JPH0878291A - Electric double layer capacitor and manufacturing method thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] To achieve miniaturization of electric double layer capacitors by changing the method of insulating the outer surface of the element. [Structure] An electric double layer capacitor in which a plurality of basic cells in which an electrolytic solution is sealed by utilizing the vulcanization property of a rubber material is laminated, is provided with one current collector between two adjacent cells, and The separator has a shape in which the diameter has an intermediate value between the inner diameter and the outer diameter of the gasket, like the separator, and the outer peripheral portion of the current collector is housed inside the outer surface of the gasket.

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 and a manufacturing method thereof, and more particularly to a structure of an element and a manufacturing method for realizing the structure.

[0002]

2. Description of the Related Art A conventional electric double layer capacitor is shown in FIG.
As shown in (a) and (b), a separator 2 is provided with activated carbon electrodes 4 impregnated with an electrolytic solution at the upper and lower portions thereof, and a plurality of basic cells having current collectors 1 at both ends thereof are laminated to form a stack. ing. However, the outer diameter of the conventional current collector 1 is equal to that of the gasket 3
The outer diameter of the current collector 1 is the same as the outer diameter of the laminated cell, and the edge portion of the current collector 1 protrudes from the side surface of the laminated cell (see, for example, JP-A-4-237109 and JP-A-4-280517).

FIG. 5 shows such a laminated cell as an outer case 5.
FIG. 3 is a cross-sectional view of the element housed in FIG.

[0004]

In this conventional electric double layer capacitor, since the outer peripheral portion of the current collector penetrates to the side surface of the laminated cell, if this portion is short-circuited with the external conductive outer case, the laminated cell is formed. The series connection of each cell in is broken. In order to prevent this, the side surface of the laminated cell is insulated from the conductive outer case by an insulating plate. This is a factor that not only uses an extra material but also hinders downsizing of the outer diameter of the product.

The object of the present invention is to eliminate the drawbacks of the prior art and to eliminate the need for insulating members such as an insulating case, and to reduce the outer diameter of the product by that much. And to provide a manufacturing method thereof.

[0006]

SUMMARY OF THE INVENTION The present invention is an electric double layer capacitor in which a plurality of cells sealed with an electrolytic solution are laminated by utilizing the vulcanizing property of a rubber material. In addition to the current collector, the diameter of the current collector is intermediate between the outer diameter and the inner diameter of the gasket like the separator, and the outer circumference of the current collector is stored inside the gasket outer surface. There is.

In the method for manufacturing an electric double layer capacitor of the present invention, a flat ring-shaped non-conductive material is used on one surface of a gasket, and a disk-shaped conductive film material having a diameter equal to the outer diameter of the gasket is used. A, which is made by sticking a current collector using the above, and a device B, which is made by sticking a disk-shaped current collector having a diameter between the outer diameter and the inner diameter of the gasket on one side of the gasket,
Further, a container C in which a disc-shaped separator having a diameter between the outer diameter and the inner diameter of the gasket is attached to one surface of the gasket C
3 kinds of vessels are prepared, and the same amount of powder or solid electrodes impregnated with the electrolytic solution is filled, and the vessel A is set to the lower stage.
, And then load the vessels C and B in that order, and further load the required number of logs with the vessels B and C as a pair, and then the diameter is equal to the outer diameter of the gasket on the uppermost vessel B. It is characterized in that a current collector is attached.

[0008]

The present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an electric double layer capacitor element showing a first embodiment of the present invention. In FIG. 1, the element has a diameter of 8 mm, a powder or solid activated carbon electrode 4 having a thickness of 0.2 mm impregnated with an electrolytic solution (dilute sulfuric acid, etc.), a separator 2 having a thickness of 0.05 mm and a diameter of 6 mm, and It has a structure in which a current collector 1 between adjacent cells of the same size is sealed by a gasket 3 and a current collector 1. In addition, gasket 3
Is made of non-conductive rubber material, inner diameter 5mm, outer diameter 8mm
The thickness corresponds to the thickness of the activated carbon electrode 4, the separator 2 and the current collector 1 to be sealed. In this embodiment, the current collectors 1 between all adjacent cells that are continuously connected in series are sealed inside the element.

