JP2005209351A - Forming method of rubber packing for fuel cell - Google Patents

Forming method of rubber packing for fuel cell Download PDF

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JP2005209351A
JP2005209351A JP2004011322A JP2004011322A JP2005209351A JP 2005209351 A JP2005209351 A JP 2005209351A JP 2004011322 A JP2004011322 A JP 2004011322A JP 2004011322 A JP2004011322 A JP 2004011322A JP 2005209351 A JP2005209351 A JP 2005209351A
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separator
rubber
rubber packing
groove
fuel cell
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JP2004011322A
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JP4656369B2 (en
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Haruto Takao
治人 高尾
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Tigers Polymer Corp
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Tigers Polymer Corp
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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

<P>PROBLEM TO BE SOLVED: To directly form a rubber packing in a recessed groove of a separator in one step by a screen printing method and realizing good sealing function of the formed rubber packing when the separator is assembled. <P>SOLUTION: Spacers 13, 13 are inserted into an inner peripheral part and an outer peripheral part in the recessed groove formed in the peripheral part of the separator 5 as a seal groove, and a rubber solution is filled in a space formed between the spacers 13, 14 of the recessed groove by the screen printing method to form an unvulcalized rubber coating layer, and the unvulcanized rubber coating layer is vulcanized to integrally bond to the separator 5. A screen printing plate in which the spacers 13, 14 are integrally projected from the back surface of a screen mask 11 is used. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、燃料電池例えば固体高分子型燃料電池のセパレータにゴムパッキンを一体に成形する方法に関し、特に、セパレータの周縁部にシール溝として凹溝が形成され、この凹溝にゴムパッキンを充填成形する方法に関する。   The present invention relates to a method of integrally forming a rubber packing on a separator of a fuel cell, for example, a polymer electrolyte fuel cell, and in particular, a concave groove is formed as a sealing groove on a peripheral edge of the separator, and the rubber packing is filled in the concave groove. The present invention relates to a molding method.

従来、セパレータの凹溝にシール材を設けたものとして、セパレータのシール部位に設けたシール溝に先端が幅狭でシール溝の深さよりも肉厚のゴムなどからなるシール材を設けることが特許文献１に記載されている。
特許第３４００４１５号公報 Conventionally, it is a patent that a seal material is provided in the concave groove of the separator, and a seal material made of rubber or the like having a narrower tip than the depth of the seal groove is provided in the seal groove provided in the seal portion of the separator. It is described in Document 1.
Japanese Patent No. 3400415

そして、前記シール材をセパレータに設ける方法としては、セパレータとは別個に成形したシール材を、組み付け時にセパレータ間に挟み込むか、シール材をセパレータに接着する方法、あるいは金型にセパレータをセットし、金型内のキャビティにシール材を射出して一体成形する方法が挙げられている。 And as a method of providing the sealing material on the separator, a sealing material molded separately from the separator is sandwiched between the separators during assembly, or the sealing material is bonded to the separator, or the separator is set in a mold, There is a method in which a sealing material is injected into a cavity in a mold and integrally molded.

一方、セパレータの凹溝にシール材を設ける別の方法として、特許文献２に示すようにスクリーン印刷法を利用するものが知られている。この方法は、前記凹溝に印刷材料を充填して平坦面となし、この平坦面にゴム溶液を塗布してゴムパッキンを形成するものである。
特開２００２―１９０３０７号公報 On the other hand, as another method of providing a sealing material in the groove of the separator, as shown in Patent Document 2, a method using a screen printing method is known. In this method, the groove is filled with a printing material to form a flat surface, and a rubber solution is applied to the flat surface to form a rubber packing.
JP 2002-190307 A

しかしながら、前記特許文献２では、セパレータの凹溝を平坦化する段階とゴム溶液を塗布してゴムパッキンを形成する段階の２段階を必要とし、面倒な作業を余儀なくされる問題があった。   However, in the above-mentioned Patent Document 2, there is a problem that two steps of flattening the groove of the separator and a step of forming a rubber packing by applying a rubber solution are required, which necessitates troublesome work.

