JPH0669079A - Electric double layer capacitor - Google Patents

Abstract

PURPOSE:To enhance the product life of the capacitor under a temperature higher than normal temperature and to enhance the volume efficiency of the capacitor by eliminating an insulating case by a method wherein the side face of a stacked body for a fundamental element is coated with a water-impermeable resin or the like and the resin is hardened. CONSTITUTION:A stacked body 4 is constituted by piling up gaskets 1 and collectors 2 as fundamental elements 3. In a state that adhesive tapes 10 have been pasted on upper surfaces of the laminated body 4, the side face of the stacked body 4 is coated with butyl rubber 9 which has been diluted by a solvent such as toluene or the like and which is highly water- impermeable, and the butyl rubber is dried and hardened. Then, the adhesive tapes 10 are removed, a metal case 8 is caulked and pressurized via a cathode lead terminal 5, an anode lead terminal 6 and a plastic insulating plate 7, and the capacitor is completed. Terminal extraction electrodes composed of a metal plate are attached temporarily to the outside of the collectors 2 at the end part of the stacked body 4 for the fundamental elements, the whole part excluding the extraction electrodes is coated with the butyl rubber, and the butyl rubber is hardened. Thereby, the insulating property of the capacitor can be enhanced and the variety of its assembly can be achieved. Since the surface of the stacked body for the fundamental elements is impregnated with the butyl rubber, a silicone resin or the like whose water-impermeability is excellent in this manner, the product life of the capacitor at normal temperature or higher can be improved.

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 more particularly to the structure of a laminated body of basic elements.

[0002]

2. Description of the Related Art A conventional electric double layer capacitor is shown in FIG.
As shown in (a), a plurality of basic elements 3 are stacked in series, pressure is applied to the basic element 3 via the negative / anode lead terminals 5, 6 and the insulating case 7, and the metal case 8 holds the applied pressure. It has a structure that

Here, the insulating case 7 maintains the insulating property between the negative / anode lead terminals 5 and 6.

As shown in FIG. 3B, the basic element 3
The current collector and the gasket 1 are made of a conductive rubber and a non-conductive rubber, respectively, and seal the inclusions such as the activated carbon electrode and the electrolytic solution by utilizing the vulcanization action of the rubber.

[0005]

As a weak point of this conventional electric double layer capacitor, when the ambient temperature during use rises from room temperature, the capacity decreases and the product life becomes short.

One of the reasons for this is that the water content of the electrolytic solution in the activated carbon electrode is dissipated.

Another problem is that because of the laminated structure, the electrodes are exposed on the side surface, and an insulating case for insulating the metal case is required, which lowers the volumetric efficiency.

An object of the present invention is to provide an electric double layer capacitor which has improved product life at a temperature higher than room temperature and which does not require installation of an internal insulating case and has improved volume efficiency.

[0009]

In the electric double layer capacitor of the present invention, a negative and positive activated carbon electrode impregnated with an electrolytic solution and divided into two by a porous separator is used as a gasket made of a non-conductive rubber and a conductive material. In the structure in which the basic element, which is sealed by utilizing the vulcanizing action with the current collector made of rubber, is laminated in an electrically series state, the side surface of the laminated body of the basic element is It is characterized in that a water-impermeable rubber or resin is applied and cured.

In addition, after the terminal extraction electrodes are temporarily attached to a part of both ends of the laminated body of the basic element, butyl rubber diluted with a solvent or the like is applied to a portion excluding the extraction electrode portions and cured. Characterize.

[0011]

The present invention will be described below with reference to the drawings. FIG. 1 is a front view of the electric double layer capacitor according to an embodiment of the present invention during manufacture and a sectional view of a completed product. 1 in the figure
Is a gasket of 0.5 mm to 2.0 mm, 2 is 0.05
It is a current collector of mm to 0.5 mm, and the activated carbon electrode inside is sealed by a known means.

The basic element 3 in which these are combined is stacked,
The laminated body 4 is configured. 10 is an adhesive tape. In this state, butyl rubber 9 having high water impermeability diluted with a solvent such as toluene is applied to the side surface. Then, it is dried and cured.

Thereafter, the adhesive tape 10 is removed, and the metal case 8 is caulked and pressed by a known means through the negative / anode lead terminals 5 and 6 and the insulating plate 7 made of plastic, as shown in FIG. 1 (b). A complete electric double layer capacitor can be obtained.

FIG. 2 is a front view of a laminated body in the process of manufacturing an electric double layer capacitor according to another embodiment of the present invention.

A terminal lead-out electrode 11 made of a metal plate having a thickness of 0.1 to 0.5 mm is temporarily attached to the outside of the current collector 2 at the end of the laminated body of the basic element, and then the lead-out electrode is formed. Butyl rubber is applied and cured on the whole except the same as in the first embodiment. With such a structure, it is possible to improve the insulating property of the laminate and to expect the versatility of assembly.

Even if a silicone resin is used instead of the burch rubber, the same effect as that of butyl rubber can be obtained.

[0017]

As described above, according to the present invention, since the surface of the laminated body of the basic element is impregnated with the burch rubber and the silicone resin which are excellent in the impermeability of water, the product life at a temperature higher than the normal temperature In addition to being excellent in the improvement effect of (3), there is an effect that the installation of an internal insulating case is unnecessary and the volume effect can be improved.

[Brief description of drawings]

FIG. 1 is a front view of a laminate and a cross-sectional view of a finished product in the process of being manufactured according to an embodiment of the present invention.

FIG. 2 is a front view of a laminate in the process of being manufactured according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view of an example of a conventional electric double layer capacitor and a front view of a basic element.

[Explanation of symbols]

 1 Gasket 2 Current Collector 3 Basic Element 4 Basic Element Stack 5 Cathode Lead Terminal 6 Anode Lead Terminal 7 Insulation Plate 7l Insulation Case 8 Metal Case 9 Butyl Rubber 10 Adhesive Tape 11 Terminal Extraction Electrode

Claims (2)

[Claims] 1. A vulcanization function is used for a negative and positive activated carbon electrode, which is impregnated with an electrolytic solution and is divided into two by a porous separator, by a gasket made of non-conductive rubber and a current collector made of conductive rubber. In an electric double-layer capacitor in which basic elements having a structure formed by sealing are laminated electrically in series, at least the side surface of the laminated body of the basic elements is impermeable to water such as butyl rubber diluted with a solvent. An electric double layer capacitor characterized by applying and curing a conductive rubber or resin. 2. A terminal lead-out electrode is temporarily attached to a part of both ends of the laminated body of the basic element, and then the whole except the lead-out electrode,
2. The electric double layer capacitor according to claim 1, wherein the water impermeable rubber or resin such as butyl rubber is applied.