JPH02266508A - Electric double layer capacitor - Google Patents

Abstract

PURPOSE:To vary the size of the height of an insulating case, and to adjust the compressibility of a laminated fundamental cell freely while improving the joining strength and airtightness of the insulating case by dividing the insulating case into two case components, forming the joining sections of both cases to inclined planes and joining the cases by the fitting sections of the inclined planes. CONSTITUTION:Both case components 7a, 7b, in which laminated fundamental cells 1 are housed, are combined, and inclined planes 21, 22 formed to joining sections are fitted and fixed, thus assembling an insulating case 7. Consequently, the size of the height of the insulating case 7 can be adjusted by the fitting sections of the inclined planes 21, 22, thus freely setting the compressibility of the laminated fundamental cells 1. The joining areas of the joining sections of both case components 7a, 7b are increased by the fitting of the inclined planes, thus improving strength and air-tightness.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electric double layer capacitor, and more particularly to the structure of an insulating case that accommodates a plurality of basic cells.

<Prior Art> FIG. 7 shows a basic cell 1 used in the construction of an electric double layer capacitor, in which a pair of polarizable electrodes 3.3 with a separator 2 interposed therebetween is housed in a gasket 4.
A conductive current collector 5.5 is fixed in contact with the polarizable electrode 3.3 on both sides of the gasket 4, and the inside of the gasket 4 is sealed.

As shown in FIGS. 8 to 10, an electric double layer capacitor using the basic cell 1 described above is constructed by stacking a plurality of basic cells 1, for example, six basic cells 1, and storing this in an insulating case 7.
Terminals 8 and 9 are drawn out to the outside of the insulating case 7.

By the way, an electric double layer capacitor in which a plurality of basic cells 1 are stacked has contact resistance between the basic cells 1 and polarizable electrodes 3.
．． Since the contact resistance between the particles of activated carbon constituting 3 becomes large, it is necessary to apply appropriate pressure from above and below to hold the basic cells 1 in a stacked state.

For this reason, considering the variation in the thickness of each component used in the configuration of the basic cell, the insulating case 7 that houses the stacked basic cells
A compression ratio adjustment mechanism for basic cell 1 is required.

8 to 10 show different examples of the conventional insulating case 7, and FIGS. 8(a) and 8(b) are formed by dividing the rectangular insulating case 7 into upper and lower case constituent members 7a and 7b. This is what I did.

Further, in the example shown in FIGS. 9(a) and 9(b), the circular insulating case 7 is divided into upper and lower case constituent members 7a and 7b.

Case component member 7 in each insulating case 7 as described above
As shown in FIG. 11, the joint portions 10 of a and 7b have a structure in which both ends are formed into flat surfaces and the abutting surfaces are fixed with adhesive or the like.

The insulating case 7 shown in FIG. 10 has an opening 11 provided on the side surface.
The laminated basic cell 1 is inserted from the part shown in FIG.

<Problems to be Solved by the Invention> By the way, all of the conventional insulating cases 7 as described above have a uniform height dimension H, and it is not possible to adjust the compression ratio of the basic cells 1 housed therein. There's a problem.

Further, as shown in FIG. 11, both case constituent members 7a,
If the joint 7b has a flat butted structure, there is a problem that the joint area between the two is small (it is weak in terms of strength and lacks reliability in terms of airtightness).

An object of this invention is to solve the above-mentioned problems by making the height of the insulating case variable so that the compression ratio of the basic cell layer can be freely adjusted, and in addition, the bonding strength of the insulating case and the An object of the present invention is to provide an electric double layer capacitor with excellent airtightness.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention divides an insulating case into two case constituent members, and creates a sloped surface that fits inside and outside the joint portion of both case constituent members. The case is formed in such a manner that the height dimension of the case can be changed at the fitting portion of the inclined surface and the case can be joined.

Action〉 The insulating case is assembled by combining the two case components that house the laminated basic cells inside, and fitting and fixing the sloped surfaces formed at the joining parts. The size can be adjusted, and the compression ratio of the laminated basic cells can be freely set.

In addition, the joint area of both case constituent members is increased due to the fitting of the inclined surfaces, and the strength and airtightness are improved.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 6.

The basic structure of the electric double layer capacitor is substantially the same as that of the conventional example shown in FIG. 7 and FIG.

The first example shown in FIG.
a and 7b, and the joint portion of both case constituent members 7a and 7b is formed into an inclined surface 21, 22 that fits inside.

In the second example shown in FIG. 2, the insulating case 7 is divided into case constituent members 7a and 7b at the upper end portion, one of the case constituent members 7a serves as a lid, and both case constituent members 7a and 7b are separated.
The joint portions are made into inclined surfaces 21 and 22.