本発明は、前記の問題に鑑み、セパレータの凹溝に直接ゴムパッキンの成形を１段階で可能とし、成形作業を容易にすることを目的とする。同時に、成形されたゴムパッキンが、セパレータの組み付け時に良好なシール機能を発揮できるようにすることを目的とする。 The present invention has been made in view of the above problems, and it is an object of the present invention to make it possible to form a rubber packing directly in a concave groove of a separator in one stage, thereby facilitating the molding operation. At the same time, an object is to allow the molded rubber packing to exhibit a good sealing function when the separator is assembled.

本発明は、上記の目的を達成するため、燃料電池の単電池と、この単電池を挟持するセパレータとの間に介在させるゴムパッキンの成形方法であって、前記セパレータの周縁部にシール溝として形成された凹溝内の内周縁部および外周縁部にそれぞれスペーサを挿入し、前記凹溝の前記スペーサ間に形成される空間にゴム溶液をスクリーン印刷法により充填して未加硫ゴムコーティング層を形成する工程、次いでこの未加硫ゴムコーティング層を加硫してセパレータに接着一体化する工程とを含む燃料電池用ゴムパッキンの成形方法を手段とするものである。また、上記成形方法において、スペーサがスクリーンマスクの裏面から一体に突設されたスクリーン印刷版を用いてゴム溶液を充填するようにしたものである。   In order to achieve the above object, the present invention provides a method for forming a rubber packing interposed between a fuel cell unit cell and a separator sandwiching the unit cell, wherein a sealing groove is formed on a peripheral portion of the separator. A spacer is inserted into each of the inner peripheral edge and the outer peripheral edge in the formed groove, and a rubber solution is filled in the space formed between the spacers in the groove by a screen printing method to form an unvulcanized rubber coating layer. And a step of vulcanizing the unvulcanized rubber coating layer and adhering and integrating the unvulcanized rubber coating layer with a separator. In the molding method, the rubber solution is filled using a screen printing plate in which spacers are integrally projected from the back surface of the screen mask.

本発明方法では、作業が簡易であるほか、成形されたゴムパッキンが凹溝内で内周方向および外周方向に変形できる余裕があり、小さな締め付け力で高いシール性能を発揮できる。   In the method of the present invention, the work is simple, and there is a margin that the molded rubber packing can be deformed in the inner circumferential direction and the outer circumferential direction in the concave groove, and high sealing performance can be exhibited with a small tightening force.

以下、図面を参照して本発明の実施の形態を説明する。図１は、本発明方法を適用して成形した固体高分子型燃料電池を構成する単セル１の概略縦断面図であり、通常燃料電池はこの単セル１を複数積層した積層体（図示せず）として構成されている。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view of a unit cell 1 constituting a polymer electrolyte fuel cell formed by applying the method of the present invention. A normal fuel cell is a laminate in which a plurality of unit cells 1 are stacked (not shown). Z).

