KR100720994B1 - Method for manufacturing of ultra-thin electric double layer capacitor - Google Patents

Abstract

A method of manufacturing a large capacity ultra thin electric double layer capacitor is provided.

Method for manufacturing an electric double layer capacitor according to the present invention comprises the steps of (a) forming a plurality of polarizing electrodes on the current collector film; (b) installing a gasket surrounding the periphery of each polarizing electrode; (c) opposedly placing two intermediate products produced by the process comprising the steps (a) and (b) with a separator therebetween; (d) heat-sealing the two gaskets so that the two intermediate products can be integrated; And (e) partially removing the current collector film such that the plurality of basic cells arranged in the longitudinal direction are electrically connected in series.

Electric double layer capacitors, current collectors, separators, gaskets, polarization electrodes

Description

Manufacturing method of ultra-thin electric double layer capacitor {METHOD FOR MANUFACTURING OF ULTRA-THIN ELECTRIC DOUBLE LAYER CAPACITOR}

1A is a diagram showing the configuration of a basic cell of a conventional electric double layer capacitor.

FIG. 1B is a diagram illustrating a configuration of a conventional electric double layer capacitor in which the basic cells of FIG. 1A are sequentially stacked.

2 is a view showing the configuration of a basic cell array of an ultra-thin electric double layer capacitor according to an embodiment of the present invention.

3 is a diagram conceptually illustrating a part of a method of manufacturing a basic cell array of an ultra-thin electric double layer capacitor according to an exemplary embodiment of the present invention.

The present invention relates to a method of manufacturing an ultra-thin electric double layer capacitor, and more particularly, to a method of manufacturing an electric double layer capacitor including a base cell array in which a plurality of base cells are disposed in a longitudinal direction.

In a typical capacitor, a dielectric material is interposed between two opposing electrodes to determine the capacitance accumulated in the capacitor according to the dielectric constant of the material. However, unlike other capacitors that use dielectrics, electric double layer capacitors form capacitors by distributing positive and negative charges at very short distances at the interface between two layers of solid and liquid.

The layer distributed at this interface is called an electric double layer, and the capacitor using the same is classified as an electric double layer capacitor.

By using a material having a larger surface area for the solid of the electric double layer capacitor, a large capacity can be obtained by forming many electric double layers. Therefore, an activated carbon powder or activated carbon fiber having a surface area of 1000 m 2 / g or more for the electric double layer capacitor and a rare sulfuric acid aqueous solution are used for the liquid, respectively. A high capacity capacitor can be obtained.

 Such an electric double layer capacitor is an energy storage device having an intermediate characteristic between an electrolytic capacitor and a secondary battery, and thus can be rapidly charged and discharged.

FIG. 1A is a diagram illustrating a configuration of a basic cell of a conventional electric double layer capacitor, and FIG. 1B is a diagram illustrating a configuration of a conventional electric double layer capacitor formed by sequentially stacking the basic cells of FIG. 1A.

Referring to FIG. 1A, a conventional electric double layer capacitor includes a sheet-shaped porous separator 11 and a pair of flat polarization electrodes arranged on the front and rear surfaces of the separator 11 in the thickness direction with the separator. (12, 12) and a pair of sheet current collectors 13, 13 arranged on the opposite side to the separator 11 of the polarizing electrodes 12, 12 in the thickness direction with the polarizing electrodes 12, 12; And a frame-shaped gasket 14 disposed around the direction orthogonal to the thickness direction of the separator 11 and the polarizing electrodes 12, 12 and interposed between the current collectors 13, 13, and The base cell 10 sealed with the electrolyte solution is provided.

The conventional electric double layer capacitor is constructed by stacking the basic cells 10 of the above-described structure in series as shown in FIG. 1B to obtain a desired withstand voltage and capacitance.

Referring to FIG. 1B, the electric double layer capacitor 1 is composed of one or more basic cells 10, which are shown as an example of a multilayer cell 20 in which the basic cells 10 are stacked in series in five layers. Electrode plates 21 each having a lead terminal are brought into close contact with the outer side of the current collectors 12 and 12 at both outer ends in the thickness direction of the base cell 10, and the entirety thereof is sheathed with an outer package 22. . The exterior step is usually performed under reduced pressure.

The electrode plate 21 with lead terminals is formed by soldering a copper surface, and has a flat electrode plate body 24 and a strip-shaped lead terminal 25 extending from the electrode plate body 24. The electrode plate main body 24 is bonded to the current collectors 13 and 13 at both ends in the stacking direction of the multilayer cell 20 through a conductive adhesive or the like.

