WO2018088701A1 - Separation plate for fuel cell and fuel cell using same - Google Patents

Abstract

The present invention relates to a separation plate for a fuel cell and a fuel cell comprising the same and, more specifically, can improve the efficiency and performance of the fuel cell and prevent a drying phenomenon when the fuel is operated, by forming an island-shaped pattern inside a flow path formed on a separation plate for the fuel cell so as to induce distribution of irregular flow velocity and distribution of a constant flow quantity in the flow path.

Description

Separator for fuel cell and fuel cell using same

This application claims the benefit of priority based on Korean Patent Application No. 10-2016-0151351 dated November 14, 2016 and Korean Patent Application No. 10-2017-0033061 dated March 16, 2017, and the All content disclosed in the literature is included as part of this specification.

The present invention relates to a fuel cell separator and a fuel cell using the same that can increase the efficiency of the fuel cell by changing the shape of the flow path formed in the fuel cell separator.

Fuel cell is a power generation device that converts chemical energy of fuel directly into electric energy by electrochemical reaction. It is more energy efficient than existing combustion engines and has no emission of pollutants. Very wide In other words, fuel cells are not subject to the thermodynamic limitations (Carnot efficiency) of heat engines in principle, resulting in higher power generation efficiency than existing power generation equipments, and no environmental problems with no pollution and noise. It is a high-tech energy generator that has high expectations in terms of power system operation, such as easy installation inside, which can reduce transmission and transmission facilities.

The basic concept of a fuel cell can be explained by the use of electrons generated by the reaction of hydrogen and oxygen. Hydrogen passes through the anode and oxygen passes through the cathode. Hydrogen reacts with oxygen electrochemically to generate water, generating current at the electrode. As the electrons pass through the electrolyte, direct current power is generated, which in turn generates heat. DC current is used as the power of a DC motor or converted into alternating current by an inverter. The heat generated from the fuel cell can be used to generate steam for reforming or to be used for heating and cooling. If not used, it is discharged as exhaust heat. Hydrogen, the fuel of a fuel cell, uses hydrogen produced through a process called reforming using pure hydrogen or hydrocarbons such as methane or ethanol. Pure oxygen can increase the efficiency of fuel cells, but there is a problem in that cost and weight increase due to oxygen storage. Therefore, the air contains a lot of oxygen, so the efficiency is slightly lower, but also directly use the air.

The separator of such a fuel cell has a function of maintaining the shape of the fuel cell, transferring electrons, and supplying gas. As the material of the separator, materials such as graphite and metal having electrical conductivity are used for shape maintenance and electron transfer. In the case of non-conductor, a material having electrical conductivity is applied. The gas flow path formed in a part of the separation plate is a passage through which the reactor body flows, and gas is supplied to the electrode of the electrolyte-electrode assembly located between the two separation plates through the gas flow path to generate an electrochemical reaction, thereby generating electricity.

Therefore, the separator for fuel cells must be stable in both the cathode oxidation atmosphere and the anode reduction atmosphere of the fuel cell, and must be compact to prevent mixing of each fuel gas, and have sufficient electrical conductivity.

In addition, a gas flow path must be formed in the fuel cell separation plate, and the depth, width, and pattern of the gas flow channel of the separation plate are very important for smooth gas flow.

As shown in Figure 1, the flow path of the conventional separation plate is mainly used in the straight form, in this case, there is a problem that a large amount of fuel flowing out without participating in the reaction is generated by the gas flow without circulation due to the laminar flow generation In addition, some problems were alleviated by creating a cycle of reuse of the spent fuel. However, there is a problem in that a separate device and cost are consumed in order to have a circulation cycle for fuel reuse.

Accordingly, research to improve the efficiency and performance of fuel cells by improving the flow path structure formed in the separator for fuel cells has been continued.

For example, while forming a pattern in the flow path formed in the separation plate, the separation plate (Patent Document 001) that can adjust the concentration of the fluid by adjusting the distance of each pattern, and to form an island-shaped pattern at the rear end of the flow path A fuel cell separator (patent document 002) has been developed that allows the formation of vortices when passing through a fluid. However, as the requirements for fuel cell efficiency and performance become higher, the flow path of the separator plate for fuel cells is higher. Precise structural improvement is needed.

