KR20140035621A - Parallel fuel cell stack and fuel cell comprising the same - Google Patents

Abstract

The present invention relates to a parallel fuel cell stack and a fuel cell including the same. The parallel fuel cell stack and the fuel cell including the same according to one embodiment of the present invention reduce the probability of defects in the fuel cell and allows the control of a desired potential value with a current value. The parallel fuel cell stack of the present invention includes a stack membrane electrode assembly, a partition plate, and an end plate.

Description

PARALLEL FUEL CELL STACK AND FUEL CELL COMPRISING THE SAME}

The present application relates to a parallel fuel cell stack and a fuel cell including the same.

2. Description of the Related Art In recent years, due to rapid diffusion of portable electronic devices and wireless communication devices, much attention and research have been made on the development of a fuel cell as a portable power source battery, a fuel cell for a pollution-free vehicle, and a fuel cell for power generation as a clean energy source.

A fuel cell is an energy conversion device that converts chemical energy of a fuel directly into electrical energy. That is, a fuel cell uses a fuel gas and an oxidizing agent and generates electricity using electrons generated during the oxidation / reduction reaction. As a result, the fuel cell has a high energy efficiency and an environment- Research and development.

BACKGROUND OF THE INVENTION Polymer Electrolyte Membrane Fuel Cells (PEMFCs) have been spotlighted as portable, automotive, and home power supplies for their low operating temperatures, elimination of leaks due to the use of solid electrolytes, and fast operation. In addition, it is a high-output fuel cell having a higher current density than other types of fuel cells, and is operated at a temperature of less than 100 ° C, has a simple structure, has a fast start-up and response characteristics, and has excellent durability. Can be used as fuel. In addition, miniaturization can be achieved with a high output density, and research on a portable fuel cell continues.

The unit cell structure of the fuel cell has a structure in which an anode and a cathode are coated on both sides of an electrolyte membrane made of a polymer material, which is called a membrane electrode assembly (MEA). This membrane electrode assembly (MEA) is an electrochemical reaction between hydrogen and oxygen, and consists of an anode, a cathode, and an electrolyte membrane, that is, an ion conductive electrolyte membrane.

In the polymer electrolyte fuel cell, each unit cell composed of the membrane electrode assembly has a relatively low potential value, and thus, a stack in which the membrane electrode assembly is stacked in several layers to increase the potential value and obtain a desired power density value is obtained. Done. At this time, it was necessary to develop an efficient lamination method to obtain a desired dislocation value.

Korea Patent Publication No. 10-2009-0092592

The problem to be solved by the present application is to provide an efficient method of laminating a membrane electrode assembly in order to obtain a desired potential value.

One embodiment of the present application is a plurality of continuously arranged membrane electrode assembly; A separator provided between each membrane electrode assembly; And an end plate, the parallel fuel cell stack being connected in parallel with the supply position control of the anode fluid and the cathode fluid.

An exemplary embodiment of the present application provides a fuel cell including the parallel fuel cell stack.

Since the parallel fuel cell stack according to the exemplary embodiment of the present application includes both series connection and parallel connection, it is possible to reduce the possibility of defects in the fuel cell and to adjust the desired potential value to the current value.

1 is a view for explaining the principle of electricity generation of the fuel cell.
2 illustrates a parallel fuel cell stack according to an exemplary embodiment of the present application.
FIG. 3 is a diagram illustrating a circuit structure in which electrodes of a membrane-electrode assembly are connected according to an electrode fluid supplied to a separator in FIG. 2.
4 shows the same circuit structure as the structure of FIG.
5 is a view schematically showing the structure of a fuel cell according to an exemplary embodiment of the present application.

Advantages and features of the present application, and a method of achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present application is not limited to the embodiments disclosed below but may be embodied in various forms, and the present embodiments are only provided to complete the disclosure of the present application, and the general knowledge in the technical field to which the present application belongs. It is provided to fully convey the scope of the invention to those skilled in the art, and the present application is defined only by the scope of the claims. The dimensions and relative sizes of the components shown in the figures may be exaggerated for clarity of description.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this application belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

Hereinafter, the present application will be described in detail.

One embodiment of the present application is a plurality of continuously arranged membrane electrode assembly; A separator provided between each membrane electrode assembly; And an end plate (end plate), and provides a parallel fuel cell stack, characterized in that connected in parallel by adjusting the supply position of the anode fluid and the cathode fluid.

