KR101992322B1 - Gasket embedded separator for fuel cell - Google Patents

Abstract

Disclosed is a gasket-integrated separator for a fuel cell, wherein a gasket of a rubber material is integrally bonded to a metal plate. The disclosed gasket-integrated separator for a fuel cell of the present invention comprises: a metal plate which is a plate-shaped member made of a metal material, having one side surface which is a reaction gas side surface through which a reaction gas flows, and the other side surface which is a coolant side surface through which a coolant flows, and including a reaction region disposed in a central portion thereof, and a plurality of reaction gas through-holes and a plurality of coolant through-holes, disposed outside the reaction region; a reaction gas side surface gasket made of a rubber material, and stacked not to close the reaction gas through-holes and the coolant through-holes a region except for the reaction region on the reaction gas side surface of the metal plate; and a coolant side surface gasket, made of a rubber material, and stacked not to close the reaction gas through-holes and the coolant through-holes in a region except for the reaction region on the coolant side surface of the metal plate. The reaction gas side surface gasket and the coolant side surface gasket separately include a sealing reinforcement unit extending in parallel with a boundary line of the reaction region between the reaction gas through-holes and the reaction region. The sealing reinforcement unit of the reaction gas side surface gasket and that of the coolant side surface gasket are arranged to overlap each other with the metal plate interposed therebetween.

Description

[0001] Gasket embedded separator for fuel cell [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separator for a fuel cell, and more particularly, to a gasket integral separator for a fuel cell in which a rubber gasket is integrally joined to a metal plate.

Fuel Cell is a power generation system that directly converts the chemical reaction energy of hydrogen and oxygen contained in a hydrocarbon-based material such as methanol, ethanol, and natural gas into electrical energy. PEMFC (Polymer Electrolyte Membrane Fuel Cell) has lower operating temperature than other types of fuel cells, and has a quick start and response characteristic. It is also possible to modify methanol, ethanol or natural gas By using hydrogen as a fuel, it has a wide range of applications such as a mobile power source used in automobiles, a distributed power source such as a house, a public building, and a small power source such as an electronic device.

On the other hand, in a fuel cell, a unit cell itself has a stack structure in which unit cells are stacked because the voltage is low and practicality is low. Specifically, the fuel cell stack has a structure in which unit cells consisting of a membrane-electrode assembly (MEA) and a separator are stacked in several to several hundred layers. The membrane-electrode assembly has a structure in which an anode electrode, also called a fuel electrode or an oxidation electrode, and a cathode electrode, which is also called an air electrode or a reduction electrode, are attached with an electrolyte membrane sandwiched therebetween.

The separator plate has a function of structurally supporting a gas diffusion layer (GDL) and a membrane-electrode assembly, a function of supplying hydrogen gas and oxygen necessary for the reaction of the fuel cell, and an anode electrode And serves as a conductor for connecting the cathode electrodes in series. Particularly, hydrogen gas is supplied to the anode electrode and oxygen is supplied to the cathode electrode by the separation plate. In this process, an electrochemical oxidation reaction of hydrogen gas occurs at the anode electrode, and an electrochemical reduction reaction of oxygen occurs at the cathode electrode. At this time, due to the movement of generated electrons, reaction heat is generated with electricity, . In order to cool the reaction heat, cooling water is supplied to the cooling passage of the separator plate.

A gasket for a fuel cell is smoothly introduced into the reaction region overlapping with the membrane electrode assembly without hydrogen gas, air, and cooling water, and is guided to be smoothly discharged from the reaction region. Also, the gap between the separator and the membrane-electrode assembly is kept constant, and the hydrogen gas, air, and cooling water are sealed so as not to be mixed with each other or leaked out.

On the other hand, there is known a gasket integral separator plate in which a gasket is integrally bonded to a separator plate so that the separator plate, the membrane-electrode assembly, and the gasket can be easily aligned and laminated when the fuel cell stack is assembled, And is disclosed in Patent Registration No. 10-1134429. However, when the conventional gasket integrated type separator is laminated to form the fuel cell stack, the load is concentrated on the guide line, and the contact surface pressure is weakened in the main line, have.

Korean Patent Publication No. 10-1134429

Disclosed is a gasket integral type separator for a fuel cell in which sealing performance is improved so that no mixing or fluid outflow occurs between different types of fluids.

The present invention relates to a separator plate constituting a fuel cell stack, which is a plate-like member formed of a metal material, wherein one side is a side of the reaction gas through which the reaction gas flows, and the opposite side is a side of the cooling water through which the cooling water flows, A plurality of reaction gas through holes and a plurality of cooling water through holes disposed outside the reaction region, and a rubber plate made of a rubber material, wherein the plurality of A reaction gas side gasket laminated so as not to close the reaction gas through holes and a plurality of cooling water through holes, and a rubber gasket formed on the cooling water side of the metal plate except for the reaction zone, And a cooling water side gasket laminated so as not to close the through hole, wherein the reaction gas side gasket And the cooling water side gasket each have a sealing reinforcement extending parallel to the boundary line of the reaction zone between the reaction gas through hole and the reaction zone, wherein the sealing reinforcement of the reaction gas side gasket and the sealing reinforcement of the cooling water side gasket And a gasket integral type separator for a fuel cell, wherein the gasket integral type separator plates are arranged so as to overlap with each other with the metal plate interposed therebetween.

The cooling water side gasket may further include a guide protrusion which protrudes toward the reaction area side intersecting the boundary line of the reaction area and guides the cooling water flowing along the boundary line of the reaction area toward the center of the reaction area.

Wherein the gasket integral type separator for a fuel cell has a pair of the metal plates, the pair of metal plates are disposed adjacent to one plane, the gasket integral separator plate for a fuel cell is formed of a rubber material, A connecting gasket integrally formed with the reaction gas side gasket and the cooling water side gasket laminated on the metal plate to connect the pair of metal plates, wherein the thickness of the connecting gasket is determined by the thickness of the reaction gas side gasket, The thickness of the gasket, and the thickness of the metal plate.

The reaction gas side gasket and the cooling water side gasket each have a metal plate end gasket portion adjacent to the connection gasket and stacked on the end of the metal plate, The thickness of the gasket at the end of the metal plate of the cooling water side gasket, and the thickness of the metal plate.

Wherein the pair of metal plates are symmetrical with respect to an imaginary center line bisecting the gasket integral type separator for fuel cells and the pair of metal plates are connected by the connection gasket, And at least a part of the through holes of the plurality of cooling water holes may be formed.

The reaction gas side gasket and the cooling water side gasket are formed by insert injection in which the metal plate is inserted and fixed in a mold and injection molten resin corresponding to the rubber material is injected into the mold, And the cooling water side gasket may be formed with grooves for fixing the metal plate so that the metal plate is not contacted with the metal mold so as to be bent so that the rubber material is not filled but the metal plate is exposed.

A plurality of joining auxiliary holes are formed in the metal plate outside the reaction zone and a rubber material of the reaction gas side gasket is adhered to the plurality of joining auxiliary holes so that the surface area of joining the reaction gas side gasket to the metal plate becomes large. Can be filled.

