JP4826702B2 - Fuel cell component and method for manufacturing the same - Google Patents

Fuel cell component and method for manufacturing the same Download PDF

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JP4826702B2
JP4826702B2 JP2004281266A JP2004281266A JP4826702B2 JP 4826702 B2 JP4826702 B2 JP 4826702B2 JP 2004281266 A JP2004281266 A JP 2004281266A JP 2004281266 A JP2004281266 A JP 2004281266A JP 4826702 B2 JP4826702 B2 JP 4826702B2
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gasket
polymer film
gas diffusion
diffusion layer
rubber
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JP2006099982A (en
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慶宏 蔵野
博樹 牟礼
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Nok Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/023—Porous and characterised by the material
    • H01M8/0241—Composites
    • H01M8/0245—Composites in the form of layered or coated products
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0276—Sealing means characterised by their form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/028—Sealing means characterised by their material
    • H01M8/0284—Organic resins; Organic polymers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0286—Processes for forming seals
    • 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

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  • Composite Materials (AREA)
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Description

本発明は、燃料電池の構成要素をなす燃料電池用構成部品に係り、更に詳しくは、高分子膜とその両面に配置されるガス拡散層等のシール対象物とを有する燃料電池用構成部品に関するものである。   The present invention relates to a fuel cell component constituting a fuel cell component, and more particularly, to a fuel cell component having a polymer membrane and a sealing object such as a gas diffusion layer disposed on both surfaces thereof. Is.

本願出願人らは先に、高分子膜を挟んで接着した空隙部を有するシール対象物の空隙部分に液状ゴムシール材料を射出成形して含浸せしめ、シール材料を一体成形させた積層型燃料電池の構成部品を提案したが（特許文献１参照）、この先の技術によると、成形時の熱により空隙を有するシール対象物と高分子膜との接着剤の接着力が低下し、離型時にかかる応力でシール対象物と高分子膜との間に微小隙間が生じて、気体漏れが発生する問題点があることが判明した。   The applicants of the present application have previously described a laminated fuel cell in which a liquid rubber seal material is injected and impregnated into a void portion of a sealing object having a void portion bonded with a polymer film interposed therebetween, and the seal material is integrally molded. Although a component has been proposed (see Patent Document 1), according to the previous technology, the adhesive force of the adhesive between the sealing object having a void and the polymer film decreases due to heat at the time of molding, and the stress applied at the time of mold release Thus, it was found that there is a problem that a gas gap occurs due to a minute gap between the sealing object and the polymer film.

ＰＣＴ国際公開ＷＯ０２／０８９２４０Ａ１公報PCT International Publication WO02 / 089240A1

本発明は以上の点に鑑みて、先の技術に改良を加え、シール対象物と高分子膜との接着力を強化することができ、離型時の応力による隙間が形成されず、もって気体漏れを防止することができる燃料電池用構成部品を提供することを目的とする。   In view of the above points, the present invention improves the previous technique and can strengthen the adhesive force between the object to be sealed and the polymer film, so that no gap due to stress at the time of mold release is formed, and thus the gas It aims at providing the component for fuel cells which can prevent a leak.

上記目的を達成するため、本発明の請求項１による燃料電池用構成部品は、表面に樹脂層を有する高分子膜と、前記高分子膜に重ねられた多孔質体よりなるガス拡散層と、前記ガス拡散層におけるガスケット形成部位に含浸されて成形された液状ゴム硬化物と、前記ガスケット形成部位の表面上に接合または成形の手段により形成された所定のゴム材料よりなるガスケットとを備え、前記液状ゴム硬化物は、樹脂に対する加硫接着性を有する付加反応硬化型シリコーンゴムによって成形され、前記高分子膜に加硫接着されていることを特徴とするものである。 In order to achieve the above object, a fuel cell component according to claim 1 of the present invention includes a polymer film having a resin layer on the surface, a gas diffusion layer made of a porous material overlaid on the polymer film, A liquid rubber cured product impregnated and molded in a gasket formation site in the gas diffusion layer, and a gasket made of a predetermined rubber material formed on the surface of the gasket formation site by bonding or molding means, The liquid rubber cured product is formed of an addition reaction curable silicone rubber having vulcanization adhesiveness to a resin, and is vulcanized and bonded to the polymer film .

