KR100773531B1 - Monopolar membrane-electrode assembly having protruded current collector - Google Patents

Abstract

A monopolar membrane electrode assembly is provided to lower resistance, thereby increasing battery efficiency, to prevent the deformation of an electrolyte membrane, to prevent the leakage of liquid fuel and to improve the circulation of fuel. A monopolar membrane electrode assembly comprises an electrolyte membrane(110) having a plurality of cell regions; an anode support and a cathode support where a plurality of first aperture parts(114a,116a) corresponding to the cell regions and a plurality of second aperture parts(114b,116b) related with the cell regions are formed at the both surfaces of the electrolyte membrane; a plurality of anode current collectors(120) and a plurality of cathode current collectors(160) which are installed at the cell regions, respectively on the supports; a plurality of anodes(130) and a plurality of cathodes which are installed on the anode current collectors and the cathode current collectors, respectively; a current collection part which comprises a plurality of current collection lines on the cell regions so as to collect current; and a conducting part which is connected with the one side of the current collection part, wherein the terminal(162a) of the conducting part of the cathode current collectors is electrically connected in serial with the terminal(122a) of the conducting part of the anode current collectors through the second aperture, the first groove(117) corresponding to the current collection lines is formed at the each cell region of the both surfaces of the electrolyte membrane, and a first projection(127) geared with the first groove is formed at the current collection lines.

Description

Monopolar membrane-electrode assembly having protruded current collector

1 is a schematic cross-sectional view of a monopolar membrane-electrode assembly having a protruding current collector according to a first embodiment of the present invention.

2 is a plan view showing an electrolyte membrane of a fuel cell of the present invention.

3 is a plan view of the supporting body of FIG.

4 is a partial plan view showing the protrusion of the current collector.

5 and 6 are plan views showing current collectors inserted into the membrane electrode assembly of FIG. 1, respectively.

7A and 7E illustrate step by step methods of forming protrusions and grooves of the present invention.

8 is a schematic cross-sectional view of a monopolar membrane-electrode assembly having a protruding current collector according to a second embodiment of the present invention.

FIG. 9 is a plan view of the supporting body of FIG. 8. FIG.

10 and 11 are plan views illustrating current collectors inserted into the membrane electrode assembly of FIG. 8, respectively.

The present invention relates to a structure of a monopolar direct liquid fuel cell for use as a power source for a portable electronic device, and more particularly, to a monopolar membrane-electrode disposed on a catalyst and having a protruding current collector. It is about assembly.

Direct Methanol Fuel Cell (DMFC) is a power generating device that generates electricity by the reaction of methanol as fuel and oxygen as oxidant. It has very high energy density and power density, and it uses methanol directly as fuel. It does not require peripherals such as reformers and has the advantage of easy storage and supply of fuel.

Monopolar DMFC is a method of manufacturing a thin DMFC by greatly reducing the thickness and volume by arranging a plurality of cells in one electrolyte membrane and connecting each cell in series.

U.S. Patent No. 6,410,180 discloses a mesh type current collector and a conductive part connecting the current collectors to each electrode. However, the position of the current collector on the electrode causes a step between the electrode and the current collector, so that fuel may leak, and liquid fuel may leak through the conductive portion. In addition, an increase in contact resistance between the current collector and the electrode and an increase in resistance generated when electrons generated in the catalyst layer move through the fuel diffusion part and the electrode support of the electrode to the current collector may reduce the efficiency of the fuel cell. In addition, in order for the current generated in the catalyst layer to be transferred to the current collector, there was a limitation of material selection by using a material in which both the diffusion layer and the support layer were electrically conductive, and this limitation was directly related to the performance limitation of the fuel cell.

On the other hand, the electrolyte membrane that is hydration and dehydration is contracted and expanded, thereby increasing the contact resistance with the fixed electrode. Therefore, a means for fixing the electrolyte membrane and the electrode is required.

An object of the present invention is to minimize the resistance by shortening the moving distance of electrons by forming a current collector on the catalyst layer of the electrode, the current is formed by the projection to fix the electrolyte membrane or catalyst layer by forming a protrusion on the current collector It is to provide a structure of a membrane-electrode assembly having a current collector.

Another object of the present invention is to provide a fuel cell comprising the membrane-electrode assembly.

