JPH08753Y2 - Electric double layer capacitor - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to an electric double layer capacitor that prevents leakage of electrolyte.

[Prior art]

The electric double layer capacitor is known as a capacitor that has a small size but a large capacity, and is used for backup when a power source fails. FIG. 3 shows a conventional electric double layer capacitor, and FIG.
The figure shows its exploded view. In these figures, 1 is a collector, 2 is a polarizable electrode, 3 is a separator, and 4 is a gasket. A conductive sheet is used as the current collector 1, and an insulating rubber is used as the gasket 4. First, current collector 1
Two sets are prepared by filling the polarizable electrode 2 in the central recess formed by adhering the gasket 4 and the gasket 4 by vulcanization or the like.
Next, they are arranged so that the polarizable electrodes 2 face each other with the separator 3 as a boundary, and they are bonded while sandwiching the edge portion of the separator 3 with the gasket 4 portion. As the separator 3, a porous film (eg, a plastic film) having a property of transmitting ions but blocking electron conduction is used. Moreover, the gasket 4 has a function of insulating the polarizable electrode 2 from the outside. The polarizable electrode 2 is composed of activated carbon powder and an electrolytic solution (eg, dilute sulfuric acid).
It may be a paste-like polarizable electrode formed by mixing and forming a paste, or a solid polarizable electrode in which activated carbon powder is sintered or fired to be solid and then impregnated with an electrolytic solution. In addition, as a literature about the electric double layer capacitor,
For example, there is Japanese Examined Patent Publication No. 55-41015.

[Problems to be solved by the device]

However, the above-mentioned conventional electric double layer capacitor has the following problems. That is, when the respective constituent elements as shown in FIG. 4 are overlapped and vulcanized and bonded while applying pressure, the electrolytic solution impregnated in the polarizable electrode exudes to the part to be bonded, resulting in a defective bonding part. The point is that it will end up. When there is a poorly adhered part, the electrolyte leaks from there,
This will reduce the performance of the electric double layer capacitor. The present invention aims to solve the above problems.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, an electric double layer capacitor of the present invention comprises an inner gasket to which an edge of a separator is adhered and an outer gasket which is arranged outside the inner gasket with a gap. And

[Action]

Since the gasket has a double structure with a gap, and the separator is bonded to the inner gasket,
Even if the electrolytic solution impregnated in the polarizable electrode oozes out to cause adhesion failure at the adhesion portion, it is possible to keep the location on the adhesion surface between the inner gasket and the separator. In the outer gasket 4B, good adhesion is achieved without damaging the adhesive portion to the electrolytic solution, so that it is possible to prevent the electrolytic solution from leaking to the outside of the electric double layer capacitor.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an electric double layer capacitor according to an embodiment of the present invention, and FIG. 2 is an exploded view thereof. The code is the third
It corresponds to the one in the figure. And, 4A is an inner gasket, 4B is an outer gasket, and 5 is a gap. The material used for each component is the same as the conventional one. In terms of the structure, the first difference from the conventional example of FIG. 3 is that the gasket is doubled. That is, conventionally, the gasket 4
However, in the present invention, the inner gasket 4A and the outer gasket 4B are provided with a slight gap 5 between them.
The point is that it has a heavy structure. FIG. 5 shows a perspective view when two such gaskets used in the present invention are placed on a current collector. The second different point is that the gasket to which the edge of the separator 3 is adhered is the inner gasket 4A and is not adhered to the outer gasket 4B. In the present invention, since it is as described above, the outer gasket 4B
Has the same thickness as the inner gasket 4A, but has a large outer circumference, and when the inner gasket 4A is housed inside, a gap 5 is formed between the inner surface of the outer gasket 4B and the outer surface of the inner gasket 4A. The size of the separator 3 is such that the edge has an inner gasket.
The size is such that it can reach the surface of 4A (the surface of the shaded part of the inner gasket 4A in Fig. 2). The electric double layer capacitor is manufactured by stacking the respective elements shown in FIG. 2 and vulcanizing and adhering while applying pressure, thereby adhering the portions to be adhered. As a result, the electric double layer capacitor having the structure shown in FIG. 1 is completed. However, since the polarizable electrode 2 impregnated with the electrolytic solution is located inside the inner gasket 4A, even if the electrolytic solution exudes during pressurization, the adhesive surface to which the exuded electrolytic solution adheres is It is the bonding surface between 4A and the separator 3. Since the gap 5 exists between the inner gasket 4A and the outer gasket 4B, it does not reach the bonding surface between the outer gaskets 4B. Therefore, the adhesion between the outer gaskets 4B does not become defective, and the electrolytic solution does not leak out of the electric double layer capacitor. In the above example, the outer gasket 4B is divided into upper and lower parts, but they may be integrated (that is, the thickness is doubled).

[Effect of device]

As described above, in the electric double layer capacitor of the present invention, the gasket has a double structure with a gap.
The separator is attached to the inner gasket. This makes it possible to limit the location where the electrolytic solution impregnated in the polarizable electrode oozes out to cause poor adhesion on the adhesive surface between the inner gasket and the separator. Therefore, it is possible to prevent the electrolytic solution from leaking to the outside of the electric double layer capacitor.

[Brief description of drawings]

FIG. 1 ... Electric double layer capacitor according to an embodiment of the present invention FIG. 2 ... Exploded view of electric double layer capacitor shown in FIG. 3 FIG. 3 Conventional electric double layer capacitor FIG. 4 Electricity of FIG. Exploded view of double-layer capacitor FIG. 5 shows a perspective view of the gasket used in the present invention placed on a current collector. In the figure, 1 is a collector, 2 is a polarizable electrode, 3 is a separator, 4 is a gasket, 4A is an inner gasket, 4B is an outer gasket, and 5 is a gap.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Seiichi Kitoh Seiichiro Kido No.8 Tsutana, Fujisawa City, Kanagawa Prefecture Isuzu Motors Co., Ltd. Fujisawa Plant (72) Noriaki Niida No.8 Tsutana, Fujisawa City, Kanagawa Isuzu Engineering Co., Ltd. In-house (72) Creator Masanori Nakanishi, 5-16-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Kagaku Co., Ltd. (72) Inventor, Mitsuhiro Nakamura 5-36-11 Shinbashi, Minato-ku, Tokyo Fuji Electric Kagaku Co., Ltd. (56) References JP-A-2-220351 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. An electric double layer capacitor comprising an inner gasket to which an edge of a separator is adhered, and an outer gasket which is arranged outside the inner gasket with a gap therebetween.