JP2005197187A - Separator for fuel cell and its manufacturing method - Google Patents

Separator for fuel cell and its manufacturing method Download PDF

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JP2005197187A
JP2005197187A JP2004004728A JP2004004728A JP2005197187A JP 2005197187 A JP2005197187 A JP 2005197187A JP 2004004728 A JP2004004728 A JP 2004004728A JP 2004004728 A JP2004004728 A JP 2004004728A JP 2005197187 A JP2005197187 A JP 2005197187A
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fuel cell
separator
members
hole
peripheral wall
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Seiji Sano
誠治 佐野
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Toyota Motor Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/50Fuel cells
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Abstract

<P>PROBLEM TO BE SOLVED: To provide a separator for a fuel cell capable of preventing displacement between members due to external force generated by vibration, thermal expansion difference or the like, in a separator for a fuel cell having a plurality of members; and to provide its manufacturing method. <P>SOLUTION: A plurality of members I and II are stacked and jointed in the surface direction of a unit cell; one-side member I and the other-side member II out of the plurality of members are made adjacent to each other to form joint surfaces 7a and 7b; in at least one of the joint surfaces, at least a part of the other-side member is provided with a projecting part projecting the joint surface; and at least a part of the projecting part is made to bite into the inside of the one-side member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、燃料電池に用いられるセパレータに関し、特に複数の部材からなるセパレータとその製造方法に関する。   The present invention relates to a separator used in a fuel cell, and more particularly to a separator composed of a plurality of members and a method for manufacturing the same.

燃料電池の代表的な構成要素であるセパレータは、ユニットセルにおけるガスの気密性を保つ流路を形成するとともにセルで発生した電気を通す導体の役割をも担っている。ユニットセルと交互に積層されるセパレータには、様々な性能が要求される。まず、反応により発生した電子を集電し、隣り合うセル間の電気的コネクターとしての役割をも担うことから、良好な導電性が必要とされる。また、セパレータは、反応ガスのみではなく部分的に電極にも接触しているため、アノード電位、カソード電位、還元雰囲気、酸化雰囲気において化学的に安定であることが求められる。加えて、自動車等移動体の動力源として使用される場合には、耐振動性のほか、機械的強度等が要求される。さらに、反応ガスである水素と酸素とが混合しないように分離したまま電解質膜の反応面全体に供給するため、ガス不透過性が必要とされる場合もある。   A separator, which is a typical component of a fuel cell, forms a flow path that keeps gas tightness in a unit cell, and also serves as a conductor for conducting electricity generated in the cell. Various performances are required for separators stacked alternately with unit cells. First, since the electrons generated by the reaction are collected and also serve as an electrical connector between adjacent cells, good conductivity is required. Further, since the separator is not only in contact with the reaction gas but also partially in contact with the electrode, it is required to be chemically stable in the anode potential, cathode potential, reducing atmosphere, and oxidizing atmosphere. In addition, when used as a power source for a moving body such as an automobile, mechanical strength is required in addition to vibration resistance. In addition, gas impermeability may be required because hydrogen and oxygen, which are reactant gases, are supplied to the entire reaction surface of the electrolyte membrane while being separated so as not to mix.

燃料電池用セパレータを構成する材料に関しては、種々の検討が行われてきており、さらに、燃料電池に対する要求水準が高められるにつれ、セパレータ各部位に対する上記要求性能及びその水準が異なることに着目して、それぞれの要求性能、水準を満たす複数の部材からなり、これらの部材を接合等して一体化したセパレータが検討されるようになってきている。特許文献1には、ガス流路部材と枠体部材とを一体成形してなる燃料電池用セパレータにおいて、ガス流路部材用の予備成形体と枠体部材用の予備成形体とを金型に挿入し、一体に熱圧成形する技術が開示されている。また、かかる関連分野に関する技術を開示するものとして特許文献2がある。
特開2002−63913号公報 特開2001−283880号公報
Various studies have been conducted on the materials constituting the fuel cell separator, and further, as the required level for fuel cells is increased, the required performance for each part of the separator and its level differ. A separator that is composed of a plurality of members satisfying the respective required performances and standards and that integrates these members by joining or the like has been studied. In Patent Document 1, in a fuel cell separator formed by integrally molding a gas flow path member and a frame member, a preform for the gas flow path member and a preform for the frame member are used as a mold. A technique for inserting and integrally hot pressing is disclosed. Patent Document 2 discloses a technique related to the related field.
JP 2002-63913 A JP 2001-283880 A

しかし、複数の部材により構成し、一体化された燃料電池用セパレータは、作動時や移動時等の振動や高温作動時に生じる熱膨張差によって、部材間にずれが生じるおそれがあるという問題があった。   However, the fuel cell separator composed and integrated with a plurality of members has a problem that the members may be displaced due to vibration during operation, movement, or the like, or thermal expansion difference generated during high temperature operation. It was.

そこで、本発明は、複数の部材を一体化して構成された燃料電池用セパレータにおいて、振動や熱膨張差等により生じる外部の力による部材間のずれを防止することを可能にする燃料電池用セパレータ、及びその製造方法を提供することを課題とする。   Accordingly, the present invention provides a fuel cell separator that is configured by integrating a plurality of members, and that can prevent displacement between members due to an external force caused by vibration, thermal expansion difference, or the like. And a method for manufacturing the same.

