JP5320141B2 - Solid polymer fuel cell and fuel cell stack - Google Patents

Description

  The present invention relates to a polymer electrolyte fuel cell and a fuel cell stack.

  The polymer electrolyte fuel cell includes a fuel cell stack, and the fuel cell stack has a structure in which fuel cells are stacked. A fuel cell includes a membrane electrode assembly (hereinafter also referred to as “MEA”) having a polymer electrolyte membrane and a pair of catalyst electrodes (an anode electrode and a cathode electrode) sandwiching the polymer electrolyte membrane, a membrane electrode A pair of separators sandwiching the joined body.

  The polymer electrolyte membrane is composed of an electrolyte having a fluororesin ion exchange membrane having a sulfonic acid group, a polymer ion exchange membrane such as a hydrocarbon resin ion exchange membrane, and the like. The catalyst electrode is located on the polymer electrolyte membrane side, and includes a catalyst layer that promotes a redox reaction in the catalyst electrode, and a gas diffusion layer that is located outside the catalyst layer and has air permeability and conductivity. . Furthermore, the gas diffusion layer is located on the catalyst layer side, and a carbon coating layer for improving the contact property with the catalyst layer, and a gas diffusion base material for diffusing a gas supplied from the outside and supplying the catalyst layer Composed of layers. The catalyst layer of the anode electrode includes, for example, platinum or an alloy of platinum and ruthenium; the catalyst layer of the cathode electrode includes, for example, an alloy of platinum, platinum, and cobalt. There has also been proposed a device for improving the assembly workability of the fuel cell by integrating the membrane electrode assembly (MEA) with the frame (see Patent Document 1).

  The separator is a conductive member for preventing the fuel gas supplied to the anode electrode from being mixed with the oxidizing gas supplied to the cathode electrode.

  The fuel cell stack can be electrically connected in series by stacking such single cells. In addition to taking out the electricity generated by the fuel cell stack, the fuel cell sometimes uses the heat generated by the power generation by collecting it with a refrigerant (cogeneration system).

  The voltage and current obtained from the fuel cell generally decrease when the current value is increased to increase the amount of power generation (IV characteristics of the fuel cell). As the voltage value decreases, the ratio of the heat generation amount to the power generation amount increases; as the voltage value increases, the heat generation amount relative to the power generation amount decreases. On the other hand, a certain amount of heat generated from the fuel cell is dissipated to the external environment, but this heat release amount is almost constant regardless of the operating state of the fuel cell. Therefore, when the current value is low (that is, when the amount of heat generated is small), the heat recovery efficiency tends to decrease.

  In order to increase the recovery efficiency of the generated heat quantity, it is preferable to suppress heat dissipation to the external environment. In order to reduce heat generated by power generation in the fuel cell from being dissipated to the external environment, it has been proposed to seal the fuel cell stack with silicone rubber (see Patent Document 2). To seal the fuel cell stack with rubber, the outer periphery of the side surface of the assembled fuel cell stack is flattened with low-viscosity rubber; and further sealed with high-viscosity rubber. The equipment for that purpose tends to be large, and mass production is difficult.

International Publication No. 2007/123191 Pamphlet Special table 2007-534111 gazette

  An object of the present invention is to efficiently dissipate heat by a refrigerant while suppressing the diffusion of heat generated in a fuel cell to the external environment. Furthermore, simplification of the assembly process of the fuel cell, facilitation of repair of the fuel cell, and recycling of the fuel cell are promoted.

  The present invention efficiently recovers heat generated in the fuel cell by adding a member functioning as an outer peripheral seal to the frame integrated with the MEA; and further assembling the fuel cell and the fuel cell stack; Easy disassembly. That is, the present invention relates to the following polymer electrolyte fuel cell and fuel cell stack.