In order to achieve the above object, a monopolar membrane-electrode assembly having a protruding current collector according to an embodiment of the present invention includes:

An electrolyte membrane in which a plurality of cell regions are formed;

An anode support and a cathode support each having a plurality of first openings corresponding to the cell region and a plurality of second openings associated with the cell region on both sides of the electrolyte membrane;

A plurality of anode current collectors and a plurality of cathode current collectors respectively provided in the cell region on the support; And

And a plurality of anode electrodes and a plurality of cathode electrodes respectively provided on the anode current collector and the cathode current collector.

Each current collector includes a current collector configured to collect current by forming a plurality of current collector lines on the cell region; And

And a conductive part connected to one side of the current collector,

Corresponding terminals of the cathode current collector and the anode current collector are electrically connected in series through corresponding second openings,

Each cell region on both sides of the electrolyte membrane is formed with a first groove corresponding to the current collecting line, and the first projection is formed in the current collecting line to be engaged with the first groove.

According to an aspect of the present invention, the cathode and the anode electrode in the second groove formed to correspond to the current collector; is further formed, the current collector is a second protrusion that is engaged with the second groove Is further formed.

According to the present invention, the first protrusion and the second protrusion are formed to have a height of 20 to 50 μm.

According to the invention, the support may be made of a non-conductive polymer, it may be made of a material selected from the group consisting of polyimide, polyethylene, polypropylene, polyvinyl chloride.

According to the present invention, the support and the current collector may be a flexible printed circuit board (FPCB) formed integrally.

The current collector may be made of a metal selected from the group consisting of Ag, Au, Al, Ni, Cu, Pt, Ti, Mn, Zn, Fe, Sn, and alloys thereof.

In order to achieve the above object, a monopolar membrane-electrode assembly having a protruding current collector according to another embodiment of the present invention is:

An electrolyte membrane in which a plurality of cell regions are formed;

An anode support and a cathode support each having a plurality of first openings corresponding to the cell region on both sides of the electrolyte membrane;

A plurality of anode current collectors and a plurality of cathode current collectors respectively provided in the cell region on the support;

And a plurality of anode electrodes and a plurality of cathode electrodes respectively provided on the anode current collector and the cathode current collector.

Each current collector includes a current collector configured to collect current by forming a plurality of current collector lines on the cell region; And

And a conductive part connected to one side of the current collector,

The stage of the conductive portion of the cathode current collector and the stage of the conductive portion of the anode current collector are respectively exposed to the outside of the support, so that the stage of the conductive portion of the cathode current collector and the conductive portion of the anode current collector Electrically connected in series,

Each cell region on both sides of the electrolyte membrane is formed with a first groove corresponding to the current collecting line, and the first projection is formed in the current collecting line to be engaged with the first groove.

Hereinafter, preferred embodiments of the monopolar membrane-electrode assembly having a protruding current collector according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic cross-sectional view of a monopolar membrane-electrode assembly having a protruding current collector according to a first embodiment of the present invention, FIG. 2 is a plan view showing an electrolyte membrane of a fuel cell of the present invention, and FIG. 1 is a plan view of the supporting body of FIG. 1, FIG. 4 is a partial plan view showing the protrusion of the current collector, and FIGS. 5 and 6 are plan views showing the current collector inserted into the membrane-electrode assembly of FIG. 1, respectively. .

1 to 6, the monopolar membrane-electrode assembly 100 into which the current collector of the present invention is inserted includes a plurality of cell regions, for example, eight cell (first to eight cell) regions. An electrolyte membrane 110 is provided. Both surfaces of the electrolyte membrane 110 are provided with nonconductive supports 114 and 116, for example, polyimide films, each having a plurality of first openings 114a and 116a corresponding to the cell region.

The support bodies 114 and 116 further include second openings 114b and 116b associated with the second to seventh cell regions and the first cell region or the eighth cell region, respectively. In addition, an opening 110a corresponding to the second openings 114b and 116b may be further formed in the electrolyte membrane 110.

The anode current collectors 120 (A1 to A8) and the cathode current collectors 160 (C1 to C8) are formed on each cell region in each of the supports 114 and 316. An anode electrode 130 and a cathode electrode 170 are provided on the anode current collector 120 and the cathode current collector 160.

Each electrode 130, 370 is composed of a catalyst layer, a fuel diffusion unit, and an electrode support.

The nonconductive supports 114 and 316 may also be formed of polyethylene, polypropylene, and polyvinyl chloride.

