KR101537999B1

KR101537999B1 - Electric double layer device

Info

Publication number: KR101537999B1
Application number: KR1020130065482A
Authority: KR
Inventors: 김영진; 유기상; 이상석; 정관구
Original assignee: 주식회사 네스캡
Priority date: 2013-06-07
Filing date: 2013-06-07
Publication date: 2015-07-20
Also published as: KR20140143641A

Abstract

According to the technical feature of the present invention, the under connection plate 31 is composed of the under connection plate 31a and the under connection side 31b, and the under connection plate 31a is formed on the first current collector 11 of the winding unit 10. [ And the under connection side 31b is bent downward from the rim of the under connection plate 31a so as to be brought into close contact with the inner periphery of the case 20. In this state, The lower end of the lower connecting side face 31b, the lower end of the under connecting side face 31b and the edge of the under-terminal plate 32 are sealed by laser welding in one piece, thereby achieving quick fix (productivity improvement) To an electric double layer device capable of achieving a strong bonding (improved coupling) and maximizing sealing.

Description

ELECTRIC DOUBLE LAYER DEVICE

The present invention relates to an electric double layer device, and more particularly, to an electric double layer device capable of ensuring productivity, stability and airtightness.

2. Description of the Related Art Generally, an electric double layer device is an element that stores electrical energy such as a battery, a capacitor, or an electrolytic capacitor. The electric double layer device electrically charges and discharges electricity by using an electrically conductive electrode. , MP3 players or memory backups, or for driving motors in wind, solar, electric cars or hybrid cars.

Generally, an electric double layer refers to a state in which a positive charge is formed on one side of a thin film layer of an object and a negative charge is continuously or uniformly distributed on the other side of the object. The electric double layer is mainly composed of an electric dipole Refers to a bilayer, and usually at the boundary of different materials, charge rearrangement occurs and an electrical double layer is formed.

At the interface between the solid-state electrode and the liquid electrolyte solution, either selective adsorption of a cation or anion in the solution, dissociation of solid surface molecules, or array adsorption to the interface of the dipole, It is also a cause of formation. This is called the Helmholtz layer.

Such an electric double layer is closely related to various interfacial electrochemical phenomena such as electrode reaction, interfacial electrophoresis (interfacial electrophoresis, interfacial electrophoresis), and colloid stability.

An example of an electric double layer device is a capacitor.

The electric double layer capacitor functions to accumulate electricity like a battery by forming an electrostatic layer on the interface between the activated carbon electrode and the organic electrolyte and using the electric double layer state as a function of the dielectric.

Particularly, the charge accumulated in the electric double layer generated between the solid electrode and the solid or liquid electrolyte is used.

Capacitors have low energy density compared to batteries, but exhibit excellent characteristics in terms of power density indicating instantaneous high power output, and have been applied to various fields due to their semi-permanent lifetime exceeding several hundred thousand times.

As a principle of the electric double layer capacitor, when a pair of solid electrodes are put in an electrolyte solution of an electrolyte and a DC voltage is applied, anion is positively induced in the electrode polarized by the anode, and positive ions are induced in the electrode polarized in the cathode, . Particularly, in the case of activated carbon, numerous pores are distributed and the electric double layer is formed naturally. The stored charge can be calculated by the following equation (1).

[Equation 1]

(∈ ₀ , air permittivity, ε, electrolyte permittivity, σ, electrolyte ion radius, S, electrode specific surface area)

As shown in Equation 1, the larger the specific surface area of the electrode, the larger the dielectric constant of the electrolyte, and the smaller the radius of the ion in the formation of the double layer, the greater the capacity can be obtained . In addition, the capacitance is determined by the internal resistance of the electrode, the pore distribution of the electrode and the relationship or the withstand voltage between the electrolyte ions.

At this time, the structure of the electric double layer capacitor is composed of an electrode, a separator, an electrolyte, a current collector and a case.

Among these, the most important part of the capacitor is the selection of the material used for the electrode, but the capacitance is also changed by various other components.

The electrode material must have high electrical conductivity, high specific surface area, and electrochemical stability.

Next, a battery is an example of the electric double layer device.

A battery is a device that converts the chemical energy of a chemical substance (active material) contained therein into an electrical energy through an electrochemical oxidation-reduction reaction (redox reaction).