[1] A frame in which a flow path port through which each of fuel gas, oxidant gas and refrigerant flows is formed, a polymer electrolyte membrane disposed inside the frame, and a pair of electrodes sandwiching the polymer electrolyte membrane A frame-integrated MEA in which a sealing material that surrounds the gas flow path opening and the electrode and an outer peripheral sealing material disposed on the outer periphery of the frame are integrally formed; fuel gas is applied to one of the pair of electrodes An anode separator having a flow path for supplying and discharging; and a cathode separator having a flow path for supplying and discharging oxidant gas to the other of the pair of electrodes;
The peripheral sealing material covers the outer periphery of the cathode separator and the anode separator, and between the outer periphery of each of the anode separator and the cathode separator, and to form a plurality of independent voids, and
The polymer electrolyte fuel cell , wherein the outer peripheral surfaces of the anode separator and the cathode separator covered with the outer peripheral sealing material have irregularities .

[2] The polymer electrolyte fuel cell according to [1], wherein a surface of the outer peripheral sealing material covering outer peripheries of the anode separator and the cathode separator has irregularities.
[ 3 ] The polymer electrolyte fuel cell according to [ 1 ], wherein an outer peripheral surface of the outer peripheral sealing material has irregularities, and an outer cover is disposed on the outer peripheral surface of the outer peripheral sealing material.

[4] The polymer electrolyte fuel cell according to any one of [1] to [3], wherein the outer peripheral sealing material and the sealing material surrounding the gas flow path port and the electrode are the same material.
[5] The polymer electrolyte fuel cell according to any one of [1] to [4], wherein the outer peripheral sealing material is a foamed elastomer.
[6] A fuel cell stack having the fuel cell stack according to any one of [1] to [5].
[7] A frame in which a flow path port through which each of fuel gas, oxidant gas and refrigerant flows is formed, a polymer electrolyte membrane disposed inside the frame, and a pair of electrodes sandwiching the polymer electrolyte membrane A frame-integrated MEA in which a sealing material that surrounds the channel opening and the electrode and an outer peripheral sealing material disposed on the outer periphery of the frame are integrally formed;
An anode separator having a flow path for supplying and discharging fuel gas to one of the pair of electrodes; and a cathode separator having a flow path for supplying and discharging oxidant gas to the other of the pair of electrodes. A molecular fuel cell,
The outer periphery sealing material covers the outer periphery of the anode separator and the cathode separator, and forms a plurality of independent gaps between the outer periphery of the anode separator and the cathode separator, and
The polymer electrolyte fuel cell , wherein the outer peripheral sealing material and the sealing material surrounding the channel opening and the electrode are the same material .

  The fuel cell obtained from the fuel cell and the fuel cell stack of the present invention hardly dissipates heat generated by power generation to the external environment. Therefore, the fuel cell can efficiently recover heat with the refrigerant, and is suitably applied to a cogeneration system. Further, the fuel cell of the present invention is easy to assemble and easy to disassemble after assembling, so that it is easy to repair and recycle.

1 is a perspective view of a frame-integrated MEA, a cathode separator, and an anode separator that constitute a fuel battery cell of the present invention. A part of each member shows a cross section. It is a figure which shows the cross section of the fuel cell stack which laminated | stacked the fuel cell of the 1st aspect. It is an enlarged view of the contact part vicinity of the outer periphery sealing material and separator of frame body integrated type MEA. 1 is a perspective view of a fuel cell including a fuel cell stack. It is a figure which shows the cross section of the fuel cell stack which laminated | stacked the fuel cell of the 2nd aspect. It is an enlarged view of the contact part vicinity of the outer periphery sealing material and separator of frame body integrated type MEA. It is a figure which shows the cross section of the fuel cell stack which laminated | stacked the fuel cell of the 3rd aspect. It is an enlarged view of the contact part vicinity of the outer periphery sealing material and separator of frame body integrated type MEA. It is a perspective view which shows the frame integrated MEA of a 4th aspect. A part shows a cross section. The production flow of the fuel battery cell of this invention is shown.

  The polymer electrolyte fuel cell of the present invention has 1) a frame-integrated MEA, 2) an anode separator, and 3) a cathode separator.

  The frame-integrated MEA has a frame having a channel opening, a solid polymer electrolyte membrane disposed inside the frame, and a pair of electrodes (anode electrode and cathode electrode) sandwiching the solid polymer electrolyte membrane And a sealing material surrounding the channel opening and the electrode, and an outer peripheral sealing material disposed on the outer periphery of the frame. These are preferably integrated to form a frame-integrated MEA.

