JP2013187030A

JP2013187030A - Fuel cell unit cell and method for manufacturing fuel cell unit cell

Info

Publication number: JP2013187030A
Application number: JP2012051074A
Authority: JP
Inventors: Tomokazu Hayashi; 友和林
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2012-03-08
Filing date: 2012-03-08
Publication date: 2013-09-19
Anticipated expiration: 2032-03-08
Also published as: JP5900034B2

Abstract

【課題】燃料電池セルの製造時に、膜電極ガス拡散層接合体とセパレータとの間に配置される流路形成部材（多孔体）に液状シール材が流れ込むことを抑制する。
【解決手段】燃料電池セル１００は、膜電極ガス拡散層接合体１０と、多孔体からなる流路形成部材２０ｃと、一対のセパレータ３０と、流動性を有する液状シール材を硬化することによって形成されたシール材５０と、シーリングプレート４０と、を備える。セパレータ３０は、空気導入用貫通孔３２ｉおよびカソードオフガス排出用貫通孔３２ｏを備える。流路形成部材２０ｃおよびシーリングプレート４０は、空気導入用貫通孔３２ｉ内およびカソードオフガス排出用貫通孔３２ｏ内に張り出すように形成されている。さらに、シーリングプレート４０は、流路形成部材２０ｃよりも、空気導入用貫通孔３２ｉ内およびカソードオフガス排出用貫通孔３２ｏ内に張り出すように形成されている。
【選択図】図１A liquid sealing material is prevented from flowing into a flow path forming member (porous body) disposed between a membrane electrode gas diffusion layer assembly and a separator during manufacture of a fuel cell.
A fuel cell 100 is formed by curing a membrane electrode gas diffusion layer assembly 10, a flow path forming member 20c made of a porous body, a pair of separators 30, and a liquid sealing material having fluidity. The sealing material 50 and the sealing plate 40 are provided. The separator 30 includes an air introduction through hole 32i and a cathode offgas discharge through hole 32o. The flow path forming member 20c and the sealing plate 40 are formed so as to protrude into the air introduction through hole 32i and the cathode off gas discharge through hole 32o. Further, the sealing plate 40 is formed so as to protrude beyond the flow path forming member 20c into the air introduction through hole 32i and the cathode off gas discharge through hole 32o.
[Selection] Figure 1

Description

本発明は、燃料電池セル、および、燃料電池セルの製造方法に関するものである。 The present invention relates to a fuel cell and a method for manufacturing the fuel cell.

燃料電池セルは、例えば、膜電極接合体の表面にガス拡散層を接合してなる膜電極ガス拡散層接合体をセパレータで挟持することによって構成される。膜電極接合体は、電解質膜の両面に電極を接合してなる。この燃料電池セルでは、膜電極ガス拡散層接合体とセパレータとの間に、ガス拡散層の表面に沿って発電に供する反応ガスを流すためのガス流路を形成する流路形成部材として、多孔体が配置される場合がある（例えば、下記特許文献１参照）。 The fuel battery cell is configured, for example, by sandwiching a membrane electrode gas diffusion layer assembly formed by bonding a gas diffusion layer to the surface of the membrane electrode assembly with a separator. The membrane electrode assembly is formed by bonding electrodes to both surfaces of an electrolyte membrane. In this fuel cell, as a flow path forming member that forms a gas flow path for flowing a reactive gas for power generation along the surface of the gas diffusion layer between the membrane electrode gas diffusion layer assembly and the separator, A body may be arranged (for example, refer to the following Patent Document 1).

そして、このような燃料電池セルに関し、種々の技術が提案されている。例えば、下記特許文献１に記載された技術では、多孔体を、単セル（燃料電池セル）が備えるマニホールド内に張り出して配置している。なお、下記特許文献１に記載された技術では、膜電極ガス拡散層接合体は、その外周部にシール部を一体的に備えている。このシール部は、弾性を有する絶縁性樹脂材料によって形成される。 Various techniques have been proposed for such fuel cells. For example, in the technique described in Patent Document 1 below, the porous body is disposed so as to protrude into a manifold included in a single cell (fuel cell). In the technique described in Patent Document 1 below, the membrane electrode gas diffusion layer assembly is integrally provided with a seal portion on the outer periphery thereof. This seal part is formed of an insulating resin material having elasticity.

特開２００８−００４４９４号公報JP 2008-004494 A

ところで、膜電極ガス拡散層接合体の周囲に設けられるシール部（シール材）は、燃料電池セルの製造時に、例えば、セパレータの表面に、流動性を有する液状シール材を塗布して、この液状シール材をセパレータで挟んで加圧し、熱硬化することによって形成される場合もある。そして、このような構成を、上記特許文献１に記載された構成、すなわち、多孔体を、燃料電池セルが備えるマニホールド内に張り出して配置する構成に適用する場合には、液状シール材と多孔体との間に、液状シール材の多孔体への流入を防止するためのシーリングプレートが配置されることが好ましい。 By the way, the seal portion (seal material) provided around the membrane electrode gas diffusion layer assembly is coated with a liquid seal material having fluidity on the surface of the separator, for example, when the fuel cell is manufactured. In some cases, a sealant is sandwiched between separators, pressurized, and thermally cured. And when applying such a structure to the structure described in the above-mentioned Patent Document 1, that is, the structure in which the porous body is overlaid and arranged in the manifold provided in the fuel cell, the liquid sealing material and the porous body A sealing plate for preventing the liquid sealing material from flowing into the porous body is preferably disposed between the two.

しかし、液状シール材と多孔体との間にシーリングプレートを配置しても、液状シール材を加圧して熱硬化するときに、液状シール材が加圧によって押し広げられて、マニホールド内において、シーリングプレートの外周部からはみ出して、反対側（多孔体側）に回り込み、多孔体に流れ込む場合があった。この場合、液状シール材が多孔体に流れ込んで形成されたシール材によって、多孔体の一部が閉塞され、所望のガス流路が形成されなくなる。 However, even if a sealing plate is placed between the liquid sealing material and the porous body, when the liquid sealing material is pressurized and thermally cured, the liquid sealing material is spread by the pressure and the sealing is performed in the manifold. In some cases, the plate protrudes from the outer peripheral portion of the plate, turns around to the opposite side (porous body side), and flows into the porous body. In this case, a part of the porous body is blocked by the sealing material formed by flowing the liquid sealing material into the porous body, and a desired gas flow path is not formed.

本発明は、上述の課題を解決するためになされたものであり、燃料電池セルの製造時に、膜電極ガス拡散層接合体とセパレータとの間に配置される流路形成部材（多孔体）に液状シール材が流れ込むことを抑制することを目的とする。 The present invention has been made in order to solve the above-described problems, and a flow path forming member (porous body) disposed between a membrane electrode gas diffusion layer assembly and a separator at the time of manufacturing a fuel cell. It aims at suppressing that a liquid sealing material flows.

本発明は、上述の課題の少なくとも一部を解決するためになされたものであり、以下の形態又は適用例として実現することが可能である。 SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

［適用例１］
燃料電池セルであって、
電解質膜の両面に電極を接合してなる膜電極接合体と、前記膜電極接合体の表面に接合されたガス拡散層と、を有する膜電極ガス拡散層接合体と、
前記ガス拡散層の表面に積層され、前記ガス拡散層の表面に沿って発電に供する反応ガスを流すためのガス流路を形成する流路形成部材であって、多孔体からなる流路形成部材と、
前記膜電極ガス拡散層接合体、および、前記流路形成部材を挟持する一対のセパレータと、
前記一対のセパレータの間における前記膜電極ガス拡散層接合体の周囲に形成されたシール材であって、流動性を有する液状シール材を硬化することによって形成されたシール材と、
前記シール材と前記流路形成部材との間に配置され、前記シール材を形成する際に、前記液状シール材の前記流路形成部材への流入を防止するためのシーリングプレートと、
を備え、
前記セパレータは、前記セパレータの厚さ方向に貫通する導入用貫通孔であって、前記燃料電池セルの外部から供給された前記反応ガスを前記流路形成部材に導入するための導入用貫通孔を備えており、
前記シール材は、前記一対のセパレータの間における前記導入用貫通孔の周囲に形成されており、
前記流路形成部材、および、前記シーリングプレートは、前記厚さ方向から見たときに、前記導入用貫通孔内に張り出すように形成されている、
燃料電池セル。 [Application Example 1]
A fuel cell,
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, the sealing material formed by curing a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator is an introduction through-hole penetrating in the thickness direction of the separator, the introduction through-hole for introducing the reaction gas supplied from the outside of the fuel cell into the flow path forming member. With
The sealing material is formed around the introduction through hole between the pair of separators,
The flow path forming member and the sealing plate are formed so as to protrude into the introduction through-hole when viewed from the thickness direction.
Fuel cell.

適用例１の燃料電池セルでは、流路形成部材、および、シーリングプレートが、導入用貫通孔内に張り出すように形成されている。このため、燃料電池セルの製造時に、すなわち、液状シール材を加圧して硬化し、シール材を形成する際に、液状シール材が加圧によって押し広げられても、導入用貫通孔内において、シーリングプレートの外周部からはみ出して、反対側（流路形成部材側）に回り込むこと（以下、単に「液状シール材の回り込み」とも言う）を抑制することができる。したがって、流路形成部材（多孔体）に液状シール材が流れ込むことを抑制することができる。なお、本適用例において、「流動性を有する液状シール材」とは、熱硬化前には常に流動性を有する熱硬化性のシール材と、加熱時に粘度が低下して流動性を発現する熱可塑性の半硬化状態のシール材とを含む。 In the fuel cell of Application Example 1, the flow path forming member and the sealing plate are formed so as to project into the through hole for introduction. For this reason, at the time of manufacturing the fuel cell, that is, when the liquid sealing material is pressurized and cured to form the sealing material, even if the liquid sealing material is expanded by the pressurization, It is possible to suppress the protrusion from the outer peripheral portion of the sealing plate to the opposite side (flow path forming member side) (hereinafter, also simply referred to as “the liquid seal material wraps around”). Therefore, the liquid sealing material can be prevented from flowing into the flow path forming member (porous body). In this application example, “fluid sealing material having fluidity” means a thermosetting sealing material that always has fluidity before thermosetting, and heat that exhibits fluidity due to a decrease in viscosity during heating. And a plastic semi-cured sealing material.