The above-mentioned insulating case 7 is constructed by combining both case constituent members 7a and 7b with the laminated basic cell 1 stored therein, fitting the inclined surfaces 21 and 22 of the joint part, and applying ultrasonic welding to the fitted part. The parts are joined by heat fusion, adhesive, etc., and the inside is sealed.

In addition, the material used for forming the insulating case 7 is heat-resistant,
PBT, POM, PC, P due to chemical resistance, strength, and formability.
ET, PP, and S are preferred.

Both case constituent members 7a and 7b in the insulating case 7
In the case of FIGS. 3(a) and (b), the inclined surfaces 21.22 of
Both joint portions are each inclined at an angle of about 30''-60°, and are formed so as to fit inside and outside.

In this way, when the joining portions are formed on the inclined surfaces 21 and 22, the fitting conditions can be changed along the vertical direction of the insulating case 7 by utilizing the flexibility of the case constituent members 7a and 7b. 3(c) shows that the height of the insulating case 7 is set to be high by shallowly fitting the inclined surface 21 of the upper case component 7a, and FIG. 3(d) shows the inclined surface of the upper case component 7a. 21 is deeply fitted and the height H of the insulating case 7 is set low.

In this way, the height dimension H of the insulating case 7 can be changed depending on the fitting conditions of the inclined surfaces 21 and 22. Therefore, even if the thickness of the laminated basic cell 1 housed inside changes, the insulating case 7 can be This makes it possible to adjust the pressure to always apply a constant pressure to the laminated basic cell.

4 to 6 show a joining structure suitable for joining both case components 7a and 7b by ultrasonic fusion, and the example in FIG. 4 shows the opening side end of one case component 7a. an inwardly inclined wall 23 having an inclined surface 21 and an extension wall 24 that fits inside the other case component 7b;
The joint area between both case constituent members 7a and 7b is widened.

In the example shown in FIG. 5, a protruding wall 25 is connected to the tip of an inclined surface 21 formed on a case component 7a, and the protruding wall 25 is fitted inside an inclined surface 22 formed on a case component 7b on the other hand. It has a structure in which a concave stepped portion 26 is provided around the periphery.

In the example shown in FIG. 6, the inclined surface 2 of the case component 7b is
1 is made into an arc shape, and the inclined surface 22 of the other case component 7b is formed into an arc shape with a smaller radius than the above-mentioned inclined surface 21, and a stepped portion 2 for accumulating paris is formed on the tip side of this inclined surface 22.
7 is provided so that paris generated during fusion is collected in the space formed by the stepped portion 27, thereby expanding the fusion area.

In this way, the examples shown in FIGS. 4 to 6 can increase the joint area of the joint between the case constituent members 7a and 7b, and are excellent in terms of fusion strength and airtightness.

<Effects of the Invention> As described above, according to the present invention, the insulating case housing the laminated basic cell is divided into two case constituent members, and the joint portion of both case constituent members is formed into an inclined surface that fits inside and outside. As a result, the height of the insulation case can be freely changed, and even if there are variations in the material thickness of the basic cells housed inside, the compression ratio of the basic cells can be adjusted, making it practical with uniform characteristics. It is possible to obtain a high electric double layer capacitor.

Furthermore, since the joint portion is formed on an inclined surface, the contact area is increased, the airtightness of the insulating case is increased, and the strength is also improved.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing a first example of an electric double layer capacitor according to the present invention, FIG. 2 is an exploded perspective view showing a second example of the same, and FIGS. 3(a) to (d) are the same as above. Each of FIGS. 4 to 6 is an enlarged sectional view showing a different example of the above-mentioned joining portion, and FIG. 7 is an enlarged sectional view of a basic cell. Figures 8 to 10
Each of the figures is a perspective view showing a different example of a conventional electric double layer capacitor, and FIG. 11 is an enlarged sectional view of a joint portion in a conventional insulating case. 1... Basic cell 3... Polarizable electrode 7...
・Insulating case 7a, 7b...Case component members 21, 22...Slanted surface Patent attorney Kazu 1) Figure 1 Figure 2 Figure 3 (a) Figure 3 Figure 3 (b) ) (c) Figure 3 (d) Figure 9 (a) Figure 10 r6 Pn Figure 9 (b) Figure 11

Claims (1)

[Claims] In an electric double layer capacitor in which multiple basic cells are stacked and housed inside an insulating case, the insulating case is divided into two case components, and the inclined surface fits inside and outside the joint of both case components. An electric double layer capacitor characterized in that the case can be joined by changing the height dimension of the case at the fitting portion of the inclined surface.