KR20170113909A - Electrochemical energy storage device - Google Patents

Abstract

The present invention relates to an electrochemical energy storage device for improving output while suppressing leakage of an electrolyte solution. The present invention relates to a capacitive element for storing electrochemical energy; A lower terminal board connected to the lower portion of the electric storage element and electrically connected thereto; A case made of a metal material having an internal space formed with an open part with one opened side, a vent part formed on the bottom surface, and a power storage element inserted into the internal space through the opening part so that the lower terminal plate faces the bottom surface; An upper terminal plate inserted into an opening of the case and electrically connected to the electric storage element, the upper terminal plate being fixed by beading and curling with respect to the upper end of the case and sealing the opening of the case; And a rubber gasket interposed between the upper terminal plate and the case.

Description

[0001] Electrochemical energy storage device [0002]

The present invention relates to an electrochemical energy storage device, and more particularly, to an electrochemical energy storage device having improved output while suppressing leakage.

In the information age, high-value-added industries that collect and utilize diverse and useful information in real time through various information and communication devices are leading. In order to secure the reliability of such systems, it is recognized that supply of stable energy is an important factor.

As part of securing stable energy, an electrochemical energy storage device, which can convert electrical energy into chemical energy and store it, and convert it into electrical energy when necessary, is used.

Electrochemical energy storage devices include electrolytic capacitors, super capacitors, electric double layer capacitors (EDLC), and lithium ion capacitors (LIC) And a can type. The can shape includes a cylindrical shape (wound type), a square shape, and the like. At this time, the cylindrical shape is formed by winding the electric storage element in the form of a jelly roll, and then winding it in a cylindrical case.

Cylindrical electrochemical energy storage devices For example, electric double layer capacitors (EDLC) and lithium ion capacitors include a cylindrical case mainly made of aluminum (Al) and a capacitor built in a cylindrical case. At this time, the capacitor element is formed by winding a band-shaped electrode laminate body, specifically a band-shaped electrode laminate body made of an anode and a cathode electrode element, and a separator interposed between the anode and cathode electrode elements, And is formed by taping the outer periphery so that the winding shape is not loosened. The capacitor element thus wound is impregnated with the electrolytic solution, and then embedded in the cylindrical case. A pair of leads electrically connecting the chargeable device to the outside is formed on the upper part of the winded chargeable device. The pair of leads are respectively bonded to the positive electrode and the negative electrode and protruded to the upper portion of the electrode stack body.

In order to safely use such a cylindrical electrochemical energy storage device, the electrode laminate is enclosed in a case and sealed with a rubber cap. At this time, the rubber cap is sealed and fixed through beading and curling to the upper end of the case. The upper end of the lead penetrates through the river cap and protrudes outward.

 When such a cylindrical electrochemical energy storage device is used for a long time, foreign substances are generated on the surface of the rubber cap, and the lifetime of the cylindrical electrochemical energy storage device due to foreign substances is shortened. That is, although the rubber cap is fixed by beading and a cylinder, leakage may occur between the case and the rubber cap due to the difference in thermal expansion coefficient between the metal case and the rubber cap.

In addition, since the cylindrical electrochemical energy storage device is charged and discharged through a pair of leads, there is a limit in performing a charge and discharge operation smoothly. As a result, there is a limit to improving the output in the case of a cylindrical electrochemical energy storage device using a lead.

Patent Publication No. 10-1508646 (issued on April 4, 2015)

Accordingly, an object of the present invention is to provide an electrochemical energy storage device capable of solving the problem of leakage caused by the use of a rubber cap.

It is another object of the present invention to provide an electrochemical energy storage device capable of improving the output.

In order to achieve the above object, the present invention provides a charge storage device for storing electrochemical energy; A lower terminal board electrically connected to the lower portion of the electric storage element; A metal material having an internal space formed with an open part with one open side and a vent part formed on the bottom surface and the storage element inserted into the internal space through the opening part so that the lower terminal plate faces the bottom surface, Manufactured case; An upper terminal board inserted into an opening of the case and electrically connected to the power storage device, the upper terminal board being fixed by beading and curling with respect to the upper end of the case and sealing the opening of the case; And a rubber gasket interposed between the upper terminal plate and the case.

