KR20170113906A - Electrochemical energy storage device of axial type - Google Patents

Abstract

The present invention relates to an electrochemical energy storage device for suppressing leakage generation and simplifying manufacturing fixation. The present invention relates to a capacitive element for storing electrochemical energy; A lower terminal plate joined to a lower portion of the capacitor element; A tubular case made of a metal material in which an opening is formed on one side and a capacitor element is inserted through the opening so that the lower terminal plate faces the bottom; An upper terminal board inserted into an opening of the case and electrically connected to the electric storage element, the upper terminal board being fixed by beading and curling with respect to the upper end of the case; And a rubber gasket interposed between the upper terminal plate and the case.

Description

[0001] The present invention relates to an electrochemical energy storage device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrochemical energy storage device, and more particularly, to an axial-type electrochemical energy storage device that suppresses leakage and simplifies manufacturing and fixing.

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. The cylindrical shape is also referred to as an axial type.

Electrochemical energy storage devices of an axial type 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. Such an axial type electric double layer capacitor (EDLC) is mainly applied for the purpose of driving a motor of a wind power, a solar, an electric car or a hybrid car. 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 terminal plate for electrically connecting the capacitor element to the outside is disposed on the upper part of the winded capacitor element.

In addition, a neck portion is formed at an upper portion of the case to prevent the terminal plate from being pushed down, and the wound electric element is embedded after the neck is formed in the case. The charge element and the external terminal are electrically connected by a terminal. Then, the terminal board is fixed to the case through a curling process in which the upper end of the case is bent.

The conventional axial type electrochemical energy storage device has a problem that the manufacturing process is complicated and the productivity is lowered because the manufacturing process is performed through a plurality of laser welding processes on the cylindrical case.

In particular, the terminal plate is joined to the open lower portion or the upper portion of the cylindrical case by laser welding. However, since the bonding force of the portions joined by laser welding is somewhat lowered, it is vulnerable to external impact, and there is a problem that leakage occurs along the bonded portion.

Further, a gas releasing part (gas discharging part) is provided on the upper terminal plate. Since the gas releasing part has a membrane structure of a membrane structure, it is complicated in structure and is difficult to manufacture.

Patent Registration No. 10-1416808 (Announcement of Sep. 2014, 2014)

Accordingly, an object of the present invention is to provide an axial-type electrochemical energy storage device which is simple in structure and can simplify a manufacturing process.

Another object of the present invention is to provide an axial-type electrochemical energy storage device capable of suppressing the occurrence of leakage through a welding portion.

It is still another object of the present invention to provide an axial-type electrochemical energy storage device resistant to an external impact.

Still another object of the present invention is to provide an axial-type electrochemical energy storage device in which the structure of the gas discharge portion is simplified.

In order to achieve the above object, the present invention provides a charge storage device for storing electrochemical energy; A lower terminal plate bonded to a lower portion of the capacitor element; A tubular case made of a metal material in which an opening is formed on one side and the capacitor is inserted through the opening so that the lower terminal plate faces the bottom; 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 to the upper end of the case; And a rubber gasket interposed between the upper terminal plate and the case. The present invention also provides an electrochemical energy storage device of an axial type.

The charge storage device comprises: an electrode stacked body including an anode, a separator, a cathode, and an electrolytic solution; A bottom inner plate interposed between and bonded to a lower portion of the electrode stacked body and a lower terminal plate; And a top inner plate interposed between and bonded to an upper portion of the electrode stacked body and the upper terminal plate.

The lower terminal plate and the upper terminal plate may be joined to the bottom inner plate and the top inner plate by laser welding or ultrasonic welding, respectively.

The upper terminal plate includes: a terminal plate body having a terminal formed therein and a fastening hole formed at a central portion thereof; An insulating plate attached to an upper surface of the terminal plate body outside the fastening hole and having an edge portion and a rim of the gasket and an upper end portion of the curled case closely fitted and fixed; And a gas discharging portion which is fastened to the fastening hole and discharges the gas generated inside the case to the outside through the fastening hole.