[Preceding technical literature]

[Patent Documents]

(Patent Document 1) Korean Unexamined Patent Publication No. 2014-0078904, "Solid Oxide Fuel Cell Having Vertical and Lateral Channels"

(Patent Document 2) Korean Unexamined Patent Publication No. 2010-0082501, "Separation plate for fuel cell with improved flow structure and fuel cell using the same"

The inventors have conducted various studies to solve the above problems, and as a result, when an island-shaped pattern is formed in the flow path in a fuel cell separator formed with a flow path, irregular flow velocity distribution of the fluid in the flow path is formed. And by inducing a uniform flow rate distribution to improve the efficiency of the fuel cell, it was confirmed that the drying of the membrane during low-humidity operation to complete the present invention.

Accordingly, it is an object of the present invention to provide a separator for a fuel cell having a flow path structure capable of improving the efficiency of a fuel cell by irregular flow rate distribution and uniform flow rate distribution in the flow path.

Another object of the present invention is to provide a fuel cell including a separator having an improved flow path structure.

In order to achieve the above object, in the separation plate for a fuel cell formed with a flow path comprising a transverse channel and a longitudinal channel,

It includes a first pattern and a second pattern arranged alternately spaced in the transverse channel,

The first pattern and the second pattern is a three-dimensional structure of a columnar cross-section polygonal,

The first pattern and the second pattern are arranged such that the cross section is rotated by 180 ° to each other,

Provided is a separator for a fuel cell, characterized in that the distance from which the first pattern and the second pattern are spaced apart from the side wall of the transverse channel, respectively.

In this case, the first pattern is different from the distance from each side wall of the transverse channel, respectively,

The second pattern is a separation plate for a fuel cell, characterized in that different distances from both side walls of the transverse channel.

The polygon may be at least one selected from a trapezoid, a triangle, a parallelogram, a rectangle, a pentagon, and a hexagon.

In addition, the present invention provides a fuel cell including the separator.

As the flow path structure is improved by the pattern arrangement formed on the separator plate for fuel cells according to the present invention, the flow rate is uniformly distributed while the flow rate is uniformly maintained throughout the flow path, thereby improving the performance and efficiency of the fuel cell.

In other words, a wide cross-sectional flow passage and a narrow cross-sectional flow passage are distributed together, and the pressure increases at the point where the cross-sectional flow passage enters the narrow passage improves the efficiency of the fuel cell. Turbulence is generated and the concentration of fuel can be uniformly mixed to improve performance.

In addition, when the pattern formed in the flow path is a columnar three-dimensional structure having a trapezoidal cross section, water droplets, which may be stagnant due to the slow flow rate in the flow path having a large cross-sectional area, meet a high flow rate as they ride on the trapezoidal slope, through the wide flow path. It is discharged, and part of it is formed in the flow path, so that drying of the membrane can be prevented during low-humidity operation of the fuel cell.

1 is a schematic diagram of a flow path formed in a separator for a fuel cell according to the prior art.

2 is a schematic view of a flow path formed in the separator plate for a fuel cell according to the present invention.

Figure 3 is a schematic diagram showing the shape of the flow path that can be formed in the separator for fuel cell according to the present invention.

4 is a schematic view showing a pattern in which the pattern is arranged in the transverse channel of the flow path in the separator plate for a fuel cell according to the present invention.

5 is a schematic view of a flow path formed in the separator according to the first embodiment, a perspective view (a) of the fuel cell separator and a flow diagram (b) when the first and second separators have a trapezoidal cross section. .

6 is a schematic view of a flow path formed in the separator according to the second embodiment, a perspective view (a) of the fuel cell separator and a flow diagram (b) when the first and second separators are columnar having a triangular cross section. .

7 is a schematic view of a flow path formed in the separator according to the third embodiment, a perspective view (a) of the fuel cell separator and a flow path (b) in the case where the first and second separators are columnar having a parallelogram cross section. to be.

