KR20120004036A - Electric double layer capacitor and method for fabricating the same - Google Patents

Electric double layer capacitor and method for fabricating the same Download PDF

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Publication number
KR20120004036A
KR20120004036A KR1020100064681A KR20100064681A KR20120004036A KR 20120004036 A KR20120004036 A KR 20120004036A KR 1020100064681 A KR1020100064681 A KR 1020100064681A KR 20100064681 A KR20100064681 A KR 20100064681A KR 20120004036 A KR20120004036 A KR 20120004036A
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KR
South Korea
Prior art keywords
pressing member
lead assembly
electric double
double layer
lead
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Application number
KR1020100064681A
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Korean (ko)
Inventor
장동환
Original Assignee
(주)엡스코어
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Priority to KR1020100064681A priority Critical patent/KR20120004036A/en
Priority to CN2010102496450A priority patent/CN102315027A/en
Publication of KR20120004036A publication Critical patent/KR20120004036A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/13—Energy storage using capacitors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

The present invention relates to an electric double layer capacitor and a method of manufacturing the same, which can realize a large capacity capacitor by minimizing lead resistance by a natural oxide film in joining a plurality of leads. It comprises a plurality of polarizable electrodes arranged, a lead assembly which is an aggregate of leads provided at one end of each polarizable electrode, and a first pressing member and a second pressing member coupled to each other via the lead assembly; And, the first pressing member and the second pressing member is characterized in that the uneven layer is provided respectively.

Description

Electric double layer capacitor and method for fabricating the same

The present invention relates to an electric double layer capacitor and a method for manufacturing the same, and more particularly, to an electric double layer capacitor capable of realizing a large capacity capacitor by minimizing lead resistance by a natural oxide film in joining a plurality of leads. will be.

An electric double layer capacitor is a device that uses electric charges that accumulate in an electric double layer generated between a solid electrode and an electrolyte, and has a low energy density but superior characteristics in terms of power density and exceeds hundreds of thousands of times compared to a battery. It can be applied to various fields because of semi-permanent life.

The bilayer concept, the basic concept of an electric double layer capacitor, was first proposed by Helmholtz in 1879. Later, Guiy in 1910 and Chapman in 1913 proposed a model based on diffusion theory, and in 1924 Stern was based on Helmholtz Gui-Cchapman, It claims a complex form of dispersed layers. In regards to electric double layer capacitors, the first patent was filed by GE Becker in 1945 using Tar-lump black / H 2 SO 4 as a polarizable electrode, but it was not commercialized. In the 1970s, SOHIO in the United States and Matsushita Electric in Japan were involved in the capacitor-related business.In 1978, Matsushita Electric was using activated carbon as a polarizable electrode to commercialize organic electrolytes. It is actively underway.

In the electric double layer capacitor, a pair of solid electrodes are placed in an electrolyte ion solution and applied a direct current voltage, so that the positively polarized electrode is negatively charged and the negatively polarized electrode is positively charged. ) Is used to form an electric double layer at the interface between the electrode and the electrolyte. In particular, in the case of activated carbon, many pores are distributed to form an electric double layer. In determining the capacity of the electric double layer capacitor, the larger the specific surface area, the larger the dielectric constant of the electrolyte, and the smaller the ion radius in the formation of the double layer, the larger the capacity can be obtained. In addition, the capacity is determined by the equivalent series resistance of the electrode, the relationship between the pore distribution of the electrode and the electrolyte ions, the breakdown voltage, and the like.

Looking at the structure of an electric double layer capacitor using activated carbon, a plurality of polarizable electrodes made of activated carbon are repeatedly arranged with a separator interposed therebetween, and one end of each polarizable electrode is provided with a terminal and a lead. In addition, the leads are electrically connected by welding or pressing using a medium.

In the conventional electric double layer capacitor using activated carbon, in order to maximize the capacitance of the capacitor, the resistance in the electrical path between the lead and the activated carbon should be minimized, and for this purpose, the resistance at the junction where a plurality of leads are joined should be small. .

