KR101067240B1

KR101067240B1 - Electric double layer capacitor

Info

Publication number: KR101067240B1
Application number: KR1020080120835A
Authority: KR
Inventors: 김기효; 박종온; 조연식
Original assignee: 삼화전기주식회사
Priority date: 2008-12-02
Filing date: 2008-12-02
Publication date: 2011-09-27
Also published as: KR20100062279A

Abstract

Disclosed is an electric double layer capacitor for realizing ultra low resistance by directly connecting a current collector and a terminal part in a method of connecting a current collector and a terminal part of a conventional winding element using a lead wire. In the electric double layer capacitor according to the present invention, the terminal plates of the negative electrode and the positive electrode are respectively in contact with the metal current collectors used as the inner lead wires, and both terminal plates are connected by a crimping bolting method to have ultra low resistance and high energy density.

Description

Electric double layer capacitor

The present invention relates to an electric double layer capacitor, and more particularly, an electric double layer that can improve mass production efficiency, improve energy density by improving the capacitor by a bolting method, and facilitate the series or parallel connection of cells. Relates to a capacitor.

In general, in the case of an electric double layer capacitor, as shown in FIG. 1, the lead wire 20 is attached to the specific position of the electrode 10 by cold pressing, stitching, and the like, and then the riveted lead wire after winding. Connecting to the external terminal 30 by the same method of welding and injecting the electrolyte after sealing is used a lot.

However, in the case of a capacitor having a large capacity, in order to reduce the resistance generated in the current collector, as shown in FIG. 2, a plurality of lead wires 20 are attached to the metal current collector 10 and then connected to the external terminal. At this time, when increasing the number of lead wires to reduce the resistance, the spacing of each lead wire should be properly adjusted so that the lead wires of the positive and negative poles are gathered at a certain position after winding, and the number of lead wires may be increased to reduce the resistance. In order to adjust the spacing of each lead wire so that the lead wires are gathered at a predetermined position, there is a problem that the process involves a very complicated process.

In order to solve this problem, International Application No. PCT / CH2003 / 00847 (Korean Patent Publication No. 10-2007-0011255 (2007.01.24)) has a positive electrode 20a and a negative electrode 20b as shown in FIGS. 3 and 4. ) By staggering the position and winding it so that one end of the winding body 10 is drawn out only the positive electrode and the other end is taken out only the negative electrode, and the anode and the cathode of the drawn end is welded to the terminal 30, respectively, The structure to combine is shown.

This patent discloses improved resistance characteristics compared to capacitors as shown in FIGS. 1 and 2 by using a metal current collector as an inner lead, but polarity can be configured only up and down, and a process of welding a terminal with a laser is required. Falling, the intermediate terminal plate for laser welding is additionally required because the current collector and the intermediate terminal plate 40 is melted by laser welding, and the current collector melts and requires sufficient current collector space for welding. The current collector space required for such welding has a problem of reducing energy density.

The present invention has been made to solve the above problems, the contact between the terminals of the negative electrode and the positive electrode to the metal current collector used as the inner lead wire, respectively, by fastening both terminals with a long bolt to improve the adhesion between the terminal and the metal current collector It is to provide an electric double layer capacitor that can be increased.

The present invention to solve the above problems,

In the electric double capacitor, which is formed by closely contacting the terminal plate to the upper and lower portions of the winding body from which the inner lead wire is drawn out to the upper and lower portions,

The terminal plates provide an electric double capacitor which is fastened by long bolts passing through the core of the winding body.

At this time, the long bolt may be a non-conductor, a conductor may be used, it is preferable that the insulating washer is inserted between the long bolt and the lower terminal plate when the conductor is used.

At this time, the upper terminal plate is formed with a first terminal rod protruding upwards, the lower terminal plate is provided with a bi-directional type on the lower surface of the case is formed so that the second terminal rod protrudes downward on the lower surface of the case. .