また、本発明の請求項２による燃料電池用構成部品の製造方法は、上記した請求項１記載の燃料電池用構成部品を製造する方法であって、表面に樹脂層を有する高分子膜に多孔質体よりなるガス拡散層を重ねる工程と、前記ガス拡散層におけるガスケット形成部位に液状ゴムを含浸させてこれを成形硬化させる工程と、前記液状ゴムの硬化後、前記ガスケット形成部位の表面上に所定のゴム材料よりなるガスケットを接合または成形の手段により形成する工程とを順次実施し、前記液状ゴムとして、樹脂に対する加硫接着性を有する付加反応硬化型シリコーンゴムを用いることによりこれを前記高分子膜に加硫接着することを特徴とするものである。 A method of manufacturing a fuel cell component according to claim 2 of the present invention is a method for producing a fuel cell component of claim 1, wherein the above porous to polymer film having a resin layer on the surface A step of stacking a gas diffusion layer made of a solid body, a step of impregnating a liquid rubber into a gasket formation site in the gas diffusion layer and molding and curing the rubber, and after curing of the liquid rubber, on the surface of the gasket formation site And sequentially forming a gasket made of a predetermined rubber material by means of joining or molding, and using the addition reaction curable silicone rubber having vulcanization adhesiveness to the resin as the liquid rubber. It is characterized by being vulcanized and bonded to a molecular film .

本発明は、以下の効果を奏する。   The present invention has the following effects.

すなわち、上記構成を備えた本願の請求項１または２に係る発明においては、樹脂に対する加硫接着性を有する付加反応硬化型シリコーンゴムを多孔質体よりなるガス拡散層に含浸させたうえで表面に樹脂層を有する高分子膜に加硫接着するようにしたために、ガス拡散層と高分子膜との接着力を強化することができる。したがって、離型時に応力が作用しても隙間が形成されにくくなることから、これをもって気体漏れを有効に防止することが可能となる。 That is, in the invention according to claim 1 or 2 of the present application having the above-described configuration , the surface is obtained by impregnating a gas diffusion layer made of a porous body with an addition reaction curable silicone rubber having vulcanization adhesion to a resin. Since the polymer film having the resin layer is vulcanized and adhered, the adhesive force between the gas diffusion layer and the polymer film can be enhanced. Therefore, even if stress acts at the time of mold release, it becomes difficult to form a gap, so that it is possible to effectively prevent gas leakage.

樹脂に対する加硫接着性を有する液状ゴムとしては、付加反応硬化型シリコーンゴムが好適に用いられる。付加反応硬化型シリコーンゴムは、（ａ）アルケニル基含有オルガノポリシロキサン１００重量部および（ｂ）Ｓｉ原子に直結したＨ原子を一分子中に少なくとも２個以上有するオルガノハイドロジエンポリシロキサンであって、前記（ａ）成分のアルケニル基に対しＨ原子（すなわちＳｉＨ基）が０．４〜５．０となる量で用いられた組成物からなり、実際には市販品、例えば信越化学製品Ｘ−３４−１２７７、Ｘ−３４−１５４７、Ｘ−３４−１４２７、Ｘ−３４−１４６４、Ｘ−３４−１５３５またはＸ−３４−１５３４等をそのまま使用することができる。 As the liquid rubber having vulcanization adhesiveness to the resin , an addition reaction curable silicone rubber is preferably used. The addition reaction curable silicone rubber is an organohydrodiene polysiloxane having (a) 100 parts by weight of an alkenyl group-containing organopolysiloxane and (b) at least two H atoms directly bonded to Si atoms in one molecule, It consists of a composition used in such an amount that the H atom (namely, SiH group) is 0.4 to 5.0 with respect to the alkenyl group of the component (a), and is actually a commercial product such as Shin-Etsu Chemical product X-34. -1277, X-34-1547, X-34-1427, X-34-1464, X-34-1535 or X-34-1534 can be used as they are.

また、本願の請求項１に係る発明は、これを燃料電池用構成部品の製造方法として捉えると、樹脂に対する加硫接着性を有する液状ゴム（付加反応硬化型シリコーンゴム）を、高分子膜を挟んで接着した空隙を有するシール対象物（ガス拡散層）に含浸させて成形することを特徴とするものとなる。 Further, when the invention according to claim 1 of the present application is regarded as a method for manufacturing a fuel cell component, a liquid rubber (addition reaction curable silicone rubber) having vulcanization adhesion to a resin is used as a polymer film. It is characterized in that it is impregnated and molded into a sealing object (gas diffusion layer) having a gap sandwiched and bonded .

つぎに本発明の実施例を図面にしたがって説明する。   Next, embodiments of the present invention will be described with reference to the drawings.