8 is a schematic view of a flow path formed in the separator according to Comparative Example 1. FIG.

9 is a schematic view of a flow path formed in the separator according to Comparative Example 2. FIG.

10A to 10C illustrate CFD analysis results of flow paths formed in the separator for a fuel cell according to Example 1;

11A and 11B are results of Computational Fluid Dynamics (CFD) analysis of a flow path formed in a separator for a fuel cell according to Example 2. FIG.

12A and 12B show CFD analysis results of flow paths formed in the separator for a fuel cell according to Example 3. FIG.

FIG. 13 is a CFD analysis result of a flow path formed in the separator for fuel cell according to Comparative Example 1. FIG.

14 is a CFD analysis result of a flow path formed in the separator for fuel cell according to Comparative Example 2. FIG.

FIG. 15 is a graph illustrating a correlation between current density and cell voltage of separator plates for fuel cells of Example 1 and Comparative Example 1. FIG.

Hereinafter, the present invention will be described in more detail to aid in understanding the present invention.

The terms or words used in this specification and claims are not to be construed as limiting in their usual or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

As used herein, the term 'lateral channel' refers to a straight channel formed in the transverse direction in the flow path, and the 'vertical channel' refers to a straight channel formed in the longitudinal direction.

As used herein, the term "side wall" means a wall surface of both sides of a straight flow path.

Separator for Fuel Cell

2 is a schematic view of a flow path formed in the separator plate for a fuel cell according to the present invention.

As shown in FIG. 2, the present invention relates to a separator 1 for a fuel cell in which a flow path 100 including a transverse channel 110 and a longitudinal channel 120 is formed. And a first pattern 141 and a second pattern 142 that are alternately spaced apart from each other in the transverse channel 110, wherein the first pattern 141 and the second pattern 142 have a polygonal cross section. It is a three-dimensional structure of the shape, the first pattern 141 and the second pattern 142 is arranged so that the cross-section is rotated by 180 ° to each other, the first pattern 141 and from the side wall of the transverse channel 110 The separation plate 1 for a fuel cell is characterized in that the distance from which the second pattern 142 is separated from each other is different.

Figure 3 is a schematic diagram showing the shape of the flow path that can be formed in the separator for fuel cell according to the present invention.

The flow path 100 of the separator plate 1 for a fuel cell may have a shape including a horizontal channel 110 and a vertical channel 120. Specifically, a serpentine (FIG. 3A), a pod It may be one or more selected from an intergrated (b) of FIG. 3 and a parallel (c) of FIG. 3.

In the horizontal channel 110 of the flow path 100, island-shaped first patterns 141 and second patterns 142 may be alternately spaced apart at regular intervals.

In addition, a columnar pattern having a rectangular cross section may be formed in the vertical channel 120.

The first pattern 141 and the second pattern 142 are columnar three-dimensional structures having a polygonal cross section, and the cross section of the polygon may be one of a trapezoid, a triangle, a rectangle, a pentagon, and a hexagon, and the first pattern ( Considering the irregular flow rate distribution and the uniform flow rate distribution in the flow path 100 by the second pattern 142 and 142, the cross section of the polygon is preferably trapezoidal.

The width of such polygons can be from 0.1 mm to 5 mm, and the height can be from 0.1 mm to 5 mm. If the width and height are less than the lower limit, it is impossible to process, which can increase the cost burden for manufacturing a practically usable fuel cell.If the size is larger than the upper limit, a large polygon can provide efficient fuel transfer between the flow path and the electrolyte membrane. As a result, the practicality may be reduced.

FIG. 4 is a schematic view showing a pattern in which a pattern is arranged in a transverse channel of a flow path in the separator plate for a fuel cell according to the present invention, wherein the cross section of the pattern is trapezoidal.

As shown in FIG. 4, the first pattern 141 and the second pattern 142 may be arranged to be spaced apart from each other by a distance between the patterns Dw at a predetermined interval inside the flow path 100.

