KR20190053362A - An axial-type lithium ion capacitor comprising graphene electrode - Google Patents

Abstract

The present invention relates to an axial-type cylindrical lithium ion capacitor including a graphene electrode. According to the present invention, the cylindrical lithium ion capacitor comprises: a capacitor element in which an anode, a cathode, and a separator are cylindrically wound around a plastic bobbin disposed at the center in a state where the anode, the cathode, and the separator are stacked, and the anode is a graphene electrode including reduced graphene powder; an inner terminal plate which is in electrical contact with an upper portion of the capacitor element; a case which is formed in a tube shape with an opened one side, enables the capacitor element to be inserted through an opening for the inner terminal plate to face upward, such that a lower portion of the capacitor element is in contact with a bottom portion, and includes a case inner protrusion portion fastened with a central portion lower side of the capacitor element; an external terminal plate which is coupled to the opening side of the case to seal the case, is electrically connected to the inner terminal plate and has a terminal plate protrusion portion fastened with a central portion upper side of the capacitor element; and an elastic ring which is disposed between the inner terminal plate and the outer terminal plate to support the inner terminal plate and the outer terminal plate to maintain a constant clearance. According to the present invention, the manufacturing costs of the super capacitor can be reduced.

Description

An axial-type lithium ion capacitor comprising a graphene electrode and a graphene electrode,

The present invention relates to a super capacitor, and more particularly, to an axial type cylindrical lithium ion capacitor including a graphene electrode.

In addition to various portable electronic devices, there is a demand for electric power storage devices for electric vehicles and electric energy storage devices for systems for controlling or supplying instantaneous overload. Ni-MH Secondary batteries such as batteries, Ni-Cd batteries, lead acid batteries and lithium secondary batteries, and super capacitors, aluminum electrolytic capacitors, and ceramic capacitors having high output densities and close to unlimited charge / discharge life.

In particular, the super capacitor includes an electric double layer capacitor (EDLC), a pseudo capacitor, and a hybrid capacitor such as a lithium ion capacitor (LIC).

Here, the electric double layer capacitor is a capacitor using an electrostatic charge phenomenon occurring in an electric double layer formed at the interface of different phases, and has a faster charging / discharging speed, a higher charge / discharge efficiency than the battery in which the energy storage mechanism depends on the oxidation and reduction process, Is widely used for backup power supply, and the potential as an auxiliary power source for electric vehicles in the future is also unlimited.

A pseudocapacitor is a capacitor that converts a chemical reaction into electric energy by using an oxidation-reduction reaction of an electrode and an electrochemical oxide reactant. The pseudocapacitor has a storage capacity about 5 times larger than that of the electric double layer capacitor because the electric double layer capacitor can store the electric charge near the surface of the electrode material as compared with the electric double layer capacitor formed on the surface of the electrochemical double layer type electrode. As the metal oxide electrode material, RuOx, IrOx, MnOx and the like are used.

And the lithium ion capacitor is a new concept secondary battery system which combines the high output and long life characteristics of the existing electric double layer capacitors and the high energy density of the lithium ion battery. Electric double layer capacitors using the physical adsorption reaction of electric charges in the electric double layer have been limited in their application to various applications due to their low energy density despite excellent power characteristics and lifetime characteristics. As a means for solving the problem of such an electric double layer capacitor, a lithium ion capacitor using a carbon-based material capable of inserting and separating lithium ions as a negative electrode active material has been proposed. The lithium ion capacitor has a structure in which lithium ions, And the cell voltage can realize a high voltage of 3.8 V or more, which is much higher than that of the conventional electric double layer capacitor by 2.5 V, and can exhibit a high energy density.

When the charge mechanism of the lithium ion capacitor constituting the cathode using the lithium-ion-doped carbonaceous material is examined, electrons move from the cathode to the carbonaceous material and the carbonaceous material becomes negatively charged. Thus, In contrast, when discharging, the lithium ions inserted in the carbonaceous material are removed from the negative electrode, and anions are adsorbed to the positive electrode. By using such a mechanism, it is possible to realize a lithium ion capacitor having a high energy density by controlling the doping amount of lithium ions in the cathode.

This lithium ion capacitor is a system that combines the energy storage capacity of a lithium ion battery and the output characteristics of a capacitor. By applying a material capable of simultaneously exhibiting two functions, it exhibits capacitor characteristics when using high output power, It is a future battery system that extends to ion battery level.

Korean Patent No. 10-1690795 (registered on December 22, 2016)

Accordingly, an object of the present invention is to provide an axial type cylindrical lithium ion capacitor including a graphene electrode.

An object of the present invention is to provide an axial-type cylindrical lithium ion capacitor including a graphene electrode having a structurally more stable structure and being easy to manufacture.