図１は、本発明の実施例に係る燃料電池用構成部品１の要部断面を示しており、同図（Ｂ）に示すように、この燃料電池用構成部品１は、高分子膜２、その両面に配置されたガス拡散層（ＧＤＬ）３，３、各ガス拡散層３におけるガスケット形成部位（ゴム含浸部）３ａに含浸されて成形された液状ゴム硬化物４、および各ガスケット形成部位３ａの表面上に配置されたガスケット５を有している。   FIG. 1 shows a cross section of a main part of a fuel cell component 1 according to an embodiment of the present invention. As shown in FIG. 1B, the fuel cell component 1 includes a polymer membrane 2, Gas diffusion layers (GDL) 3 and 3 disposed on both surfaces thereof, a liquid rubber cured product 4 formed by impregnating a gasket forming portion (rubber impregnated portion) 3a in each gas diffusion layer 3, and each gasket forming portion 3a It has the gasket 5 arrange | positioned on the surface.

すなわち、同図（Ａ）に示すように先ず、少なくとも表面に樹脂層を有する高分子膜２の両面にそれぞれ多孔質体よりなるガス拡散層３を重ね合わせて一体化し、次いで、各ガス拡散層３におけるガスケット形成部位３ａの気孔率を低下させて強度を増大させるべく同図（Ｂ）に示すように、ガスケット形成部位３ａに液状ゴムを含浸させてこれを成形硬化させるが、このとき本発明では、液状ゴムとして、樹脂と加硫接着するタイプを用いてこれを高分子膜２に加硫接着し、これによりガス拡散層３と高分子膜２との接着力を強化する。上記したように液状ゴムとしては、付加反応硬化型シリコーンゴムが好適に用いられる。ガス拡散層３は具体的には、カーボン繊維、金属繊維もしくは無機繊維等の繊維状物質の焼結体、織布または不織布等よりなる。液状ゴムの含浸および成形は金型にて行ない、液状ゴムが信越シリコーン製樹脂接着性液状シリコーンゴムである場合、その射出圧は３ＭＰａ程度、成形温度は１２０℃程度である。次いで、液状ゴムの硬化後、各ガスケット形成部位３ａの表面上に所定のゴム材料よりなるガスケット５を接合または成形等の手段により形成する。ガスケット５は、燃料電池セルにおいてセパレータ等と密接し、燃料流体等をシールするものである。   That is, as shown in FIG. 1A, first, gas diffusion layers 3 made of a porous material are superposed and integrated on both surfaces of a polymer film 2 having a resin layer on at least the surface, and then each gas diffusion layer is integrated. In order to reduce the porosity of the gasket forming portion 3a in FIG. 3 and increase the strength, the gasket forming portion 3a is impregnated with liquid rubber and molded and cured as shown in FIG. The liquid rubber is vulcanized and bonded to the polymer film 2 using a type that is vulcanized and bonded to the resin, thereby strengthening the adhesion between the gas diffusion layer 3 and the polymer film 2. As described above, addition reaction curable silicone rubber is preferably used as the liquid rubber. Specifically, the gas diffusion layer 3 is made of a sintered body of a fibrous substance such as carbon fiber, metal fiber or inorganic fiber, woven fabric or non-woven fabric. The impregnation and molding of the liquid rubber are performed with a mold. When the liquid rubber is a resin-adhesive liquid silicone rubber made of Shin-Etsu silicone, the injection pressure is about 3 MPa and the molding temperature is about 120 ° C. Next, after the liquid rubber is cured, a gasket 5 made of a predetermined rubber material is formed on the surface of each gasket forming portion 3a by means such as bonding or molding. The gasket 5 is in close contact with a separator or the like in the fuel battery cell and seals the fuel fluid or the like.

以上の構成によれば、ガス拡散層３に含浸される液状ゴムが高分子膜２に加硫接着されるために、ガス拡散層３と高分子膜２との接着力を強化することができる。したがって、離型時に応力が作用してもガス拡散層３と高分子膜２との間に隙間が形成されにくいことから、これをもって、懸念される気体漏れを有効に防止することができる。   According to the above configuration, since the liquid rubber impregnated in the gas diffusion layer 3 is vulcanized and bonded to the polymer film 2, the adhesive force between the gas diffusion layer 3 and the polymer film 2 can be enhanced. . Therefore, since a gap is not easily formed between the gas diffusion layer 3 and the polymer film 2 even when stress is applied at the time of mold release, it is possible to effectively prevent a gas leak that is a concern.

尚、図２（Ａ）および（Ｂ）に示すように、高分子膜２およびガス拡散層３よりなる一体品には、ガスケット形成部位３ａを厚さ方向に貫通する貫通孔（スルーホール部）６を予め形成しても良く、これによれば、一体品の両面が連通するため、両面のガスケット５，５を一体成形することが可能となる。   As shown in FIGS. 2A and 2B, the integrated product composed of the polymer film 2 and the gas diffusion layer 3 has a through-hole (through-hole portion) that penetrates the gasket forming portion 3a in the thickness direction. 6 may be formed in advance, and according to this, since both surfaces of the integrated product communicate with each other, the gaskets 5 and 5 on both surfaces can be integrally formed.