A cell represents a collection of two or more electrochemical cells, but is usually used for a single cell. Such a cell is made such that an electrochemical reaction takes place instead of a chemical reaction so that electrons can flow to the outside through a lead. Electrons flowing through the lead provide an electrical usefulness as a source of electrical energy.

More specifically, the cell has active materials such as a cathode or a positive electrode and an anode or a negative electrode, which are placed on the current collector, are separated from each other by a separator, and an electrolyte (electrolyte).

In order to operate lamps, machines and appliances, proper electrode materials and electrolytes should be selected and arranged in a special structure so that sufficient voltage and current can be generated between the two electrodes of the battery.

For example, a cathode that receives electrons from an external conductor and that reduces the cathode active material, a cathode that discharges electrons to the conductor as the anode active material oxidizes, and an oxidation reaction of the anode and a cathode, A separator for preventing physical contact between the anode and the cathode, and the like must be arranged so as to be able to provide chemical energy as electrical energy.

The negative electrode of the battery arranged in this way basically emits electrons and oxidizes itself. When the positive electrode receives electrons (together with positive ions) and the battery itself is operated to be connected to an external load, the two electrodes are electrochemically They make changes and do electrical work.

At this time, the electrons generated by the oxidation reaction of the cathode migrate to the anode via the external load, reach the anode and cause a reduction reaction with the cathode material, and anion (negative ion) and cation ion) to complete the charge flow.

Inside the electrolyte, the reaction proceeds so that the charge continues to flow through the outer conductor, and by doing so, the electrical work is carried out on the charge.

A battery can be classified into a liquid electrolyte cell and a polymer electrolyte cell depending on the kind of electrolyte. Generally, a battery using a liquid electrolyte is called a lithium ion battery, and a lithium polymer battery when a polymer electrolyte is used.

FIG. 1 is a schematic view showing the structure of a general electric double layer device, FIG. 2 is a schematic view for explaining the charging principle of an electric double layer capacitor applied to a general electric double layer device, and FIG. 3 is a schematic view showing an electric double layer capacitor And FIG.

A general electric double layer device 100 includes an electrode 10, an electrolyte 20, a current collector 30, a separator 40, a first lead terminal 61 and a second lead terminal 62 ).

At this time, when the electric double layer device 100 is compared with a battery, the chemical energy of the chemical material (active material) contained therein will be converted into electric energy through an electrochemical oxidation-reduction reaction, The electrode 10 covered on the entire body 30 has an active material such as a positive electrode and a negative electrode.

On the other hand, when the electric double layer device 100 is compared with a capacitor, its characteristics will be described in more detail. By using a distribution in which positive and negative charges are arranged in a short distance in the interface between two different electrodes 10, And exhibits a high capacitive characteristic in the farad unit, and has a characteristic that performance change and deterioration due to charging and discharging cycles are extremely small.

The electrode 10 stores the charge by the electric double layer formed at the interface with the electrolyte 20 using activated carbon having a large specific surface area and the electrode 10 has a capacitance ) And internal resistance characteristics are the most important criteria for performance evaluation. Therefore, the material should have low resistivity and be a porous structure, and the pore size and distribution of the porous structure should be simple and balanced. The characteristics of the material of the electrode 10 dominate the intrinsic charge and discharge characteristics of the electric double layer capacitor.

Therefore, active carbon sub-system having a large specific surface area and low cost is widely used as the current electrode 10, and studies using metal oxides and conductive polymers have been increasing to increase energy density.

On the other hand, the electrolyte 20 uses an organic solvent, a quaternary ammonium salt (organic), and an aqueous sulfuric acid solution (aqueous solution). Electrical conductivity can be improved by mixing certain proportions of PC, ethylmethyl carbonate (EMC), PC and dimethoxyethane (DME) in organic solvent electrolytes.

The electrostatic capacity per unit area of the electric double layer capacitor 100 using the organic electrolytic solution is 4 to 6 kV / cm 2, and since the electric conductivity of the aqueous system is higher than that of the organic electrolytic solution, But it has disadvantages such as narrowing of potential window and decomposition.

As the separator 40, nonwoven fabric, porous polyethylene (PE), polypropylene (PP) film or the like is used.