In order to achieve the above object, the present invention provides a positive electrode, a negative electrode, and a separator, wherein the positive electrode, the negative electrode, and the separator are stacked in a cylindrical shape around a plastic bobbin disposed at the center, An in-capacitor element; An inner terminal plate in electrical contact with an upper portion of the capacitor element; A case inner protruding portion which is disposed in a tubular shape with one side open and in which the capacitor element is inserted through the opening with the inner terminal plate facing upward so that the lower portion of the capacitor element is in contact with the bottom portion and is fastened to the lower side of the center portion of the capacitor element An enclosing case; An external terminal board coupled to an opening side of the case to seal the case and electrically connected to the internal terminal board and having a terminal plate protrusion to be fastened on a central portion of the capacitor element; And an elastic ring disposed between the inner terminal plate and the outer terminal plate to support the inner terminal plate and the outer terminal plate so as to maintain a constant clearance. The graphene electrode according to claim 1, Thereby providing a capacitor.

The active material of the positive electrode may include a reduced graphene powder, a conductive carbon, and a binder.

The composition ratio of the reduced graphene powder, the conductive carbon, and the binder may be 90: 5: 5.

Wherein the inner terminal plate comprises: a circular plate portion having a predetermined thickness and diameter; A through hole formed at the center of the circular plate member so as to penetrate the terminal plate projection of the external terminal plate; And at least one plate member having a predetermined width and a length which are connected to at least one side of the front surface of the circular plate member and are bent in a predetermined height from the front surface.

The super capacitor according to the present invention may further include a coupling structure that penetrates the plate member and connects the plate member to a screw groove formed in the external terminal board.

The elastic ring may be seated in a ring groove formed in the inner terminal plate and the outer terminal plate facing each other.

The case includes a bottom portion; The case inner protrusion protruding inward from the center of the bottom portion; A case outer protrusion protruding outward from the center; And a cylindrical pillar having a predetermined thickness at the edge of the bottom and in which the capacitor element is received.

Wherein the external terminal board comprises: a first disc portion having a first diameter similar to the bottom portion and having a predetermined thickness; A second circular plate portion formed on the first circular plate portion and having a second diameter smaller than the first diameter; And a terminal portion having the same center as the second disk portion and protruding by a predetermined height.

The cylindrical lithium ion capacitor of the axial type according to the present invention may further include a sealed insulating ring disposed at a step formed between the first disk portion and the second disk portion.

The case may further include a curling portion formed by curling the upper end of the tubular post and sealing the case in contact with the sealed insulating ring.

The cylindrical lithium ion capacitor of the axial type according to the present invention may further include an insulator insulating the upper end of the cylindrical column portion and the external terminal board.

In addition, the capacitor element may be formed by winding the positive electrode and the negative electrode after being laminated with a predetermined thickness.

Since the cylindrical lithium ion capacitor of the axial type according to the present invention uses a graphene electrode as the anode and the graphene electrode includes the reduced graphene powder, the manufacturing cost of the capacitor can be lowered, and the excellent Electrochemical properties.

The cylindrical lithium ion capacitor of the axial type according to the present invention can be manufactured more easily and stably and thus can easily support the supply of an axial type cylindrical lithium ion capacitor.

In addition, even if an impact occurs during use of the cylindrical lithium ion capacitor of the axial type, since the elastic ring interposed between the inner terminal plate and the outer terminal plate provided in the capacitor element absorbs impact and alleviates the shock, It is possible to prevent the resistance characteristic due to the clearance from being lowered.

FIG. 1 is a block diagram schematically showing an appearance of an axial type cylindrical lithium ion capacitor according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view showing an axial-type cylindrical lithium ion capacitor of Fig. 1; Fig.
3 is a view showing an example of a case according to an embodiment of the present invention.
4 is a view showing another example of a case according to an embodiment of the present invention.
5 is a more detailed view of a capacitor device according to an embodiment of the present invention.
6 is a perspective view of the external terminal board according to the embodiment of the present invention in an upward direction.
7 is a bottom perspective view for explaining an external terminal board according to an embodiment of the present invention in more detail.
8 is a view for explaining a first embodiment of an internal terminal board according to an embodiment of the present invention.
9 is a view for explaining a second embodiment of the internal terminal board according to the embodiment of the present invention.
10 is a perspective view in an upper direction for explaining a first embodiment of the inner terminal board and the outer terminal board according to the embodiment of the present invention.
11 is a perspective view in a downward direction for explaining the first embodiment of the inner terminal board and the outer terminal board according to the embodiment of the present invention.
12 is a perspective view in an upward direction for explaining a second embodiment of the inner terminal board and the outer terminal board according to the embodiment of the present invention.
13 is a perspective view in a downward direction for explaining a second embodiment of the inner terminal board and the outer terminal board according to the embodiment of the present invention.
FIG. 14 is a flowchart illustrating a method of manufacturing an axial type cylindrical lithium ion capacitor according to an embodiment of the present invention.