上記課題を解決するために本発明は以下の解決手段をとる。すなわち、
請求項1に記載の発明は、ユニットセルの面方向に複数の部材が積層されて接合され、複数の部材のうちの一の部材と他の部材とが隣接して接合面を形成するとともに、少なくとも一つの接合面において、他の部材には少なくとも一部に接合面から突出する凸部が備えられ、凸部の少なくとも一部は、一の部材の内部側に喰い込んでいることを特徴とする、燃料電池用セパレータを提供するものである。
In order to solve the above problems, the present invention takes the following solution. That is,
In the first aspect of the present invention, a plurality of members are stacked and bonded in the surface direction of the unit cell, and one member of the plurality of members and another member are adjacent to form a bonding surface, In at least one joint surface, at least a part of the other member is provided with a convex portion protruding from the joint surface, and at least a part of the convex portion bites into an inner side of the one member. A fuel cell separator is provided.

請求項1に記載の発明によれば、他の部材側に設けられた凸部が、一の部材の内部側に突出して喰い込むので、燃料電池用セパレータを構成する両部材の接合面内のずれを防止することができる。   According to the first aspect of the present invention, since the convex portion provided on the other member side protrudes and bites into the inner side of the one member, it is within the joint surface of both members constituting the fuel cell separator. Deviation can be prevented.

請求項2に記載の発明は、請求項1に記載の燃料電池用セパレータにおいて、凸部を備える他の部材の硬さは、それに接合されている一の部材の硬さより大であることを特徴とする。   The invention according to claim 2 is the fuel cell separator according to claim 1, wherein the hardness of the other member having the convex portion is larger than the hardness of the one member joined thereto. And

請求項2に記載の発明によれば、凸部の硬さは一の部材よりも大きいので、他の部材に設けられた凸部を一の部材側に喰い込ませて、両部材を一体化することが容易となる。   According to invention of Claim 2, since the hardness of a convex part is larger than one member, the convex part provided in the other member was bitten into the one member side, and both members were integrated. Easy to do.

請求項3に記載の発明は、請求項1または2に記載の燃料電池用セパレータにおいて、複数の部材はユニットセルの面方向と直交する方向に形成された穴を有する第1部材と、穴の内周壁と略同一形状の外周壁を備えた第2部材とを含み、第1部材の穴に第2部材が配設され、内周壁と外周壁とが当接されて接合面を形成していることを特徴とする。   According to a third aspect of the present invention, in the fuel cell separator according to the first or second aspect, the plurality of members have a first member having a hole formed in a direction orthogonal to the surface direction of the unit cell, A second member having an outer peripheral wall having substantially the same shape as the inner peripheral wall, the second member is disposed in the hole of the first member, and the inner peripheral wall and the outer peripheral wall are brought into contact with each other to form a joining surface. It is characterized by being.

請求項3に記載の発明によれば、第1部材と第2部材とは嵌合構造となるので、第1部材の穴に第2部材をはめ込むだけで、両部材を一体化することができる。   According to the invention described in claim 3, since the first member and the second member have a fitting structure, both members can be integrated only by fitting the second member into the hole of the first member. .

請求項4に記載の発明は、請求項3に記載の燃料電池用セパレータにおいて、第2部材は第1部材を構成する材料より大きな硬さを有する多孔質材料により形成されていることを特徴とする。   According to a fourth aspect of the present invention, in the fuel cell separator according to the third aspect, the second member is formed of a porous material having a hardness greater than that of the material constituting the first member. To do.

請求項4に記載の発明によれば、大きな硬さを持つ第2部材の凸部が第1部材に容易に喰い込むので、両部材間にずれ防止効果を容易に生じさせることができる。また、多孔質材料は、それ自体凸部を備えるので、凸部を加工により形成する必要がない。   According to invention of Claim 4, since the convex part of the 2nd member with big hardness easily bites into the 1st member, the shift prevention effect can be easily produced between both members. Moreover, since the porous material itself has a convex portion, it is not necessary to form the convex portion by processing.

請求項5に記載の発明は、ユニットセルの面方向と直交する方向に貫通孔を形成した第1部材と、第1部材より大きな硬さを有する多孔質物質にて貫通孔の形状に形成した第2部材とを具備し、第1部材の貫通孔に第2部材を押し込んで接合した燃料電池用セパレータであって、第1部材と第2部材とがなす接合面では、第2部材が有する凸部が、第1部材内部側に喰い込んでいる燃料電池用セパレータを提供するものである。   The invention according to claim 5 is formed in the shape of a through hole with a first member having a through hole formed in a direction orthogonal to the surface direction of the unit cell, and a porous material having hardness greater than that of the first member. A separator for a fuel cell that includes a second member and is joined by pushing the second member into a through-hole of the first member, and the second member has a joint surface formed by the first member and the second member. The convex part is provided with a separator for a fuel cell that bites into the inside of the first member.

請求項5の発明によれば、第1部材の貫通孔内に押し込んで接合された第2部材が多孔質物質で形成されているので、その微小な凸部が第1部材の内部に喰い込んで両部材間のずれを防止することができる。   According to the invention of claim 5, since the second member pushed into the through hole of the first member and joined is formed of the porous material, the minute convex portion bites into the inside of the first member. Therefore, it is possible to prevent the displacement between the two members.

