JP6886899B2 - Fuel cell structure - Google Patents

Fuel cell structure Download PDF

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JP6886899B2
JP6886899B2 JP2017164719A JP2017164719A JP6886899B2 JP 6886899 B2 JP6886899 B2 JP 6886899B2 JP 2017164719 A JP2017164719 A JP 2017164719A JP 2017164719 A JP2017164719 A JP 2017164719A JP 6886899 B2 JP6886899 B2 JP 6886899B2
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cell laminate
tightening
portions
fuel cell
pressing portion
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JP2019046540A (en
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田中　孝幸
孝幸 田中
全 前川
全 前川
洋 知沢
洋 知沢
将一 干鯛
将一 干鯛
洋二 中森
洋二 中森
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Toshiba Corp
Toshiba Energy Systems and Solutions 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

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Description

本発明の実施形態は、燃料電池構造体の構成に関する。
に関する。 Embodiments of the present invention relate to the configuration of a fuel cell structure.
Regarding.

燃料電池発電システムは、水素等の燃料と空気等の酸化剤を電気化学的に反応させることにより、燃料の持つ化学エネルギーを電気エネルギーに直接変換して外部へ取り出すシステムである。この燃料電池発電システムは一般に、比較的小型であり、高効率で、環境性に優れるという特徴を有する。また、発電に伴う発熱を温水や蒸気として回収することにより、コージェネレーションシステムとしての適用が可能である。 The fuel cell power generation system is a system in which a fuel such as hydrogen and an oxidizing agent such as air are electrochemically reacted to directly convert the chemical energy of the fuel into electric energy and take it out to the outside. This fuel cell power generation system is generally characterized by being relatively small, highly efficient, and environmentally friendly. In addition, it can be applied as a cogeneration system by recovering the heat generated by power generation as hot water or steam.

このような燃料電池システムの燃料電池本体は、電解質の違い等により様々なタイプのものに分類される。特に、電解質に固体高分子膜を用いた固体高分子形燃料電池は、低温動作性に優れ、高出力密度を有する。このため、一般家庭向けの小型コージェネレーションシステムや燃料電池自動車用の動力源としての用途に適しており、今後、市場規模が急激に拡大することが予想されている。 The fuel cell body of such a fuel cell system is classified into various types according to the difference in electrolytes and the like. In particular, a polymer electrolyte fuel cell using a polymer electrolyte membrane as an electrolyte is excellent in low temperature operability and has a high output density. Therefore, it is suitable for use as a power source for small cogeneration systems for general households and fuel cell vehicles, and the market scale is expected to expand rapidly in the future.

この固体高分子形燃料電池発電システムは、例えば、都市ガスやＬＰＧ等に代表される炭化水素系燃料から水素含有ガスを製造する改質装置、改質装置で製造された水素含有ガスと大気中の空気を燃料極および酸化剤極にそれぞれ供給して起電力を発生させる燃料電池スタック、燃料電池スタックで発生した電気エネルギーを外部負荷に供給する電気制御装置、および発電に伴う発熱を回収する熱利用系等を有している。また、燃料電池発電システムの性能を示す指標として、燃料の供給量に対する発電量として定義される発電効率が用いられる。つまり、この発電効率が高いほど、燃料の使用量を削減できる。このため、燃料電池スタックの発電効率を上げることが望まれている。 This solid polymer fuel cell power generation system includes, for example, a reformer that produces hydrogen-containing gas from hydrocarbon fuels such as city gas and LPG, hydrogen-containing gas produced by the reformer, and the atmosphere. A fuel cell stack that generates electromotive power by supplying the air to the fuel electrode and the oxidant electrode, respectively, an electric control device that supplies the electrical energy generated by the fuel cell stack to an external load, and heat that recovers the heat generated by power generation. It has a usage system, etc. Further, as an index showing the performance of the fuel cell power generation system, the power generation efficiency defined as the power generation amount with respect to the fuel supply amount is used. That is, the higher the power generation efficiency, the more the fuel consumption can be reduced. Therefore, it is desired to improve the power generation efficiency of the fuel cell stack.

燃料電池スタックは、例えば電解質膜を挟んで燃料極及び酸化剤極を配置して構成される電解質膜・電極接合体（ＭＥＡ：Ｍｅｍｂｒａｎｅ Ｅｌｅｃｔｒｏｄｅ Ａｓｓｅｍｂｌｙ）と、セパレータとで構成される燃料電池セルを複数積層したセル積層体を有する。セル積層体は、締付板により所定の面圧となるように締め付けられている。これにより、セル積層体の積層体間の接触抵抗が低減され、積層体のシール機能が維持される。また、セル積層体の発電効率を上げるためには、セル積層体の平面内の面圧を均一に保つ必要がある。さらに、燃料電池発電システムの小型化のために、締付板の薄型化、軽量化が要求されている。 The fuel cell stack includes, for example, a plurality of fuel cell cells composed of an electrolyte membrane / electrode assembly (MEA: Membrane Electrode Assembly) formed by arranging a fuel electrode and an oxidizing agent electrode across an electrolyte membrane, and a separator. It has a laminated cell laminate. The cell laminate is tightened by a tightening plate so as to have a predetermined surface pressure. As a result, the contact resistance between the laminated bodies of the cell laminated body is reduced, and the sealing function of the laminated body is maintained. Further, in order to increase the power generation efficiency of the cell laminate, it is necessary to keep the surface pressure in the plane of the cell laminate uniform. Further, in order to reduce the size of the fuel cell power generation system, it is required to reduce the thickness and weight of the tightening plate.

特開２０１２−２５６５４０号公報Japanese Unexamined Patent Publication No. 2012-256540

しかしながら、締付板の薄型化、軽量化を進めると、締付板を連結具に締結する際にたわみが生じ、セル積層体の面圧が不均一化してしまう恐れがある。 However, if the tightening plate is made thinner and lighter, bending may occur when the tightening plate is fastened to the connector, and the surface pressure of the cell laminate may become non-uniform.

本発明が解決しようとする課題は、締付板を連結具に締結する際にたわみが生じても、セル積層体の面圧を均一化させることが可能な燃料電池構造体を提供することである。 The problem to be solved by the present invention is to provide a fuel cell structure capable of equalizing the surface pressure of the cell laminate even if bending occurs when the tightening plate is fastened to the connector. is there.

本実施形態によれば、燃料電池構造体は、複数の燃料電池セルが積層されたセル積層体と、
前記セル積層体の積層方向の両端面側から前記セル積層体を締め付ける２つの締付板と、を備え、前記２つの締付板のそれぞれは、前記セル積層体の積層方向の両端面に対向配置され、前記セル積層体を積層方向に押圧する押圧部と、前記押圧部の前記セル積層体に対向する面とは反対の面側に突き出して前記押圧部の面に沿って延在する凸状の梁部と、を有し、前記押圧部の前記セル積層体に対向する面側の中央部は、前記押圧部の前記セル積層体に対向する面側の縁部よりも、前記セル積層体側に突き出しており、前記押圧部と前記梁部とは、一体成形されている。 According to the present embodiment, the fuel cell structure includes a cell laminate in which a plurality of fuel cell cells are laminated, and a cell laminate.
Two tightening plates for tightening the cell laminate from both end faces in the stacking direction of the cell laminate are provided, and each of the two tightening plates faces both end faces in the stacking direction of the cell laminate. A convex portion that is arranged and presses the cell laminate in the stacking direction and a protrusion that protrudes toward the surface of the pressing portion opposite to the surface facing the cell laminate and extends along the surface of the pressing portion. The central portion of the pressing portion on the surface side facing the cell laminate, which has a shaped beam portion, is more cell-laminated than the edge portion of the pressing portion on the surface side facing the cell laminate. It protrudes toward the body, and the pressing portion and the beam portion are integrally molded.

本発明によれば、締付板を連結具に締結する際にたわみが生じても、セル積層体内の面圧の均一化ができる。 According to the present invention, even if bending occurs when the tightening plate is fastened to the connecting tool, the surface pressure inside the cell stack can be made uniform.

第１実施形態に係る燃料電池構造体の斜視図。The perspective view of the fuel cell structure which concerns on 1st Embodiment. マニホールドを装着した状態の燃料電池構造体を示す図。The figure which shows the fuel cell structure in the state which attached the manifold. 締付板の斜視図。Perspective view of the tightening plate. 比較例１の締付板を示す図。The figure which shows the tightening plate of the comparative example 1. FIG. 比較例２の締付板を示す図。The figure which shows the tightening plate of the comparative example 2. 評価した締付板の強度、形状変化についてまとめた図。The figure which summarized the strength and shape change of the evaluated tightening plate. 母材の厚さと締付板の強度、形状変化についてまとめた図。The figure which summarized the thickness of the base material, the strength of the tightening plate, and the shape change. 変形例に係る締付板の斜視図。The perspective view of the tightening plate which concerns on a modification. 第２実施形態に係る締付板の斜視図。The perspective view of the tightening plate which concerns on 2nd Embodiment. 締付板をＡ方向から見た側面図。A side view of the tightening plate as viewed from the A direction. 締付板をＢ方向から見た側面図。A side view of the tightening plate as viewed from the B direction. 図１２（ａ）は、図９の一部領域Ｃに対応する図３で示す締付板の部分を拡大した図、図１２（ｂ）は、図９の一部領域Ｃの拡大図。12 (a) is an enlarged view of the portion of the tightening plate shown in FIG. 3 corresponding to the partial area C of FIG. 9, and FIG. 12 (b) is an enlarged view of the partial area C of FIG. 第１実施形態に係る締付板と、第２実施形態に係る締付板の強度、形状変化についてまとめた図。The figure which summarized the strength and shape change of the tightening plate which concerns on 1st Embodiment and the tightening plate which concerns on 2nd Embodiment. 締付板と電流端子とを示す図。The figure which shows the tightening plate and the current terminal. 燃料電池構造体の断面図を模式的に示す図。The figure which shows typically the sectional view of the fuel cell structure. 第３施形態に係る締付板の側面図を示す図。The figure which shows the side view of the tightening plate which concerns on 3rd embodiment. 集電板と積層体の境界面における面圧を測定した領域を示す図。The figure which shows the region which measured the surface pressure at the boundary surface of a current collector plate and a laminated body. 段差距離と面圧の標準偏差との関係についてまとめた図。The figure which summarized the relationship between the step distance and the standard deviation of a surface pressure. セル積層体における面圧分布の標準偏差を示すグラフの図。The figure of the graph which shows the standard deviation of the surface pressure distribution in a cell laminated body. セル積層体の発電特性を示す図。The figure which shows the power generation characteristic of a cell laminated body. 第４実施形態に係る締付板の背面、すなわちセル積層体に対向する面側の構造を示す図。The figure which shows the structure of the back surface of the tightening plate which concerns on 4th Embodiment, that is, the surface side which faces the cell laminated body. 締付板を連結具に締結する工程順序を示す図。The figure which shows the process sequence of fastening a tightening plate to a connector.