In the following description, only parts necessary for understanding embodiments of the present invention will be described, and descriptions of other parts will be omitted to the extent that they do not disturb the gist of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and the inventor is not limited to the meaning of the terms in order to describe his invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention, so that various equivalents And variations are possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing an appearance of an axial type cylindrical lithium ion capacitor 10 including a graphene electrode according to an embodiment of the present invention.

1, an axial-type cylindrical lithium ion capacitor 10 according to the present embodiment includes an outer terminal plate 100 disposed at an upper portion thereof, an outer terminal plate 100 surrounding the outer terminal plate 100, and an electric double layer capacitor And a case 200 having a capacitor element provided therein and a protruded protrusion having a predetermined height on the inside and outside.

The cylindrical lithium ion capacitor 10 of the above-described configuration has a structure in which an electric double layer capacitor is provided in a winding form to constitute a capacitor element, and the capacitor element is electrically connected to the inner bottom surface of the case 200, (200) and the outer bottom surface of the case (200) forms one electrode terminal. And a capacitor element in which an electrolyte is injected is disposed in the case 200, an inner terminal plate is placed on a capacitor element, and an outer terminal board 100 is coupled to an upper portion of the inner terminal board. As a result, the cylindrical lithium ion capacitor 10 of the axial type of the present invention has a case in which a capacitor element impregnated with an electrolyte is inserted into the case 200, and a case outer protrusion 220 protruding outward from the bottom of the case 200 And the external terminal board 100 may be fixed to the open region of the case 200 while being connected to the capacitor element through the internal terminal board. Accordingly, the cylindrical lithium ion capacitor 10 of the axial type according to the present embodiment can be manufactured through a simpler manufacturing process, and the built-in elements are firmly sealed using the external terminal board 100 and the case 200 It helps to maintain a solid structure. The internal structure of the cylindrical lithium ion capacitor 10 of the above-mentioned axial type will be described in more detail with reference to FIG.

2 is a view for explaining an internal structure of an axial type cylindrical lithium ion capacitor 10 according to an embodiment of the present invention.

2, an axial-type cylindrical lithium ion capacitor 10 according to the present embodiment includes a case 200, a capacitor element 300, an inner terminal plate 400, and an outer terminal plate 100 from the lower side Lt; / RTI > The cylindrical lithium ion capacitor 10 of the axial type has an elastic ring 500 disposed between the inner terminal plate 400 and the outer terminal plate 100 and a coupling ring connecting the inner terminal plate 400 and the outer terminal plate 100 An insulator 700 for insulating the external terminal board 100 and the case 200 from each other while the outer terminal board 100 and the curling portion 201 And sealing the inside of the case 200. The sealing insulating ring 800 may be formed of a material having a high thermal conductivity.

As shown in the figure, the cylindrical lithium ion capacitor 10 of the present invention has a case inner protrusion 210 provided inside the center of the case 200 to fix a lower central portion of the plastic bobbin 310, The terminal plate protrusion 110 protruding from the center of the terminal plate 100 to the inside of the case 200 fixes the central portion of the upper side of the plastic bobbin 310 of the capacitor element 300. [ The capacitor element 300 can be more firmly fixed between the external terminal board 100 and the case 200 when the edge of the external terminal board 100 and the opening end of the case 200 are coupled by a curling operation. In this process, the case 200 may function as an electrode terminal while contacting the lower portion of the capacitor element 300, and in particular, the case outer protrusion 220 may serve as a protruded electrode terminal.

The inner terminal plate 400 is bonded to the upper end of the capacitor element 300 and the inner terminal plate 400 and the outer terminal plate 100 are bonded to each other in order to more firmly contact the capacitor element 300 and the external terminal plate 100, The external terminal board 100 and the capacitor element 300 can be more firmly connected by using the coupling structure 600. In particular, conductive plate materials having elasticity may be provided on the inner terminal plate 400 and connected to the outer terminal plate 100. As a result, as the external terminal board 100 is coupled to the case 200, the plates provide elasticity in a predetermined direction, thereby assuring that the connection between the external terminal board 100 and the case 200 can be more firmly maintained. In this process, the elastic ring 500 is provided between the inner terminal plate 400 and the outer terminal plate 100 to prevent the deterioration of resistance characteristics that may occur due to a clearance change between the inner terminal plate 400 and the outer terminal plate 100 .