The first pattern 141 and the second pattern 142 may be a three-dimensional structure having the same size and shape, or when arranged in the flow path 100 may be arranged to be rotated by 180 ° to each other, a polygon as described above By alternately arranged so as to be rotated 180 ° to each other, it is possible to provide an irregular flow rate distribution, a constant flow rate distribution to provide a fuel cell separation plate that can improve the performance and efficiency of the fuel cell.

The first pattern 141 and the second pattern 142 may be arranged to be spaced apart from both sidewalls 130 of the horizontal channel 110 in the horizontal channel 110, respectively. In this case, both sidewalls 130 of the lateral channel 110 are referred to as a first sidewall 131 and a second sidewall 132, respectively.

In the first pattern 141, the distance between the first pattern 141 and the first sidewall 131 of the lateral channel 110 is referred to as a first pattern separation distance 1 (1a) and the first pattern 141. ) And the distance between the second sidewall 132 of the flow path 100 is referred to as a first pattern separation distance 2 (1b). In this case, the separation distance refers to a straight line which is the shortest distance between the pattern and the sidewall 130 of the lateral channel 110 of the flow path 100.

Further, in the second pattern 142, the distance between the second pattern 142 and the first wall surface 101w of the flow path 100 is referred to as a second pattern separation distance 1 (2a), and the second pattern ( The distance between the 142 and the second sidewall 132 of the flow path 100 is referred to as a second pattern separation distance 2 (2b).

In the first pattern 141, the first pattern separation distance 1 (1a) and the first pattern separation distance 2 (1b) are different, and in the second pattern 142, the second pattern separation distance 1 (2a) and the second pattern The separation distance 2 (b) is different.

In the first pattern 141, as the distances 1a and 1b spaced apart from both sidewalls 131 and 132 of the horizontal channel 130 are different from each other, the first pattern 141 is formed in the channel 100 horizontal channel ( 130 is not located at the center, and thus, the cross-sectional area of the two flow paths formed on both sides of the first pattern 141 is different, and thus the flow velocity is different.

Also in the second pattern 142, as the distances 2a and 2b spaced apart from both sidewalls 131 and 132 of the lateral channel 130 are different, the second pattern 141 is centered in the flow path 100. Since the cross-sectional area of the two flow paths formed on both sides of the second pattern 142 is different from each other, the flow rate is different.

In addition, the first pattern separation distance 1 (1a) and the second pattern separation distance 1 (the distance from which the first pattern 141 and the second pattern 142 are separated from the first sidewall 131 of the flow path 100, respectively) 2a) is different, and the first pattern separation distance 2 (1b) and the second pattern separation distance 2 (2b), which are distances from the second sidewall 132, are also different.

Due to the difference in distance between the first pattern 141 and the second pattern 142 from the first sidewall 131 of the transverse channel 130 of the flow path 100, a flow path having a different cross-sectional area may be formed.

For example, at the point where the fluid flows from the large cross-sectional flow passage to the small cross-sectional flow passage, a bottleneck area is formed where local pressure is generated and turbulence occurs, and the high pressure in the bottleneck area can improve the efficiency of the fuel cell. .

On the contrary, at the point where the fluid flows from the small cross-sectional flow passage to the large cross-sectional flow passage, a confluence zone in which turbulence occurs due to the difference in the flow direction of the fluid is formed, and the turbulence can play a role of mixing the fuel concentration uniformly. have.

In addition, when water is generated while the fluid is flowing, most of the cross-sectional area is discharged into a large flow path and forms a part in a narrow area, thereby preventing drying of the separator plate during low-humidity operation of the fuel cell.

The present invention also provides a fuel cell comprising the separator for the fuel cell.

The fuel cell including the fuel cell separator may have a nonuniform flow velocity distribution and uniform flow rate due to the pattern shape of the passage formed on the separator, thereby improving efficiency and performance, and operating in low-humidity conditions. Even drying can be prevented.

Hereinafter, preferred examples are provided to help the understanding of the present invention, but the following examples are merely for exemplifying the present invention, and various changes and modifications within the scope and spirit of the present invention are apparent to those skilled in the art. No wonder the changes and modifications are within the scope of the appended claims.