図１において、単セル１は、高分子電解質膜２とこの高分子電解質膜２を挟んで両側に配設されるカソード電極３およびアノード電極４とからなる燃料電池本体と、カソード電極３およびアノード電極４にそれぞれ当接するように設けられたセパレータ５，５とにより構成されている。また、カソード電極側セパレータ５の電極３側には酸化ガス供給用の溝７が設けられ、アノード電極側セパレータ５の電極４側には燃料ガス供給用の溝８が設けられ、溝７は図示しない酸化ガス供給管に、溝８は図示しない燃料ガス供給管にそれぞれ連通している。上記単セル１には、高分子電解質膜２，カソード電極３およびアノード電極４からなる燃料電池本体の周囲に、燃料ガスおよび酸化ガスの漏洩を防止するとともに、カソード電極側セパレータ５とアノード電極側セパレータ５との間の絶縁を確保する額縁状のゴムパッキン９，９をセパレータ５，５との間に介在させている。 In FIG. 1, a single cell 1 includes a fuel cell body comprising a polymer electrolyte membrane 2 and a cathode electrode 3 and an anode electrode 4 disposed on both sides of the polymer electrolyte membrane 2, and a cathode electrode 3 and an anode. The separators 5 and 5 are provided so as to be in contact with the electrodes 4 respectively. A groove 7 for supplying an oxidizing gas is provided on the electrode 3 side of the cathode electrode side separator 5, and a groove 8 for supplying a fuel gas is provided on the electrode 4 side of the anode electrode side separator 5. The groove 8 communicates with a fuel gas supply pipe (not shown). The single cell 1 includes a fuel cell body made up of a polymer electrolyte membrane 2, a cathode electrode 3, and an anode electrode 4, and prevents leakage of fuel gas and oxidizing gas around the cathode electrode side separator 5 and anode electrode side. Frame-shaped rubber packings 9 and 9 for ensuring insulation between the separators 5 are interposed between the separators 5 and 5.

そして、本発明では、セパレータ５の周縁部にシール溝として凹溝６が刻設されており、この凹溝６にスクリーン印刷によりゴム溶液（例えば液状シリコーンゴムなど）が充填硬化されてゴムパッキン９が一体に成形されるが、額縁状に成形されるゴムパッキン９の内周側および外周側つまり凹溝６内の内周縁部及び外周縁部にはゴム溶液が充填されない空隙部１０，１０が形成されている。 In the present invention, a groove 6 is formed as a seal groove on the peripheral edge of the separator 5, and a rubber solution (for example, liquid silicone rubber) is filled and cured in the groove 6 by screen printing. Are formed integrally, but the inner and outer peripheral sides of the rubber packing 9 formed into a frame shape, that is, the inner peripheral edge and the outer peripheral edge in the concave groove 6 are provided with void portions 10 and 10 that are not filled with the rubber solution. Is formed.

図２〜図４はゴムパッキン９の成形工程を示すが、この成形工程においてスクリーンマスク１１を用いる。このスクリーンマスク１１は、スクリーンメッシュ層１２とその裏面（印刷面側）周縁に連続して一体に突設されたスペーサ１３（内周側）、スペーサ１４（外周側）とで構成されている。なお、１５はスクリーンメッシュ層１２に塗布した後に露光硬化させた感光乳液層である。また、スペーサ１３、１４は、セパレータ５の凹溝６内部の空隙部１０，１０に対応する部位に設けられるが、上記感光乳液層で形成してもよいが、これに限らずゴム、合成樹脂、金属などを一体に接合して形成してもよい。 2 to 4 show a molding process of the rubber packing 9, and a screen mask 11 is used in this molding process. The screen mask 11 is composed of a screen mesh layer 12 and spacers 13 (inner peripheral side) and spacers 14 (outer peripheral side) which are integrally projected continuously from the periphery of the back surface (printing surface side). Reference numeral 15 denotes a photosensitive emulsion layer that is applied to the screen mesh layer 12 and then cured by exposure. In addition, the spacers 13 and 14 are provided at portions corresponding to the voids 10 and 10 inside the concave groove 6 of the separator 5, but may be formed of the above-described photosensitive emulsion layer, but are not limited thereto, rubber, synthetic resin Alternatively, a metal or the like may be integrally bonded.

