JPS6237921A - Electric double layer capacitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to electric double layer capacitors.

(Prior art) Electric double layer capacitors are capacitors that utilize the accumulation of charge in the electric double layer formed at the interface between electrodes and electrolyte, and are small and can achieve large capacitance.

One dead tree IRiB of the electric double layer capacitor has a pair of polarized external capacitors 1i! as shown in FIG. Ii4.5 and
It is composed of a separator 1 interposed between both electrodes 4.5 and having ion permeability and electrical insulation properties. A polarizable electrode is an electrode that does not exchange electricity at the interface and can hold charges separated.

As a polarizable electrode, use active carbon, which is inexpensive and has a large surface area and reacts with the electrolyte.

In the electric knee multilayer capacitor shown in FIG.
Gaskets) 2 and 3 are firmly attached. 3. The polarizable electrodes 4 and 5 are housed in the A1 space defined by the insulating members 2 and 3. The polarizable electrodes 4, 3, and 5 are
For example, it may be a mixed paste of activated carbon powder and an electrolyte solution containing sulfuric acid. 4-t, the insulating members 2 and 3 are used, and the space A1 is filled with paste-like polarizable electrodes 4 and 5.

A conductive sheet 6 is pasted on the surfaces of the insulating member 2 and the polarizable electrode 4, which will become one collector electrode. A conductive note 7 serving as an electrode is pasted.Therefore, the polarizable electrodes 4, J and 5 are sealed by the conductive notes 6 and 7.In order to reduce internal resistance, each Make the constituent materials as thin as possible.

It is desirable that the insulating member 2.3 has rubber elasticity from a functional point of view. Usually, electrically insulating rubber is used in the form of a goto sheet, which is punched out into the shape of the insulating member at the end of the manufacturing process.

(Problems to be solved by the invention) In order to make the electric double layer capacitor thinner (lower in height),
It is necessary to make the insulating materials 2 and 3 thinner. However, it is difficult to produce a sheet that is thin and has excellent thickness stability.

In addition, in the structure shown in FIG. 2, since the two insulating rubber notebooks 2 and 3 are pasted together with the separator I in between, the material is different. 1 cost is high. , soil, and pasting processes are required.

In Japanese Unexamined Patent Publication No. 59-3915, the insulating part ftA
Panogin is used instead of '2.3, and a metal case is used instead of conductive notebook 6.7 to enclose it like a battery. Also, JP-A-60-50914
In the publication, the insulating parts (42, 3) are omitted, and the conductive sheet 6.7 is sealed with the separator 1 interposed therebetween.

The object of the present invention is to provide a thin electric double layer = 1 density →].

(Means for Solving the Problems) The electric double layer capacitor according to the present invention includes a pair of polarizable electrodes impregnated with an electrolyte, an ion permeability of H and interposed between the pair of polarizable electrodes. It consists of an electrically insulating separator, a pair of current collectors arranged in contact with the outer surface of each polarizable electrode, and an insulating member interposed between the image aggregates at the peripheral end of the bipolarizable electrode. The polarizable electrode is hermetically sealed by adhering the negative side of the insulating member to the negative current collector through the separator and the bottom surface to the other current collector. Features.

(Function) The electric double layer capacitor can be sealed by using a single insulating member CI''. This allows the electric double layer capacitor to be made thinner.

(Example) The present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 schematically shows a cross section of an electric double layer capacitor according to an embodiment of the present invention. This capacitor is manufactured as follows.

First, attach the polarizable electrode 12°13 to the insulating rubber saw 1-11.
The thickness of the rubber sheet 11 is set to be substantially equal to the combined thickness of the two polarizable electrodes 12 and 13.Instead of the rubber sheet, an insulating Resin or the like may also be used.

Next, a separator 14 having electrical insulation and ion permeability is glued to one side of the rubber sort 11. The separator 14 may be made of, for example, a nonwoven fabric made of polyolefin such as polyethylene or polypropylene, or made of paper such as kraft paper or Manila paper using cellulose. Seha L/-Yu 14, as shown in Figure 1,
It is extruded and deformed downward to about 1/2 the depth of the hole 11a.

Next, the separator 14 is impregnated with an electrolyte.

Next, a polarizable electrode 12.13 impregnated with electrolyte is inserted into the hole 11.
It is placed on the upper and lower surfaces of the separator 14 within the space a, and further sandwiched between current collectors 15 and 16 from the outside. Then, the outer periphery of the upper current collector 15 is adhered to the outer periphery of the separator 14, and the outer periphery of the lower current collector 16 is adhered to the rubber sheet 11. The above treatments are usually performed under reduced pressure. In this way, the polarizable electrode 12.13 is brought into close contact with the separator] 4 and the current collector 15.16, and the polarizable electrode 12.1
3 is, for example, a mixture of activated carbon powder and emulsion. The current collectors 15 and 16 are selected from conductive rubber, resin, metal, etc., depending on the electrolyte.

Finally, by punching out the rubber notebook 11 into a single cell, an electric double layer capacitor →J- with a one-to-two structure as shown in Fig. 1 is obtained.
reactor.

In addition, in the manufacture of electric multi-layer capacitors, a patent application filed in 1986
Use the method disclosed in No. 0-85350,
Manufacture can be carried out efficiently, J-<.

Furthermore, the present invention can be applied to thinning devices such as batteries, batteries, etc.

(Effects of the invention) Since only one insulating sheet is used, it is possible to reduce the height of the electric multilayer capacitor. Moreover, material costs can be reduced.

Furthermore, since there are fewer adhesive points and gaps, the process is simplified,
Manufacturing costs will fall.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of an electric double layer capacitor according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a conventional electric double layer capacitor. 11 Separator, 12.13 Polarizable electrode.

Claims (1)

[Claims] (1) A pair of polarizable electrodes impregnated with an electrolyte, an electrically insulating separator that has ion permeability and is interposed between the pair of polarizable electrodes, and an outer surface of each polarizable electrode. It consists of a pair of current collectors arranged in contact with each other, and an insulating member interposed between the two current collectors at the peripheral end of a bipolarizable electrode, and the upper surface of the insulating member is connected to one current collector through a separator. An electric double layer capacitor characterized in that a polarizable electrode is hermetically sealed by adhering the polarizable electrode to the other current collector and adhering the lower surface to the other current collector.