The anode current collectors 120 (A1 to A8) and the cathode current collectors 160 (C1 to C8) may be grid metal meshes. The conductive portion 122 is formed at one side of the anode current collector 120, and the conductive portion 162 is formed at one side of the cathode current collector 160. Each current collector includes a current collector and a corresponding conductive portion.

The anode current collector 120 has a first protrusion 127 and a second protrusion 128 in the electrolyte membrane 110 and the anode electrode 130, respectively. In addition, a first groove 117 and a second groove 138 are formed on one surface of the electrolyte membrane 110 and the anode electrode 130 facing the first protrusion 127 and the second protrusion 128, respectively. have. The first protrusion 127 is engaged with the first groove 117. The second protrusion 128 is formed to engage the second groove 138. The first protrusion 127 and the second protrusion 128 prevent movement by contraction and expansion of the electrolyte membrane 110, thereby reducing contact resistance between the electrolyte membrane 110 and the electrode 130.

The first protrusion 127 and the second protrusion 128 are formed to protrude on both sides of the current collecting line 121 of the current collector 120. Referring to FIG. 4, the current collecting line 121 is formed in a mesh shape, and the first protrusion 127 and the second protrusion 128 are also formed in a mesh shape in the same manner as the current collecting line 121. The current collecting line 121 may have a line shape extending in one direction from the conductive portion 122. The first protrusion 127 and the second protrusion 128 may be formed in a line shape, or may be formed in a point shape.

The first protrusion 127 and the second protrusion 128 may vary in thickness depending on the thickness of the electrolyte membrane 110 and the electrode 130, but may be approximately 20% of the thickness of the electrolyte membrane 110. When the thickness of the electrolyte membrane 110 is approximately 50 to 200 μm, the height of the first protrusion 127 and the second protrusion 128 is preferably about 10 to 50 μm.

The cathode current collector 160 has a first protrusion 167 and a second protrusion 168 in the electrolyte membrane 110 and the cathode electrode 170, respectively. The first protrusion 167 and the second protrusion 168 are formed to protrude on both sides of the current collecting line 161 of the current collector 160. Referring to FIG. 4, the current collecting line 121 is formed in a mesh shape, and one surface and the cathode electrode 170 of the electrolyte membrane 110 facing the first protrusion 167 and the second protrusion 168. The first groove 117 and the second groove 168 are formed in each. The first protrusion 167 is engaged with the first groove 117. The second protrusion 168 is formed to be engaged with the second groove 138. The first protrusion 167 and the second protrusion 168 prevent movement of the electrolyte membrane 110 by contraction and expansion, thereby reducing contact resistance between the electrolyte membrane 110 and the electrode 170.

Since the first protrusion 167 and the second protrusion 168 may be formed in substantially the same manner as the first protrusion 127 and the second protrusion 128, a detailed description thereof will be omitted.

5 and 6 show a flexible printed circuit board (FPCB) in which a current collector made of a conductive metal is formed together on a polyimide film as the supports 114 and 116. In this case, the anode current collector and the cathode current collector may be integrally formed with the polyimide films 114 and 316, respectively, and then bonded to the electrolyte membrane 110.

The conductive parts 122 connected to the anode current collector A1 and the conductive parts 162 connected to the cathode current collector C8 are connected to terminals 124 and 364 for electrical connection to the outside, respectively. The terminals 124 and 364 may extend from the conductive portion 122 connected to the anode current collector A1 and the conductive portion 162 connected to the cathode current collector C8.

The stage 162a of the conductive portion 162 of the cathode current collector C1 of the first cell is located at the second opening 116b formed in the support 116, and the anode current collector A2 of the second cell. The stage 122a of the conductive portion 122 is located at the second opening 114b formed in the support 114. The support 116 on which the cathode current collector 160, the conductive part 162, and the terminal 164 are formed is disposed between the cathode electrode 170 and the electrolyte membrane 110, and the anode current collector 120 is disposed. The support 114 having the conductive portion 122 and the terminal 124 formed therebetween is disposed between the anode electrode 130 and the electrolyte membrane 110, and then the openings 114b and 116b formed in the supports 114 and 116 are aligned. After hot-pressing for 3 minutes at 125 ° C. and 3 ton pressure in one state, the stages 122a and 162a of the conductive parts 122 and 162 are connected to the second openings 114b and 116b and the openings 110a. Through a spot welder or ultrasonic welder (ultrasonic welder) through the electrical connection. As described above, the anode current collectors A2 to A8 of each cell are electrically connected to the cathode current collectors C1 to C7 of neighboring cells through the second openings 114b and 316b and the openings 110a. Thus, the first to eighth cells are connected in series.