The membrane electrode assembly includes electrodes on both sides of the electrolyte. An anode, which is an electrode to which an anode fluid, which is a fuel, is supplied, is called an anode or a fuel electrode. Fuel is supplied from an anode to cause an oxidation reaction of hydrogen to generate hydrogen ions (H ⁺ ) and electrons. The cathode, which is the electrode to which the cathode fluid is supplied, is called a reduction electrode, an oxygen electrode, or an air electrode. In the cathode, water is generated by a reduction reaction of oxygen by combining hydrogen ions and oxygen passing through the polymer electrolyte membrane.

The polymer electrolyte membrane may be used as long as it is known in the art. The polymer for preparing an electrolyte membrane used in the present application may be used without limitation as long as the polymer for preparing an electrolyte membrane used in the art. For example, perfluorosulfonic acid polymer, hydrocarbon polymer, aromatic sulfone polymer, aromatic ketone polymer, polybenzimidazole polymer, polystyrene polymer, polyester polymer, polyimide polymer, polyvinylidene fluoride Polymer, polyether sulfone polymer, polyphenylene sulfide polymer, polyphenylene oxide polymer, polyphosphazene polymer, polyethylene naphthalate polymer, polyester polymer, doped polybenzimidazole polymer, poly It may be a single copolymer, an alternating copolymer, a random copolymer, a block copolymer, a multiblock copolymer or a graft copolymer made of any one or two or more polymers selected from the group consisting of ether ketone polymers and polysulfone polymers. However, the present invention is not limited thereto.

Recently, a sulfonated polymer has been attracting attention as a material of a non-fluorinated polymer electrolyte membrane. For example, sulfonated polyarylene ether polymer, sulfonated polyether ketone polymer, sulfonated polyamide polymer, sulfonated polyimide polymer, sulfonated polyphosphazene polymer, sulfonated polystyrene polymer and radiation polymerization Single copolymers, alternating copolymers, random copolymers, block copolymers, multiblock copolymers or graft copolymers made of any one or two or more polymers selected from the group consisting of sulfonated low density polyethylene-g-polystyrene-based polymers It may be, but is not limited thereto.

The membrane electrode assembly is a unitary unit in which an electrode and an electrolyte membrane are bonded. In this case, the cathode and / or the anode may be an electrode in which a catalyst layer is formed on one or both surfaces of a gas diffusion layer (GDL).

The electrode may be prepared according to conventional methods known in the art, for example, a catalyst including a metal catalyst, a hydrogen ion conductive polymer, a metal catalyst supported on a carbon-based support, a polymer ionomer, and a solvent to enhance catalyst dispersion. The catalyst layer can be formed by applying and drying the ink on the gas diffusion layer, and the electrode can be produced by the above method.

As the metal catalyst, any one or a mixture of two or more selected from the group consisting of platinum, ruthenium, osmium, platinum-ruthenium alloy, platinum-osmium alloy, platinum-palladium alloy, and platinum-transition metal alloy may be used. It is not limited to this.

The carbonaceous support may include graphite (graphite), carbon black, acetylene black, denka black, canyon black, activated carbon, mesoporous carbon, carbon nanotubes, carbon nanofibers, carbon nanohorns, and carbon nanorings. One or two or more mixtures selected from the group consisting of carbon nanowires, fullerenes (C60), and super P may be preferable examples.

As the polymer ionomer, sulfonated polymers such as nafion ionomer or sulfonated polytrifluorostyrene may be representatively used.

As the solvent, any one or a mixture of two or more selected from the group consisting of water, butanol, iso propanol, methanol, ethanol, n-propanol, n-butyl acetate and ethylene glycol may be preferably used.

In this case, the method of coating the catalyst ink on the gas diffusion layer may include, but is not limited to, printing, spraying, rolling, or brushing.

The gas diffusion layer is not particularly limited as long as the substrate is generally conductive and has a porosity of 80% or more, and may include a conductive substrate selected from the group consisting of carbon paper, carbon cloth, and carbon felt. The gas diffusion layer may further include a microporous layer formed on one surface of the conductive base material, and the microporous layer may include a carbon-based material and a fluororesin.

Examples of the carbon-based material include graphite (graphite), carbon black, acetylene black, denka black, canyon black, activated carbon, mesoporous carbon, carbon nanotubes, carbon nanofibers, carbon nanohorns, carbon nanorings, carbon nanowires, One or more mixtures selected from the group consisting of fullerenes (C60) and super P may be used, but is not limited thereto.