請求項6に記載の発明は、燃料電池用セパレータの製造方法であって、ユニットセルの面方向と直交する方向に貫通孔を有する第1部材を形成する第1工程と、第1部材よりも大きな硬さを有する材料により貫通孔の内周壁と略同一形状を有するとともに少なくとも一部に凸部を有する外周壁を備える第2部材を形成する第2工程と、第2部材を第1部材の貫通孔に押し込む第3工程とを含み、第3工程により第2部材外周壁凸部の少なくとも一部が、第1部材の貫通孔内周壁内に喰い込むように、第1及び2工程において第1及び2部材を形成することを特徴とする、燃料電池用セパレータの製造方法を提供するものである。   Invention of Claim 6 is a manufacturing method of the separator for fuel cells, Comprising: The 1st process of forming the 1st member which has a through-hole in the direction orthogonal to the surface direction of a unit cell, Than the 1st member A second step of forming a second member having an outer peripheral wall having substantially the same shape as the inner peripheral wall of the through-hole and having a convex portion at least in part by a material having a large hardness; A third step of pushing into the through-hole, and the third step in the first and second steps so that at least a part of the convex portion of the second member outer peripheral wall bites into the inner peripheral wall of the first member through the third step. The present invention provides a method for producing a separator for a fuel cell, characterized by forming 1 and 2 members.

請求項6に記載の発明によれば、2つの部材からなる燃料電池用セパレータに関して、第1部材と第2部材とが接合面でずれることを抑制できる燃料電池用セパレータを、簡単な方法により製造することができる。   According to the sixth aspect of the present invention, a fuel cell separator that can suppress the displacement of the first member and the second member at the joining surface with respect to the fuel cell separator composed of two members is manufactured by a simple method. can do.

本発明の燃料電池用セパレータとその製造方法によれば、2以上の部材を有する燃料電池用セパレータにおいて、振動等の外部力による部材間のずれを防止することが可能となり、当該特徴を有する燃料電池用セパレータを容易に製造する方法を提供することができる。   According to the fuel cell separator of the present invention and the manufacturing method thereof, in the fuel cell separator having two or more members, it is possible to prevent the displacement between the members due to external force such as vibration, and the fuel having the characteristics. A method for easily producing a battery separator can be provided.

図1は、本発明の一実施形態としての燃料電池用セパレータを示す断面図である。燃料電池用セパレータ100は、第1部材Iと、第2部材IIとを備え、これら2部材が燃料電池スタックを組み立てる際にユニットセルの面方向(図1における紙面上下方向)に積層して配置されている。第1部材Iは、例えばアルミニウム等の金属材料にて形成されている。第2部材は、ポーラスな(多孔質)ステンレス鋼等の金属材料により形成されている。第2部材IIの硬さは第1部材Iの硬さより大きい。第1部材Iと、第2部材IIとは、後に説明する接合方法により形成した接合面7a、7b(図1において、楕円形の鎖線により囲まれている部分)を介して一体化されている。   FIG. 1 is a cross-sectional view showing a fuel cell separator as one embodiment of the present invention. The fuel cell separator 100 includes a first member I and a second member II, and these two members are stacked in the surface direction of the unit cell (the vertical direction in the drawing in FIG. 1) when assembling the fuel cell stack. Has been. The first member I is formed of a metal material such as aluminum. The second member is made of a metal material such as porous (porous) stainless steel. The hardness of the second member II is greater than the hardness of the first member I. The first member I and the second member II are integrated via bonding surfaces 7a and 7b (portions surrounded by elliptical chain lines in FIG. 1) formed by a bonding method described later. .

燃料電池用セパレータ100を構成する第1部材Iの表面には、燃料電池内部の電気化学反応により発生した熱を冷やすための冷却水通水溝5、5、5、…と、この冷却水及び下記する冷却用空気のシールをはかるガスケットが配置されるべき溝4、4、4が刻設されている。また、第2部材IIの表面には、上記熱を冷やすための冷却用空気の通気溝6、6、6が刻設されている。   On the surface of the first member I constituting the fuel cell separator 100, cooling water flow grooves 5, 5, 5,... For cooling the heat generated by the electrochemical reaction inside the fuel cell, and the cooling water and Grooves 4, 4, and 4 are provided in which gaskets for sealing the cooling air described below are to be disposed. Further, on the surface of the second member II, there are engraved cooling air ventilation grooves 6, 6, 6 for cooling the heat.

図2は、燃料電池用セパレータ100をカソード側に配置して構成された燃料電池のユニットセルを示す図である。なお、図1において説明したものと同一の部材等がある場合には、図1と同一の参照符号を付してその説明を省略する。ユニットセル500は、アノード210とカソード110とが、膜/電極接合体(MEA(Membrane Electrode Assembly))150を両側から挟み込むように配置されている。本発明にかかる燃料電池用セパレータ100は、電気化学反応による熱が発生するカソード110側に配置され、これと対をなすアノード210側には、全体が金属材料で形成されたアノード側セパレータ200が配置されている。さらに、ユニットセル500を積層して燃料電池スタックを構成し、燃料電池として使用される。   FIG. 2 is a diagram showing a unit cell of a fuel cell configured by disposing the fuel cell separator 100 on the cathode side. In addition, when there exists the same member as what was demonstrated in FIG. 1, the same referential mark as FIG. 1 is attached | subjected and the description is abbreviate | omitted. In the unit cell 500, the anode 210 and the cathode 110 are arranged so as to sandwich a membrane / electrode assembly (MEA (Membrane Electrode Assembly)) 150 from both sides. The separator 100 for a fuel cell according to the present invention is disposed on the cathode 110 side where heat is generated by an electrochemical reaction, and an anode side separator 200 formed entirely of a metal material is disposed on the anode 210 side that makes a pair with the separator. Has been placed. Further, the unit cells 500 are stacked to constitute a fuel cell stack, which is used as a fuel cell.

