JPH0521273A - Electric double-layer capacitor - Google Patents

Abstract

PURPOSE:To provide an electric double-layer capacitor in which a crack or a lack is hard to be caused, in which reliability is excellent, and which can readily be manufactured. CONSTITUTION:Polarizing electrodes 53, 54 comprise solid carbonaceous bodies and are partially adhered to collectors 57, 58 on the surface thereof by insulating adhesives 59, 60, and also a part in which the polalizing electrodes 53, 54 are not adhered by the insulating adhesives 59, 60 comes into contact with the collectors 57, 58.

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 having an improved structure for accommodating polarizable electrodes.

[0002]

2 to 4 are sectional views showing a conventional electric double layer capacitor.

In the electric double layer capacitor 1 shown in FIG. 2, polarizable electrodes 3 and 4 are arranged on both sides of an electrically insulating and ion permeable separator 2. The polarizable electrodes 3 and 4 are housed in the openings of the gaskets 5 and 6, and the current collectors 7 and 8 are attached from the outside of the gaskets 5 and 6, whereby the polarizable electrodes 3 and 4 are hermetically sealed. It has been stored. In addition, in the electric double layer capacitor 1 shown in FIG.
In order to prevent the leakage of the electrolytic solution due to the capillary phenomenon, the outer peripheral portion of the separator 2 is made non-porous, and is sandwiched and adhered between the gaskets 5 and 6.

On the other hand, the electric double layer capacitor 1 shown in FIG.
In No. 1, the outer peripheral edge of the separator 12 is also sandwiched between the gaskets 15 and 16, thereby preventing leakage of the electrolytic solution. Here, the separator 1
The outer peripheral edge of 2 does not reach the outer peripheral edges of the gaskets 15 and 16.

In the electric double layer capacitor 21 shown in FIG. 4, both polarizable electrodes 23,
24 and the separator 22 are housed, and current collectors 27 and 28 are attached to both sides of the gasket 25 so as to cover the opening.

[0006]

Similar to other electronic components, there is a demand for miniaturization, particularly thinness, of electric double layer capacitors. However, in the electric double layer capacitors 1, 11 and 21 shown in FIGS. 2 to 4, each polarizable electrode is hermetically housed, but is housed in a free state in the opening of the gasket. Therefore, when the electric double layer capacitor is made thinner, the thickness of the polarizable electrode itself becomes thinner and weaker, which causes cracking or chipping due to a slight shock during manufacturing, shipping or use. was there. Therefore, there is a limit to thinning.

Further, in the electric double layer capacitor 21 shown in FIG. 4, the separator 22 is only inserted in the opening of the gasket 25, and is not held by the gasket 25. Therefore, the polarizable electrode 2 is
There is also a problem that when the electrodes 3 and 24 are displaced and come into contact with the peripheral edge of the opening of the gasket 25, the upper and lower polarizable electrodes 23 and 24 come into contact with each other to cause a short circuit.

Therefore, an object of the present invention is that even if the thickness of the polarizable electrode is reduced, cracking or chipping of the polarizable electrode is unlikely to occur, which is excellent in reliability and can be easily manufactured. To provide a simple electric double layer capacitor.

[0009]

The electric double layer capacitor according to the present invention also has a separator made of an electrically insulating and ion-permeable material, and a pair of polarizable electrodes arranged to face each other across the separator. , A current collector arranged outside each polarizable electrode, and a gasket for hermetically housing each polarizable electrode between a pair of current collectors. A feature of the present invention is that the polarizable electrode is made of a solid carbonaceous material, the surface of the polarizable electrode is partially adhered to the current collector by an insulating adhesive, and the polarizable electrode is The part that is not bonded to the insulating adhesive is in contact with the current collector.

The term "solid carbonaceous material" means a conductive member which can be handled as a solid and contains carbon. Examples of this solid carbonaceous material include those exemplified in the description of examples below.

[0011]

In the present invention, the polarizable electrode is made of a material that can be handled as a solid and is adhered to the current collector. Therefore, the polarizable electrode is fixedly arranged with respect to the current collector while being hermetically housed. Therefore, even if a shock is applied from the outside, the respective polarizable electrodes do not shift their positions, and even if the polarizable electrodes are made thin, they do not crack or chip.

Even if an insulating adhesive is used to bond the polarizable electrode to the current collector, the insulating adhesive only partially bonds the polarizable electrode to the current collector, Since the part where the polarizable electrode is not adhered to the insulating adhesive is in contact with the current collector, conduction between the polarizable electrode and the current collector can be achieved.

Further, since the polarizable electrode is adhered to the current collector, the polarizable electrode can be integrally handled in a state where the polarizable electrode is adhered to the current collector during manufacturing, thus simplifying the manufacturing process. can do.