［適用例２］
適用例１記載の燃料電池セルであって、
前記シーリングプレートは、さらに、前記厚さ方向から見たときに、前記流路形成部材よりも、前記導入用貫通孔内に張り出すように形成されている、
燃料電池セル。 [Application Example 2]
A fuel battery cell according to Application Example 1,
The sealing plate is further formed so as to protrude into the introduction through-hole rather than the flow path forming member when viewed from the thickness direction.
Fuel cell.

適用例２の燃料電池セルによって、さらに、導入用貫通孔内における液状シール材の回り込みを抑制し、流路形成部材（多孔体）に液状シール材が流れ込むことを抑制することができる。 The fuel battery cell of Application Example 2 can further suppress the wraparound of the liquid sealing material in the introduction through hole, and can prevent the liquid sealing material from flowing into the flow path forming member (porous body).

［適用例３］
適用例１または２記載の燃料電池セルであって、
前記シーリングプレートは、さらに、前記厚さ方向から見たときに、前記導入用貫通孔の輪郭線と前記流路形成部材の外周輪郭線との交点から、前記導入用貫通孔内に張り出すように形成されている、
燃料電池セル。 [Application Example 3]
A fuel battery cell according to Application Example 1 or 2,
The sealing plate further protrudes into the introduction through hole from the intersection of the outline of the introduction through hole and the outer periphery outline of the flow path forming member when viewed from the thickness direction. Formed in the
Fuel cell.

適用例３の燃料電池セルでは、さらに、導入用貫通孔の輪郭線と流路形成部材の外周輪郭線との交点からの液状シール材の回り込みを抑制することができる。 In the fuel cell of Application Example 3, it is possible to further suppress the wraparound of the liquid sealing material from the intersection of the introduction through hole contour line and the flow path forming member outer periphery contour line.

［適用例４］
燃料電池セルであって、
電解質膜の両面に電極を接合してなる膜電極接合体と、前記膜電極接合体の表面に接合されたガス拡散層と、を有する膜電極ガス拡散層接合体と、
前記ガス拡散層の表面に積層され、前記ガス拡散層の表面に沿って発電に供する反応ガスを流すためのガス流路を形成する流路形成部材であって、多孔体からなる流路形成部材と、
前記膜電極ガス拡散層接合体、および、前記流路形成部材を挟持する一対のセパレータと、
前記一対のセパレータの間における前記膜電極ガス拡散層接合体の周囲に形成されたシール材であって、流動性を有する液状シール材を硬化することによって形成されたシール材と、
前記シール材と前記流路形成部材との間に配置され、前記シール材を形成する際に、前記液状シール材の前記流路形成部材への流入を防止するためのシーリングプレートと、
を備え、
前記セパレータは、前記セパレータの厚さ方向に貫通する排出用貫通孔であって、前記流路形成部材から排出された排出ガスを前記燃料電池セルの外部に排出するための排出用貫通孔を備えており、
前記シール材は、前記一対のセパレータの間における前記排出用貫通孔の周囲に形成されており、
前記流路形成部材、および、前記シーリングプレートは、前記厚さ方向から見たときに、前記排出用貫通孔内に張り出すように形成されている、
燃料電池セル。 [Application Example 4]
A fuel cell,
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, the sealing material formed by curing a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator includes a discharge through hole penetrating in the thickness direction of the separator, and the discharge through hole for discharging the exhaust gas discharged from the flow path forming member to the outside of the fuel cell. And
The sealing material is formed around the discharge through hole between the pair of separators,
The flow path forming member and the sealing plate are formed so as to protrude into the discharge through hole when viewed from the thickness direction.
Fuel cell.

適用例４の燃料電池セルでは、流路形成部材、および、シーリングプレートが、排出用貫通孔内に張り出すように形成されている。このため、燃料電池セルの製造時に、すなわち、液状シール材を加圧して熱硬化し、シール材を形成する際に、液状シール材が加圧によって押し広げられても、排出用貫通孔内における液状シール材の回り込みを抑制することができる。したがって、流路形成部材（多孔体）に液状シール材が流れ込むことを抑制することができる。なお、本適用例において、「流動性を有する液状シール材」とは、熱硬化前には常に流動性を有する熱硬化性のシール材と、加熱時に粘度が低下して流動性を発現する熱可塑性の半硬化状態のシール材とを含む。 In the fuel cell of Application Example 4, the flow path forming member and the sealing plate are formed so as to protrude into the discharge through hole. For this reason, when the fuel cell is manufactured, that is, when the liquid sealing material is pressurized and thermally cured to form the sealing material, even if the liquid sealing material is expanded by pressurization, The wraparound of the liquid sealing material can be suppressed. Therefore, the liquid sealing material can be prevented from flowing into the flow path forming member (porous body). In this application example, “fluid sealing material having fluidity” means a thermosetting sealing material that always has fluidity before thermosetting, and heat that exhibits fluidity due to a decrease in viscosity during heating. And a plastic semi-cured sealing material.

［適用例５］
適用例４記載の燃料電池セルであって、
前記シーリングプレートは、さらに、前記厚さ方向から見たときに、前記流路形成部材よりも、前記排出用貫通孔内に張り出すように形成されている、
燃料電池セル。 [Application Example 5]
A fuel battery cell according to Application Example 4,
The sealing plate is further formed so as to protrude into the discharge through-hole rather than the flow path forming member when viewed from the thickness direction.
Fuel cell.

適用例５の燃料電池セルによって、さらに、排出用貫通孔内における液状シール材の回り込みを抑制し、流路形成部材（多孔体）に液状シール材が流れ込むことを抑制することができる。 The fuel battery cell of Application Example 5 can further suppress the wraparound of the liquid sealing material in the discharge through hole, and can suppress the liquid sealing material from flowing into the flow path forming member (porous body).

［適用例６］
適用例４または５記載の燃料電池セルであって、
前記シーリングプレートは、さらに、前記厚さ方向から見たときに、前記排出用貫通孔の輪郭線と前記流路形成部材の外周輪郭線との交点から、前記排出用貫通孔内に張り出すように形成されている、
燃料電池セル。 [Application Example 6]
A fuel battery cell according to Application Example 4 or 5,
The sealing plate further protrudes into the discharge through hole from the intersection of the outline of the discharge through hole and the outer periphery of the flow path forming member when viewed from the thickness direction. Formed in the
Fuel cell.

適用例４の燃料電池セルでは、さらに、排出用貫通孔の輪郭線と流路形成部材の外周輪郭線との交点からの液状シール材の回り込みを抑制することができる。 In the fuel cell of Application Example 4, it is possible to further suppress the wraparound of the liquid sealing material from the intersection of the contour line of the discharge through hole and the outer peripheral contour line of the flow path forming member.

［適用例７］
燃料電池セルの製造方法であって、
前記燃料電池セルは、
電解質膜の両面に電極を接合してなる膜電極接合体と、前記膜電極接合体の表面に接合されたガス拡散層と、を有する膜電極ガス拡散層接合体と、
前記ガス拡散層の表面に積層され、前記ガス拡散層の表面に沿って発電に供する反応ガスを流すためのガス流路を形成する流路形成部材であって、多孔体からなる流路形成部材と、
前記膜電極ガス拡散層接合体、および、前記流路形成部材を挟持する一対のセパレータと、
前記一対のセパレータの間における前記膜電極ガス拡散層接合体の周囲に形成されたシール材であって、流動性を有する液状シール材を硬化することによって形成されたシール材と、
前記シール材と前記流路形成部材との間に配置され、前記シール材を形成する際に、前記液状シール材の前記流路形成部材への流入を防止するためのシーリングプレートと、
を備え、
前記セパレータは、前記セパレータの厚さ方向に貫通する導入用貫通孔であって、前記燃料電池セルの外部から供給された前記反応ガスを前記流路形成部材に導入するための導入用貫通孔を備えており、
前記シール材は、前記一対のセパレータの間における前記導入用貫通孔の周囲に形成されており、
前記燃料電池セルの製造方法は、
一方の前記セパレータの表面に、前記液状シール材を塗布する塗布工程と、
前記流路形成部材、および、前記シーリングプレートが、前記導入用貫通孔内に張り出すように、前記一方のセパレータに、前記膜電極ガス拡散層接合体と、前記シーリングプレートと、前記流路形成部材と、他方の前記セパレータと、を積層する積層工程と、
前記液状シール材を熱硬化して前記シール材を形成するシール材形成工程と、
を備える燃料電池セルの製造方法。 [Application Example 7]
A method for producing a fuel cell, comprising:
The fuel battery cell is
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, the sealing material formed by curing a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator is an introduction through-hole penetrating in the thickness direction of the separator, the introduction through-hole for introducing the reaction gas supplied from the outside of the fuel cell into the flow path forming member. With
The sealing material is formed around the introduction through hole between the pair of separators,
The fuel cell manufacturing method includes
An application step of applying the liquid sealing material to the surface of one of the separators;
The membrane electrode gas diffusion layer assembly, the sealing plate, and the flow path formation are formed on the one separator so that the flow path forming member and the sealing plate protrude into the introduction through hole. A laminating step of laminating the member and the other separator;
A sealing material forming step of thermosetting the liquid sealing material to form the sealing material;
A method for producing a fuel cell comprising:

［適用例８］
燃料電池セルの製造方法であって、
前記燃料電池セルは、
電解質膜の両面に電極を接合してなる膜電極接合体と、前記膜電極接合体の表面に接合されたガス拡散層と、を有する膜電極ガス拡散層接合体と、
前記ガス拡散層の表面に積層され、前記ガス拡散層の表面に沿って発電に供する反応ガスを流すためのガス流路を形成する流路形成部材であって、多孔体からなる流路形成部材と、
前記膜電極ガス拡散層接合体、および、前記流路形成部材を挟持する一対のセパレータと、
前記一対のセパレータの間における前記膜電極ガス拡散層接合体の周囲に形成されたシール材であって、流動性を有する液状シール材を硬化することによって形成されたシール材と、
前記シール材と前記流路形成部材との間に配置され、前記シール材を形成する際に、前記液状シール材の前記流路形成部材への流入を防止するためのシーリングプレートと、
を備え、
前記セパレータは、前記セパレータの厚さ方向に貫通する導入用貫通孔であって、前記燃料電池セルの外部から供給された前記反応ガスを前記流路形成部材に導入するための導入用貫通孔を備えており、
前記シール材は、前記一対のセパレータの間における前記導入用貫通孔の周囲に形成されており、
前記燃料電池セルの製造方法は、
半硬化状態の半硬化シール材を配置する工程と、
前記流路形成部材、および、前記シーリングプレートが、前記導入用貫通孔内に張り出すように、一方の前記セパレータに、前記半硬化シール材と、前記膜電極ガス拡散層接合体と、前記シーリングプレートと、前記流路形成部材と、他方の前記セパレータと、を積層する積層工程と、
前記半硬化シール材を硬化して前記シール材を形成するシール材形成工程と、
を備える燃料電池セルの製造方法。 [Application Example 8]
A method for producing a fuel cell, comprising:
The fuel battery cell is
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, the sealing material formed by curing a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator is an introduction through-hole penetrating in the thickness direction of the separator, the introduction through-hole for introducing the reaction gas supplied from the outside of the fuel cell into the flow path forming member. With
The sealing material is formed around the introduction through hole between the pair of separators,
The fuel cell manufacturing method includes
A step of arranging a semi-cured sealing material in a semi-cured state;
One of the separators, the semi-cured sealing material, the membrane electrode gas diffusion layer assembly, and the sealing so that the flow path forming member and the sealing plate protrude into the introduction through hole. A laminating step of laminating a plate, the flow path forming member, and the other separator;
A sealing material forming step of curing the semi-cured sealing material to form the sealing material;
A method for producing a fuel cell comprising:

［適用例９］
燃料電池セルの製造方法であって、
前記燃料電池セルは、
電解質膜の両面に電極を接合してなる膜電極接合体と、前記膜電極接合体の表面に接合されたガス拡散層と、を有する膜電極ガス拡散層接合体と、
前記ガス拡散層の表面に積層され、前記ガス拡散層の表面に沿って発電に供する反応ガスを流すためのガス流路を形成する流路形成部材であって、多孔体からなる流路形成部材と、
前記膜電極ガス拡散層接合体、および、前記流路形成部材を挟持する一対のセパレータと、
前記一対のセパレータの間における前記膜電極ガス拡散層接合体の周囲に形成されたシール材であって、流動性を有する液状シール材を硬化することによって形成されたシール材と、
前記シール材と前記流路形成部材との間に配置され、前記シール材を形成する際に、前記液状シール材の前記流路形成部材への流入を防止するためのシーリングプレートと、
を備え、
前記セパレータは、前記セパレータの厚さ方向に貫通する導入用貫通孔であって、前記燃料電池セルの外部から供給された前記反応ガスを前記流路形成部材に導入するための導入用貫通孔を備えており、
前記シール材は、前記一対のセパレータの間における前記導入用貫通孔の周囲に形成されており、
前記燃料電池セルの製造方法は、
前記流路形成部材、および、前記シーリングプレートが、前記導入用貫通孔内に張り出すように、一方の前記セパレータに、前記膜電極ガス拡散層接合体と、前記シーリングプレートと、前記流路形成部材と、他方の前記セパレータと、を積層する積層工程と、
前記一方のセパレータと前記他方のセパレータとの間に、前記液状シール材を注入する注入工程と、
前記液状シール材を熱硬化して前記シール材を形成するシール材形成工程と、
を備える燃料電池セルの製造方法。 [Application Example 9]
A method for producing a fuel cell, comprising:
The fuel battery cell is
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, the sealing material formed by curing a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator is an introduction through-hole penetrating in the thickness direction of the separator, the introduction through-hole for introducing the reaction gas supplied from the outside of the fuel cell into the flow path forming member. With
The sealing material is formed around the introduction through hole between the pair of separators,
The fuel cell manufacturing method includes
One of the separators, the membrane electrode gas diffusion layer assembly, the sealing plate, and the flow path formation so that the flow path forming member and the sealing plate protrude into the through hole for introduction. A laminating step of laminating the member and the other separator;
An injection step of injecting the liquid sealing material between the one separator and the other separator;
A sealing material forming step of thermosetting the liquid sealing material to form the sealing material;
A method for producing a fuel cell comprising:

適用例７ないし９の燃料電池セルの製造方法によって、適用例１の燃料電池セルを製造することができる。なお、適用例９の燃料電池セルの製造方法において、注入工程には、例えば、インジェクション成型等を用いた射出成型等が適用される。 The fuel cell of Application Example 1 can be manufactured by the manufacturing method of the fuel cell of Application Examples 7 to 9. In the fuel cell manufacturing method according to Application Example 9, for example, injection molding using injection molding or the like is applied to the injection process.

［適用例１０］
燃料電池セルの製造方法であって、
前記燃料電池セルは、
電解質膜の両面に電極を接合してなる膜電極接合体と、前記膜電極接合体の表面に接合されたガス拡散層と、を有する膜電極ガス拡散層接合体と、
前記ガス拡散層の表面に積層され、前記ガス拡散層の表面に沿って発電に供する反応ガスを流すためのガス流路を形成する流路形成部材であって、多孔体からなる流路形成部材と、
前記膜電極ガス拡散層接合体、および、前記流路形成部材を挟持する一対のセパレータと、
前記一対のセパレータの間における前記膜電極ガス拡散層接合体の周囲に形成されたシール材であって、流動性を有する液状シール材を硬化することによって形成されたシール材と、
前記シール材と前記流路形成部材との間に配置され、前記シール材を形成する際に、前記液状シール材の前記流路形成部材への流入を防止するためのシーリングプレートと、
を備え、
前記セパレータは、前記セパレータの厚さ方向に貫通する排出用貫通孔であって、前記流路形成部材から排出された排出ガスを前記燃料電池セルの外部に排出するための排出用貫通孔を備えており、
前記シール材は、前記一対のセパレータの間における前記排出用貫通孔の周囲に形成されており、
前記燃料電池セルの製造方法は、
一方の前記セパレータの表面に、前記液状シール材を塗布する塗布工程と、
前記流路形成部材、および、前記シーリングプレートが、前記排出用貫通孔内に張り出すように、前記一方のセパレータに、前記膜電極ガス拡散層接合体と、前記シーリングプレートと、前記流路形成部材と、他方の前記セパレータと、を積層する積層工程と、
前記液状シール材を熱硬化して前記シール材を形成するシール材形成工程と、
を備える燃料電池セルの製造方法。 [Application Example 10]
A method for producing a fuel cell, comprising:
The fuel battery cell is
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, the sealing material formed by curing a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator includes a discharge through hole penetrating in the thickness direction of the separator, and the discharge through hole for discharging the exhaust gas discharged from the flow path forming member to the outside of the fuel cell. And
The sealing material is formed around the discharge through hole between the pair of separators,
The fuel cell manufacturing method includes
An application step of applying the liquid sealing material to the surface of one of the separators;
The membrane electrode gas diffusion layer assembly, the sealing plate, and the flow path formation are formed on the one separator so that the flow path forming member and the sealing plate project into the discharge through hole. A laminating step of laminating the member and the other separator;
A sealing material forming step of thermosetting the liquid sealing material to form the sealing material;
A method for producing a fuel cell comprising:

［適用例１１］
燃料電池セルの製造方法であって、
前記燃料電池セルは、
電解質膜の両面に電極を接合してなる膜電極接合体と、前記膜電極接合体の表面に接合されたガス拡散層と、を有する膜電極ガス拡散層接合体と、
前記ガス拡散層の表面に積層され、前記ガス拡散層の表面に沿って発電に供する反応ガスを流すためのガス流路を形成する流路形成部材であって、多孔体からなる流路形成部材と、
前記膜電極ガス拡散層接合体、および、前記流路形成部材を挟持する一対のセパレータと、
前記一対のセパレータの間における前記膜電極ガス拡散層接合体の周囲に形成されたシール材であって、流動性を有する液状シール材を硬化することによって形成されたシール材と、
前記シール材と前記流路形成部材との間に配置され、前記シール材を形成する際に、前記液状シール材の前記流路形成部材への流入を防止するためのシーリングプレートと、
を備え、
前記セパレータは、前記セパレータの厚さ方向に貫通する排出用貫通孔であって、前記流路形成部材から排出された排出ガスを前記燃料電池セルの外部に排出するための排出用貫通孔を備えており、
前記シール材は、前記一対のセパレータの間における前記排出用貫通孔の周囲に形成されており、
前記燃料電池セルの製造方法は、
半硬化状態の半硬化シール材を配置する工程と、
前記流路形成部材、および、前記シーリングプレートが、前記排出用貫通孔内に張り出すように、一方の前記セパレータに、前記半硬化シール材と、前記膜電極ガス拡散層接合体と、前記シーリングプレートと、前記流路形成部材と、他方の前記セパレータと、を積層する積層工程と、
前記半硬化シール材を硬化して前記シール材を形成するシール材形成工程と、
を備える燃料電池セルの製造方法。 [Application Example 11]
A method for producing a fuel cell, comprising:
The fuel battery cell is
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, the sealing material formed by curing a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator includes a discharge through hole penetrating in the thickness direction of the separator, and the discharge through hole for discharging the exhaust gas discharged from the flow path forming member to the outside of the fuel cell. And
The sealing material is formed around the discharge through hole between the pair of separators,
The fuel cell manufacturing method includes
A step of arranging a semi-cured sealing material in a semi-cured state;
One of the separators, the semi-cured sealing material, the membrane electrode gas diffusion layer assembly, and the sealing so that the flow path forming member and the sealing plate protrude into the discharge through hole. A laminating step of laminating a plate, the flow path forming member, and the other separator;
A sealing material forming step of curing the semi-cured sealing material to form the sealing material;
A method for producing a fuel cell comprising:

［適用例１２］
燃料電池セルの製造方法であって、
前記燃料電池セルは、
電解質膜の両面に電極を接合してなる膜電極接合体と、前記膜電極接合体の表面に接合されたガス拡散層と、を有する膜電極ガス拡散層接合体と、
前記ガス拡散層の表面に積層され、前記ガス拡散層の表面に沿って発電に供する反応ガスを流すためのガス流路を形成する流路形成部材であって、多孔体からなる流路形成部材と、
前記膜電極ガス拡散層接合体、および、前記流路形成部材を挟持する一対のセパレータと、
前記一対のセパレータの間における前記膜電極ガス拡散層接合体の周囲に形成されたシール材であって、流動性を有する液状シール材を熱硬化することによって形成されたシール材と、
前記シール材と前記流路形成部材との間に配置され、前記シール材を形成する際に、前記液状シール材の前記流路形成部材への流入を防止するためのシーリングプレートと、
を備え、
前記セパレータは、前記セパレータの厚さ方向に貫通する排出用貫通孔であって、前記流路形成部材から排出された排出ガスを前記燃料電池セルの外部に排出するための排出用貫通孔を備えており、
前記シール材は、前記一対のセパレータの間における前記排出用貫通孔の周囲に形成されており、
前記燃料電池セルの製造方法は、
前記流路形成部材、および、前記シーリングプレートが、前記排出用貫通孔内に張り出すように、一方の前記セパレータに、前記膜電極ガス拡散層接合体と、前記シーリングプレートと、前記流路形成部材と、他方の前記セパレータと、を積層する積層工程と、
前記一方のセパレータと前記他方のセパレータとの間に、前記液状シール材を注入する注入工程と、
前記液状シール材を熱硬化して前記シール材を形成するシール材形成工程と、
を備える燃料電池セルの製造方法。 [Application Example 12]
A method for producing a fuel cell, comprising:
The fuel battery cell is
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, wherein the sealing material is formed by thermosetting a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator includes a discharge through hole penetrating in the thickness direction of the separator, and the discharge through hole for discharging the exhaust gas discharged from the flow path forming member to the outside of the fuel cell. And
The sealing material is formed around the discharge through hole between the pair of separators,
The fuel cell manufacturing method includes
One of the separators, the membrane electrode gas diffusion layer assembly, the sealing plate, and the flow path formation so that the flow path forming member and the sealing plate project into the discharge through hole. A laminating step of laminating the member and the other separator;
An injection step of injecting the liquid sealing material between the one separator and the other separator;
A sealing material forming step of thermosetting the liquid sealing material to form the sealing material;
A method for producing a fuel cell comprising:

適用例１０ないし１２の燃料電池セルの製造方法によって、適用例４の燃料電池セルを製造することができる。なお、適用例１２の燃料電池セルの製造方法において、注入工程には、例えば、インジェクション成型等を用いた射出成型等が適用される。 The fuel cell of Application Example 4 can be manufactured by the manufacturing method of the fuel cell of Application Examples 10 to 12. In the fuel cell manufacturing method of Application Example 12, for example, injection molding using injection molding or the like is applied to the injection process.

［適用例１３］
適用例７ないし１２のいずれかに記載の燃料電池セルの製造方法であって、
前記シーリングプレートは、前記流路形成部材に予め接合されている、
燃料電池セルの製造方法。 [Application Example 13]
A method for producing a fuel cell according to any one of Application Examples 7 to 12,
The sealing plate is joined in advance to the flow path forming member.
Manufacturing method of fuel cell.

適用例１３の燃料電池セルの製造方法によって、上記積層工程を、シーリングプレートが、流路形成部材に予め接合されていない場合よりも、簡略化することができる。 According to the fuel cell manufacturing method of the application example 13, the stacking process can be simplified as compared with the case where the sealing plate is not previously joined to the flow path forming member.

なお、適用例７ないし１３の燃料電池セルの製造法においても、先に適用例２ないし６の燃料電池セルについて示した種々の付加的要素を適用することが可能である。 In addition, in the manufacturing methods of the fuel cells of application examples 7 to 13, it is possible to apply the various additional elements previously shown for the fuel cells of application examples 2 to 6.

本発明の第１実施例としての燃料電池セル１００の概略構成を示す説明図である。It is explanatory drawing which shows schematic structure of the fuel cell 100 as 1st Example of this invention. 第１実施例の燃料電池セル１００の製造工程を示す説明図である。It is explanatory drawing which shows the manufacturing process of the fuel cell 100 of 1st Example. 第２実施例の燃料電池セル１００の製造工程を示す説明図である。It is explanatory drawing which shows the manufacturing process of the fuel cell 100 of 2nd Example. 第３実施例の燃料電池セル１００の製造工程を示す説明図である。It is explanatory drawing which shows the manufacturing process of the fuel cell 100 of 3rd Example. 変形例１としての燃料電池セル１００Ａの概略構成を示す説明図である。It is explanatory drawing which shows schematic structure of the fuel battery cell 100A as the modification 1. FIG. 変形例２としての燃料電池セル１００Ｂの概略構成を示す説明図である。10 is an explanatory diagram showing a schematic configuration of a fuel battery cell 100B as a second modification. 変形例としてのシーリングプレート４０を示す説明図である。It is explanatory drawing which shows the sealing plate 40 as a modification.

以下、本発明の実施の形態について、実施例に基づき以下の順序で説明する。
Ａ．第１実施例：
Ａ１．燃料電池セルの構成：
図１は、本発明の第１実施例としての燃料電池セル１００の概略構成を示す説明図である。図１（ａ）に、燃料電池セル１００の平面図を示した。また、図１（ｂ）に、図１（ａ）における空気導入用貫通孔３２ｉ近傍を拡大して示した。また、図１（ｃ）に、図１（ａ）におけるＢ−Ｂ断面図を示した。この燃料電池セル１００を複数積層することによって、燃料電池スタックを構成する。 Hereinafter, embodiments of the present invention will be described in the following order based on examples.
A. First embodiment:
A1. Fuel cell configuration:
FIG. 1 is an explanatory diagram showing a schematic configuration of a fuel cell 100 as a first embodiment of the present invention. FIG. 1A shows a plan view of the fuel battery cell 100. FIG. 1B shows an enlarged view of the vicinity of the air introduction through-hole 32i in FIG. FIG. 1C is a cross-sectional view taken along the line BB in FIG. A fuel cell stack is configured by stacking a plurality of the fuel cells 100.

図示するように、燃料電池セル１００は、膜電極ガス拡散層接合体１０と、流路形成部材２０ａ，２０ｃと、セパレータ３０ａ，３０ｃと、シーリングプレート４０と、シール材５０と、を備えている。以下、セパレータ３０ａ，３０ｃを総称して、セパレータ３０とも言う。 As illustrated, the fuel cell 100 includes a membrane electrode gas diffusion layer assembly 10, flow path forming members 20 a and 20 c, separators 30 a and 30 c, a sealing plate 40, and a sealing material 50. . Hereinafter, the separators 30a and 30c are also collectively referred to as the separator 30.

膜電極ガス拡散層接合体１０は、膜電極接合体１０ｍの両面にガス拡散層１０ａ，１０ｃを接合してなる。膜電極接合体１０ｍは、電解質膜の両面に電極（アノード、および、カソード）を接合してなる。本実施例では、電解質膜として、ナフィオン（登録商標）を用いるものとした。電解質膜として、プロトン伝導性を有する他の固体高分子膜を用いるものとしてもよい。また、本実施例では、ガス拡散層１０ａ，１０ｃとして、カーボンクロスを用いるものとした。ガス拡散層１０ａ，１０ｃとして、カーボンペーパー等、導電性およびガス透過性を有する他の部材と用いるものとしてもよい。なお、本実施例では、膜電極ガス拡散層接合体１０において、アノード側のガス拡散層１０ａの大きさは、カソード側のガス拡散層１０ｃの大きさよりも大きいものとした。膜電極ガス拡散層接合体１０は、図１（ａ），（ｃ）に示したように、燃料電池セル１００の中央部に配置される。 The membrane electrode gas diffusion layer assembly 10 is formed by bonding gas diffusion layers 10a and 10c to both surfaces of a membrane electrode assembly 10m. The membrane electrode assembly 10m is formed by joining electrodes (anode and cathode) to both surfaces of an electrolyte membrane. In this embodiment, Nafion (registered trademark) is used as the electrolyte membrane. As the electrolyte membrane, another solid polymer membrane having proton conductivity may be used. In this embodiment, carbon cloth is used as the gas diffusion layers 10a and 10c. The gas diffusion layers 10a and 10c may be used with other members having conductivity and gas permeability such as carbon paper. In this embodiment, in the membrane electrode gas diffusion layer assembly 10, the size of the anode side gas diffusion layer 10a is larger than the size of the cathode side gas diffusion layer 10c. The membrane electrode gas diffusion layer assembly 10 is disposed at the center of the fuel cell 100 as shown in FIGS.