図３のように、凹溝６が形成されたセパレータ５の表面にスクリーンマスク１１を配置し、そのスペーサ１３、１４を凹溝６に挿入したうえで、図示しないスキージを用いてスクリーンマスク１１の感光乳液を塗布していない透孔１６を通じて液状ゴムなどのゴム溶液を凹溝６内のスペーサ１３、１４により区画された空間にのみに充填し、その後、スクリーンマスク１１を取り外し（図４）、充填したゴム溶液を室温或いは必要に応じて加熱して硬化させて、凹溝６内に加硫接着させたゴムパッキン９を形成している。なお、ゴムパッキンの加硫は電子線照射などの放射線架橋のほか、適宜の加硫方法を採用できる。 As shown in FIG. 3, the screen mask 11 is arranged on the surface of the separator 5 in which the concave groove 6 is formed, and the spacers 13 and 14 are inserted into the concave groove 6. A rubber solution such as liquid rubber is filled only in the space defined by the spacers 13 and 14 in the groove 6 through the through holes 16 not coated with the photosensitive emulsion, and then the screen mask 11 is removed (FIG. 4). The filled rubber solution is cured by heating at room temperature or as necessary to form a rubber packing 9 that is vulcanized and bonded in the groove 6. The rubber packing can be vulcanized by an appropriate vulcanization method in addition to radiation crosslinking such as electron beam irradiation.

図５は、ゴムパッキン９を成形した状態のセパレータを示す概略平面図で、凹溝６内の中央に額縁状にゴムパッキン９が加硫接着により一体化されるとともに、その内周縁及び外周縁には空隙部１０，１０が連続して形成され、ゴムパッキン９を圧縮した際に内外周方向に変形できる余地が確保されている。 FIG. 5 is a schematic plan view showing the separator in a state where the rubber packing 9 is formed. The rubber packing 9 is integrated in a frame shape in the center of the recessed groove 6 by vulcanization, and its inner and outer peripheral edges are integrated. The gaps 10 and 10 are continuously formed, and a room for deformation in the inner and outer peripheral directions when the rubber packing 9 is compressed is secured.

固体高分子型燃料電池を構成する単位セルの概略縦断面図。The schematic longitudinal cross-sectional view of the unit cell which comprises a polymer electrolyte fuel cell. セパレータの凹溝にゴムパッキンを成形する工程の一部を示す図。The figure which shows a part of process of shape | molding rubber packing in the ditch | groove of a separator. セパレータの凹溝にゴムパッキンを成形する工程の一部を示す図。The figure which shows a part of process of shape | molding rubber packing in the ditch | groove of a separator. セパレータの凹溝にゴムパッキンを成形する工程の一部を示す図。The figure which shows a part of process of shape | molding rubber packing in the ditch | groove of a separator. セパレータの凹溝にゴムパッキンが成形された状態を示す概略平面図。The schematic plan view which shows the state by which the rubber packing was shape | molded in the ditch | groove of the separator.

符号の説明Explanation of symbols

１ 単位セル
２ 高分子電解質膜
３ カソード電極
４ アノード電極
５，５ セパレータ
６ 凹溝
９ ゴムパッキン
１０，１０ 空隙部
１１ スクリーンマスク
１２ スクリーンメッシュ層
１３ 内周側スペーサ
１４ 外周側スペーサ
１５ 感光乳液層
１６ 透孔
1 Unit Cell 2 Polymer Electrolyte Membrane 3 Cathode Electrode 4 Anode Electrode 5, 5 Separator 6 Groove 9 Rubber Packing 10, 10 Gap 11 Screen Mask 12 Screen Mesh Layer 13 Inner Side Spacer 14 Outer Side Spacer 15 Photosensitive Emulsion Layer 16 Through hole

Claims (2)