The charging principle of the electric double layer capacitor is explained with reference to the charging principle of the electric double layer capacitor of FIG. 2 in a state where the two electrodes 10 and the electrolyte 20 are opposed to each other with the separator 40 interposed therebetween as shown in FIG. The electric charge distribution inside the bulk state becomes non-uniform and the electric potential difference between the electrodes 10 becomes zero, and the charge / discharge principle of the electric double layer capacitor of Fig. 3 When electric energy is supplied from the outside as shown in the circuit diagram for explanation, the internal charge distribution is uniformly formed and the energy of the potential difference _{2? 1} voltage is charged between the two electrodes 10 as shown in Fig.

At this time, even if the supply of the electric energy is interrupted, the already formed electric double layer does not disappear, and the charged electric energy is maintained and preserved.

Prior Art Document (10-2008-0044054; Modular Electric Double-Layer Capacitor and Method for Manufacturing the Same) FIG. 4 is a process diagram illustrating a manufacturing process of an electric double layer capacitor according to the prior art document, FIG. 5 is a diagram illustrating a method of manufacturing an integrated electric double layer capacitor according to the prior art document, and FIG. FIG. 2 is a view illustrating a manufacturing process of an electrode device in an electric double layer capacitor according to an embodiment of the present invention. 2. Description of the Related Art Generally, energy storage devices such as rechargeable / rechargeable secondary batteries such as an electrolytic capacitor and an electric double layer capacitor (EDLC) are widely used as a jelly roll type winding-type battery. 4, a retractable energy storage device, such as an EDLC (Electrochemical Double Layer Capacitor), is mainly composed of a cylindrical case 20 made of aluminum (Al), a case 20 (Not shown). The winding element 10 has a structure in which a band-shaped electrode laminate, that is, an electrode element of positive and negative electrodes, and a belt-like electrode laminate composed of an electrolytic sheet interposed between the electrode elements of the positive and negative electrodes, Winding, and then taping the outside so that the winding shape is not loosened. The terminal 30 is provided on the upper portion of the winding element 10 and the terminal plate 30 is provided with a lug. Or an external terminal 40 of a screw type is fastened. A neck portion 21 for preventing the terminal plate 30 from being pushed downward is formed at an upper portion of the case 20 so that the winding element 10 is formed in such a manner that the neck portion 21 is formed in the case 20 And the winding element 10 and the external terminal 40 are electrically connected to each other by the terminal 23. The terminal board 30 is fixed in the case 20 through a curing process in which the upper end 22 of the case 20 is bent. 6, the electrode element 100 includes an electrode current collecting sheet 111 such as a conventional aluminum foil and an electrode active material coated on the current collecting sheet 111 112). The electrode active material 112 is formed by applying a conductive paste mainly composed of activated carbon. The terminal 120 is coupled to the electrode element 100. At this time, the electrode active material 112 is removed by scraping a portion to which the terminal 120 is to be coupled first, and then the electrode active material 112 is removed by a process such as rivetting, 120 are coupled to each other. The Applicant of the present application will further propose an improved electric double layer device having the above-described characteristics to the present invention.

An object of the present invention is to provide an electric welding machine which can achieve not only simple fixing (productivity improvement) but also quick welding (improvement of workability) and solid bonding (improvement of coupling) Layer device.

It is an object of the present invention to provide an electric double layer device capable of reducing the weight and material cost as well as stability by providing a safety vent groove on the under terminal plate.

An object of the present invention is to provide an electric double layer device capable of maximizing airtightness and ensuring productivity and workability by simple assembly.

An object of the present invention is to provide an electric double layer device capable of maximizing a sealing force.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric double layer device capable of preventing the tearing phenomenon of the curling rubber beforehand and maximizing the sealing effect by expanding the pressing area of the curling rubber.

According to an aspect of the present invention,

A winding unit including a first current collector and a second current collector which are wound while being separated by a separator; a case for accommodating the winding unit; and a base member connected to the first current collector of the winding unit, And a cap which is assembled on the upper portion of the case and connected to the second current collector of the winding unit,

The base

An under connection plate having an under connection plate connected to a first current collector of the winding unit and an under connection side bent downward from a rim of the under connection plate to closely contact an inner periphery of the case; And an under terminal plate which is supported on the lower side and contacts the inner circumference of the under connection side,

And the lower end of the case, the lower end of the under-connection side surface, and the edge of the under-terminal plate are integrally laser welded to be sealed.