The exterior package 22 consists of a laminated film which compounded aluminum and resin, and an insulating resin comprises an outer surface.

However, such a multilayered electric double layer capacitor 1 is not only cumbersome to stack a plurality of basic cells 10 with the current collector 13 as a contact portion in order to satisfy a desired withstand voltage or more, but also by lamination. It has been pointed out that when the thickness of the double layer capacitor 1 becomes thick and it is necessary to install a large capacity capacitor in a narrow space, it is difficult to meet this.

The present invention is to solve the above-mentioned conventional problems, an object of the present invention to provide a method of manufacturing an ultra-thin large capacity electric double layer capacitor.

In order to achieve the above object, the manufacturing method of the electric double layer capacitor according to the present invention, (a) forming a plurality of polarizing electrodes on the current collector film; (b) installing a gasket surrounding the periphery of each polarizing electrode; (c) opposedly placing two intermediate products produced by the process comprising the steps (a) and (b) with a separator therebetween; (d) heat-sealing the two gaskets so that the two intermediate products can be integrated; And (e) partially removing the current collector film such that the plurality of basic cells arranged in the longitudinal direction are electrically connected in series.

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Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment according to the present invention.

2 is a view showing the configuration of a basic cell array of an ultra-thin electric double layer capacitor according to an embodiment of the present invention.

Referring to FIG. 2, the basic cell array 20 of the electric double layer capacitor has a structure in which a plurality of basic cells 20a to 20f are arranged in the longitudinal direction. In the present exemplary embodiment, six basic cells 20a to 20f are arranged in the longitudinal direction, but the present invention is not necessarily limited thereto, and the basic cells according to the capacitance and withstand voltage desired by those skilled in the art are preferred. The number of 20a to 20f can be changed.

The basic cells 20a to 20f support the pair of polarization electrodes 22a and 22b, the separator 21 and the polarization electrodes 22a and 22b formed from the side of the separator 21 and the separator 21 therebetween. And a pair of current collectors 23a and 23b formed on the outer surfaces of the gaskets 24a and 24b and the polarizing electrodes 22a and 22b.

The separator 21 is preferably a non-electroconductive, ion-permeable porous film, but is not particularly limited thereto. The porous film may be, for example, a sheet-like material made of polypropylene, polyethylene, glass fiber, or the like.

The polarizing electrodes 22a and 22b are conductive, stable to the electrolyte, and preferably have a large surface area. For example, powdered activated carbon, fibrous activated carbon, and these activated carbons are solidified by binders such as Teflon and phenol resins. The impregnated electrolyte may be used for the solid-state polarized electrode. As the electrolyte solution, an organic electrolyte solution in which a quaternary ammonia salt is dissolved as an electrolyte in an organic solvent such as an aqueous solution solution in which sulfuric acid, potassium hydroxide or the like is dissolved in water, or propylene carbonate is used.

The gaskets 24a and 24b maintain the shape of the electric double layer capacitor to prevent leakage of the electrolyte and prevent short circuit due to contact between the upper and lower current collectors 23a and 23b. As the material of the gaskets 3a and 3b, for example, resins such as ABS, butyl rubber and polyolefin resin are used.

As the current collectors 23a and 23b, a conductive film having a structure in which conductive particles such as carbon particles are dispersed in a resin matrix such as styrene-ethylene-butylene-styrene copolymer can be used.

According to a feature of the present invention, the base cells 20a to 20f are not stacked in the thickness direction unlike conventional electric double layer capacitors, and are arranged in the longitudinal direction as shown, and housed in the base cells 20a to 20f. The whole 23a, 23b is partially removed.

More specifically, the one current collector 23b of the base cell 20a is connected in one direction to the one current collector 23b of another adjacent base cell 20b in the longitudinal direction, and the other current collector of the base cell 20a ( 23a is separated from the other current collector 23a of the other adjacent basic cell 20b. One current collector 23b of the basic cell 20b is separated from one current collector 23b of the other basic cell 20c, and the other current collector 23a of the basic cell 20b is the other basic current. The other current collector 23a of the cell 20c is connected in the longitudinal direction.

