KR102025750B1 - Fuel cell separator for and the fuel cell stack having the same - Google Patents

Abstract

The present invention relates to a fuel cell separator and a fuel cell stack comprising the same. More particularly, the present invention relates to a fuel cell separator for enhancing flatness. The fuel cell separator according to the present invention can enhance flatness by a deformation preventing unit protruding convexly to one side of a plate, thereby preventing distortion due to temperature change and preventing contact failure or destruction. In addition, the present invention can provide a fuel cell stack enhanced in overall performance by comprising the separator.

Description

Fuel cell separator and and fuel cell stack comprising same {Fuel cell separator for and the fuel cell stack having the same}

The present invention relates to a fuel cell separator and a fuel cell stack including the same, and more particularly, to a fuel cell separator for improving flatness and a fuel cell stack including the same.

Fuel cell is said to be the most efficient energy conversion device that is the most efficient in producing electricity by using eco-friendly fuel such as hydrogen, and it will be the core technology of future society. Meanwhile, even at the present time when fossil fuels are used as energy sources and energy storage media, fuel cells as highly efficient and eco-friendly energy conversion devices have various fields of application and are currently being researched for commercialization in various countries around the world for energy saving and other special purposes. Is actively underway.

A fuel cell is an energy conversion device that converts chemical energy by oxidation and reduction of reactants into electrical energy. Referring to FIG. 1, when looking at the configuration of the fuel cell stack 1, an electrode membrane assembly (MEA) is located at the innermost side, and the electrode membrane assembly may move hydrogen cations. It consists of a polymer electrolyte membrane 2 and a catalyst layer coated on both surfaces of the electrolyte membrane 2 such that hydrogen and oxygen can react, that is, the air electrode 4 and the fuel electrode 6.

In addition, a gas diffusion layer 8 (GDL: Gas Diffusion Layer) is stacked on an outer portion of the electrode film, that is, an outer portion where the air electrode 4 and the fuel electrode 6 are positioned, and a fuel is provided outside the gas diffusion layer 8. A separator 10 having a flow field is formed to supply and discharge water generated by the reaction, with a gasket 9 interposed therebetween, and at the outermost end for supporting and fixing the above components. The plate is joined.

Accordingly, in the fuel electrode stack 6 of the fuel cell stack, oxidation of hydrogen proceeds to generate hydrogen ions (Proton) and electrons (Electron), and the generated hydrogen ions and electrons are electrolyte membrane (2) and separation membrane, respectively. Is moved to the cathode 4 through the electrochemical reaction of hydrogen ions, electrons and oxygen in the air, which are moved from the fuel electrode 6, from the flow of electrons. It generates electrical energy.

On the other hand, the separation plate 10 is generally manufactured in a structure in which a land (closed) in close contact with the gas diffusion layer 8 and a channel (flow path) serving as a flow path of the fluid are formed repeatedly.

That is, the general separation plate 10 has a structure in which the land and the channel (euro) are repeatedly curved, so that the channel on one side facing the gas diffusion layer 8 is used as a space in which a reactor such as hydrogen or air flows. At the same time, the opposite channel is used as a space for the coolant to flow, and thus, a total of two separation plates including one separator plate 10 having a hydrogen / coolant channel and one separator plate 10 having an air / coolant channel ( 10) one unit cell can be configured (see FIG. 2).

The separator is a fuel cell core component along with the membrane electrode assembly, which is structural support of the membrane electrode assembly and the gas diffusion layer, collection and transfer of generated current, transport of reaction gas, transport and removal of reaction product, and transport of cooling water for removal of reaction heat. It is a core part of fuel cell that plays various roles.

The separator has been manufactured using a graphite-based material having excellent conductivity and chemical stability, and a composite graphite material mixed with a resin and graphite. However, the graphite-based material has a problem in that mechanical stiffness, sealability, and electrical conductivity are inferior to those of the metal-based material, and studies to replace the separator with a metal-based separator have been actively conducted.

If the separator is applied as a metal-based separator, it is possible to reduce the volume and weight of the fuel cell stack by reducing the thickness of the separator, and to manufacture by using stamping, thereby securing mass productivity. .

Until now, stainless steel, titanium alloys, aluminum alloys, and nickel alloys, which have good corrosion resistance, have been considered as candidate materials for metal separator plates. Among them, stainless steel is a separator material material due to its relatively low material cost and excellent corrosion resistance. As a lot of attention.

