KR20150059411A - Capacitor of Irregular Structure - Google Patents

Abstract

The present invention provides a capacitor which includes a laminate with a structure on which an anode, a cathode, and a dielectric element interposed between the anode and the cathode are vertically laminated and a case which receives the laminate. The polarity of the uppermost electrode of the laminate is opposite to the polarity of the lowermost electrode of the laminate. Each of the electrodes is connected to an external input and output terminal. The laminate has a polygonal shape on a planar view or a curved shape on at least one side thereof.

Description

Capacitor of Irregular Structure < RTI ID = 0.0 >

More particularly, the present invention relates to a laminate having a structure in which a positive electrode, a negative electrode, and a dielectric interposed between the positive electrode and the negative electrode are laminated on top and bottom, and a case for housing the laminate Wherein the uppermost electrode and the lowermost electrode of the laminate are electrodes having opposite polarities and each connected to an external input / output terminal of the capacitor, wherein the laminate has a polygonal shape in plan view or a polygonal shape in at least one side And a capacitor formed on the substrate.

Capacitors are emerging as a next-generation battery that connects lithium-ion batteries based on long lifetime, short charge time, and high electrical efficiency.

Generally, a lithium ion battery produces electricity by a chemical reaction such as oxidation and reduction of a cathode material and an anode material, and a capacitor has a much longer life than a lithium ion battery because electricity is produced by physical adsorption / desorption on the surface of activated carbon.

In addition, despite its disadvantages of low resistance and high power density and short response time, it is equipped in many devices and plays various roles.

In general, a capacitor is a device for accumulating electric charges when a voltage is applied and exhibits high output characteristics. Typical electrochemical capacitors are divided into electric double-layer capacitors (EDLC) and pseudo-capacitors . The electric double layer capacitor is a device for storing electric charges by charging ions on an electrolyte and electrons on an electrolyte in an electric double-layer formed at an interface between an electrode and an electrolyte. The similar capacitor is a device for storing electric charge by using a Faraday reaction. It is a device that stores electrons near the surface.

Such a capacitor is manufactured in a form in which a stacked structure of electrodes and a dielectric is housed in a cylindrical or rectangular case and mounted on the device.

However, in recent years, a new type of capacitor is required due to a slim type or various design trends. Specifically, with the miniaturization and thinning of the device, there is a need for a capacitor that can be mounted with an efficient structure even when the storage space of the capacitor does not have sufficient margin.

In addition, although a conventional device is manufactured in a substantially rectangular parallelepiped shape, recently, a device having various external shapes has been developed. Generally, in the case of a capacitor having a rectangular parallelepiped shape or a cylindrical shape, There is a problem that it is difficult to be generated.

Therefore, there is a high need for a capacitor having a structure capable of increasing the mounting efficiency even in a device having various structures.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems of the prior art and the technical problems required from the past.

More specifically, it is an object of the present invention to design a capacitor so as to be mounted in various spaces of a device to maximize the utilization of the internal space of the device, to move away from the external structure of a device having a generally rectangular structure, A capacitor can be mounted efficiently even in a device having a capacitor.

According to an aspect of the present invention, there is provided a capacitor comprising:

1. A capacitor comprising: a laminate having a structure in which an anode, a cathode, and a dielectric interposed between the anode and the cathode are stacked on top and bottom; and a case for housing the laminate,

The uppermost electrode and the lowermost electrode of the laminate are electrodes having opposite polarities and are respectively connected to external input / output terminals of the capacitor;

The laminate may be a flat polygonal shape or a curved shape at least on one side.

Unlike an electrode assembly of a battery in which electrodes are stacked and protruded electrode taps are connected to each other in a structure in which electrodes are coupled to each other, only the uppermost and lowermost electrodes of the stacked electrodes are connected to the outside, The electrode layers can be separated from each other with a dielectric interposed therebetween. With this structure, the capacitor can be manufactured in various forms.

Since the capacitor according to the present invention is formed in an amorphous structure including a polygonal shape or a curved surface in a planar shape deviating from the conventional general cylindrical or rectangular parallelepiped structure, It is possible to maximize the utilization of the internal space of the device.

In one specific example, the external input / output terminal of the capacitor may be connected only to the electrodes between the uppermost electrode and the lowermost electrode. That is, the electrodes between the uppermost electrode and the lowermost electrode may not have an external input / output terminal connected thereto. Accordingly, the currents of the capacitors can be formed to flow outward through the uppermost electrode and the external input / output terminal connected to the lowermost electrode.

According to the above-described structure, the capacitor according to the present invention can be manufactured in various shapes such as a plane shape or a vertical sectional shape.

In the first example of the various shapes, the laminate may be formed into a polygonal shape in plan view. The shape of the polygon is not particularly limited and may be various shapes, and various structures such as a triangle, a rectangle, a pentagon, and a hexagon are possible, and a star polygon is also possible.