The thickness of the cooling water side gasket may be greater than the thickness of the reaction gas side gasket.

The gasket integral type separator for a fuel cell of the present invention has a sealing reinforcement portion extending parallel to a boundary line of a reaction region on a side of a reaction gas and a side of a cooling water of a metal plate and overlapping each other. Therefore, when a plurality of gasket integrated type separators for fuel cells and membrane-electrode assemblies are stacked to assemble the fuel cell stack, the sealing reinforcement parts are pressed and pressed uniformly to form a uniform pressure The sealing performance can be reliably improved without intermixing of different kinds of fluids or fluid outflow.

According to the gasket integrated type separator for a fuel cell according to the preferred embodiment of the present invention, the cooling water flowing along the periphery of the reaction zone is guided to the center of the reaction zone to improve cooling efficiency and prevent overheating of the fuel cell stack .

When the fuel cell stack is assembled by stacking the gasket integrated type separator for a fuel cell according to the preferred embodiment of the present invention having the connection gasket, the connection gasket is compressed more tightly than the reaction gas side gasket and the cooling water side gasket. Therefore, even if the connecting gasket is not laminated and supported on the metal plate, the surface pressure of the connecting gasket portion is kept equal to the surface pressure of the reaction gas side gasket and the cooling water side gasket, and the sealing performance is reliably improved do.

1 is a schematic view showing a dual cell type fuel cell stack having a gasket integral type separator according to an embodiment of the present invention.
Fig. 2 and Fig. 3 are a plan view and a bottom view showing the first gasket integrated separator of Fig. 1;
FIG. 4 is a plan view showing the first metal plate of FIG. 2. FIG.
FIG. 5 is a plan view showing the second gasket integrated separator of FIG. 1; FIG.
FIG. 6 is a plan view showing the second metal plate of FIG. 5;
7 is an enlarged view of a portion VII in Fig.
8 is an enlarged view of a portion VIII in Fig.
FIG. 9 is an enlarged cross-sectional view of a portion of the dual-cell fuel cell stack of FIG. 1 in a non-contact state, and is a cross-sectional view of a portion corresponding to IX-IX of FIG.
FIG. 10 is an enlarged cross-sectional view of another portion of the dual-cell fuel cell stack of FIG. 1 in an adhered state, and is a cross-sectional view of a portion corresponding to XX in FIG.

Hereinafter, a gasket integral type separator for a fuel cell according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The terminology used herein is a term used to properly express the preferred embodiment of the present invention, which may vary depending on the intention of the user or operator or the custom in the field to which the present invention belongs. Therefore, the definitions of these terms should be based on the contents throughout this specification.

1 is a schematic view showing a dual cell type fuel cell stack having a gasket integral type separator according to an embodiment of the present invention. Referring to FIG. 1, the dual cell type fuel cell stack 150 includes a plurality of dual cell type separator plates 100, a plurality of MEAs 153, an anode current collector ) 161, and a cathode current collector (162). A plurality of the dual-cell type separator plate assembly 100 and the plurality of membrane-electrode assemblies 153 are alternately arranged in the direction parallel to the Z-axis and are in close contact with each other. A pair of membrane electrode assemblies 153 are disposed in a plane parallel to the XY plane, thereby forming a dual cell type fuel cell stack 150.

The membrane-electrode assembly 153 includes a membrane 154 (see FIG. 10) and an anode electrode 155 (see FIG. 10) stacked on one side and the opposite side of the membrane 154, And a cathode electrode 156 (see Fig. 10). Each of the dual cell type separator plate assemblies 100 includes a first gasket integral separator plate 110 that is in contact with an anode electrode 155 of a pair of membrane electrode assemblies 153 disposed on the same plane, And a second gasket-integrated separator plate 130 which is in face-to-face contact with the cathode electrode 156 of a pair of membrane-electrode assemblies 153 arranged on the same plane.

The anode current collector 161 is disposed on the outer side of the fuel cell stack 150 so as to cover the second separator 130 disposed at the outermost portion of the fuel cell stack 150 and the cathode current collector 162 is disposed on the fuel cell stack 150 And is disposed on the outer side so as to cover the first partition plate 110 disposed at the outermost periphery. Cell type separator assembly 100 and the anode current collector 161 and between the dual cell type separator assembly 100 and the membrane-electrode assembly 153, between the dual cell type separator plate assembly 100 and the anode current collector 161, A gas diffusion layer (GDL) may be interposed between the assembly 100 and the cathode current collector 162.

2 and 3 are a plan view and a bottom view of the first gasket integrated separator of FIG. 1, FIG. 4 is a plan view of the first metal plate of FIG. 2, FIG. 6 is a plan view showing the second metal plate of FIG. 5, FIG. 7 is an enlarged view of the portion VII of FIG. 2, and FIG. 8 is an enlarged view of the portion VIII of FIG. And FIG. 9 is a cross-sectional view of a portion of the dual cell type fuel cell stack of FIG. 1 in an enlarged state without being closely contacted, and is a sectional view of a portion corresponding to IX-IX of FIG. 2, Sectional view of another portion of the cell-type fuel cell stack in an enlarged close-up view, and is a cross-sectional view of a portion corresponding to XX in Fig. Hereinafter, the first dual cell type separator 110 and the second dual cell type separator 130 will be referred to as 'first separator' and 'second separator', respectively.

Referring to FIGS. 2 to 4, the first separator 110 includes a pair of first metal plates 10, and the pair of first metal plates 10 includes a first separator 110 Axis and the Y-axis center line CY, which is an imaginary straight line parallel to the Y-axis. The first separator plate 110 includes a pair of first metal plates 10 and a first gasket 111 joined to and supported by the pair of first metal plates 10.

The first metal plate 10 is a plate-shaped member formed of a metal material and is a so-called 'anode contact metal plate'. The reaction zone 15 of the first metal plate 10 in the dual cell type fuel cell stack 150 (see FIG. 1) is in face-to-face contact with the anode electrode 155 of the membrane- One side of the first metal plate 10 shown in FIGS. 2 and 4 is a side of a reaction gas through which hydrogen gas as a first reaction gas flows, and the opposite side is a side of a cooling water through which cooling water flows. The material of the first metal plate 10 may be, for example, stainless steel, aluminum alloy steel, or nickel alloy steel.

The planar shape of the first metal plate 10 is rectangular and has first to fourth edges 11, 12, 13 and 14 orthogonal to each other. The first edge 11 and the third edge 13 are parallel to each other and extend parallel to the Y axis, and the second edge 12 and the fourth edge 14 are parallel to each other and extend parallel to the X axis. A reaction zone (15) is disposed at the center of the first metal plate (10). An area 30 defined by the two-dot chain line in FIG. 4 as a region close to the center point of the first edge 11 is the first reaction gas manifold region, that is, the hydrogen manifold region. The hydrogen manifold region 30 is provided with first and second hydrogen dents 31 and 33 which are widened to the inside of the first metal plate 10 at the first corner 11. The first and second hydrogen dents 31 and 33 are formed by removing a metal material from the first metal plate 10. The first and second hydrogen dents 31 and 33 are parallel to the X axis, And is formed symmetrically with respect to the center line CX.