The present invention is not limited to simple fixing (improvement of productivity), but also by quick welding (improvement of workability) and solid connection by welding all parts together, by integrally laser welding the lower end of the case, the lower end of the under connection side, (Bonding property) can be obtained, and the sealing can be maximized.

The present invention is advantageous in that it is possible to reduce the material cost and further reduce the weight while securing the safety by providing the safety vent grooves in place of the case where the thickness of the under terminal plate is relatively small compared with the case width .

The upper connecting plate and the upper terminal plate are more widely bent on the upper surface of the upper connecting plate, the lower surface of the upper terminal rim, the upper connecting surface and the upper terminal rim of the upper connecting plate, The curing rubber can be sealed while being pressurized by the part, thereby maximizing the airtightness and assuring productivity by simple assembly.

The present invention has the effect of maximizing the sealing force by allowing the curling rubber to bend to a larger surface area and to seal at the same time by having the inclined portion in addition to the vertical portion and the horizontal portion.

The present invention has an effect of preventing a phenomenon that the upper portion of the winding unit can be brought into contact with each other when the upper portion of the winding unit is close to the beading portion.

In the present invention, after a base is coupled to a lower part of a case, a winding unit is assembled in a case, and then an upper part of the case is coupled with a cap, an electrolyte through a vacuum is filled through a center hole. It is possible to weld and finally seal it.

The present invention has the effect of preventing the tearing phenomenon of the curling rubber beforehand and maximizing the sealing effect by widening the pressing area of the curling rubber.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing the structure of a general electric double layer element. FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric double layer capacitor, and more particularly,
3 is a circuit diagram for explaining the charging / discharging principle of an electric double layer capacitor applied to a general electric double layer device.
4 is a process diagram showing a manufacturing process of an electric double layer capacitor according to the prior art document.
5 is a view for explaining a method of manufacturing an integrated electric double layer capacitor according to the prior art document.
6 is a view for explaining a manufacturing process of an electrode element constituting an electric double layer capacitor according to the prior art document.
7A is a perspective view of an electric double layer device according to the present invention viewed from above;
7B is a perspective view of the electric double layer device according to the present invention as viewed from below.
8 is an exploded perspective view showing an electric double layer element according to the present invention.
9 is a sectional view showing an electric double layer element according to the present invention.
10A is a plan view showing a winding unit applied to an electric double layer element according to the present invention.
10B is a half sectional view showing a winding unit applied to the electric double layer element according to the present invention.
FIG. 10C is a developed view of the main part showing a winding unit applied to the electric double layer element according to the present invention. FIG.
11 is a cross-sectional view showing the bottom of the case applied to the electric double layer element according to the present invention, the lower end of the under connection side of the under terminal plate and the edge of the under terminal plate.
12A is a plan view showing an under connection plate applied to an electric double layer element according to the present invention.
12B is a cross-sectional view showing an under connection plate applied to an electric double layer element;
13A is a plan view showing an under terminal plate applied to an electric double layer element according to the present invention.
13B is a cross-sectional view showing an under-terminal plate applied to an electric double-layer element.
FIG. 14 is a cross-sectional view of a main portion showing a case and a cap applied to the electric double layer element according to the present invention. FIG.
FIG. 15A is a plan view showing an upper connection plate constituting a cap applied to an electric double layer element according to the present invention; FIG.
Fig. 15B is a cross-sectional view showing an upper connecting plate constituting a cap applied to the electric double layer element according to the present invention. Fig.
16 is a cross-sectional view showing an upper terminal plate which is a constitution of a cap applied to an electric double layer element according to the present invention.
17 is a sectional view showing a curling rubber constituting a cap applied to an electric double layer element according to the present invention.
18 is a cross-sectional view showing an upper terminal plate, a rubber plug, and an aluminum plug, which constitute a cap applied to the electric double layer element according to the present invention.
19 is a process diagram including a curling roller showing a process of applying a curled portion of a case applied to an electric double layer device according to the present invention.

A preferred embodiment of the electric double layer device according to the present invention will be described with reference to the drawings, and there can be a plurality of embodiments thereof, and the objects, features and advantages of the present invention can be better understood through these embodiments .

