KR20020074046A - Monopolar cell pack of direct methanol fuel cell - Google Patents

Abstract

PURPOSE: A monopolar cell pack for the direct methanol fuel cell is provided, to prevent the loss of fuel, to simplify the internal electric circuit, to reduce the loss due to the resistance and to allow the carbon dioxide, by-product to be discharged smoothly. CONSTITUTION: The monopolar cell pack comprises an upper plate(301) and a lower plate(302) separated by a certain space; an ion exchange membrane(101) which is positioned between the two plates and has a primary face and a secondary face corresponding the primary face, wherein the two faces contain a plurality of unit cell ranges; a plurality of primary anodes(121) set in the unit cell range of the primary face and a plurality of primary cathodes(131) arranged in the unit cell range adjacent to the each primary anode; a plurality of secondary cathodes corresponding to the each primary anodes and a plurality of secondary anodes corresponding to the each primary cathodes, wherein the cathodes and the anodes are set in the unit cell range of the secondary face; a primary anode current collection plate and a second anode current collection plate which are set in the upper plate of the primary and secondary anodes and contains a fuel passing range(151a); a primary cathode current collection plate and a second cathode current collection plate which are set in the upper plate of the primary and secondary cathodes and contains an air passing range; a plurality of primary conductive parts which connect the primary anode and the primary cathode adjacent each other in the primary face electrically; and a plurality of secondary conductive parts which connect the secondary anode and the secondary cathode adjacent each other in the secondary face electrically and connects the cells positioned in the unit cell ranges in serial.

Description

Monopolar cell pack of direct methanol fuel cell

The present invention relates to a cell pack of a direct methanol fuel cell, and more particularly, to a cell pack of a direct methanol fuel cell capable of simplifying a connection circuit between cells and enabling effective discharge of by-products.

Direct Methanol Fuel Cell (DMFC, hereinafter referred to as DMFC) is a future clean energy source that can replace fossil energy and has high power density and energy conversion efficiency. In addition, since it can operate at room temperature, and can be miniaturized and sealed, it can be used in pollution-free automobiles, household power generation systems, mobile communication equipment, medical equipment, military equipment, space business equipment, and the like, and its application fields are very diverse.

Direct Methanol Fuel Cells (DMFCs are referred to as DMFCs) generate electricity from the electrochemical reaction of methanol and oxygen. As shown in FIG. 1, the unit cell of the DMFC, that is, a cell, has a structure in which a hydrogen ion exchange membrane 1 is interposed between the anode 2 and the cathode 3. The hydrogen ion exchange membrane 1 has a thickness of 50 to 200 µm and is made of a solid polymer electrolyte. Both the anode 2 and the cathode 3 of the cell consist of a support layer for the supply and diffusion of fuel and a catalyst layer in which the oxidation / reduction reaction of the fuel takes place.

The support layer of the anode 2 and the cathode 3 is coated with carbon paper or carbon cloth and is wet-proofed to facilitate the supply of methanol as a liquid fuel and the discharge of water as a reaction product.

In the anode 2, hydrogen ions, electrons, and carbon dioxide are generated (oxidation reaction) by reaction of supplied methanol, ethanol or isopropyl alcohol and water, and the generated hydrogen ions are transferred to the cathode through a hydrogen ion exchange membrane. In the cathode 3, hydrogen ions and oxygen react to generate water (reduction reaction).

Schemes 1 and 2 below show the reaction at the anode and cathode as described above, and Scheme 3 shows the reaction scheme of the entire unit cell.

Since the generation voltage of the unit cell is about 1.2V in theory, in order to generate a desired high voltage, several unit cells are stacked and electrically connected in series to obtain a desired voltage. At this time, a flow field and a bipolar plate, which is a collector plate, are applied as many as the number of stacked cells to supply fuel and air to each unit cell and to collect electricity generated. In this case, the channel may use a metallic mesh, but mainly uses a structure in which a flow path is processed and engraved into a graphite block, which is a current collector plate having a predetermined thickness or more, which is electrically conductive and capable of sealing gas.