流路形成部材２０ａは、膜電極ガス拡散層接合体１０におけるアノード側のガス拡散層１０ａの表面に積層される。流路形成部材２０ａは、多孔体からなり、アノード側のガス拡散層１０ａの表面に沿って燃料ガスとしての水素を流すためのガス流路を形成する。また、流路形成部材２０ｃは、膜電極ガス拡散層接合体１０におけるカソード側のガス拡散層１０ｃの表面に積層される。流路形成部材２０ｃは、流路形成部材２０ａと同様に多孔体からなり、カソード側のガス拡散層１０ｃの表面に沿って酸化剤ガスとしての空気を流すためのガス流路を形成する。本実施例では、流路形成部材２０ａ，２０ｃとして、発泡金属焼結体を用いるものとした。流路形成部材２０ａ，２０ｃとして、エキスパンドメタル等、導電性を有する他の多孔体を用いるものとしてもよい。 The flow path forming member 20 a is laminated on the surface of the anode-side gas diffusion layer 10 a in the membrane electrode gas diffusion layer assembly 10. The flow path forming member 20a is made of a porous material, and forms a gas flow path for flowing hydrogen as fuel gas along the surface of the gas diffusion layer 10a on the anode side. Further, the flow path forming member 20 c is laminated on the surface of the gas diffusion layer 10 c on the cathode side in the membrane electrode gas diffusion layer assembly 10. The flow path forming member 20c is made of a porous material like the flow path forming member 20a, and forms a gas flow path for flowing air as an oxidant gas along the surface of the gas diffusion layer 10c on the cathode side. In this embodiment, the metal foam sintered body is used as the flow path forming members 20a and 20c. As the flow path forming members 20a and 20c, other conductive porous materials such as expanded metal may be used.

セパレータ３０ａは、流路形成部材２０ａの表面に積層される。また、セパレータ３０ｃは、流路形成部材２０ｃの表面に積層される。本実施例では、セパレータ３０として、金属プレートを用いるものとした。セパレータ３０として、ガス不透過で導電性を有する他の部材を用いるものとしてもよい。 The separator 30a is laminated on the surface of the flow path forming member 20a. The separator 30c is laminated on the surface of the flow path forming member 20c. In this embodiment, a metal plate is used as the separator 30. As the separator 30, another member that is gas-impermeable and has conductivity may be used.

図１（ａ）に示したように、セパレータ３０は、矩形の外形形状を有している。そして、セパレータ３０には、セパレータ３０の厚さ方向に貫通する複数の貫通孔が形成されている。すなわち、セパレータ３０には、燃料電池セル１００の外部から供給された空気を流路形成部材２０ｃに導入するための複数の空気導入用貫通孔３２ｉが、一方の長辺（図示した下辺）に沿って形成されている。また、セパレータ３０には、流路形成部材２０ｃから排出されたカソードオフガスを燃料電池セル１００の外部に排出するための複数のカソードオフガス排出用貫通孔３２ｏが、他方の長辺（図示した上辺）に沿って形成されている。また、セパレータ３０には、燃料電池セル１００の外部から供給された水素を流路形成部材２０ａに導入するための水素導入用貫通孔３４ｉと、燃料電池セル１００の外部から供給された冷却水を冷却水流路に導入するための複数の冷却水導入用貫通孔３６ｉとが、一方の短辺（図示した左辺）に沿って形成されている。また、セパレータ３０には、流路形成部材２０ａから排出されたアノードオフガスを燃料電池セル１００の外部に排出するためのアノードオフガス排出用貫通孔３４ｏと、冷却水流路から排出された冷却水を燃料電池セル１００の外部に排出するための複数の冷却水排出用貫通孔３６ｏとが、他方の短辺（図示した右辺）に沿って形成されている。本実施例では、上述した各貫通孔は、矩形形状を有するものとした。そして、各貫通孔の周囲には、セパレータ３０（セパレータ３０ｃ）の表面にゴム製のガスケット６０を配置することによって（図１（ｃ）参照）、図１（ａ）に示したように、シールラインＳＬが形成されている。 As shown in FIG. 1A, the separator 30 has a rectangular outer shape. The separator 30 is formed with a plurality of through holes penetrating in the thickness direction of the separator 30. That is, the separator 30 has a plurality of air introduction through holes 32i for introducing air supplied from the outside of the fuel cell 100 into the flow path forming member 20c along one long side (the lower side shown in the drawing). Is formed. The separator 30 has a plurality of cathode offgas discharge through holes 32o for discharging the cathode offgas discharged from the flow path forming member 20c to the outside of the fuel cell 100, and the other long side (the upper side shown in the drawing). It is formed along. In addition, the separator 30 is provided with a hydrogen introduction through hole 34i for introducing hydrogen supplied from the outside of the fuel cell 100 into the flow path forming member 20a, and cooling water supplied from the outside of the fuel cell 100. A plurality of cooling water introduction through holes 36i for introduction into the cooling water flow path are formed along one short side (the left side in the drawing). In addition, the separator 30 has anode through gas discharge through holes 34o for discharging the anode off gas discharged from the flow path forming member 20a to the outside of the fuel cell 100, and cooling water discharged from the cooling water flow path as fuel. A plurality of cooling water discharge through holes 36o for discharging to the outside of the battery cell 100 are formed along the other short side (right side shown in the figure). In the present embodiment, each through hole described above has a rectangular shape. Then, a rubber gasket 60 is disposed on the surface of the separator 30 (separator 30c) around each through hole (see FIG. 1C), as shown in FIG. 1A. A line SL is formed.

シール材５０は、セパレータ３０ａとセパレータ３０ｃとの間における膜電極ガス拡散層接合体１０の外周部、および、セパレータ３０ａとセパレータ３０ｃとの間における各貫通孔の周囲に形成されている。このシール材５０は、流動性を有する液状シール材（例えば、液状ゴム）を硬化することによって形成される。流動性を有する液状シール材としては、熱硬化前には常に流動性を有する熱硬化性のシール材や、加熱時に粘度が低下して流動性を発現する熱可塑性の半硬化状態のシール材が用いられる。このため、シール材５０と流路形成部材２０ｃとの間には、シール材５０を形成する際に、液状シール材の流路形成部材２０ｃへの流入を防止するためのシーリングプレート４０が配置されている。本実施例では、シーリングプレート４０として、チタンプレートを用いるものとした。 The sealing material 50 is formed around the outer periphery of the membrane electrode gas diffusion layer assembly 10 between the separator 30a and the separator 30c and around each through hole between the separator 30a and the separator 30c. The sealing material 50 is formed by curing a liquid sealing material having fluidity (for example, liquid rubber). The liquid sealing material having fluidity includes a thermosetting sealing material that always has fluidity before thermosetting, and a thermoplastic semi-cured sealing material that exhibits fluidity by decreasing its viscosity when heated. Used. Therefore, a sealing plate 40 is disposed between the sealing material 50 and the flow path forming member 20c to prevent the liquid sealing material from flowing into the flow path forming member 20c when the sealing material 50 is formed. ing. In this embodiment, a titanium plate is used as the sealing plate 40.

なお、本実施例では、流路形成部材２０ａの大きさは、膜電極ガス拡散層接合体１０におけるアノード側のガス拡散層１０ａの大きさとほぼ同じであるものとした。また、流路形成部材２０ｃの大きさは、膜電極ガス拡散層接合体１０におけるカソード側のガス拡散層１０ｃの大きさよりも大きいものとした。具体的には、流路形成部材２０ｃの長辺の長さは、膜電極ガス拡散層接合体１０におけるカソード側のガス拡散層１０ｃの長辺の長さとほぼ同じであり、流路形成部材２０ｃの短辺方向の長さは、セパレータ３０における空気導入用貫通孔３２ｉとカソードオフガス排出用貫通孔３２ｏとの間隔よりも長い。 In the present embodiment, the size of the flow path forming member 20a is substantially the same as the size of the gas diffusion layer 10a on the anode side in the membrane electrode gas diffusion layer assembly 10. The size of the flow path forming member 20c is larger than the size of the gas diffusion layer 10c on the cathode side in the membrane electrode gas diffusion layer assembly 10. Specifically, the length of the long side of the flow path forming member 20c is substantially the same as the length of the long side of the gas diffusion layer 10c on the cathode side in the membrane electrode gas diffusion layer assembly 10, and the flow path forming member 20c. The length in the short side direction is longer than the distance between the air introduction through hole 32i and the cathode offgas discharge through hole 32o in the separator 30.

そして、図１（ａ）〜（ｃ）に示したように、流路形成部材２０ｃは、セパレータ３０の厚さ方向から見たときに、セパレータ３０における長辺に沿った幅方向全体にわたって、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内に張り出すように形成されている。また、シーリングプレート４０も、セパレータ３０の厚さ方向から見たときに、セパレータ３０における長辺に沿った幅方向全体にわたって、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内に張り出すように形成されている。さらに、本実施例では、シーリングプレート４０は、セパレータ３０の厚さ方向から見たときに、セパレータ３０における長辺に沿った幅方向全体にわたって、流路形成部材２０ｃよりも、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内に張り出すように形成されている。 As shown in FIGS. 1A to 1C, the flow path forming member 20 c is air over the entire width direction along the long side of the separator 30 when viewed from the thickness direction of the separator 30. It is formed so as to protrude into the introduction through hole 32i and the cathode off gas discharge through hole 32o. In addition, the sealing plate 40 is also formed in the air introduction through hole 32i and the cathode offgas discharge through hole 32o over the entire width direction along the long side of the separator 30 when viewed from the thickness direction of the separator 30. It is formed to overhang. Further, in the present embodiment, the sealing plate 40 has a through hole for introducing air more than the flow path forming member 20c over the entire width direction along the long side of the separator 30 when viewed from the thickness direction of the separator 30. It is formed so as to project into the 32i and the cathode offgas discharge through hole 32o.

また、本実施例では、図１（ａ），（ｂ）に示したように、シーリングプレート４０は、空気導入用貫通孔３２ｉの輪郭線と流路形成部材２０ｃの外周輪郭線との交点Ｐから空気導入用貫通孔３２ｉ内に張り出すように形成された凸部４２を備えている。また、シーリングプレート４０は、カソードオフガス排出用貫通孔３２ｏの輪郭線と流路形成部材２０ｃとの外周輪郭線との交点からカソードオフガス排出用貫通孔３２ｏ内に張り出すように形成された凸部４２を備えている。本実施例では、凸部４２の形状は、台形であるものとした。 In this embodiment, as shown in FIGS. 1A and 1B, the sealing plate 40 has an intersection P between the contour line of the air introduction through hole 32i and the outer peripheral contour line of the flow path forming member 20c. The projection 42 is formed so as to protrude from the through hole 32i for introducing air. Further, the sealing plate 40 is a convex portion formed so as to protrude into the cathode offgas discharge through hole 32o from the intersection of the contour line of the cathode offgas discharge through hole 32o and the outer peripheral contour line of the flow path forming member 20c. 42 is provided. In this embodiment, the convex portion 42 has a trapezoidal shape.

