JP2001126961A - Electric double-layer capacitor element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify and miniaturize the product structure of an electric double- layer capacity, and at the same time, to improve the method for insulating the outer peripheral edges of the current-collecting bodies of an electric double- layer capacitor element. SOLUTION: An electric double-layer capacitor element, which is constituted by laminating a plurality of electric double-layer capacitor cells upon another, is formed in such a way that the current-collecting bodies of the capacitor cells are not exposed on the external surface of the capacitor element nor come into contact with the internal surface of a bottomed cylindrical metallic case, by arranging the current-collecting bodies of the capacitor cells, in such a way that the outer peripheral edges of all the bodies are positioned 5 μm or larger further inside of the external surface of the capacitor element.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric double layer capacitor element, and more particularly, to an element structure suitable for insulating an inner surface of a bottomed cylindrical metal case from an electric double layer capacitor element.

[0002]

2. Description of the Related Art Conventionally, this kind of electric double layer capacitor element (hereinafter simply referred to as "element") 2 is shown in FIG.
The configuration was as shown in FIG. That is, the electric double layer capacitor element 2 is formed by stacking a plurality of electric double layer capacitor cells (hereinafter, referred to as “basic cells”) 3. Each basic cell 3 includes a gasket 31, a current collector 32, an electrode 33 impregnated with an electrolyte, and a separator. Here, the outer diameter of the current collector 32 is the same as the outer diameter of the gasket 31, and has a structure in which the outer peripheral edge 32 a of the current collector 32 is exposed on the outer surface A of the plurality of stacked basic cells 3. In the electric double-layer capacitor using the element 2, as shown in FIG. 4, an inner surface 7 a of a bottomed cylindrical metal case (hereinafter simply referred to as “metal case”) 7 covered with an insulating sleeve 8.
In order for the current collector 32 of the element 2 to come into contact with and short-circuit, a bottomed cylindrical insulating case (hereinafter simply referred to as “insulating case”) 9 was required (for example, JP-A-4-237109, JP-A-4-237109). 4-280517).

[0003] Further, in the element 2 disclosed in Japanese Patent Application Laid-Open No. 8-78291 shown in FIG.
Since the outer peripheral edge 32a of the second current collector 2 is exposed, a complete insulation method cannot be achieved, and there is a danger that these current collectors 32 may come into contact with the metal case and short-circuit (see Japanese Patent Application Laid-Open No. 8-78291). ).

[0004]

In the conventional device 2 as shown in FIG. 3A, the outer peripheral edge 32a of the current collector 32 appears on the outer surface A of the basic cell 3, and this portion is formed of a metal case. 7 is short-circuited by contact with the inner side surface 7a of the element 7 and the series resistance of the basic cells 3 that are stacked in a plurality is destroyed.

[0005] This has necessitated an increase in the complexity of the product structure and the variety of members used, which has been an obstacle to the simplification and miniaturization of the product.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electric double layer capacitor element in which an insulating case is not required and components can be simplified, thereby reducing the cost and size of a product. It is in.

[0007]

According to the present invention, there is provided an electric double layer capacitor element formed by stacking a plurality of electric double layer capacitor cells. The outer peripheral edge of the current collector is arranged inside the outer surface of the electric double layer capacitor element, so that the outer peripheral edges of all the current collectors of the plurality of electric double layer capacitor cells are It does not appear on the outer side surface, and has a structure to prevent contact and short circuit between the inner side surface of the bottomed cylindrical metal case and the outer peripheral edge of all current collectors of the electric double layer capacitor cell at the time of exterior. Thus, an electric double layer capacitor element can be obtained.

[0008]

FIG. 1 shows an electric double layer capacitor element according to an embodiment of the present invention. FIG. 1 (a) is a sectional view of the electric double layer capacitor element, and FIG. 1 (b) is an electric double layer capacitor element shown in FIG. It is sectional drawing of the electric double layer capacitor cell which comprises a multilayer capacitor element.

Referring to FIG. 1, an electric double layer capacitor element 2 of the present embodiment is formed by laminating a plurality of electric double layer capacitor cells 3.

Each electric double layer capacitor cell 3 includes a pair of gaskets 31, 31, two current collectors 32, a pair of electrodes 33, 33, and a separator. The gasket 31 has a ring shape and is made of a non-conductive rubber material. The current collector 32 has a disk shape and is made of a conductive rubber material. The electrode 33 is a powdered or solid activated carbon electrode impregnated with an electrolytic solution (such as dilute sulfuric acid). The separator 34 has a disk shape and is made of a non-conductive rubber material.

A feature of the present invention resides in the current collector 32.
The outer peripheral edge 32a of all the current collectors 32 is formed on the outer surface A of the gasket 31 (the outer surface A of the gasket 31 becomes the outer surface A of the electric double layer capacitor element 2 after the electric double layer capacitor cells 3 are stacked. ). This is because the outer diameter of the current collector 32 is
This is achieved by making the outer diameter smaller than (for example, 5 μm or more).

When the electric double layer capacitor cell 3 is manufactured, the separator 3 is placed between the pair of gaskets 31, 31.
4 are interposed, and these are vulcanized and bonded in advance to make a vessel. Thereafter, a pair of electrodes 33, 33 are disposed in the container, and the current collector 3 is provided on the upper end surface and the lower end surface of the container, respectively.
2 is vulcanized and bonded. Thus, one electric double layer capacitor cell 3 is manufactured.