Examples of the fluororesin include polytetrafluoroethylene, polyvinylidene fluoride (PVdF), polyvinyl alcohol, cellulose acetate, copolymers of polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP) and styrene-butadiene rubber. Any one or a mixture of two or more selected from the group consisting of (SBR) may be used, but is not limited thereto.

Non-limiting examples of solvents used to enhance the catalyst dispersion in electrode preparation include water, butanol, isopropyl alcohol (IPA), methanol, ethanol, n-propanol, n-butyl acetate, ethylene glycol, and the like. These solvents may be used alone or in combination of two or more thereof.

The membrane electrode assembly is a type in which the catalyst layer of the anode and the catalyst layer of the cathode are in contact with the electrolyte membrane, and may be prepared according to conventional methods known in the art. In one example, the cathode; Anode; And it may be prepared by thermocompression bonding to the electrolyte membrane located between the cathode and the anode at 100 ℃ to 400 ℃

The separator may be a bipolar plate or a monopolar plate. The separator prevents direct contact between the membrane electrode assemblies and serves to transfer fuel and oxidant supplied from the outside to the membrane electrode assembly. A channel channel may be formed inside the separator plate.

As used herein, a bipolar plate means a separator provided between a cathode of one membrane electrode assembly and an anode of another membrane electrode assembly adjacent thereto, and a monopolar plate is a cathode of another membrane electrode assembly adjacent to the cathode of one membrane electrode assembly. The separator provided in between means a separator provided between the anode of one membrane electrode assembly and the anode of another adjacent membrane electrode assembly.

The parallel fuel cell stack according to the exemplary embodiment of the present application has a structure in which a plurality of membrane electrode assemblies are continuously arranged, and a series connection and a parallel connection are mixed, so that even if a defect occurs in any one of the membrane electrode assemblies, Performance will not be lowered. A stack fuel cell composed of only a series connection has a problem in that when a defect occurs in any one membrane electrode assembly, a defect occurs in the entire fuel cell, thereby degrading performance.

In addition, the parallel fuel cell stack according to the exemplary embodiment of the present application has an advantage of not generating unnecessary potential difference values because the series connection and the parallel connection are mixed. The stack fuel cell formed only in series has a problem in that the potential difference value continues to increase as the number of membrane electrode assemblies increases, so that the potential difference value is unnecessarily higher than a certain level.

In the parallel fuel cell stack according to the exemplary embodiment of the present application, at least one membrane electrode assembly set including a plurality of consecutively arranged membrane electrode assemblies may exist to obtain a desired potential value. When there are two or more membrane electrode assembly sets, each membrane electrode assembly set may be connected in parallel, and each membrane electrode assembly set may be connected in series.

The series connection and the parallel connection are possible by adjusting the supply position of the anode fluid and the cathode fluid.

When two or more membrane electrode assembly sets composed of a plurality of consecutively arranged membrane electrode assemblies exist to obtain the potential value, the separator plate between each membrane electrode assembly set may be a monopolar plate. In addition, the separator in each membrane electrode assembly set consisting of a plurality of consecutively arranged membrane electrode assemblies to obtain the potential value may be a bipolar plate.

In this case, the monopolar plate may supply the electrode fluid of any one of the anode fluid and the cathode fluid to the membrane electrode assembly in both directions, and the bipolar plate may supply the anode fluid and the cathode fluid to the membrane electrode assembly in both directions.

The monopolar plate may have one or two inlet lines through which electrode fluid is injected, and preferably two. When there are two inlet lines, the electrode fluid of either the cathode fluid or the anode fluid may be injected into the two inlet lines to supply fluid to the adjacent electrodes. When the cathode fluid is supplied, the fluid may be supplied to the adjacent cathodes in both directions, and when the anode fluid is supplied, the fluid may be supplied to the anodes in both the adjacent directions.

When there is one inlet line of the monopolar plate, when the electrode fluid is supplied to the membrane electrode assembly in both directions, it is difficult to control the amount of fluid supplied to the membrane electrode assembly, and thus performance may be deteriorated when the flow rates in both directions are differently supplied.

In the case of two inlet lines of the monopolar plate, one of the anode fluid and the cathode fluid may be supplied in the same amount to the membrane electrode assembly in both directions. At this time, since the amount of the electrode fluid supplied to the adjacent membrane electrode assembly in both directions is maintained the same, there is an advantage that the performance of the fuel cell can be kept constant.

