KR101979837B1 - Independent cooling plate for fuel cell and fuel cell comprising the same - Google Patents

Abstract

The independent cooling plate for a fuel cell according to an embodiment includes a main plate including a refrigerant passage therein; And a conductive plate disposed on the main plate and formed of a material having a higher electrical conductivity than the main plate.

Description

INDUSTRIAL COOLING PLATE FOR FUEL CELL AND FUEL CELL COMPRISING THE SAME [0002]

The following description relates to a stand-alone cooling plate for a fuel cell and a fuel cell including the same.

Fuel cells have advantages such as high efficiency, environment friendly and high power density, and they are attracting much attention as promising future clean energy technologies. There are many reasons why conventional low-temperature polymer electrolyte membrane fuel cells (LT-PEMFC) are difficult to commercialize. Low-temperature polyelectrolyte membrane fuel cells require a water management system such as a humidifier, moisture trap, and the like. In addition, there is a disadvantage in that it is difficult to supply fuel and hydrogen having a low specific concentration of impurities is used, and the heat that can be obtained through operation of the low temperature polyelectrolyte membrane fuel cell is limited in the use purpose due to low arrangement temperature. As an alternative to low-temperature polyelectrolyte membrane fuel cells, research on high temperature polyelectrolyte membrane fuel cells (HT-PEMFC) has been actively conducted. High temperature polyelectrolyte membrane fuel cells can be operated without separate humidification by using polybenzimidazole (PBI) electrolyte membranes doped with phosphoric acid. Since water generated from fuel cell operation occurs in the form of vapor, separate Moisture trap is not required. In addition, performance degradation of the membrane electrode assembly (MEA) due to poisoning of CO is remarkably reduced at the operating temperature of 150 ~ 180, so that the high temperature polyelectrolyte membrane fuel cell is resistant to CO concentration of 3%. This phenomenon can minimize the CO removal process in the hydrogen reforming process. In addition, it can obtain a high arrangement temperature close to 100, and utilization of heat energy is high.

However, high-temperature polyelectrolyte membrane fuel cells still require a lot of technology development. Theoretically, the performance of a high temperature polyelectrolyte membrane fuel cell having a high electrochemical reaction rate is somewhat inferior to that of a low temperature polyelectrolyte membrane fuel cell. In addition, there are disadvantages of poor durability and short life span due to severe operating conditions such as exposure to phosphoric acid and high temperature.

For example, if a part of the fuel cell breaks down under a high temperature operating condition, the refrigerant permeates into the membrane electrode assembly (MEA), thereby deteriorating the performance of the fuel cell. Further, since the oil used as the refrigerant of the fuel cell of the high-temperature polyelectrolyte membrane fuel has a viscosity higher than that of water, the oil causes a high differential pressure on the circulation path, and this has also caused a problem of causing breakage of the fuel cell. Also, the oil used as the refrigerant of the high temperature polyelectrolyte membrane fuel cell operates at a high temperature, thus causing a volume change of the separator during circulation in the refrigerant passage formed inside the separator plate of the fuel cell, thereby promoting breakage.

It is an object of one embodiment to provide a stand-alone cooling plate for a fuel cell capable of reducing the resistance of the contact interface between the cooling plate and the separating plate.

The independent cooling plate for a fuel cell according to an embodiment includes a main plate including a refrigerant passage therein; And a conductive plate disposed on the main plate and formed of a material having a higher electrical conductivity than the main plate.

The main plate may include a longitudinal hole, and the conductive plate may be mounted to the longitudinal hole.

The main plate and the conductive plate may have the same thickness.

Wherein the conductive plate comprises: a plate body; And a coating layer coated on an outer surface of the plate body.

The independent cooling plate for the fuel cell may further include a buffer layer covering the upper surface and the lower surface of the main plate and the conductive plate.

The buffer layer may include: a first buffer covering the upper and lower surfaces of the main plate; And a second buffer part covering the top and bottom surfaces of the conductive plate and formed of a material having a higher elastic modulus than the first buffer part.