The current collectors 120 and 160, the conductive parts 122 and 162, and the terminals 124 and 164 may be made of metal having an electrical conductivity of 1 S / cm or more. Ag, Au, Al, Ni, Cu, Pt, Ti, Mn, Zn, Fe, Sn and their alloys may be used as the metal, respectively. As the metal substitute, a conductive polymer such as polyaniline, polypyrrole, polythiophene, or the like may be used.

The opening 110a may not be formed in the electrolyte membrane 110. In this case, the width of the electrolyte membrane 110 may be defined inside the second opening.

When the hydrogen fuel supply unit and the oxygen (or air) supply unit are respectively provided on both sides of the membrane electrode assembly of the first embodiment, a fuel cell can be manufactured. Since such a technique is well known in the art, a detailed description thereof will be omitted.

7A and 7E illustrate step by step methods of forming the protrusions and grooves of the present invention. The same reference numerals are used for components substantially the same as the components of the first embodiment, and detailed description thereof will be omitted. As an example, the protrusions are formed in a line shape on the current collector.

Referring to FIG. 7A, a support plate 190 made of SUS material or polycarbonate material having a groove 191 having a width and depth of 10 μm at 10 mm intervals is prepared.

   An anode current collector including projections 127 and 128 made to fit into the groove 191 is mounted on the support plate 190 to fix the anode current collector to the support plate 190. The anode current collector may be an FPCB in which a current collector is inserted on a support.

Referring to FIG. 7B, a polymer solution for making an electrolyte membrane is coated on a support plate 190 on which a current collector is fixed by using a tape casting method. The coated polymer film 193 may have a thickness of 30-40 μm. Subsequently, after drying the polymer film 193 at room temperature, the support plate 190 is removed from the polymer film 193.

Referring to FIG. 7C, the catalyst PtRu slurry is coated by a tape casting method to cover the current collector on the support plate 190. The thickness of the catalyst layer can be formed to 20 ㎛. The catalyst layer 194 is dried at room temperature.

Referring to FIG. 7D, the process is repeated, but a cathode current collector is used instead of an anode current collector, and a Pt slurry is used to form the catalyst layer 195. The cathode current collector and the catalyst layer 195 are disposed on the polymer film 196.

Referring to FIG. 7E, the polymer membrane 193 including the anode current collector and the polymer membrane 196 including the cathode current collector may have a pressure of 5 ton at or above the glass temppwrature of the polymer electrolyte membrane, for example, 130 ° C. or more. Fusion.

In the above-described manufacturing method, after the grooves are formed in the electrolyte membrane by the lithography technique without using the support plate 190, the FPCB having the protrusions may be combined.

In the monopolar membrane-electrode assembly 100 according to the first embodiment, the conductive part electrically connecting the anode electrode 130 and the cathode electrode 170 is directly connected, so the length of the conductive part is very short, and thus the electrical resistance is reduced. Becomes smaller. In addition, since the current collectors 120 and 160 are installed between the electrolyte membrane 110, which is the reaction interface, and the catalyst layers of the electrodes 130 and 170, electrons generated in the catalyst layer are collected in the current collectors in direct contact with each other. Electrons pass through the fuel diffusion portion of the electrode and the electrode support, and there is no electrical resistance generated. In addition, since the protrusion fixes the electrolyte membrane 110, deformation of the electrolyte membrane 110 is prevented.

FIG. 8 is a schematic cross-sectional view of a monopolar membrane-electrode assembly having a protruding current collector in accordance with a second embodiment of the present invention, FIG. 9 is a plan view of the supporting body of FIG. 11 is a plan view illustrating a current collector inserted into the membrane electrode assembly of FIG. 8, respectively.

8 to 11, the monopolar membrane-electrode assembly 200 into which the current collector of the present invention is inserted includes a plurality of cell regions, for example, eight cell (first to eight cell) regions. An electrolyte membrane 210 is provided. Both surfaces of the electrolyte membrane 210 are provided with nonconductive supports 214 and 116, for example, polyimide films, each having a plurality of first openings 214a and 116a corresponding to the cell region.

The anode current collectors 220 (A1 to A8) and the cathode current collectors 260 (C1 to C8) are formed on each cell region in each support 214 and 316. An anode electrode 230 and a cathode electrode 270 are provided on the anode current collector 220 and the cathode current collector 260.