以下、図面を参照して、本発明の実施形態について説明する。なお、本件明細書に添付する図面においては、図示と理解のしやすさの便宜上、適宜縮尺および縦横の寸法比等を、実物のそれらから変更し誇張してある。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, the scale, aspect ratio, etc. are appropriately changed from those of the actual product and exaggerated for the convenience of illustration and comprehension.

（第１実施形態）
図１は、第１実施形態に係る燃料電池構造体１の斜視図である。図１に示すように、燃料電池構造体１は、燃料電池セルにおける電気化学反応により発電する構造体である。すなわち、燃料電池構造体１は、セル積層体１０と、２つの集電板２０と、２つの絶縁板２５と、燃料電池締付構造体３０とを備えて構成されている。セル積層体１０は、複数の燃料電池セルを積層したものである。燃料電池セルは、水素を含む燃料ガスと酸素を含む空気との電気化学反応により発電する。すなわち、燃料電池セルは、例えば、電解質膜を挟んで燃料極及び酸化剤極を配置して構成される電解質膜・電極接合体と、電解質膜・電極接合体にガス供給を行うと共に燃料と酸化剤を分離する機能を有するセパレータとを有する。セパレータは、例えば微細孔を有する導電性多孔質板で構成されている。また、セパレータは、冷却水流路を有する。冷却水流路は、供給された冷却水をその表面から蒸発し、燃料電池セルを加湿する。なお、冷却水路を有しないセパレータを用いてもよい。 (First Embodiment)
FIG. 1 is a perspective view of the fuel cell structure 1 according to the first embodiment. As shown in FIG. 1, the fuel cell structure 1 is a structure that generates electricity by an electrochemical reaction in a fuel cell. That is, the fuel cell structure 1 includes a cell laminate 10, two current collector plates 20, two insulating plates 25, and a fuel cell tightening structure 30. The cell laminate 10 is a stack of a plurality of fuel cell cells. Fuel cell cells generate electricity through an electrochemical reaction between a fuel gas containing hydrogen and air containing oxygen. That is, in the fuel cell, for example, gas is supplied to the electrolyte membrane / electrode assembly formed by arranging the fuel electrode and the oxidant electrode with the electrolyte membrane interposed therebetween, and the fuel and the oxidizer are oxidized. It has a separator having a function of separating the agent. The separator is made of, for example, a conductive porous plate having fine pores. Further, the separator has a cooling water flow path. The cooling water flow path evaporates the supplied cooling water from its surface to humidify the fuel cell. A separator having no cooling water channel may be used.

セル積層体１０の積層方向の両側には、２つの集電板２０が配置されている。２つの集電板２０は、板状の導電体であり、セル積層体１０の両端面のそれぞれに配置されている。２つの絶縁板２５は、板状の絶縁体であり、２つの集電板２０と、２つの締付板１００との間にそれぞれ配置されている。このように、セル積層体１０の積層方向の両側には、２つの集電板２０と２つの絶縁板２５が順に配置されており、これらを一体的に積層方向の両側から２つの締付板１００で締め付けることで、燃料電池構造体１が得られる。 Two current collector plates 20 are arranged on both sides of the cell laminate 10 in the stacking direction. The two current collector plates 20 are plate-shaped conductors and are arranged on both end faces of the cell laminate 10. The two insulating plates 25 are plate-shaped insulators, and are arranged between the two current collecting plates 20 and the two tightening plates 100, respectively. In this way, two current collector plates 20 and two insulating plates 25 are sequentially arranged on both sides of the cell laminated body 10 in the stacking direction, and these are integrally arranged from both sides in the stacking direction. By tightening with 100, the fuel cell structure 1 can be obtained.

燃料電池締付構造体３０は、セル積層体１０に面圧を加える構造体であり、２つの締付板１００と、複数の連結具２００と、を備えて構成されている。２つの締付板１００は、複数の燃料電池セルが積層されたセル積層体１０の積層方向の両側からセル積層体１０を締め付ける部材である。締付板１００は、押圧部１１０と、梁部１２０とを有している。これら押圧部１１０と、梁部１２０とは一体形成されている。締付板１００の詳細な構造は、後述する。 The fuel cell tightening structure 30 is a structure that applies surface pressure to the cell laminate 10, and is configured to include two tightening plates 100 and a plurality of connecting tools 200. The two tightening plates 100 are members that tighten the cell laminate 10 from both sides in the stacking direction of the cell laminate 10 in which a plurality of fuel cell cells are laminated. The tightening plate 100 has a pressing portion 110 and a beam portion 120. The pressing portion 110 and the beam portion 120 are integrally formed. The detailed structure of the tightening plate 100 will be described later.

連結具２００は、２つの締付板１００を連結させる部材である。すなわち、本実施形態における連結具２００は、タイロッド２０２と、二つの座金２０４と、二つのナット２０６と、を有している。図１に示すように、２つの締付板１００に設けられた対向する孔部にタイロッド２０２を通した状態で、座金２０４を介してナット２０６が締め付けられ、２つの締付板１００が連結されている。 The connector 200 is a member that connects the two tightening plates 100. That is, the connector 200 in the present embodiment has a tie rod 202, two washers 204, and two nuts 206. As shown in FIG. 1, the nut 206 is tightened via the washer 204 with the tie rod 202 passed through the opposing holes provided in the two tightening plates 100, and the two tightening plates 100 are connected. ing.

図１の燃料電池構造体１におけるセル積層体１０の周囲にはマニホールドが装着される。マニホールドとは、燃料ガス、空気および冷却水の流路を備えた部材である。 A manifold is mounted around the cell laminate 10 in the fuel cell structure 1 of FIG. 1. A manifold is a member provided with flow paths for fuel gas, air, and cooling water.

図２は、マニホールドを装着した状態の燃料電池構造体１を示す図である。図２に示す燃料電池構造体１は、第１マニホールド４０と、第２マニホールド４２と、第３マニホールド４４と、第４マニホールド４６とを更に有する。 FIG. 2 is a diagram showing a fuel cell structure 1 with a manifold attached. The fuel cell structure 1 shown in FIG. 2 further includes a first manifold 40, a second manifold 42, a third manifold 44, and a fourth manifold 46.

第１マニホールド４０は、冷却水マニホールドと空気ガスマニホールドを有している。第２マニホールド４２は、燃料ガスマニホールドである。第３マニホールド４４は、冷却水マニホールドと空気ガスマニホールドを有している。第４マニホールド４６は、燃料ガスマニホールドである。冷却水入口４０Ａから導入された冷却水は、セパレータ側面から供給され、セパレータの流水路を介して冷却水出口４４Ａから排出される。一方で、空気ガス入口４０Ｂから空気ガスが導入され、セル積層体１０内の電気化学反応によって消費されなかった空気ガスが空気ガス出口４０Ｃから排出される。また、燃料ガス入口４６Ａから燃料ガスが導入され、セル積層体１０内の電気化学反応によって消費されなかった燃料ガスが燃料ガス出口４６Ａから排出される。 The first manifold 40 has a cooling water manifold and an air gas manifold. The second manifold 42 is a fuel gas manifold. The third manifold 44 has a cooling water manifold and an air gas manifold. The fourth manifold 46 is a fuel gas manifold. The cooling water introduced from the cooling water inlet 40A is supplied from the side surface of the separator and discharged from the cooling water outlet 44A through the flow channel of the separator. On the other hand, the air gas is introduced from the air gas inlet 40B, and the air gas not consumed by the electrochemical reaction in the cell laminate 10 is discharged from the air gas outlet 40C. Further, the fuel gas is introduced from the fuel gas inlet 46A, and the fuel gas not consumed by the electrochemical reaction in the cell laminate 10 is discharged from the fuel gas outlet 46A.

図１及び図２を参照にしつつ、図３に基づき締付板１００の形状を説明する。図３は、締付板１００の斜視図である。図１及び図２に示すように、押圧部１１０は、セル積層体１０に対向配置され、セル積層体１０を積層方向に押圧する。実際には、セル積層体１０の積層方向の両側には、集電板２０と絶縁体２５が配置されているため、押圧部１１０は、絶縁体２５と集電板２０を介して、セル積層体１０を両側から押圧することになる。図３に示すように、押圧部１１０は、部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄ、１１０Ｅと、押圧部１１０の面方向に交差する方向に折り曲げられた折り返し部１１２Ａ、１１２Ｂ、１１２Ｃ、１１２Ｄとを、有している。このうち、部分押圧部１１０Ｅは、押圧部１１０の中央側に配置され、その周囲に部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄが配置されている。折り返し部１１２Ａ、１１２Ｂ、１１２Ｃ、１１２Ｄはそれぞれ、部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄの縁側を折り曲げて形成されている。図２に示すように、折り返し部１１２Ａ、１１２Ｂ、１１２Ｃ、１１２Ｄにはそれぞれ、第４マニホールド４６と、第１マニホールド４０と、第２マニホールド４２と、第３マニホールド４４とが取り付けられる。 The shape of the tightening plate 100 will be described with reference to FIGS. 1 and 2. FIG. 3 is a perspective view of the tightening plate 100. As shown in FIGS. 1 and 2, the pressing portion 110 is arranged to face the cell laminated body 10 and presses the cell laminated body 10 in the stacking direction. Actually, since the current collector plate 20 and the insulator 25 are arranged on both sides of the cell laminate 10 in the stacking direction, the pressing portion 110 is the cell laminate via the insulator 25 and the current collector plate 20. The body 10 will be pressed from both sides. As shown in FIG. 3, the pressing portion 110 includes partial pressing portions 110A, 110B, 110C, 110D, 110E and folded portions 112A, 112B, 112C, 112D bent in a direction intersecting the surface direction of the pressing portion 110. have. Of these, the partial pressing portion 110E is arranged on the central side of the pressing portion 110, and the partial pressing portions 110A, 110B, 110C, and 110D are arranged around the partial pressing portion 110E. The folded portions 112A, 112B, 112C, and 112D are formed by bending the edge sides of the partial pressing portions 110A, 110B, 110C, and 110D, respectively. As shown in FIG. 2, a fourth manifold 46, a first manifold 40, a second manifold 42, and a third manifold 44 are attached to the folded portions 112A, 112B, 112C, and 112D, respectively.