In the second example, the laminate has a cathode terminal and a cathode terminal protruding in a plane on the first outer circumferential surface for connection with the external input / output terminal, and the second outer circumferential surface opposed to the first outer circumferential surface has a curved surface As shown in FIG.

In this case, the first outer circumferential surface may be linear, and the curvilinear shape of the second outer circumferential surface may be formed in an arc shape whose center point is directed toward the outer circumferential surface of the first side.

The radius of the arc may be, for example, 50 to 300% of the length of the first side circumferential surface, and may be a structure having the same center point at every part of the arc. Conversely, Or may be a structure in which the center point is formed at another position. That is, the shape of the arc is not limited and may be formed in various shapes.

In the third example, the laminate may have a curved shape with at least one corner in a plan view. In other words, the laminate may have a curved surface at a part of a flat surface, a curved surface at all corners, or a planar asymmetric structure when some corners are curved.

Specifically, the laminate may have an asymmetric structure with respect to a center axis crossing the laminate in a plane, and the asymmetric structure may be formed as a curved portion having the curved surface shape.

In this case, the curved portion may be formed of one or more arcs, and the convex portions of the arcs may be formed to face the outer surface of the laminate.

In a fourth example, the laminate may have a structure in which a depressed portion formed inward is formed on one side of the laminate body in a plane. The shape of the depressed portion is not particularly limited, and may be formed in various shapes such as a polygonal structure, a curved structure, or a structure in which polygonal and curved surfaces are mixed.

As described above, the capacitor according to the present invention can be manufactured in a variety of shapes in a plan view, and the capacitor can also be manufactured in a structure in which a step is formed in a vertical section as follows.

In one specific example, the laminate includes two or more anodes, two or more cathodes, and two or more dielectrics, wherein one anode, one dielectric, and one cathode form one unit, And may be formed in a structure having a different plane size so as to form a step on the outer surface of the body. In this case, the unit bodies may have the same height.

The case for housing such a laminate may also have a structure in which stepped steps are formed corresponding to the outer shape of the laminate.

At least two of the widths (width) and width (length) of the two or more unit pieces having different planar sizes may have different structures.

As described above, the stacked body of various shapes constituting the capacitor of the present invention has been described, but it is needless to say that various modifications and combinations thereof are possible.

The present invention also provides a secondary battery pack including the capacitor as an auxiliary power source.

The present invention also provides a device including the capacitor, wherein the device is a portable device such as a notebook computer, a mobile phone, a camera, a toy, a PDP, a PMP, an MP3 player, a digital still camera (DSC), a smart phone, Video, an uninterruptible power supply (UPS), an automobile, an electric vehicle, a hybrid electric vehicle, or a power storage device.

The structure of these devices and their fabrication methods are well known in the art, and a detailed description thereof will be omitted herein.

As described above, since the capacitor according to the present invention is manufactured in various forms so as to be mounted in various spaces of the device, it is possible to maximize the utilization of the internal space of the device and to deviate from the external structure of the device having a generally rectangular structure It is possible to efficiently mount the device even in a device having various external shapes, thereby providing an effect of maximizing the capacity or output of the capacitor.

1 is a vertical cross-sectional schematic diagram of a capacitor according to one embodiment of the present invention;
2 is a plan view of a capacitor according to another embodiment of the present invention;
3 is a plan view of a capacitor according to another embodiment of the present invention;
4 is a plan view of a capacitor according to another embodiment of the present invention;
5 is a plan view of a capacitor according to another embodiment of the present invention;
6 is a vertical cross-sectional view of a capacitor according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

Hereinafter, for convenience of explanation, the structure of a laminated body, an external input / output terminal, a casing, and the like is schematically shown except for the other components of a general capacitor.

1 is a schematic vertical sectional view of a capacitor according to an embodiment of the present invention.

1, a capacitor includes a capacitor case 120, a capacitor 114, and a cathode 116. The capacitor 110 is formed by vertically stacking an anode 112, a dielectric 114, Respectively. The uppermost electrode 112a of the laminate 110 is an anode and the lowermost electrode 116a is a cathode. The anode 112a positioned at the uppermost stage and the cathode 116a located at the lowermost stage are connected to the anode external input / output terminal 132 and the cathode external input / output terminal 136, respectively,

The plane of the capacitor 110 is formed in various shapes such as a polygonal shape, a shape including a curved surface, and these examples are shown in the following drawings.

FIGS. 2 to 5 show plan views of stacks constituting the capacitor according to still another embodiment of the present invention.

Referring first to FIG. 2, the laminate 210 includes a first side outer circumferential surface 212 and a second side outer circumferential surface 214 which are formed into a flat shape in a straight line. The center point C of the curved surface shape of the second side outer circumferential surface 214 is formed into an arc shape toward the first side outer circumferential surface 212 so that the layered body 210 has a substantially semicircular shape in plan view .