However, this method requires a complex flow path design to supply fuel and oxygen continuously and unmixed from the outermost unit cell of the stacked stack to the unit cell inside the stack. There is a risk of liquid or gas leakage. In addition, it is difficult to encapsulate it because it is necessary to stack several current collector plates, and it is difficult to reduce the size and weight of the stack, which in turn affects the power density. In addition, since the outermost part of the stack and the internal resistance of the middle portion, the temperature and the degree of humidification are not uniform, the unit batteries may be partially loaded, which may shorten the life of the stack. In the case of high output stacks, the conventional stacking stack may be advantageous even if these disadvantages are taken into account, but in the case of low power applications such as electronic devices, a monopolar cell pack structure that compensates for these disadvantages is advantageous.

In the conventional monopolar cell pack structure, anodes 2a are disposed on one side of the ion exchange membrane 1a as exemplarily shown in FIG. 2A and a cross-sectional view of FIG. 2B, and the anodes 2a are disposed on opposite sides thereof. Cathodes 3a are arranged in correspondence with " Therefore, in order to electrically connect each cell in series, the connecting lead 4 of the anode 2a and the cathode 3a of the adjacent cell must pass through the ion exchange membrane 1a between the anode 2a and the cathode 3a. . Therefore, in this case, a passage or a hole for passing the connecting wire should be formed in the ion exchange membrane 1a. However, these passages or holes must be sealed because of the potential for fuel leakage. When not passing through the ion exchange membrane 1a, the connecting lead must be bypassed to the outside of the cell pack. In this case, when the lead wire is bypassed to the outside of the cell pack, the length of the lead wire becomes longer, and thus a current loss occurs due to an increase in the lead resistance of the lead wire, which also causes fuel leakage. It must be sealed. In addition, such a conventional cell pack has a poor contact state between the current collector plate, the anode and the cathode, and the current loss due to the contact resistance is generated because the contact surface is not wide. The drawback of the conventional cell pack is that there is no discharge passage for discharging the by-product CO ₂ gas, which hinders the fuel supply by the CO ₂ gas and thus the reactivity of the electrode.

FIG. 3 schematically illustrates a cell pack 10 disclosed in US Pat. No. 5,925,477 as an example of a conventional single electrode cell pack.

Referring to FIG. 3, in a state in which one unit cell is disposed and the opposing portions of adjacent cells overlap each other, each of the cathodes 13 and 13a of each cell is connected to the anode 12a of the adjacent cell. (14, 14a) are electrically connected in series. Such a structure must form a fuel flow field for supplying fuel to a graphite plate provided with a flow path, and a fuel path outside the cell must be separately designed for fuel flow between electrodes, and Since the electrodes themselves, such as anodes and cathodes, in which chemical reactions occur, must be bent, there is a problem in the manufacturing process as well as the lifetime of the electrodes.

It is a first object of the present invention to provide a single electrode cell pack for a direct methanol fuel cell, in which the electrical connection structure between the cells is simplified.

A second object of the present invention is to provide a single-electrode cell pack for a direct methanol fuel cell in which fuel leakage in a cell is effectively suppressed.

It is a third object of the present invention to provide a single-electrode cell pack for a direct methanol fuel cell that can effectively discharge gas generated inside a cell.

1 is a view showing the basic structure of a direct methanol fuel cell.

2A is a plan view illustrating an electrical connection structure between unit cells in a conventional single electrode fuel cell.

FIG. 2B is a cross-sectional view taken along the line D-D of FIG. 2A.

Figure 3 schematically shows an example of a conventional single-electrode cell pack.

4 is a conceptual plan view showing an electrical connection structure between cells in a single electrode cell pack for a direct methanol fuel cell according to the present invention.

5 is a conceptual bottom view showing an electrical connection structure between cells in a single electrode cell pack for a direct methanol fuel cell according to the present invention.

6 is a cross-sectional view taken along the line AA of FIG.

Figure 7 is a three-dimensional layout of the major components showing a more specific structure of a single electrode cell pack for direct methanol fuel cell according to the present invention.

8 is a schematic perspective view of a single electrode cell pack for a direct methanol fuel cell according to the present invention.