図３に示すように、梁部１２０は、押圧部１１０からセル積層体１０とは反対側に突き出して押圧部１１０の面に沿って延在する凸状の梁である。梁部１２０は、複数の連結具２００を固定する複数の締結部１２２Ａ、１２２Ｂ、１２２Ｃ、１２２Ｄを有している。これら複数の締結部１２２Ａ、１２２Ｂ、１２２Ｃ、１２２Ｄは、梁部１２０の縁側に配置されている。これらから分かるように、２つの締付板１００は、複数の連結具２００を複数の締結部１２２Ａ、１２２Ｂ、１２２Ｃ、１２２Ｄに固定することで、セル積層体１０を積層方向に押圧する。 As shown in FIG. 3, the beam portion 120 is a convex beam that protrudes from the pressing portion 110 to the opposite side of the cell laminate 10 and extends along the surface of the pressing portion 110. The beam portion 120 has a plurality of fastening portions 122A, 122B, 122C, and 122D for fixing the plurality of connecting members 200. These plurality of fastening portions 122A, 122B, 122C, and 122D are arranged on the edge side of the beam portion 120. As can be seen from these, the two tightening plates 100 press the cell laminate 10 in the stacking direction by fixing the plurality of connecting members 200 to the plurality of fastening portions 122A, 122B, 122C, and 122D.

また、梁部１２０は、複数の締結部１２２Ａ、１２２Ｂ、１２２Ｃ、１２２Ｄのうち、隣接する２つの締結部同士を繋ぐ複数の凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄを有し、凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄの中央側の凸状サイズは、凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄの締結部１２２Ａ、１２２Ｂ、１２２Ｃ、１２２Ｄ側の凸状サイズよりも小さく形成されている。例えば、凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄの中央側の凸状高さは、凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄの締結部１２２Ａ、１２２Ｂ、１２２Ｃ、１２２Ｄ側の凸状高さよりも低く形成されている。 Further, the beam portion 120 has a plurality of convex portions 124A, 124B, 124C, 124D connecting two adjacent fastening portions among the plurality of fastening portions 122A, 122B, 122C, and 122D, and the convex portion 124A. , 124B, 124C, 124D, the convex size on the central side is formed smaller than the convex size on the fastening portion 122A, 122B, 122C, 122D side of the convex portions 124A, 124B, 124C, 124D. For example, the convex height on the central side of the convex portions 124A, 124B, 124C, 124D is lower than the convex height on the fastening portions 122A, 122B, 122C, 122D of the convex portions 124A, 124B, 124C, 124D. It is formed.

さらにまた、凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄの一端側の締結部から他端側の締結部まで、連続的に凸状高さが変化するように形成されている。このような形状にすることで、凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄの中央側の肉厚が薄くなるおそれがなくなる。仮に、凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄの凸状サイズが長手方向の全長にわたって同一であるとすると、これら４つの凸状部は長手方向の中央側でより接近しているため、中央側の肉厚サイズが締結部側の肉厚サイズよりも薄くなりやすい。肉厚サイズが薄くなると、亀裂が生じやすくなり、セル積層体１０を押圧する面内圧力も不均一になりやすい。これに対して、本実施形態のように、中央側の凸状高さを締結部側の凸状高さよりも低くすれば、中央側の肉厚サイズが薄くならなくなり、亀裂も生じにくくなって、セル積層１０を押圧する面内圧力も均一化できる。また、凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄの中央側の凸状高さを締結部側の凸状高さよりも低くすることにより、凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄの全体での板材料の使用量を削減でき、軽量化を図ることができる。 Furthermore, the convex heights are formed so as to continuously change from the fastening portion on one end side to the fastening portion on the other end side of the convex portions 124A, 124B, 124C, 124D. With such a shape, there is no possibility that the wall thickness on the central side of the convex portions 124A, 124B, 124C, and 124D becomes thin. Assuming that the convex sizes of the convex portions 124A, 124B, 124C, and 124D are the same over the entire length in the longitudinal direction, these four convex portions are closer to each other on the central side in the longitudinal direction, and thus are on the central side. The wall thickness size of is apt to be thinner than the wall thickness size on the fastening part side. When the wall thickness size is reduced, cracks are likely to occur, and the in-plane pressure for pressing the cell laminate 10 is also likely to be non-uniform. On the other hand, if the convex height on the central side is made lower than the convex height on the fastening portion side as in the present embodiment, the wall thickness size on the central side is not reduced and cracks are less likely to occur. , The in-plane pressure that presses the cell stack 10 can also be made uniform. Further, by making the convex height on the central side of the convex portions 124A, 124B, 124C, 124D lower than the convex height on the fastening portion side, the plate as a whole of the convex portions 124A, 124B, 124C, 124D. The amount of material used can be reduced and the weight can be reduced.

凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄは、押圧部１１０の中央部に配置される部分押圧部１１０Ｅの外側に配置されている。また、凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄは、押圧部１１０の面内で押圧部１１０の中心位置に対して点対称に配置されている。これにより、セル積層体１０の押圧力が面内で均一化される。また、梁部１２０は、複数の締結部１２２Ａ、１２２Ｂ、１２２Ｃ、１２２Ｄ付近に、押圧部１１０と面一の鍔部１２６Ａ、１２６Ｂ、１２６Ｃ、１２６Ｄを有している。鍔部１２６Ａ、１２６Ｂ、１２６Ｃ、１２６Ｄを設けることで、絶縁体２５との接触面積を増大できる。 The convex portions 124A, 124B, 124C, and 124D are arranged outside the partial pressing portion 110E arranged in the central portion of the pressing portion 110. Further, the convex portions 124A, 124B, 124C, and 124D are arranged point-symmetrically with respect to the center position of the pressing portion 110 in the plane of the pressing portion 110. As a result, the pressing force of the cell laminate 10 is made uniform in the plane. Further, the beam portion 120 has collar portions 126A, 126B, 126C, 126D flush with the pressing portion 110 in the vicinity of the plurality of fastening portions 122A, 122B, 122C, 122D. By providing the collar portions 126A, 126B, 126C, and 126D, the contact area with the insulator 25 can be increased.

本実施形態に係る締付板１００は、例えば、厚さ２．０ミリメータの高張力鋼（引っ張り強度４００ＭＰａ）を母材とし、金型を使用して複数回の加圧プレス工程を経て成形される。 The tightening plate 100 according to the present embodiment is formed, for example, using a high-strength steel (tensile strength 400 MPa) having a thickness of 2.0 mm as a base material and undergoing a plurality of pressure pressing steps using a die. To.

上述のように金型を使用して複数回の加圧プレス工程で締付板１００を製作し、締付板１００の強度と外観形状を評価した。図４は、評価の参考に用いた比較例１の締付板を示す図であり、表面側の締付板１００ａの斜視図と、裏面側の締付板１００ｂの斜視図とを示している。図４の締付板では、比較参照のため、凸形状の梁部１２０Ａの凸状高さを長手方向に沿って同一にしている。図５は、比較例２の締付板を示す図である。この締付板では、折り返し部が設けられていない。なお、図５における凸状部の構造は、図３に示す本実施形態の凸状部と同様である。また、特許文献１に記載の締付板と同様の構造の締付板を従来例として評価した。 As described above, the tightening plate 100 was manufactured by a plurality of pressure pressing steps using a mold, and the strength and appearance shape of the tightening plate 100 were evaluated. FIG. 4 is a diagram showing a tightening plate of Comparative Example 1 used as a reference for evaluation, and shows a perspective view of the tightening plate 100a on the front surface side and a perspective view of the tightening plate 100b on the back surface side. .. In the tightening plate of FIG. 4, the convex heights of the convex beam portions 120A are made the same along the longitudinal direction for comparison reference. FIG. 5 is a diagram showing a tightening plate of Comparative Example 2. This tightening plate is not provided with a folded portion. The structure of the convex portion in FIG. 5 is the same as that of the convex portion of the present embodiment shown in FIG. Further, a tightening plate having the same structure as the tightening plate described in Patent Document 1 was evaluated as a conventional example.

本実施形態に係る締付板１００の母材厚さを１．５〜３．５ミリメータの間で変更し、締付板１００の強度と外観形状を評価した。締付板１００の材料は高張力鋼（引っ張り強度４００ＭＰａ）とし、金型を使用して複数回の加圧プレス工程を経て成形した。 The thickness of the base material of the tightening plate 100 according to the present embodiment was changed between 1.5 and 3.5 mm, and the strength and appearance shape of the tightening plate 100 were evaluated. The material of the tightening plate 100 was high-strength steel (tensile strength 400 MPa), and it was formed through a plurality of pressure pressing steps using a die.

次に本実施の形態による作用、効果について説明する。まず、図３に示す凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄの凸状高さの効果について説明する。図６は、評価した締付板の強度、形状変化についてまとめた図である。図６に示すように、同一の母材を使用しても、比較例１の締付板（図４）のように凸形状の梁部の凸状高さを中心部と外周部で同一にすると、一部で亀裂が発生する。これは、加圧プレス工程における中央部での凸形状の梁部の形成時に、肉厚不足が発生するためと考えられている。 Next, the actions and effects of this embodiment will be described. First, the effect of the convex heights of the convex portions 124A, 124B, 124C, and 124D shown in FIG. 3 will be described. FIG. 6 is a diagram summarizing the strength and shape change of the evaluated tightening plate. As shown in FIG. 6, even if the same base material is used, the convex height of the convex beam portion is the same in the central portion and the outer peripheral portion as in the tightening plate (FIG. 4) of Comparative Example 1. Then, a crack occurs in a part. It is considered that this is because the wall thickness is insufficient when the convex beam portion is formed at the central portion in the pressure pressing process.