燃料電池の作動状態においては、カソード110側では、
2H+2e+(1/2)O→H
なる反応が進行し、カソード110の下流側は上記反応により生成された水により水分リッチな雰囲気となる。
In the operating state of the fuel cell, on the cathode 110 side,
2H + + 2e + (1/2) O 2 → H 2 O
And the downstream side of the cathode 110 becomes a moisture-rich atmosphere due to the water generated by the reaction.

一方、カソード110側のセパレータ100では、反応により生じた熱を冷却するため、通水溝5、5、5、…には冷却水が、通気溝6、6、6にはドライな冷却用空気が供給されている。一方、カソード下流側では生成水リッチとなっているため、両者の水の分圧差によって、水は多孔質体を通過して通気溝側に移動し、冷却用空気を加湿する。この加湿された冷却用空気は、その後カソード110に供給されて、上記反応にあずかるとともに、MEA150を適度な水分に保つ。したがって、かかる構成をとることにより、カソード110下流側でのフラッディングを抑制し、カソード110に供給する空気の加湿器設置を省略することが可能になる。   On the other hand, in the separator 100 on the cathode 110 side, in order to cool the heat generated by the reaction, cooling water is supplied to the water flow grooves 5, 5, 5,..., And dry cooling air is supplied to the air grooves 6, 6, 6. Is supplied. On the other hand, since the generated water is rich on the downstream side of the cathode, the water passes through the porous body and moves to the ventilation groove side due to the partial pressure difference between the two, and humidifies the cooling air. The humidified cooling air is then supplied to the cathode 110 to participate in the above reaction and keep the MEA 150 at a proper moisture content. Therefore, by adopting such a configuration, flooding on the downstream side of the cathode 110 can be suppressed, and installation of a humidifier for the air supplied to the cathode 110 can be omitted.

再び図1に戻り説明を続ける。本実施形態にかかる燃料電池用セパレータ100において、第2部材IIは多孔質なステンレス鋼により形成されておりその硬さは、アルミニウムで形成された第1部材Iの硬さよりも大きい。第2部材IIは、その多孔質ステンレス鋼の表面の微細な凸部が第1部材Iとの接合面7a、7bから第1部材Iの内部へと喰い込んでいる。このような構成をとるため、第1部材Iには、ユニットセル500の面方向に直交する方向(図の左右方向)に、あらかじめ第2部材IIの大きさよりわずかに小さな形状の貫通孔50が形成されている。この貫通孔50に硬さが大きく多孔質ステンレス鋼材料で形成された第2部材IIを上記面方向に直交する方向に押し込んで燃料電池用セパレータ100を形成する。このように形成された燃料電池用セパレータ100は、多孔質ステンレス鋼材料からなる第2部材IIの微小な凸部が第1部材Iに喰い込んでいるため、二部材が堅固に一体化され、作動時や移動時等の振動や高温作動時に生じる熱膨張差によって、部材間にずれが生じることが防止される。またかかる燃料電池用セパレータ100は、第1部材Iの貫通孔50に第2部材IIを押し込むという簡易な加工で作製することができる。   Returning to FIG. 1 again, the description will be continued. In the fuel cell separator 100 according to the present embodiment, the second member II is formed of porous stainless steel, and the hardness thereof is greater than the hardness of the first member I formed of aluminum. As for the 2nd member II, the fine convex part of the surface of the porous stainless steel bites into the inside of the 1st member I from the joint surfaces 7a and 7b with the 1st member I. In order to take such a configuration, the first member I has a through-hole 50 having a shape slightly smaller than the size of the second member II in advance in a direction orthogonal to the surface direction of the unit cell 500 (left-right direction in the figure). Is formed. The fuel cell separator 100 is formed by pushing the second member II, which has a large hardness and is made of a porous stainless steel material, into the through hole 50 in a direction perpendicular to the plane direction. In the fuel cell separator 100 formed in this way, the minute protrusions of the second member II made of a porous stainless steel material bite into the first member I, so the two members are firmly integrated, It is possible to prevent deviations between members due to vibration during operation or movement, or thermal expansion differences that occur during high temperature operation. Further, the fuel cell separator 100 can be manufactured by a simple process of pushing the second member II into the through hole 50 of the first member I.

以上に本発明にかかる燃料電池用セパレータの一実施形態について説明したが、以下においては上記実施形態をさらに一般化して本発明を説明する。   Although one embodiment of the fuel cell separator according to the present invention has been described above, the present invention will be described below by further generalizing the above embodiment.