The cylindrical lithium ion capacitor 10 of the axial type according to the present embodiment having the structure described above can prevent the external terminal board 100 and the internal terminal board 400 from being damaged even if the internal terminal board 400 is disposed in contact with the upper end of the capacitor element 300 The inner terminal plate 400 is held in intimate contact with the upper end of the capacitor element 300 by the elasticity of the plate member disposed between the inner terminal plate 400 and the inner terminal plate 400. Thus, the cylindrical lithium ion capacitor 10 of an axial type can be manufactured .

The lower end of the capacitor element 300 is arranged to be in contact with the inside of the bottom of the case 200 and then the opening of the case 200 is curled at the edge of the external terminal board 100 to press the plates between the internal terminal boards 400 The lower portion of the capacitor element 300 can be maintained in close contact with the bottom portion of the case 200. [ The case 200 is connected to the capacitor element 300 and functions as an electrode terminal so that the sealed insulating ring 800 and the insulator 700 are disposed between the case 200 and the external terminal board 100, And the external terminal board 100 are insulated from each other.

In particular, the insulator 700 may be provided to cover the upper edge of the capacitor element 300 and the edge of the external terminal board 100, so that the edges of the inner terminal wall and the external terminal board 100 of the case 200 may not contact each other. The sealing insulating ring 800 contacts the end of the curling portion 201 to prevent the curling portion 201 from contacting the external terminal board 100 during the upper curling process of the case 200, Type cylindrical lithium ion capacitor 10 seal. The hermetic insulating ring 800 may be formed of an elastic material, and may be formed of rubber, synthetic rubber, or the like to seal the inside of the case 200.

2, the curling portion 201 is formed only on the left side. However, in order to explain the formation of the curling portion 201, in the course of completion of the manufacturing operation after the external terminal board 100 is disposed, And may be provided in a curled shape in which the terminals are all curled and brought into contact with the sealing insulating ring 800 formed on the rim of the external terminal board 100.

3 is a view for explaining an example of the case 200 of the cylindrical lithium ion capacitor 10 of the axial type according to the present embodiment in more detail. In particular, the drawings show a cylindrical case 200 cut.

3, the case 200 of the present invention includes a circular or elliptical bottom 230, a case inner protrusion 210 protruding inward from the center of the bottom 230, A case outer protrusion 220 protruding from the center to the outside, and a first cylindrical post 241 extending vertically from the case bottom 230.

Here, the case inner protrusion 210 has a constant diameter at the center of the bottom portion 230 and is elongated. The diameter of the inner protrusion 210 gradually decreases from a predetermined height. The end of the case inner protrusion 210 may be rounded. The case inner side projection 210 having such a structure may be provided in a funnel shape whose diameter decreases toward the upper side. An end of the case inner protrusion 210 may be inserted and fixed to the center of the plastic bobbin 310 formed at the center of the capacitor element 300. Meanwhile, the case outer protrusion 220 has a constant diameter at the center of the case 200 and can be extended by a predetermined height.

The first cylindrical post 241 has a certain thickness at the edge of the bottom 230 and is stretched. The height of the first cylindrical column portion 241 is greater than the height of the capacitor element 300, the thickness of the inner terminal plate 400, the height of the plate members placed on the inner terminal plate 400, . The nodule 250 may be formed at a predetermined height of the first cylindrical post 241. The nod 250 may be bent inwardly from the outer wall of the first cylindrical post 241 by a predetermined depth. The nodal portion 250 may be provided between the capacitor element 300 and the boundary of the external terminal board 100. The nodal portion 250 can serve as a reference point for the arrangement of the external terminal board 100. A certain height of the end of the first cylindrical columnar portion 241 is bent toward the center of the case 200 by the curling process. At this time, the outer terminal plate 100, which is placed on the upper side, (Not shown).

Meanwhile, the structure of the case 200 of the present invention may be provided in another form as shown in FIG. Referring to FIG. 4, the case 200 of the present invention may include a bottom 230, a case inner protrusion 210, a case outer protrusion 220, and a second cylindrical post 242. Here, the bottom 230, the case inner protrusion 210, and the case outer protrusion 220 may have the same configuration as that described in FIG.

The second cylindrical portion 242 includes a first extending portion 41 having a predetermined thickness from the edge of the bottom portion 230 and extending vertically by a predetermined height and a second extending portion extending from the first extending portion 41 to the first extending portion 41 And a second stretching part 42 having a thickness smaller than the thickness of the second stretching part 42. The second tubular post 242 may be formed such that the outer wall is uniformly formed, while the inner wall of the second tubular post 242 is formed by the first stretchable portion 41 and the second stretchable portion 42 in a stepped shape. The step boundary between the first stretching part 41 and the second stretching part 42 may have the same function as the nodal part 250 described above with reference to FIG.