FIG. 7A is a perspective view of the electric double layer device according to the present invention as viewed from above, FIG. 7B is a perspective view of the electric double layer device according to the present invention as viewed from the lower side, FIG. 8 is an exploded perspective view showing the electric double layer device according to the present invention, 9 is a cross-sectional view showing an electric double layer device according to the present invention.

10A is a plan view showing a winding unit 10 applied to an electric double layer device according to the present invention, FIG. 10B is a front sectional view showing a winding unit 10 applied to an electric double layer device according to the present invention, FIG. 1 is a developed view of a main part showing a winding unit 10 applied to an electric double layer device according to the present invention.

10A to 10C, a winding unit 10 according to the present invention includes a first current collector 11 extending downward with a separator 10a therebetween, a second current collector 12, For example, the first current collector 11 may be a negative electrode and the second current collector 12 may be a positive electrode. In this case, Of course it is possible to turn around.

The electric double layer device according to the present invention includes a winding unit 10 composed of a first current collector 11 and a second current collector 12 which are wound while being separated by a separator 10a as shown in FIGS. 7A to 10C, A base 20 connected to the first current collector 11 of the winding unit 10 and assembled to the lower portion of the case 20, a case 20 And a cap 40 connected to the second current collector 12 of the winding unit 10.

The winding unit 10 applied to the electric double layer device according to the present invention may be one in which a current collector filled with an electrode and an electrolyte is wound around the separator of Fig. 1 mentioned above in the above [Technical Background of the Invention] Quot; technical literatures ", and the present invention is not limited thereto.

11 is a cross-sectional view of the main part showing the lower end of the case 20 applied to the electric double layer element according to the present invention, the lower end of the under connection side 31b of the under terminal plate 32 and the edge of the under terminal plate 32, 12A is a plan view showing an under connection plate 31 applied to an electric double layer element according to the present invention, and FIG. 12B is a sectional view showing an under connection plate 31 applied to an electric double layer element.

The base 30 applied to the electric double layer device according to the present invention includes an under connection plate 31a connected to the first current collector 11 of the winding unit 10 as shown in Figs. 8, 9 and 11, An under connection plate 31 which is bent downward from the rim of the under connection plate 31a and is in contact with the inner circumference of the case 20 and an under connection plate 31b, The lower end of the case 20 and the lower end of the under connection side 31b and the edge of the under terminal plate 32 are integrally formed with each other It is the biggest technical feature that it is sealed by laser welding.

According to the technical feature of the present invention, the under connection plate 31 is composed of the under connection plate 31a and the under connection side 31b, and the under connection plate 31a is formed on the first current collector 11 of the winding unit 10. [ And the under connection side 31b is bent downward from the rim of the under connection plate 31a so as to be brought into close contact with the inner periphery of the case 20. In this state, The lower end of the lower connecting side face 31b, the lower end of the under connecting side face 31b and the edge of the under-terminal plate 32 are sealed by laser welding in one piece, thereby achieving quick fix (productivity improvement) It is possible to achieve a strong coupling (improvement in coupling) and a maximization of sealing.

13A is a plan view showing an under-terminal plate 32 applied to an electric double-layer device according to the present invention, and FIG. 13B is a cross-sectional view showing an under-terminal plate 32 applied to an electric double-layer device.

The under terminal plate 32 applied to the electric double layer device according to the present invention has a safety vent groove 32a opened on the upper side as shown in FIGS. 13A and 13B, If it goes up, it can be pre-populated.

Since the case 20 is generally made of aluminum and has a large vertical length, when the thickness of the case 20 is increased, not only the weight is significant but also the material cost is increased. Instead of increasing the thickness of the relatively small under-terminal plate 32, the safety vent grooves 32a are provided here to secure the stability, while reducing the material cost and further reducing the weight.

14A and 14B are sectional views of a main portion showing a case 20 and a cap 40 applied to the electric double layer element according to the present invention, 15B is a cross-sectional view showing an upper connection plate 41 which is a constitution of the cap 40 applied to the electric double layer device according to the present invention, and FIG. 16 is a sectional view of the electric double layer device according to the present invention Sectional view showing an upper terminal plate 42 which is a constitution of the applied cap 40. Fig.