  The anode separator and the cathode separator are made of a conductive material. Examples of the conductive material include a carbon material and a metal. Although the thickness of a carbon separator is about 2-3 mm, it can also be made thinner.

  A groove (flow path) through which the fuel gas flows is formed on the surface facing the anode electrode of the anode separator, and the fuel gas is supplied to the anode electrode or discharged from the anode electrode through the groove. A groove (flow path) through which the oxidant gas flows is formed on the surface facing the cathode electrode of the cathode separator, and the oxidant gas is supplied to the cathode electrode or discharged from the cathode electrode through the groove. To do.

  The material of the frame of the frame-integrated MEA is preferably an olefin resin having high chemical resistance and little elution, and examples of the olefin resin include polypropylene and polyethylene. This is to suppress elution and extend the life of the battery. Further, the frame material is required to have high heat resistance. This is because the operating environment of the fuel cell is, for example, about 60 to 80 ° C. Therefore, the material of the frame is more preferably polypropylene.

  A plurality of flow passage openings are formed in the frame. The flow path port includes 1) a gas flow path port constituting a fuel gas supply manifold, 2) a gas flow path port constituting a fuel gas discharge manifold, 3) a gas flow path port constituting an oxidant gas supply manifold, and 4) It may include a gas flow path opening constituting the oxidant gas discharge manifold, 5) a refrigerant flow path opening constituting the refrigerant supply manifold, and 6) a refrigerant flow path opening constituting the refrigerant discharge manifold.

  The polymer electrolyte membrane disposed inside the frame of the frame is not particularly limited as long as it is a thin film-like membrane that allows hydrogen ions to pass but does not allow electrons to pass. Generally, a fluororesin polymer film is used.

  The pair of electrodes disposed on both surfaces of the polymer electrolyte membrane includes a cathode electrode (also referred to as an air electrode) to which an oxidant is supplied and an anode electrode (also referred to as a fuel electrode) to which fuel gas is supplied. Each electrode is not particularly limited, and may be carbon or the like carrying a catalyst such as platinum.

  The sealing material that surrounds the channel opening and the electrode is a member that prevents gas and refrigerant flowing through the channel opening and the electrode from leaking to the outside, and prevents external gas from entering the gas channel opening and the electrode. The material of the sealing material is usually rubber.

  Furthermore, an outer peripheral sealing material is disposed on the outer periphery of the frame body of the frame-integrated MEA of the present invention. It is preferable that the outer periphery sealing material arrange | positioned at the outer periphery of a frame is formed with the elastic material. The elastic material is rubber or the like, and types of rubber include isoprene rubber, styrene butadiene rubber, butadiene rubber, chloroprene rubber, urethane rubber, silicone rubber, fluorine rubber and the like, but are not particularly limited.

  When a frame-integrated MEA, an anode separator, and a cathode separator are stacked to form a solid polymer fuel cell, the outer peripheral sealing material of the frame-integrated MEA preferably covers the outer periphery of each separator. The outer periphery sealing material covering the outer periphery of the separator suppresses the heat of the separator from being dissipated to the external environment.

  In order to suppress the diffusion of heat of the separator to the external environment, it is preferable that a plurality of independent voids are formed between the outer periphery of the separator and the outer peripheral sealing material. This is because the air gap acts as a heat insulating layer, so that heat dissipation is further suppressed. The plurality of voids are preferably independent of each other. This is to suppress heat convection between the gaps. The means for forming this void will be described later.

  The outer peripheral sealing material may be formed of the same material (for example, rubber) as the sealing material surrounding the channel opening and the electrode formed in the frame body. The seal material that surrounds the flow path opening and the electrode of the frame can be arranged by forming two colors on the frame including the MEA integrated inside the frame; the seal material that surrounds the flow path opening and the electrode, and the outer peripheral seal material Are the same material, the sealing material surrounding the gas channel opening and the electrode and the outer peripheral sealing material can be simultaneously molded in one step.