The plurality of conduction plates may be provided, and the plurality of conduction plates may be disposed parallel to each other.

The main plate includes a refrigerant inlet passage for guiding a refrigerant flowing from the outside into the refrigerant passage; And a coolant discharge passage for guiding a coolant discharged to the outside from the coolant passage.

At the optimum operating temperature of the fuel cell, the thickness of the main plate and the conductive plate are the same, and at the room temperature, the thickness of the conductive plate may be smaller than the thickness of the main plate.

Wherein the conductive plate comprises: a plate body formed of copper or brass having a higher electrical conductivity than the main plate; And a coating layer coated on the outer surface of the plate body and formed of gold having a higher electrical conductivity than the plate body.

A fuel cell according to an embodiment includes a plurality of cell units; A separate cooling plate for a fuel cell including a main plate disposed on one surface of the plurality of cell units and including a refrigerant passage therein and a conductive plate formed of a material having a higher electrical conductivity than the main plate; And a support assembly for pressing and supporting the plurality of cell units and the independent cooling plate for a fuel cell.

The conductive plate may be mounted in a longitudinal hole formed in the main plate.

The cell unit may include a plurality of separators for fuel cells.

The main plate and the conductive plate may contact the separator plate for the fuel cell, with the independent cooling plate for the fuel cell being pressed and supported by the support assembly.

The fuel cell may further include a buffer layer disposed between the cell unit and the independent cooling plate for the fuel cell.

The buffer layer may include: a first buffer covering the upper and lower surfaces of the main plate; And a second buffer part covering the top and bottom surfaces of the conductive plate and formed of a material having a higher elastic modulus than the first buffer part.

According to the independent cooling plate for a fuel cell according to an embodiment, durability can be improved by using a separate independent cooling plate independent of the separation plate, unlike the conventional case where the refrigerant passage is formed inside the separation plate of the fuel cell.

Further, according to the independent cooling plate for a fuel cell according to the embodiment, the resistance of the contact interface between the cooling plate and the separator plate can be reduced.

1 is a front view of a fuel cell according to an embodiment.
2 is a view showing a support assembly constituting a fuel cell according to an embodiment.
3 is a view showing a cell unit and a free-standing cooling plate constituting a fuel cell according to an embodiment.
4 is a top view of an end plate according to one embodiment.
5 is a top view of a first stand-alone cooling plate in accordance with one embodiment.
6 is a top view of a second stand-alone cooling plate in accordance with one embodiment.
7 is a cross-sectional view taken along II of Fig.
8 is a cross-sectional view of a stand-alone cooling plate according to an embodiment and a separator plate for a fuel cell disposed on upper and lower surfaces of a free-standing cooling plate.
FIG. 9 is a cross-sectional view showing a stand-alone cold plate having a buffer layer according to an embodiment expanding at a high temperature. FIG.
10 is a cross-sectional view of a discrete cooling plate having a buffer layer according to one embodiment.
11 is a top view of a stand-alone cooling plate according to one embodiment.
12 is a plan view of a stand-alone cooling plate according to an embodiment.

Hereinafter, embodiments will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments, detailed description of known functions and configurations incorporated herein will be omitted when it may make the best of an understanding clear.

In describing the components of the embodiment, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be " connected, " " coupled, " or " connected. &Quot;

The components included in any one embodiment and the components including common functions will be described using the same names in other embodiments. Unless otherwise stated, the description of any one embodiment may be applied to other embodiments, and a detailed description thereof will be omitted in the overlapping scope.

FIG. 1 is a front view of a fuel cell according to an embodiment, FIG. 2 is a view showing a support assembly constituting a fuel cell according to an embodiment, FIG. 3 is a cross- Fig. 3 is a view showing a stand-alone cooling plate. Fig.

FIG. 4 is a plan view of an end plate according to one embodiment, FIG. 5 is a plan view of a first independent cooling plate according to an embodiment, and FIG. 6 is a plan view of a second independent cooling plate according to an embodiment.