一方、図３に示す本実施形態に係る締付板１００（具体例１）は、梁部の凸状高さに勾配を持たせて、凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄの一端側の締結部から他端側の締結部まで、連続的に凸状高さを変化させ、中央部から外周部にかけて徐々に高くなるような形状を採用している。このような形状を採用することにより、中央部での肉厚サイズが薄くならなくなるため、凸形状の梁部に亀裂が生じなくなる。 On the other hand, in the tightening plate 100 (Specific Example 1) according to the present embodiment shown in FIG. 3, the convex height of the beam portion is provided with a gradient, and one end side of the convex portions 124A, 124B, 124C, 124D is provided. A shape is adopted in which the convex height is continuously changed from the fastening portion to the fastening portion on the other end side, and gradually increases from the central portion to the outer peripheral portion. By adopting such a shape, the wall thickness size at the central portion is not reduced, so that the convex beam portion is not cracked.

さらに、上述のように、凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄの中央側の凸状高さを低くすることで、梁部１２０を構成する板材料の使用量を削減でき、締付板１００を軽量化できる。 Further, as described above, by lowering the convex height on the central side of the convex portions 124A, 124B, 124C, and 124D, the amount of the plate material constituting the beam portion 120 can be reduced, and the tightening plate 100 can be used. Can be made lighter.

次に、本実施形態に係る締付板１００が有する折り返し部１１２Ａ、１１２Ｂ、１１２Ｃ、１１２Ｄ（折り返し構造）の作用、効果について説明する。折り返し部を有しない締付板である比較例２（図５）を連結具２００に所定の締付圧で締結したところ、押圧部と、梁部との境界に変形が生じた。 Next, the actions and effects of the folded-back portions 112A, 112B, 112C, 112D (folded-back structure) of the tightening plate 100 according to the present embodiment will be described. When Comparative Example 2 (FIG. 5), which is a tightening plate having no folded portion, was fastened to the connector 200 with a predetermined tightening pressure, the boundary between the pressing portion and the beam portion was deformed.

一方、図３に示す本実施の形態に係る締付板１００を比較例２（図５）と同等の締付圧で連結具２００に締結したところ、比較例２のような変形は生じなかった。これは、折り返し部１１２Ａ、１１２Ｂ、１１２Ｃ、１１２Ｄを設けることで、締付板１００の強度がより増加するためである。 On the other hand, when the tightening plate 100 according to the present embodiment shown in FIG. 3 was fastened to the connector 200 with the same tightening pressure as in Comparative Example 2 (FIG. 5), the deformation as in Comparative Example 2 did not occur. .. This is because the strength of the tightening plate 100 is further increased by providing the folded-back portions 112A, 112B, 112C, and 112D.

次に、本実施形態に係る締付板１００の母材の厚さに関する作用、効果について説明する。図７は、母材の厚さと締付板の強度、形状変化についてまとめた図である。図７に示すように、母材厚さを２．０ミリメータ未満となる１．５ミリメータ（比較例３）を使用した場合には、一体ブレス後に局所的に肉厚が過小となる箇所が散見され、シワが発生した。一方、厚さ３．０ミリメータを超える母材（比較例４）を使用した場合には、一体プレス工程で肉厚分布が不均一となり、一部箇所で亀裂が発生した。 Next, the action and effect regarding the thickness of the base material of the tightening plate 100 according to the present embodiment will be described. FIG. 7 is a diagram summarizing the thickness of the base material, the strength of the tightening plate, and the shape change. As shown in FIG. 7, when a 1.5 mm meter (Comparative Example 3) having a base metal thickness of less than 2.0 mm is used, there are some places where the wall thickness is locally undersized after the integral breathing. And wrinkles occurred. On the other hand, when a base material having a thickness of more than 3.0 mm (Comparative Example 4) was used, the wall thickness distribution became non-uniform in the integral pressing process, and cracks occurred in some parts.

一方で、具体例１から４に示すように、高張力鋼（引っ張り強度４００ＭＰａ）の母材厚さを２．０ミリメータ以上３．０ミリメータ以下にすると、締付板１００の外観形状にシワも亀裂も生じなかった。これにより、高張力鋼（引っ張り強度４００ＭＰａ）の母材厚さが２．０ミリメータ以上３．０ミリメータ以下の場合には、金型を使用した複数回の加圧プレス工程による締付板１００の製造に適していることがわかる。 On the other hand, as shown in Specific Examples 1 to 4, when the base material thickness of the high-strength steel (tensile strength 400 MPa) is 2.0 mm or more and 3.0 mm or less, the appearance shape of the tightening plate 100 is wrinkled. No cracks occurred. As a result, when the base metal thickness of high-strength steel (tensile strength 400 MPa) is 2.0 mm or more and 3.0 mm or less, the tightening plate 100 is subjected to a plurality of pressure pressing steps using a die. It turns out that it is suitable for manufacturing.

以上説明したように、本実施形態に係る燃料電池締付構造体３０によれば、締付板１００の梁部１２０の凸状高さに勾配を持たせて、凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄの一端側の締結部から他端側の締結部まで、連続的に凸状高さを変化させ、凸状高さが長手方向の中央部から締結部側にかけて徐々に高くなるような形状とした。これにより、押圧部１１０と梁部１２０とを一体成形する加圧プレス工程における肉厚不足が解消されるとともに軽量化が可能となる。 As described above, according to the fuel cell tightening structure 30 according to the present embodiment, the convex height of the beam portion 120 of the tightening plate 100 is provided with a gradient so that the convex portions 124A, 124B, 124C , 124D A shape in which the convex height is continuously changed from the fastening portion on one end side to the fastening portion on the other end side, and the convex height gradually increases from the central portion in the longitudinal direction to the fastening portion side. And said. As a result, the insufficient wall thickness in the pressure pressing process of integrally molding the pressing portion 110 and the beam portion 120 can be eliminated and the weight can be reduced.

また、凸状部１２４Ａ、１２４Ｂ、１２４Ｃ、１２４Ｄは、押圧部１１０の面内で押圧部１１０の中心位置に対して点対称に配置されている。これにより、セル積層体１０を押圧する面圧をより均一化することが可能である。 Further, the convex portions 124A, 124B, 124C, and 124D are arranged point-symmetrically with respect to the center position of the pressing portion 110 in the plane of the pressing portion 110. As a result, the surface pressure that presses the cell laminate 10 can be made more uniform.

さらにまた、締付板１００に折り返し部１１２Ａ、１１２Ｂ、１１２Ｃ、１１２Ｄを設けることにより、締付板１００の強度を向上できる。本実施形態では、押圧部１１０、梁部１２０および折り返し部１１２Ａ〜Ｄを有する締付板１００を一体成形するので、溶接加工を行わずとも締付板１００を製造可能であり、溶接加工よりも製造工数を低減できる。 Furthermore, the strength of the tightening plate 100 can be improved by providing the tightening plate 100 with folded portions 112A, 112B, 112C, 112D. In the present embodiment, since the tightening plate 100 having the pressing portion 110, the beam portion 120, and the folded-back portions 112A to D is integrally molded, the tightening plate 100 can be manufactured without welding, which is more than welding. Manufacturing man-hours can be reduced.

（変形例）
図８は、変形例に係る締付板の斜視図である。図８に示すように、変形例に係る締付板は、凸状体の凸状高さを一端側の締結部から他端側の締結部まで、連続的に変化させ、凸状高さが中央部から外周部にかけて徐々に高くなるような形状を有する。これにより、図３と同様に、押圧部１１０と梁部１２０とを一体成形する加圧プレス工程における肉厚不足が解消されるとともに軽量化が可能となる。また、梁部１２０の凸状を図３に示す凸状と同様の形状としてもよい。 (Modification example)
FIG. 8 is a perspective view of the tightening plate according to the modified example. As shown in FIG. 8, in the tightening plate according to the modified example, the convex height of the convex body is continuously changed from the fastening portion on one end side to the fastening portion on the other end side, and the convex height is increased. It has a shape that gradually increases from the central portion to the outer peripheral portion. As a result, similarly to FIG. 3, the shortage of the wall thickness in the pressure pressing process of integrally molding the pressing portion 110 and the beam portion 120 can be eliminated and the weight can be reduced. Further, the convex shape of the beam portion 120 may have the same shape as the convex shape shown in FIG.

（第２実施形態）
第１の実施形態による締付板１００にてセル積層体１０を締め付けた場合、梁部１２０と折り返し部１１２Ａ、１１２Ｂ、１１２Ｃ、１１２Ｄとの接合付近に応力が集中し、押圧部１１０の押圧力が高くなると、上述した接合付近（以下、応力集中部と呼ぶ）に亀裂が生じるおそれがある。第２の実施形態は、上述した応力集中部の応力を緩和するものである。 (Second Embodiment)
When the cell laminate 10 is tightened by the tightening plate 100 according to the first embodiment, stress is concentrated near the joint between the beam portion 120 and the folded portions 112A, 112B, 112C, 112D, and the pressing force of the pressing portion 110 If the value becomes high, cracks may occur in the vicinity of the above-mentioned joint (hereinafter referred to as a stress concentration portion). The second embodiment relieves the stress of the stress concentration portion described above.

第２実施形態に係る締付板１００は、鍔部と折り返し部とを面接合させる面接合部３００Ａ、３００Ｂ、３００Ｃ、３００Ｄ、３００Ｅ、３００Ｆ、３００Ｇ、３００Ｈを有することで、第１実施形態に係る締付板１００と相違する。以下に第１実施形態と相違する点を説明する。第１実施形態と同等の構成には、同一の番号を付して説明を省略する。 The tightening plate 100 according to the second embodiment has the surface joining portions 300A, 300B, 300C, 300D, 300E, 300F, 300G, 300H for face-joining the flange portion and the folded portion. It is different from the tightening plate 100. The differences from the first embodiment will be described below. The same number will be assigned to the configuration equivalent to that of the first embodiment, and the description thereof will be omitted.

図９は、第２実施形態に係る締付板１００の斜視図である。この図９に示すように、押圧部１１０は、鍔部１２６Ａ、１２６Ｂ、１２６Ｃ、１２６Ｄと折り返し部１１２Ａ、１１２Ｂ、１１２Ｃ、１１２Ｄとを面接合させる面接合部３００Ａ、３００Ｂ、３００Ｃ、３００Ｄ、３００Ｅ、３００Ｆ、３００Ｇ、３００Ｈを更に有している。 FIG. 9 is a perspective view of the tightening plate 100 according to the second embodiment. As shown in FIG. 9, the pressing portion 110 includes surface joining portions 300A, 300B, 300C, 300D, 300E, which face-join the flange portions 126A, 126B, 126C, 126D and the folded portions 112A, 112B, 112C, 112D. It also has 300F, 300G, and 300H.