Wherein the gas discharging portion includes: a rubber stopper inserted into a lower portion of the fastening hole; And a sealing bolt coupled to the fastening hole on the upper portion of the rubber stopper.

The terminal plate body may have the fastening hole including an insertion hole connected to the lower surface, and a bolt fastening hole having an inner diameter larger than that of the insertion hole and fastening the fastening bolt.

The terminal is formed so as to protrude from a central portion of an upper surface of the terminal plate body, the fastening hole is formed inside the terminal, and the insulating plate is positioned outside the terminal lower than the terminal.

The electrolyte solution of the electrode laminate can be injected through the fastening holes of the upper terminal plate.

The rubber material of the gasket may be butyl rubber.

The present invention also provides a connector comprising: a terminal plate body having a fastening hole formed in a central portion thereof; An insulating plate attached to an upper surface of the terminal plate body outside the fastening hole, the edge of the gasket and the upper end of the curled case being tightly fixed to the edge portion; And a gas discharging portion which is fastened to the fastening hole and discharges the gas generated inside the case to the outside through the fastening hole. The present invention also provides an upper terminal plate for an electrochemical energy storage device.

According to the present invention, an opening is formed on one side of the case, and the upper terminal plate covers the opening of the case by beading and curling the upper portion of the case using a butyl rubber gasket, Therefore, welding is not performed to the case portion. Accordingly, the axial-type electrochemical energy storage device according to the present invention can fundamentally block the occurrence of leakage through the existing welding portion and increase the rigidity against external impact.

The electrochemical energy storage device of the axial type according to the present invention has a simple structure and can simplify the manufacturing process.

Since the gas generated in the case can be smoothly discharged to the outside through the gas discharging part including the rubber stopper and the sealing bolt provided on the upper terminal plate according to the present invention, The structure of the negative portion can be simplified.

FIG. 1 is a view showing an apparatus for storing an electrochemical type of electrochemical energy according to an embodiment of the present invention.
Fig. 2 is an enlarged view of a portion A in Fig. 1, showing a state in which an upper terminal plate is fixed to an upper portion of the case.
Fig. 3 is a view showing the gas discharging portion of Fig. 1;

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.

FIG. 1 is a view showing an apparatus for storing an electrochemical type of electrochemical energy according to an embodiment of the present invention. Fig. 2 is an enlarged view of a portion A in Fig. 1, showing a state in which an upper terminal plate is fixed to an upper portion of the case. And FIG. 3 is a view showing the gas discharging portion of FIG.

1 to 3, an axial type electrochemical energy storage device 100 according to the present embodiment includes a capacitor 10, a lower terminal plate 20, a tubular case 30 made of a metal material, An upper terminal plate 40, and a gasket 60 made of rubber. 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 opening 31 on one side and the capacitor element 10 is inserted through the opening 31 so that the lower terminal plate 20 faces the bottom. 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.

In the axial type electrochemical energy storage device 100 according to the present embodiment, the upper terminal plate 40 is used as an anode terminal, and the case 30 connected to the lower terminal plate 20 can be used as a cathode terminal.

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. A bottom inner plate 15 and a top inner plate 17 are bonded to the lower and upper portions of the electrode stack body 13, respectively.

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. [ 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 coming into close contact with the gasket 60 and the insulating plate 49. As a result, the case 30 and the upper terminal plate 40 are electrically separated from each other.

The lower terminal plate 20 is bonded to the lower portion of the electric storage element 10 and bonded thereto via the bottom inner plate 15. [ As a method of joining the lower terminal plate 20, laser welding or ultrasonic welding may be used.

The upper terminal plate 40 is bonded to the upper portion of the electric storage element 10, and is joined via the upper inner plate 17. [ 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. [

The bottom inner plate 15 and the top inner plate 17 are electrically connected to the lower surface and the upper surface of the electrode stack body 13, respectively. Since the lower terminal plate 20 and the upper terminal plate 40 are electrically connected to the electrode stack body 13 through the bottom inner plate 15 and the top inner plate 17, The output characteristics of the electrochemical energy storage device 100 can be improved.