[0014]

FIG. 1 is a sectional view showing an embodiment of the present invention. In this electric double layer capacitor 51, a separator 52 and polarizable electrodes 53 and 54 are housed in an opening 55 a of a gasket 55. Separator 52
Consists of a material which is ion-permeable and electrically insulating, for example polyolefin. The polarizable electrodes 53 and 54 arranged on both sides of the separator 52 are made of the solid carbonaceous material described above.

As the solid carbonaceous body, for example, the following carbonaceous molded body can be used. (A) A material in which carbon-based powder and glass frit are mixed, the mixture is molded, the glass frit is melted by heating, and then cooled and solidified.

(B) A mixture obtained by mixing carbon-based powder, tar or pitch, a binder and a solvent and molding the mixture.

(C) A mixture of activated carbon and a binder such as polyvinyl alcohol or polyvinylpyrrolidone.

(D) A mixed compact of carbon powder and a binder. Not limited to the carbonaceous molded article as described above, for example, a woven or non-woven fabric of activated carbon fiber is punched into a certain shape or a sheet is formed by mixing activated carbon powder with a binder and then punched. It can also be used.

Returning to FIG. 1, current collectors 57 and 58 are adhered and fixed to the outside of the polarizable electrodes 53 and 54 so as to seal the opening 55a of the gasket 55. Therefore, the polarizable electrodes 53, 54 and the separator 52 are hermetically housed in the opening 55 a of the gasket 55.

The polarizable electrodes 53 and 54 are adhered and fixed to the current collectors 57 and 58 with insulating adhesives 59 and 60. Since the adhesives 59 and 60 are insulative, the polarizable electrodes 53 and 54 are partially adhered to the current collectors 57 and 58, and the polarizable electrodes 53 and 54 are insulative.
The portions not adhered to 9,60 are collectors 57,58.
The polarizable electrodes 53 and 54 are electrically connected to the current collectors 57 and 58.

The current collectors 57, 58 have polarizable electrodes 53, 58 at the portions where the insulating adhesives 59, 60 do not exist.
The current collector 5 is bent so as to be attracted to the 54 side.
This is because the inside of the opening 55a is degassed in vacuum at the time of sealing with 7, 58.

As the insulating adhesives 59 and 60, for example, an adhesive made of polyisobutylene can be used. As can be inferred from this example, it should be pointed out that the "insulating adhesive" in the present invention includes an adhesive having a weak adhesive force, which is a so-called adhesive.

The embodiment shown in FIG. 1 has a basic structure of the conventional electric double layer capacitor 21 shown in FIG. 4, but the conventional electric double layer capacitor shown in FIGS. 2 and 3 is used. In the same manner, needless to say, similarly, by fixing each polarizable electrode to the current collector with an insulating adhesive, even if the polarizable electrode is made thin, cracking or chipping can be prevented. Therefore, the present invention does not particularly concern the method of supporting the separator and the shape of the gasket used.

[0024]

According to the present invention, the polarizable electrode is made of a solid carbonaceous material which can be treated as a solid, and is adhered to the current collector with an insulating adhesive. Therefore, even if the thickness of the polarizable electrode is reduced, since it is fixedly arranged with respect to the current collector, cracking or chipping does not occur. Therefore, it is possible to realize an electric double layer capacitor that is much more reliable and thinner than the conventional electric double layer capacitor.

Further, even if the polarizable electrode is adhered to the current collector with an insulating adhesive, the insulating adhesive only partially adheres the polarizable electrode to the current collector, and thus the insulating adhesive is used. Since the portion which is not adhered by the agent is in contact with the current collector, conduction between the polarizable electrode and the current collector is guaranteed.

Further, in the manufacturing, since the polarizable electrode is adhered to the current collector, the polarizable electrode can be handled integrally with the current collector and can be handled without fear of damaging the polarizable electrode. Therefore, the manufacturing process can be simplified.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a first example of a conventional electric double layer capacitor.

FIG. 3 is a sectional view showing a second example of a conventional electric double layer capacitor.

FIG. 4 is a sectional view showing a third example of a conventional electric double layer capacitor.

[Explanation of symbols]

 51 Electric Double Layer Capacitor 52 Separator 53, 54 Polarizing Electrode 55 Gasket 57, 58 Current Collector 59, 60 Insulating Adhesive

Claims (1)

Claim: What is claimed is: 1. A separator made of an electrically insulating and ion-permeable material, a pair of polarizable electrodes arranged to face each other across the separator, and the outside of each polarizable electrode. In the electric double layer capacitor, the polarizable electrode comprises a solid carbonaceous material, and a gasket for hermetically housing each polarizable electrode between a pair of current collectors. The polarizable electrode has a surface partially adhered to the current collector by an insulating adhesive, and the polarizable electrode is not adhered to the insulating adhesive. An electric double layer capacitor, characterized in that it is in contact with the assembly.