図１０は、締付板１００をＡ方向から見た側面図である。図１１は、締付板１００をＢ方向から見た側面図である。図１０と図１１からわかるように、Ａ方向とＢ方向のいずれにおいても、締付板１００の側面図はほぼ同一である。図１２（ａ）は、図９の一部領域Ｃに対応する図３で示す締付板の部分を拡大した図であり、図１２（ｂ）は、図９の一部領域Ｃの拡大図である。 FIG. 10 is a side view of the tightening plate 100 as viewed from the A direction. FIG. 11 is a side view of the tightening plate 100 as viewed from the B direction. As can be seen from FIGS. 10 and 11, the side views of the tightening plate 100 are substantially the same in both the A direction and the B direction. 12 (a) is an enlarged view of the portion of the tightening plate shown in FIG. 3 corresponding to the partial region C of FIG. 9, and FIG. 12 (b) is an enlarged view of the partial region C of FIG. Is.

これら図９乃至図１２に示すように、鍔部１２６Ａ、１２６Ｂ、１２６Ｃ、１２６Ｄと折り返し部１１２Ａ、１１２Ｂ、１１２Ｃ、１１２Ｄとは、面接合されている。これにより、鍔部１２６Ａ、１２６Ｂ、１２６Ｃ、１２６Ｄと折り返し部１１２Ａ、１１２Ｂ、１１２Ｃ、１１２Ｄとの接合面積が第１の実施形態よりも広くなる。 As shown in FIGS. 9 to 12, the collar portions 126A, 126B, 126C, 126D and the folded portions 112A, 112B, 112C, 112D are surface-bonded. As a result, the joint area between the collar portions 126A, 126B, 126C, 126D and the folded portions 112A, 112B, 112C, 112D becomes wider than that in the first embodiment.

図１３は、第１実施形態に係る締付板１００と、第２実施形態に係る締付板１００の強度、形状変化についてまとめた図である。すなわち、図３で示す第１実施形態に係る締付板１００が具体例３に対応し、図９で示す第２実施形態に係る締付板１００が具体例５に対応する。ここで、強度に関しては、有限要素法による強度解析を行った。 FIG. 13 is a diagram summarizing the strength and shape change of the tightening plate 100 according to the first embodiment and the tightening plate 100 according to the second embodiment. That is, the tightening plate 100 according to the first embodiment shown in FIG. 3 corresponds to the specific example 3, and the tightening plate 100 according to the second embodiment shown in FIG. 9 corresponds to the specific example 5. Here, the strength was analyzed by the finite element method.

図１３に示すように、第１実施形態に係る締付板１００（具体例３）、及び第２実施形態に係る締付板１００（具体例５）のいずれも、表面形状に亀裂やシワ等の異常領域は発生しない。一方で、第１実施形態に係る締付板１００と、第２実施形態に係る締付板１００を比較すると、面接合部３００Ａ、３００Ｂ、３００Ｃ、３００Ｄ、３００Ｅ、３００Ｆ、３００Ｇ、３００Ｈを設けることで、応力集中部の相当応力が８９１ＭＰａから２８５ＭＰａまで６８％も低減する。このように、締付板１００に面接合部３００Ａ、３００Ｂ、３００Ｃ、３００Ｄ、３００Ｅ、３００Ｆ、３００Ｇ、３００Ｈを設けることで、締付板１００における応力集中部の応力を緩和でき、締付板１００の締付圧力をより高くすることができる。 As shown in FIG. 13, both the tightening plate 100 (Specific Example 3) according to the first embodiment and the tightening plate 100 (Specific Example 5) according to the second embodiment have cracks, wrinkles, etc. in the surface shape. Abnormal area does not occur. On the other hand, comparing the tightening plate 100 according to the first embodiment and the tightening plate 100 according to the second embodiment, the surface joint portions 300A, 300B, 300C, 300D, 300E, 300F, 300G, and 300H are provided. Therefore, the equivalent stress of the stress concentration portion is reduced by 68% from 891 MPa to 285 MPa. By providing the surface joining portions 300A, 300B, 300C, 300D, 300E, 300F, 300G, and 300H on the tightening plate 100 in this way, the stress of the stress concentration portion in the tightening plate 100 can be relaxed, and the tightening plate 100 can be relaxed. The tightening pressure can be increased.

以上説明したように、本実施形態に係る燃料電池締付構造体３０によれば、締付板１００の押圧部１１０と面一の鍔部１２６Ａ、１２６Ｂ、１２６Ｃ、１２６Ｄと、押圧部１１０の面方向に交差する方向に折り曲げられた折り返し部１１２Ａ、１１２Ｂ、１１２Ｃ、１１２Ｄとを面接合させる面接合部３００Ａ、３００Ｂ、３００Ｃ、３００Ｄ、３００Ｅ、３００Ｆ、３００Ｇ、３００Ｈを設けるため、これら面接合部の相当応力を低減させることができ、締付板１００の強度を向上できる。 As described above, according to the fuel cell tightening structure 30 according to the present embodiment, the flange portions 126A, 126B, 126C, 126D flush with the pressing portion 110 of the tightening plate 100, and the surfaces of the pressing portion 110. In order to provide the surface joint portions 300A, 300B, 300C, 300D, 300E, 300F, 300G, 300H for surface-joining the folded-back portions 112A, 112B, 112C, 112D bent in the directions intersecting the directions, the surface joint portions of these surface joint portions are provided. The equivalent stress can be reduced, and the strength of the tightening plate 100 can be improved.

（第３実施形態）
第３実施形態に係る締付板１００では、押圧部１１０のセル積層体１０に対向する面側の中央部１１０Ｅを、押圧部１１０のセル積層体１０に対向する面側の縁部よりも、セル積層体１０側に突き出させたものである。以下に第２実施形態と相違する点を説明する。第２実施形態と同等の構成には、同一の番号を付して説明を省略する。 (Third Embodiment)
In the tightening plate 100 according to the third embodiment, the central portion 110E of the pressing portion 110 on the surface side facing the cell laminate 10 is set closer to the edge portion of the pressing portion 110 on the surface side facing the cell laminate 10. It is projected toward the cell laminate 10 side. The differences from the second embodiment will be described below. The same number will be assigned to the configuration equivalent to that of the second embodiment, and the description thereof will be omitted.

図１４は、締付板１００と電流端子３５０とを示す図である。図１４に示すように中央部の部分押圧部１１０Ｅに、集電板２０に接続される電流端子３５０が設けられている。 FIG. 14 is a diagram showing a tightening plate 100 and a current terminal 350. As shown in FIG. 14, the partial pressing portion 110E in the central portion is provided with a current terminal 350 connected to the current collector plate 20.

図１５は、燃料電池構造体１の断面図を模式的に示す図である。この図１５に示すように、セル積層体１０は、複数の燃料電池セル１２を積層して構成されている。燃料電池構造体１は、セル積層体１０の両端に、集電板２０と、絶縁板２５と、締付板１００とを配置し、タイロッド２０２及び二つのナット２０６によって締め付けることにより構成されている。燃料電池セル１２は、固体高分子膜の両端に、触媒を塗布した燃料極及び酸化剤極を配し、その両端に燃料極流路と酸化剤極流路を備えた燃料極流路板と酸化剤極流路板によって構成されている。このような燃料電池構造体１では、燃料電池セルの１枚では起電力が１Ｖ程度と小さいため、燃料電池セル１２を一般に１０枚以上積層して、電気的に直列につなぎ高電圧出力を得ている。 FIG. 15 is a diagram schematically showing a cross-sectional view of the fuel cell structure 1. As shown in FIG. 15, the cell laminated body 10 is configured by laminating a plurality of fuel cell cells 12. The fuel cell structure 1 is configured by arranging a current collector plate 20, an insulating plate 25, and a tightening plate 100 at both ends of the cell laminate 10 and tightening them with a tie rod 202 and two nuts 206. .. The fuel cell 12 has a fuel electrode flow path plate in which a fuel electrode coated with a catalyst and an oxidant electrode are arranged at both ends of a solid polymer membrane, and a fuel electrode flow path and an oxidant electrode flow path are provided at both ends thereof. It is composed of an oxidizer electrode flow path plate. In such a fuel cell structure 1, since the electromotive force of one fuel cell is as small as about 1 V, generally 10 or more fuel cell cells 12 are laminated and electrically connected in series to obtain a high voltage output. ing.

また、絶縁板２５には、図１４に示す電流端子３５０に対応する位置に、電流端子３５０を集電板２０まで通すための孔部が設けられている。電流端子３５０は、この孔部を介して集電板２０に接続されている。 Further, the insulating plate 25 is provided with a hole for passing the current terminal 350 to the current collector plate 20 at a position corresponding to the current terminal 350 shown in FIG. The current terminal 350 is connected to the current collector plate 20 via this hole.

図１６は、第３施形態に係る締付板１００の側面図を示す図である。この図１６に示すように、押圧部１１０のセル積層体１０に対向する面側の中央部１１０Ｅは、押圧部１１０のセル積層体１０に対向する面側の部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄよりも、セル積層体１０側に突き出している。図１６では、セル積層体１０に対向する面側の部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄよりも突き出ている中央部１１０Ｅの段差距離をΔｔとしている。 FIG. 16 is a view showing a side view of the tightening plate 100 according to the third embodiment. As shown in FIG. 16, the central portion 110E on the surface side of the pressing portion 110 facing the cell laminate 10 is the partial pressing portions 110A, 110B, 110C on the surface side of the pressing portion 110 facing the cell laminate 10. It protrudes toward the cell laminate 10 side from 110D. In FIG. 16, the step distance of the central portion 110E protruding from the partial pressing portions 110A, 110B, 110C, and 110D on the surface side facing the cell laminated body 10 is defined as Δt.

複数の連結具２００が複数の締結部１２２Ａ、１２２Ｂ、１２２Ｃ、１２２Ｄに固定されていない状態では、押圧部１１０の中央部１１０Ｅは、押圧部１１０の折り返し部１１２Ａ、１１２Ｂ、１１２Ｃ、１１２Ｄよりも、０．６ｍｍ乃至０．７ｍｍの範囲内の大きさでセル積層体１０側に突き出している。 In a state where the plurality of connecting members 200 are not fixed to the plurality of fastening portions 122A, 122B, 122C, 122D, the central portion 110E of the pressing portion 110 is more than the folded portion 112A, 112B, 112C, 112D of the pressing portion 110. It protrudes toward the cell laminate 10 with a size within the range of 0.6 mm to 0.7 mm.