本発明の実施例に係る燃料電池用構成部品の要部断面図であって、（Ａ）はその製造過程を示す断面図、（Ｂ）は完成状態を示す断面図BRIEF DESCRIPTION OF THE DRAWINGS It is principal part sectional drawing of the component for fuel cells which concerns on the Example of this invention, Comprising: (A) is sectional drawing which shows the manufacturing process, (B) is sectional drawing which shows a completion state 本発明の他の実施例に係る燃料電池用構成部品の要部断面図であって、（Ａ）はその製造過程を示す断面図、（Ｂ）は完成状態を示す断面図It is principal part sectional drawing of the component for fuel cells which concerns on the other Example of this invention, Comprising: (A) is sectional drawing which shows the manufacture process, (B) is sectional drawing which shows a completion state

符号の説明Explanation of symbols

１ 燃料電池用構成部品
２ 高分子膜
３ ガス拡散層（シール対象物）
３ａ ガスケット形成部位
４ 液状ゴム硬化物
５ ガスケット
６ 貫通孔
1 Fuel cell component 2 Polymer membrane 3 Gas diffusion layer (sealing object)
3a Gasket forming part 4 Liquid rubber cured product 5 Gasket 6 Through hole

Claims (2)

表面に樹脂層を有する高分子膜（２）と、前記高分子膜（２）に重ねられた多孔質体よりなるガス拡散層（３）と、前記ガス拡散層（３）におけるガスケット形成部位（３ａ）に含浸されて成形された液状ゴム硬化物（４）と、前記ガスケット形成部位（３ａ）の表面上に接合または成形の手段により形成された所定のゴム材料よりなるガスケット（５）とを備え、
前記液状ゴム硬化物（４）は、樹脂に対する加硫接着性を有する付加反応硬化型シリコーンゴムによって成形され、前記高分子膜（２）に加硫接着されていることを特徴とする燃料電池用構成部品。 A polymer film (2) having a resin layer on the surface, a gas diffusion layer (3) made of a porous material overlaid on the polymer film (2), and a gasket-forming site in the gas diffusion layer (3) ( Liquid rubber cured product (4) impregnated and molded in 3a), and gasket (5) made of a predetermined rubber material formed by bonding or molding means on the surface of the gasket forming portion (3a) Prepared,
The liquid rubber cured product (4) is formed of an addition reaction curable silicone rubber having vulcanization adhesiveness to a resin, and is vulcanized and bonded to the polymer film (2) . Component part. 請求項１記載の燃料電池用構成部品を製造する方法であって、
表面に樹脂層を有する高分子膜（２）に多孔質体よりなるガス拡散層（３）を重ねる工程と、前記ガス拡散層（３）におけるガスケット形成部位（３ａ）に液状ゴムを含浸させてこれを成形硬化させる工程と、前記液状ゴムの硬化後、前記ガスケット形成部位（３ａ）の表面上に所定のゴム材料よりなるガスケット（５）を接合または成形の手段により形成する工程とを順次実施し、
前記液状ゴムとして、樹脂に対する加硫接着性を有する付加反応硬化型シリコーンゴムを用いることによりこれを前記高分子膜（２）に加硫接着することを特徴とする燃料電池用構成部品の製造方法。 A method of manufacturing a component for a fuel cell according to claim 1,
A step of superposing a gas diffusion layer (3) made of a porous material on a polymer film (2) having a resin layer on the surface, and impregnating a liquid rubber in a gasket formation site (3a) in the gas diffusion layer (3) A step of molding and curing this, and a step of forming a gasket (5) made of a predetermined rubber material on the surface of the gasket forming portion (3a) by means of bonding or molding after the liquid rubber is cured are sequentially performed. And
A method for producing a component for a fuel cell, characterized in that as the liquid rubber, an addition reaction curable silicone rubber having vulcanization adhesion to a resin is used and vulcanized and bonded to the polymer film (2). .
JP2004281266A 2004-09-28 2004-09-28 Fuel cell component and method for manufacturing the same Expired - Fee Related JP4826702B2 (en)

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JP2004281266A JP4826702B2 (en) 2004-09-28 2004-09-28 Fuel cell component and method for manufacturing the same
KR1020050088031A KR101211048B1 (en) 2004-09-28 2005-09-22 Constituent part for fuel cell

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JP2004281266A JP4826702B2 (en) 2004-09-28 2004-09-28 Fuel cell component and method for manufacturing the same

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JP2006099982A JP2006099982A (en) 2006-04-13
JP4826702B2 true JP4826702B2 (en) 2011-11-30

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