Specific shapes and sizes of the flow paths formed in the separator plates for fuel cells of Examples and Comparative Examples are as described in Table 1.

	Example 1	Example 2	Example 3	Comparative Example 1	Comparative Example 2
Euro	Howitzer	Howitzer	Howitzer	Howitzer	Howitzer
Presence or absence of a pattern in the flow path	U	U	U	radish	U
Cross section of the pattern	Trapezoid	triangle	Parallelogram	-	Trapezoid
Shape of the first and second pattern	Cross sections of the pattern are the same as rotated 180 ° to each other	Cross sections of the pattern are the same as rotated 180 ° to each other	Cross sections of the pattern are the same as rotated 180 ° to each other	-	Cross sections of the pattern are the same as rotated 180 ° to each other
First pattern tooth distance 1 (1a)	500 μm	500 μm	500 μm	-	750 μm
1st pattern separation distance 2 (1b)	1000 μm	1000 μm	1000 μm	-	750 μm
2nd pattern separation distance 1 (2a)	1000 μm	1000 μm	1000 μm	-	750 μm
2nd pattern separation distance 2 (2b)	500 μm	500 μm	500 μm	-	750 μm
Distance between patterns (Dw)	700 μm	700 μm	700 μm	-	700 μm

Example  1: Separation plate for fuel cell in which a columnar pattern having a trapezoidal cross section is arranged at regular intervals in the center of the passage.

As shown in FIG. 5, a fuel cell separation plate having a pattern formed in the flow path was prepared, (a) is a perspective view of the separation plate for fuel cell, and (b) is a schematic view of the flow path formed in the separation plate.

In the fuel cell separator 1 in which a straight flow path is formed in an curved shape, columnar patterns having a trapezoidal cross section are arranged at regular intervals in the transverse channel 110 of the flow path 100, and two adjacent patterns, that is, The first pattern 141 and the second pattern 142 are arranged such that the cross sections are rotated 180 ° from each other.

As shown in Table 1, the first pattern spacing distance 1 (the first pattern 141 is a distance spaced from the first side wall 131 and the second side wall 132 of the flow channel 100, the transverse channel 110, respectively) 1 a) and the first pattern separation distance 2 (1 b) are 50 μm and 1000 μm, and the second pattern 142 is formed from the first sidewall 131 and the second sidewall 132 of the channel 100 transverse channel 110. The second pattern separation distance 1 (2a) and the second pattern separation distance 2 (2b), which are spaced apart from each other, are 1000 μm and 50 μm, respectively, and the distance between the two adjacent patterns Dw is 700 μm.

Example  2: Separation plate for fuel cell in which columnar patterns having a triangular cross section are arranged at regular intervals in the center of the passage.

A fuel cell separation plate having the same shape as in Example 1 but having a triangle formed instead of a trapezoid was prepared.

6 is a schematic view of a flow path formed in the separator according to the second embodiment, a perspective view (a) of the fuel cell separator and a flow diagram (b) when the first and second separators are columnar having a triangular cross section. .

Example  3: Separation plate for fuel cell in which columnar patterns having a triangular cross section are arranged at regular intervals in the center of the passage.

A fuel cell separation plate having the same shape as in Example 1 but having a parallelogram instead of a trapezoidal pattern formed in the flow path was prepared.

7 is a schematic view of a flow path formed in the separator according to the third embodiment, a perspective view (a) of the fuel cell separator and a flow path (b) in the case where the first and second separators are columnar having a parallelogram cross section. to be.

Comparative Example 1: Separation Plate for Fuel Cell Formed with Straight Passage Curve

As shown in FIG. 8, a separator for a fuel cell in which a straight flow path is formed in an curved shape was prepared.

Comparative example  2: Separation plate for fuel cell in which columnar patterns having a trapezoidal cross section are arranged at regular intervals in the center of the passage.

As shown in FIG. 9, a fuel cell separation plate formed by arranging patterns in the center of the flow path was prepared, (a) is a schematic diagram of a fuel cell separation plate, and (b) is a schematic diagram of a flow path formed in the separation plate.