A plurality of gates 32 and 34 extending toward the reaction region 15 and spaced apart from each other are formed at one side edge of the hydrogen dent 31 or 33 close to the reaction region 15. The first separator plate 110 includes a pair of first metal plates 10 symmetrically arranged to face the first corners 11 in a plane parallel to the XY plane. The hydrogen dents 31 and 33 of the pair of first metal plates 10 are connected one to the other to form first and second hydrogen holes 101 and 102 through which hydrogen flows in a direction parallel to the Z axis.

In FIG. 4, a pair of equally spaced corners of the three corners except for the first corners 11 where the pair of hydrogen dents 31 and 33 are formed, that is, regions near the second and fourth corners 12 and 14, The pair of regions 35 and 38 defined by the two-dot chain line is provided in the second reaction gas manifold region, that is, the air manifold region. The first air manifold region 35 is provided with a plurality of first air holes 36 through which air flows in a direction parallel to the Z axis. The second air manifold region 38 is provided with a plurality of second air holes 39 through which the air passes in a direction parallel to the Z axis. The first and second air holes 36 and 39 are formed by removing the metal material from the first metal plate 10. The first air vent hole 36 and the second air vent hole 39 are formed symmetrically with respect to the imaginary X axis center line CX which is parallel to the X axis and divides the first metal plate 10 by half.

The regions 41 and 43 defined by the two-dot chain line in Fig. 1 as regions near both ends of the first edge 11 are the first and second cooling water manifold regions. The first cooling water manifold region 41 is a region provided at a corner between the hydrogen manifold region 30 and the first air manifold region 35 and the second cooling water manifold region 43 is a region provided at a corner between the hydrogen manifold region 30 and the first air manifold region 35, Is a region provided at a corner between the hydrogen manifold region 30 and the second air manifold region 38. [ The first cooling water manifold region 41 is provided with one first cooling water dent 42 which is worn inside the first metal plate 10 at the first corner 11, The region 43 is provided with one second cooling water dent 44 which is worn inside the first metal plate 10 at the first corner 11. The first and second cooling water dents 42 and 44 are formed by removing a metal material from the first metal plate 10. The first and second cooling water dents 42 and 44 are virtual X- And is formed symmetrically with respect to the center line CX.

The same cooling water dents (42, 44) of the pair of first metal plates (10) in the first separator plate (110) are connected one-to-one to connect the first and second cooling water holes (103, 104) are formed.

The anode electrode 155 (see Fig. 10) of the membrane-electrode assembly 153 (see Fig. 10) is in face-to-face contact with the reaction zone 15 on the side of the reaction gas shown in Fig. 2 and Fig. In the reaction zone 15 on the side of the reaction gas, the hydrogen gas introduced from the first hydrogen hole 101 of the pair of hydrogen holes 101 and 102 is discharged to the second hydrogen hole 102, A plurality of hydrogen channels 20 extending along the zigzag path are formed so as to flow through the channel 15. The plurality of hydrogen channels 20 extend in parallel without crossing.

As shown in Fig. 10, the hydrogen channel 20 has a concavo-convex cross section. The hydrogen channel 20 having a concavo-convex cross-section is formed by stamping the metal plate by placing it on the press die. Therefore, the hydrogen channel 20 formed by dicing concave on the reaction gas side of the first metal plate 10 3 is an embankment protruding from the side of the cooling water of the first metal plate 10. Further, in the reaction zone 15 on the side of the cooling water, a cooling water flow path 131 through which cooling water flows is formed between adjacent banks. The thickness TH1 of the first metal plate 10 is 80 to 120 占 퐉 and the depth DP1 of the hydrogen channel 20 is 400 to 600 占 퐉.

Each of the hydrogen channels 20 has four X-direction flow paths 21, 22, 23, 24 extending in parallel with the X-axis. A pair of the X-direction flow path portions 21, 22, 23 and 24 is connected to the hydrogen manifold region 30 so as to flow in a direction away from the hydrogen manifold region 30, And the remaining pair 23 and 24 are arranged in a direction approaching the hydrogen manifold region 30, that is, close to the first edge 11 And the first and second reverse flow path portions for guiding the flow of the hydrogen gas to flow in the losing direction. The pair of the forward passage portions 21, 22 and the pair of the backward passage portions 23, 24 are alternately arranged.

Both ends 26,27 of each hydrogen channel 20 are disposed adjacent to the gates 32,34 formed in the first and second hydrogen dent 31,33. One end 26 of each of the two ends 26 and 27 of the plurality of hydrogen channels 20 near the first passage 21 is connected to a plurality of gates 32 formed in the first hydrogen dent 31 And the other end 27 close to the second returning flow path portion 24 is located in a one-to-one correspondence with the plurality of gates 34 formed in the second hydrogen dent 33. When the hydrogen gas moves from the gate 32 formed in the first hydrogen dent 31 to the one end 26 of the hydrogen channel 20, the hydrogen gas flows into the first straight passage portion 21 And flows along the zigzag path through the first backward flow passage portion 23, the second forward flow passage portion 23 and the second backward flow passage portion 24 in this order, And moves to the gate 34 formed in the two-hydrogen dent 33. The length of the hydrogen channel 20 from the one end 26 to the other end 27 is the same within the ± 10% error range in all the hydrogen channels 20 in the reaction zone 15.

A plurality of joining auxiliary holes 45 are formed outside the reaction zone 15. A plurality of joining auxiliary apertures 45 are arranged in series along the boundary lines AR1, AR2, AR3 and AR4 defining the reaction zone 15 and are arranged in series with the first and second cooling water dents 42, Are spaced apart along the diagonal line between the regions (15). However, a bonding auxiliary through hole 45 is not formed between the ends 26 and 27 of the hydrogen channel 20 and the gates 32 and 34. A first gasket (not shown) made of a rubber material is disposed in the hydrogen manifold region 30, the pair of air manifold regions 35 and 38, and the pair of cooling water manifold regions 41 and 43 of the first metal plate 10 111 are bonded. The first gasket 111 is inserted and fixed by inserting and fixing the first metal plate 10 into the cavity of the injection mold (not shown) And injecting the injected resin into the cavity. When the molten resin is injected into the cavity, the molten resin is filled and hardened in the plurality of bonding auxiliary through holes (45), so that compared with the case where the plurality of bonding auxiliary through holes (45) 1 gasket 111, specifically, the reaction gas side gasket 112 is bonded to the first metal plate 10, the surface area becomes large. Accordingly, the first gasket 111 is firmly and integrally joined to the first metal plate 10. [

A plurality of insertion injection aligning through holes 47 are formed at points near four corners of the first metal plate 10. The injection molding die for injection molding the first gasket 111 has a plurality of alignment pins (not shown) in which the plurality of insertion injection aligning through holes 47 are inserted. The first metal plate 10 is aligned with the injection molding die so that the plurality of alignment pins fit into the plurality of insertion injection aligning through holes 47 and the upper core and the lower core of the injection molding die are assembled The first metal plate 10 is inserted and fixed at the correct position in the cavity of the injection molding die.