1 to 6, a fuel cell 10 according to an embodiment may include a support assembly 11, a cell unit 12, a cooling assembly 13, and a current collector 14 .

The support assembly 11 can support and press the plurality of cell units 12 and cooling assemblies 13. The support assembly 11 may include an end plate 110, a middle plate 111, a clamping bar 112 and a relief spring 113.

The end plates 110 are plates that are respectively fastened to both ends of the fuel cell 10 and can press other structures disposed between the two end plates 110. [ The end plate 110 includes a first refrigerant inlet port 1102 through which a first refrigerant inlet passage 132 for guiding the refrigerant flowing into the first independent refrigerant plate 131 passes, A first refrigerant discharge port 1103 through which a first refrigerant discharge passage 133 for guiding a refrigerant discharged from the first independent refrigerant discharge passage 131 passes, A second refrigerant discharge port through which the inflow passage 135 passes and a second refrigerant discharge passage 136 through which the refrigerant discharged from the second independent cooling plate 134 passes, An anode inlet port A_in for guiding hydrogen introduced into the cell unit 12, a cathode inlet port C_in for guiding air introduced into the cell unit 12, An anode discharge port A_out for guiding hydrogen discharged from the anode 12 A cathode discharge port C_out for guiding air discharged from the cell unit 12, and a clamping hole h through which the clamping bar 112 penetrates.

The end plate 110 may have a rectangular shape, for example, for optimal space utilization. In this case, the first refrigerant inlet port 1102 and the first refrigerant discharge port 1103 are formed on one side of the end plate 110 and the second refrigerant inlet port 1105 and the second refrigerant discharge port 1103 are formed on the other side, A port 1106 may be formed. For example, the first refrigerant inlet port 1102 and the first refrigerant discharge port 1103 may be disposed on opposite sides of the second refrigerant inlet port 1105 and the second refrigerant discharge port 1106 .

The plurality of clamping holes h may be disposed along the edge of the end plate 110. The clamping holes h may be arranged, for example, one for each corner portion of the end plate 110, and may be disposed at least one between the corners.

The middle end plate 111 is a plate disposed at the center of the two end plates 110, so that the fixing force can be further improved. Since the fuel cell 10 is operated at a high temperature, the degree of thermal expansion is larger than that of the low temperature PEMFC stack. Therefore, there is a high risk that the separator constituting the cell unit 12 will be damaged by thermal expansion. In order to prevent the above problems, the thickness of the separator plate can be increased. On the other hand, when the separator plate becomes thick, it is difficult to fix only the two end plates 110. In addition, by inserting the middle end plate 111 at the center, the fixing force can be improved.

The clamping bar 112 is fastened between the two end plates 110 or fastened between the respective end plates 110 and the middle end plate 111 to prevent the structures located between the two end plates 110 Can be fixed. The clamping bar 112 may be arranged to penetrate at least a portion of the arrangements located between the two end plates 110 to properly align the arrangements.

The relief spring 113 is provided at the end portion of the clamping bar 112 to apply pressure to the structures located between the two end plates 110 or between the respective end plates 110 and the middle end plates 111 Can be added. By adjusting the position and length of the relief spring 113, it is possible to apply a constant pressure distribution to the separator plate constituting the cell unit 12. [

The cell unit 12 may be constructed by stacking a plurality of separating plates. For example, the cell unit 12 may be constituted by stacking five separator plates. In an embodiment, the cell unit 12 can be understood to be a collection of separators located between two independent cooling plates 131, 134. A plurality of cell units 12 may be stacked in the vertical direction. Depending on the number of the cell units 12, the output of the entire fuel cell 10 can be determined.

Each separator plate constituting the cell unit 12 includes a hydrogen flow path through which hydrogen flows and an air flow path through which air flows, and may not include a refrigerant flow path through which the refrigerant flows. The cooling function can be performed through the cooling assembly 13 using the independent cooling plate instead of forming the refrigerant passage in the cell unit 12 as described later.

