JPH0897093A - Electric double layer capacitor - Google Patents

Abstract

(57) [Abstract] [Purpose] An electric double layer capacitor with excellent electrical characteristics, which prevents the pair of polarizable electrodes from short-circuiting even if the separator is left to stand at a high temperature of 160 ° C or higher for several minutes. The purpose is to provide. A pair of polarizable electrodes 11a and 11b, a separator 12 interposed between the pair of polarizable electrodes 11a and 11b, and an electrolysis impregnated in the separator 12 and the pair of polarizable electrodes 11a and 11b. Nylon, which has a liquid, a pair of polarizable electrodes 11a and 11b, a metal case 13 that houses the separator 12, and a sealing body 14 that seals the metal case 13, and is a material with high heat resistance for the separator 12 No. 46 or polymethylpentene, which is a microporous nonwoven fabric.

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 used in various electronic devices.

[0002]

2. Description of the Related Art A conventional electric double layer capacitor of this type has a structure as shown in FIG. That is, the pair of polarizable electrodes 1a and 1b and the pair of polarizable electrodes 1
and a pair of polarizable electrodes 1a and 1b and an electrolytic solution impregnated in the separator 2, and a pair of polarizable electrodes 1a and 1b and a dish-shaped plate. A current collecting layer 5 is provided between the metal case 3 and the metal lid 4.
a and 5b are provided, and the opening of the dish-shaped metal case 3 is sealed with the metal lid 4 via the sealing body 6. Further, as the material of the separator 2, in JP-A-63-190322, a microporous nonwoven fabric made of polyethylene or polypropylene was used.

[0003]

However, in the above-mentioned conventional electric double layer capacitor, the separator 2 is used.
When a microporous non-woven fabric made of polyethylene or polypropylene is used as the material of 1. There was something to do. As described above, the conventional electric double layer capacitor described above has a problem in that it is not very satisfactory in terms of electric characteristics.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an electric double layer capacitor having excellent electric characteristics.

[0005]

In order to achieve the above object, an electric double layer capacitor of the present invention comprises a pair of polarizable electrodes, a separator interposed between the pair of polarizable electrodes, and the separator. A material having a high heat resistance for the separator, which includes an electrolytic solution impregnated in the pair of polarizable electrodes, a metal case for housing the pair of polarizable electrodes, and a sealing body for sealing the metal case. Of nylon 46 or polymethylpentene, which is a microporous nonwoven fabric.

[0006]

According to the above construction, the separator of the electric double layer capacitor is made of a microporous nonwoven fabric made of one material selected from nylon 46 and polymethylpentene, which are materials having high heat resistance. Even if the electric double layer capacitor is left at a high temperature of 160 ° C. or higher for a few minutes, the separator does not melt, and thus the pair of polarizable electrodes are not short-circuited. A double layer capacitor is obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.
11a and 11b are made of activated carbon powder and have a diameter of 4.5 mm,
A pair of polarizable electrodes each having a columnar shape with a thickness of 1.0 mm. Nylon 4 is provided between the pair of polarizable electrodes 11a and 11b.
Separator 1 composed of a microporous nonwoven fabric composed of 6
2 is interposed. In addition, the pair of polarizable electrodes 11
A, 11b and the separator 12 are impregnated with an electrolytic solution in which 10 wt% of tetraethylammonium tetrafluoroborate is dissolved in propylene carbonate. The pair of polarizable electrodes 11a and 11b are housed in a dish-shaped metal case 13 serving as a current collector, and the opening of the dish-shaped metal case 13 is covered with a sealing body 14 to collect the current. It is hermetically sealed by a metal lid 15. and again,
Current collecting layers 16a and 16b are provided between the one polarizable electrode 11a and the metal lid 15 and between the other polarizable electrode 11b and the dish-shaped metal case 13.

Table 1 shows an example of the present invention in which a separator 12 is a microporous nonwoven fabric made of nylon 46 and a separator is a polypropylene microporous nonwoven fabric. For each of Conventional Example 1 and Conventional Example 2 in which a microporous nonwoven fabric made of polyethylene was used as a separator, an average value of initial electrical characteristics of resistance, leakage current, capacity, and residual voltage,
The average values of resistance, leakage current and capacity, which are electrical characteristics immediately after a heat resistance test at 160 ° C. in a liquid phase for 2 minutes, are shown.

[0010]

[Table 1]

As is clear from this (Table 1), in the conventional examples 1 and 2, the electrical characteristics immediately after the heat resistance test at the liquid phase of 160 ° C. for 2 minutes showed the resistance of 0Ω, the leakage current of the mA order, and the capacity. On the other hand, in the example of the present invention, the electrical characteristics immediately after the heat resistance test at the liquid phase of 160 ° C. for 2 minutes were the same as the initial electrical characteristics in the example of the present invention. Since the heat resistance is remarkably improved as compared with the conventional example, it can be used as an electric double layer capacitor having excellent electric characteristics even when left at a high temperature of 160 ° C. for a liquid phase for 2 minutes.

In the embodiment of the present invention described above, the separator 12 is made of a microporous non-woven fabric made of nylon 46 which is a material having high heat resistance. Even when the separator 12 is made of a microporous nonwoven fabric made of polymethylpentene, which is a rich material, the same effect as that of the above-described embodiment of the present invention can be obtained.

Further, although the coin type electric double layer capacitor has been described in the above embodiments of the present invention, the present invention is not limited to this coin type and the present invention can be applied to a wound type electric double layer capacitor. The embodiment of is applicable.

[0014]

As described above, the electric double layer capacitor of the present invention includes a pair of polarizable electrodes, a separator interposed between the pair of polarizable electrodes, and the separator and the pair of polarizable electrodes. Nylon 46 or polymethyl, which is a material having high heat resistance for the separator, having an impregnated electrolytic solution, a pair of polarizable electrodes, a metal case that houses the separator, and a sealing body that seals the metal case. The electric double layer capacitor 16 is composed of a microporous non-woven fabric composed of one type of penten.
Even if the separator is left at a high temperature of 0 ° C. or higher for several minutes, the separator does not melt, and thus the pair of polarizable electrodes are not short-circuited, so that an electric double layer capacitor having excellent electric characteristics can be obtained. It is extremely advantageous in practical use.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric double layer capacitor showing an embodiment of the present invention.

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

[Explanation of symbols]

 11a, 11b Pair of polarizable electrodes 12 Separator 13 Metal case 14 Sealing body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masashige Ashizaki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A pair of polarizable electrodes, a separator interposed between the pair of polarizable electrodes, an electrolytic solution impregnated in the separator and the pair of polarizable electrodes, and the pair of polarizable electrodes. A micropore made of nylon 46 or polymethylpentene, which is a material having high heat resistance for the separator, having a metal case for accommodating the separator and a sealing body for sealing the metal case. Electric Double Layer Capacitor Made of Flexible Nonwoven Fabric.