本発明は、ユニットセルの面方向に複数の部材を積層して接合する燃料電池用セパレータを提供するものである。このように複数の部材を燃料電池用セパレータに使用するのは、セパレータの部位により、セパレータとして要求される性能/水準が異なることに対応して、セパレータ全体として性能の最適化をはかるためである。例えば、上記実施形態において説明したように、セパレータを複数の部材で構成して、そのうちの一部材のみ多孔質材料で構成することにより、その部分にガス及び/または液体の透過性、浸透性を付与し、他の部分はガス不透過性にすることが考えられる。また、一部分のみを、異なる熱伝導性、異なる耐食性を有する材料により構成して、燃料電池用セパレータとして、特有の機能、性能を強化することなどが考えられる。   The present invention provides a fuel cell separator in which a plurality of members are stacked and joined in the surface direction of a unit cell. The reason why a plurality of members are used in the fuel cell separator is to optimize the performance of the separator as a whole in response to the difference in performance / level required for the separator depending on the location of the separator. . For example, as described in the above embodiment, the separator is composed of a plurality of members, and only one of the members is composed of a porous material, so that gas and / or liquid permeability and permeability can be imparted to the portion. It is conceivable that other parts are made gas impermeable. In addition, it is conceivable that only a part is composed of materials having different thermal conductivities and different corrosion resistances so as to enhance the specific functions and performance as a fuel cell separator.

図3は、この様な複数の部材により構成された燃料電池用セパレータの一実施形態を概略的に示す斜視図である。なお、以下の説明においては、燃料電池用セパレータを構成する複数の部材の(板状の)概略形状のみ示し、表面に形成されている流路等は省略して表す。この実施形態では、図3(a)に示すように、ユニットセルの面方向に直交する方向に穴2が形成された第1部材Iと、穴2と同一形状に、形成された第2部材IIとが別体に製造される。そして図3(b)に示すように、第1部材Iの穴2の内部に第2部材IIを配置することにより、二部材からなる燃料電池用セパレータ10が作製される。   FIG. 3 is a perspective view schematically showing one embodiment of a separator for a fuel cell constituted by such a plurality of members. In the following description, only the schematic shapes (plate-like) of a plurality of members constituting the fuel cell separator are shown, and flow paths and the like formed on the surface are omitted. In this embodiment, as shown in FIG. 3A, the first member I in which the hole 2 is formed in a direction orthogonal to the surface direction of the unit cell, and the second member formed in the same shape as the hole 2 II is manufactured separately. Then, as shown in FIG. 3 (b), the second member II is disposed inside the hole 2 of the first member I, whereby the fuel cell separator 10 composed of two members is produced.

図4は、第1部材Iと第2部材IIとの接合面の断面を概念的に示す拡大図である。本発明において、複数の部材のうち、一の部材と隣接して接合面を形成する他の部材の少なくとも一部には接合面から突出する凸部が備えられ、凸部の少なくとも一部は、他の部材と接合されている一の部材の内部側に喰い込んでいる。なお、図4においては、接合面が鎖線Xで示されている。図4(a)〜(c)に示されるように、第2部材IIには第1部材Iに面する側に多数の凸部21a、21a、21a、…(図4(a));21b、21b、21b、…(図4(b));21c、21c、21c、…(図4(c))が、接合面Xから突出するように形成されている。これら凸部は、図4(a)に示されているようにその先端側の一部が第1部材Iの内部側に突出していてもよいし、図4(b)のように全体が第1部材Iの内部側に喰い込むように突出していてもよい。なお、上記説明では、第2部材IIに凸部が設けられていることを前提としているが、第1部材Iに凸部を設けて第2部材IIの内部側に突出させても同様の効果を得ることができる。また、ここにいう接合面は、マクロ的には、第1部材Iと第2部材IIとが当接している面であり、ミクロ的には、図4において鎖線Xにより示されているように、両部材の中間にあって両部材間を仕切る仮想面である。凸部は必ずしも接合面全体に形成されている必要はなく、両部材間のずれを防止できる範囲において適宜配置されていればよい。   FIG. 4 is an enlarged view conceptually showing a cross section of the joint surface between the first member I and the second member II. In the present invention, among the plurality of members, at least a part of the other member forming the joint surface adjacent to the one member is provided with a convex portion protruding from the joint surface, and at least a part of the convex portion is It bites into the inner side of one member joined to another member. In FIG. 4, the joint surface is indicated by a chain line X. As shown in FIGS. 4A to 4C, the second member II has a number of convex portions 21a, 21a, 21a,... On the side facing the first member I (FIG. 4A); , 21b, 21b,... (FIG. 4B); 21c, 21c, 21c,... (FIG. 4C) are formed so as to protrude from the joint surface X. As shown in FIG. 4 (a), these convex portions may have a part on the tip side protruding toward the inner side of the first member I, or as a whole as shown in FIG. 4 (b). You may protrude so that it may bite into the inside of 1 member I. In the above description, it is assumed that the second member II is provided with a convex portion, but the same effect can be obtained by providing the first member I with a convex portion and projecting to the inner side of the second member II. Can be obtained. Further, the joining surface referred to here is a surface where the first member I and the second member II are in contact with each other in a macro manner, and microscopically, as indicated by a chain line X in FIG. It is an imaginary surface that lies between the two members and partitions the two members. The convex portions do not necessarily have to be formed on the entire joining surface, and may be appropriately arranged within a range in which a shift between both members can be prevented.