Or, the present invention,

In the electric double capacitor, which is formed by bringing the terminal plate in close contact with the upper and lower portions of the winding body from which the inner lead wires are drawn up and down, respectively,

The terminal plates are coupled by long bolts passing through the core of the winding body, wherein the first terminal rods formed on the upper terminal plate are moved laterally, and the long bolts are coupled to the second terminal rods while passing through the upper terminal plate. Provides an electrical double capacitor.

On the other hand, a protrusion is formed on the contact surface of the terminal plates in contact with the inner lead wire can increase the adhesion.

In addition, a tube may be built in the core part of the winding body.

As described above, the electric double layer capacitor according to the present invention can increase the mass production efficiency by replacing the doubled laser welding process with simple bolting as in the prior art, and requires an intermediate terminal plate required for laser welding and a current collector space for welding. There is an advantage that the space between the electrode and the case (terminal) is reduced to improve the energy density than the prior art.

In addition, the present invention has a feature that the terminal can be withdrawn in one direction or in both directions, it is easy to connect the cells in series or in parallel.

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

The electric double layer capacitor according to the present invention is classified into a bidirectional type and a unidirectional type according to the output direction of the terminal. That is, the bidirectional type is a type that allows the terminals of the cathode and the anode to be drawn out to the upper and lower portions of the capacitor, and is useful for parallel connection of cells, and the one-way type is one of the upper and lower portions of the capacitor. It is a type that allows all terminals to be drawn out. It is useful for series connection of cells.

First, the bidirectional type of the electric double layer capacitor according to the first embodiment of the present invention will be described.

5 is a view showing an electric double layer capacitor according to a first embodiment of the present invention, Figure 6 is a view showing a changeable structure according to the material of the long bolt.

Referring to FIG. 5, the electric double layer capacitor 100 according to the first embodiment of the present invention includes a winding body 110 and a winding body 110 to which the electrodes of the cathode and the anode are led to the inner lead wires, respectively, as the upper end and the lower end. Upper and lower terminal plates (120, 130) attached to the upper and lower portions of the long bolt 140 and the lower terminal plate 130 is fastened to both terminal plates (120, 130) through the center of the winding body 110, It includes a conductive case 150 wrapped from the bottom of the upper terminal plate 120.

In this case, the first terminal rod 121 is integrally formed on the upper terminal plate 120. The lower surface of the lower terminal plate 130 protrudes to be in contact with the case 150, and the second terminal rod 151 is integrally formed on the lower surface of the case 150. Here, the lower terminal plate 130 does not serve as a terminal like the upper terminal plate 120, but is used as a means for close contact with the inner lead wire of the winding body 110.

In addition, the upper portion of the case 150 is curled (Curling) to the upper terminal plate 120, but is coupled so as not to be energized by sandwiching the insulating material 160.

The long bolt 140 is made of a non-conductor so that the upper terminal plate 120 and the lower terminal plate 130 are not energized with each other.

Therefore, in the electrical double layer capacitor 100 according to the first embodiment of the present invention, a positive electrode is introduced into the lower second terminal rod 151 of the case 150, and the first terminal of the upper side of the case 150 is inputted. The negative electrode is extracted from the rod 121.

Meanwhile, as shown in FIG. 6, when the long bolt 140 'is manufactured in consideration of the case in which the long bolt 140' is manufactured as a conductor, the upper terminal plate 120 and the lower terminal plate 130 are energized. It becomes possible. Therefore, in order to prevent this, the insulating washer 145 may be inserted between the lower side of the long bolt 140 'and the lower terminal plate 130 to prevent energization.

7 is a cross-sectional view illustrating an electric double layer capacitor according to a second embodiment of the present invention.

Referring to FIG. 7, the electric double layer capacitor 200 according to the second embodiment of the present invention has a winding body 210 in which the electrodes of the cathode and the anode are drawn out to the inner lead wires as the upper and lower portions, respectively, as in the first embodiment. Equipped.