The cooling assembly 13 is for removing heat generated in the fuel cell 10 and can remove heat generated in the cell unit 12 by flowing the refrigerant in an external manifold manner. In consideration of the thickness of the separator plate constituting the cell unit 12, instead of inserting the cooling plate between the separator plates so that the fuel cell 10 is not excessively thick, the cell unit 12 composed of a plurality of separator plates Independent cooling plates 131 and 134 can be inserted into the upper and lower surfaces of the cooling plates 131 and 134, respectively.

The cooling assembly 13 includes a plurality of first independent cooling plates 131 disposed on the upper surface of the plurality of cell units 12 and a plurality of first independent cooling plates 131 guiding the refrigerant A first refrigerant discharge passage 133 for guiding the refrigerant discharged from each of the plurality of first independent cooling plates 131 and a second refrigerant discharge passage 133 for discharging the refrigerant discharged from the plurality of first independent cooling plates 131, A second refrigerant inflow passage 135 for guiding the refrigerant introduced into each of the plurality of second independent cooling plates 134 and the plurality of second independent cooling plates 134, And a second refrigerant discharge passage 136 for guiding the refrigerant discharged from the first refrigerant discharge passage 136 and the second refrigerant discharge passage 136, respectively.

In the conventional case, the refrigerant flow path is integrally formed in the interior of the separator to provide the internal manifold type cooling structure. However, the refrigerant flow path is broken due to the high temperature operation condition, and the refrigerant leaks to deteriorate performance. On the other hand, as the separation plate, a graphite plate composed of a mixture of a porous medium and an engineering plastic filling the porous medium can be used. In this case, since the high-temperature PEMFC stack uses water having a high surface tension as a refrigerant, it is not a serious problem. However, since a high boiling point oil is used as a refrigerant in a fuel cell, There is a problem that oil penetrates and seeps into the inside of the oil pan, thereby greatly deteriorating performance. However, in the case of using a stand-alone cooling plate made of a metal material having an external manifold-type cooling system and high mechanical strength so that each separator plate constituting the cell unit 12 does not include the refrigerant passage as in the embodiment, It is possible to remarkably reduce the possibility of breakage and to prevent the refrigerant from being directly introduced into the separator plate even if it is broken, so that the durability can be greatly improved.

The first independent cooling plate 131 includes a first main plate 1311 including a refrigerant passage 1319 therein and a second main plate 1311 connected to the first refrigerant inlet passage 132 and communicating with the refrigerant passage 1319, A second refrigerant discharge port 1313 connected to the first refrigerant discharge passage 133 and communicating with the refrigerant passage 1319 and a second refrigerant discharge port 1313 connected to the first refrigerant discharge passage 133, 1 conduction plate 1315. In this embodiment, The refrigerant introduced through one first refrigerant inlet passage 132 is branched into each of the first refrigerant inlet ports 1312 formed in the plurality of first independent refrigerant plates 131, It is possible to remove the heat generated in the cell unit 12 while flowing through the first refrigerant discharge port 131 and discharge the same through one of the first refrigerant discharge ports 1313 to one of the first refrigerant discharge passages 133.

The first independent cooling plate 131 may include a first protrusion that does not overlap with the cell unit 12 based on, for example, the stacking direction of the cell unit 12. The first refrigerant inlet port 1312 and the first refrigerant outlet port 1313 may be formed in the first protrusion.

The second independent cooling plate 134 includes a second main plate 1341 including a refrigerant passage 1349 therein and a second main plate 1341 connected to the second refrigerant introduction passage 135 and communicating with the refrigerant passage 1349. [ A second refrigerant discharge port 1343 connected to the second refrigerant discharge passage 136 and communicating with the refrigerant passage 1349 and a second refrigerant discharge port 1343 connected to the second refrigerant discharge passage 136, 2 conduction plate 1345. In this embodiment, The refrigerant introduced through one of the second refrigerant inlet passages 135 is branched into the respective second refrigerant inlet ports 1346 formed in the plurality of the second independent cooling plates 134, The refrigerant can be discharged into one second refrigerant discharge passage 136 through the second refrigerant discharge port 1347 while removing the heat generated in the cell unit 12 while flowing in the second refrigerant discharge port 134.