The first metal plate 10 has a shape symmetrical about a virtual center line spaced the same distance from the first and second air manifold regions 35 and 38, that is, about the X axis center line CX. The air holes 36 in the first air manifold region 35 and the air holes 39 in the second air manifold region 38 are symmetrical to each other and the cooling water in the first cooling water manifold region 41 The dent 42 and the cooling water dent 44 of the second cooling water manifold region 43 are symmetrical to each other and the hydrogen dent 31 and the gate 32 on one side of the hydrogen manifold region 30 and the hydrogen dent 31 on the other side The hydrogen dent 33 and the gate 34 are symmetrical to each other. The first return passage portion 21 and the second return passage portion 24 are symmetrical to each other in each of the hydrogen channels 20 and the first return passage portion 23 and the second return passage portion 22 And one side end 26 and the other side end 27 of each hydrogen channel 20 are symmetrical to each other.

The first gasket 111 is made of a rubber material and includes a reaction gas side gasket 112 laminated on the reaction gas side surface of the pair of first metal plates 10, And a connecting gasket 128 connecting the one metal plate 10 and the other metal plate 10 among the pair of first metal plates 10 to each other. 2 and 3, the first gasket 111 is hatching so that the first gasket 111 can be easily distinguished from the first metal plate 10.

The reaction gas side gasket 112 is stacked on the reaction gas side of the first metal plate 10 except for the reaction region 15 but the hydrogen gas holes 101 and 102, the gates 32 and 34, the cooling water holes 103 , 104, air through holes 36, 39, and insertion injection aligning through holes 47 are not closed. Then, as shown in FIGS. 2 and 10, the reaction gas side gasket 112 is laminated so as to cover the joining auxiliary opening 45. Reference numeral 115 denotes a portion where the side of the reaction gas of the first metal plate 10 is exposed without being laminated with the rubber member and between the air holes 36 and 39 and the reaction region 15 Flow blocking grooves for reliably blocking the flow of air.

The boundary line defining the reaction zone 15 is defined by a first boundary line AR1 close to the first edge 11, a second boundary line AR2 close to the second edge 12, a second boundary line AR2 close to the third edge 13, 3 boundary line AR3, and a fourth boundary line AR4 close to the fourth corner 14. [ The reaction gas side gasket 112 of the first separator plate 110 is disposed between the first and second hydrogen holes 101 and 102 and the reaction zone 15 in a first direction parallel to the first boundary line AR1, A sealing reinforcement 113 and a second sealing reinforcement extending parallel to the second and fourth boundary lines AR2 and AR3 between the first and second air holes 36 and 39 and the reaction zone 15, (114).

The first sealing reinforcing part 113 extends parallel to the Y axis at a constant width and extends without being interrupted except for a space between the first hydrogen passage hole 101 and the second hydrogen passage hole 102. The second sealing reinforcement 114 extends parallel to the X axis at a constant width and extends seamlessly between adjacent first air holes 36 and between adjacent second air holes 39. 2, the first and second sealing reinforcement portions 113 and 114 are indicated by two-dot chain lines. In actuality, however, the first and second sealing reinforcement portions 113 and 114 are formed in the reaction region side gasket 112, 114) and the gasket around it may not be clearly distinguished.

The cooling water region gasket 121 is laminated on the cooling water side of the first metal plate 10 except for the reaction region 15 but the hydrogen holes 101 and 102, the gates 32 and 34, the cooling water holes 103, 104, air through holes 36, 39, and insertion injection aligning through holes 47 are not closed. 3, the cooling water side gasket 121 is not stacked so as to cover the joining auxiliary through hole 45. As shown in Fig.

A rubber material is not laminated along the diagonal direction between the first and second cooling water through holes 103 and 104 and the reaction zone 15 on the cooling water side of the pair of first metal plates 10 so that the first metal plate 10 The exposed first and second cooling water flow paths 122A and 122B are provided. The cooling water supplied into the dual cell type fuel cell stack 150 (see FIG. 1) flows from the first cooling water passage hole 103 into the reaction zone 15 on the cooling water side via the first cooling water passage 122A The second cooling water passage 104 through the second cooling water flow path 122B and is discharged to the outside of the dual cell type fuel cell stack 150. [ In order to easily compare the overlapping area of the reaction gas side gasket 112 stacked on the reaction gas side of the first metal plate 10 and the cooling water side gasket 121 stacked on the side of the cooling water, 121 are represented by dotted lines.

As in the case of the reaction gas side gasket 112, the cooling water side gasket 121 of the first separator plate 110 is provided between the first and second hydrogen holes 101 and 102 and the reaction zone 15, A first sealing reinforcement 123 extending parallel to the boundary line AR1 and a second sealing reinforcement 123 extending between the first and second air holes 36 and 39 and the reaction zone 15 along the second and fourth boundary lines AR2 and AR3 And a second sealing reinforcing portion 124 extending in parallel with the first sealing reinforcing portion 124.

The first sealing reinforcing part 123 extends parallel to the Y axis with a constant width and extends without being interrupted except for a space between the first hydrogen passage hole 101 and the second hydrogen passage hole 102. The second sealing reinforcement 124 extends parallel to the X axis with a constant width and extends seamlessly between adjacent first air through holes 36 and between adjacent second air through holes 39. 3, the first and second sealing reinforcement parts 123 and 124 are indicated by chain double-dashed lines. In actuality, however, the first and second sealing reinforcement parts 123 and 124 ) And the gasket around it may not be clearly distinguished. The first and second sealing reinforcement portions 113 and 114 of the reaction gas side gasket 112 and the first and second sealing reinforcement portions 123 and 124 of the cooling water side gasket 121 are connected to the first metal plate 10 Are arranged to overlap with each other.

The cooling water side gasket 121 has a guide protrusion 125 protruding toward the reaction area 15 in a direction intersecting the first boundary line AR1 and the third boundary line AR3 of the reaction zone 15. Preferably, the guide protrusion 125 may protrude in parallel with the X-axis so as to be orthogonal to the first boundary line AR1 and the third boundary line AR3. The cooling water flowing into the reaction region 15 on the side of the cooling water through the first cooling water flow path 122A flows along the cooling water flow path 131 and flows through the reaction region 15 of the first separation plate 110, 2) of the separator 130 (see FIG. 5) of the separator 130 (see FIG. 5) and is discharged through the second cooling water flow path 122B out of the reaction regions 15 and 55. Part of the cooling water flowing into the reaction regions 15 and 55 through the first cooling water flow path 122A flows into the outer peripheral portion of the reaction region 15 of the first separation plate 110, that is, the boundary lines AR1, AR2, CR2, CR3 and CR4 of the second separator plate 130 and the periphery of the reaction region 55 of the second separator plate 130, that is, the boundary lines CR1, CR2, CR3 and CR4, It can flow through. As a result, the cooling efficiency of the dual cell type fuel cell stack 150 may be lowered.