The bipolar plate may have two inlet lines through which electrode fluid is injected. The cathode fluid may be injected into one of them to supply fluid to the cathode, and the anode fluid may be injected into one of the other to supply fluid to the anode to supply the cathode fluid and the anode fluid to the membrane electrode assembly in both directions, respectively.

When there are several sets of membrane electrode assemblies composed of a plurality of membrane electrode assemblies in order to obtain the desired potential value, the number of membrane electrode assemblies in the set may or may not be constant.

When the number of membrane electrode assemblies in the set is constant, for example, 12 membrane electrode assemblies are stacked fuel cells arranged in series, and three sets of four membrane electrode assemblies exist to obtain a desired potential value. Assume that there is a bipolar plate separator plate between each membrane electrode assembly set within each membrane electrode assembly set, and there may be a monopolar plate separator plate between each membrane electrode assembly set. That is, end plates for supplying anode or cathode fluid to adjacent membrane electrode assemblies are present at both ends of the entire membrane electrode, and the first to third separators, the fifth to seventh separators, and the ninth to eleventh separators are provided. The bipolar plate, the fourth separator plate, the eighth separator plate may be a monopolar plate.

In this case, since the anode fluid and the cathode fluid are respectively supplied to adjacent membrane electrode assemblies in both directions, the bipolar plate is supplied with the anode fluid and the cathode fluid together to the electrodes of the adjacent first membrane electrode assembly. By supplying the anode fluid and supplying the cathode fluid to the electrodes of the adjacent second membrane electrode assembly, the first membrane electrode assembly and the second membrane electrode assembly may be configured in series. Similarly, the anode and cathode fluids are also supplied to the second separator plate to supply the anode fluid to the electrodes of the adjacent second membrane electrode assembly and the cathode fluid to the electrodes of the adjacent third membrane electrode assembly. The first membrane electrode assembly can be configured in series.

In addition, since the monopolar plate is supplied with the electrode fluid of either the anode fluid or the cathode fluid, for example, the fourth separator is supplied with the anode fluid so as to supply the anode fluid to the electrodes of the adjacent fourth membrane electrode assembly and the adjacent 5 fluid. An anode fluid may also be supplied to the electrodes of the first membrane electrode assembly to configure the fourth membrane electrode assembly and the fifth membrane electrode assembly in parallel connection.

In this case, the first membrane electrode assembly to the fourth membrane electrode assembly are connected in series, and the fourth membrane electrode assembly and the fifth membrane electrode assembly are connected in parallel, and the fifth membrane electrode assembly to the eighth membrane electrode assembly are connected in series. The parallel between the eighth membrane electrode assembly and the ninth membrane electrode assembly is connected in series, and the ninth membrane electrode assembly to the twelfth membrane electrode assembly are connected in series. Here, the number of fuel cell unit cells connected in series is four.

In the parallel fuel cell stack according to an exemplary embodiment of the present application, the number of membrane electrode assemblies may be mn (m is an integer of 2 or more, n is an integer of 1 or more), and the number of separators may be mn-1. . Mn means m × n.

In the parallel fuel cell stack according to the exemplary embodiment of the present application, an (a is an integer of 1 ≦ a ≦ m−1) th separator may be a monopolar plate, and the other separator may be a bipolar plate. In this case, n may be the number of fuel cell unit cells arranged in series. An means a × n.

Specifically, the inside of the membrane electrode assembly set consisting of n membrane electrode assemblies may be configured in series connection. From the first separator to the n-1th separator are bipolar plates, the anode fluid and the cathode fluid are supplied to supply the anode fluid to the electrodes of the adjacent membrane electrode assembly and the cathode fluid to the electrodes of the other membrane electrode assemblies adjacent thereto. Two membrane electrode assemblies can be connected in series.

The nth separator is a monoplate, and only one electrode fluid of the anode fluid and the cathode fluid is supplied to supply the same electrode fluid to the electrodes of the nth membrane electrode assembly and the electrodes of the n + 1th membrane electrode assembly. The first membrane electrode assembly and the n + 1th membrane electrode assembly can be connected in parallel.

Also, the n + 1 th separation plate to the 2n-1 th separation plate are bipolar plates, and the anode fluid and the cathode fluid are supplied to supply the anode fluid to the electrodes of the adjacent membrane electrode assemblies, and the cathode fluid to the electrodes of the other membrane electrode assemblies. It is possible to supply two adjacent membrane electrode assemblies in series by supplying.