The second independent cooling plate 134 may include a second protrusion that does not overlap with the cell unit 12 based on, for example, the stacking direction of the cell unit 12. And the second refrigerant inlet port 1346 and the second refrigerant discharge port 1347 may be formed in the second protrusion. On the other hand, the second projecting portion may not overlap with the first projecting portion with respect to the stacking direction of the cell unit 12.

The first refrigerant inflow passage 132, the first refrigerant discharge passage 133, the second refrigerant inflow passage 135 and the second refrigerant discharge passage 136 are elongated along the stacking direction of the plurality of cell units 12 . The second refrigerant inlet passage 135 and the second refrigerant outlet passage 136 may be disposed on the opposite sides of the first refrigerant inlet passage 132 and the first refrigerant outlet passage 133.

According to the four external manifold-type cooling structures, the cell unit 12 can be cooled while refrigerant flows in the zigzag form on the opposite sides. Further, by providing a plurality of coolant inflow passages and a plurality of coolant outflow passages, the fluidity of the coolant can be improved as compared with the case where the coolant inflow passages and the coolant discharge passages are respectively provided one by one.

FIG. 7 is a cross-sectional view taken along line I-I of FIG. 5, and FIG. 8 is a cross-sectional view of a free-standing cooling plate according to an embodiment and a separator plate for a fuel cell disposed on upper and lower surfaces of a free- Hereinafter, the first independent cooling plate 131 will be described as a reference, and the related ordinal numbers will be omitted for convenience of explanation. It goes without saying that the description of the first independent cooling plate 131 may be applied to the second independent cooling plate 134 as it is.

7 and 8, the independent cooling plate 131 according to one embodiment includes a main plate 1311, a refrigerant inlet port 1312, a refrigerant discharge port 1313, a conductive plate 1315, 1318).

The main plate 1311 may include a refrigerant passage 1319 therein. The main plate 1311 includes a first subplate 1311a having a groove forming the upper portion 1319a of the refrigerant passage 1319 and a lower portion 1319b of the refrigerant passage 1319, And a second sub-plate 1311b having grooves for forming the grooves. Since the first sub-plate 1311a and the second sub-plate 1311b do not need to be formed with holes penetrating the inside thereof, they can be easily manufactured. The main plate 1311 may include a longitudinal hole for mounting the conductive plate 1315 therein.

The engaging member 1318 may align the first sub-plate 1311a and the second sub-plate 1311b. The engaging member 1318 can help the refrigerant passage 1319 to be formed without being staggered by aligning the upper portion 1319a and the lower portion 1319b of the refrigerant passage 1319. [

The material of the main plate 1311 may be made of a metal material having a higher strength than that of the cell unit 12 (see Fig. 1), for example, SUS metal. In this case, since the mechanical strength is higher than that of the conventional cooling plate, it is possible to prevent the cooling plate from being damaged even under high temperature operating conditions.

The conductive plate 1315 is disposed on the main plate 1311 and may be formed of a material having a higher electrical conductivity than the main plate 1311. For example, the conductive plate 1315 may be fitted in a longitudinal hole provided on the main plate 1311. [ For example, in a state in which the conductive plate 1315 is fitted in the main plate 1311, the main plate 1311 and the conductive plate 1315 can be fastened by, for example, laser welding.

The conductive plate 1315 may have the same thickness as the main plate 1311, for example. The main plate 1311 and the conducting plate 1315 can contact the adjacent cell unit 12 (see Fig. 1) when pressed by the supporting assembly 11 (see Fig. 2), respectively. The conductive plate 1315 can reduce the contact resistance between the independent cooling plate 131 and the cell unit 12. [ Conductive plate 1315 may include a plate body 1315a and a coating layer 1315b.

 The material of the plate body 1315a may be a material having a higher electrical conductivity than the main plate 1311, for example, copper or brass. The coating layer 1315b may be coated on the outer surface of the plate body 1315a to improve the conductivity of the conductive plate 1315. [ The material of the coating layer 1315b may be a material having a higher electrical conductivity than the plate body 1315a, for example, gold (Au).