The charging device includes a positive electrode, a separator, a negative electrode, and an electrode laminated body including an electrolytic solution.

The lower terminal plate may be fixed to the lower portion of the case by beading or ultrasonic welding.

The upper terminal plate includes: a junction plate bonded to an upper surface of the electric storage element; A gasket fitting tube protruding upward from an edge of the joint plate and having a gasket fitted to an outer surface thereof; And a terminal protruding from the upper surface of the joint plate inside the gasket fitting pipe higher than the gasket fitting pipe.

The gasket covers the gasket fitting pipe and has a protrusion protruding from the upper portion of the gasket fitting pipe.

The projecting portion of the gasket is positioned between the upper end of the case to be curled and the upper end face of the gasket fitting pipe.

The gasket may include a first gasket coupled to a lower portion of the gasket fitting tube and having a beaded portion inserted therein; And a second gasket portion connected to the first gasket portion and having an outer diameter larger than that of the first gasket portion and positioned between an upper end of the case curled at an upper end portion and an upper end surface of the gasket- .

The rubber material of the gasket may be butyl rubber.

The present invention also relates to a charge storage device for storing electrochemical energy; A lower terminal board electrically connected to the lower portion of the electric storage element; An upper terminal plate electrically connected to the upper portion of the electric storage element; A rubber gasket fitted to the outer surface of the upper terminal plate; And an inner space formed with an opening portion having one opening, a vent portion formed on the bottom surface, the power storage element is inserted into the inner space through the opening portion so that the lower terminal plate faces the bottom surface, And a case of a metal material sealed by the upper terminal plate via the gasket by beading and curling of the gasket.

According to the present invention, leakage of liquid can be suppressed by sealing the case through beading and curling with a rubber gasket interposed between the upper terminal plate of the metal material and the case.

The lower terminal plate and the upper terminal plate are bonded to the lower surface and the upper surface of the electrode stacked body and used as the electrode terminals of the electrochemical energy storage device, respectively, so that the output characteristics can be improved as compared with the existing leads.

The lower terminal plate is bonded to the lower portion of the case by beading or ultrasonic welding. The upper terminal plate is sealed with an opening of the case by beading and curling with a rubber gasket interposed therebetween while the inner electrode laminate is stably Can be fixed.

1 is an exploded perspective view of an electrochemical energy storage device according to an embodiment of the present invention.
FIG. 2 is a perspective view showing the electrochemical energy storage device of FIG. 1; FIG.
3 is a cross-sectional view of the electrochemical energy storage device of FIG.

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 an exploded perspective view of an electrochemical energy storage device according to an embodiment of the present invention. FIG. 2 is a perspective view showing the electrochemical energy storage device of FIG. 1; FIG. And Figure 3 is a cross-sectional view of the electrochemical energy storage device of Figure 1.

1 to 3, the electrochemical energy storage device 100 according to the present embodiment includes a capacitor element 10, a lower terminal plate 20, a case 30 made of a metal material, an upper terminal plate 40, And a gasket 60 of rubber material. The capacitor element 10 stores electrochemical energy. The lower terminal plate 20 is electrically connected to the lower portion of the capacitor element 10 by being joined thereto. The case 30 has an internal space 33 formed with an open portion 31 opened at one side and a bent portion 35 formed at the bottom surface of the case 30. The lower terminal plate 20 is opened The capacitor element 10 is inserted into the internal space 33 through the opening 31 and embedded therein. The upper terminal plate 40 is inserted into the opening 31 of the case 30 and electrically connected to the battery element 10 and is fixed by beading and curling to the upper end of the case 30 . The gasket 60 is interposed between the upper terminal plate 40 and the case 30.

Although the electrochemical energy storage device 100 according to the embodiment of the present invention has been described in the form of a cylindrical structure, the electrochemical energy storage device 100 may be realized in the form of a quadrangular pole.

Here, the capacitor element 10 includes a winding core 11 and an electrode stack body 13 wound around the winding core 11. The core (11) may be removed after the electrode stack (13) is wound.