本発明において凸部の形状は特に限定されるものではないが、例えば図4(a)及び(b)のように断面形状三角形であってもよいし、図4(c)のように断面形状四角形であってもよい。またこれらの形状以外の多角形や円形、楕円形等の形状もとり得る。これらの中で、接合する工程が、第一部材Iの穴2に、それより僅かに大きく形成された第2部材IIを押し込むことにより両部材を接合して燃料電池用セパレータを作製する加工である場合には、先端が尖っている形状が好ましい。   In the present invention, the shape of the convex portion is not particularly limited. For example, the convex shape may be a triangular shape as shown in FIGS. 4A and 4B, or the sectional shape as shown in FIG. It may be a rectangle. In addition to these shapes, shapes such as polygons, circles, ellipses, and the like can be used. Among these, the joining step is a process of manufacturing a fuel cell separator by joining both members by pushing the second member II formed slightly larger than the second member II into the hole 2 of the first member I. In some cases, a shape with a sharp tip is preferred.

また本発明において、凸部の大きさは特に限定されるものではなく、第1部材Iと第2部材IIとの間のずれを防止することができる程度の大きさであれば、目視できる大きさであってもよいし、電子顕微鏡レベルで確認できる大きさであってもよい。これらの中で、接合する工程が、上記した「押し込む工程」である場合に、押し込み加工を容易なものとするという観点からは、接合面内で両部材のずれを防止するという本発明の効果を奏することができる範囲内で、所定の大きさ以下であることが好ましい。   In the present invention, the size of the convex portion is not particularly limited, and can be visually observed as long as it is a size that can prevent the displacement between the first member I and the second member II. It may be a size that can be confirmed at the electron microscope level. Among these, when the joining step is the above-described “pushing step”, from the viewpoint of facilitating the pushing process, the effect of the present invention that prevents the displacement of both members within the joining surface is achieved. It is preferable that it is below a predetermined size within the range in which

図5は、本発明の燃料電池用セパレータにおいて、第1部材Iに対して第2部材IIがとる形状のパターンを例示する平面図である。本発明において、第1部材Iに対する第2部材IIの平面視形状は特に限定されない。第2部材IIは、一つの第1部材Iに対して(a)〜(c)、(g)、(h)、及び(j)〜(l)に示すように、一部材であってもよいし、(d)〜(f)、及び(i)に示すように複数の部材であってもよい。また第2部材IIの形状は、(a)〜(g)、(i)、(k)、及び(l)に示すような矩形、(h)に示すような円形や楕円形、あるいは(j)に示すようなサーペンタイン形状であってもよい。また、的確なシール性を確保するという観点からは、第2部材IIは、その周囲を第1部材Iにより囲まれていることが好ましい。したがって、(b)、(e)、(f)、(k)、及び(l)よりも、(a)、(c)、(d)、及び(g)〜(j)に示されているパターンで第1部材I及び第2部材IIが形成された燃料電池用セパレータが好ましい。   FIG. 5 is a plan view illustrating a pattern having a shape taken by the second member II with respect to the first member I in the fuel cell separator of the present invention. In the present invention, the planar view shape of the second member II relative to the first member I is not particularly limited. The second member II may be a single member as shown in (a) to (c), (g), (h), and (j) to (l) with respect to one first member I. It may be a plurality of members as shown in (d) to (f) and (i). The shape of the second member II is a rectangle as shown in (a) to (g), (i), (k), and (l), a circle or an ellipse as shown in (h), or (j Serpentine shape as shown in FIG. Moreover, it is preferable that the periphery of the 2nd member II is surrounded by the 1st member I from a viewpoint of ensuring exact sealing performance. Therefore, it is shown in (a), (c), (d), and (g)-(j) rather than (b), (e), (f), (k), and (l). A fuel cell separator in which the first member I and the second member II are formed in a pattern is preferable.

図6は、第1部材I内の第2部材IIを、ユニットセルの面方向に直交する面により切断した場合の断面を示す図である。図6において紙面左右方向がユニットセルの面方向である。本発明において、図に示す断面での第1部材Iに対して第2部材IIがとる形状は特に限定されるものではなく、例えば(a)に示すように両部材の接合面Xがユニットセルの面方向に直交する方向に、第1部材Iの両面を貫通していてもよい。また(b)に示すように、両部材の接合面Yが第1部材Iの厚さ方向の途中までであってもよい。さらに(c)に示すように、両部材の接合面Zがユニットセルの面方向に直交する方向に対し角度を持っていてもよく、また(d)に示すように第1部材Iの厚さ方向に第2部材IIの図の水平方向の断面が次第に縮小するような形状でもよい。これらの中で、第1部材Iを切削等により形成する加工工程の容易性、両部材を接合する工程の容易性、及び両部材間のずれ防止のしやすさ等の観点からは(a)に示す第1部材I、及び第2部材IIの形状が好ましい。   FIG. 6 is a view showing a cross section when the second member II in the first member I is cut by a plane orthogonal to the plane direction of the unit cell. In FIG. 6, the horizontal direction on the paper is the surface direction of the unit cell. In the present invention, the shape taken by the second member II with respect to the first member I in the cross section shown in the figure is not particularly limited. For example, as shown in FIG. The first member I may penetrate both sides in a direction perpendicular to the surface direction. Moreover, as shown to (b), the joining surface Y of both members may be to the middle of the thickness direction of the 1st member I. Furthermore, as shown in (c), the joint surface Z of both members may have an angle with respect to the direction orthogonal to the surface direction of the unit cell, and the thickness of the first member I as shown in (d). The shape may be such that the horizontal section of the second member II is gradually reduced in the direction. Among these, from the viewpoint of the ease of the processing step for forming the first member I by cutting or the like, the ease of the step of joining the two members, and the ease of preventing displacement between the two members (a) The shapes of the first member I and the second member II shown in FIG.