FIG. 2 is a schematic view of the electric cell in which the laminated cell of FIG. 1 is assembled together with the anode terminal 7, the cathode terminal 8 and the insulating plate 6 which are assembly parts into an outer case 5, and the outer case 5 is caulked to apply a predetermined pressure. It is sectional drawing which shows a multilayer capacitor. FIG.
Since the laminated cell of No. 3 is adopted, the shape of the insulating plate can be simplified and the product volume can be reduced as compared with the conventional structure of FIG. Conventionally, the outer diameter of the product was 11.5 mm, but now it is 10.0 mm.

FIG. 3 is a diagram showing a manufacturing process of the present invention, which will be described below in the order of processes. (1) Molding of element material ... A disk-shaped current collector 1a having a diameter equal to the outer diameter of the gasket 3, and a flat ring-shaped gasket 3.
A disk-shaped separator 2 having a diameter that is an intermediate value between the outer diameter and the inner diameter of the gasket 3 and a disk-shaped current collector 1b that also has a diameter that is an intermediate value between the outer diameter and the inner diameter of the gasket 3 are prepared. (2) Laminating ... Making the laminating device A with the current collector 1a on one side of the gasket 3. The separator 2 is concentrically formed on one surface of the other gasket 3 to form the laminating device B. Further, the current collector 1b is concentrically formed on one surface of the other gasket 3 to form a laminating device C. (3) Packing of activated carbon electrode: The same amount of powdered or solid activated carbon electrode 4 impregnated with the electrolytic solution is packed in the containers A, B and C. (4) Combining ... With respect to the containers A, B, and C packed with activated carbon electrodes, the container A is placed in the lower stage, and the container B is loaded and combined. Further, the container C is placed in the lower stage and the container B is loaded and combined. Each of these corresponds to one cell. (5) Stacking ... Set the set of device A and device B at the bottom, and stack the set of device C and device B for a predetermined amount. (6) Pasting current collectors ..... Current collector 1a on top of container B
Stick together. By performing a vulcanization treatment after completing the above-described assembly of the laminated cell, the laminated cell of FIG. 1 is completed.

[0011]

As described above, according to the present invention, the outer diameter of the current collector is made smaller than the outer diameter of the gasket, that is, the outer diameter of the cell, so that the outer periphery of the current collector does not penetrate to the side surface of the laminated cell. Since this is done, this portion will not short-circuit with the external conductive outer case. Therefore, it is possible to simplify the exterior parts of the product such as the conventional insulating plate, and it is possible to realize the electric double layer capacitor having a smaller outer diameter than the conventional one.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a stacked cell according to an embodiment of the present invention.

FIG. 2 is a diagram showing a state in which the laminated cell of FIG. 1 is incorporated into an outer case to form an element.

FIG. 3 is a diagram showing a manufacturing process of the laminated cell shown in FIG.

4A and 4B are cross-sectional views showing a conventional laminated cell.

FIG. 5 is a diagram showing a state in which the laminated cell of FIG. 4 is incorporated in an outer case to form an element.

[Explanation of symbols]

 1 Current Collector 2 Separator 3 Gasket 4 Activated Carbon Electrode 5 Exterior Case 6 Insulation Plate 7 Anode Terminal 8 Cathode Terminal

Claims (2)

[Claims] 1. An electric double layer capacitor in which a plurality of cells in which an electrolytic solution is sealed by utilizing the vulcanization property of a rubber material is laminated, and one current collector is provided between two adjacent cells. An electric double layer capacitor characterized in that its diameter has an intermediate value between the outer diameter and the inner diameter of the gasket like the separator so that the outer peripheral portion of the current collector does not reach the outer surface of the gasket. 2. A flat ring-shaped gasket made of a non-conductive material and a disc-shaped current collector having a diameter equal to the outer diameter of the gasket is attached to one surface of the gasket. Device A, a device B in which a disk-shaped current collector having a diameter between the outer diameter and the inner diameter of the gasket is attached to one surface of the gasket, and a gasket having a diameter of one surface is also attached to one surface of the gasket. Of three types of vessels C, which are pasted with a disk-shaped separator having an intermediate value between the outside diameter and the inside diameter, and powder or solid activated carbon obtained by impregnating these three types of vessels with an electrolytic solution. The process of filling the electrodes, and the device A after filling the activated carbon electrode is placed in the lower stage, and the device B and the device C are loaded in that order, and the devices B and C are paired and the required logarithm is further loaded on it. After that, load the container B on the uppermost stage, and the diameter is equal to the outer diameter of the gasket. And a step of attaching a current collector to the electric double layer capacitor.