KR101999736B1 - An axial-type lithium ion capacitor comprising graphene electrode - Google Patents

Abstract

The present invention relates to an axial type cylindrical lithium ion capacitor comprising a graphene electrode. The cylindrical lithium ion capacitor according to the present invention is wound around a cylindrical bobbin disposed in the center in a state where the anode, the cathode, and the separator are stacked, respectively, and the anode is a capacitor element which is a graphene electrode including a reduced graphene powder. Internal terminal plate in electrical contact with the upper part of the capacitor element, a tubular shape of which one side is opened, the internal terminal plate is inserted upward through the opening and the capacitor element is inserted so that the lower part of the capacitor element is placed in contact with the bottom part and the lower part of the center of the capacitor element A case including a case inner protrusion coupled to the case, the case being coupled to the opening of the case to seal the case, an external terminal plate electrically connected to the inner terminal plate, and having a terminal plate protrusion formed on an upper side of the central portion of the capacitor element, and an inner terminal plate and the outside. Internal terminals disposed between the terminal plates It includes an elastic ring to support the plate and the outer terminal plate to maintain a constant play.

Description

Axial type lithium ion capacitor comprising 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.

Electric vehicles such as various portable electronic devices require electric energy storage devices for systems that require a power supply device, or systems for regulating or supplying an overload occurring instantaneously. Such electric energy storage devices include Ni-MH. Secondary batteries such as batteries, Ni-Cd batteries, lead acid batteries, and lithium secondary batteries, and supercapacitors, aluminum electrolytic capacitors, and ceramic capacitors having high output densities and almost unlimited charge / discharge lifetimes are included.

In particular, the supercapacitor 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 the electrostatic charge phenomenon generated in the electric double layer formed at the interface of the different phases, and has a faster charge / discharge rate, higher charge / discharge efficiency, and cycle characteristics than a battery whose energy storage mechanism relies on oxidation and reduction processes. This superiority is widely used for backup power, and the potential as an auxiliary power source for electric vehicles in the future is infinite.

A pseudo capacitor is a capacitor that converts and stores a chemical reaction into electrical energy by using an oxidation-reduction reaction of an electrode and an electrochemical oxide reactant. The pseudocapacitor can store charge up to near the surface of the electrode material as compared to the double layer formed on the surface of the electrochemical double layer electrode, so that the storage capacity is about five times larger than that of the double layer capacitor. RuOx, IrOx, MnOx and the like are used as the metal oxide electrode materials.

The lithium ion capacitor is a new concept of a secondary battery system that combines the high power and long life characteristics of a conventional electric double layer capacitor with the high energy density of a lithium ion battery. The electric double layer capacitor using the physical adsorption reaction of the electric charge in the electric double layer is limited to various applications due to the low energy density despite the excellent output characteristics and lifetime characteristics. As a means of solving the problems of the electric double layer capacitor, a lithium ion capacitor using a carbon-based material capable of inserting and desorbing lithium ions as a negative electrode active material has been proposed, and the lithium ion capacitor is previously doped with lithium ions having a high tendency to ionize the cathode. Thus, the potential of the cathode can be significantly lowered, and the cell voltage can be realized at a high voltage of 3.8 V or more, which is significantly improved compared to the 2.5 V of the conventional electric double layer capacitor, and can express high energy density.

Looking at the reaction mechanism of the lithium ion capacitor that constitutes the negative electrode using a lithium-based doped carbon-based material, electrons move from the negative electrode to the carbon-based material during charging, so that the carbon-based material has a negative charge, so that lithium ion is the carbon of the negative electrode. On the contrary, during discharge, lithium ions inserted into the carbon-based material are detached from the cathode, and negative ions are adsorbed on the cathode. By using such a mechanism, a lithium ion capacitor having a high energy density can be realized by controlling the doping amount of lithium ions at the cathode.

This lithium ion capacitor is a system that combines the energy storage capacity of a lithium ion battery with the output characteristics of a capacitor. It applies a material that can express both functions at the same time. It is a future battery system expanded to the level of ion battery.

Korea Patent Registration No. 10-1690795 (registered Dec. 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 having a more structurally stable structure, including a graphene electrode is easy to manufacture.