9 is an exploded perspective view of a single electrode cell pack for a direct methanol fuel cell according to the present invention shown in FIG. 8.

10 is a perspective view of a lower plate applied to a single electrode cell pack for a direct methanol fuel cell according to the present invention.

11 is a plan view showing an inner surface of a top plate applied to a single electrode cell pack for a direct methanol fuel cell according to the present invention.

12 is a plan view showing an inner surface of a lower plate applied to a single electrode cell pack for a direct methanol fuel cell according to the present invention.

FIG. 13 is a cross-sectional view taken along line B-B of FIG. 11 and line C-C of FIG.

FIG. 14 is an enlarged cross-sectional view of a portion “D” in FIG. 13.

15 is a cross-sectional view taken along the line E-E of FIG.

16 and 17 are perspective views illustrating respective inner surfaces of the upper plate and the lower plate on which the first current collecting member and the second current collecting member are installed.

18 is a graph showing the performance of a single electrode cell pack for a direct methanol fuel cell according to the present invention.

* Explanation of the reference numerals for the main parts of the drawings

301: top plate

301a: fuel supply area 303: air supply area

301b: second gas discharge channel

302: bottom plate

302a: fuel supply area 305: air supply area

302b: second gas discharge channel

201: upper gasket 202: lower gasket

101: ion exchange membrane

121: first anode 122: second anode

131: first cathode 132: second cathode

150: first current collecting member

151: first anode current collector 152: first cathode current collector

141a: first conductive portion 151a: fuel passage region

152a: air passage area 151b: first gas discharge channel

160: second current collector member

161: second anode current collector 162: second cathode current collector

142a: second conductive portion 161a: fuel passage area

162a: Air passage area 163a, 164a: Terminal part

161b: first gas discharge channel

In order to achieve the above object, according to the present invention,

An upper plate and a lower plate maintaining a predetermined interval;

An ion exchange membrane provided between the upper plate and the lower plate, the second plate having a first surface and a second surface corresponding to the first surface, and having a plurality of unit cell regions on the first and second surfaces;

A plurality of first anodes provided for each unit cell region of the first surface of the ion exchange membrane and a plurality of first cathodes disposed in the unit cell region adjacent to each first anode;

A plurality of second cathodes corresponding to each of the first anodes and a plurality of second anodes corresponding to each of the first cathodes, each unit cell region of the second surface of the ion exchange membrane;

A first anode current collector plate and a second anode current collector plate disposed on upper surfaces of the first anode and the second anode, respectively, and having a fuel passage region formed thereon;

A first cathode current collector plate and a second cathode current collector plate disposed on upper surfaces of the first cathode and the second cathode, respectively, and having air passage regions formed therein;

A plurality of first conductive parts electrically connecting the first anode and the first cathode adjacent to each other on the first surface of the ion exchange membrane;

A plurality of second conductive parts electrically connecting the second anode and the second cathode adjacent to each other on the second surface of the ion exchange membrane to electrically connect the cells provided in the unit cell regions; A single electrode cell pack is provided.

According to a preferred embodiment of the single-electrode cell pack for direct methanol fuel cell according to the present invention, the fuel supply region for the fuel supply to the first and second anodes on the upper plate and the lower plate and the first and second cathodes An air supply area for air supply is provided.

The first and second anodes and the first and second cathodes, respectively, and the first and second anode current collector plates respectively corresponding to the fuel supply regions provided in the upper and lower plates, respectively, The two-cathode current collector plate has a size corresponding to the air supply region provided in the upper plate and the lower plate.

The first conductive portion is integrally formed with each first anode disposed on the first surface of the ion exchange membrane and the first cathode electrically connected thereto, and the second conductive portion is formed on the second surface of the ion exchange membrane. It is formed integrally with the second anode and the second cathode electrically connected thereto.

A current collector insertion groove into which a first current collector plate is inserted is formed on an inner surface of the upper plate, and a current collector insertion groove into which a second anode current collector, a second cathode current collector, and a second conductive part connecting the same are introduced into an inner surface of the lower plate. And a conductive portion insertion groove is formed.