On the other hand, the metal separating plate is a springback phenomenon occurs during the flow path processing and the manifold portion generated by the press molding due to the use of a thin film (0.1 ~ 0.2mm) of very thin thickness. This means irregular bending, and the thinner the thickness of the metal separator, the greater the warpage.

The bending phenomenon of the separator may adversely affect obtaining the shape of the design drawing to be formed, and the two separators are not precisely joined during spot welding, but a gap is generated, which leads to a quality amount.

Therefore, when forming a metal separator, it is necessary to develop a separator capable of improving flatness so as to reduce warpage.

Korean Patent Publication No. 10-2011-0013963

In order to solve the above-mentioned problem,

An object of the present invention is to provide a fuel cell separator that can improve the flatness to reduce the warpage phenomenon during molding of the separator.

Another object of the present invention is to provide a fuel cell stack capable of improving overall performance.

In order to achieve the above object,

The invention in one embodiment,

A plate on which a reaction flow path is formed; And

A manifold formed at both sides of the plate, the hole being formed to supply and discharge fluid to and from the reaction flow path; Including;

A deformation prevention part is formed along the outer edge of the plate,

The deformation preventing part provides a fuel cell separation plate which protrudes convexly to one surface of the plate.

In another embodiment of the present invention,

A unit cell including a fuel cell separator; And

Coupling unit for coupling at least one unit cell stacked in a stack form; It provides a fuel cell stack comprising a.

The fuel cell separator according to the present invention may improve flatness by the deformation preventing part protrudingly convex to one surface of the plate.

In addition, a fuel cell stack including the separator may be provided. The fuel cell stack may prevent the reaction fluids from leaking by the separator having improved flatness, thereby providing a fuel cell stack capable of improving overall performance.

1 is a schematic diagram illustrating a configuration of a fuel cell stack.
2 is a cross-sectional view of a fuel cell stack.
3 is a plan view showing a fuel cell separator of the present invention ((a) anode separator and (b) cathode separator).
Figure 4 is a photograph for comparing the deformation of the separator plate with or without the deformation prevention in the experimental example ((a) without deformation prevention, (b) including deformation prevention).

The present invention relates to a fuel cell separator and a fuel cell stack including the same, and more particularly, to a fuel cell separator for improving flatness.

Fuel cell separator according to the present invention can improve the flatness by the deformation preventing portion protruding convexly to one side of the plate, can prevent distortion due to temperature changes, thereby preventing contact failure or breakdown, etc. It can be effective. In addition, the separator may include a fuel cell stack capable of improving overall performance.

In the present invention, a "fuel cell" is a power generation system that converts chemical energy of fuel into energy, and a fuel (for example, hydrogen gas) is supplied to an anode on an anode side, and a cathode on a cathode side is supplied to a cathode. An oxidant (for example, air) is injected and converted into electrical energy by using chemical energy generated during their reaction. This reaction process is shown in Scheme 1 or 2.

Scheme 1

Cathode: 1 / 2O ₂ + 2e ^- ↔ O ^-2

A positive electrode ^{(Anode): O -2 + H} 2 ↔ H 2 O + 2e -

Scheme 2

Cathode: 1 / 2O ₂ + 2H ⁺ → H ₂ O

A positive electrode _{(Anode): H 2 → 2H} + + 2e -

On the other hand, the fuel cell can be classified into low temperature type and high temperature type according to operating temperature and electrolyte type. The low temperature type is PEMFC (Proton Exchange Membrane Fuel Cell) mainly used in automobiles, and the high temperature type is MCFC (Molen Carbonate Fuel). Cells, solid oxide fuel cells (SOFCs), and solid oxide electrolysis cells (SOECs) using reverse reactions of SOFCs are typically used.

Fuel cells can be continuously generated while fuel (hydrogen) and oxidant are continuously injected, and fuels can be commercially valued only when the utilization rate is increased in consideration of power generation efficiency and economic efficiency.

For example, in the present invention, the fuel cell may include an air electrode and a fuel electrode as an electrolyte having oxygen ion conductivity and electrodes disposed on both surfaces thereof. As such, the fuel cell including the electrolyte, the cathode, and the anode is referred to as a unit cell. The unit cell may generate energy during the reaction by circulating an oxidant or a fuel, which is a reaction gas for the fuel cell, between the cathode and the anode.