In order to achieve the above object, the present invention is wound around a cylindrical bobbin disposed in the center in a state in which the positive electrode, the negative electrode and the separator are laminated, respectively, the positive electrode is a graphene electrode comprising a reduced graphene powder as an active material Phosphor capacitor elements; An internal terminal plate in electrical contact with an upper portion of the capacitor element; A tubular shape having an opening on one side thereof, wherein the capacitor element is inserted through the opening so that the inner terminal plate faces upward, and a case inner protrusion is disposed while the lower portion of the capacitor element is in contact with the bottom and is fastened below the central portion of the capacitor element. A case comprising; An external terminal plate coupled to an opening of the case to seal the case, the external terminal plate electrically connected to the internal terminal plate, and having a terminal plate protrusion formed on an upper side of 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 predetermined clearance. The cylindrical lithium ion of the axial type including a graphene electrode, comprising: Provide a capacitor.

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

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

The inner terminal plate, the circular plate portion having a predetermined thickness and diameter; A through hole formed at a center of the circular plate member to penetrate the terminal plate protrusion of the external terminal plate; And at least one plate having a predetermined width and length connected to at least one of the one side of the front surface of the circular plate portion, the shape being bent from the front surface by a predetermined height.

The supercapacitor according to the present invention may further include a coupling structure penetrating the plate to connect the plate to a screw groove formed in the external terminal plate.

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

The case, the bottom portion; The case inner protrusion protruding inward from the bottom center; A case outer protrusion protruding outward from the center; And a cylindrical pillar having a predetermined thickness at the bottom edge and accommodating the capacitor device.

The external terminal plate may include a first disc portion having a first diameter similar to the bottom portion and formed to a predetermined thickness; A second disc portion formed on the first disc portion and having a second diameter smaller than the first diameter; And a terminal portion protruding by a predetermined height and having the same center as the second disc portion.

An axial cylindrical lithium ion capacitor according to the present invention may further include a sealing insulation ring disposed at a step formed between the first disc portion and the second disc portion.

The case may further include a curry portion formed by being cured by the upper end of the cylindrical pillar portion and in contact with the sealing insulation ring to seal the case.

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

In addition, the capacitor device may be formed by winding the anode and the cathode after being twisted and stacked to have a predetermined thickness, respectively.

Since the axial cylindrical lithium ion capacitor according to the present invention uses a graphene electrode as an anode, and the graphene electrode includes a reduced graphene powder, it is possible to reduce the manufacturing cost of the capacitor and to increase the capacitance. Electrochemical properties.

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

In addition, even when an impact occurs during use of the axial cylindrical lithium ion capacitor, the elastic ring interposed between the inner terminal plate and the outer terminal plate installed in the capacitor element absorbs the shock and mitigates the shock. It is possible to prevent the resistance characteristic from being deteriorated.

1 is a block diagram schematically showing an exterior of an axial type cylindrical lithium ion capacitor according to an exemplary embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating a 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 view showing in detail a capacitor device according to an embodiment of the present invention.
6 is a perspective view of an external terminal plate according to an exemplary embodiment of the present invention in an upward direction for explaining in more detail.
7 is a perspective view from below in order to describe the external terminal board according to an exemplary embodiment of the present disclosure in more detail.
8 is a diagram for describing a first form of an internal terminal plate according to an exemplary embodiment of the present disclosure.
9 is a view for explaining a second form of the internal terminal plate according to an embodiment of the present invention.
FIG. 10 is a perspective view from an upper direction for explaining a combination of an inner terminal plate and an outer terminal plate of a first form according to an exemplary embodiment of the present invention. FIG.
FIG. 11 is a perspective view from below in order to illustrate coupling between an inner terminal plate and an outer terminal plate of a first form according to an exemplary embodiment of the present disclosure; FIG.
FIG. 12 is a perspective view from an upper direction for explaining a combination of an inner terminal plate and an outer terminal plate of a second form according to an exemplary embodiment of the present invention. FIG.
FIG. 13 is a perspective view in a lower direction for explaining a combination of an inner terminal plate and an outer terminal plate of a second form according to an embodiment of the present invention; FIG.
14 is a flowchart illustrating a method of manufacturing an axial cylindrical cylindrical lithium ion capacitor according to an exemplary embodiment of the present invention.

In the following description, only parts necessary for understanding the embodiments of the present invention will be described, it should be noted that the description of other parts will be omitted in a range that does not distract from the gist of the present invention.