As described above, in the conventional case, a welding method or a crimping method using a medium is selected as a method of joining a plurality of leads. The welding method requires an additional process of welding and increases resistance due to by-products generated in the welding process. There is such a problem. In addition, in the crimping method using a medium, when the number of leads to be joined is less than 10, the electrical connection is smoothly performed, but when the number of leads is more than tens, there is a problem that the electrical bonding characteristics are deteriorated. This is because the lead is usually made of a metal such as aluminum (Al), a natural oxide film having a small thickness (Al 2 O 3, etc.) is formed on the surface of the lead, and as the number of leads increases, the resistance by the natural oxide film is inevitable. Because. The increase in lead resistance due to the natural oxide film serves as a challenge in implementing a large capacity capacitor.

The present invention has been made to solve the above problems, to provide an electric double layer capacitor and a method of manufacturing the same that can realize a large capacity capacitor by minimizing the lead resistance by the natural oxide film in the joining of a plurality of leads. There is this.

An electric double layer capacitor according to the present invention for achieving the above object is a plurality of polarizable electrodes disposed between the separation membrane, a lead assembly which is an aggregate of leads provided at one end of each polarizable electrode, and the lead And a first pressing member and a second pressing member coupled to each other with the assembly interposed therebetween, wherein the first pressing member and the second pressing member are each provided with an uneven layer.

A fastening protrusion may be provided on the first crimping member, a fastening groove having a shape corresponding to the fastening protrusion may be provided on the second crimping member, and a perforation part fitted to the fastening protrusion may be provided on the lead assembly. In addition, when the first pressing member and the second pressing member is fastened, the uneven layer of the first pressing member and the uneven layer of the second pressing member have a form of engaging with each other.

The uneven layer may have a structure in which the polygonal pyramid is repeated, arranged, the height of the uneven layer may be greater than the thickness of the lead assembly. In addition, a case for providing a space in which the electrolyte is filled is further provided, the first pressing member may be fixed to the upper portion of the case.

The plurality of polarizable electrodes are divided into a plurality of first polarizable electrodes polarized by (+) and a plurality of second polarizable electrodes polarized by (−), and the lead assembly is configured as the first first component. A first lead assembly, which is an assembly of first leads provided at one end of the polar electrode, and a second lead assembly, which is an assembly of second leads provided at one end of each of the second polarizable electrodes; The assembly and the second lead assembly may be compressed by the first pressing member and the second pressing member, respectively.

According to an aspect of the present invention, there is provided a method of manufacturing an electric double layer capacitor, comprising: a plurality of polarizable electrodes arranged with a separator interposed therebetween, and an electrode assembly including a lead assembly which is an assembly of leads provided at one end of each polarizable electrode. And a step of pressing the first pressing member and the second pressing member in a state in which the lead assembly is provided between the first pressing member and the second pressing member, wherein the first pressing member is pressed. And an uneven layer of each of the second pressing members, wherein the uneven layer of the first pressing member and the uneven layer of the second pressing member are engaged with each other when the first pressing member and the second pressing member are pressed. It is done.

An electric double layer capacitor and a method of manufacturing the same according to the present invention have the following effects.

By pressing and connecting a lead assembly having a plurality of leads assembled through a pressing member having an uneven layer, the natural oxide film on the surface of the lead is destroyed, thereby minimizing the resistance of the lead. In addition, as the lead resistance decreases, the number of leads constituting the lead assembly can be increased, thereby facilitating the implementation of a large capacity capacitor.

1 is a perspective view of an electric double layer capacitor according to an embodiment of the present invention.
Figure 2 is a perspective view of the electrode body and the crimping structure according to an embodiment of the present invention.
3 is a cross-sectional view showing a lead assembly and a crimping structure according to an embodiment of the present invention.
Figure 4a is a reference diagram showing a crimped state of the electric double layer capacitor according to the prior art.
Figure 4b is a reference diagram showing a crimped state of the electric double layer capacitor according to an embodiment of the present invention.

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

Referring to FIG. 1, an electric double layer capacitor according to an embodiment of the present invention includes a case 10, an electrode body 100 provided in the case 10, and the case 10, which largely define an internal space of the capacitor. It is made of a combination of electrolytes (not shown) that are filled inside.