A plurality of first gas discharge channels are formed on each inner surface of the first anode current collector plate and the second anode current collector plate for discharging the by-products generated at the first anode and the second anode, and the upper and lower plates are formed on the inner surfaces of the upper plate and the lower plate. A plurality of second gas discharge channels connected to each first gas discharge channel are formed.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a single electrode cell pack for direct methanol fuel cell according to the present invention will be described in detail.

4 and 5 are a schematic plan view and a bottom view showing the electrical connection structure between the cells in the single-electrode cell pack for direct methanol fuel cell according to the present invention, Figure 6 is a cross-sectional view taken along line A-A of FIG.

Referring to FIG. 4, a plurality of first anodes 121 are arranged in one row on a first surface, which is an upper surface of the ion exchange membrane 101, and a plurality of first cathodes 131 are arranged in parallel with an array of the first anodes 121. Are arranged in one column. That is, each of the first anode 121 and each first cathode 131 is disposed in the unit cell region.

Referring to FIG. 5, the second anodes 122 are arranged in one row on the second surface, which is the bottom surface of the ion exchange membrane 101, and the plurality of second cathodes 132 are arranged side by side in the arrangement of the second anodes 122. It is arranged in one column.

As shown in FIG. 6, a first anode 121 disposed on the first surface and a second cathode 132 formed on the second surface are correspondingly disposed, and the first cathode 131 disposed on the first surface. ) Is disposed corresponding to the second anode 122 disposed on the second surface.

The first anode 121, the corresponding second cathode 132, the first cathode 131, and the corresponding second anode 122 may be formed between the portions of the ion exchange membrane 101 located between them. Together, unit cells are formed.

As shown in FIGS. 4 and 6, each of the first anode 121 and each of the first cathodes 131 adjacent thereto on the first surface of the ion exchange membrane 101 is electrically connected by the first conductive portion 141. Is connected. As shown in FIG. 5, each of the second anodes 122 on the second surface of the ion exchange membrane 101 is electrically connected by the second cathode 132 and the second conductive portion 142 adjacent to each other in the diagonal direction. Is connected.

According to such an electrical connection structure, the cells of the unit cell region are electrically connected in series. That is, the anode and the cathode are thus connected in series by a zigzag connection structure by the first and second conductive parts positioned on the first and second surfaces of the ion exchange membrane 101. At this time, the first conductive portion 141 and the second conductive portion 142 are positioned on the first and second surfaces, respectively, without passing through the ion exchange membrane 101 as in the prior art. This structure is made possible by distributing the first anode and the first cathode and the second anode and the second cathode on the first and second surfaces.

4 to 6, current collectors in contact with each anode and cathode are omitted. In reality, a current collector plate described below is installed on each of the first and second anodes and the first and second cathodes, and the first and second conductive parts 141 and 142 are connected to the current collector plate, respectively. The structure is described in detail later.

Figure 7 is a three-dimensional layout of the major components showing a more specific structure of a single electrode cell pack for direct methanol fuel cell according to the present invention.

Referring to FIG. 7, a current collector member in which an anode current collector and a cathode current collector are integrated is disposed on the upper and lower surfaces of the ion exchange membrane 101 in which the anode and the cathode are disposed in the above-described structure. do.

In FIG. 7, the first current collector member 150 positioned above the ion exchange membrane 101 corresponds to the first anode current collector plate 151 and the first cathode 131 corresponding to the first anode 121. The first cathode first collector plate 152 and the first conductive portion 141a therebetween have a rectangular shape integrally formed. In the first anode current collector plate 151 and the first cathode current collector plate 152, a plurality of fuel passage regions 151 a and air passage regions 152 a in the form of through holes are formed to be densely packed.

On the other hand, the second current collector member 160 positioned below the second surface of the ion exchange membrane 101 is connected to the second anode collector plate 161 and the second cathode 132 corresponding to the second anode 122. The corresponding second cathode current collector plate 162 and the second conductive portion 142a therebetween are integrally formed. As described above, the second conductive part 142a electrically connects the second anode current collector 161 and the second cathode current collector 162 in a diagonal direction.