5 is a perspective view showing the capacitor element 300 applied to the cylindrical lithium ion capacitor 10 of the axial type according to the present embodiment in more detail.

Referring to FIG. 5, the capacitor device 300 according to the present embodiment includes an anode 340, a cathode 350, a separator 330, and an electrolytic solution. The capacitor device 300 according to the present embodiment is configured such that the anode 340, the cathode 350, and the separator 330 are stacked in a cylindrical form around the plastic bobbin 310 disposed at the center .

The anode 340 generates electrons by an oxidation reaction. The cathode 350 absorbs the generated electrons and a reduction reaction occurs. The separation membrane 330 is interposed between the cathode 350 and the anode 340 to physically separate the cathode 350 and the anode 340 to separate the oxidation reaction and the reduction reaction from each other. The electrolytic solution is a transfer medium of ions that stores electrical energy in the anode 340 and the cathode 350.

The anode 340 according to this embodiment uses a graphene electrode containing a reduced-graphene oxide (rGO) powder as an active material.

That is, the anode 340 has a structure in which a cathode active material layer is formed on both surfaces of a flexible cathode plate. At this time, a thin film of an aluminum material can be used as a cathode plate. The positive electrode active material layer contains reduced graphene powder. For example, the cathode active material may include reduced graphene powder, conductive carbon, and a binder, and the composition ratio of the reduced graphene powder, the conductive carbon, and the binder may be 90: 5: 5. As the conductive carbon, activated carbon or graphite may be used.

The cathode 350 has a structure in which an anode active material layer is formed on both sides of a flexible anode plate. At this time, a thin film of an aluminum material can be used as an anode plate. The negative electrode active material layer contains reduced graphene powder. For example, the negative electrode active material includes a conductive carbon and a binder. As the conductive carbon, activated carbon or graphite may be used.

In addition, the capacitor element 300 may include a first cover 360 covering the wound cylindrical top by a predetermined height, and a second cover 370 covering the bottom of the capacitor by a predetermined height. Wherein the first lid 360 is in contact with the anode 340 of at least one point of the wound cylindrical capacitor element 300 and the second lid 370 is in contact with the wound cylindrical capacitor element The cathode 350 of at least one point of the cathode 350, e.g. In this process, the contact between the anode 340 and the cathode 350 may be formed by laser welding or the like. As a result, the first cover 360 serves as a positive electrode lead of the capacitor element 300, and the second cover 370 serves as a negative electrode lead of the capacitor element 300. Or may act as an opposite polarity lead depending on the designer's design scheme or the arrangement of the capacitor elements 300. [

The cylindrical capacitor element 300 is wound around the cylindrical capacitor element 300 so that the upper end of the anode 340 protrudes upward from the cathode 350 and the lower end of the cathode 350 protrudes below the anode 340 at a predetermined interval It may be a plate material structure which is laminated in a twisted form. The first lid 360 formed on the wound cylindrical capacitor element 300 can be more easily contacted or welded to the anode 340 and the second lid 370 can be easily contacted or welded to the cathode 350, To be welded or welded.

6 and 7 are views showing the external terminal board 100 applied to the cylindrical lithium ion capacitor 10 of the axial type according to the present embodiment in more detail.

6 and 7, the outer terminal plate 100 of the present invention includes a first circular plate 120 having a first diameter and a predetermined thickness, a second circular plate 120 having a smaller second diameter than the first circular plate 120, A first circular plate part 130 formed on the first circular plate part 120 and a terminal part 140 formed on the second circular plate part 130 and a second circular plate part 130 formed on the first circular plate part 120, And a terminal plate protrusion 110 protruding in a direction opposite to the direction in which the terminal block 140 is disposed.

The first disk 120 may have a first diameter and a shape similar to the diameter of the bottom 230 of the case 200, for example, a disk or an elliptical plate. The first disk 120 may be formed in a polygonal shape corresponding to the bottom 230 when the bottom 230 of the case 200 is formed of a polygon such as a square or a triangle. The first disk portion 120 is formed to have a predetermined thickness and a sealing insulating ring 800 is disposed at the upper edge. Here, the sealed insulating ring 800 has a strip shape having a predetermined thickness, and the surface placed on the first circular plate 120 and the opposite surface can be formed flat. A ring groove 150, in which the elastic ring 500 can be disposed, may be provided on a rear surface of the first disk 120 at a position spaced apart from the center by a predetermined distance.

The second circular plate part 130 having the same center as the first circular plate part 120 and having a second diameter smaller than the first circular plate part 120 has a step difference from the first circular plate part 120 . The above-mentioned hermetic insulating ring 800 may be placed in this step. The thickness of the second disk portion 130 may be similar to the thickness of the first disk portion 120.

