushiki Kaisha Separator for fuel cell, fuel cell, and manufacturing method of separator for fuel cell
US10756356B2 (en) 2017-08-04 2020-08-25 Toyota Jidosha Kabushiki Kaisha Manufacturing method of separator for fuel cell

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015207438A (en) * 2014-04-21 2015-11-19 本田技研工業株式会社 fuel cell
JP2017033800A (en) * 2015-08-03 2017-02-09 日産自動車株式会社 Membrane electrode assembly and fuel cell including the same
EP3439091A1 (en) * 2017-08-04 2019-02-06 Toyota Jidosha Kabushiki Kaisha Separator for fuel cell, fuel cell, and manufacturing method of separator for fuel cell
US10756356B2 (en) 2017-08-04 2020-08-25 Toyota Jidosha Kabushiki Kaisha Manufacturing method of separator for fuel cell

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