The terms or words used in the specification and claims described below should not be construed as being limited to the ordinary or dictionary meanings, and the inventors are appropriate to the concept of terms in order to explain their invention in the best way. It should be interpreted as meanings and concepts in accordance with the technical spirit of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only preferred embodiments of the present invention, and do not represent all of the technical idea of the present invention, and various equivalents may be substituted for them at the time of the present application. It should be understood that there may be variations and variations.

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

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

Referring to FIG. 1, an axial type cylindrical lithium ion capacitor 10 according to the present embodiment surrounds an outer terminal plate 100 and an outer terminal plate 100 disposed at an upper portion thereof, and an electric double layer capacitor is wound therein. The capacitor device is provided as is disposed and comprises a case 200 having a predetermined height in and out and formed with a protruding protrusion.

In the axial type cylindrical lithium ion capacitor 10 having such a configuration, an electric double layer capacitor is formed in a winding type to configure a capacitor element, and the capacitor element is electrically connected to the inner bottom surface of the case 200 by the case. The outer bottom surface of the case 200 is seated inside the 200 and has a structure of forming one electrode terminal. The capacitor device into which the electrolyte is injected may be disposed in the case 200, the internal terminal plate may be disposed on the capacitor device, and the external terminal plate 100 may be coupled to the upper terminal plate. As a result, the axial type cylindrical lithium ion capacitor 10 of the present invention has one case outer protrusion 220 protruding outward from the bottom of the case 200 while the capacitor element impregnated with the electrolyte is inserted into the case 200. It serves as an electrode terminal, it may be provided in the form that the external terminal plate 100 is connected to the capacitor element through the inner terminal plate is seated and fixed in the open area of the case 200. Accordingly, the axial type cylindrical lithium ion capacitor 10 according to the present embodiment can be manufactured through a simpler manufacturing process, but by tightly encapsulating the built-in elements using the external terminal plate 100 and the case 200. It helps to maintain a solid structure. The internal structure of the above-described axial type cylindrical lithium ion capacitor 10 will be described in more detail with reference to FIG. 2.

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

2, the 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 bottom side. Can be configured. And the axial cylindrical lithium ion capacitor 10 is coupled to connect the elastic ring 500 disposed between the inner terminal plate 400 and the outer terminal plate 100, the inner terminal plate 400 and the outer terminal plate 100. Insulator 700 to insulate between the structure 600, the external terminal plate 100, and the case 200, and the cutting portion 201 of the external terminal plate 100 and the case 200 in a process of opening the opening of the case 200. It may include a sealing insulating ring 800 to perform the insulation between the and to seal the inside of the case 200.

As shown in the axial type cylindrical lithium ion capacitor 10 of the present invention, the inner case protrusion 210 provided inside the center of the case 200 fixes the lower center of the plastic bobbin 310 and the outside. The terminal plate protrusion 110 protruding from the center of the terminal plate 100 to the case 200 is fixed to the upper center portion of the plastic bobbin 310 of the capacitor element 300. Accordingly, when the edge of the external terminal plate 100 and the end of the opening of the case 200 are coupled by a curling operation, the capacitor device 300 may be more firmly fixed between the external terminal plate 100 and the case 200. In this process, the case 200 may serve 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 protruding electrode terminal.

In the above-described structure, the internal terminal plate 400 is adhered to the upper end of the capacitor element 300 for more firm contact between the capacitor element 300 and the external terminal plate 100, and the internal terminal plate 400 and the external terminal plate 100 are bonded to each other. By using the coupling structure 600 to connect, the external terminal plate 100 and the capacitor device 300 may be more firmly fastened. In particular, conductive plates 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 plate 100 is coupled with the case 200, the plate members provide elasticity in a predetermined direction to support the coupling of the external terminal plate 100 and the case 200 to be more firmly maintained. In this process, by providing the elastic ring 500 between the inner terminal plate 400 and the outer terminal plate 100 to prevent the deterioration of the resistance characteristics that may occur due to the gap between the inner terminal plate 400 and the outer terminal plate 100. Can be.

In the axial type cylindrical lithium ion capacitor 10 according to this embodiment of the above-described structure, even if the inner terminal plate 400 is disposed in contact with the upper end of the capacitor element 300, the outer terminal plate 100 and the inner terminal plate 400 By maintaining the inner terminal plate 400 in close contact with the upper end of the capacitor element 300 by the elasticity of the plate disposed between the axial cylindrical cylindrical lithium ion capacitor 10 without performing a separate welding process. To help.