The terminal portion 140 has a first terminal portion 141 and a first terminal portion 141 having a thickness similar to the center of the second disk portion 130 and smaller than the second diameter of the second disk portion 130, And a second terminal part 142 having the same center as the first terminal part 141 and having a predetermined height above the first terminal part 141. Here, the first terminal portion 141 may serve as an electrode terminal. The second terminal portion 142 may have a predetermined height.

The terminal plate protruding portion 110 provided at the center of the back surface of the first original plate 120 has a receiving portion 111 formed to have the same diameter and height as the center of the first original plate 120, A cone 112 of a shape gradually decreasing in diameter from the portion of the cone 112, and a stem 113 formed on the tip of the cone 112. A part of the stem 113 and the cone 112 are in contact with the plastic bobbin 310 provided at the center of the capacitor element 300 to fix the capacitor element 300. Here, a groove may be formed in the center of the plastic bobbin 310, and the groove may be provided in a form having a plurality of surfaces, for example, a square surface or a hexagonal surface. Accordingly, the stem 113 may also be provided in a shape corresponding to the shape of the groove having a plurality of surfaces, for example, a square column or a hexagonal column.

At least one screw groove 160 may be formed on one side of the back surface of the first disk 120. The screw groove 160 is configured to be engaged with the coupling structure 600. The screw groove 160 may be in contact with a plate member formed on the inner terminal plate 400 to electrically connect the inner terminal plate 400 and the outer terminal plate 100.

In the external terminal board 100 of the present invention, the terminal board protrusions 110, other discs, and the terminal unit 140 may be integrally formed. Accordingly, the present invention can simplify manufacture of the external terminal board 100 and support mass production.

8 is a view showing a first embodiment of an internal terminal plate 400 applied to an axial type cylindrical lithium ion capacitor 10 according to an embodiment of the present invention.

Referring to FIG. 8, a first embodiment of the inner terminal plate 400 of the present invention includes a circular plate member 410 having a predetermined thickness, at least one plate member 420 disposed at a predetermined interval on the circular plate member 410, Lt; / RTI >

The circular plate member 410 may have a predetermined thickness and a diameter and may have a diameter smaller than the diameter of the first circular plate 120 or the second circular plate 130 of the external terminal plate 100. The center of the circular plate member 410 may be provided with a through hole 430. The through hole 430 exposes the center of the capacitor element 300 and is an area where the terminal plate protrusion 110 of the external terminal plate 100 is inserted. For this purpose, the through-hole 430 may have a diameter that allows the terminal plate protrusion 110 to be inserted while exposing the center of the capacitor element 300.

Penetrating portions 450 penetrating the front and rear surfaces of the circular plate member 410 may be provided on at least one portion of the circular plate member 410 other than the central portion thereof. The penetrating portions 450 may be formed symmetrically with respect to the through hole 430. The weight of the internal terminal board 400 can be reduced through the arrangement of the penetrating portions 450. In addition, plate members grooves 440 may be formed in the rim of the circular plate member 410 at least at one or more openings to the outside. In the drawing, four plate material grooves 440 are provided as an example. The sheet material grooves 440 may be formed in a semicircular or " C " shape.

The plate members 420 may have a predetermined width and a predetermined length and may be provided in the form of a band connecting both side portions of the open plate member groove 440. The plate members 420 may be made of a material having elasticity when bent and contact with the external terminal plate 100 And may be formed of a conductive material. Accordingly, when four plate grooves 440 are provided, four plate materials 420 may be provided corresponding to the plate grooves 440. Or the plate grooves 440 may be provided in two places. The plate members 420 include a fixing portion 421 fixed to one side of the blade side portions forming the opening of the plate member groove 440 and a fixing portion 421 fixed to the circular plate portion 410 in a state of being bent by a predetermined slope from the fixing portion 421. [ And a connecting portion 423 disposed in a direction parallel to the fixing portion 421 at the end of the bending portion 422. [ Accordingly, the connection portion 423 is disposed at a position spaced apart from the circular plate portion 410 by a predetermined height, and the arrangement position of the connection portion 423 may be disposed in parallel with the position where the plate member groove 440 is disposed. The connection portion 423 can be coupled to one side of the external terminal board 100 by the coupling structure 600. The connection portion 423 may be in contact with the screw groove 160 formed in the external terminal board 100 through the coupling structure 600. [ For this purpose, a hole through which the coupling structure 600 can pass may be formed at the center of the coupling part 423.

Meanwhile, the internal terminal board 400 of the present invention may be configured in the second form shown in FIG.