The cap 40 applied to the electric double layer device according to the present invention is composed of an upper connecting plate 41a connected to the second current collector 12 of the winding unit 10 as shown in Figs. 14 to 16, An upper terminal frame 42a which is provided on the upper edge of the upper connection plate 41a and an upper connection plate 41 which is an upper connection side 41b bent upward from the rim of the flat plate 41a, And an upper terminal plate 42 having an upper terminal convex portion 42c rising upward from the upper terminal terminal rim 42a.

And a curling rubber 50 surrounding the upper edge 42a of the upper terminal plate 42 from the outer periphery of the upper connecting side 41b of the upper connecting plate 41. Further, And a curling part 22 for curling the upper end of the curling rubber 50 to press the upper side of the curling rubber 50.

The upper connecting plate 41 and the upper terminal plate 42 are wider than the upper surface of the upper connecting plate 41a and the lower surface of the upper terminal frame 42a and the side surfaces of the upper connecting surface 41b and the upper terminal rim 42a The curling portion 50 of the curling portion 50 can be sealed while being pressed against the curling portion 22 at the upper end of the case 20 while maintaining the mutual contact state while being bent, The productivity can be guaranteed.

16, the upper terminal plate 42 includes a contact protrusion 42b that protrudes from the upper end of the upper terminal frame 42a and is pressed against the lower side of the curling rubber 50, So that the airtightness can be further maximized.

In particular, as shown in Fig. 14, the upper end of the upper connecting side 41b and the upper terminal rim 42a of the upper terminal plate 42 are integrally formed by laser welding so that a firm bonding force can be exhibited as well as workability Of course.

17 is a cross-sectional view showing a curling rubber 50 constituting a cap 40 applied to an electric double layer device according to the present invention.

17, the curling rubber 50 applied to the electric double layer device according to the present invention has a vertical portion 51 surrounding the outer periphery of the upper connecting side 41b of the upper connecting plate 41, The horizontal portion 52 covering the upper end of the upper terminal plate 42b of the upper terminal plate 42 and the upper terminal terminal 42a of the upper terminal plate 42 and the side surface of the upper terminal terminal convex portion 42c of the upper terminal plate 42 And a slanting portion 53 which is brought into close contact with the side surface of the upper terminal terminal convex portion 42c by the curling portion 22 at the upper end of the case 20.

The curling rubber 50 has the inclined portion 53 along with the vertical portion 51 and the horizontal portion 52 so that the curling rubber 50 is folded over a wider surface area and the sealing is enabled so that the sealing force can be maximized.

Further, the upper terminal convex portion 42c of the upper terminal plate 42 can be covered by the slanting portion 53, so that a short circuit with the upper end of the case 20 can be prevented in advance.

Further, the curling rubber 50 includes an extension portion 54 extending downward from the vertical portion 51 to the upper end of the winding unit 10, and the case 20 is beaded to form the extension portion 54, So that when the upper portion of the winding unit 10 is close to the beading portion 21, it is possible to prevent a phenomenon (a short phenomenon) that can be brought into contact with each other.

18 is a cross-sectional view showing an upper terminal plate 42, a rubber plug 42e, and an aluminum plug 42f which constitute a cap 40 applied to the electric double layer element according to the present invention.

According to the present invention, as shown in Fig. 18, the upper terminal plate 42 has a center hole 42d, a rubber plug 42e fitted into the center hole 42d, And an aluminum plug 42f welded to the upper end.

In the present invention, after the base 30 is coupled to the lower portion of the case 20, the winding unit 10 is assembled into the case 20, and then the upper portion of the case 20 is coupled to the cap 40, After the electrolyte solution is filled through the center hole 42d, the rubber plug 42e can be simply inserted and then welded as the aluminum plug 42f to be finally sealed.

19 is a process diagram including a curling roller C showing a process of applying the curling portion 22 of the case 20 applied to the electric double layer device according to the present invention.

19, the curling portion 22 is provided on the upper side of the curling rubber 50, that is, on the upper side of the case 20 from 180 degrees to 360 The curling roller C is bent at the upper end of the case 20 with a large primary angle and then bent at the upper end of the case 20 with a gentle secondary angle And the curling portion 22 causes the horizontal portion 52 of the curling rubber 50 to be in contact with the surface of the curling rubber 50 so that the tearing phenomenon of the curling rubber 50 is prevented in advance and the pressing area of the curling rubber 50 is set to So that the sealing effect can be maximized.