FIG. 9 is a cross-sectional view showing a stand-alone cold plate having a buffer layer according to an embodiment expanding at a high temperature, and FIG. 10 is a cross-sectional view of a stand-alone cold plate having a buffer layer according to an embodiment.

9 and 10, the independent cooling plate 131 may further include a buffer layer 1317 to reduce the contact resistance with the cell unit 12 (see FIG. 1). The buffer layer 1317 may be made of a material having high conductivity and flexibility. For example, the buffer layer may be formed of one material selected from the group consisting of a gas diffusion layer (GDL), a gas diffusion layer (GDL) in which a microporous layer (MPL) is laminated, a grapole, and a metal foam.

The gas diffusion layer (GDL) may be formed of a multi-porous carbon substrate such as carbon paper or carbon cloth made of carbon fiber. The gas diffusion layer has excellent electrical conductivity and pore structure, and can reduce the contact resistance with the separator plate. The gas diffusion layer may also be formed by coating a slurry of micron-sized conductive carbon particles and drying the microporous layer (MPL). Whereby the conductivity can be improved. Grafoil is a conductive sealing material in which carbon is the material. The metal foam is, for example, a bulky member made of a thin wire made of a metal material, and means a conductive product having elasticity.

The buffer layer 1317 may cover the upper surface and the lower surface of the main plate 1311 and the conductive plate 1315. The buffer layer 1317 prevents the formation of voids between the cell unit 12 (see FIG. 1) and the free-standing cooling plate 131 even if the main plate 1311 and the conducting plate 1315 are expanded by high temperature . Since the main plate 1311 and the conductive plate 1315 are formed of different materials, the coefficients of thermal expansion may be different from each other. For example, the coefficient of thermal expansion of the conductive plate 1315 may be greater than the coefficient of thermal expansion of the conductive plate 1315. The buffer layer 1317 prevents the formation of voids between the cell unit 12 (see FIG. 1) and the free-standing cooling plate 131 even if the main plate 1311 and the conducting plate 1315 have different coefficients of expansion can do. The buffer layer 1317 may include, for example, a first buffer portion 1317a and a second buffer portion 1317b of different materials.

The first buffering part 1317a may cover the upper and lower surfaces of the main plate 1311. [ The second buffering part 1317b may cover the upper and lower surfaces of the conductive plate 1315. [ For example, the second buffer portion 1317b and the conductive plate 1315 may have upper and lower surfaces of the same size and shape. The second buffering part 1317b may be made of a material that is more flexible than the first buffering part 1317a. For example, the modulus of elasticity of the first cushioning portion 1317a may be greater than the modulus of elasticity of the second cushioning portion 1317b. The first buffering portion 1317a can secure a high electrical conductivity while efficiently accommodating the volume change of the main plate 1311 having a relatively low expansion ratio at a temperature at which the fuel cell 10 normally operates, The second buffering part 1317b can efficiently accommodate the volume change of the conductive plate 1315, which has a relatively high expansion ratio at a high temperature. The first buffering part 1317a and the second buffering part 1317b are arranged so that the electric conductivity between the independent cooling plate 131 and the cell unit 12 (see Fig. 1) And the free-standing cooling plate 131 can be prevented from being formed.

For example, at the optimum operating temperature of the fuel cell 10, for example, at 170, the main plate 1311 and the conductive plate 1315 may be formed in consideration of the difference in thermal expansion coefficient between the main plate 1311 and the conductive plate 1315, The thickness of the main plate 1311 and the thickness of the conductive plate 1315 may be formed so that the thicknesses of the main plate 1311 and the conductive plate 1315 become equal. In other words, the thickness of the conductive plate 1315 may be smaller than the thickness of the main plate 1311 at room temperature. In this case also, taking into consideration that the temperature changes during driving of the fuel cell 10, the first buffer portion 1317a and the second buffer portion 1317b, which have different elastic moduli, It may be disposed on the upper and lower surfaces of the plate 1315.