一方で、複数の連結具２００が複数の締結部１２２Ａ、１２２Ｂ、１２２Ｃ、１２２Ｄに固定された状態では、押圧部１１０のセル積層体１０に対向する面側の中央に位置する部分押圧部１１０Ｅと、その周囲の部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄは、ともにセル積層体１０を締め付ける。すなわち、この場合、押圧部１１０のセル積層体１０に対向する面側の中央に位置する部分押圧部１１０Ｅと、その周囲の部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄはともに、複数の連結具２００の締めつけ力により面一となってセル積層体１０を押圧し、面圧は均一になる。 On the other hand, in a state where the plurality of connecting members 200 are fixed to the plurality of fastening portions 122A, 122B, 122C, 122D, the partial pressing portion 110E located at the center of the pressing portion 110 facing the cell laminated body 10 , The partial pressing portions 110A, 110B, 110C, 110D around the same tighten the cell laminate 10. That is, in this case, the partial pressing portion 110E located in the center of the pressing portion 110 on the surface side facing the cell laminate 10 and the peripheral partial pressing portions 110A, 110B, 110C, 110D are both a plurality of connecting tools 200. By the tightening force of, the cell laminate 10 is pressed so as to be flush with each other, and the surface pressure becomes uniform.

上述のように、厚さ２．６ミリメータの高張力鋼（引っ張り強度４４０ＭＰａ）を母材とし、金型を使用して複数回の加圧プレス工程を経て締付板１００を製作した。ここでは、比較例として段差距離Δｔ＝０．１〜０．７ミリメータの締付板１００を製作した。また、特許文献１に記載の締付板と同様の構成の締付板を従来例として評価した。 As described above, the tightening plate 100 was manufactured by using a high-strength steel (tensile strength of 440 MPa) having a thickness of 2.6 mm as a base material and performing a plurality of pressure pressing steps using a die. Here, as a comparative example, a tightening plate 100 having a step distance Δt = 0.1 to 0.7 millimeter was manufactured. Further, a tightening plate having the same configuration as the tightening plate described in Patent Document 1 was evaluated as a conventional example.

評価として、セル積層体１０の面圧分布を測定した。図１７は、集電板２０とセル積層体１０の境界面における面圧を測定した領域を示す図である。ここでは、図１７に示すように、集電板２０とセル積層体１０との境界面における領域１〜１３の面圧を測定し、評価を行った。 As an evaluation, the surface pressure distribution of the cell laminate 10 was measured. FIG. 17 is a diagram showing a region where the surface pressure at the interface between the current collector plate 20 and the cell laminate 10 is measured. Here, as shown in FIG. 17, the surface pressures of regions 1 to 13 at the interface between the current collector plate 20 and the cell laminate 10 were measured and evaluated.

図１８は、段差距離Δｔと面圧の標準偏差との関係についてまとめた図である。図１９は、セル積層体１０における面圧分布の標準偏差を示すグラフの図である。横軸は段差距離Δｔを示し、縦軸は面圧分布の標準偏差を示す。図１８及び図１９に示すように、段差距離Δｔが小さくなるに従い、面圧の標準偏差が増加する。これは、連結具２００の締付力で締付板１００の中央部がたわみ、段差距離Δｔが小さくなるに従い、中央部にかかる押圧が低減するためである。これにより、面圧が不均一となると共に、抵抗増大の原因となっている。 FIG. 18 is a diagram summarizing the relationship between the step distance Δt and the standard deviation of the surface pressure. FIG. 19 is a graph showing the standard deviation of the surface pressure distribution in the cell laminate 10. The horizontal axis represents the step distance Δt, and the vertical axis represents the standard deviation of the surface pressure distribution. As shown in FIGS. 18 and 19, the standard deviation of the surface pressure increases as the step distance Δt decreases. This is because the central portion of the tightening plate 100 is bent by the tightening force of the connector 200, and the pressure applied to the central portion is reduced as the step distance Δt becomes smaller. As a result, the surface pressure becomes non-uniform and causes an increase in resistance.

逆に、Δｔの増加に伴い、中央部付近の面圧不足が解消する。したがって、Δｔの値を調整することで、面圧の標準偏差が最小化する。本実施形態に係る締付板１００では、Δｔを０．６〜０．７ミリメータの範囲内とすることで、面圧の標準偏差が最小化している。この値は、従来例１で示す曲げ加工した部材を溶接した締付板よりも低い値となっている。すなわち、本実施形態に係る締付板１００が連結具２００に締結された場合、従来用いられている一般的な締付板よりも面圧がより均一化する。このように、締付板１００の軽量化、薄型化を進めることで発生しうるたわみにも、例えば１ミリメータ未満の段差を設けることで、対応可能となる。 On the contrary, as Δt increases, the lack of surface pressure near the central portion is resolved. Therefore, by adjusting the value of Δt, the standard deviation of the surface pressure is minimized. In the tightening plate 100 according to the present embodiment, the standard deviation of the surface pressure is minimized by setting Δt within the range of 0.6 to 0.7 millimeter. This value is lower than that of the tightening plate obtained by welding the bent member shown in Conventional Example 1. That is, when the tightening plate 100 according to the present embodiment is fastened to the connector 200, the surface pressure becomes more uniform than that of a general tightening plate conventionally used. As described above, the deflection that may occur due to the weight reduction and thinning of the tightening plate 100 can be dealt with by providing a step of less than 1 mm, for example.

図２０は、セル積層体１０の発電特性を示す図である。縦軸は平均セル電圧を示し、横軸は、電流密度を示す。ここで、平均セル電圧は、セル積層体１０を構成する各単セルの電圧平均値であり、電流密度は、各単セルを流れる電流の密度である。この図２０に示すように、本実施形態に係る締付板１００が連結具２００に締結された場合、電流密度の増加に伴う、平均セル電圧の低下が全範囲で一番少なく、最も発電特性が良いことを示している。このように、セル積層体１０の面圧分布を均一化すると、セル積層体１０の発電特性もより改善される。 FIG. 20 is a diagram showing the power generation characteristics of the cell laminate 10. The vertical axis shows the average cell voltage, and the horizontal axis shows the current density. Here, the average cell voltage is the voltage average value of each single cell constituting the cell laminate 10, and the current density is the density of the current flowing through each single cell. As shown in FIG. 20, when the tightening plate 100 according to the present embodiment is fastened to the connector 200, the decrease in the average cell voltage due to the increase in the current density is the smallest in the entire range, and the power generation characteristic is the highest. Shows that is good. By making the surface pressure distribution of the cell laminate 10 uniform in this way, the power generation characteristics of the cell laminate 10 are further improved.

以上説明したように、本実施形態に係る燃料電池締付構造体３０によれば、締付板１００の押圧部１１０のセル積層体１０に対向する面側の中央部１１０Ｅを、押圧部のセル積層体に対向する面側の縁部よりも、セル積層体１０側に突き出すことで、所定圧で締付板１１０を締結する場合にたわみが生じても、押圧部１１０のセル積層体に対向する面側の中央部１１０Ｅの押圧力を維持でき、セル積層体１０の面圧分布をより均一化できる。このため、セル積層体１０の発電特性もより改善される。 As described above, according to the fuel cell tightening structure 30 according to the present embodiment, the central portion 110E on the surface side of the pressing portion 110 of the tightening plate 100 facing the cell laminate 10 is the cell of the pressing portion. By projecting toward the cell laminate 10 side from the edge portion on the surface side facing the laminate, even if bending occurs when the tightening plate 110 is fastened at a predetermined pressure, it faces the cell laminate of the pressing portion 110. The pressing force of the central portion 110E on the surface side can be maintained, and the surface pressure distribution of the cell laminate 10 can be made more uniform. Therefore, the power generation characteristics of the cell laminate 10 are further improved.

（第４実施形態）
第４実施形態に係る締付板１００は、セル積層体１０を破損させることなく、締付体１００の締付力を適正化するものである。 (Fourth Embodiment)
The tightening plate 100 according to the fourth embodiment optimizes the tightening force of the tightening body 100 without damaging the cell laminated body 10.

以下に第３実施形態と相違する点を説明する。第３実施形態と同等の構成には、同一の番号を付して説明を省略する。 The differences from the third embodiment will be described below. The same number will be assigned to the configuration equivalent to that of the third embodiment, and the description thereof will be omitted.

図９を参照にしつつ、図２１及び図２２に基づき、第４実施形態に係る締付板１００の構成を説明する。図２１は、第４実施形態に係る締付板１００の背面、すなわちセル積層体１０に対向する面側の構造を示す図である。図２２は、締付板１００を連結具２００に締結する工程順序を示す図である。 The configuration of the tightening plate 100 according to the fourth embodiment will be described with reference to FIGS. 9 and 22 with reference to FIGS. 21 and 22. FIG. 21 is a diagram showing a structure on the back surface of the tightening plate 100 according to the fourth embodiment, that is, on the surface side facing the cell laminate 10. FIG. 22 is a diagram showing a process sequence for fastening the tightening plate 100 to the connector 200.

図２１及び図２２に示すように、締付板１００は、梁部１２０により分断された複数の部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄ、１１０Ｅを有し、複数の部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄ、１１０Ｅのうち、部分押圧部１１０Ｅは、押圧部１１０の中央に配置され、それ以外の部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄは、部分押圧部１１０Ｅの周囲に配置されている。部分押圧部１１０Ｅは第３の実施形態と同様にセル積層体１０側に突き出していてもよいし、第１または第２の実施形態のように突き出していなくてもよい。 As shown in FIGS. 21 and 22, the tightening plate 100 has a plurality of partial pressing portions 110A, 110B, 110C, 110D, 110E divided by the beam portion 120, and the plurality of partial pressing portions 110A, 110B, Of the 110C, 110D and 110E, the partial pressing portion 110E is arranged in the center of the pressing portion 110, and the other partial pressing portions 110A, 110B, 110C and 110D are arranged around the partial pressing portion 110E. The partial pressing portion 110E may or may not protrude toward the cell laminate 10 side as in the third embodiment, or may not protrude as in the first or second embodiment.