The present invention can be applied to a device field for storing electric energy such as a battery, a capacitor, or an electrolytic capacitor.

10: winding unit 10a: separator
11: The 1st Collection 12: The 2nd Collection
20: Case 21:
22: curling portion 30: base
31: under connection plate 31a: under connection plate
31b: under connection side 32: under terminal plate
32a: Safety vent groove 40: Cap
41: Upper connecting plate 41a: Upper connecting flat plate
41b: upper connection side 42: upper terminal plate
42a: upper terminal frame 42b: close-
42c: upper terminal convex portion 42d: center hole
42e: Rubber plug 42f: Aluminum plug
50: curling rubber 51: vertical part
52: horizontal portion 53: oblique portion
54: extension part

Claims

A winding unit 10 composed of a first current collector 11 and a second current collector 12 wound while being separated by a separator 10a; a case 20 accommodating the winding unit 10; A base 30 assembled at a lower portion of the case 20 and connected to the first current collector 11 of the winding unit 10; And a cap (40) connected to the current collector (12)
The base (30)
An under connection plate 31a which is connected to the first current collector 11 of the winding unit 10 and a lower connection plate 31a which is bent downward from the rim of the under connection plate 31a and is in close contact with the inner circumference of the case 20 And an under terminal plate (32) supported under the under connection plate (31a) and abutting against an inner circumference of the under connection side (31b) while being supported by the under connection plate (31a)
Wherein a lower end of the case (20), a lower end of the under connection side (31b), and an edge of the under terminal plate (32) are integrally laser welded to be sealed.

The method according to claim 1,
Characterized in that a safety vent groove (32a) is formed in an upper side of the under-terminal plate (32).

A winding unit 10 composed of a first current collector 11 and a second current collector 12 wound while being separated by a separator 10a; a case 20 accommodating the winding unit 10; A base 30 assembled at a lower portion of the case 20 and connected to a lower side of the first current collector 11 of the winding unit 10; And a cap (40) connected to the upper side of the second current collector (12) of the electric double layer element,
The cap 40 includes an upper connection plate 41a connected to the second current collector 12 of the winding unit 10 and an upper connection side 41b bent upward from the rim of the upper connection plate 41a. An upper terminal frame 42a supported on the upper edge of the upper connection flat plate 41a and an upper terminal terminal protrusion 42c rising upward from the upper terminal frame 42a, And an upper terminal plate (42)
And a curling rubber 50 surrounding the upper edge 42a of the upper terminal plate 42 from the outer periphery of the upper connecting side 41b of the upper connecting plate 41,
And a curling part (22) for curling the upper end of the case (20) to press the upper side of the curling rubber (50)
The curling rubber 50 has a vertical portion 51 surrounding the outer circumferential edge of the upper connecting side 41b of the upper connecting plate 41 and an upper end of the upper connecting side 41b and the upper terminal plate 42, A horizontal portion 52 covering the upper terminal edge 42a of the upper terminal plate 42 and a curved portion 42c of the upper end of the case 20 rising upward in a diagonal direction toward the side of the upper terminal convex portion 42c of the upper terminal plate 42 And a slanting part (53) which is brought into close contact with the side surface of the upper terminal convex part (42c) by an electric wire (22).

The method of claim 3,
Wherein the upper terminal plate (42) includes a contact protrusion (42b) protruding from the upper end of the upper terminal rim (42a) and being closely pressed against the lower side of the curling rubber (50).

The method of claim 3,
And the upper end of the upper connecting side surface (41b) and the upper terminal edge (42a) of the upper terminal plate (42) are uniformly laser welded.

delete

The method of claim 3,
Wherein the curling part (22) curls the upper end of the case (20) at an angle of less than 360 degrees from 180 degrees or more so that the upper side of the curling rubber (50) can be contacted with the surface.

The method of claim 3,
The curling rubber 50 includes an extension 54 extending downward from the vertical portion 51 to the upper end of the winding unit 10,
Characterized in that the case (20) is beaded and has a beading (21) for pushing the extension (54) inward.

The method according to any one of claims 3, 4, 5, 7, and 8,
The upper terminal plate 42 is pierced with a center hole 42d,
A rubber plug 42e is fitted in the center hole 42d,
And an aluminum plug (42f) welded to an upper end of the center hole (42d).