Meanwhile, an independent second cathode current collector plate 163 and a second anode current collector plate 164 are disposed at the second cathode 132 and the second anode 122 positioned at both ends of the serial connection structure as described above. Contact. Terminal portions 163a and 164a for electrical connection to the outside are formed at ends of the independent second cathode current collector plate 163 and the second anode current collector plate 164. The second anode current collector plates 161 and 164 have a plurality of through-hole fuel passage regions 161a, and the second cathode current collector plates 162 and 163 have a plurality of through-hole air passage regions 162a formed therein. .

The current collecting member serves not only to collect current but also to supply fuel or oxygen. A fuel passage hole is formed in the anode collector plate, and an air passage hole is formed in the cathode collector plate. The size of the fuel passage hole is large enough to pass through the surface tension when the liquid such as methanol passes through to prevent the fuel from collecting on the current collector. At this time, the diameter of the fuel passage hole is preferably at least 1.5 mm. In the case of the air passage hole, the number of electrodes per cathode is increased so that the electrode and the air are sufficiently in contact with the cathode so that a smooth electrode reaction can occur.

FIG. 8 is a schematic perspective view of a completed single electrode cell pack for a direct methanol fuel cell according to the present invention, and FIG. 9 is an exploded perspective view thereof.

The upper gasket 201, the ion exchange membrane 101, and the lower gasket 202 are sequentially stacked between the upper plate 301 and the lower plate 302, and the laminated structure is formed by a bolt 105a and a nut 105b. This one is combined.

As shown in FIG. 9, the upper and lower gaskets 201 and 202 may be formed on the upper and lower surfaces of the ion exchange membrane 101, that is, on the first anode 121 and the first cathode 131 and the second surface. A plurality of through holes 201a and 202a corresponding to the second anode 122 and the second cathode 132 are formed.

8 and 9, the upper plate 301 has a plurality of rectangular through hole-shaped fuel supply regions 301a corresponding to the fuel passage region 151a of the first anode current collector plate 151. A plurality of air supply regions 303 are formed in a row and have a plurality of air supply holes 303a corresponding to the air passage regions 152a of the first cathode current collector plate 152. .

As shown in FIG. 10, the fuel supply region 302a and the air supply region 305 having the above structure are formed on the bottom surface of the lower plate 302. The fuel supply region 302a in the lower plate 302 is formed in a rectangular through hole shape corresponding to the fuel passage region 161a of the second anode current collector 161 provided on the second surface of the ion exchange membrane 101. Each air supply region 305 having a plurality of air supply holes 305a is formed to correspond to the air passage region 162a of the second cathode current collector 162.

FIG. 11 is a plan view showing the inner surface of the upper plate 301, and FIG. 12 is a plan view showing the inner surface of the lower plate 302. FIG. 13 is a cross-sectional view taken along the line B-B of FIG. 11 and a line C-C in FIG. 12, and FIG. 14 is an enlarged cross-sectional view of the portion “D” in FIG. 13.

11 and 12, a plurality of first current collector members 150 and second current collector members 160 are coupled to each inner surface of the upper plate 301 and the lower plate 302 in parallel.

As shown in FIGS. 11 and 12, the first current collector 150 and the second current collector 160 of the second current collector 160 are longitudinally disposed on the surfaces of the second anode current collector 151 and the second anode current collector 161. The first gas discharge channels 151b and 161b extending to the top surface are formed. In addition, second gas discharge channels 301b and 302b connected to the first gas discharge channels 151b and 161b are formed at edges of the upper plate 301 and the lower plate 302. The first gas discharge channels 151b and 161b are formed on the inner surfaces of the first and second anode current collectors 151 and 161 in contact with the first and second anodes 121 and 122 and the second gas discharges. The channels 301b and 302b discharge CO ₂ gas, which is a by-product generated from the first and second anodes 121 and 122, to the outside. The first gas discharge channels 151b and 161b are formed between the fuel passage regions 151a and 161a of the first and second anode current collectors 151 and 161.

As shown in FIGS. 13 and 14, the first and second anode current collectors 151 and 161 are inserted into the inner surfaces of the upper plate 301 and the lower plate 302 so that the surfaces thereof are the upper plate 301 and the lower plate 302. Located on the same plane as the inner surface of the.