The next 2n separation plate is also a mono plate, in which only the electrode fluid of either the anode fluid or the cathode fluid is supplied to supply the same electrode fluid to the electrodes of the 2nth membrane electrode assembly and the electrodes of the 2n + 1th membrane electrode assembly. The first membrane electrode assembly and the 2n + 1th membrane electrode assembly can be connected in parallel.

2 illustrates a parallel fuel cell stack according to an exemplary embodiment of the present application.

FIG. 2 is a structure in which eight membrane-electrode assemblies (MEA), six bipolar plates, six monopolar plates, and two end plates exist at both ends. . The anode and cathode fluids are supplied together to the first bipolar plate to supply the anode fluid to the first membrane-electrode assembly and the cathode fluid to the second membrane-electrode assembly, thereby supplying the first membrane-electrode assembly and the second membrane-electrode. Connect the junctions in series. Anodic fluid and cathode fluid are also supplied to the second bipolar plate to supply the anode fluid to the second membrane-electrode assembly and the cathode fluid to the third membrane-electrode assembly, thereby supplying the second membrane-electrode assembly and the third membrane-electrode. Connect the junctions in series. Both the third bipolar plates and the sixth bipolar plates connect adjacent membrane-electrode assemblies in series in the same manner. One monopolar plate is supplied with only anode fluid through two inlet lines to supply the same amount of anode fluid to both the fourth and fifth membrane-electrode assemblies, thereby providing the fourth membrane-electrode assembly and the fifth membrane-. The electrode assemblies are connected in parallel. In addition, the end plate adjacent to the first membrane-electrode assembly supplies cathode fluid to the first membrane electrode assembly, and the end plate adjacent to the eighth membrane electrode assembly supplies cathode fluid to the eighth membrane electrode assembly.

FIG. 3 is a schematic diagram illustrating a circuit structure in which electrodes of a membrane-electrode assembly are connected according to an electrode fluid supplied to a separator in FIG. 2.

4 is a circuit structure identical to the structure of FIG.

On the other hand, when there are a plurality of membrane electrode assembly sets composed of a plurality of membrane electrode assemblies in order to obtain the desired potential value, the number of membrane electrode assemblies in the set may not be constant.

If the number of membrane electrode assemblies in the set is not constant, for example, a set of 12 membrane electrode assemblies are stacked fuel cells arranged in series, and a set consisting of three membrane-electrode assemblies to obtain a desired potential value, It may consist of a set consisting of four membrane electrode assemblies and a set consisting of five membrane electrode assemblies. At this time, the supply position of the anode fluid and the cathode fluid can be configured in series connection between the membrane electrode assembly in each set, and each set of membrane electrode assembly can be configured in parallel connection.

In the parallel fuel cell stack according to the exemplary embodiment of the present application, the end plate may be provided adjacent to the membrane electrode assembly positioned at both ends of the plurality of membrane electrode assemblies. For example, in the case of a fuel cell in which n membrane electrode assemblies are connected, the fuel cell is provided adjacent to the first membrane electrode assembly and the nth membrane electrode assembly, and the electrode fluid of any one of the anode fluid and the cathode fluid is adjacent to each other. Supplied to the membrane-electrode assembly. The end plate has one inlet line, and may supply an electrode fluid of any one of an anode fluid and a cathode fluid to an adjacent membrane electrode assembly.

In the parallel fuel cell stack according to the exemplary embodiment of the present application, the anode fluid may be selected from the group consisting of methanol, ethanol, butanol, propanol, formic acid, an aqueous hydrogen compound solution, and hydrogen gas. More specifically, it may be a hydrogen gas.

In the parallel fuel cell stack according to the exemplary embodiment of the present application, the cathode fluid may be air or oxygen gas, and more specifically, air.

An exemplary embodiment of the present application provides a fuel cell including the parallel fuel cell stack. The fuel cell stack serves to generate electricity through an electrochemical reaction between a fuel and an oxidant.

In one embodiment of the present application, the fuel cell includes a fuel supply unit supplying fuel to the stack; And an oxidant supply unit supplying an oxidant to the stack.

5 schematically shows a structure of a fuel cell according to an exemplary embodiment of the present application.