The electrode body 100 includes a plurality of first polarizable electrodes 110 polarized by (+), a plurality of second polarizable electrodes 120 polarized by (−), and a separator 130. do. Specifically, as shown in FIGS. 2 and 3, the first polarizable electrode 110 and the second polarized electrode 120 are alternately arranged alternately with the separator 130 interposed therebetween, and may be made of activated carbon. have. In addition, a first terminal 111 is provided at one side of each first polarizable electrode 110, and a first lead 112 is provided at one end of each first terminal 111. Each of the second polarizable electrodes 120 is also provided with a second terminal 121 at one side thereof, and a second lead 122 is provided at one end of each second terminal 121. In this case, it is preferable that the positions of the first terminal 111 of the first polarizable electrode 110 and the second terminal 121 of the second polarizable electrode 120 are different from each other. The first lead 112 and the plurality of second leads 122 are drawn out at different positions. Hereinafter, the plurality of first leads 112 and the plurality of second leads 122 will be referred to as a first lead assembly 210 and a second lead assembly 220, respectively.

In order to effectively supply power to the plurality of first polarizable electrodes 110 and the second polarizable electrodes 120 through the first lead assemblies 210 and the second lead assemblies 220, the first lead assemblies ( 210, the plurality of first leads 112 and the plurality of second leads 122 constituting the second lead assembly 220 should be electrically connected to each other and the resistance should be minimized. Is provided with a crimping structure.

The crimping structure consists of a combination of the first crimping member 140 and the second crimping member 150 of a conductive material. The first crimping member 140 and the second crimping member 150 are compressed and coupled by an external physical force with the first lead assembly 210 or the second lead assembly 220 interposed therebetween. The fastening protrusion 142 is provided on the first pressing member 140, and the second pressing member 150 is provided with a fastening groove 152 having a shape corresponding to the fastening protrusion 142. In addition, the first lead assembly 210 or the second lead assembly 220 interposed between the first pressing member 140 and the second pressing member 150 is provided with perforations 112a and 122a, The first pressing member 140 and the second pressing member (140) of the first lead assembly 210 or the second lead assembly 220 are fitted to the fastening protrusion 142. 150) is pressed. For reference, the pressing of the first pressing member 140 and the second pressing member 150 may be achieved by applying a pressure of 1 to 3 ton / cm 2 using a hydraulic press.

Meanwhile, a key feature of the inventive concept is to minimize lead resistance in the first lead assembly 210 and the second lead assembly 220. The first crimping member 140 is configured to implement this. And uneven layer 141, 151 is provided on the second pressing member 150, respectively. The uneven layer 141, 151 is a polygonal pyramid, such as triangular pyramid, square pyramid pyramid (141a) 151a is repeatedly disposed adjacent to, when the first pressing member 140 and the second pressing member 150 is combined The uneven layer 141 of the first pressing member 140 and the uneven layer 151 of the second pressing member 150 should be designed to have a form in which they are engaged with each other.

As such, the first crimping member 140 and the second crimping member 150 are combined in a concave-convex shape, and include a first lead assembly provided between the first crimping member 140 and the second crimping member 150 ( 210 or the second lead assembly 220 is provided along the uneven surface (a surface formed by joining the uneven layer 141 of the first pressing member 140 and the uneven layer 151 of the second pressing member 150). According to the structure, the area in which the first lead assembly 210 or the second lead assembly 220 is in contact with the pressing member is increased, and the second uneven layers 141 and 151 are formed on each lead surface. The formed natural oxide film is destroyed, so that the electrical resistance of the lead may be reduced. Here, when the lead is made of aluminum (Al), the natural oxide film means Al 2 O 3 .

Referring to FIG. 4A, as the mediator 420 of the plane presses the leads 410 in the related art, the natural oxide film 411 on the surface of the lead 410 is maintained as it is so that the resistance of the lead resistance by the natural oxide film 411 is maintained. Although an increase is inevitable, in the case of the present invention, as shown in FIG. 4B, the natural oxide film is destroyed by the uneven layers 141 and 151, thereby minimizing the resistance loss caused by the natural oxide film.

Meanwhile, in order to effectively destroy the natural oxide film on the lead surface, the height of the uneven layers 141 and 151 should be greater than the thickness of the first lead assembly 210 or the second lead assembly 220. Under these conditions, the height and length of the polygonal pyramids 141a and 151a constituting the uneven layers 141 and 151 may be variously designed. In addition, the pressing of the first pressing member 140 and the second pressing member 150 may use a hydraulic press, the first pressing member 140 and the second pressing member by applying a pressure of 1 to 3 ton / cm 2 . 150 can be crimped.