FIG. 15 is exaggeratedly expressed as a cross-sectional view taken along line E-E of FIG. 8.

Referring to FIG. 15, an upper gasket 201, an ion exchange membrane 101, and a lower gasket 202 are closely contacted between the upper plate 301 and the lower plate 302. The upper gasket 201 and the lower gasket 202 may include the first anode 121, the first cathode 131, and the second anode 122 attached to the first and second surfaces of the ion exchange membrane 101. The edge portion of the second cathode 132 is sealed. The first anode 121 and the first cathode 131 are in close contact with the first anode current collector plate 151 and the first cathode current collector plate 152 of the first current collector member 150. Reference numeral 122 and the second cathode 132 are in close contact with the second anode current collector 161 and the second cathode current collector 162 of the second current collector member 160, respectively. Fuels such as methanol and ethanol to the first and second anodes 121 and 122 are supplied through the fuel supply regions 302 and 302a of the upper plate 301 and the lower plate 302, and the first and second cathodes ( Air to the 131 and 132 is supplied through the air supply holes 303a and 305a of the air supply regions 303 and 305 of the upper plate 301 and the lower plate 302.

16 and 17 are perspective views illustrating respective inner surfaces of the upper plate 301 and the lower plate 302 on which the first current collecting member 150 and the second current collecting member 160 are installed. As shown in FIGS. 15 and 16, the surfaces of the first current collecting member 150 and the second current collecting member 160 may coincide with respective inner surfaces of the upper plate 301 and the lower plate 302. Current collector plate insertion grooves 301c and 302c into which the first current collector member 150 and the second current collector member 160 are inserted are formed. In addition, the lower plate 302 includes a second conductive portion 142a which electrically interconnects those formed integrally with the second anode current collector 161 and the second cathode current collector plate 162 in the second current collector 160. Is inserted into the conductive portion insertion groove 302d.

<< manufacturing process of the parts constituting the cell >>

Anode and cathode manufacturing

The fuel diffusion layer was prepared by squeezing a slurry made by mixing carbon black, IPA, and 60 wt.% PTFE (Polytetrafluoroethylene) on a water-repellent carbon paper, followed by drying in an oven at 120 ° C. for 2 hours. The catalyst slurry was prepared by mixing PtRu black catalyst (anode) or Pt black catalyst (cathode) with IPA solution and 5% Nafion solution and sonicating for uniform dispersion. The uniformly dispersed catalyst slurry was squeezed onto the fuel diffusion layer and then dried in an oven at 80 ° C. for 2 hours to prepare an electrode.

Membrane / Electrode Manufacturing

Nafion 115 membrane was used as the electrolyte membrane and pre-treated in H ₂ SO ₄ , H ₂ O ₂ and dried in a gel-dryer. The anode and cathode electrodes are cut into 2 * 1 cm ² , and each of them is arranged in two rows of six sheets on one side of the electrolyte membrane and the anode and cathode electrodes are arranged in pairs on the opposite side. A 12 cell membrane / electrode assembly was fabricated by hot-pressing for 5 minutes at.

Cellpack Manufacturing and Testing

The 12-cell ion exchange membrane was placed in a cell pack configured with an electrical circuit by a current collector, and tightened with a bolt to fabricate a cell pack. The fuel is supplied by capillary force (wicking) from the fuel storage and the oxygen is supplied through the air supply hole of the current collector in contact with the electrode. The operation of the cell pack is performed at room temperature and pressure and operates in an air-breathing form without a separate blower. The electrochemical properties and performance of the cell packs were measured by potentiostat / galvanostat.

18 is 2 * 1 cm² A graph showing the performance of a monopolar cell pack fabricated by stacking 12 electrodes of the size on the first and second surfaces of the ion exchange membrane. driving in breathing conditions. CellPack has a maximum performance of 150 mA (75 mA / cm) at 3.6 V (0.3 V per cell)²) And a maximum output of 551 mW at 3.3 V was obtained.