A positive terminal 218 and a negative terminal 219 for connecting to the external input / output terminal protrude from the first side outer peripheral surface end portion 212.

Referring to FIG. 3, the laminate 310 has a structure in which a depressed portion 315 recessed inward is formed on one side 312 of the laminate body 310 in a plane. The depressions 315 may be formed in a rectangular shape on one side as shown in the figure, but may be formed on another side or may be formed in various shapes other than a rectangular shape. have.

4, one of the opposite side edges of one side 412, on which the electrode terminals 418 and 419 protrude, is formed in the shape of a curved surface 415 in a plan view. The curved surface 415 is formed in such a manner that the convex portions of the arcs are directed in the outer surface direction of the laminated body so as to form an asymmetrical structure with respect to the central axis A across the laminated body 410 .

Referring to FIG. 5, the layered body 510 has a substantially planar shape. The star-shaped laminate 510 is illustrative and shows that the planar shape of the laminate can be variously formed without being particularly limited.

6 is a schematic vertical sectional view of a capacitor according to another embodiment of the present invention.

6, a stack 610 of capacitors 600 includes a plurality of anodes 612a, 612b, 612c and a plurality of cathodes 616a, 616b, 616c, and a plurality of dielectrics 616a, 616b And 616c. One anode, one dielectric, and one cathode are stacked to form one unit, and the unit bodies are stacked to form a stack. The anode 112a located at the uppermost end and the cathode 116a located at the lowermost end are connected to the anode external input / output terminal 132 and cathode external input / output terminal 136, respectively, and protrude to the outside of the case 120.

Some of the stacked unit pieces are formed in a structure having a different plane size so that a step is formed on the outer surface of the stacked body. That is, the unit pieces 610a, 610b, and 610c having different widths (widths) in the stacking direction are stacked, and by the structure in which the widths of the unit pieces 610a, 610b, and 610c gradually decrease toward the stacking direction Thereby forming a stepped stepped structure.

The case 620 housing the laminate 610 has a structure in which a stepped step is formed corresponding to the outer shape of the laminate 610.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (18)

1. A capacitor comprising: a laminate having a structure in which a positive electrode, a negative electrode, and a dielectric interposed between the positive electrode and the negative electrode are laminated vertically, and a case for housing the laminate,
The uppermost electrode and the lowermost electrode of the laminate are electrodes having opposite polarities and are respectively connected to external input / output terminals of the capacitor;
Wherein the laminate is a polygonal shape in plan view or a shape in which at least one side is a curved shape. The capacitor according to claim 1, wherein the electrodes between the uppermost electrode and the lowermost electrode are not connected to external input / output terminals of the capacitor. The multilayer body according to claim 1, wherein the laminate has a cathode terminal and a cathode terminal protruding in a plane on the first outer circumferential surface for connection with the external input / output terminal, and a second outer circumferential surface opposed to the first outer circumferential surface Wherein the capacitor is formed in a curved shape. The capacitor according to claim 3, wherein the first outer circumferential surface has a straight shape. The capacitor according to claim 3, wherein the curved surface shape of the second side outer peripheral surface is an arc whose center point is directed toward the outer peripheral surface side of the first side. The capacitor according to claim 5, wherein the radius of the arc is 50 to 300% of the length of the first side outer circumferential surface. The capacitor according to claim 1, wherein at least one edge of the laminate is curved in plan view. The capacitor according to claim 1, wherein the laminate has an asymmetric structure with respect to a center axis crossing the laminate in a plane. 9. The capacitor of claim 8, wherein the asymmetric structure is formed as a curved portion. The capacitor according to claim 9, wherein the curved portion is formed of at least one arc, and the convex portion of the arc is formed to face the outer surface of the laminate. The capacitor according to claim 1, wherein the laminate has a depressed portion formed on one side of the laminate body in a planar manner and indented inside. The laminate according to claim 1, wherein the laminate includes at least two anodes, at least two cathodes, and at least two dielectrics, wherein one anode, one dielectric, and one cathode form one unit, And a planar size is different from each other such that a step is formed on the outer surface of the body. 13. The capacitor according to claim 12, wherein the case has a stepped step in correspondence with an outer shape of the laminate. 13. The capacitor according to claim 12, wherein the unit bodies have the same height. 13. The capacitor according to claim 12, wherein at least two unit pieces having different planar sizes have at least one of a width (width) and a width (length) different from each other. A secondary battery pack comprising a capacitor according to any one of claims 1 to 15 as an auxiliary power source. A device comprising a capacitor according to any one of claims 1 to 15. 18. The apparatus of claim 17, wherein the device is a notebook, a mobile phone, a camera, a toy, a PDP, a PMP, an MP3 player, a DSC (Digital Still Camera), a DVR, a smart phone, a camcorder, , An electric vehicle, a hybrid electric vehicle, or a power storage device.

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