Since the guide protrusions 125 block the cooling water flowing along the boundary line of the reaction zones 15 and 55 and change the direction of flow to the center side of the reaction zones 15 and 55, The cooling efficiency is improved in the dual cell type fuel cell stack 150 and overheating is prevented.

The connecting gasket 128 of the first separator plate 110 is integrally formed with a pair of reaction gas side gaskets 112 and a pair of cooling water side gaskets 121 stacked on the pair of first metal plates 10 And extends along the Y-axis center line CY of the gasket, connecting the pair of first metal plates 10 to each other. The first and second hydrogen dents 31 and 33 and the first and second cooling water dents 42 and 44 of the pair of first metal plates 10 are connected by the connection gasket 128, Two hydrogen holes 101 and 102 and first and second cooling water holes 103 and 104 are formed.

2, 3, and 9, the thickness TAC of the connection gasket 128 is determined by the thickness of the reaction gas side gasket 112, the thickness of the cooling water side gasket 121, 10) of the thickness (TH1). Specifically, the reaction-gas-side gasket 112 and the cooling-water-side gasket 121 are respectively disposed adjacent to the connecting gasket 128 and at the ends of the pair of first metal plates 10, that is, at the periphery of the first edge 11 A reaction gas side metal plate end gasket portion 116 and a cooling water side metal plate end gasket portion 126 which are stacked one upon the other. The reaction gas side metal plate end gasket portion 116 and the cooling water side metal plate end gasket portion 126 extend in parallel with the Y axis in the same manner as the connection gasket portion 128.

The thickness TAC of the connecting gasket 128 is determined by the thickness TAG of the reaction gas side metal sheet end gasket portion 116, the thickness TAW of the cooling gas side metal sheet end gasket portion 126, 10 is greater than the sum of the thickness TH1 of 50 to 200 mu m. The thickness TAC of the connecting gasket 128, the thickness TAG of the reaction gas side metal sheet end gasket portion 116 and the thickness TAW of the cooling gas side metal sheet end gasket portion 126 satisfy the Z axis The thickness measured in the uncompressed state in a direction parallel to the thickness direction.

5 and 6, the second separator plate 130 includes a pair of second metal plates 50, and the pair of second metal plates 50 includes a second separator plate 130 Axis and the Y-axis center line CY, which is an imaginary straight line parallel to the Y-axis. The second separator plate 130 includes a pair of second metal plates 50 and a second gasket 131 joined to and supported by the pair of second metal plates 50.

The second metal plate 50 is a plate-shaped member formed of a metal material and is a so-called 'cathode contact metal plate'. The reaction zone 55 of the second metal plate 50 in the dual cell type fuel cell stack 150 (see FIG. 1) is in face-to-face contact with the cathode electrode 156 of the membrane- One side of the second metal plate 50 shown in FIGS. 5 and 6 is the side of the reaction gas through which the air as the second reaction gas flows, and the opposite side is the side of the cooling water through which the cooling water flows. The material of the second metal plate 50 may be, for example, stainless steel, aluminum alloy steel, or nickel alloy steel.

The planar shape of the second metal plate 50 is rectangular and has first to fourth edges 51, 52, 53 and 54 orthogonal to each other. The first edge 51 and the third edge 53 are parallel to each other and extend parallel to the Y axis and the second edge 52 and the fourth edge 54 are parallel to each other and extend parallel to the X axis. A reaction zone 55 is disposed at the center of the second metal plate 50. An area 70 defined by the two-dot chain line in FIG. 6 as a region near the center of the first edge 51 is the first reaction gas manifold region, that is, the hydrogen manifold region. The hydrogen manifold region 70 is provided with first and second hydrogen dents 71 and 73 which are widened to the inside of the second metal plate 50 at the first corner 51. The first and second hydrogen dents 71 and 73 are formed by removing the metal material from the second metal plate 50. The first and second hydrogen dents 71 and 73 are virtual X- And is formed symmetrically with respect to the center line CX.

The second separator plate 130 has a pair of second metal plates 50 symmetrically arranged on one plane parallel to the XY plane so that the first corners 51 face each other. The same hydrogen dents 71 and 73 of the pair of second metal plates 50 are connected to each other one on the other so that first and second hydrogen holes 106 and 107 through which hydrogen passes in a direction parallel to the Z axis are formed.

6 (a) and 6 (b) show a pair of equally spaced corners of the three corners except for the first corner 51 formed with the pair of hydrogen dents 71 and 73, that is, regions close to the second and fourth corners 52 and 54 The pair of regions 75 and 78 defined by the two-dot chain line is provided in the second reaction gas manifold region, that is, the air manifold region. The first air manifold region 75 is provided with a plurality of first air holes 76 through which air flows in a direction parallel to the Z axis. The second air manifold region 78 is provided with a plurality of second air holes 79 through which the air passes in a direction parallel to the Z axis. The first and second air holes 76 and 79 are formed by removing the metal material from the second metal plate 50.

A plurality of gates 77 and 80 extending toward the reaction region 55 and spaced apart from each other are formed in the plurality of first air holes 76 and the plurality of second air holes 79. All the air holes 76 and the gate grooves 77 provided in the first air manifold region 75 and all the air holes 79 and the gate grooves 80 provided in the second air manifold region 78, Axis is symmetrical with respect to the X-axis center line CX.

The regions 81 and 83 defined by the two-dot chain line in FIG. 6 as regions close to both ends of the first edge 51 are the first and second cooling water manifold regions. The first cooling water manifold region 81 is a region provided at a corner between the hydrogen manifold region 70 and the first air manifold region 75 and the second cooling water manifold region 83 is a region provided at a corner between the hydrogen manifold region 70 and the first air manifold region 75, Is a region provided at a corner between the hydrogen manifold region 70 and the second air manifold region 78. [ The first cooling water manifold region 81 is provided with one first cooling water dent 82 which is worn inside the second metal plate 50 at the first corner 11, The region 83 is provided with one second cooling water dent 84 that is worn inside the second metal plate 50 at the first corner 51. The first and second cooling water dents 82 and 84 are formed by removing a metal material from the second metal plate 50. The first and second cooling water dents 82 and 84 are formed by removing a metal material, And is formed symmetrically with respect to the center line CX.

The same cooling water dents (82, 84) of the pair of second metal plates (50) are connected one-to-one with each other in the second separator plate (130) so that the cooling water flows through the first and second cooling water holes (108, 109) are formed.

The cathode electrode 156 (see Fig. 10) of the membrane-electrode assembly 153 (see Fig. 10) is in face-to-face contact with the reaction zone 55 on the side of the reaction gas shown in Fig. 5 and Fig. The reaction zone 55 on the reaction gas side is provided with a reaction zone 55 extending along the straight line so as to flow through the reaction zone 55 until the air introduced from the first air vent 76 is discharged into the second air vent 79 A plurality of air channels 60 are formed.