上述した燃料電池セル１００は、以下に説明する製造工程によって製造することができる。 The fuel cell 100 described above can be manufactured by the manufacturing process described below.

Ａ２．燃料電池セルの製造工程：
図２は、第１実施例の燃料電池セル１００の製造工程を示す説明図である。まず、セパレータ３０ａの表面の、膜電極ガス拡散層接合体１０の外周部に対応する部位、および、各貫通孔の周囲に、液状シール材を塗布する（ステップＳ１００）。次に、セパレータ３０ａに、膜電極ガス拡散層接合体１０と、シーリングプレート４０と、流路形成部材２０ａ，２０ｃと、セパレータ３０ｃと、を積層する（ステップＳ１１０）。このとき、流路形成部材２０ｃ、および、シーリングプレート４０が、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏに張り出すように積層する。なお、本実施例では、シーリングプレート４０は、流路形成部材２０ｃに予め接合されているものとした。そして、液状シール材をセパレータ３０ａ，３０ｃで挟んで加圧し、液状シール材を熱硬化して、シール材５０を形成する（ステップＳ１２０）。以上の製造工程によって、第１実施例の燃料電池セル１００は製造される。 A2. Fuel cell manufacturing process:
FIG. 2 is an explanatory view showing a manufacturing process of the fuel cell 100 of the first embodiment. First, a liquid sealing material is applied to a portion of the surface of the separator 30a corresponding to the outer peripheral portion of the membrane electrode gas diffusion layer assembly 10 and around each through hole (step S100). Next, the membrane electrode gas diffusion layer assembly 10, the sealing plate 40, the flow path forming members 20a and 20c, and the separator 30c are stacked on the separator 30a (step S110). At this time, the flow path forming member 20c and the sealing plate 40 are laminated so as to protrude into the air introduction through hole 32i and the cathode off gas discharge through hole 32o. In the present embodiment, the sealing plate 40 is joined in advance to the flow path forming member 20c. Then, the liquid sealing material is sandwiched between the separators 30a and 30c and pressurized, and the liquid sealing material is thermally cured to form the sealing material 50 (step S120). The fuel cell 100 of the first embodiment is manufactured by the above manufacturing process.

以上説明した第１実施例の燃料電池セル１００では、セパレータ３０の厚さ方向から見たときに、流路形成部材２０ｃ、および、シーリングプレート４０が、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内に張り出すように形成されている。さらに、シーリングプレート４０は、セパレータ３０の厚さ方向から見たときに、流路形成部材２０ｃよりも、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内に張り出すように形成されている。このため、燃料電池セル１００の製造時に、すなわち、液状シール材を加圧して熱硬化し、シール材５０を形成する際に、液状シール材が加圧によって押し広げられても、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内において、液状シール材の回り込みを抑制することができる。したがって、流路形成部材２０ｃに液状シール材が流れ込むことを抑制することができる。 In the fuel cell 100 of the first embodiment described above, when viewed from the thickness direction of the separator 30, the flow path forming member 20c and the sealing plate 40 are disposed in the air introduction through hole 32i and the cathode. It is formed so as to project into the off-gas discharge through hole 32o. Further, when viewed from the thickness direction of the separator 30, the sealing plate 40 protrudes from the flow path forming member 20 c into the air introduction through hole 32 i and the cathode offgas discharge through hole 32 o. Is formed. Therefore, when the fuel cell 100 is manufactured, that is, when the liquid sealing material is pressurized and thermally cured to form the sealing material 50, the air introduction penetrating even if the liquid sealing material is expanded by the pressure. The wraparound of the liquid sealing material can be suppressed in the hole 32i and the cathode offgas discharge through hole 32o. Therefore, the liquid sealing material can be prevented from flowing into the flow path forming member 20c.

また、第１実施例の燃料電池セル１００では、シーリングプレート４０は、凸部４２を備えている。すなわち、シーリングプレート４０は、セパレータ３０の厚さ方向から見たときに、空気導入用貫通孔３２ｉの輪郭線と流路形成部材２０ｃの外周輪郭線との交点から、空気導入用貫通孔３２ｉ内に張り出すように形成されている。また、シーリングプレート４０は、セパレータ３０の厚さ方向から見たときに、カソードオフガス排出用貫通孔３２ｏの輪郭線と流路形成部材２０ｃの外周輪郭線との交点から、カソードオフガス排出用貫通孔３２ｏ内に張り出すように形成されている。したがって、空気導入用貫通孔３２ｉの輪郭線と流路形成部材２０ｃの外周輪郭線との交点からの液状シール材の回り込み、および、カソードオフガス排出用貫通孔３２ｏの輪郭線と流路形成部材２０ｃの外周輪郭線との交点からの液状シール材の回り込みを抑制することができる。 Further, in the fuel cell 100 of the first embodiment, the sealing plate 40 includes a convex portion 42. That is, when viewed from the thickness direction of the separator 30, the sealing plate 40 is located in the air introduction through hole 32 i from the intersection of the outline of the air introduction through hole 32 i and the outer periphery outline of the flow path forming member 20 c. It is formed to overhang. Further, when viewed from the thickness direction of the separator 30, the sealing plate 40 has a cathode offgas discharge through hole from the intersection of the contour line of the cathode offgas discharge through hole 32 o and the outer peripheral contour line of the flow path forming member 20 c. It is formed so as to overhang in 32o. Accordingly, the liquid sealing material wraps around from the intersection of the contour line of the air introduction through hole 32i and the outer peripheral contour line of the flow path forming member 20c, and the contour line of the cathode offgas discharge through hole 32o and the flow path forming member 20c. It is possible to suppress the wraparound of the liquid sealing material from the intersection with the outer peripheral contour line.

また、第１実施例の燃料電池セル１００の製造工程では、シーリングプレート４０は、流路形成部材２０ｃに予め接合されている。したがって、図２に示したステップＳ１１０において、セパレータ３０ａに、膜電極ガス拡散層接合体１０と、シーリングプレート４０と、流路形成部材２０ａ，２０ｃと、セパレータ３０ｃと、を積層する積層工程を、シーリングプレート４０が、流路形成部材２０ｃに予め接合されていない場合よりも、簡略化することができる。 Further, in the manufacturing process of the fuel cell 100 of the first embodiment, the sealing plate 40 is joined to the flow path forming member 20c in advance. Therefore, in step S110 shown in FIG. 2, a laminating step of laminating the membrane electrode gas diffusion layer assembly 10, the sealing plate 40, the flow path forming members 20a and 20c, and the separator 30c on the separator 30a, The sealing plate 40 can be simplified as compared with the case where the sealing plate 40 is not previously joined to the flow path forming member 20c.

Ｂ．第２実施例：
第２実施例の燃料電池セル１００の構成は、第１実施例の燃料電池セル１００の構成と同じである。第２実施例と第１実施例とでは、燃料電池セル１００の製造工程が異なっている。以下、第２実施例の燃料電池セル１００の製造工程について説明する。 B. Second embodiment:
The configuration of the fuel cell 100 of the second embodiment is the same as the configuration of the fuel cell 100 of the first embodiment. The manufacturing process of the fuel cell 100 is different between the second embodiment and the first embodiment. Hereinafter, the manufacturing process of the fuel cell 100 of the second embodiment will be described.

図３は、第２実施例の燃料電池セル１００の製造工程を示す説明図である。まず、熱可塑性の半硬化状態の半硬化シール材を準備する（ステップＳ２００）。次に、セパレータ３０ａに、半硬化シール材と、膜電極ガス拡散層接合体１０と、シーリングプレート４０と、流路形成部材２０ａ，２０ｃと、セパレータ３０ｃと、を積層する（ステップＳ２１０）。このとき、流路形成部材２０ｃ、および、シーリングプレート４０が、セパレータ３０の厚さ方向から見たときに、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏに張り出すように積層する。本実施例においても、シーリングプレート４０は、流路形成部材２０ｃに予め接合されているものとした。そして、半硬化シール材をセパレータ３０ａ，３０ｃで挟んで加圧し、半硬化シール材を熱硬化して、シール材５０を形成する（ステップＳ２２０）。なお、半硬化シール材は、熱硬化の過程で粘度が低下して流動性を発現する。以上の製造工程によって、第２実施例の燃料電池セル１００は製造される。 FIG. 3 is an explanatory view showing a manufacturing process of the fuel cell 100 of the second embodiment. First, a thermoplastic semi-cured semi-cured sealing material is prepared (step S200). Next, the semi-cured sealing material, the membrane electrode gas diffusion layer assembly 10, the sealing plate 40, the flow path forming members 20a and 20c, and the separator 30c are stacked on the separator 30a (step S210). At this time, the flow path forming member 20c and the sealing plate 40 protrude into the air introduction through-hole 32i and the cathode off-gas discharge through-hole 32o when viewed from the thickness direction of the separator 30. Laminate. Also in the present embodiment, the sealing plate 40 is joined in advance to the flow path forming member 20c. Then, the semi-cured sealing material is sandwiched between the separators 30a and 30c and pressurized, and the semi-cured sealing material is thermally cured to form the sealing material 50 (step S220). In addition, a semi-hardened sealing material expresses fluidity by decreasing the viscosity in the process of thermosetting. The fuel cell 100 of the second embodiment is manufactured by the above manufacturing process.

以上説明した第２実施例の燃料電池セル１００によっても、第１実施例の燃料電池セル１００と同様に、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内において、流路形成部材２０ｃに液状シール材が流れ込むことを抑制することができる。 Also in the fuel cell 100 of the second embodiment described above, in the same way as the fuel cell 100 of the first embodiment, the flow path is formed in the air introduction through hole 32i and the cathode offgas discharge through hole 32o. The liquid sealing material can be prevented from flowing into the forming member 20c.