In an embodiment of the present invention, in order to increase the production of electrical energy, a plurality of unit cells may be provided as a stack of fuel cells stacked in a stacked form by integrally combining the plurality of unit cells.

In this case, the fuel cell stack may be provided with a "fuel cell separator" of the present embodiment in order to prevent mixing of the reaction gas while electrically connecting the cathode and the anode in each unit cell.

Here, the "fuel cell separator" refers to a separator for constituting the inside of the fuel cell and performing a function such as current transfer, fuel and oxidant dispersion, and cell separation.

In addition, "flatness" means a criterion indicating the flatness of the plate of the metal separator plate, and "improved flatness" in the present invention can prevent the reduction of the warpage phenomenon during molding of the metal separator plate. It means that there is. Meanwhile, the metal separator means the fuel cell separator of the present invention.

In the present invention, "one side" means the first side, means the front surface that is the upper surface of the separation plate shown in the drawing, "other side" means the second side, the separation shown in the drawings It means the back side opposite to the upper side of the plate.

In addition, the "first direction" refers to the transverse direction, may be a horizontal direction in the x-axis direction, the "second direction" refers to the longitudinal direction, it may be a vertical direction in the y-axis direction.

In the present invention, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

In addition, it is to be understood that the accompanying drawings in the present invention are shown to be enlarged or reduced for convenience of description.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, and the same or corresponding components will be given the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted.

3 is a plan view showing a fuel cell separator of the present invention ((a) anode separator, (b) cathode separator), and FIG. 4 is a sectional view showing the structure of the fuel cell separator of the present invention.

Hereinafter, the fuel cell separator and the fuel cell stack including the same of the present invention will be described in detail with reference to FIGS. 3 to 4.

The invention in one embodiment,

A plate 100 in which the reaction flow path 110 is formed; And

A manifold 120 formed at both sides of the plate 100 and having holes formed to supply and discharge fluid to the reaction flow path 110; Including;

Deformation prevention portion 130 is formed along the outside of the plate 100,

The deformation preventing part 130 provides a fuel cell separator 10, which protrudes convexly to one surface of the plate 100.

The plate 100 may be provided as a separator plate 10 for a fuel cell. In one embodiment of the present invention, the plate 100 may be provided in the form of a thin thin metal, and may be composed of a composite separator or stainless steel material made of carbon and polymer. In particular, it may be made of a stainless steel material.

The plate 110 may be formed with a reaction unit 150 in the center, the reaction unit 150 is a reaction flow path 110 is formed as a reaction occurs, depending on the layout of the fuel cell system in the front or rear A fuel electrode channel or an air electrode channel may be formed on at least one surface.

Specifically, a separator plate in which two bipolar plates (anode separator and cathode separator) are combined as one is a reaction flow path of a fuel cell, and a hydrogen flow path and an air flow path that are independent of each other, and a coolant that cools the fuel cell during operation Make flow paths flow (not shown).

In addition, when the bipolar plates composed of two plates joined together with a membrane electrode assembly including a polymer electrolyte membrane are stacked, the unit cells of the fuel cell are stacked. After stacking, the support blocks are assembled at both ends to form a fuel cell stack. Will be produced.

On the other hand, the plate 100 according to an embodiment of the present invention is characterized in that the deformation preventing portion 130 is formed along the outer surface of the plate 100.

In one embodiment of the present invention, the "deformation preventing portion 130" is a means for improving the flatness of the metal separating plate 10, the convex protruding to one surface of the plate 100 It features.

Here, "convexly protruding to one surface of the plate" refers to a form protruding from one surface of the plate 130 to the front surface, that is, the front surface of the back surface of the plate, and may refer to an uneven form of iron. Can be.

In particular, since the deformation preventing part 130 is formed to protrude convexly toward one surface along the outer side of the plate 100, it is possible to reduce the stress concentration than when there is no deformation preventing part 130, thereby improving flatness You can.

In addition, the deformation preventing part 130 according to an embodiment of the present invention may have an average width of 2 to 7 mm. Or 3.5 to 6.5 mm, 4 to 6 mm, 4.5 to 5.8 mm or 5 to 5.7 mm.

This may increase flatness due to an increase in width protruding from one surface of the conventional art. On the other hand, when the width of the deformation prevention part 130 is less than 3 mm, the width of the deformation prevention part 130 may be difficult to form the separation plate. If the width of the deformation prevention part 130 is greater than 7 mm, the width of the deformation prevention part is too wide, so that stress is concentrated on the patterned part. Molding of the separator or warping at high temperatures may occur. Therefore, the range of the above-mentioned width is preferable.