The upper terminal plate 40 includes a terminal plate body 41 having a terminal 47, an insulating plate 49, and a gas discharging portion 51. The terminal plate body 41 has a terminal 47 formed thereon and a fastening hole 43 formed at the center thereof. The insulating plate 49 is attached to the upper surface of the terminal plate body 41 outside the fastening hole 43 and the rim of the gasket 60 and the upper end of the curled case 30 are closely fixed to the edge portion. The gas discharge portion 51 is fastened to the fastening hole 43 and discharges gas generated inside the case 30 through the fastening hole 43 to the outside.

Here, the terminal 47 is formed so as to protrude from the central portion of the upper surface of the terminal plate body 41. A fastening hole 43 is formed on the inside of the terminal 47 and an insulating plate 49 is located on the outside of the terminal 47 lower than the terminal 47.

The insulating plate 49 prevents electric short-circuiting between the case 30 and the upper terminal plate 40. The insulating plate 49 allows the upper end of the case 30 to be curled to be stably stuck on the upper terminal board 40 stably together with the gasket 60. As the material of the insulating plate 49, a plastic material such as PE (polyethylene), PP (polypropylene), PPS (polyphenylene sulfide), PEEK (polyetheretherketone) or PTFE (polytetrafluoroethylene)

The gas discharge portion 51 includes a rubber stopper 53 inserted into the lower portion of the fastening hole 43 and a sealing bolt 55 fastened to the fastening hole 43 at the upper portion of the rubber stopper 53. The fastening hole 43 has an insertion hole 44 connected to the lower surface of the terminal plate body 41 and a bolt fastening hole 45 having an inner diameter wider than the insertion hole 44 and fastened with the fastening bolt 55 . The sealing bolt 55 is formed with a hole penetrating the center portion.

The sealing bolt 55 seals the fastening hole 43 by pressing the rubber stopper 53. When gas is generated in the inner space 33 of the case 30, the gas pushes the rubber stopper 53 toward the sealing bolt 55. When the rubber stopper 53 is contracted by the pressure exerted by the gas and a gap is formed between the rubber stopper 55 and the insertion hole 44, the gas escapes through the gap. The gas that has escaped through the gap between the rubber stopper 53 and the insertion hole 44 is discharged to the outside through the gap formed between the sealing bolt 55 and the bolt fastening hole 45 do.

When a certain amount of gas is discharged, the shrunk rubber stopper 53 is restored to its original shape by the restoring force and blocks the insertion hole 44 again.

The electrolytic solution can be injected into the inner space 33 of the case 30 through the fastening hole 43 before the fastening hole 43 is sealed through the gas discharge portion 51. [ At this time, it is preferable that the electrolyte is injected after the opening portion 31 of the case 30 is sealed with the upper terminal plate 40. After the electrolytic solution is injected, the fastening hole 43 is sealed with the gas discharge portion 51.

The gasket 60 suppresses leakage of the electrolyte between the case 30 and the upper terminal plate 40. As the material of the gasket 60, butyl rubber may be used.

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 brought into close contact with the upper terminal board 40 by beading and curling so as to seal the opening 31 of the case 30. That is, in the present embodiment, since the opening portion 31 of the case 30 can be sealed with the upper terminal plate 40 by beading and curling without welding to the upper terminal plate 40, ) Sealing can be performed more simply. Further, since the open portion 31 of the case 30 can be sealed without welding, the leakage problem of the electrolyte through the existing welded portion can be solved, and the rigidity against external impact can be increased.

The electrochemical energy storage device 100 of the axial type according to the present embodiment has a simple structure and can simplify the manufacturing process. That is, since welding is performed only when the lower and upper terminal plates 20 and 40 are bonded to the battery element 10, the number of times of welding can be reduced as compared with the conventional method. As a result, it is possible to suppress the occurrence of welding defects due to a large number of welds. By reducing the number of times of welding, it is possible to simplify the manufacturing process of the axial-type electrochemical energy storage device 100, thereby increasing the reliability of the manufacturing process.