In addition, the lower end of the capacitor 300 is placed in contact with the inner bottom of the case 200, and supports the pressing of the plates between the inner terminal plate 400 while the opening of the case 200 to the edge of the outer terminal plate 100. As a result, the lower part of the capacitor element 300 may also maintain intimate contact with the bottom of the case 200. Meanwhile, since the case 200 is connected to the capacitor element 300 to serve as an electrode terminal, the sealing insulation ring 800 and the insulator 700 are disposed between the case 200 and the external terminal plate 100, thereby providing the case 200. ) And the external terminal plate 100.

In particular, the insulator 700 may have a shape surrounding the top edge of the capacitor element 300 and the edge of the external terminal plate 100 to support the inner wall of the case 200 and the edge of the external terminal plate 100 in contact with each other. The sealing insulation ring 800 is in contact with the end of the curry portion 201 such that the curry portion 201 does not contact the external terminal plate 100 during the upper portion of the case 200. Earl type cylindrical lithium ion capacitor 10 supports sealing. The hermetic insulating ring 800 may be formed of an elastic material, and may be formed of rubber or synthetic rubber to seal the inside of the case 200.

In FIG. 2, the curry portion 201 is formed only on the left side, but this is for explaining the formation of the curry portion 201 and the upper end portion of the case 200 in the process of manufacturing is completed after the external terminal plate 100 is disposed. All are cured and may be provided in a curling shape in contact with the hermetic insulating ring 800 formed at the edge of the external terminal plate 100.

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

Referring to FIG. 3, the case 200 of the present invention includes a circular or oval bottom portion 230, a case inner protrusion 210 protruding inwardly from the center of the bottom portion 230, and a bottom portion 230. The case outer protrusion 220 protruding from the center to the outside, and the first cylindrical pillar portion 241 extending vertically from the case bottom portion 230.

Here, the case inner protrusion 210 is elongated with a predetermined diameter at the center of the bottom 230 and is elongated in a form of gradually decreasing in diameter from a certain height, and is elongated again with a constant diameter from a certain height. And the end of the case inner protrusion 210 may be rounded. Case inner protrusion 210 of such a structure may be provided in a funnel shape is reduced in diameter toward the upper side. An end of the case inner protrusion 210 may be inserted and fixed at the center of the plastic bobbin 310 formed at the center of the capacitor element 300. Meanwhile, the case outer protrusion 220 may have a predetermined diameter at the center of the case 200 and extend by a predetermined height.

The first cylindrical pillar portion 241 extends with a predetermined thickness at the edge of the bottom portion 230. The height of the first cylindrical columnar portion 241 is greater than the height of the capacitor element 300 and the thickness of the inner terminal plate 400 and the thickness of the outer terminal plate 100 under the height of the plates placed on the inner terminal plate 400. Can be. A node 250 may be formed at a predetermined height of the first cylindrical pillar part 241. The node 250 may be provided in a form bent in a predetermined depth from the outer wall of the first cylindrical columnar portion 241. The node 250 may be provided between the capacitor element 300 and the boundary of the external terminal plate 100. The node 250 may serve as a reference point for the arrangement of the external terminal plate 100. The predetermined height of the ends of the first cylindrical pillar 241 is bent in the direction of the center of the case 200 by the curing process, and at this time, the outer terminal plate 100 and the hermetic insulation ring placed on the edge of the outer terminal plate 100 Cured on 800.

Meanwhile, the case 200 structure of the present invention may be provided in another form as shown in FIG. 4. Referring to FIG. 4, the case 200 of the present invention may include a bottom portion 230, a case inner protrusion 210, a case outer protrusion 220, and a second cylindrical pillar 242. Here, the bottom 230, the case inner protrusion 210, and the case outer protrusion 220 may have the same configuration as described with reference to FIG. 3.

The second cylindrical columnar portion 242 has a first thickness portion 41 extending from the edge of the bottom portion 230 vertically by a predetermined height, and the first extension portion 41 from the first extension portion 41. It is configured to include a second stretched portion 42 having a thickness thinner than the thickness of). The second cylindrical columnar portion 242 has an outer wall uniformly formed, while the inner wall may be formed in a stepped shape of the first extension portion 41 and the second extension portion 42. The step boundary between the first extension part 41 and the second extension part 42 may play the same role as the node part 250 described above with reference to FIG. 3.