In particular, while the width formed along the second direction, which is both sides of the plate 100, increases in flatness with respect to the second direction, which is the y-axis, as the width of the plate 100 increases.

According to one embodiment of the present invention, the deformation preventing unit 130 may be formed in a wave pattern (131).

Specifically, the wave pattern 131 is to increase the flatness of the horizontal axis, that is, the first direction, may be formed on the top and bottom of the plate 100, respectively, and may be formed to extend along the first direction. have. In this case, it is preferable that a predetermined width of each wave pattern is formed, and the width of each wave pattern may correspond to the width of the deformation preventing part described above. Specifically, it may be formed to 2 to 7 mm. Or 3.5 to 6.5 mm, 4 to 6 mm, 4.5 to 5.8 mm or 5 to 5.7 mm. Here, the width of the wave pattern 131 means an iron portion that is a protruding portion.

If the width of the wave pattern 131 is less than 2 mm, the width is too narrow, it may be difficult to form the separation plate, if it exceeds 7 mm, the width of the protruding wave pattern 131 is too wide, Stress may be concentrated in the pattern portion, which may result in distortion during molding of the separator plate or at high temperatures.

On the other hand, the wave pattern 131 may be formed on the outer front surface of the plate 100, but is formed only on the upper and lower portions of the plate to increase the flatness. Specifically, when the wave pattern 131 of the same pattern is formed on the outer front surface of the plate 100, stress is generated on the outer front surface of the plate when forming the separation plate, the distortion may occur in the center of the plate.

Accordingly, the wave pattern 131 may be formed to exclude the left / right (second direction) of the plate 100. However, the deformation prevention part 130 formed on the outer left / right of the plate 100 may be formed along the shape of the outer part of the plate.

In addition, the plate 100 according to an embodiment of the present invention may have an average thickness of 0.1 to 0.5 mm. In particular embodiments, it may be 0.1 to 0.4 mm, 0.1 to 0.3 mm or 0.1 to 0.2 mm. On the other hand, in order to prevent the thermal deformation of the plate, the thickness of the plate 100 can be made thick, but since it causes a cost increase, it is preferable to form the thickness of the plate 100 as thin as possible. However, when the thickness of the plate 100 is less than 0.1 mm, the thickness of the plate 100 may be so thin that strain stress may be concentrated in the reaction part 150, thereby causing deformation such as thermal distortion.

In addition, when the thickness of the plate 100 exceeds 0.5 mm, the thickness of the plate 100 may be so thick that the cost may increase as described above, and the thickness of the final stack may also be thick.

Plate 100 according to an embodiment of the present invention is a rectangular shape, the manifold 120 is formed on both sides of the plate 100. Specifically, the air inlet 1201 and the air outlet 1201 ′ are disposed at the corners of the plate 100. Alternatively, a hydrogen inlet 1202 and a hydrogen outlet 1202 'may be disposed.

Air is introduced through the air inlet 1201, is discharged through the air outlet 1201 ′, and hydrogen is discharged through the hydrogen inlet 1202 and the hydrogen outlet 1202 ′. Meanwhile, the air inlet 1201 and the air outlet 1201 ′ may be formed in the cathode separator plate, and the hydrogen inlet 1202 and the hydrogen outlet 1202 ′ may be formed in the anode separator plate.

In addition, a coolant inlet 1203 and a coolant outlet 1203 'may be disposed at a central portion of the air inlet 1201 and the air outlet 1201' or the hydrogen inlet 1202 and the hydrogen outlet 1202 '. Cooling water enters through the coolant inlet 1203 and exits through the coolant outlet 1203 '.

On the other hand, the plate 100 may include a reinforcement pattern 121 surrounding the manifold 120.

The reinforcement pattern 121 may be one configuration of the above-described deformation preventing unit 130, and this is also a configuration for preventing deformation of the separator.

In detail, the reinforcement pattern 121 surrounds the manifold 120 and surrounds the outer portion of the plate 100, and may extend from the above-described wave pattern 131. 100) may protrude to one surface.

Since the manifold 120 is formed at the edge of the plate 100, the reinforcement pattern is to increase the flatness of the edge of the plate 100.