The electrode stack body 13 includes a cathode, a cathode, a separator, and an electrolytic solution. The anode produces electrons by an oxidation reaction. The cathode absorbs the generated electrons and a reduction reaction occurs. The separator is interposed between the cathode and the anode to physically separate the cathode and the anode so as to separate the oxidation and reduction reactions from each other. Electrolyte is a transport medium of ions that store electrical energy in the anode and cathode. In this electrode stack body 13, the positive electrode, the negative electrode, and the separator are sequentially wound around the core 11 to form a cylindrical shape as a whole. For example, the electrode stack body 13 may have a cell structure forming a supercapacitor, an electric double layer capacitor (EDLC), and a lithium ion capacitor (LIC).

The case 30 is for separating the battery element 10 from the outside and can be manufactured in various materials and shapes depending on the type of the battery element 10. [ The case 30 has a tubular shape in which an opening 31 is formed on one side and the other side is closed. The case 30 is provided with an internal space 33 into which the power storage device 10 can be inserted through the opening 31. [ The case 30 is formed with a vent portion 35 for discharging the gas generated during the operation of the electrochemical energy storage device 100 to the outside of the case 30 when the gas is charged to a predetermined pressure or higher in the internal space 33 have. As the material of the case 30, a metal material such as aluminum, stainless steel, or tin-plated steel may be used.

In case 30, "B" represents the beading portion and "C" represents the curling portion. The beading portion is recessed inwardly from the outer surface of the case (30). The curled portion is formed by bending the upper end of the case 30 in a C shape and closely contacting the upper surface of the upper terminal plate 40 with the gasket 60 interposed therebetween. As a result, the case 30 and the upper terminal plate 40 are electrically separated from each other by the gasket 60.

The lower terminal plate 20 is electrically connected to the lower portion of the capacitor element 10 by being joined thereto. As a method of joining the lower terminal plate 20, laser welding or ultrasonic welding may be used. The lower terminal plate 20 is fixed to the lower portion of the case 30 by beading or ultrasonic welding. In this embodiment, an example has been disclosed in which the lower terminal plate 20 is fixed by beading, and "B1" represents the corresponding portion.

The upper terminal plate 40 is bonded to the upper portion of the capacitor element 10. As a method of joining the upper terminal plate 40, laser welding or ultrasonic welding may be used.

At this time, the lower terminal board 20 and the upper terminal board 40 may be made of the same metal material as the case 30. [

Since the lower terminal plate 20 and the upper terminal plate 40 are electrically connected to the upper and lower surfaces of the electrode stack body 13, the output characteristics of the electrochemical energy storage apparatus 100 according to the present embodiment can be improved . The electrochemical energy storage device 100 according to the present embodiment has a structure in which the lower terminal plate 20 and the upper terminal plate 40 having a larger contact area than the existing leads are connected to each other through the upper terminal plate 40 Charge / discharge is performed. For example, the upper terminal plate 40 may be used as a negative terminal, and the case 30 connected to the lower terminal plate 20 may be used as a positive terminal.

The upper terminal board 40 includes a joint plate 41, a gasket fitting pipe 43, and a terminal 45. The junction plate 41 is bonded to the upper surface of the battery element 10. The gasket fitting pipe 43 is formed so as to protrude upward from the periphery of the joining plate 41, and the gasket 60 is fitted on the outer side. The terminal 45 protrudes from the upper surface of the joint plate 41 inside the gasket fitting pipe 43 higher than the gasket fitting pipe 43.

The gasket 60 is made of a rubber material having insulating properties and suppresses leakage of the electrolyte between the case 30 and the upper terminal plate 40. The gasket 60 may be provided to be fitted on the outer surface of the upper terminal plate 40. As the material of the gasket 60, butyl rubber may be used.

The gasket 60 covers the gasket fitting pipe 43 and has a protruding portion 65 protruding at a certain portion from the upper portion of the gasket fitting pipe 43. The protrusion 65 of the gasket 60 is positioned between the upper end of the case 30 to be curled and the upper end face of the gasket fitting pipe 43. That is, the protrusion 65 blocks the electrical connection between the case 30 and the upper terminal plate 40.

The gasket 60 includes a first gasket portion 61 and a second gasket portion 63. The first gasket portion 61 is coupled to the lower portion of the gasket fitting pipe 43, and a case portion B to be bead is inserted. The second gasket portion 63 is connected to the first gasket portion 61 and has an outer diameter larger than that of the first gasket portion 61. The upper end of the case 30, And a projection 65 positioned between the top surfaces.