また、図９、図２１及び図２２に示すよう、部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄ、１１０Ｅは、梁部１２０に接している。図２１は、締付体１００をセル積層体１０側から見た図であり、梁部１２０の部分は、凹状に窪んでいる。部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄ、１１０Ｅは、凹状に窪んだ部分に接するように配置されている。 Further, as shown in FIGS. 9, 21 and 22, the partial pressing portions 110A, 110B, 110C, 110D and 110E are in contact with the beam portion 120. FIG. 21 is a view of the tightening body 100 viewed from the cell laminated body 10 side, and the portion of the beam portion 120 is recessed in a concave shape. The partial pressing portions 110A, 110B, 110C, 110D, and 110E are arranged so as to be in contact with the concavely recessed portions.

部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄ、１１０Ｅのセル積層体１０に対向する面側は、平坦または曲面であり、積層体受け部４００として機能する。積層体受け部４００は、セル積層体１０を積層方向の両側から押圧する部分であり、理想的には、セル積層体１０の端面の全体が積層体受け部４００に面接触するのが望ましい。本実施形態では、部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄ、１１０Ｅのセル積層体１０側の面を平坦または曲面にしているため、セル積層体１０の両端面との接触性がよくなる。なお、セル積層体１０の両端面には、上述のように絶縁板２５が配置されている。 The surface side of the partial pressing portions 110A, 110B, 110C, 110D, and 110E facing the cell laminate 10 is flat or curved, and functions as the laminate receiving portion 400. The laminate receiving portion 400 is a portion that presses the cell laminate 10 from both sides in the lamination direction, and ideally, it is desirable that the entire end surface of the cell laminate 10 comes into surface contact with the laminate receiving portion 400. In the present embodiment, since the surfaces of the partial pressing portions 110A, 110B, 110C, 110D, and 110E on the cell laminate 10 side are flat or curved, the contact with both end surfaces of the cell laminate 10 is improved. Insulating plates 25 are arranged on both end faces of the cell laminate 10 as described above.

また、部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄ、１１０Ｅのセル積層体１０側の面を平坦または曲面にするということは、角部がないことを意味し、締付体１００にてセル積層体１０を締め付けたときに、セル積層体１０の両端面を傷付けるおそれがなくなる。 Further, making the surface of the partial pressing portions 110A, 110B, 110C, 110D, 110E on the cell laminate 10 side flat or curved means that there are no corners, and the cell laminate 100 is used as the tightening body 100. When the 10 is tightened, there is no risk of damaging both end surfaces of the cell laminate 10.

また、第３の実施形態と同様に、押圧部１１０の中央に位置する部分押圧部１１０Ｅを、セル積層体１０側に突き出させることで、より、セル積層体１０との接触性を向上できる。これにより、締付板１００の締結時にたわみが生じた場合に、曲面が平坦化し、たわみの影響を低減可能である。なお、本実施形態に係る締付板１００の材料は、例えば、高張力鋼、亜鉛メッキ工板、ＳＵＳ板などである。 Further, as in the third embodiment, by projecting the partial pressing portion 110E located at the center of the pressing portion 110 toward the cell laminated body 10, the contact property with the cell laminated body 10 can be further improved. As a result, when the tightening plate 100 is bent when it is fastened, the curved surface is flattened and the influence of the bending can be reduced. The material of the tightening plate 100 according to the present embodiment is, for example, high-strength steel, galvanized plate, SUS plate, or the like.

図２２に示すように、本実施形態に係る締付板１００の締結部１２２Ａ、１２２Ｂ、１２２Ｃ、１２２Ｄは、平坦面部１２８Ａ、１２８Ｂ、１２８Ｃ、１２８Ｄを有している。平坦面部１２８Ａ、１２８Ｂ、１２８Ｃ、１２８Ｄは、梁部１２０におけるタイロッド２０２を通す孔部の周辺に配置されており、座金２０４が接触する部分である。座金２０４が接触する部分が湾曲した形状を持つと、締付時に座金２０４が梁部１２０の上で傾き、タイロッド２０２がセル積層体１０に対して傾くことがある。タイロッド２０２が斜めに傾いた状態でセル積層体１０を締め付けると、セル積層体１０の締付力が狙いの締付圧とならなくなってしまう。このため、セル積層体１０中のシール機能の働きが弱くなり、ガスリークが生じえる。また締付面圧が小さくなることで燃料電池セル間の接触抵抗が大きくなり、発電効率が低下することがある。さらには、タイロッド２０２が斜めに傾いた状態でセル積層体１０を締め付けると、締付板１００の座金接触部に傾いた方向で力が掛かり、締付板１００が破損してしまう恐れがある。 As shown in FIG. 22, the fastening portions 122A, 122B, 122C, and 122D of the tightening plate 100 according to the present embodiment have flat surface portions 128A, 128B, 128C, and 128D. The flat surface portions 128A, 128B, 128C, and 128D are arranged around the hole portion through which the tie rod 202 is passed in the beam portion 120, and are the portions where the washer 204 contacts. If the portion in contact with the washer 204 has a curved shape, the washer 204 may be tilted on the beam portion 120 and the tie rod 202 may be tilted with respect to the cell laminate 10 at the time of tightening. If the cell laminate 10 is tightened with the tie rod 202 tilted at an angle, the tightening force of the cell laminate 10 will not be the target tightening pressure. Therefore, the function of the sealing function in the cell laminate 10 is weakened, and a gas leak may occur. Further, as the tightening surface pressure becomes smaller, the contact resistance between the fuel cell cells becomes larger, and the power generation efficiency may decrease. Further, if the cell laminate 10 is tightened with the tie rod 202 tilted at an angle, a force is applied to the washer contact portion of the tightening plate 100 in the tilted direction, and the tightening plate 100 may be damaged.

これに対して、本実施形態に係る締付板１００は、座金２０４が接触する部分に平坦面部１２８Ａ、１２８Ｂ、１２８Ｃ、１２８Ｄを設けているため、座金２０４が平坦面部１２８Ａ、１２８Ｂ、１２８Ｃ、１２８Ｄに面接触する。よって、タイロッド２０２がセル積層体１０に対して傾くという不具合が生じなくなる。よって、本実施形態によれば、セル積層体１０の締付圧を高めることができ、ガスリークを防止できるとともに、発電効率の向上や締付板１００の破損防止を図ることができる。 On the other hand, in the tightening plate 100 according to the present embodiment, since the flat surface portions 128A, 128B, 128C, 128D are provided at the portions where the washer 204 contacts, the washer 204 has the flat surface portions 128A, 128B, 128C, 128D. Face contact with. Therefore, the problem that the tie rod 202 is tilted with respect to the cell laminated body 10 does not occur. Therefore, according to the present embodiment, the tightening pressure of the cell laminate 10 can be increased, gas leakage can be prevented, power generation efficiency can be improved, and damage to the tightening plate 100 can be prevented.

より具体的には、図２２に示すように、タイロッド２０２は、締付板１００の対向する孔部を通り、セル積層体１０とは反対側における締付板１００の平坦面部１２８Ａ、１２８Ｂ、１２８Ｃ、１２８Ｄに締結具であるナット２０６と座金２０４とにより取り付けられる。すなわち、連結具２００は、締結具２０４、２０６を締結させて、対応する締結部１２２Ａ、１２２Ｂ、１２２Ｃ、１２２Ｄに固定される。 More specifically, as shown in FIG. 22, the tie rod 202 passes through the facing holes of the tightening plate 100, and the flat surface portions 128A, 128B, 128C of the tightening plate 100 on the side opposite to the cell laminate 10 , 128D is attached by a nut 206 and a washer 204, which are fasteners. That is, the connecting tool 200 is fixed to the corresponding fastening portions 122A, 122B, 122C, 122D by fastening the fasteners 204 and 206.

また、本実施形態に係る締付板１００は、梁部１２０における凸状の一部を平坦にした抑え部１３０Ａ、１３０Ｂ、１３０Ｃ、１３０Ｄを有している。抑え部１３０Ａ、１３０Ｂ、１３０Ｃ、１３０Ｄは、締付板１００を締結する際に、不図示の締付装置との接触面積を大きくするために設けられている。なお、抑え部１３０Ａ、１３０Ｂ、１３０Ｃ、１３０Ｄの面積と、締付装置側の接触部の面積とを異ならせてもよい。例えば、締付装置側の接触部の面積を抑え部１３０Ａ、１３０Ｂ、１３０Ｃ、１３０Ｄの面積よりも大きくすることで、抑え部１３０Ａ、１３０Ｂ、１３０Ｃ、１３０Ｄと締付装置側の接触部とのずれにも対応可能となる。 Further, the tightening plate 100 according to the present embodiment has holding portions 130A, 130B, 130C, and 130D in which a part of the convex shape of the beam portion 120 is flattened. The holding portions 130A, 130B, 130C, and 130D are provided to increase the contact area with a tightening device (not shown) when fastening the tightening plate 100. The area of the holding portions 130A, 130B, 130C, and 130D may be different from the area of the contact portion on the tightening device side. For example, by making the area of the contact portion on the tightening device side larger than the area of the pressing portions 130A, 130B, 130C, 130D, the displacement between the pressing portions 130A, 130B, 130C, 130D and the contact portion on the tightening device side It will also be possible to deal with.

燃料電池締付構造体３０により燃料電池構造体１を締結する際には、先ず、２つの締付板１００によりセル積層体１０を狭持させる。続いて、不図示の締付装置により締付板１００に所定の圧を加え、セル積層体１０と、集電板２０と、絶縁板２５と、締付板１００とを仮固定する。この場合、締付板１００の抑え部１３０Ａ、１３０Ｂ、１３０Ｃ、１３０Ｄが、締付装置と接する。抑え部１３０Ａ、１３０Ｂ、１３０Ｃ、１３０Ｄは平面であり、締付装置の接触部も平面であるので、抑え部１３０Ａ、１３０Ｂ、１３０Ｃ、１３０Ｄと締付装置とは平面が重なるように接する。 When the fuel cell structure 1 is fastened by the fuel cell tightening structure 30, first, the cell laminate 10 is narrowed by the two tightening plates 100. Subsequently, a predetermined pressure is applied to the tightening plate 100 by a tightening device (not shown) to temporarily fix the cell laminate 10, the current collector plate 20, the insulating plate 25, and the tightening plate 100. In this case, the holding portions 130A, 130B, 130C, and 130D of the tightening plate 100 come into contact with the tightening device. Since the holding portions 130A, 130B, 130C, and 130D are flat, and the contacting portion of the tightening device is also flat, the holding portions 130A, 130B, 130C, 130D and the tightening device are in contact with each other so that the flat surfaces overlap.