In addition, in the plate 100, a gasket dam (not shown) is provided as an outer portion of the portion where the hydrogen, air, and cooling water flow paths are formed. The gasket dam may be inserted with a gasket for sealing to prevent leakage of hydrogen, air, cooling water, etc. flowing on the plate.

In addition, the plate 100 according to an embodiment of the present invention is formed with a gas inlet 140 in communication with the manifold 120, the gas outlet 140 is a plurality of extending in the first direction Two guide bars 141.

The gas entry part 140 is a space for delivering air to the reaction part 150, and the guide bar 141 is for easier delivery of air to the reaction part 150.

In addition, the plurality of guide bars 141 protrude to one surface of the plate 100, and ends and steps of neighboring guide bars 141 are formed, and the length of the guide bars 141 is increased from the inner side of the plate to the outer side. It may be formed long.

The gas access unit 140 may extend in the first direction but have a space formed therein, and a plurality of guide bars 141 may be formed in the space.

In the present specification, the plurality of guide bars 141 are referred to as a first guide bar 1411, a second guide bar 1412, and a third guide bar 1413. The number of the plurality of guide bars 141 includes a plurality, and the number is not limited.

The first guide bar 1411, the second guide bar 1412, and the third guide bar 1413 may all extend in the first direction in the space of the gas entrance 140, but may have different lengths. Can be. In detail, the length of the second guide bar 1412 may be longer than that of the first guide bar 1411, and the length of the third guide bar 1413 may be longer than that of the second guide bar 1412. . Here, the guide bar adjacent to the reaction unit 150 is referred to as a first guide bar 1411.

Meanwhile, the guide bars 1411, 1412, and 1413 may be formed on the same axis (y-axis) on one side, but the other end of the guide bar may be formed on different axes (y-axis). That is, neighboring guide bars may be stepped with each other. This is to more easily introduce hydrogen introduced into the manifold 120 into the reaction unit 150, and also to more easily discharge the reaction gas from the reaction unit into the manifold 120.

In addition, the guide bar 141 may increase the flatness of the separation plate 10 at the same time to facilitate the introduction and discharge of gas.

Specifically, as described above, the guide bar 141 is also formed to protrude to one surface of the plate 100, thereby dispersing the stress at the time of molding the separator or at a high temperature, so that the separator 10 is distorted. The phenomenon can be prevented.

In addition, the plate 100 may include a plurality of protrusion bars 151 that divide the reaction flow path 110, and the plurality of protrusion bars 151 may extend along the second direction.

At this time, the plurality of protrusion bar 151 is characterized in that arranged at 0.5 to 3 mm intervals. In this case, the plurality of protruding bars 151 may be arranged at intervals of 0.5 to 3 mm, 0.7 to 2.8 mm, 1.0 to 2.6 mm, or 2.45 mm with the protruding bars 151 adjacent to each other.

The protrusion bar 151 is for raising the flatness of the reaction part 150 which is the center of the separation plate 10, and the arrangement interval of the protrusion bar 151 is dependent on the number of protrusion bars 151 disposed. You can change it.

When the spacing of the plurality of protruding bars 151 is less than 0.5 mm, the number of the protruding bars 151 for dividing the reaction flow path 110 is arranged too much, so that the space of the reaction flow path 110 becomes too narrow to react Movement of the fluid can be difficult. In addition, since the number of the protruding bars 151 is disposed too much, stress may be concentrated in the protruding bars 151 at the time of manufacturing the separation plate or at a high temperature, such that bending may occur in the center of the plate.

On the other hand, when the spacing of the plurality of protrusion bar 151 is arranged more than 3.0 mm, the number of the protrusion bar 151 is too small to easily guide the reaction fluid, this also, the number of the protrusion bar 151 Is so small that stress is concentrated in the center of the plate, a warping phenomenon may occur.

On the other hand, the plurality of protrusion bar 151 may be formed to extend in the second direction, but may be formed of the same length, but one end of the adjacent protrusion bar 151 may be formed with each other. At the other end, a step may also be formed.

The deformation preventing part 130, the reinforcement pattern 121, the wave pattern 131, the guide bar 141, and the protruding bar 151 formed on the plate 100 may be used to improve the flatness of the separator 10. And, may be processed together during the press molding of the separation plate 10, or may be processed through a separate process after the press molding with the reaction oil inside the separation plate.