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

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 electrolyte. The capacitor device 300 according to the present exemplary embodiment has a shape in which the anode 340, the cathode 350, and the separator 330 are wound in a cylindrical shape with respect to the plastic bobbin 310 disposed at the center thereof in a stacked state. Can be.

The anode 340 generates electrons by an oxidation reaction. The cathode 350 absorbs the generated electrons to cause a reduction reaction. The separator 330 is interposed between the negative electrode 350 and the positive electrode 340 to physically separate the negative electrode 350 and the positive electrode 340 to isolate a place where an oxidation reaction and a reduction reaction occur and distinguish from each other. The electrolyte is a moving medium of ions for storing electrical energy in the anode 340 and the cathode 350.

The positive electrode 340 according to the present embodiment uses a graphene electrode including reduced graphene oxide (rGO) powder as an active material.

That is, the positive electrode 340 has a structure in which a positive electrode active material layer is formed on both sides of a flexible positive plate. In this case, a thin film of aluminum material may be used as the positive electrode plate. The positive electrode active material layer includes reduced graphene powder. For example, the positive electrode active material may include reduced graphene powder, conductive carbon, and a binder, and a composition ratio of the reduced graphene powder, conductive carbon, and a binder may be 90: 5: 5. Activated carbon or graphite may be used as the conductive carbon.

The negative electrode 350 has a structure in which a negative electrode active material layer is formed on both sides of a flexible negative electrode plate. In this case, a thin film of aluminum material may be used as the negative electrode plate. The negative electrode active material layer includes reduced graphene powder. For example, the negative electrode active material includes conductive carbon and a binder. Activated carbon or graphite may be used as the conductive carbon.

In addition, the capacitor device 300 may include a first cover 360 covering the wound cylindrical top by a predetermined height and a second cover 370 covering the bottom by a predetermined height. Here, the first cover 360 is in contact with an anode 340, for example, the upper part of the anode 340, at at least one point of the wound cylindrical capacitor device 300, and the second cover 370 is a wound cylindrical capacitor device ( At least one point of the cathode 350 is in contact with, for example, the upper portion of the cathode 350. 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 may serve as the anode lead of the capacitor device 300, and the second cover 370 may serve as the cathode lead of the capacitor device 300. Alternatively, the polarizer may serve as a reverse polarity lead according to the design method of the designer or the arrangement of the capacitor device 300.

Meanwhile, the wound cylindrical capacitor elements 300 may be spaced apart from each other so that the upper end of the anode 340 may protrude upward from the cathode 350 and the lower end of the cathode 350 may protrude downward from the anode 340. It may also be a plate structure laminated in a twisted form. Accordingly, the first cover 360 formed on the wound cylindrical capacitor element 300 may be more easily contacted or welded with the positive electrode 340, and the second cover 370 may be easier with the negative electrode 350. Can be contacted or welded.

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

6 and 7, the external terminal plate 100 of the present invention has a first diameter and a predetermined thickness and a second diameter and a constant smaller than that of the first disc portion 120. A second disc portion 130 formed on the first disc portion 120, a terminal portion 140 formed on the second disc portion 130, and a terminal portion at the center of the first disc portion 120. It may be formed including a terminal plate protrusion 110 protruding in a direction opposite to the direction in which the 140 is disposed.

The first disc part 120 may be formed in a first diameter and shape similar to the diameter of the bottom portion 230 of the case 200, for example, a disc shape or an elliptic plate shape. When the bottom portion 230 of the case 200 is formed of a polygon such as a rectangle or a triangle, the first disc portion 120 may also be formed in the shape of a polygon corresponding to the bottom portion 230. The first disc portion 120 is formed to have a predetermined thickness and the sealing insulation ring 800 is placed on the upper edge. Here, the sealing insulation ring 800 may have a strip shape having a predetermined thickness, and the surface and the opposing surface placed on the first disc portion 120 may be formed flat. A ring groove 150 in which the elastic ring 500 may be disposed may be provided at a rear surface of the first disc part 120 at a predetermined distance from the center.

The second disc part 130 having the same center as the first disc part 120 but having a second diameter smaller than the first diameter of the first disc part 120 has a step with the first disc part 120. Form. In this step, the aforementioned sealing insulation ring 800 may be placed. The thickness of the second disc portion 130 may have a thickness similar to the thickness of the first disc portion 120.