The air channel 60 has a concavo-convex cross section. The air channels 60 formed by dicing concave on the side of the reaction gas are formed on the side of the cooling water so as to be convexly protruded from the side of the cooling water, (embankment). In the reaction zone 55 on the side of the cooling water, a cooling water flow path 131 through which the cooling water flows is formed between adjacent banks. 10, the thickness TH2 of the second metal plate 50 is 80 to 120 占 퐉 and the depth DP2 of the air channel 60 is 400 to 600 占 퐉 as in the case of the first metal plate 10 .

Referring again to Figures 5 and 6, each air channel 60 extends in a straight line parallel to the Y axis so that the first air through hole 76 and the corresponding second air through hole 79 are the shortest paths And a straight line portion. One end 66 of each of the air channels 60 at both ends 66 and 67 near the first air passage 76 is connected to a plurality of gates 77 connected to the first air passage 76 in a one- And the other end 67 close to the second air passage 79 is located in a one-to-one correspondence with the plurality of gates 80 connected to the second air passage 79. [

When air moves from the gate 77 connected to the first air vent 76 to the one end 66 of the air channel 60, the air flows along the air channel 60 in parallel with the Y axis , And moves from the other end (67) of the air channel (60) to the gate (80) connected to the second air passage (79).

A plurality of joining auxiliary holes 85 are formed outside the reaction region 55. A plurality of bonding aids 85 are arranged in a line spaced along the boundary lines CR1, CR2, CR3 and CR4 defining the reaction zone 55 and are arranged in a line with the first and second cooling water dents 82, Regions 55. In this embodiment, However, a joint auxiliary vent hole 85 is not formed between the ends 66 and 67 of the air channel 60 and the gates 77 and 80. A second gasket (not shown) made of a rubber material is disposed on the hydrogen manifold region 70, the pair of air manifold regions 75 and 78, and the pair of cooling water manifold regions 81 and 83 of the second metal plate 50 131 are bonded. The second gasket 131 is formed by inserting and fixing the second metal plate 50 into the cavity of the injection molding metal mold (not shown) And injecting the injected resin into the cavity. When the molten resin is injected into the cavity, the molten resin is filled in the plurality of bonding auxiliary through holes 85 and hardened, so that compared with the case where the plurality of bonding auxiliary through holes 85 are not provided, 2 gasket 131, specifically, the reaction gas side gasket 132 is bonded to the second metal plate 50, the surface area becomes large. Therefore, the second gasket 131 is firmly and integrally joined to the second metal plate 50.

A plurality of insertion injection aligning through holes 87 are formed at points adjacent to the four corners of the second metal plate 50. The injection molding die for injection molding the second gasket 131 has a plurality of alignment pins (not shown) in which the plurality of insertion injection aligning through holes 87 are inserted. The second metal plate 50 is aligned with the injection molding die so that the plurality of alignment pins fit into the plurality of insertion injection aligning through holes 87 and the upper core and the lower core of the injection molding die are joined The second metal plate 50 is inserted and fixed at the correct position in the cavity of the injection molding die.

The second metal plate 50 has a shape symmetrical about an imaginary center line spaced the same distance from the first and second air manifold regions 75 and 78, that is, about the X axis center line CX. The air vent 76 and the gate 77 of the first air manifold region 75 and the air vent 79 and the gate 80 of the second air manifold region 78 are symmetrical to each other, The first cooling water dent 82 and the second cooling water dent 84 are symmetrical to each other and the first hydrogen dent 71 and the second hydrogen dent 73 are symmetrical to each other. In addition, the opposite ends 66, 67 of each air channel 60 are symmetrical to each other.

The second gasket 131 is made of a rubber material and includes a reaction gas side gasket 132 laminated on the reaction gas side surface of the pair of second metal plates 50, And a connecting gasket 138 connecting the metal plate 50 and the other metal plate 50 to each other. In FIG. 5, the second gasket 131 is hatching so that the second gasket 131 can be easily distinguished from the second metal plate 50. On the other hand, the second gasket 131 does not have a gasket corresponding to the cooling water side gasket 121 provided in the first gasket 111. Therefore, the cooling water side of the second metal plate 50 in the second separator plate 130 is exposed without the laminated portion by the rubber material.

The reaction gas side gasket 132 is stacked on the reaction gas side of the second metal plate 50 except for the reaction region 55. The hydrogen gas holes 106 and 107, the cooling water holes 108 and 109, 76, 79), the gates 77, 80, and the insertion injection aligning through holes 87 are not closed. 5 and 10, the reaction gas side gasket 132 is laminated so that the joining auxiliary through hole 85 is covered. On the other hand, reference numeral 135 denotes a portion where the side of the reaction gas of the second metal plate 50 is exposed without being laminated with the rubber member, and is provided between the hydrogen holes 106 and 107 and the reaction region 55 (see FIG. 6) Flow blocking grooves for reliably blocking the flow of air.

The boundary line defining the reaction region 55 is defined by a first boundary line CR1 near the first edge 51, a second boundary line CR2 near the second edge 52, a second boundary line CR2 near the third edge 53, 3 boundary line CR3, and a fourth boundary line CR4 close to the fourth edge 54. [ The reaction gas side gasket 132 of the second separator plate 130 is disposed between the first and the second hydrogen holes 106 and 107 and the reaction region 55 in a first direction parallel to the first boundary line CR1 A sealing reinforcement 133 and a second sealing reinforcement extending parallel to the second and fourth boundary lines CR2 and CR3 between the first and second air holes 76 and 79 and the reaction zone 55. [ (134).

The first sealing reinforcing part 133 extends parallel to the Y axis at a predetermined width and extends without being interrupted except for a space between the first hydrogen passage hole 106 and the second hydrogen passage hole 107. The second sealing reinforcement 134 extends parallel to the X axis at a constant width and extends seamlessly between adjacent first air holes 76 and between adjacent second air holes 79. 5, the first and second sealing reinforcement parts 133 and 134 are indicated by two-dot chain lines. However, in reality, the first and second sealing reinforcement parts 133 and 134 are formed in the reaction area side gasket 132, 134) and the gasket around them may not be clearly distinguished.

The connecting gasket 138 of the second separator plate 130 is integrally formed with the pair of reaction gas side gaskets 132 stacked on the pair of second metal plates 50 and the pair of second metal plates 50 ) Extending along the Y-axis center line (CY). The first and second hydrogen dents 71 and 73 and the first and second cooling water dents 82 and 84 of the pair of second metal plates 50 are connected by the connection gasket 138 to the first and second hydrogen dents 71 and 73, Two hydrogen through holes 106 and 107, and first and second cooling water through holes 108 and 109 are formed.

5 and 9, the thickness TCC of the connecting gasket 138 in the second separator plate 130 is greater than the thickness of the reaction gas side gasket 132 and the thickness TH2 of the second metal plate 50 ). Specifically, the reaction gas side metal plate end gasket 132, which overlaps with the reaction gas side gasket 132 connecting gasket 138 and overlaps the end of the pair of second metal plates 50, that is, the periphery of the first edge 51, (136). The reaction gas side metal plate end gasket portion 136 extends in parallel with the Y axis like the connection gasket portion 138.