9, a second embodiment of the inner terminal plate 400 according to the present invention includes a circular plate member 410 having a predetermined thickness and a plurality of circular plate members 410 having a predetermined spacing on the circular plate member 410, And at least one plate 420 disposed in a direction from the center to the outside. Here, the circular plate member 410 may be provided in the same shape as the shape described above with reference to FIG. 8, a through hole 430 is formed at the center of the circular plate member 410 as described above with reference to FIG. 8, and a plurality of through holes 450 may be formed in a peripheral region where the through hole 430 is formed. The circular plate member 410 may be provided with a plate member groove 440 formed by removing a part of the edge.

The plate members 420 according to the second embodiment of the present invention include a fixing portion 421 fixed to the central region of both side portions of the wing forming the open region of the plate member groove 440 among the adjacent regions forming the plate member groove 440, A bending portion 422 spaced apart from the fixing portion 421 at a predetermined inclination in the upward direction of the circular plate portion 410 and a connecting portion 423 formed in a direction parallel to the fixing portion 421 at the end of the bending portion 422. [ ). Here, the connection portion 423 is coupled to the screw groove 160 formed in the external terminal board 100 through the coupling structure 600. The plate members 420 may protrude further from the center of the inner terminal plate 400 than the plate members 420 described above with reference to FIG. The angle of the bent portion 422 or the length of the bent portion 422 and the length of the connecting portion 423 can be adjusted. Meanwhile, the fixing portion 421 may be fixed to the inner terminal plate 400 by welding or may be bonded by a conductive adhesive. The components formed on the inner terminal plate 400, that is, the circular plate portion 410 and the plate members 420 may be formed of an electrically conductive material. Hereinafter, the combination of the external terminal board 100 and the internal terminal board 400 will be described in detail with reference to the drawings.

Figs. 10 and 11 are views for explaining a first embodiment of the present invention in which the inner terminal board 400 and the outer terminal board 100 are coupled.

10 and 11, the terminal plate protrusion 110 formed on the outer terminal plate 100 of the present invention is inserted into the through hole 430 formed in the center of the circular plate portion 410 of the inner terminal plate 400 . At this time, an elastic ring 500 may be disposed between the inner terminal plate 400 and the outer terminal plate 100 to support the inner terminal plate 400 and the outer terminal plate 100 at a predetermined distance or more. A part of the elastic ring 500 may be seated in a ring groove 150 formed on a back surface of the first circular plate portion 120 of the external terminal board 100.

Meanwhile, the connection portions 423 of the plate member 420 formed on the inner terminal plate 400 may have holes formed at the center thereof, and a part of the coupling structure 600, for example, a screw may penetrate the center hole 401 of the connection portion 423 And then inserted and fixed in the screw groove 160 formed in the external terminal board 100. The coupling structure 600 may be coupled to the hole 401 and the screw groove 160 formed at the center of the coupling portion 423 through the plate member groove 440 formed in the inner terminal plate 400. [

As shown in the figure, the inner terminal board 400 may be provided with a triangular-shaped concave-convex portion 402 as shown in FIG. The concavoconvex portion 402 is electrically connected to the first cover 360 of the capacitor element 300. The protrusions 402 protrude from the inner terminal plate 400 by a predetermined height so that the inner terminal plate 400 supports the first cover 360 more accurately. The concave and convex portions 402 may be formed in the direction of the plate material grooves 440 in the outward direction in the through holes 430 formed in the center of the inner terminal plate 400, As shown in Fig.

12 and 13 are views for explaining a combination of the inner terminal board 400 and the outer terminal board 100 according to a second embodiment of the present invention.

12 and 13, when the elastic ring 500 is disposed between the inner terminal plate 400 and the outer terminal plate 100, the plate members 420 formed on the inner terminal plate 400 of the second type are formed as shown in FIG. 10 The coupling structure 600 penetrates the hole formed at the center of the connection portion 423 and is coupled to the screw groove 160 formed on the back surface of the external terminal board 100 as shown in FIG. Here, the screw groove 160 may be formed to be different from the screw groove 160 corresponding to the internal terminal plate 400 of the first embodiment described above. The external terminal board 100 can be fastened to the plastic bobbin 310 formed at the center of the capacitor element 300 through the through hole 430 formed at the center of the internal terminal board 400.

Fig. 14 is a flowchart for explaining a method of manufacturing an axial-type cylindrical lithium ion capacitor according to the present invention.