After the lower terminal plate 20, the electric storage element 10 and the upper terminal plate 40 are inserted into the inner space 33 of the case 30 through the opening 31 of the case 30, the gasket 60 The upper end of the case 30 is closely attached to the upper terminal board 40 by beading and curling to seal the opening 31 of the case 30. [ That is, in the present embodiment, the opening portion 31 of the case 30 is joined to the upper terminal plate 40 by beading and curling with respect to the upper terminal plate 40 having the rubber material gasket 60 inserted therebetween without using the leads and the rubber caps. It is possible to solve the leakage problem of the electrolytic solution and to increase the rigidity against external impact. Further, sealing of the opening 31 of the case 30 can be performed more simply.

The lower terminal plate 20 and the upper terminal plate 30 are bonded to the lower surface and the upper surface of the electrode stack body 13 and used as the electrode terminals of the electrochemical energy storage device 100, The output characteristics can be improved.

The lower terminal plate 20 is bonded to the lower portion of the case 30 by beading or ultrasonic welding and the upper terminal plate 40 is joined to the opening 30 of the case 30 by beading and curling through a gasket 60 made of a rubber material. The inner electrode stack body 13 can be stably fixed to the inner space 33 of the case 30 while the inner electrode assembly 31 is sealed.

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: Capacitor element
11: Reason
13: electrode laminate
20: Lower terminal board
30: Case
31:
33: Internal space
35:
40: upper terminal board
41:
43: Gasket fitting pipe
45: terminal
60: Gasket
61: first gasket portion
63: second gasket portion
65: protrusion
100: Electrochemical energy storage device

Claims (9)

A capacitive element for storing electrochemical energy;
A lower terminal board electrically connected to the lower portion of the electric storage element;
A metal material having an internal space formed with an open part with one open side and a vent part formed on the bottom surface and the storage element inserted into the internal space through the opening part so that the lower terminal plate faces the bottom surface, Manufactured case;
An upper terminal board inserted into an opening of the case and electrically connected to the power storage device, the upper terminal board being fixed by beading and curling with respect to the upper end of the case and sealing the opening of the case; And
A rubber gasket interposed between the upper terminal plate and the case;
And an electrochemical energy storage device. The method according to claim 1,
Wherein the charge element comprises a positive electrode, a separator, a negative electrode, and an electrolyte solution, and a wound electrode stack. The method according to claim 1,
Wherein the lower terminal plate is fixed to the lower portion of the case by beading or ultrasonic welding. The electronic device according to claim 1,
A junction plate bonded to an upper surface of the capacitor element;
A gasket fitting tube protruding upward from an edge of the joint plate and having a gasket fitted to an outer surface thereof; And
A terminal protruding from the upper surface of the joint plate inside the gasket fitting pipe higher than the gasket fitting pipe;
And an electrochemical energy storage device. 5. The method of claim 4,
Wherein the gasket covers the gasket fitting pipe and has a protrusion protruding from the gasket fitting pipe at an upper portion thereof. 6. The method of claim 5,
Wherein the protrusion of the gasket is located between the upper end of the case to be curled and the upper surface of the gasket fitting tube. 6. The gasket according to claim 5,
A first gasket coupled to a lower portion of the gasket fitting pipe and having a beaded case portion inserted therein; And
A second gasket portion connected to the first gasket portion and having an outer diameter larger than that of the first gasket portion and positioned between an upper end of the case curled at an upper end portion and an upper end surface of the gasket fitting pipe;
And an electrochemical energy storage device. The method according to claim 1,
Wherein the rubber material of the gasket is butyl rubber. A capacitive element for storing electrochemical energy;
A lower terminal board electrically connected to the lower portion of the electric storage element;
An upper terminal plate electrically connected to the upper portion of the electric storage element;
A rubber gasket fitted to the outer surface of the upper terminal plate; And
Wherein the battery device has an internal space in which an opening portion with one opening is formed, a vent portion is formed on the bottom surface, the electric storage element is inserted into the internal space through the opening portion so that the lower terminal plate faces the bottom surface, A metal case sealed to the upper terminal plate via the gasket by beading and curling;
And an electrochemical energy storage device.

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