A separator for a fuel cell including a flow path 100 in which the first pattern 141 and the second pattern 142 are arranged in the same shape as in the first embodiment, except that the first pattern 141 and the second pattern 142 are provided. ) Is arranged in the center of the flow path (100).

That is, as shown in Table 1, the first pattern 141 and the second pattern 142 are spaced apart from the first side wall 131 and the second side wall 132 of the flow channel 100, the transverse channel 110, respectively. The first pattern separation distance 1 (1a), the first pattern separation distance 2 (1b), the second pattern separation distance 1 (2a), and the second pattern separation distance 2 (2b), which are distances, are all equal to 750 µm The separation distance Dw between the two patterns is 700 µm.

Experimental Example 1: CFD (Computational Fluid Dynamics) Analysis

CFD analysis was performed on the separator plates for fuel cells of Examples 1 to 3 and Comparative Example 1 to analyze the streamline shape and the flow rate distribution according to the flow path shape.

10A to 10C illustrate CFD analysis results of flow paths formed in a separator for a fuel cell according to Example 1 of the present invention.

10A illustrates a flow rate distribution in a flow path formed in a fuel cell separator. In the fuel cell separator according to Embodiment 1, flow paths having different cross-sectional areas are formed by arranging first and second patterns in the flow passage. It can be seen that vortices occur at intersections A and B where flow paths having different cross-sectional areas meet. As vortices occur in the flow path, an improvement in flow characteristics can be expected.

10B illustrates the flow rate distribution in the flow path formed in the separator for fuel cell. In the fuel cell separator according to the first embodiment, flow paths having different cross-sectional areas are formed by arranging the first and second patterns in the flow path. It is understood that the flow velocity is high in the small cross-sectional flow path and the flow velocity is small in the flow-path having a large cross-sectional area, thus exhibiting a non-uniform flow velocity distribution throughout the flow path.

In addition, FIG. 10C illustrates the flow rate distribution in the flow path formed in the separator for fuel cell in more detail. The flow rate is faster in the flow path F1 having a smaller cross-sectional area, and the flow velocity is relatively higher in the flow path F2 having a larger cross-sectional area. This slow, but trapezoidal hypotenuse of the patterns showed that the flow of the fluid was concentrated and the flow rate was increased.In order to show a uniform flow distribution throughout the flow path, the parts with the high flow rate could be alternated on both sides of the pattern. You can arrange the patterns. In addition, water droplets that may be stagnant due to the slow flow rate in the flow path F3 formed between the patterns flow along the hypotenuse of the trapezoidal cross-section due to gravity, and when a high flow rate is encountered, the water flows quickly in the flow direction to be discharged. Can be. In other words, when water is generated in the flow path, most of the water is discharged through the wide flow path, and some are formed in the narrow flow path, thereby preventing drying of the separator plate during low-humidity operation of the fuel cell.

11A and 11B illustrate CFD analysis results of flow paths formed in the separator for a fuel cell according to Example 2. FIG.

Referring to FIGS. 11A and 11B, the triangular pattern of Example 2 has a tendency to decrease the average flow rate of the entire flow path since the area of the individual patterns is relatively reduced compared to the trapezoidal pattern of Example 1. FIG. However, as in the first embodiment, it can be seen that flow paths having different cross-sectional areas are formed due to the arrangement of the triangular patterns in the flow path, and vortices due to turbulence and flow velocity change occur at the points where the flow paths having different cross-sectional areas meet. As vortices occur in the flow path, an improvement in flow characteristics can be expected.

12A and 12B show CFD analysis results of flow paths formed in the separator for a fuel cell according to Example 3. FIG.

12A and 12B, since the parallelogram pattern of Example 3 increases the area of the individual pattern relative to the trapezoidal pattern of Example 1, the average flow velocity tends to increase throughout the flow path. However, as in Embodiment 1, it can be seen that due to the arrangement of parallelogram patterns in the flow path, flow paths having different cross-sectional areas are formed, and vortices due to turbulence and flow velocity change occur at the points where the flow paths having different cross-sectional areas meet. As vortices occur in the flow path, an improvement in flow characteristics can be expected.