  On the other hand, the material of the outer peripheral sealing material may be a foamed elastomer. A foamed elastomer is a foamed material obtained by foaming inside an elastomer. The foamed elastomer has a large number of air bubbles inside, and the air bubbles act as a heat insulating layer, so that the heat insulating performance is high. Therefore, the outer periphery sealing material which consists of a foamed elastomer can suppress more effectively that the calorie | heat amount which a separator has dissipates to an external environment.

  The frame-integrated MEA can be manufactured by any method, but can be manufactured by, for example, the flow shown in FIG.

  In step A, a solid polymer electrolyte membrane is prepared; in step B, a frame is prepared. In the C step, the solid polymer electrolyte membrane prepared in the A step is disposed inside the frame body prepared in the B step, and an anode electrode and a cathode electrode are formed on both sides of the solid polymer electrolyte membrane. Then, the MEA is fixed inside the frame.

  In step D1, a sealing material that surrounds the flow path opening of the frame body and a sealing material that surrounds the electrode are formed (for example, two colors are formed). In step D2, an outer periphery sealing material for the frame is formed. Thereby, the frame integrated MEA is manufactured. The order of the D1 step and the D2 step is not limited; and if the outer peripheral sealing material of the frame is the same as the material of the sealing material that surrounds the flow path port of the frame and the sealing material that surrounds the electrode, the order is one step. It can also be done.

  If the obtained frame-integrated MEA, the anode separator, and the cathode separator are stacked in step E, a fuel cell can be obtained. If fuel cells are further stacked, a fuel cell stack can be obtained.

  Thus, according to the present invention, when the fuel cell is assembled, the outer peripheral sealing material covers the separator. Therefore, it is necessary to dispose the outer peripheral sealing material after the fuel cell assembly or after the fuel cell stack assembly. Absent. Therefore, there is no need for equipment for providing the outer peripheral sealing material, and manufacturing is easy.

  Further, the assembled fuel cell or fuel cell stack can be easily disassembled because it is not necessary to remove the outer peripheral seal material. Therefore, it becomes easy to repair the fuel cell after the assembly, replace the member, or recycle.

  As described above, the polymer electrolyte fuel cell of the present invention can be obtained by laminating the frame-integrated MEA between the anode separator and the cathode separator. By this lamination, the outer periphery (side surface outer periphery) of the anode separator and the cathode separator is covered with the outer peripheral seal of the frame-integrated MEA. The outer peripheries of the anode separator and the cathode separator and the outer peripheral sealing material of the frame-integrated MEA are characterized in that a plurality of independent gaps are formed between them without being in close contact with each other.

  In order to form a plurality of independent voids between the outer periphery of the separator and the outer peripheral seal, 1) the surface of the outer peripheral sealing material that covers the outer periphery of the separator is formed into an uneven shape (described later) (Refer to Embodiment 1); or 2) The outer peripheral surface of the separator (the surface covered with the outer peripheral sealing material) may have an uneven shape (see Embodiments 2 and 3 to be described later). If the surface of the outer peripheral sealing material or the outer peripheral surface of the separator is formed into a concavo-convex shape, the separator and the outer peripheral sealing material are in contact with each other only at the convex portion, and a gap is formed without contact at the concave portion.

  The polymer electrolyte fuel cell generates power with MEA, but generates heat as well as power generation. It is preferable that the heat generated in the power generation is efficiently absorbed by the refrigerant and recovered. For this purpose, it is preferable to suppress the generated heat amount from being radiated to the external environment. As described above, the separator is a conductive member and is generally made of a metal or a carbon material, and these generally have high thermal conductivity. Therefore, in particular, the amount of heat generated by the power generation in the MEA is easily released to the outside through the separator.

  Therefore, in the present invention, the outer periphery of the separator is covered with the outer peripheral sealing material of the frame; however, a plurality of gaps are provided between the outer periphery of the separator and the outer peripheral sealing material. If voids are formed, the voids act as a heat insulating layer, and the heat dissipation of the separator can be more effectively suppressed.

  By stacking the polymer electrolyte fuel cells of the present invention, a fuel cell stack can be obtained. What is necessary is just to set suitably the number of lamination | stacking of a polymer electrolyte fuel cell according to a desired output. The polymer electrolyte fuel cell stack is sandwiched between current collector plates at both ends; and may be further sandwiched between end plates.

  Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1]
FIG. 1 shows a frame-integrated MEA 10 and a pair of separators composed of a cathode separator 20 and an anode separator 30. When the frame-integrated MEA 10, the cathode separator 20, and the anode separator 30 are laminated, a fuel cell is configured.

  The frame integrated MEA 10 includes a frame 11 and an MEA 12. The surface of the MEA 12 facing the cathode separator 20 is a cathode electrode, and the surface of the MEA 12 facing the anode separator 30 is an anode electrode. The frame body 11 is formed with flow path ports 13 and 13 'through which fuel gas flows, flow path ports 14 and 14' through which refrigerant flows, and flow path ports 15 and 15 'through which oxidant gas flows.

  The frame-integrated MEA 10 includes seal members 17-1 to 17-5 that surround each flow path opening and the electrode of the MEA 12. Among these, the sealing material 17-1 surrounds the flow path openings 15 and 15 ′ through which the oxidizing gas flows and the cathode electrode of the MEA 12; the flow path openings 15 and 15 ′ and the MEA 12 can communicate with each other.

  Although not shown, the surface of the frame-integrated MEA 10 that faces the anode separator 30 also has a sealing material that surrounds each channel port and the electrode of the MEA 12. One of the sealing materials surrounds the flow path openings 13 and 13 ′ through which the fuel gas flows and the cathode electrode of the MEA 12; the flow path openings 13 and 13 ′ and the MEA 12 can communicate with each other.

  Further, an outer peripheral sealing material 16 is disposed on the outer periphery of the frame 11 of the frame integrated MEA 10.

  On the surface of the cathode separator 20 facing the MEA 12, a gas flow path is formed for flowing an oxidant gas containing oxygen (for example, air); both ends of the gas flow path are respectively flow path openings of the frame 11. 15 and 15 '. Oxidant gas is supplied to or discharged from the gas passage through the passage openings 15 and 15 '.

  On the surface of the anode separator 30 facing the MEA 12, a gas flow path for flowing a fuel gas (for example, hydrogen) is formed; both ends of the gas flow path communicate with the flow path ports 13 and 13 ′, respectively. Yes. Fuel gas is supplied to or discharged from the gas flow path through the flow path ports 13 and 13 '.

  FIG. 2A shows a state in which three fuel cell units each including the frame-integrated MEA 10 shown in FIG. 1, the cathode separator 20, and the anode separator 30 are stacked. As shown in FIG. 2A, the outer peripheral sealing material 16 of the frame-integrated MEA 10 covers the outer periphery of the cathode separator 20 and the anode separator 30. Further, since the outer peripheral seals 16 are brought into close contact with each other by stacking the fuel cells and cover the frame-integrated MEA 10 and the separators 20 and 30, the entire stack is covered with the outer peripheral seal material 16.

  Electric power is generated by the MEA 12 using the oxidant gas flowing in the gas flow path of the cathode separator 20 and the fuel gas flowing in the anode separator 30. The amount of heat generated in this power generation is preferably efficiently absorbed by the refrigerant flowing through the flow path openings 14 and 14 'through which the refrigerant flows. For this purpose, it is preferable to suppress the heat generated by the power generation in the MEA 12 from being radiated to the external environment.

  As described above, the separator is generally made of a metal or carbon material having high thermal conductivity. Therefore, in particular, the amount of heat generated by the power generation in the MEA is easily transmitted to the external environment through the separator. Therefore, in the present invention, the frame and the outer periphery of the separator are covered with the outer peripheral sealing material; however, as shown in FIG. 2B, the surface of the outer peripheral sealing material 16 covering the outer periphery of the separator (20 or 30) is uneven. Since it has a shape, a plurality of independent voids are formed without the separator (20 or 30) and the outer peripheral sealing material 16 being in close contact with each other. Since this space | gap acts as a heat insulation layer, heat insulation sealability improves more.