FIG. 11 is a plan view of a stand-alone cooling plate according to an embodiment, and FIG. 12 is a plan view of a stand-alone cooling plate according to an embodiment.

Referring to FIGS. 11 and 12, the independent cooling plates 231 and 331 according to an embodiment may include a plurality of conductive plates 2315 and 3315 disposed in parallel with each other. The plurality of conductive plates 2315 and 3315 may be disposed at a predetermined interval in the center of the independent cooling plates 231 and 331. As the number of the conductive plates 2315 and 3315 increases, the contact resistance between the independent cooling plates 231 and 331 and the cell unit 12 (see FIG. 1) can be reduced.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. For example, it is contemplated that the techniques described may be performed in a different order than the described methods, and / or that components of the described structures, devices, and the like may be combined or combined in other ways than the described methods, Appropriate results can be achieved even if they are replaced or replaced.

Therefore, other implementations, other embodiments and equivalents to the claims are within the scope of the following claims.

Claims (16)

A main plate having a refrigerant passage therein; And
And a conductive plate disposed on the main plate and formed of a material having a higher electrical conductivity than the main plate and spaced apart from the refrigerant passage,
Wherein the main plate includes a longitudinal hole,
Wherein the conductive plate is mounted to the longitudinal hole and the upper and lower surfaces of the conductive plate are exposed to the outside of the main plate.
delete The method according to claim 1,
Wherein the main plate and the conductive plate have the same thickness.
The method of claim 3,
Wherein the conductive plate comprises:
Plate body; And
And a coating layer coated on an outer surface of the plate body.
The method according to claim 1,
And a buffer layer covering upper and lower surfaces of the main plate and the conductive plate.
6. The method of claim 5,
In the buffer layer,
A first buffer covering the upper and lower surfaces of the main plate; And
And a second buffer part covering the upper and lower surfaces of the conductive plate and formed of a material that is more flexible than the first buffer part.
The method according to claim 1,
A plurality of the conductive plates are provided,
Wherein the plurality of conductive plates are disposed in parallel with each other.
The method according to claim 1,
Wherein,
A coolant inflow passage for guiding a coolant flowing from the outside into the coolant passage; And
And a refrigerant discharge passage for guiding a refrigerant discharged to the outside from the refrigerant passage.
The method according to claim 1,
Wherein the thickness of the conductive plate is smaller than the thickness of the main plate at room temperature.
10. The method of claim 9,
Wherein the conductive plate comprises:
A plate body formed of copper or brass having a higher electrical conductivity than the main plate; And
And a coating layer coated on the outer surface of the plate body and formed of gold having a higher electrical conductivity than the plate body.
A plurality of cell units;
An independent cooling plate for a fuel cell comprising a main plate disposed on one surface of the plurality of cell units and including a refrigerant passage therein and a conductive plate spaced from the refrigerant passage and formed of a material having a higher electrical conductivity than the main plate, ; And
And a support assembly for pressing and supporting the plurality of cell units and the independent cooling plate for a fuel cell,
Wherein the main plate includes a longitudinal hole,
Wherein the conductive plate is mounted to the longitudinal hole, and the upper and lower surfaces of the conductive plate are exposed to the outside of the main plate.
delete 12. The method of claim 11,
Wherein the cell unit includes a plurality of separators for fuel cells.
14. The method of claim 13,
Wherein the main plate and the conductive plate are in contact with the separator plate for the fuel cell, with the independent cooling plate for the fuel cell being pressed and supported by the support assembly.
◈ Claim 15 is abandoned due to registration fee. 14. The method of claim 13,
And a buffer layer disposed between the cell unit and the independent cooling plate for the fuel cell.
◈ Claim 16 is abandoned due to registration fee. 16. The method of claim 15,
In the buffer layer,
A first buffer covering the upper and lower surfaces of the main plate; And
And a second buffering portion covering the top and bottom surfaces of the conductive plate and formed of a material having a higher modulus of elasticity than that of the first buffering portion.

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