Referring to FIG. 14, a method of manufacturing an axial-type cylindrical lithium ion capacitor according to the present invention comprises the steps of: (a) preparing a capacitor element in which an electric double layer capacitor is formed in a winding- (S103). The external terminal board having the terminal board protrusion is electrically connected to the internal terminal board. The terminal board protrusion is passed through the through hole formed in the center of the internal terminal board (S105) of tightening the upper part of the plastic bobbin (310) provided at the center of the capacitor element, curling the upper end of the case to form a curling portion, insulate from the outer terminal plate and curl in the edge direction of the outer terminal plate A case for sealing the case to the external terminal board [S107].

In addition, the method of manufacturing an axial-type cylindrical lithium ion capacitor 10 of the present invention may further include disposing an elastic ring having elasticity between the external terminal board and the internal terminal board. The method may further include the step of disposing a hermetically sealed insulation ring in an edge region of the external terminal board and a step of disposing an insulator between the inside of the case upper end portion and the external terminal board before the curling step of the case upper end portion . Meanwhile, the outer wall of the case 200 according to the present invention may be coated with an insulating material according to the designer's intention. In this case, only the region of the case outer protrusion 220 may be excluded.

It should be noted that the embodiments disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: Axial type cylindrical lithium ion capacitor
100: External terminal board
200: Case
300: capacitor element
400: internal terminal board
500; Elastic ring
600: Coupling structure
700: Insulator
800: Sealed insulation ring

Claims (12)

A positive electrode, a negative electrode, and a separator are stacked in a cylindrical shape around a plastic bobbin disposed at the center, and the positive electrode is a graphene electrode including a reducing graphene powder as an active material;
An inner terminal plate in electrical contact with an upper portion of the capacitor element;
A case inner protruding portion which is disposed in a tubular shape with one side open and in which the capacitor element is inserted through the opening with the inner terminal plate facing upward so that the lower portion of the capacitor element is in contact with the bottom portion and is fastened to the lower side of the center portion of the capacitor element An enclosing case;
An external terminal board coupled to an opening side of the case to seal the case and electrically connected to the internal terminal board and having a terminal plate protrusion to be fastened on a central portion of the capacitor element; And
An elastic ring disposed between the inner terminal plate and the outer terminal plate to support the inner terminal plate and the outer terminal plate to maintain a constant clearance;
And a second electrode connected to the first electrode and the second electrode. The method according to claim 1,
The active material of the positive electrode,
Wherein the graphene electrode comprises a reduced graphene powder, a conductive carbon, and a binder. 3. The method of claim 2,
Wherein the composition ratio of the reduced graphene powder, the conductive carbon, and the binder is 90: 5: 5. The method according to claim 1,
The inner terminal plate
A circular plate member having a predetermined thickness and diameter;
A through hole formed at the center of the circular plate member so as to penetrate the terminal plate projection of the external terminal plate; And
At least one plate member having a predetermined width and a length which are connected to at least one side of the front side of the circular plate member and are bent in a predetermined height from the front side;
And a graphene electrode disposed on the cylindrical lithium ion capacitor. 5. The method of claim 4,
An engaging structure that penetrates the plate member and connects the plate member to a screw groove formed in the external terminal board;
Further comprising a graphene electrode. The cylindrical lithium ion capacitor of claim 1, The method according to claim 1,
The elastic ring
Wherein the graphen electrode is mounted on a ring groove formed in the inner terminal plate and the outer terminal plate facing each other. The method according to claim 1,
The case
Bottom;
The case inner protrusion protruding inward from the center of the bottom portion;
A case outer protrusion protruding outward from the center; And
A tubular column portion having a predetermined thickness at an edge of the bottom portion and accommodating the capacitor element;
And a graphene electrode disposed on the cylindrical lithium ion capacitor. 8. The method of claim 7,
The external terminal board
A first circular plate portion having a first diameter similar to the bottom portion and having a predetermined thickness;
A second circular plate portion formed on the first circular plate portion and having a second diameter smaller than the first diameter; And
A terminal portion having the same center as the second original plate portion and protruding by a predetermined height;
And a graphene electrode disposed on the cylindrical lithium ion capacitor. 9. The method of claim 8,
A sealing insulating ring disposed at a step formed between the first disk portion and the second disk portion;
Further comprising a graphene electrode. The cylindrical lithium ion capacitor of claim 1, 10. The method of claim 9,
The case
A curling portion formed by curling an upper end of the tubular post and sealing the case in contact with the closed insulating ring;
Further comprising a graphene electrode. The cylindrical lithium ion capacitor of claim 1, 10. The method of claim 9,
An insulator which insulates an upper end of the cylindrical column portion from the external terminal board;
Further comprising a graphene electrode. The cylindrical lithium ion capacitor of claim 1, The method according to claim 1,
The capacitor element
Wherein the positive electrode and the negative electrode are laminated and wound on a predetermined thickness, respectively, and then wound to form a cylindrical lithium ion capacitor including a graphene electrode.

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