Ｃ．第３実施例：
第３実施例の燃料電池セル１００の構成は、第１，２実施例の燃料電池セル１００の構成と同じである。第３実施例と第１，２実施例とでは、燃料電池セル１００の製造工程が異なっている。以下、第３実施例の燃料電池セル１００の製造工程について説明する。 C. Third embodiment:
The configuration of the fuel cell 100 of the third embodiment is the same as the configuration of the fuel cell 100 of the first and second embodiments. The third embodiment differs from the first and second embodiments in the manufacturing process of the fuel cell 100. Hereinafter, the manufacturing process of the fuel cell 100 of the third embodiment will be described.

図４は、第３実施例の燃料電池セル１００の製造工程を示す説明図である。まず、セパレータ３０ａに、膜電極ガス拡散層接合体１０と、シーリングプレート４０と、流路形成部材２０ａ，２０ｃと、セパレータ３０ｃと、を積層する（ステップＳ３００）。このとき、流路形成部材２０ｃ、および、シーリングプレート４０が、セパレータ３０の厚さ方向から見たときに、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏに張り出すように積層する。本実施例においても、シーリングプレート４０は、流路形成部材２０ｃに予め接合されているものとした。次に、セパレータ３０ａとセパレータ３０ｃとの間に、液状シール材を注入する（ステップＳ３１０）。この液状シール材の注入には、例えば、インジェクション成型等を用いた射出成型等が適用される。そして、液状シール材をセパレータ３０ａ，３０ｃで挟んで加圧し、液状シール材を熱硬化して、シール材５０を形成する（ステップＳ３２０）。以上の製造工程によって、第３実施例の燃料電池セル１００は製造される。 FIG. 4 is an explanatory view showing a manufacturing process of the fuel cell 100 of the third embodiment. First, the membrane electrode gas diffusion layer assembly 10, the sealing plate 40, the flow path forming members 20a and 20c, and the separator 30c are stacked on the separator 30a (step S300). At this time, the flow path forming member 20c and the sealing plate 40 protrude into the air introduction through-hole 32i and the cathode off-gas discharge through-hole 32o when viewed from the thickness direction of the separator 30. Laminate. Also in the present embodiment, the sealing plate 40 is joined in advance to the flow path forming member 20c. Next, a liquid sealing material is injected between the separator 30a and the separator 30c (step S310). For injection of the liquid sealing material, for example, injection molding using injection molding or the like is applied. Then, the liquid sealing material is sandwiched between the separators 30a and 30c and pressurized, and the liquid sealing material is thermoset to form the sealing material 50 (step S320). The fuel cell 100 of the third embodiment is manufactured by the above manufacturing process.

以上説明した第３実施例の燃料電池セル１００によっても、第１，２実施例の燃料電池セル１００と同様に、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内において、流路形成部材２０ｃに液状シール材が流れ込むことを抑制することができる。 In the fuel cell 100 of the third embodiment described above, similarly to the fuel cell 100 of the first and second embodiments, in the air introduction through hole 32i and the cathode offgas discharge through hole 32o, The liquid sealing material can be prevented from flowing into the flow path forming member 20c.

Ｄ．変形例：
以上、本発明のいくつかの実施の形態について説明したが、本発明はこのような実施の形態になんら限定されるものではなく、その要旨を逸脱しない範囲内において種々なる態様での実施が可能である。例えば、以下のような変形が可能である。 D. Variations:
As mentioned above, although several embodiment of this invention was described, this invention is not limited to such embodiment at all, and implementation in various aspects is possible within the range which does not deviate from the summary. It is. For example, the following modifications are possible.

Ｄ１．変形例１：
上記実施例の燃料電池セル１００では、シーリングプレート４０は、凸部４２を備えるものとしたが、本発明は、これに限られない。シーリングプレート４０は、凸部４２を備えないものとしてもよい。また、空気導入用貫通孔３２ｉ側に配置されるシーリングプレート４０、および、カソードオフガス排出用貫通孔３２ｏ側に配置されるシーリングプレート４０のいずれか一方が凸部４２を備えるものとしてもよい。 D1. Modification 1:
In the fuel cell 100 of the above embodiment, the sealing plate 40 includes the convex portion 42, but the present invention is not limited to this. The sealing plate 40 may not include the convex portion 42. Further, any one of the sealing plate 40 arranged on the air introduction through hole 32i side and the sealing plate 40 arranged on the cathode offgas discharge through hole 32o side may be provided with a convex portion 42.

図５は、変形例１としての燃料電池セル１００Ａの概略構成を示す説明図である。この燃料電池セル１００Ａは、燃料電池セル１００におけるシーリングプレート４０の代わりに、シーリングプレート４０Ａを備えている。そして、シーリングプレート４０Ａは、シーリングプレート４０における凸部４２を備えていない。こうすることによっても、液状シール材の回りこみを抑制し、流路形成部材２０ｃに液状シール材が流れ込むことを抑制することができる。ただし、燃料電池セル１００Ａよりも燃料電池セル１００の方が液状シール材の回り込みを抑制することができる。 FIG. 5 is an explanatory diagram showing a schematic configuration of a fuel battery cell 100A as the first modification. The fuel battery cell 100A includes a sealing plate 40A instead of the sealing plate 40 in the fuel battery cell 100. The sealing plate 40A does not include the convex portion 42 in the sealing plate 40. Also by doing so, it is possible to suppress wraparound of the liquid sealing material and to prevent the liquid sealing material from flowing into the flow path forming member 20c. However, the fuel cell 100 can suppress the wraparound of the liquid sealing material than the fuel cell 100A.

Ｄ２．変形例２：
上記実施例の燃料電池セル１００では、シーリングプレート４０は、セパレータ３０の厚さ方向から見たときに、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内に張り出し、さらに、流路形成部材２０ｃよりも、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内に張り出しているものとしたが、本発明は、これに限られない。シーリングプレート４０は、セパレータ３０の厚さ方向から見たときに、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内に張り出し、流路形成部材２０ｃからは、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内に張り出さないものとしてもよい。 D2. Modification 2:
In the fuel cell 100 of the above embodiment, the sealing plate 40 protrudes into the air introduction through hole 32i and the cathode offgas discharge through hole 32o when viewed from the thickness direction of the separator 30, Although it is assumed that it protrudes into the air introduction through-hole 32i and the cathode off-gas discharge through-hole 32o rather than the flow path forming member 20c, the present invention is not limited to this. When viewed from the thickness direction of the separator 30, the sealing plate 40 projects into the air introduction through hole 32 i and the cathode offgas discharge through hole 32 o, and from the flow path forming member 20 c, the air introduction through hole It is good also as what does not protrude in the hole 32i and the through-hole 32o for cathode offgas discharge | emission.

図６は、変形例２としての燃料電池セル１００Ｂの概略構成を示す説明図である。この燃料電池セル１００Ｂは、燃料電池セル１００におけるシーリングプレート４０の代わりに、シーリングプレート４０Ｂを備えている。そして、シーリングプレート４０Ｂは、セパレータ３０の厚さ方向から見たときに、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内には張り出すものの、流路形成部材２０ｃからは、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内には張り出さない。こうすることによっても、液状シール材の回りこみを抑制し、流路形成部材２０ｃに液状シール材が流れ込むことを抑制することができる。ただし、燃料電池セル１００Ｂよりも燃料電池セル１００の方が液状シール材の回り込みを抑制することができる。 FIG. 6 is an explanatory diagram showing a schematic configuration of a fuel cell 100B as a second modification. The fuel cell 100B includes a sealing plate 40B instead of the sealing plate 40 in the fuel cell 100. The sealing plate 40B protrudes into the air introduction through hole 32i and the cathode offgas discharge through hole 32o when viewed from the thickness direction of the separator 30, but from the flow path forming member 20c. They do not protrude into the air introduction through hole 32i and the cathode offgas discharge through hole 32o. Also by doing so, it is possible to suppress wraparound of the liquid sealing material and to prevent the liquid sealing material from flowing into the flow path forming member 20c. However, the fuel cell 100 can suppress the wraparound of the liquid sealing material than the fuel cell 100B.

Ｄ３．変形例３：
上記実施例の燃料電池セル１００では、シーリングプレート４０が備える凸部４２の形状は、台形であるものとしたが、本発明は、これに限られない。凸部４２の形状は、適宜、変更可能である。 D3. Modification 3:
In the fuel cell 100 of the above embodiment, the shape of the convex portion 42 included in the sealing plate 40 is a trapezoid, but the present invention is not limited to this. The shape of the convex portion 42 can be changed as appropriate.

図７は、変形例としてのシーリングプレート４０を示す説明図である。図７（ａ）に示したように、シーリングプレート４０は、空気導入用貫通孔３２ｉの輪郭線近傍に扇型形状を有する凸部４２Ａを備えるものとしてもよい。また、図７（ｂ）に示したように、シーリングプレート４０は、空気導入用貫通孔３２ｉの輪郭線近傍のみをカバーする形状を有する凸部４２Ｂを備えるものとしてもよい。 FIG. 7 is an explanatory view showing a sealing plate 40 as a modified example. As shown in FIG. 7A, the sealing plate 40 may include a convex portion 42A having a fan shape in the vicinity of the outline of the air introduction through hole 32i. Further, as shown in FIG. 7B, the sealing plate 40 may include a convex portion 42B having a shape that covers only the vicinity of the contour line of the air introduction through hole 32i.