次に、締結具であるナット２０６を所定の締め付け圧で締め付け、固定する。そして、締付装置が締付板１００に加えている圧を減圧し、締付板１００から締付装置を開放する。 Next, the nut 206, which is a fastener, is tightened and fixed with a predetermined tightening pressure. Then, the pressure applied to the tightening plate 100 by the tightening device is reduced, and the tightening device is released from the tightening plate 100.

本実施形態に係る燃料電池締付構造体３０では、部分押圧部１１０Ａ、１１０Ｂ、１１０Ｃ、１１０Ｄ、１１０Ｅのセル積層体１０に対向する面側を平坦または曲面にしているため、締付板１００の締結時にセル積層体１０との接触性がよくなり、セル積層体１０の両端面を損傷させずに、所望の締付力でセル積層体１０を締め付けることができる。 In the fuel cell tightening structure 30 according to the present embodiment, since the surface side of the partial pressing portions 110A, 110B, 110C, 110D, 110E facing the cell laminate 10 is flat or curved, the tightening plate 100 The contact with the cell laminate 10 is improved at the time of fastening, and the cell laminate 10 can be tightened with a desired tightening force without damaging both end surfaces of the cell laminate 10.

また、本実施形態では、締結部１２２Ａ、１２２Ｂ、１２２Ｃ、１２２Ｄに平坦面部１２８Ａ、１２８Ｂ、１２８Ｃ、１２８Ｄを設けるため、座金２０４が平坦面部１２８Ａ、１２８Ｂ、１２８Ｃ、１２８Ｄに面接触し、タイロッド２０２がセル積層体１０に対して傾くおそれがなくなる。 Further, in the present embodiment, since the flat surface portions 128A, 128B, 128C and 128D are provided on the fastening portions 122A, 122B, 122C and 122D, the washer 204 is in surface contact with the flat surface portions 128A, 128B, 128C and 128D, and the tie rod 202 is formed. There is no risk of tilting with respect to the cell laminate 10.

さらにまた、締付板１００に抑え部１３０Ａ、１３０Ｂ、１３０Ｃ、１３０Ｄを設けることにより、締付装置と締付板１００との接触性がよくなり、締付板１００によるセル積層体１０の締付力を適性化することができる。これにより、セル積層体１０の面圧を均一化できる。 Furthermore, by providing the holding portions 130A, 130B, 130C, and 130D on the tightening plate 100, the contact between the tightening device and the tightening plate 100 is improved, and the cell laminate 10 is tightened by the tightening plate 100. The force can be optimized. As a result, the surface pressure of the cell laminate 10 can be made uniform.

以上、本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施することが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これらの実施形態やその変形例は、発明の範囲や要旨に含まれると共に、特許請求の範囲に記載された発明とその均等の範囲に含まれる。 Although some embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and variations thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and the equivalent scope thereof.

１：燃料電池構造体、１０：セル積層体、２０：集電板、２５：絶縁板２５、３０：燃料電池締付構造体、１００：締付板、１１０：押圧部、１１０Ａ〜Ｅ：部分押圧部、１１２Ａ〜Ｄ：折り返し部、１２０：梁部、１２２Ａ〜Ｄ：締結部、１２４Ａ〜Ｄ：凸状部、１２６Ａ〜Ｄ：鍔部、２００：連結具、３００Ａ〜Ｈ：面接合部、３５０：電流端子 1: Fuel cell structure, 10: Cell laminate, 20: Current collector plate, 25: Insulation plate 25, 30: Fuel cell tightening structure, 100: Tightening plate, 110: Pressing part, 110A to E: Part Pressing part, 112A to D: Folded part, 120: Beam part, 122A to D: Fastening part, 124A to D: Convex part, 126A to D: Flange part, 200: Connecting tool, 300A to H: Surface joining part, 350: Current terminal

Claims (8)

複数の燃料電池セルが積層されたセル積層体と、
前記セル積層体の積層方向の両端面側から前記セル積層体を締め付ける２つの締付板と、を備え、
前記２つの締付板のそれぞれは、
前記セル積層体の積層方向の両端面に対向配置され、前記セル積層体を積層方向に押圧する押圧部と、
前記押圧部の前記セル積層体に対向する面とは反対の面側に突き出して前記押圧部の面に沿って延在する凸状の梁部と、を有し、
前記梁部は一端側の締結部から他端側の締結部まで、連続的に凸状高さを変化させ、中央部から外周部にかけて徐々に高くなるような形状を有し、
前記押圧部は前記面方向に交差する方向に折り曲げられた折り返し部を有し、
前記押圧部の前記セル積層体に対向する面側の中央部は、前記押圧部の前記セル積層体に対向する面側の縁部よりも、前記セル積層体側に突き出しており、
前記押圧部と前記梁部とは、一体成形されている、燃料電池構造体。 A cell laminate in which multiple fuel cell cells are laminated, and
Two tightening plates for tightening the cell laminate from both end faces in the stacking direction of the cell laminate are provided.
Each of the two tightening plates
A pressing portion that is arranged to face both end faces of the cell laminate in the stacking direction and presses the cell laminate in the stacking direction.
It has a convex beam portion that protrudes toward the surface of the pressing portion opposite to the surface facing the cell laminate and extends along the surface of the pressing portion.
The beam portion has a shape in which the convex height is continuously changed from the fastening portion on one end side to the fastening portion on the other end side, and gradually increases from the central portion to the outer peripheral portion.
The pressing portion has a folded portion that is bent in a direction intersecting the surface direction.
The central portion of the pressing portion on the surface side facing the cell laminate protrudes toward the cell laminate side from the edge portion of the pressing portion on the surface side facing the cell laminate.
A fuel cell structure in which the pressing portion and the beam portion are integrally molded. 前記梁部は、前記押圧部の中心位置に対して点対称に配置されている、請求項１に記載の燃料電池構造体。 The fuel cell structure according to claim 1, wherein the beam portion is arranged point-symmetrically with respect to the center position of the pressing portion. 前記２つの締付部を連結させる複数の連結具を備え、
前記梁部は、前記複数の連結具を固定する複数の締結部を有し、
前記複数の締結部は、前記梁部の長手方向の縁側に配置されており、
前記２つの締付板は、前記複数の連結具を前記複数の締結部に固定することで、前記セル積層体を積層方向に押圧する、請求項２に記載の燃料電池構造体。 A plurality of connecting tools for connecting the two tightening portions are provided.
The beam portion has a plurality of fastening portions for fixing the plurality of connecting members.
The plurality of fastening portions are arranged on the veranda side of the beam portion in the longitudinal direction.
The fuel cell structure according to claim 2, wherein the two tightening plates press the cell laminate in the stacking direction by fixing the plurality of connecting tools to the plurality of fastening portions. 前記複数の連結具が前記複数の締結部に固定されたときに、前記押圧部の前記セル積層体に対向する面側の縁部および中央部は、ともに前記セル積層体を積層方向に押圧する、請求項３に記載の燃料電池構造体。 When the plurality of connecting tools are fixed to the plurality of fastening portions, the edge portion and the central portion of the pressing portion on the surface side facing the cell laminate both press the cell laminate in the stacking direction. , The fuel cell structure according to claim 3. 前記複数の連結具が前記複数の締結部に固定されていないときに、前記押圧部の前記セル積層体に対向する面側の中央部は、前記押圧部の前記セル積層体に対向する面側の縁部よりも、０．６ｍｍ乃至０．７ｍｍの範囲内の大きさで前記セル積層体側に突き出している、請求項３または４に記載の燃料電池構造体。 When the plurality of connecting tools are not fixed to the plurality of fastening portions, the central portion of the pressing portion on the surface side facing the cell laminate is the surface side of the pressing portion facing the cell laminate. The fuel cell structure according to claim 3 or 4, which protrudes toward the cell laminate with a size within the range of 0.6 mm to 0.7 mm from the edge of the fuel cell. 前記押圧部は、前記梁部により分断された複数の部分押圧部を有し、
前記複数の部分押圧部のうち一つは、前記押圧部の中心位置を含む場所に配置され、
前記押圧部の中心位置を含む場所に配置された部分押圧部は、前記複数の連結具が前記複数の締結部に固定されていないときに、その他の部分押圧部よりも、前記セル積層体側に突き出している、請求項３乃至５のいずれか一項に記載の燃料電池構造体。 The pressing portion has a plurality of partial pressing portions divided by the beam portion.
One of the plurality of partial pressing portions is arranged at a location including the center position of the pressing portion.
The partial pressing portion arranged at a location including the central position of the pressing portion is closer to the cell laminate side than the other partial pressing portions when the plurality of connecting tools are not fixed to the plurality of fastening portions. The fuel cell structure according to any one of claims 3 to 5, which is protruding. 前記締結部は、平坦面部を有し、
前記連結具は、前記平坦面部に締結具を締結させて、対応する前記締結部に固定される、請求項３乃至６のいずれか一項に記載の燃料電池構造体。 The fastening portion has a flat surface portion and has a flat surface portion.
The fuel cell structure according to any one of claims 3 to 6, wherein the connecting tool is fixed to the corresponding fastening portion by fastening the fastener to the flat surface portion. 前記セル積層体の積層方向の端面に対向配置される集電板と、
前記集電板と、前記締付板との間に配置される絶縁板と、
前記集電板に接続される電流端子と、を備え、
前記電流端子は、前記２つの締付部を前記複数の連結具に連結させたときに、前記絶縁板に設けられた穴部を通過して、前記押圧部の前記セル積層体に対向する面側の中央部に接触される、請求項１乃至７のいずれか一項に記載の燃料電池構造体。 A current collector plate arranged to face the end face of the cell laminate in the stacking direction,
An insulating plate arranged between the current collector plate and the tightening plate,
A current terminal connected to the current collector plate is provided.
The current terminal passes through a hole provided in the insulating plate when the two tightening portions are connected to the plurality of connecting tools, and the surface of the pressing portion facing the cell laminate. The fuel cell structure according to any one of claims 1 to 7, which is brought into contact with the central portion of the side.
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