FIG. 13 is a CFD analysis result of the flow path formed in the separator for fuel cell according to Comparative Example 1, and FIG. 14 is a CFD analysis result of the flow path formed in the separator for fuel cell according to Comparative Example 2. FIG.

As shown in FIG. 13, in the straight flow path formed in the separator for fuel cell according to Comparative Example 1, the flow rate was constant and the vortex did not occur as a whole.

In addition, as shown in FIG. 14, the flow path formed in the separator for fuel cell according to Comparative Example 2 has a laminar flow in the flow path formed on both sides of the patterns, so that there is no change in flow velocity on the same streamline. It can be seen that it does not appear.

As such, according to the flow analysis for the separator plates for fuel cells according to the first to third embodiments, when the patterns are arranged inside the flow path so that the distance between the pattern and the wall surface of the flow path is repeatedly different, that is, different When the flow passage having a cross-sectional area is repeated, it can be seen that if there is a hypotenuse that leads to a small cross-sectional area in a wide cross-sectional flow path, vortices are generated and an effect of improving flow characteristics can be expected.

Experimental Example 2: Correlation between Current Density and Cell Voltage

The correlation between the current density and the cell voltage of the fuel cell separators of Example 1 and Comparative Example 1 was measured.

FIG. 15 is a graph (I-V Curve) showing a correlation between current density and cell voltage of the separator plates for fuel cells of Example 1 and Comparative Example 1. FIG.

As shown in FIG. 15, it can be seen that in the separator plates for fuel cells of Example 1 and Comparative Example 1, the voltage decreases as the current density increases. As the current density increases, the difference in voltage drop is known as a phenomenon due to mass transfer of oxygen and hydrogen when generating a large amount of current.

Therefore, in the case of Example 1, it can be seen that the voltage drop phenomenon due to the material movement is significantly improved compared to Comparative Example 1.

Table 1 below shows the results of measuring the current cell density at specific cell voltages, that is, 0.6 V and 0.7 V, for the separator plates for fuel cells of Example 1 and Comparative Example 1.

Cell Voltage	Example 1	Comparative Example 1
Open-circuit voltage (OCV)	0.94 V	0.942 V
@ 0.6 V	1,346 (mA / ㎠)	1,134 (mA / ㎠)
@ 0.7 V	678 (mA / ㎠)	631 (mA / ㎠)

As shown in Table 1, when the cell voltage is 0.6 V and 0.7 V, it can be seen that Example 1 showed a higher amount of current than in Comparative Example 1, whereby Example 1 is more than Comparative Example 1 It can be seen that it shows high efficiency and power.

[Description of the code]

1: Separator for fuel cell

100: Euro

110: transverse channel

120: vertical channel

130: sidewall

131: first sidewall

132: second sidewall

140: pattern

141: first pattern

142: second pattern

1a: first pattern separation distance 1

1b: first pattern separation distance 2

2a: second pattern separation distance 1

2b: second pattern separation distance 2

Claims (5)

1. In the separator for a fuel cell in which a flow path including a transverse channel and a longitudinal channel is formed,

   It includes a first pattern and a second pattern arranged alternately spaced in the transverse channel,

   The first pattern and the second pattern is a three-dimensional structure of a columnar cross-section polygonal,

   The first pattern and the second pattern are arranged such that the cross section is rotated by 180 ° to each other,

   A separation plate for a fuel cell, the distance from which the first pattern and the second pattern are respectively separated from the sidewall of the lateral channel is different.
2. The method of claim 1,

   The first patterns have different distances from both sidewalls of the transverse channel, respectively,

   The second pattern is a separation plate for a fuel cell, the distance from each of both side walls of the transverse channel is different.
3. The method of claim 1,

   Wherein the polygon is one or more selected from trapezoidal, triangular, parallelogram, quadrilateral, pentagon and hexagon, fuel cell separator.
4. The method of claim 1,

   The flow path is at least one selected from serpentine, intergrated and parallel, parallel separators for fuel cells.
5. A fuel cell comprising the separator for fuel cell according to any one of claims 1 to 4.

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