The electrochemical energy storage device 100 of the axial type according to the present embodiment includes a rubber stopper 53 provided on the upper terminal plate 40 and a gas discharging portion 51 including a sealing bolt 55. [ It is possible to smoothly discharge the gas generated in the inside of the gas discharge portion 30 to the outside, so that the structure of the gas discharge portion 51 can be simplified.

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
15: Bottom inner plate
17: Top inner plate
20: Lower terminal board
30: Case
31:
33: Internal space
40: upper terminal board
41: terminal plate body
43: fastening hole
44: insertion hole
45: Bolt tightening hole
47: terminal
49: Insulating plate
51:
53: Rubber plug
55: Sealing bolt
60: Gasket
100: Electrochemical energy storage device

Claims (11)

A capacitive element for storing electrochemical energy;
A lower terminal board electrically connected to the lower portion of the electric storage element;
A tubular case made of a metal material in which an opening is formed on one side and the capacitor is inserted through the opening so that the lower terminal plate faces the bottom;
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 to the upper end of the case; And
A rubber gasket interposed between the upper terminal plate and the case;
And an electrochemical energy storage device. The charge-accumulating device according to claim 1,
A rolled electrode laminate including an anode, a separator, a cathode, and an electrolyte;
A bottom inner plate interposed between and bonded to a lower portion of the electrode stacked body and a lower terminal plate; And
A top inner plate interposed between and bonded to the upper portion of the electrode stacked body and the upper terminal plate;
And an electrochemical energy storage device. 3. The method of claim 2,
Wherein the lower terminal plate and the upper terminal plate are joined to the bottom inner plate and the top inner plate by laser welding or ultrasonic welding, respectively. The electronic device according to claim 1,
A terminal board body on which terminals are formed and fastening holes are formed in a central portion thereof;
An insulating plate attached to an upper surface of the terminal plate body outside the fastening hole and having an edge portion and a rim of the gasket and an upper end portion of the curled case closely fitted and fixed; And
A gas discharge unit which is connected to the fastening hole and discharges gas generated inside the case to the outside through the fastening hole;
And an electrochemical energy storage device of an axial type. 5. The method of claim 4,
The gas-
A rubber stopper inserted into a lower portion of the fastening hole; And
And a sealing bolt coupled to the fastening hole on the upper portion of the rubber stopper,
Wherein the terminal plate body is formed with the fastening hole including an insertion hole connected to the lower surface and a bolt fastening hole having an inner diameter larger than that of the insertion hole and fastened with the fastening bolt, Storage device. 6. The method of claim 5,
Wherein the terminal is formed so as to protrude from a central portion of an upper surface of the terminal plate body, the fastening hole is formed inside the terminal, and the insulating plate is positioned outside the terminal, lower than the terminal. Type electrochemical energy storage device. The method according to claim 6,
Wherein the electrolyte solution of the electrode laminate is injected through the fastening holes of the upper terminal plate. The method according to claim 1,
Wherein the rubber material of the gasket is a butyl rubber. A terminal plate body having a fastening hole formed at a central portion thereof;
An insulating plate attached to an upper surface of the terminal plate body outside the fastening hole, the edge of the gasket and the upper end of the curled case being tightly fixed to the edge portion; And
A gas discharging unit which is coupled to the fastening hole and discharges gas generated inside the case to the outside through the fastening hole;
And an upper terminal plate for the electrochemical energy storage device. 10. The fuel cell system according to claim 9,
A rubber stopper inserted into a lower portion of the fastening hole; And
And a sealing bolt coupled to the fastening hole on the upper portion of the rubber stopper,
Wherein the terminal board body is formed with the fastening hole including an insertion hole for inserting the rubber stopper and a bolt fastening hole having an inner diameter larger than that of the insertion hole and fastening the fastening bolt, An upper terminal plate for an axial type electrochemical energy storage device. 11. The method of claim 10,
And a terminal protruding from a central portion of an upper surface of the terminal plate body,
Wherein the fastening hole is formed on the inner side of the terminal and the insulating plate is located on the outer side of the terminal lower than the terminal.

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