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

The terminal plate protruding portion 110 provided at the center of the rear surface of the first disc portion 120 has a base portion 111 and a end portion of the base portion 111 having a predetermined diameter and a height at the same center as the first disc portion 120. It may include a cone 112 having a shape gradually decreasing in diameter from the portion, the top portion 113 formed on the top of the cone 112. A portion of the stem 113 and the cone 112 is in contact with the plastic bobbin 310 provided in the center of the capacitor element 300 serves to fix the capacitor element 300. In this case, a groove may be formed in the center of the plastic bobbin 310, and the groove may be provided in a shape having a plurality of surfaces, for example, a square or 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 pillar or a hexagonal pillar.

At least one screw groove 160 may be provided at one side of the rear surface of the first disc part 120. The screw groove 160 is configured to be coupled to the coupling structure 600. The screw groove 160 may be in contact with the plate 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 plate 100 of the present invention described above, the terminal plate protruding portion 110 and the other disc portions and the terminal portion 140 may be integrally formed. Accordingly, the present invention can simplify the manufacture of the external terminal plate 100 and can support the mass production.

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

Referring to FIG. 8, the first form of the inner terminal plate 400 of the present invention includes a circular plate portion 410 having a predetermined thickness and at least one plate member 420 disposed at a predetermined interval on the circular plate portion 410. Can include them.

The circular plate member 410 may have a predetermined thickness and diameter, but may have a diameter smaller than the diameter of the first disc part 120 or the second disc part 130 of the external terminal plate 100. The through hole 430 may be provided at the center of the circular plate portion 410. The through hole 430 is for exposing the central portion of the capacitor element 300, and is a region into which the terminal plate protrusion 110 of the external terminal plate 100 is inserted. To this end, the size of the through hole 430 may be formed to have a diameter in which the terminal plate protrusion 110 may be inserted while exposing the center portion of the capacitor element 300.

Through portions 450 passing through the front and rear surfaces of the circular plate portion 410 may be provided at at least one portion outside the center of the circular plate portion 410. The through parts 450 may be provided in a symmetrical shape with respect to the through hole 430. The weight of the internal terminal plate 400 may be reduced by arranging the through parts 450. In addition, the edge of the circular plate portion 410 may be provided with plate grooves 440 open to the outside at least one or more places. In the drawings, the plate grooves 440 are provided in four places as an example. Plate groove 440 may be formed in a semi-circular or "C" shape.

The plate 420 may be provided in the form of a band connecting both sides of the open plate groove 440 having a predetermined width and length, and may be formed of a material having elasticity when bent, and contact with the external terminal plate 100. It may be formed of a conductive material for. Accordingly, when the plate grooves 440 are provided in four places, four plate plates 420 may be provided to correspond to the plate grooves 440. Alternatively, the plate groove 440 may be provided in two places. The plate 420 is a fixed portion 421 is fixed to one side of the both sides of the blade forming the opening of the plate groove 440, and the circular plate portion 410 in a state bent by a predetermined inclination from the fixing portion 421 The bent portion 422 spaced apart from the surface of the bent portion 422 may be configured to include a connecting portion 423 disposed in a direction parallel to the fixing portion 421. Accordingly, the connection part 423 may be disposed at a position spaced apart from the circular plate part 410 by a predetermined height, and in this case, an arrangement position of the connection part 423 may be arranged in parallel with a position where the plate groove 440 is disposed. The connection part 423 may be coupled to one side of the external terminal plate 100 by the coupling structure 600. In particular, the connection part 423 may be in contact with the screw groove 160 formed in the external terminal plate 100 through the coupling structure 600. To this end, a hole through which the coupling structure 600 may be formed may be formed in the center of the connection portion 423.

Meanwhile, the internal terminal plate 400 of the present invention may be configured in the second form shown in FIG. 9.

9, the second form of the inner terminal plate 400 of the present invention is disposed on the circular plate portion 410, the circular plate portion 410 of a predetermined thickness at regular intervals of the circular plate portion 410 It may include at least one plate member 420 disposed in the outward direction from the center. In this case, the circular plate member 410 may be provided in the same shape as the shape described with reference to FIG. 8. That is, as described above with reference to FIG. 8, the circular plate member 410 may have a through hole 430 formed therein, and a plurality of through portions 450 may be provided in a peripheral area where the through hole 430 is formed. In addition, the circular plate portion 410 may be provided with a plate groove 440 is formed by removing a portion of the edge.