Ｄ４．変形例４：
上記実施例の燃料電池セル１００では、流路形成部材２０ｃ、および、シーリングプレート４０は、セパレータ３０の厚さ方向から見たときに、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内の双方に張り出すように形成されるものとしたが、本発明は、これに限られない。流路形成部材２０ｃ、および、シーリングプレート４０は、セパレータ３０の厚さ方向から見たときに、空気導入用貫通孔３２ｉ内、および、カソードオフガス排出用貫通孔３２ｏ内のいずれか一方に張り出すものとしてもよい。 D4. Modification 4:
In the fuel cell 100 of the above embodiment, the flow path forming member 20c and the sealing plate 40, when viewed from the thickness direction of the separator 30, are in the air introduction through-hole 32i and the cathode off-gas discharge through. Although formed so that it may protrude over both in the hole 32o, this invention is not limited to this. When viewed from the thickness direction of the separator 30, the flow path forming member 20c and the sealing plate 40 protrude into one of the air introduction through hole 32i and the cathode offgas discharge through hole 32o. It may be a thing.

Ｄ５．変形例５：
上記実施例の燃料電池セル１００では、本発明における流路形成部材、および、シーリングプレートの構成を、カソード側に適用するものとしたが、本発明は、これに限られない。本発明における流路形成部材、および、シーリングプレートの構成を、アノード側に適用するものとしてもよい。 D5. Modification 5:
In the fuel cell 100 of the above embodiment, the flow path forming member and the configuration of the sealing plate in the present invention are applied to the cathode side, but the present invention is not limited to this. The configurations of the flow path forming member and the sealing plate in the present invention may be applied to the anode side.

１００，１００Ａ，１００Ｂ…燃料電池セル
１０…膜電極ガス拡散層接合体
１０ｍ…膜電極接合体
１０ａ，１０ｃ…ガス拡散層
２０ａ，２０ｃ…流路形成部材
３０，３０ａ，３０ｃ…セパレータ
３２ｉ…空気導入用貫通孔
３２ｏ…カソードオフガス排出用貫通孔
３４ｉ…水素導入用貫通孔
３４ｏ…アノードオフガス排出用貫通孔
３６ｉ…冷却水導入用貫通孔
３６ｏ…冷却水排出用貫通孔
４０，４０Ａ，４０Ｂ…シーリングプレート
４２，４２Ａ，４２Ｂ…凸部
５０…シール材
６０…ガスケット
ＳＬ…シールライン DESCRIPTION OF SYMBOLS 100,100A, 100B ... Fuel cell 10 ... Membrane electrode gas diffusion layer assembly 10m ... Membrane electrode assembly 10a, 10c ... Gas diffusion layer 20a, 20c ... Flow path forming member 30, 30a, 30c ... Separator 32i ... Air introduction Through hole 32o ... Cathode off gas discharge through hole 34i ... Hydrogen introduction through hole 34o ... Anode off gas discharge through hole 36i ... Cooling water introduction through hole 36o ... Cooling water discharge through hole 40, 40A, 40B ... Sealing plate 42, 42A, 42B ... convex portion 50 ... sealing material 60 ... gasket SL ... seal line

Claims

A fuel cell,
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, the sealing material formed by curing a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator is an introduction through-hole penetrating in the thickness direction of the separator, the introduction through-hole for introducing the reaction gas supplied from the outside of the fuel cell into the flow path forming member. With
The sealing material is formed around the introduction through hole between the pair of separators,
The flow path forming member and the sealing plate are formed so as to protrude into the introduction through-hole when viewed from the thickness direction.
Fuel cell.

The fuel cell according to claim 1,
The sealing plate is further formed so as to protrude into the introduction through-hole rather than the flow path forming member when viewed from the thickness direction.
Fuel cell.

The fuel cell according to claim 1 or 2, wherein
The sealing plate further protrudes into the introduction through hole from the intersection of the outline of the introduction through hole and the outer periphery outline of the flow path forming member when viewed from the thickness direction. Formed in the
Fuel cell.

A fuel cell,
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, the sealing material formed by curing a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator includes a discharge through hole penetrating in the thickness direction of the separator, and the discharge through hole for discharging the exhaust gas discharged from the flow path forming member to the outside of the fuel cell. And
The sealing material is formed around the discharge through hole between the pair of separators,
The flow path forming member and the sealing plate are formed so as to protrude into the discharge through hole when viewed from the thickness direction.
Fuel cell.

The fuel cell according to claim 4,
The sealing plate is further formed so as to protrude into the discharge through-hole rather than the flow path forming member when viewed from the thickness direction.
Fuel cell.

The fuel cell according to claim 4 or 5, wherein
The sealing plate further protrudes into the discharge through hole from the intersection of the outline of the discharge through hole and the outer periphery of the flow path forming member when viewed from the thickness direction. Formed in the
Fuel cell.

A method for producing a fuel cell, comprising:
The fuel battery cell is
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, the sealing material formed by curing a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator is an introduction through-hole penetrating in the thickness direction of the separator, the introduction through-hole for introducing the reaction gas supplied from the outside of the fuel cell into the flow path forming member. With
The sealing material is formed around the introduction through hole between the pair of separators,
The fuel cell manufacturing method includes
An application step of applying the liquid sealing material to the surface of one of the separators;
The membrane electrode gas diffusion layer assembly, the sealing plate, and the flow path formation are formed on the one separator so that the flow path forming member and the sealing plate protrude into the introduction through hole. A laminating step of laminating the member and the other separator;
A sealing material forming step of thermosetting the liquid sealing material to form the sealing material;
A method for producing a fuel cell comprising:

A method for producing a fuel cell, comprising:
The fuel battery cell is
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, the sealing material formed by curing a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator is an introduction through-hole penetrating in the thickness direction of the separator, the introduction through-hole for introducing the reaction gas supplied from the outside of the fuel cell into the flow path forming member. With
The sealing material is formed around the introduction through hole between the pair of separators,
The fuel cell manufacturing method includes
A step of arranging a semi-cured sealing material in a semi-cured state;
One of the separators, the semi-cured sealing material, the membrane electrode gas diffusion layer assembly, and the sealing so that the flow path forming member and the sealing plate protrude into the introduction through hole. A laminating step of laminating a plate, the flow path forming member, and the other separator;
A sealing material forming step of curing the semi-cured sealing material to form the sealing material;
A method for producing a fuel cell comprising:

A method for producing a fuel cell, comprising:
The fuel battery cell is
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, the sealing material formed by curing a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator is an introduction through-hole penetrating in the thickness direction of the separator, the introduction through-hole for introducing the reaction gas supplied from the outside of the fuel cell into the flow path forming member. With
The sealing material is formed around the introduction through hole between the pair of separators,
The fuel cell manufacturing method includes
One of the separators, the membrane electrode gas diffusion layer assembly, the sealing plate, and the flow path formation so that the flow path forming member and the sealing plate protrude into the through hole for introduction. A laminating step of laminating the member and the other separator;
An injection step of injecting the liquid sealing material between the one separator and the other separator;
A sealing material forming step of thermosetting the liquid sealing material to form the sealing material;
A method for producing a fuel cell comprising:

A method for producing a fuel cell, comprising:
The fuel battery cell is
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, the sealing material formed by curing a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator includes a discharge through hole penetrating in the thickness direction of the separator, and the discharge through hole for discharging the exhaust gas discharged from the flow path forming member to the outside of the fuel cell. And
The sealing material is formed around the discharge through hole between the pair of separators,
The fuel cell manufacturing method includes
An application step of applying the liquid sealing material to the surface of one of the separators;
The membrane electrode gas diffusion layer assembly, the sealing plate, and the flow path formation are formed on the one separator so that the flow path forming member and the sealing plate project into the discharge through hole. A laminating step of laminating the member and the other separator;
A sealing material forming step of thermosetting the liquid sealing material to form the sealing material;
A method for producing a fuel cell comprising:

A method for producing a fuel cell, comprising:
The fuel battery cell is
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, the sealing material formed by curing a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator includes a discharge through hole penetrating in the thickness direction of the separator, and the discharge through hole for discharging the exhaust gas discharged from the flow path forming member to the outside of the fuel cell. And
The sealing material is formed around the discharge through hole between the pair of separators,
The fuel cell manufacturing method includes
A step of arranging a semi-cured sealing material in a semi-cured state;
One of the separators, the semi-cured sealing material, the membrane electrode gas diffusion layer assembly, and the sealing so that the flow path forming member and the sealing plate protrude into the discharge through hole. A laminating step of laminating a plate, the flow path forming member, and the other separator;
A sealing material forming step of curing the semi-cured sealing material to form the sealing material;
A method for producing a fuel cell comprising:

A method for producing a fuel cell, comprising:
The fuel battery cell is
A membrane electrode gas diffusion layer assembly comprising: a membrane electrode assembly formed by bonding electrodes to both surfaces of the electrolyte membrane; and a gas diffusion layer bonded to the surface of the membrane electrode assembly;
A flow path forming member that is laminated on the surface of the gas diffusion layer and forms a gas flow path for flowing a reaction gas for power generation along the surface of the gas diffusion layer, the flow path forming member comprising a porous body When,
A pair of separators sandwiching the membrane electrode gas diffusion layer assembly and the flow path forming member;
A sealing material formed around the membrane electrode gas diffusion layer assembly between the pair of separators, the sealing material formed by curing a liquid sealing material having fluidity;
A sealing plate disposed between the sealing material and the flow path forming member to prevent the liquid sealing material from flowing into the flow path forming member when forming the sealing material;
With
The separator includes a discharge through hole penetrating in the thickness direction of the separator, and the discharge through hole for discharging the exhaust gas discharged from the flow path forming member to the outside of the fuel cell. And
The sealing material is formed around the discharge through hole between the pair of separators,
The fuel cell manufacturing method includes
One of the separators, the membrane electrode gas diffusion layer assembly, the sealing plate, and the flow path formation so that the flow path forming member and the sealing plate project into the discharge through hole. A laminating step of laminating the member and the other separator;
An injection step of injecting the liquid sealing material between the one separator and the other separator;
A sealing material forming step of thermosetting the liquid sealing material to form the sealing material;
A method for producing a fuel cell comprising:

A method for producing a fuel cell according to any one of claims 7 to 12,
The sealing plate is joined in advance to the flow path forming member.
Manufacturing method of fuel cell.