In the conventional monopolar cell pack, the electrical contact member connecting the unit cells passes through the ion exchange membrane, thereby causing a problem of leakage of liquid fuel. However, according to the present invention, when the electrodes are connected in series, the circuit does not pass through the electrolyte membrane and the electrical connection between the unit cells is made on the first and second surfaces of the ion exchange membrane, respectively, so that the electrode does not pass through the ion exchange membrane as conventionally. Therefore, fuel leakage by this structure does not occur. This feature of the present invention results in a very simple internal electrical circuit. In addition, since the current collector is in contact with the anode and the cathode instead of the entire part, the contact resistance can be considerably reduced, thereby greatly reducing the loss due to the resistance. Performance characteristics of the cell pack can be improved by smoothly discharging carbon dioxide, a reaction byproduct, through a gas discharge passage installed in the current collector.

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

Claims (10)

An upper plate and a lower plate maintaining a predetermined interval; An ion exchange membrane provided between the upper plate and the lower plate, the second plate having a first surface and a second surface corresponding to the first surface, and having a plurality of unit cell regions on the first and second surfaces; A plurality of first anodes provided for each unit cell region of the first surface of the ion exchange membrane and a plurality of first cathodes disposed in the unit cell region adjacent to each first anode; A plurality of second cathodes corresponding to each of the first anodes and a plurality of second anodes corresponding to each of the first cathodes, each unit cell region of the second surface of the ion exchange membrane; A first anode current collector plate and a second anode current collector plate disposed on upper surfaces of the first anode and the second anode, respectively, and having a fuel passage region formed thereon; A first cathode current collector plate and a second cathode current collector plate disposed on upper surfaces of the first cathode and the second cathode, respectively, and having air passage regions formed therein; A plurality of first conductive parts electrically connecting the first anode and the first cathode adjacent to each other on the first surface of the ion exchange membrane; A plurality of second conductive parts electrically connecting the second anode and the second cathode adjacent to each other on the second surface of the ion exchange membrane to electrically connect the cells provided in the unit cell regions; Single-electrode cell packs for direct methanol fuel cells. The method of claim 1, The upper and lower plates are provided with a fuel supply region for supplying fuel to the first and second anodes and an air supply region for supplying air to the first and second cathodes. Electrode cell pack. The method of claim 2, The first and second anodes and the first and second cathodes, respectively, and the first and second anode current collector plates respectively corresponding to the fuel supply regions provided in the upper and lower plates, respectively, The two-cathode current collector has a size corresponding to the air supply region provided in the upper plate and the lower plate, the single-electrode cell pack for direct methanol fuel cell. The method according to any one of claims 1 to 3, And the first conductive part is integrally formed with each of the first anode disposed on the first surface of the ion exchange membrane and the first cathode electrically connected thereto. The method according to any one of claims 1 to 3, And the second conductive portion is integrally formed with each second anode disposed on the second surface of the ion exchange membrane and a second cathode electrically connected thereto. The method of claim 4, wherein And the second conductive portion is integrally formed with each second anode disposed on the second surface of the ion exchange membrane and a second cathode electrically connected thereto. The method according to any one of claims 1 to 3 and 6, The inner surface of the upper plate is a single electrode cell pack for direct methanol battery, characterized in that the current collector insertion groove is formed is inserted into the first current collector member. The method according to any one of claims 1 to 3 and 6, The inner surface of the lower plate is a single anode cell pack for a direct methanol battery, characterized in that the second anode current collector, the second cathode current collector, and a current collector insertion groove and a conductive portion insertion groove into which the second conductive portion connecting thereto is formed. The method according to any one of claims 1 to 3 and 6, A plurality of first gas discharge channels are formed on each inner surface of the first anode current collector plate and the second anode current collector plate for discharging the by-products generated at the first anode and the second anode, and the upper and lower plates are formed on the inner surfaces of the upper plate and the lower plate. A single electrode cell pack for a direct methanol battery, characterized in that a plurality of second gas discharge channels connected to each first gas discharge channel are formed. The method according to any one of claims 1 to 3 and 6, An upper gasket and a lower gasket having a through hole corresponding to the first, second anode and the first, second cathode, etc. are provided between the upper plate and the ion exchange membrane and between the lower plate and the ion exchange membrane. Single electrode cell pack for methanol battery.