The thickness TCC of the connecting gasket 138 is 30 to 100 μm larger than the sum of the thickness TCG of the gasket 136 at the end of the reaction gas side metal plate and the thickness TH2 of the second metal plate 50. Here, the thickness TCC of the connection gasket 138 and the thickness TCG of the gasket 136 at the end of the reaction gas side metal plate are measured in a state of being uncompressed in a direction parallel to the Z axis.

Referring to FIGS. 1 to 3, 5, 9 and 10, a pair of first metal plates 10 and a pair of second metal plates 50 in the dual cell type separator plate assembly 100 The bottom surface 20B of the hydrogen channel 20 and the bottom surface 60B of the air channel 60 are stacked closely. However, since the path of the hydrogen channel 20 is substantially orthogonal to the path of the air channel 60, the hydrogen channel bottom surface 20B and the air channel bottom surface 60B are partially in close contact with each other. The point where the hydrogen channel bottom surface 20B and the air channel bottom surface 60B are closely contacted may be bonded by, for example, brazing, adhesion, or the like. When the pair of first metal plates 10 and the pair of second metal plates 50 are in close contact with each other, the cooling water side gasket 121 of the first gasket 111 is elastically contacted with the cooling water side of the second metal plate 50 do. Accordingly, the cooling water on the side of the cooling water of the first metal plate 10 and the second metal plate 50 is supplied to the reaction areas 15 and 55, the cooling water through holes 103, 104, 108 and 109 and the cooling water flow paths 122A and 122B ), And is sealed so as not to flow out to other areas.

The first metal plate 10 and the second metal plate 50 in the regions other than the reaction regions 15 and 55 are spaced from each other by a distance corresponding to the sum of the depth DP1 of the hydrogen channel 20 and the depth DP2 of the air channel 60 And the gap is maintained by the cooling water side gasket 121 of the first separator plate 110. The thickness of the cooling water side gasket 121 is greater than the thickness of the reaction gas side gasket 112 of the first separator plate 110 and the thickness of the reaction gas side gasket 132 of the second separator plate 130. The sum of the thickness of the reaction gas side gasket 112 of the first separator 110 and the thickness of the reaction gas side gasket 132 of the second separator 130 is set to be equal to the thickness of the membrane- Respectively.

In the dual cell type fuel cell stack 150 in which a plurality of the dual cell type separator assemblies 100 are closely stacked, the first sealing reinforcement portions 113, 123, 133 of the first gasket 111 and the second gasket 131 And the second sealing reinforcing portions 114, 124, and 134 are tightly compressed in a state of being aligned in a direction parallel to the Z axis. Accordingly, in the first and second separation plates 110 and 130, the reaction areas 15 and 55 and the hydrogen holes 101, 102, 106 and 107 and the reaction areas 15 and 55 and the air holes 36 , 39, 76, and 79, the surface pressure of the first and second gaskets 111 and 131 is uniformly improved without a point where the surface pressure of the first and second gaskets 111 and 131 is locally weakened. Therefore, there is no mixing of other kinds of fluid or leakage of fluid in the fuel cell stack 150, and the reliability of the sealing performance is improved.

In the dual cell type fuel cell stack 150 in which a plurality of the dual cell type separator plates 100 are closely stacked, the thickness of the connecting gaskets 128 of the first separator plate 110 and the thickness of the metal plate end gaskets 116, 126 and the thickness TH1 of the first metal plate 10 become equal to each other. The sum of the thickness of the connecting gasket 138 of the second separator 130 and the thickness of the gasket end 136 and the thickness TH2 of the second metal plate 50 becomes equal. As a result, the connection gaskets 128, 138 are compressed more tightly than the metal plate end gasket portions 116, 126, 136. Therefore, even if the connection gaskets 128 and 138 are not laminated and supported on the first and second metal plates 10 and 50, the surface pressure of the connection gaskets 128 and 138 is lower than that of the metal plate end gasket portions 116, And the sealing performance is reliably maintained without fluid outflow at the connecting gaskets 128, 9, the two-dot chain line shown in the connection gaskets 128 and 138 exemplarily represents the upper and lower outlines of the connection gaskets 128 and 138 in a tightly compressed state.

The first gasket 111 and the second gasket 131 are formed of a rubber material and can be formed by the insertion injection method as described above. A pair of first metal plates 10 are arranged in a cavity of an injection molding die (not shown) for a first gasket for molding the first gasket 111 on a first plane parallel to the XY plane 11) (see FIG. 4) are opposed to each other, and the molten resin corresponding to the rubber material is injected into the cavity and vulcanized to form the first gasket 111. The plurality of insert injection aligning through holes 47 of the first metal plate 10 guides the first metal plate 10 to be inserted and fixed in the correct position in the cavity of the injection mold for the first gasket.

The pair of first metal plates 10 fixed in the cavity can be bent by the injection pressure and the flow pressure of the molten resin. In order to prevent this, the injection mold for the first gasket may have a projection (not shown) for supporting and holding the pair of first metal plates 10. Therefore, the reaction gas side gasket 112 and the cooling water side gasket 121 of the first separator plate 110 taken out from the injection mold for the first gasket are held in contact with the projections, The metal plate fixing grooves 117 and 127 are formed to expose the first metal plate 10 without being filled.

Similarly, a pair of second metal plates 50 are arranged in a cavity of an injection molding die (not shown) for a second gasket for molding the second gasket 131 on the first plane parallel to the XY plane (See FIG. 6) facing each other, injecting molten resin corresponding to the rubber material into the cavity and vulcanizing the second gasket 131 to form a second gasket 131. The plurality of insert injection aligning through holes 87 of the second metal plate 50 guides the second metal plate 50 to be inserted and fixed in the correct position in the cavity of the injection molding die for the second gasket.

The pair of second metal plates 50 fixed in the cavity can be bent by the injection pressure and the flow pressure of the molten resin. In order to prevent this, the injection molding die for the second gasket may have a projection (not shown) for supporting and holding the pair of second metal plates 50. Therefore, the reaction gas side gasket 132 of the second separator plate 130 taken out of the injection-molding mold for the second gasket is held in contact with the projections so as not to be filled with the rubber material, The metal plate fixing grooves 137 are formed.

Referring to FIGS. 1 to 3, 5, 7, and 8, the first hydrogen holes 101 and 106 of the first and second metal plates 10 and 50 in the dual cell type fuel cell stack 150, The first cooling water passage holes 104 and 109 and the first air passage holes 36 and 76 and the second air passage holes 39 and 39. The first and second water passage holes 102 and 107, 79 are arranged so as to be aligned on a straight line parallel to the Z axis, respectively. The first hydrogen holes 101 and 106 serve as hydrogen supply holes through which the hydrogen gas supplied to the reaction region 15 (see FIG. 4) of the reaction gas side of the first metal plate 10 passes. The second hydrogen holes 102 and 107 are formed in the first metal plate 10 so that the hydrogen gas passing through the reaction region 15 on the side of the reaction gas of the first metal plate 10 passes through the fuel cell stack 150 It becomes a through hole.