  As shown in FIG. 2B, the separator (20 or 30) and the outer peripheral sealing material 16 do not completely adhere to each other, and a plurality of gaps are formed between them. Here, the “contact area between the separator (20 or 30) and the heat insulating sealing material 16” is 30 to 50%, preferably about 30 with respect to the contact area of both when it is assumed that they are completely adhered. %. The smaller the contact area, the higher the heat insulation. However, if the contact area is too small, the rigidity of the sealing material 16 may not be ensured.

  It is preferable that the recessed part of the outer periphery sealing material 16 is formed over the thickness direction of a separator. This is to reduce the contact area with the separator as much as possible.

  Further, as shown in FIG. 2B, the ratio of the concave portion width L1 to the convex portion width L2 of the concave and convex portions formed on the surface of the outer peripheral sealing material 16 is L1: L2 = about 2: 1. Good; L1 = about 2 mm and L2 = about 1 mm. If the volume of each of the voids formed by the recesses is too large, convection is generated in the voids, which may reduce the heat insulation. L3 may be appropriately set from the viewpoint of securing the rigidity of the sealing material 16 and the like.

  As shown in FIG. 3, a fuel cell stack 100 obtained by stacking fuel cells composed of a frame-integrated MEA 10, a cathode separator 20, and an anode separator 30 includes a pair of current collector plates 110 and 110 ′. Further, the fuel cell may be sandwiched between a pair of end plates 120 and 120 ′. The fuel cell stack 100, the current collecting plates 110 and 110 ', and the end plates 120 and 120' are integrated with a fastening member 130 such as a bolt and a nut.

[Embodiment 2]
FIG. 4A shows a state in which three fuel cells are stacked, as in FIG. 2A. Each fuel cell includes a frame-integrated MEA 10 ′, a cathode separator 20 ′, and an anode separator 30 ′. The shape of the outer peripheral sealing material 16 ′ of the frame-integrated MEA 10 ′ is different from the shape of the outer peripheral sealing material 16 of the frame-integrated MEA 10 in FIG. 2A, but the other configurations are the same. Further, the cathode separator 20 ′ and the anode separator 30 ′ are different from the outer peripheral surfaces of the cathode separator 20 and the anode separator 30 in FIG. The configuration of is the same.

  As shown in FIG. 4B, since the outer peripheral surface of the separator (20 ′ or 30 ′) has an uneven shape, the outer peripheral surface of the separator (20 ′ or 30 ′) and the outer peripheral sealing material 16 ′ do not adhere to each other. A plurality of independent voids are formed. Similar to the first embodiment, since the gap acts as a heat insulating layer, the same heat insulating effect can be obtained.

[Embodiment 3]
FIG. 5A shows a state in which three fuel cells are stacked, as in FIG. 4A. Each fuel cell includes a frame-integrated MEA 10 ″, a cathode separator 20 ′, and an anode separator 30 ′. The frame-integrated MEA 10 ″ has the same configuration except that the shape of the outer peripheral sealing material 16 ″ is different from the shape of the outer peripheral sealing material 16 ′ of the frame-integrated MEA 10 ′ in FIG. 4A. The cathode separator 20 ′ and the anode separator 30 ′ are the same as the separators in FIG. 4A.

  The periphery of the stack of fuel cells shown in FIG. 5A is covered with an exterior cover 40. The exterior cover 40 is in contact with the outer peripheral sealing material 16 ″ of the frame-integrated MEA 10 ″.

  As shown in FIG. 5B, the outer peripheral surface of the separator (20 ′ or 30 ′) has an uneven shape, so that the outer peripheral surface of the separator (20 ′ or 30 ′) and the outer peripheral sealing material 16 ″ are in close contact with each other. A plurality of voids are formed. Further, an uneven shape is also formed on the outer periphery of the outer peripheral sealing material 16 ″. Therefore, the outer peripheral sealing material 16 ″ and the outer cover 40 do not come into close contact with each other, and the amount of heat generated in the fuel cell is further suppressed to the external environment.

[Embodiment 4]
FIG. 6 shows a frame-integrated MEA 10 ′ ″. The frame-integrated MEA 10 ′ ″ is the same as the frame-integrated MEA 10 shown in FIG. The protrusion 18 only needs to be made of the same material (elastic member) as the outer peripheral sealing material 16 and can be integrally formed when the outer peripheral sealing material 16 is formed. The frame-integrated MEA 10 ′ ″ shown in FIG. 6 constitutes a fuel cell together with the cathode separator 20 and the anode separator 30 shown in FIG. 1; and further, as shown in FIG. A stack; it can be a fuel cell as shown in FIG.