At this time, the upper terminal plate 220 is attached to the upper portion of the winding body 210 as in the first embodiment, and the lower terminal plate 230 is attached to the lower portion of the winding body 210. Here, the upper terminal plate 220 is formed such that the first terminal bar 221 is not positioned at the center thereof, but is moved laterally. Unlike the first embodiment, the lower terminal plate 230 is formed such that the lower terminal plate 230 does not protrude downward so as not to contact the case 250.

The long bolt 240 penetrating the winding body 210 is coupled to the upper terminal plate 220 and the lower terminal plate 230 attached as described above. At this time, the long bolt 240 is the lower portion is in contact with the lower terminal plate 230 to conduct electricity, so that the upper terminal plate 220 is not penetrated so as to penetrate.

The second terminal rod 270 having a different polarity is coupled to the upper end of the long bolt 240, and the upper end of the case 250 is stacked on the insulating materials 260 and curled.

The electric double layer capacitor 200 according to the second embodiment of the present invention formed as described above has the second terminal rod 221 of the (-) pole and the first terminal rod of the (+) pole above the winding body 210. 270 is used as the one-way type protruding.

8 is a view for showing the projection formed on the contact surface of the terminal plate according to the present invention.

Meanwhile, the terminal plates 120, 130, 220, and 230 used in the first and second embodiments of the present invention maintain very close contact with the inner lead wires folded on the upper and lower portions of the winding bodies 110 and 210. For example, as shown in FIG. 8, the projections 300 are formed to protrude throughout the entire region.

In addition, the tube 310 may be inserted into the core portion of the winding bodies 110 and 210 so as not to contact the long bolts 140 and 240 passing through the shaft center.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined by the appended claims. .

1 is a schematic structural diagram showing a general electric double layer capacitor,

Figure 2 is a perspective view showing the structure of the winding body of Figure 1,

3 is a perspective view showing a winding body of a further improved electric double layer capacitor,

4 is a cross-sectional view showing the structure of the winding body of FIG.

5 is a view showing an electric double layer capacitor according to a first embodiment of the present invention,

6 is a view showing a changeable structure according to the material of the long bolt,

7 is a cross-sectional view showing an electric double layer capacitor according to a second embodiment of the present invention, and

Claims

In the electric double capacitor, which is formed by bringing the upper terminal plate and the lower terminal plate in close contact with the upper and lower portions of the winding body to which the inner lead wire is drawn out to the upper and lower, respectively,

The case in which the winding body is accommodated is conductive and its bottom surface is energized while the upper terminal plate is energized so that the upper part is insulated from the upper terminal plate, and the upper terminal plate is formed with a first terminal rod protruding upward, and the lower portion of the case And a second terminal rod protruding downward on the surface thereof, wherein the terminal plates are screwed to press the winding bodies by long bolts passing through the winding portion of the winding body.

The electric double capacitor of claim 1, wherein the long bolt is made of an insulator.

The electric double capacitor of claim 1, wherein a conductor is used as the long bolt, and an insulating washer is inserted between the long bolt and the lower terminal plate.

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In the electric double capacitor, wherein the upper body and the lower terminal plate is in close contact with the upper and lower portions of the winding body from which the inner lead wires are drawn out to the upper and lower portions, respectively, so that the winding body is embedded in the case.

The upper terminal plate is formed integrally by moving the first terminal bar to the side, the upper surface of the upper terminal plate is formed of an insulating material, the upper portion of the case is cured by the insulating material, the insulating material and the first terminal rod A second terminal rod is embedded to be spaced apart from each other, and the second terminal rod is screwed with a conductive long bolt penetrating the winding body and the upper terminal plate from the lower terminal plate so that the terminal plates press the winding body, and the first terminal. The rod is a (+) pole and the second terminal rod is a negative pole, characterized in that the one-way type of the terminal rods protruding to the upper side of the insulating material to the (-) pole.

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