On the other hand, the plate member 420 of the second aspect of the present invention is a fixing portion 421 fixed to the central region of both sides of the blade forming the open area of the plate groove 440 of the adjacent areas forming the plate groove 440 The bent portion 422 is spaced apart from the fixed portion 421 in the upward direction of the circular plate portion 410 and the connecting portion 423 formed in parallel with the fixed portion 421 at the end of the bent portion 422. ) May be included. Herein, the connection part 423 is coupled to the screw groove 160 formed on the external terminal plate 100 through the coupling structure 600. The plate 420 may be further protruded outward from the center of the inner terminal plate 400 as compared to the plate 420 described above with reference to FIG. 8. Accordingly, the position of the screw groove 160 formed in the external terminal plate 100 may be adjusted, or the angle of bending of the bending portion 422, the length of the bending portion 422, or the length of the connecting portion 423 may be adjusted. Meanwhile, the fixing part 421 described above may be fixed to the internal terminal plate 400 by welding or adhered by a conductive adhesive. Components formed on the inner terminal plate 400, that is, the circular plate member 410 and the plate member 420 may be formed of an electrically conductive material. A combination of the external terminal plate 100 and the internal terminal plate 400 described above will be described in more detail with reference to the accompanying drawings.

10 and 11 are views for explaining the coupling of the internal terminal plate 400 and the external terminal plate 100 of the first embodiment of the present invention.

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 at the center of the circular plate member 410 of the inner terminal plate 400. Can be arranged. In this case, 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 to maintain a predetermined interval or more. The elastic ring 500 may be partially mounted in the ring groove 150 formed on the rear surface of the first disc portion 120 of the external terminal plate 100.

On the other hand, the connection portion 423 of the plate 420 formed on the inner terminal plate 400 may be formed in the center, the coupling structure 600, for example, a part of the screw penetrates through the central hole 401 of the connection portion 423 After that, it may be inserted and fixed in the screw groove 160 formed in the external terminal plate 100. In this case, the coupling structure 600 may be coupled to the hole 401 and the screw groove 160 formed at the center of the connection portion 423 through the plate groove 440 formed on the inner terminal plate 400.

A triangular concave-convex portion 402 may be provided on the rear surface of the inner terminal plate 400. The uneven portion 402 is configured to be electrically connected to the first cover 360 of the capacitor element 300. Since the uneven portion 402 protrudes from the inner terminal plate 400 by a predetermined height, the inner terminal plate 400 supports the first cover 360 to be more accurately contacted. The concave-convex portion 402 may be formed in an outward direction, for example, in the direction of the plate groove 440 in the through hole 430 formed at the center of the inner terminal plate 400. It may be formed between).

12 and 13 are views for explaining the coupling between the internal terminal plate 400 and the external terminal plate 100 of the 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 previously described with reference to FIG. 10. 11, 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 rear surface of the external terminal plate 100, as described with reference to FIG. 11. The screw groove 160 may be formed to be different from the position of the screw groove 160 corresponding to the internal terminal plate 400 of the first type described above. The external terminal plate 100 may 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 plate 400.

14 is a flowchart illustrating a method of manufacturing an axial type cylindrical lithium ion capacitor of the present invention.

Referring to FIG. 14, in the method of manufacturing an axial cylindrical lithium ion capacitor according to the present invention, a method of manufacturing a capacitor device in which an electric double layer capacitor is formed in a winding type is provided [S101], and the lower part of the capacitor device, in particular, a plastic bobbin 310. Storing the capacitor element in the case while fastening the lower center of the lower portion to the inner protrusion of the case [S103], electrically connecting the outer terminal plate having the terminal plate protrusion with the inner terminal plate and passing through the through hole formed at the center of the inner terminal plate. Fastening to the upper side of the plastic bobbin 310 provided in the center of the capacitor element [S105], by curing the upper end of the case to form a curing portion, while maintaining the insulation with the external terminal plate and the curing in the direction of the edge of the external terminal plate A stage for sealing the case with the external terminal plate System [S107] may be included.