In the coupling between the crimping structure and the case 10, the first crimping member 140 is fixed to the upper portion of the case 10, and the first crimping member 140 is prevented from leaking the electrolyte. Packing member 11 may be further provided on the periphery. At this time, the case 10 and the first pressing member 140 may be fixed through the screw coupling (12).

10 case 100 electrode body
110: first polarizable electrode 111: first terminal
112: first lead 112a: perforation
120: second polarizable electrode 121: second terminal
122: second lead 122a: perforation
130 separation membrane 140 first pressing member
141, 151: Uneven layer 141a, 151a: polygonal pyramid
142: fastening protrusion 150: second pressing member
152: fastening groove
210: first lead assembly 220: second lead assembly

Claims (10)

A plurality of polarizable electrodes disposed with the separator interposed therebetween;
A lead assembly which is an assembly of leads provided at one end of each polarizable electrode;
It comprises a first pressing member and a second pressing member coupled to the lead assembly therebetween,
An electric double layer capacitor, characterized in that the uneven layer is provided on the first pressing member and the second pressing member, respectively.
The method of claim 1, wherein the first pressing member is provided with a fastening protrusion, the second pressing member is provided with a fastening groove having a shape corresponding to the fastening protrusion, and the perforated part fitted to the fastening protrusion on the lead assembly. Electric double layer capacitor, characterized in that provided.
The electric double layer capacitor of claim 1, wherein the concave-convex layer of the first crimping member and the concave-convex layer of the second crimping member are engaged with each other when the first crimping member and the second crimping member are fastened.
The electric double layer capacitor according to claim 1, wherein the uneven layer has a structure in which polygonal pyramids are repeatedly arranged.
The electric double layer capacitor according to claim 1, wherein a height of the uneven layer is larger than a thickness of the lead assembly.
The electric double layer capacitor of claim 1, further comprising a case providing a space in which an electrolyte is filled, wherein the first pressing member is fixed to an upper portion of the case.
The method of claim 1, wherein the plurality of polarizable electrodes are divided into a plurality of first polarized electrodes polarized with (+) and a plurality of second polarizable electrodes polarized with (-),
The lead assembly is a first lead assembly which is an assembly of first leads provided at one end of each of the first polarizable electrodes, and a second lead assembly which is provided at one end of each of the second polarizable electrodes. Divided into 2 lead assemblies,
And the first lead assembly and the second lead assembly are respectively pressed by the first pressing member and the second pressing member.
Preparing an electrode body including a plurality of polarizable electrodes disposed with a separator interposed therebetween, and a lead assembly which is an assembly of leads provided at one end of each polarizable electrode;
And pressing the first pressing member and the second pressing member in a state where the lead assembly is provided between the first pressing member and the second pressing member.
Concave-convex layers of each of the first pressing member and the second pressing member are provided, and when the first pressing member and the second pressing member are pressed, the uneven layer of the first pressing member and the uneven layer of the second pressing member are engaged with each other. Method of manufacturing an electric double layer capacitor, characterized in that the form.
The method of claim 8, wherein the first pressing member is provided with a fastening protrusion, the second pressing member is provided with a fastening groove having a shape corresponding to the fastening protrusion, between the first pressing member and the second pressing member The lead assembly provided in the lead assembly is provided with a perforation, the method of manufacturing an electric double layer capacitor, characterized in that the pressing of the first pressing member and the second pressing member in the state that the perforated portion of the lead assembly is fitted to the fastening projections.
The method of claim 8, wherein the height of the uneven layer is larger than the thickness of the first lead assembly or the second lead assembly.
KR1020100064681A 2010-07-06 2010-07-06 Electric double layer capacitor and method for fabricating the same KR20120004036A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020100064681A KR20120004036A (en) 2010-07-06 2010-07-06 Electric double layer capacitor and method for fabricating the same
CN2010102496450A CN102315027A (en) 2010-07-06 2010-08-10 Electric double layer capacitor and method for fabricating the same

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Application Number Priority Date Filing Date Title
KR1020100064681A KR20120004036A (en) 2010-07-06 2010-07-06 Electric double layer capacitor and method for fabricating the same

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KR20120004036A true KR20120004036A (en) 2012-01-12

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KR20220000673A (en) * 2020-06-26 2022-01-04 삼성에스디아이 주식회사 Rechargeable battery

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JP2009087612A (en) * 2007-09-28 2009-04-23 Sanyo Electric Co Ltd Layered battery

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