Referring to FIG. 5, the fuel cell of the present application includes a fuel cell stack 200, a fuel supply unit 400, and an oxidant supply unit 300. The fuel cell of the present application includes at least one membrane electrode assembly and at least one separator plate including an anode and a cathode positioned opposite to each other, and between the anode and the cathode, the composite electrolyte membrane for a fuel cell according to the present application, One or more fuel cell stacks 200 that generate electricity through electrochemical reactions of fuel and oxidant; A fuel supply unit 400 for supplying fuel to the electricity generating unit; And an oxidant supply unit 300 for supplying the oxidant to the electricity generating unit.

The fuel supply unit 400 serves to supply fuel to the electricity generating unit, and includes a fuel tank 410 for storing fuel and a pump 420 for supplying fuel stored in the fuel tank 410 to the electricity generating unit. Can be.

The oxidant supply unit 300 serves to supply an oxidant to the electricity generator. The oxidant may be oxygen or air and may be used by injecting oxygen or air into the pump 420.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Having described specific portions of the present application in detail, those skilled in the art will appreciate that these specific embodiments are merely preferred embodiments and that the scope of the present application is not limited thereto. Accordingly, the actual scope of the present application will be defined by the appended claims and their equivalents.

200: fuel cell stack
300: oxidant supply unit
400: fuel supply unit
410: fuel tank for storing fuel
420: pump

Claims (16)

A plurality of continuously arranged membrane electrode assemblies;
A separator provided between each membrane electrode assembly; And
End plate,
A parallel fuel cell stack, characterized in that connected in parallel by adjusting the supply position of the anode fluid and the cathode fluid. The method according to claim 1,
There is at least one set of membrane electrode assemblies consisting of a plurality of consecutively arranged membrane electrode assemblies to obtain a desired potential value,
Between each set of membrane electrode assemblies is a parallel connection,
A parallel fuel cell stack, wherein each of the membrane electrode assembly sets is connected in series. The method according to claim 2,
The separator between the membrane electrode assembly set is a monopolar plate,
The separator in the membrane electrode assembly set is a parallel type fuel cell stack, characterized in that the bipolar plate. The method according to claim 3,
The monopolar plate supplies an electrode fluid of any one of an anode fluid and a cathode fluid to the membrane electrode assembly in both directions,
The bipolar plate is a parallel fuel cell stack, characterized in that for supplying the anode fluid and the cathode fluid to the membrane electrode assembly in both directions. The method according to claim 3,
The monopolar plate has two inlet lines,
A parallel fuel cell stack comprising supplying an electrode fluid of any one of an anode fluid and a cathode fluid in equal amounts to both membrane electrode assemblies. The method according to claim 1,
The number of the membrane electrode assembly is mn (m is an integer of 2 or more, n is an integer of 1 or more),
Parallel fuel cell stack, characterized in that the number of the separator is mn-1. The method of claim 6,
an (a is an integer of 1≤a≤m-1) th separator is a monopolar plate,
The remaining separator is a parallel fuel cell stack, characterized in that the bipolar plate. The method of claim 7,
The monopolar plate supplies an electrode fluid of any one of an anode fluid and a cathode fluid to the membrane electrode assembly in both directions,
The bipolar plate is a parallel fuel cell stack, characterized in that for supplying the anode fluid and the cathode fluid to the membrane electrode assembly in both directions. The method of claim 7,
The monopolar plate has two inlet lines,
A parallel fuel cell stack comprising supplying an electrode fluid of any one of an anode fluid and a cathode fluid in equal amounts to both membrane electrode assemblies. The method of claim 7,
N is the number of fuel cell unit cells arranged in series parallel fuel cell stack. The method according to claim 1,
The end plate is parallel to the fuel cell stack, characterized in that provided adjacent to the membrane electrode assembly located at both ends of the plurality of membrane electrode assembly. The method according to claim 1,
The end plate has one inlet line,
A parallel fuel cell stack comprising supplying an electrode fluid of one of an anode fluid and a cathode fluid to an adjacent membrane electrode assembly. The method according to claim 1,
The anode fluid is a parallel fuel cell stack, characterized in that selected from the group consisting of methanol, ethanol, butanol, propanol, formic acid, hydrogen compound solution and hydrogen gas. The method according to claim 1,
And said cathode fluid is air or oxygen gas. A fuel cell comprising the parallel fuel cell stack of claim 1. 16. The method of claim 15,
The fuel cell may include a fuel supply unit supplying fuel to the stack; And
And a oxidant supply unit for supplying an oxidant to the stack.

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