The first air vent holes 36 and 76 serve as air vent holes through which the air supplied to the reaction area 55 (see FIG. 6) of the reaction gas side of the second metal plate 50 passes. The second air holes 39 and 79 are formed in the second metal plate 50 so that the air passing through the reaction area 55 on the side of the reaction gas of the second metal plate 50 passes through the air exhaust hole . The first cooling water through holes 103 and 108 serve as cooling water supply holes through which the cooling water supplied to the reaction zones 15 and 55 on the cooling water side of the first and second metal plates 10 and 50 pass. The second cooling water through holes 104 and 109 are formed in the first and second metal plates 10 and 50 so that the cooling water passing through the reaction areas 15 and 55 on the cooling water side of the first and second metal plates 10 and 50 is discharged out of the fuel cell stack 150 It becomes a through hole for discharging cooling water passing therethrough.

The hydrogen gas supplied to the dual cell type fuel cell stack 150 is transferred from the gate 32 connected to the first hydrogen passage 101 of the first metal plate 10 to the one end 26 of the hydrogen channel 20 And flows from the other end 27 of the hydrogen channel 20 to the second hydrogen passage 102 of the first metal plate 10 through the reaction zone 15 on the reaction gas side along the hydrogen channel 20, Cell type fuel cell stack 150 through the gate 34 connected to the second hydrogen passage 102. [

7, in the dual cell type fuel cell stack 150, between the reaction gas side gasket 112 of the first separator plate 110 and the reaction gas side gasket 132 of the second separator plate 130 A film (not shown) is provided with a plurality of first channel connection apertures 158 for fluidly connecting the gates 32 and 34 and both ends 26 and 27 of the hydrogen channel 20 Can be intervened. The film on which the first flow passage connection hole 158 is formed may be connected to the membrane electrode assembly 153. Hydrogen gas may flow between the gates 33 and 34 and the opposite ends 26 and 27 of the hydrogen channel 20 through the first flow passage connection hole 158.

The air supplied to the dual cell type fuel cell stack 150 moves from the gate 77 connected to the first air vent 76 of the second metal plate 50 to the one end 66 of the air channel 60 And flows from the other end 67 of the air channel 60 to the second air through hole 79 of the second metal plate 50 Through the gate 80 to the second air vent 79, and is discharged outside the fuel cell stack.

As shown in FIG. 8, in the dual cell type fuel cell stack 150, between the reaction gas side gasket 112 of the first separator plate 110 and the reaction gas side gasket 132 of the second separator plate 130 A film having a plurality of second flow path connection holes 159 for fluidly connecting the gates 77 and 80 to both ends 66 and 67 of the air channel 60 may be interposed. The film on which the second flow path connection hole 159 is formed may be connected to the membrane electrode assembly 153. The film in which the first flow path connection hole 158 is formed and the film in which the second flow path connection hole 159 are formed may be connected to one another. Air can flow between the gates (77, 80) and the opposite ends (66, 67) of the air channel (60) through the second flow path connection hole (159).

The cooling water supplied to the dual cell type fuel cell stack 150 is led to the reaction areas 15 and 55 on the cooling water side in the first cooling water through holes 103 and 108 of the first and second metal plates 10 and 50, Flows along the cooling water flow path 131 and passes through the reaction regions 15 and 55 to the second cooling water holes 104 and 109 and is discharged to the outside of the dual cell type fuel cell stack 150.

In the meantime, the first hydrogen passage holes 101 and 106 serve as a hydrogen supply passage, the second hydrogen passage holes 102 and 107 serve as a hydrogen discharge passage, the first air passage holes 36 and 76 serve as an air supply passage, The air vent holes 39 and 79 are not fixed to the air exhaust holes, the first cooling water holes 103 and 108 are not fixed to the cooling water supply holes and the second cooling water holes 104 and 109 are not fixed to the cooling water discharge holes, It may be set to the opposite.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

10: metal plate 15: reaction area
20: hydrogen channel 112: reaction gas side gasket
121: Cooling water side gasket 113,114,123,124: Sealing reinforcement part
125: guide protrusion 128: connection gasket

Claims (8)

As a separation plate constituting the fuel cell stack,
A plate-like member formed of a metallic material, wherein one side is a side of the reaction gas through which the reaction gas flows, and the opposite side is a side of the cooling water through which the cooling water flows; a reaction zone disposed at the center; A reaction gas through hole and a plurality of cooling water holes; A reaction gas side gasket formed of a rubber material and laminated on the reaction gas side of the metal plate except for the reaction zone so as not to close the plurality of reaction gas holes and the plurality of cooling water holes; And a cooling water side gasket formed of a rubber material and laminated on the cooling water side of the metal plate except for the reaction region so as not to close the plurality of reaction gas holes and the plurality of cooling water holes. As a plate,
The metal plates are arranged in a pair,
Wherein the pair of metal plates are disposed adjacent to one plane,
The gasket integral type separator for a fuel cell may further include a connection gasket formed of a rubber material and integrally formed with the reaction gas side gasket and the cooling water side gasket laminated on the pair of metal plates to connect the pair of metal plates and,
Wherein the thickness of the connecting gasket is larger than the sum of the thickness of the reaction gas side gasket, the thickness of the cooling water side gasket, and the thickness of the metal plate. The method according to claim 1,
Wherein the cooling water side gasket further comprises a guide protrusion which protrudes toward the reaction zone side intersecting the boundary line of the reaction zone and guides the cooling water flowing along the boundary line of the reaction zone toward the center of the reaction zone. Gasket integral plate. delete The method according to claim 1,
The reaction gas side gasket and the cooling water side gasket each have a metal plate end gasket adjacent to the connection gasket and stacked on the end of the metal plate,
Wherein the thickness of the connecting gasket is 50 to 200 占 퐉 larger than the sum of the thickness of the gasket end gasket of the reaction gas side gasket, the thickness of the gasket end gasket of the cooling water side gasket, and the thickness of the metal plate. Gasket integral plate. The method according to claim 1,
Wherein the pair of metal plates are symmetrical with respect to an imaginary center line bisecting the gasket integral type separator for fuel cells,
Wherein the pair of metal plates are connected by the connection gasket so that at least a portion of the plurality of reaction holes and the plurality of cooling water holes are formed in a central portion of the gasket integral separator for fuel cells. plate. The method according to claim 1,
The reaction gas side gasket and the cooling water side gasket are formed by insert injection in which the metal plate is inserted and fixed in a mold and injection molten resin corresponding to the rubber material is injected into the mold,
Wherein the reaction gas side gasket and the cooling water side gasket are formed with grooves for fixing the metal plate which are supported by the metal plate so that the metal plate is not bent in the metal mold and the rubber material is not filled but the metal plate is exposed. Integral separator. The method according to claim 1,
A plurality of bonding auxiliary holes are formed in the metal plate outside the reaction zone,
Wherein a rubber material of the reaction gas side gasket is filled in the plurality of joining auxiliary holes so that a surface area of the reaction gas side gasket bonded to the metal plate becomes large. The method according to claim 1,
Wherein the thickness of the cooling water side gasket is larger than the thickness of the reaction gas side gasket.

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