本発明において、第1部材Iに対する第2部材IIの接合方法は特に限定されるものではないが、加工が容易であるという観点からは、第1部材Iの穴2(図3参照)の内周壁形状よりわずかに第2部材IIの外周壁形状を大きく形成し、当該第2部材IIを第1部材Iの穴2に押し込む接合工程をとることが好ましい。この場合に凸部が形成されている部材(本実施形態では第2部材II)の硬さは、接合される相手方の部材(本実施形態においては第1部材I)の硬さより大であることが好ましい。両部材間の硬さの差は、上記押し込み加工の際に両部材間に凝着が生じない範囲で適宜選択する。また、加工の容易性と、加工後の両部材間のずれを確実に防止するという観点から、凸部の大きさは、押し込み加工が可能な範囲で大きなものが好ましい。さらに凸部の加工が不要であるという観点から、第2部材IIを形成する材料として、多孔質材料を使用することも好ましい。多孔質材料を使用することにより、セパレータ両面間に流体(気体、液体)を流通させることができるという利点もある。かかる多孔質材料として、ポーラスに形成されたカーボン、あるいはメッキ法、発泡法等により製造される発泡金属、あるいは焼結金属などを使用することができる。   In the present invention, the method of joining the second member II to the first member I is not particularly limited, but from the viewpoint of easy processing, the inside of the hole 2 (see FIG. 3) of the first member I. It is preferable to take a joining step in which the outer peripheral wall shape of the second member II is slightly larger than the peripheral wall shape and the second member II is pushed into the hole 2 of the first member I. In this case, the hardness of the member on which the convex portion is formed (second member II in the present embodiment) is greater than the hardness of the mating member (first member I in the present embodiment) to be joined. Is preferred. The difference in hardness between the two members is appropriately selected within a range where no adhesion occurs between the two members during the indentation process. Further, from the viewpoint of ease of processing and reliably preventing displacement between both members after processing, the size of the convex portion is preferably large as long as it can be pressed. Furthermore, it is also preferable to use a porous material as a material for forming the second member II from the viewpoint that processing of the convex portion is unnecessary. By using a porous material, there is also an advantage that fluid (gas, liquid) can be circulated between both surfaces of the separator. As such a porous material, carbon formed into a porous material, a foamed metal manufactured by a plating method, a foaming method, or the like, or a sintered metal can be used.

本発明における第1部材Iに対する第2部材IIの接合方法として、上記押し込み加工する方法のほかに、第2部材IIを中子として、第1部材Iを鋳造、または射出成型する方法、または、第2部材IIを所定の処理(例えば加熱、電離放射線の照射等)によりわずかに膨張する材料にて形成し、第1部材Iの穴2の内部に配置後、前記所定の処理を施す方法等が挙げられる。   As a method of joining the second member II to the first member I in the present invention, in addition to the above-described method of indenting, a method of casting or injection molding the first member I using the second member II as a core, or A method in which the second member II is formed of a material that expands slightly by predetermined processing (for example, heating, irradiation of ionizing radiation, etc.), and is disposed in the hole 2 of the first member I, and then the predetermined processing is performed. Is mentioned.

本実施形態において、第1部材Iを構成する材料は、第1部材Iの割れやクラックを防止するとともに、第2部材IIの多孔質材料の凸部を容易に喰い込ませるという観点から、金属や導電性樹脂であることが好ましい。また本発明で、複数の部材により形成される複数の接合面のうち、全ての接合面に凸部が形成されている必要はなく、たとえば、二つの接合面があるうちの一つの接合面のみに凸部が形成されていても良い。   In the present embodiment, the material constituting the first member I is a metal from the viewpoint of preventing cracks and cracks of the first member I and easily biting the convex portions of the porous material of the second member II. Or a conductive resin. Further, in the present invention, it is not necessary that convex portions are formed on all the bonding surfaces among the plurality of bonding surfaces formed by a plurality of members, for example, only one of the two bonding surfaces. Convex portions may be formed on the surface.

本発明の実施例としての燃料電池用セパレータを示す断面図である。It is sectional drawing which shows the separator for fuel cells as an Example of this invention. 燃料電池用セパレータをカソード側に配置して構成された燃料電池のユニットセルを示す図である。It is a figure which shows the unit cell of the fuel cell comprised by arrange | positioning the separator for fuel cells on the cathode side. 本発明の燃料電池用セパレータの一実施形態を概略的に示す斜視図である。1 is a perspective view schematically showing an embodiment of a fuel cell separator of the present invention. 第1部材と第2部材との接合面の断面を概念的に示す拡大図である。It is an enlarged view which shows notionally the cross section of the joint surface of a 1st member and a 2nd member. 第1部材に対して第2部材がとる形状のパターンを例示する平面図である。It is a top view which illustrates the pattern of the shape which the 2nd member takes with respect to the 1st member. 第1部材内の第2部材を、ユニットセルの面方向に直交する面により切断した場合の断面を示す図である。It is a figure which shows the cross section at the time of cut | disconnecting the 2nd member in a 1st member by the surface orthogonal to the surface direction of a unit cell.