Each electrode 230, 370 is composed of a catalyst layer, a fuel diffusion unit, and an electrode support.

The nonconductive supports 214 and 316 may also be formed of polyethylene, polypropylene, and polyvinyl chloride.

The anode current collectors 220 (A1 to A8) and the cathode current collectors 260 (C1 to C8) may be metal grids in the form of lattice. A conductive portion 222 is formed at one side of the anode current collector 220, and a stage of the conductive portion 222 extends to be exposed to the outside of the support 214. A conductive portion 262 is formed at one side of the cathode current collector 260, and the end of the conductive portion 262 extends to be exposed to the outside of the support 216. Each current collector includes a current collector and a corresponding conductive portion.

First and second protrusions 227 and 228 are formed in the anode current collector 220 in the direction of the electrolyte membrane 210 and the anode electrode 230, respectively. In addition, a first groove 217 and a second groove 238 are formed on one surface and the anode electrode 230 of the electrolyte membrane 210 facing the first protrusion 227 and the second protrusion 228, respectively. have. The first protrusion 227 is engaged with the first groove 217. The second protrusion 228 is formed to engage the second groove 238. The first protrusion 227 and the second protrusion 228 prevent movement of the electrolyte membrane 210 by contraction and expansion, thereby reducing the contact resistance between the electrolyte membrane 210 and the electrode 230.

The first protrusion 227 and the second protrusion 228 are formed to protrude on both sides of the current collecting line 221 of the current collector 220. The first protrusion 227 and the second protrusion 228 may be formed in a mesh shape, a line shape, or a point shape in the same shape as the current collecting line 221.

The first protrusion 227 and the second protrusion 228 may be formed to have a height approximately 20% of the thickness of the electrolyte membrane 210, depending on the thickness of the electrolyte membrane 210 and the electrode 230. When the thickness of the electrolyte membrane 210 is about 50 to 200 μm, the height of the first protrusion 227 and the second protrusion 228 may be about 10 to 50 μm.

In the cathode current collector 260, first and second protrusions 267 and 268 are formed in the electrolyte membrane 210 and the cathode electrode 270, respectively. The first protrusion 267 and the second protrusion 268 are formed to protrude on both sides of the current collecting line 261 of the current collector 260. The first protrusion 267 and the second protrusion 268 are formed. The first groove 217 and the second groove 268 are formed on one surface of the electrolyte membrane 210 and the cathode electrode 270 facing each other. The first protrusion 267 is engaged with the first groove 217. The second protrusion 268 is formed to be engaged with the second groove 238. The first protrusion 267 and the second protrusion 268 prevent movement of the electrolyte membrane 210 by contraction and expansion, thereby reducing contact resistance between the electrolyte membrane 210 and the electrode 270.

10 and 11 show a flexible printed circuit board (FPCB) in which a current collector made of a conductive metal is formed together on a polyimide film as the supports 214 and 116. In this case, the anode current collector and the cathode current collector may be integrally formed with the polyimide films 214 and 316, respectively, and then bonded to the electrolyte membrane 210.

The conductive portion 222 connected to the anode current collector A1 and the conductive portion 262 connected to the cathode current collector C8 are connected to terminals 224 and 364 for electrical connection to the outside, respectively. The terminals 224 and 364 may extend from the conductive portion 222 connected to the anode current collector A1 and the conductive portion 262 connected to the cathode current collector C8.

The stage 262a of the conductive portion 262 of the cathode current collector portion C1 of the first cell extends outside the support 216, and the conductive portion 222 of the anode current collector portion A2 of the second cell may extend. End 222a extends out of support 214. The support 216 on which the cathode current collector 260, the conductive part 262, and the terminal 264 are formed is disposed between the cathode electrode 270 and the electrolyte membrane 210, and the anode current collector 220. The support 214 on which the conductive portion 222 and the terminal 224 are formed is disposed between the anode electrode 230 and the electrolyte membrane 210, and then hot-pressed at 125 ° C. and 3 ton pressure for 3 minutes. Next, the ends 222a and 162a of the conductive parts 222 and 162 are electrically connected to each other by a spot welder or an ultrasonic welder. As described above, the anode current collectors A2 to A8 of each cell are electrically connected to the cathode current collectors C1 to C7 of the neighboring cells. Thus, the first to eighth cells are connected in series.