In another embodiment of the present invention,

A unit cell including a fuel cell separator; And

Coupling unit for coupling at least one unit cell stacked in a stack form; It provides a fuel cell stack comprising a.

As described above, a fuel cell composed of an electrolyte, an anode, a fuel electrode, and a fuel cell separator is called a unit cell, and the unit cell circulates an oxidant or a fuel, which is a reaction gas for a fuel cell, between the cathode and the anode to circulate energy. Can produce.

In another embodiment of the present invention, in order to increase the production of electrical energy, a plurality of unit cells may be provided as a stack of fuel cells stacked in a stacked form by integrally combining the plurality of unit cells.

That is, the fuel cell stack according to another exemplary embodiment of the present invention includes the separator 100 having improved flatness, thereby preventing abnormal operation of the fuel cell stack, and improving overall performance. This has the effect of lowering the overall height of.

Hereinafter, the present invention will be described in more detail by experimental examples.

Experimental Example

Experimental Example 1. Flatness Measurement

A fuel cell separator and a fuel cell separator including a strain preventing part were manufactured. In addition, the flatness of the two types of fuel cell separators was measured, and the results are shown in FIG. 4 ((a) without deformation prevention part and (b) with deformation prevention part).

More specifically, the separation plate was placed on the reference plane (bottom), and the height difference (h) of the four corners of the reference plane and the separation plate was measured and averaged.

As a result, the average height step h was 0.8 mm for the fuel cell separation plate a without the deformation preventing portion and 0.3 mm for the fuel cell separation plate b with the deformation preventing portion. That is, it was confirmed that the flatness of the fuel cell separation plate (b) including the deformation preventing part was smaller than that of the fuel cell separation plate (a) without the deformation preventing part (a).

In particular, referring to FIG. 4, FIG. 4 (a) shows that deformation of the fuel cell separator occurs even with the naked eye.

The fuel cell current collector and the fuel cell stack including the same according to the present invention have been described in detail above. However, this is only for describing the most preferred embodiments of the present invention, and the present invention is not limited thereto. The range is determined and defined by the range. In addition, anyone of ordinary skill in the art will be able to make various modifications and imitations according to the description of the specification of the present invention, but it will be apparent that this is also outside the scope of the present invention.

10: fuel cell separator
100: plate
110: reaction flow path
120: manifold
1201: air inlet 1201 ': air outlet
1202: hydrogen inlet 1202 ': hydrogen outlet
1203: coolant inlet 1203 'coolant outlet
121: reinforcement pattern
130: deformation preventing portion 131: wave pattern
140: gas entry part
141: guide bar
1411: first guide bar 1412: second guide bar
1413: third guide bar
150: reaction unit 151: protrusion bar

Claims (10)

A plate on which a reaction flow path is formed; And
A manifold formed at both sides of the plate, the hole being formed to supply and discharge fluid to and from the reaction flow path; Including;
A deformation prevention part is formed along the outer edge of the plate,
The deformation preventing part protrudes convexly to one surface of the plate,
The deformation prevention part is formed in a wave pattern extending along the first direction only at the upper and lower portions of the plate,
The fuel cell splitter plate, characterized in that the deformation prevention portion formed along the second direction on the outer left and right sides of the plate is excluded from the wave pattern.
delete The method of claim 1,
The protruding width of the deformation preventing part is an average of 2 to 7 mm fuel cell separator.
The method of claim 1,
The plate is
A fuel cell separator comprising a reinforcement pattern surrounding a manifold.
The method of claim 1,
The plate is
A fuel cell separator, characterized in that the average thickness of 0.1 to 0.5 mm.
The method of claim 1,
The plate is
A gas inlet communicating with the manifold is formed,
The gas outlet plate comprises a plurality of guide bars extending along the first direction.
The method of claim 6,
Multiple guide bars
Protrude to one side of the plate,
Wherein the step is formed with the end of the neighboring guide bar, the fuel cell separation plate, characterized in that the length of the guide bar is formed longer from the inside of the plate toward the outside.
The method of claim 1,
The plate is
It includes a plurality of protrusion bar to separate the reaction flow path,
A plurality of protruding bars extend along the second direction.
The method of claim 8,
Multiple protrusion bars
A fuel cell separator, characterized in that arranged at 0.5 to 4 mm intervals.
A unit cell including a fuel cell separator according to claim 1; And
Coupling unit for coupling at least one unit cell stacked in a stack form; Fuel cell stack comprising a.

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