燃料電池の単電池と、この単電池を挟持するセパレータとの間に介在させるゴムパッキンの成形方法であって、前記セパレータの周縁部にシール溝として形成された凹溝内の内周縁部および外周縁部にそれぞれスペーサを挿入し、前記凹溝の前記スペーサ間に形成される空間にゴム溶液をスクリーン印刷法により充填して未加硫ゴムコーティング層を形成する工程、次いでこの未加硫ゴムコーティング層を加硫してセパレータに接着一体化する工程とを含むことを特徴とする燃料電池用ゴムパッキンの成形方法。   A method for forming a rubber packing interposed between a unit cell of a fuel cell and a separator sandwiching the unit cell, wherein an inner peripheral portion and an outer portion in a concave groove formed as a seal groove on the peripheral portion of the separator A step of inserting a spacer in each peripheral portion and filling a space formed between the spacers of the concave groove with a rubber solution by a screen printing method to form an unvulcanized rubber coating layer; A method of molding a rubber packing for a fuel cell, comprising: vulcanizing the layer and bonding and integrating the layer with a separator. スペーサがスクリーンマスクの裏面から一体に突設されたスクリーン印刷版を用いてゴム溶液を充填するようにした請求項１に記載の燃料電池用ゴムパッキンの成形方法。 2. The method of molding a rubber packing for a fuel cell according to claim 1, wherein the rubber solution is filled using a screen printing plate in which the spacer is integrally projected from the back surface of the screen mask.
JP2004011322A 2004-01-20 2004-01-20 Method of molding rubber packing for fuel cell Expired - Fee Related JP4656369B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007115503A (en) * 2005-10-20 2007-05-10 Tigers Polymer Corp Sealing structure of fuel cell
JP2007278389A (en) * 2006-04-06 2007-10-25 Nok Corp Gasket forming method, and structure for forming gasket
US9132791B2 (en) 2012-10-19 2015-09-15 Toyota Motor Engineering & Manufacturing North America, Inc. Blind spot monitor assembly
JP2017526877A (en) * 2014-08-21 2017-09-14 ヘンケル・アクチェンゲゼルシャフト・ウント・コムパニー・コマンディットゲゼルシャフト・アウフ・アクチェンＨｅｎｋｅｌ ＡＧ ＆ Ｃｏ． ＫＧａＡ Method of manufacturing a gasket on a part and molding tool for use in such a method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101704231B1 (en) 2015-07-09 2017-02-07 현대자동차주식회사 Method for manufacturing separator with gasket

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Publication number Priority date Publication date Assignee Title
JP2001283893A (en) * 2000-03-31 2001-10-12 Toshiba Corp Solid polymer fuel cell stack
JP2001319666A (en) * 2000-05-02 2001-11-16 Honda Motor Co Ltd Fuel cell and its manufacturing method
JP2003123796A (en) * 2001-10-09 2003-04-25 Tigers Polymer Corp Seal structure for fuel cell and packing molding method
WO2004052614A1 (en) * 2002-12-12 2004-06-24 Kokoku Intech Co., Ltd. Method for manufacturing rubber combined with substrate in one piece
JP2004193108A (en) * 2002-11-27 2004-07-08 Honda Motor Co Ltd Fuel cell separator integrated seal and membrane electrode assembly with seal

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001283893A (en) * 2000-03-31 2001-10-12 Toshiba Corp Solid polymer fuel cell stack
JP2001319666A (en) * 2000-05-02 2001-11-16 Honda Motor Co Ltd Fuel cell and its manufacturing method
JP2003123796A (en) * 2001-10-09 2003-04-25 Tigers Polymer Corp Seal structure for fuel cell and packing molding method
JP2004193108A (en) * 2002-11-27 2004-07-08 Honda Motor Co Ltd Fuel cell separator integrated seal and membrane electrode assembly with seal
WO2004052614A1 (en) * 2002-12-12 2004-06-24 Kokoku Intech Co., Ltd. Method for manufacturing rubber combined with substrate in one piece

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007115503A (en) * 2005-10-20 2007-05-10 Tigers Polymer Corp Sealing structure of fuel cell
JP2007278389A (en) * 2006-04-06 2007-10-25 Nok Corp Gasket forming method, and structure for forming gasket
US9132791B2 (en) 2012-10-19 2015-09-15 Toyota Motor Engineering & Manufacturing North America, Inc. Blind spot monitor assembly
JP2017526877A (en) * 2014-08-21 2017-09-14 ヘンケル・アクチェンゲゼルシャフト・ウント・コムパニー・コマンディットゲゼルシャフト・アウフ・アクチェンＨｅｎｋｅｌ ＡＧ ＆ Ｃｏ． ＫＧａＡ Method of manufacturing a gasket on a part and molding tool for use in such a method

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