The basic cell array 20 of the present embodiment has a structure in which the above structure is repeatedly connected to each other and electrically connected in series. This is clearly distinguished in structure from a conventional electric double layer capacitor in which a plurality of basic cells are stacked in the thickness direction in that the basic cells 20a to 20f are arranged in the longitudinal direction on a plane, but the basic cells 20a to 20f are electrically connected to each other. In this regard, the basic cells stacked in the conventional electric double layer capacitor are electrically connected in series.

Hereinafter, with reference to the accompanying drawings, an embodiment of a method of manufacturing an electric double layer capacitor according to the present invention will be described.

 3 is a diagram conceptually illustrating a part of a method of manufacturing a basic cell array of an ultra-thin electric double layer capacitor according to an exemplary embodiment of the present invention.

As shown in FIG. 3A, first, a plurality of polarization electrodes 32 are formed on the current collector film 33. The polarizing electrode 32 is, for example, provided with a mask (not shown) on the top of the current collector film 33 and constitutes the polarizing electrode 32 through an opening formed in the mask, for example, powdered activated carbon. Or by spraying a mixture of a binder such as Teflon or phenol resin to the fibrous activated carbon to form a predetermined pattern, and dried using hot air or the like, and then thermocompression bonding using a roller (not shown) It may be formed, but need not be limited to this, various applications are possible by those skilled in the art.

The current collector film 33 is preferably a conductive film made of styrene-ethylene-butylene-styrene copolymer resin containing carbon powder, but is not limited thereto.

After the polarization electrode 32 is formed on the current collector film 33, the electrolyte is injected into the polarization electrode 32 in a vacuum as shown in FIG. 3B. The electrolyte may be an aqueous electrolyte solution in which sulfuric acid, potassium hydroxide or the like is dissolved in water, or an organic electrolyte solution in which a quaternary ammonia salt is dissolved as an electrolyte in an organic solvent such as propylene carbonate, but is not limited thereto. In the present embodiment, the electrolyte is injected before the installation of the gasket 34 described later. However, the electrolyte may be injected after the installation of the gasket 34 as necessary.

Next, as shown in Fig. 3C, for example, a frame-shaped gasket 34 having an opening capable of accommodating the polarization electrode 32 is provided. As the material of the gasket 34, for example, a resin such as ABS, butyl rubber, polyolefin resin, or the like may be used. Preferably, the gasket 34 is made of colorless transparent polyolefin resin.

Next, as shown in FIG. 3D, a separator 31 is provided on the gasket 34. In this case, it is preferable that a space is formed between the adjacent separators 31 and 31 to expose a portion of the upper surface of the gasket 34.

Next, as shown in FIG. 3E, intermediate products produced by the process of FIGS. 3A to 3C are installed to face each other with the separator 31 interposed therebetween. Then, the intermediate products are thermally compressed in the vertical direction such that the opposing gaskets 34 and 34 are bonded to each other with the separator 31 interposed therebetween to produce a structure as shown in FIG. 3F.

Finally, the current collectors 33 and 33 of the structure shown in FIG. 3F are partially removed alternately up and down to produce a basic cell array 30 as shown in FIG. 3G. At this time, in order to ensure insulation, a part of the gaskets 34 and 34 at the lower portion of the region where the current collectors 33 and 33 are removed is also preferably removed.

Although not shown, an external electrode is attached to a current collector on one side of a base cell disposed at both ends of the base cell array 30 thus formed, and packaging them to manufacture an electric double layer capacitor according to the present invention.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having various ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention. Additions should be considered to be within the scope of the following claims.

According to the present invention, it is easy to manufacture ultra-thin electric double layer capacitors that require more than a specific breakdown voltage.

In addition, since the electric double layer capacitor according to the present invention is ultra-thin, this can be satisfied even when a large capacity capacitor is required in a narrow space, and can be easily attached on a surface.

Claims (6)

delete delete (a) forming a plurality of polarizing electrodes on the current collector film; (b) installing a gasket surrounding the periphery of each polarizing electrode; (c) opposedly placing two intermediate products produced by the process comprising the steps (a) and (b) with a separator therebetween; (d) heat-sealing the two gaskets so that the two intermediate products can be integrated; And (e) partially removing the current collector film such that a plurality of basic cells arranged in a longitudinal direction are electrically connected in series. The method of claim 3, wherein And injecting an electrolyte solution into the polarization electrode between the steps (a) and (b). The method of claim 3, wherein And injecting an electrolyte solution into the polarization electrode between the steps (b) and (c). The method of claim 3, wherein The current collector film is a method of manufacturing an electric double layer capacitor, characterized in that the conductive resin film containing carbon powder.

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