符号の説明Explanation of symbols

I 第1部材
II 第2部材
X、Y、Z 接合面
2 穴
4 ガスケット用溝
5 冷却水用溝
6 冷却空気用溝
7a、7b 接合面
10 燃料電池用セパレータ
21a、21b、21c 凸部
50 貫通孔
100、200 燃料電池用セパレータ
110 カソード
150 MEA
210 アノード
500 ユニットセル
I 1st member
II Second member X, Y, Z Joint surface 2 hole 4 Gasket groove 5 Cooling water groove 6 Cooling air groove 7a, 7b Joint surface 10 Fuel cell separator 21a, 21b, 21c Convex portion 50 Through hole 100, 200 Fuel cell separator 110 Cathode 150 MEA
210 Anode 500 Unit cell

Claims (6)

ユニットセルの面方向に複数の部材が積層されて接合され、前記複数の部材のうちの一の部材と他の部材とが隣接して接合面を形成するとともに、少なくとも一つの接合面において、前記他の部材には少なくとも一部に前記接合面から突出する凸部が備えられ、前記凸部の少なくとも一部は、前記一の部材の内部側に喰い込んでいることを特徴とする、燃料電池用セパレータ。 A plurality of members are stacked and bonded in the surface direction of the unit cell, and one member of the plurality of members and another member are adjacent to form a bonding surface, and at least one bonding surface, The other member is provided with a convex portion projecting from the joint surface at least in part, and at least a part of the convex portion bites into the inner side of the one member. Separator for use. 前記凸部を備える他の部材の硬さは、前記一の部材の硬さより大であることを特徴とする、請求項1に記載の燃料電池用セパレータ。 2. The fuel cell separator according to claim 1, wherein the hardness of the other member including the convex portion is larger than the hardness of the one member. 前記複数の部材は、前記ユニットセルの面方向に直交する方向に形成された穴を有する第1部材と、前記穴の内周壁と略同一形状の外周壁を備えた第2部材とを含み、前記第1部材の穴に前記第2部材が配設され、前記内周壁と前記外周壁とが当接されて前記接合面を形成していることを特徴とする、請求項1または2に記載の燃料電池用セパレータ。 The plurality of members include a first member having a hole formed in a direction orthogonal to the surface direction of the unit cell, and a second member having an outer peripheral wall having substantially the same shape as the inner peripheral wall of the hole, The said 2nd member is arrange | positioned by the hole of the said 1st member, The said inner peripheral wall and the said outer peripheral wall are contact | abutted, and the said joint surface is formed, It is characterized by the above-mentioned. Fuel cell separator. 前記第2部材は、前記第1部材を構成する材料より大きな硬さを有する多孔質材料により形成されていることを特徴とする、請求項3に記載の燃料電池用セパレータ。 4. The fuel cell separator according to claim 3, wherein the second member is made of a porous material having hardness greater than that of the material constituting the first member. 5. ユニットセルの面方向に直交する方向に貫通孔を形成した第1部材と、前記第1部材より大きな硬さを有する多孔質物質にて前記貫通孔の形状に形成した第2部材とを具備し、前記第1部材の貫通孔に前記第2部材を押し込んで接合した燃料電池用セパレータであって、前記第1部材と前記第2部材とがなす接合面では、前記第2部材が有する凸部が、前記第1部材内部側に喰い込んでいる燃料電池用セパレータ。 A first member having a through-hole formed in a direction perpendicular to the surface direction of the unit cell; and a second member formed in the shape of the through-hole by a porous material having hardness greater than that of the first member. A separator for a fuel cell in which the second member is pushed into and joined to the through hole of the first member, and a convex portion of the second member on a joint surface formed by the first member and the second member However, the separator for fuel cells which has bitten into the 1st member inside side. 燃料電池用セパレータの製造方法であって、
ユニットセルの面方向に直交する方向に貫通孔を有する第1部材を形成する第1工程と、
前記第1部材よりも大きな硬さを有する材料により、前記貫通孔の内周壁と略同一形状を有するとともに少なくとも一部に凸部を有する外周壁、を備える第2部材を形成する第2工程と、
前記第2部材を前記第1部材の貫通孔に押し込む第3工程と、を含み、
前記第3工程により、前記第2部材外周壁凸部の少なくとも一部が、前記第1部材の貫通孔内周壁内に喰い込むように、前記第1及び2工程において前記第1及び2部材を形成することを特徴とする、燃料電池用セパレータの製造方法。

A method for producing a separator for a fuel cell, comprising:
A first step of forming a first member having a through hole in a direction orthogonal to the surface direction of the unit cell;
A second step of forming a second member having a substantially same shape as the inner peripheral wall of the through-hole and having an outer peripheral wall having a convex part at least in part by a material having a hardness greater than that of the first member; ,
A third step of pushing the second member into the through hole of the first member,
In the first and second steps, the first and second members are moved so that at least a part of the second member outer peripheral wall convex portion bites into the through hole inner peripheral wall of the first member by the third step. A method for producing a fuel cell separator, characterized by comprising:

JP2004004728A 2004-01-09 2004-01-09 Separator for fuel cell and its manufacturing method Pending JP2005197187A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012246518A (en) * 2011-05-26 2012-12-13 Nissan Motor Co Ltd Conductive uneven layer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012246518A (en) * 2011-05-26 2012-12-13 Nissan Motor Co Ltd Conductive uneven layer

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