By stacking six electric double layer capacitor cells 3 thus manufactured, the electric double layer capacitor element 2 of the present embodiment is formed. In this way, with the electric double layer capacitor cells 3 placed in a stacked state, the outer peripheral edges 32a of all the current collectors 32 are located at the place where they are drawn from the outer surface A of the electric double layer capacitor element 2, and the outer surface A Not exposed to

FIG. 2 is a sectional view of an electric double layer capacitor using the electric double layer capacitor element shown in FIG.

Referring to FIG. 2, this electric double layer capacitor 1 is different from electric double layer capacitor element 2 shown in FIG.
A polar plate-shaped lead terminal 4, a positive pole-shaped plate-shaped lead terminal 5,
Insulating plate 6, bottomed cylindrical metal case 7, insulating sleeve 8
Consisting of

The electric double layer capacitor element 2 includes an insulating plate 6
Are placed on the plate-like lead terminals 4 and 5 with the metal sleeve 7 covered with the insulating sleeve 8 and then the lower end of the metal case 7 is wound inside. As a result, the electric double layer capacitor element 2 is held in the metal case 7 while being pressed in the direction in which the electric double layer capacitor cells 3 are stacked.

As described above, since the electric double layer capacitor element 2 has an insulating structure, an insulator is interposed between the outer surface A of the electric double layer capacitor element 2 and the inner surface 7a of the metal case 7. 2, that is, as is apparent from FIG. 2, the electric double-layer capacitor 1 does not require the use of a cylindrical insulating case having a bottom as in the conventional case, and has a negative plate-like lead terminal 4 and a positive electrode plate. It is only necessary to insulate only between the lead terminals 5 with the disk-shaped insulating plate 6.

As described above, according to the electric double layer capacitor element 2 of the present embodiment shown in FIG.
The electric double-layer capacitor cell 3 itself shown in (b) has a structure in which the outer peripheral edge 32a of the current collector 32 does not appear on the outer surface A of the gasket 31, and has an insulating structure with the inner surface 7a of the metal case 7. Therefore, unlike the conventional electric double layer capacitor 1 shown in FIG. 4, there is no need to interpose the insulating case 9 so that the inner surface 7a of the metal case 7 does not contact the outer surface A of the element 2.

As a result, in the electric double-layer capacitor 1 shown in FIG. 2, even if the inner surface 7a of the metal case 7 and the outer surface A of the element 2 come into contact with each other, no short circuit occurs, so that the shape of the insulating case 8 shown in FIG. Of the bottomed cylinder, which is a restriction of the above, only one lead terminal 4 and the other lead terminal 5
If the contact is not made, the insulating plate 6 having the simple shape shown in FIG. 2 can be obtained, and the parts used can be simplified and the cost can be reduced.

The electric double layer capacitor 1 shown in FIG.
Then, since the cylindrical portion of the insulating case 9 shown in FIG. 4 can be omitted, the size of the product can be reduced.

[0021]

The electric double layer capacitor element of the present invention is
The outer peripheral edge of all the current collectors has a structure that does not appear on the outer surface of the electric double layer capacitor element, and thus has a structure insulated from the inner surface of the metal case. As described above, there is no need to interpose an insulating case so that the outer peripheral edge of the current collector does not contact the inner surface of the metal case.

As a result, in the electric double layer capacitor using the electric double layer capacitor element of the present invention, even if the inner surface of the metal case and the outer surface of the electric double layer capacitor element are in contact with each other, there is no short circuit. Can be released, and it is sufficient if one lead terminal and the other lead terminal do not come into contact with each other, so that an insulating plate having a simple shape can be obtained, and the parts used can be simplified.

Further, in the electric double layer capacitor using the electric double layer capacitor element of the present invention, since the cylindrical portion of the insulating case can be omitted, the size of the product can be reduced.

[Brief description of the drawings]

1A and 1B show an electric double layer capacitor element according to an embodiment of the present invention, wherein FIG. 1A is a cross-sectional view of the electric double layer capacitor element, and FIG. 1B constitutes the electric double layer capacitor element shown in FIG. It is sectional drawing of an electric double layer capacitor cell.

FIG. 2 is a sectional view of an electric double layer capacitor using the electric double layer capacitor element shown in FIG.

FIG. 3 shows an example of a conventional electric double layer capacitor element, in which (a) is a sectional view of the electric double layer capacitor element,
(B) is a sectional view of an electric double layer capacitor cell constituting the electric double layer capacitor element shown in (a).

4 is a sectional view of an electric double layer capacitor using the electric double layer capacitor element shown in FIG.

FIG. 5 is a cross-sectional view showing another example of a conventional electric double layer capacitor element.

[Explanation of symbols]

 Reference Signs List 1 electric double layer capacitor 2 electric double layer capacitor element (element) 3 electric double layer capacitor cell (basic cell) 31 gasket 32 current collector 32a outer peripheral edge 33 electrode 34 separator 4 plate lead terminal 5 plate lead terminal 6 insulating plate 7 Cylindrical metal case with bottom (metal case) 8 Insulation sleeve 9 Cylindrical insulating case with bottom (insulation case)

Claims (1)

[Claims] 1. An electric double-layer capacitor element comprising a plurality of electric double-layer capacitor cells stacked, wherein the outer peripheral edge of all conductive current collectors of the plurality of electric double-layer capacitor cells is the electric double-layer capacitor. By being disposed inside the outer surface of the capacitor element, the outer peripheral edges of all the current collectors of the plurality of electric double layer capacitor cells do not appear on the outer surface of the electric double layer capacitor element, An electric double layer capacitor element having a structure for preventing contact and short circuit between an inner side surface of a cylindrical metal case and an outer peripheral edge of all current collectors of the electric double layer capacitor cell.