The current collectors 220 and 160, the conductive parts 222 and 162, and the terminals 224 and 164 may be made of metal having an electrical conductivity of 1 S / cm or more. Ag, Au, Al, Ni, Cu, Pt, Ti, Mn, Zn, Fe, Sn and their alloys may be used as the metal, respectively. As the metal substitute, a conductive polymer such as polyaniline, polypyrrole, polythiophene, or the like may be used.

In the monopolar membrane-electrode assembly 200 according to the second embodiment, the conductive parts 222 are directly connected to the conductive parts 222 and 362 connecting between the anode current collector 220 and the cathode current collector 260. , 262) is very short in length and therefore low in electrical resistance. In addition, since the current collectors 220 and 360 are installed between the electrolyte membrane 210 and the catalyst layer, there is no electrical resistance generated when electrons generated in the catalyst layer pass through the fuel diffusion part of the electrode and the electrode support. In addition, since the protrusions fix the electrolyte membrane, deformation of the electrolyte membrane can be prevented.

The monopolar membrane-electrode assembly according to the present invention has a short conductive length between the current collectors, and is installed in direct contact with the catalyst layer in which electrons are generated, thereby lowering resistance and increasing battery efficiency. In addition, since the current collector is not installed between the fuel and the electrode, the fuel is smoothly communicated. In the conventional mesh structure, the liquid fuel leaks through the mesh, but the current collector is a membrane in the liquid fuel cell of the present invention. Since there exists a thin film between and an electrode, fuel leak is hardly generated. In addition, the protrusion of the present invention prevents deformation of the electrolyte membrane.

Although the present invention has been described with reference to the embodiments with reference to the drawings, this is merely exemplary, it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined only by the appended claims.

Claims (8)

An electrolyte membrane in which a plurality of cell regions are formed; An anode support and a cathode support each having a plurality of first openings corresponding to the cell region and a plurality of second openings associated with the cell region on both sides of the electrolyte membrane; A plurality of anode current collectors and a plurality of cathode current collectors respectively provided in the cell region on the support; And a plurality of anode electrodes and a plurality of cathode electrodes respectively provided on the anode current collector and the cathode current collector. Each current collector includes a current collector configured to collect current by forming a plurality of current collector lines on the cell region; And And a conductive part connected to one side of the current collector, Corresponding terminals of the cathode current collector and the anode current collector are electrically connected in series through corresponding second openings, A first groove corresponding to the current collecting line is formed in each cell region on both sides of the electrolyte membrane, and the current collecting line has a monopolar membrane-electrode assembly, wherein a first protrusion is formed to engage the first groove. . An electrolyte membrane in which a plurality of cell regions are formed; An anode support and a cathode support formed with a plurality of first openings corresponding to the cell region on both surfaces of the electrolyte membrane; A plurality of anode current collectors and a plurality of cathode current collectors respectively provided in the cell region on the support; And a plurality of anode electrodes and a plurality of cathode electrodes respectively provided on the anode current collector and the cathode current collector. Each current collector includes a current collector configured to collect current by forming a plurality of current collector lines on the cell region; And And a conductive part connected to one side of the current collector, The stage of the conductive portion of the cathode current collector and the stage of the conductive portion of the anode current collector are respectively exposed to the outside of the support, so that the stage of the conductive portion of the cathode current collector and the conductive portion of the anode current collector Electrically connected in series, A first groove corresponding to the current collecting line is formed in each cell region on both sides of the electrolyte membrane, and the current collecting line has a monopolar membrane-electrode assembly, wherein a first protrusion is formed to engage the first groove. . The method according to claim 1 or 2, A second groove formed in the cathode electrode and the anode electrode to correspond to the current collector; The current collector is a monopolar membrane-electrode assembly, characterized in that the second projection is further formed to engage with the second groove. The method according to claim 1 or 2, The first projection is a monopolar film-electrode assembly, characterized in that formed in 20 ~ 50 ㎛ height. The method of claim 3, wherein The second projection is a monopolar film-electrode assembly, characterized in that formed in 20 ~ 50 ㎛ height. The method according to claim 1 or 2, Wherein said support is made of a material selected from the group consisting of polyimide, polyethylene, polypropylene, and polyvinyl chloride. The method of claim 6, The support and the current collector is a monopolar film-electrode assembly, characterized in that the flexible printed circuit board (FPCB) formed integrally. The method according to claim 1 or 2, The current collector is selected from the group consisting of Ag, Au, Al, Ni, Cu, Pt, Ti, Mn, Zn, Fe, Sn and alloys thereof.

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