In addition, the method of manufacturing the axial type cylindrical lithium ion capacitor 10 of the present invention may further include disposing an elastic ring having a predetermined thickness and elasticity between the outer terminal plate and the inner terminal plate. And the method further comprises arranging a hermetic insulating ring in an edge region of the outer terminal plate and arranging an insulator between the inside of the case upper end and the outer terminal plate before the curing step of the upper end of the case. Can be. Meanwhile, the outer wall of the case 200 of the present invention may be coated with an insulating material according to a designer's intention, and in this case, only the outer surface of the case outer protrusion 220 may be excluded.

On the other hand, the embodiments disclosed in the specification and drawings are merely presented specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

10: axial type cylindrical lithium ion capacitor
100: external terminal plate
200: case
300: capacitor element
400: internal terminal plate
500; Elastic ring
600: coupling structure
700: insulator
800: sealed insulation ring

Claims (12)

A capacitor device which is wound around a cylindrical bobbin disposed at the center in a state in which a cathode, a cathode, and a separator are stacked, and the anode is a graphene electrode including reduced graphene powder as an active material;
An internal terminal plate in electrical contact with an upper portion of the capacitor element;
A tubular shape having an opening on one side thereof, wherein the capacitor element is inserted through the opening so that the inner terminal plate faces upward, and a case inner protrusion is disposed while the lower portion of the capacitor element is in contact with the bottom and is fastened below the central portion of the capacitor element. A case comprising;
An external terminal plate coupled to an opening of the case to seal the case, the external terminal plate electrically connected to the internal terminal plate, and having a terminal plate protrusion formed on an upper side of 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 at a predetermined clearance;
Including a graphene electrode, characterized in that including;
The active material of the positive electrode,
Including reduced graphene powder, conductive carbon, and a binder,
The composition ratio of the reduced graphene powder, the conductive carbon and the binder is 90: 5: 5,
On both sides of the positive electrode plate constituting the positive electrode is formed a positive electrode active material layer consisting of the reduced graphene powder,
On both sides of the negative electrode plate constituting the negative electrode is formed a negative electrode active material layer consisting of the reduced graphene powder,
The conductive carbon is an axial type cylindrical lithium ion capacitor formed of activated carbon or graphite. delete delete The method of claim 1,
The inner terminal plate
Circular plate member having a predetermined thickness and diameter;
A through hole formed at a center of the circular plate member to penetrate the terminal plate protrusion of the external terminal plate; And
At least one plate having a predetermined width and length connected to at least one of the one side of the circular plate portion and being bent from a front surface by a predetermined height;
Axial type cylindrical lithium ion capacitor comprising a graphene electrode comprising a. The method of claim 4, wherein
A coupling structure penetrating the plate to connect the plate to a screw groove formed in the external terminal plate;
Axial type cylindrical lithium ion capacitor comprising a graphene electrode further comprising a. The method of claim 1,
The elastic ring is
An axial type cylindrical lithium ion capacitor including a graphene electrode, characterized in that seated in the ring groove formed in the inner terminal plate and the outer terminal plate facing each other. The method of claim 1,
The case is
Bottom;
The case inner protrusion protruding inward from the bottom center;
A case outer protrusion protruding outward from the center; And
A cylindrical pillar portion having a predetermined thickness at the bottom edge and accommodating the capacitor element;
Axial type cylindrical lithium ion capacitor comprising a graphene electrode comprising a. The method of claim 7, wherein
The external terminal plate
A first disc portion having a first diameter similar to the bottom portion and formed to a predetermined thickness;
A second disc portion formed on the first disc portion and having a second diameter smaller than the first diameter; And
A terminal portion having the same center as the second disc portion and protruding by a predetermined height;
Axial type cylindrical lithium ion capacitor comprising a graphene electrode comprising a. The method of claim 8,
A sealing insulation ring disposed at a step formed between the first disc portion and the second disc portion;
Axial type cylindrical lithium ion capacitor comprising a graphene electrode further comprising a. The method of claim 9,
The case is
Curing portion formed by the upper end of the cylindrical pillar portion is cured in contact with the sealing insulating ring to seal the case;
An axial type cylindrical lithium ion capacitor comprising a graphene electrode further comprising a. The method of claim 9,
An insulator insulating between an upper end of the cylindrical pillar portion and the external terminal plate;
An axial type cylindrical lithium ion capacitor comprising a graphene electrode further comprising a. The method of claim 1,
The capacitor device
An axial type cylindrical lithium ion capacitor comprising a graphene electrode, characterized in that the positive electrode and the negative electrode are twisted and stacked to a predetermined thickness, respectively.

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