  The protrusion 18 is preferably used as a scaffold when the fuel cell of the present invention is to be installed at a predetermined position. If the fuel cell is installed using the protrusion 18 as a scaffold, the contact area between the outer peripheral sealing material 16 and the installation site is reduced. Therefore, it can further suppress that the calorie | heat amount which generate | occur | produced in the fuel cell transmits to the outer periphery sealing material 16, and dissipates to an external environment.

  When the fuel cell of the present invention is applied to a cogeneration system, the heat recovery efficiency of the system can be increased. In addition, the fuel cell of the present invention is easy to assemble and disassemble, and therefore is easy to recycle.

10, 10 ', 10 ", 10'" frame integrated MEA
11 Frame 12 MEA
13, 13 ′ Flow path port through which the fuel gas flows 14, 14 ′ Flow path port through which the refrigerant flows 15, 15 ′ Flow path port through which the oxidant gas flows 16, 16 ′, 16 ″ Peripheral seal material 17-1 to 17-5 Seal material 18 Projection 20, 20 ′ Cathode separator 30, 30 ′ Anode separator 40 Exterior cover 100 Fuel cell stack 110, 110 ′ Current collector plate 120, 120 ′ End plate 130 Fastening member L1-L3 Length

Claims (7)

A frame in which a flow path port through which each of fuel gas, oxidant gas and refrigerant flows is formed; a polymer electrolyte membrane disposed inside the frame; a pair of electrodes sandwiching the polymer electrolyte membrane; and the flow A frame-integrated MEA in which a sealing material that surrounds the roadway and the electrode and an outer peripheral sealing material disposed on the outer periphery of the frame are integrally formed;
An anode separator having a flow path for supplying and discharging fuel gas to one of the pair of electrodes; and a cathode separator having a flow path for supplying and discharging oxidant gas to the other of the pair of electrodes. A molecular fuel cell,
The outer periphery sealing material covers the outer periphery of the anode separator and the cathode separator, and forms a plurality of independent gaps between the outer periphery of the anode separator and the cathode separator, and the outer periphery sealing material The polymer electrolyte fuel cell, wherein the outer peripheral surfaces of the anode separator and the cathode separator to be covered have irregularities.   2. The polymer electrolyte fuel cell according to claim 1, wherein a surface of the outer peripheral sealing material covering outer peripheries of the anode separator and the cathode separator has irregularities.   2. The polymer electrolyte fuel cell according to claim 1, wherein an outer peripheral surface of the outer peripheral sealing material has irregularities, and an outer cover is disposed on the outer peripheral surface of the outer peripheral sealing material.   2. The solid polymer fuel cell according to claim 1, wherein the outer peripheral sealing material and the sealing material surrounding the flow path opening and the electrode are the same material.   The polymer electrolyte fuel cell according to claim 1, wherein the outer peripheral sealing material is a foamed elastomer.   A fuel cell stack comprising the laminate of polymer electrolyte fuel cells according to claim 1. A frame in which a flow path port through which each of fuel gas, oxidant gas and refrigerant flows is formed; a polymer electrolyte membrane disposed inside the frame; a pair of electrodes sandwiching the polymer electrolyte membrane; and the flow A frame-integrated MEA in which a sealing material that surrounds the roadway and the electrode and an outer peripheral sealing material disposed on the outer periphery of the frame are integrally formed;
An anode separator having a flow path for supplying and discharging fuel gas to one of the pair of electrodes; and a cathode separator having a flow path for supplying and discharging oxidant gas to the other of the pair of electrodes. A molecular fuel cell,
The outer periphery sealing material covers the outer periphery of the anode separator and the cathode separator, and forms a plurality of independent gaps between the outer periphery of the anode separator and the cathode separator, and
The polymer electrolyte fuel cell , wherein the outer peripheral sealing material and the sealing material surrounding the channel opening and the electrode are the same material .