JPH02305427A - Electric dual layer capacitor - Google Patents

Abstract

PURPOSE:To avoid the defective deaeration thereby enhancing the characteristics by a method wherein an expanded type supporter is provided along the inner peripheral surface of a gasket of an electric dual layer capacitor element so as to support the peripheral part of a separator by the supporter. CONSTITUTION:An expanded type supporter 26 is provided along the inner peripheral surface of a gasket 24 of an electric dual layer capacitor element 2 so as to support the peripheral part of a separator 22 by the supporter 26. That is, the peripheral part of the separator 22 is simply held by the supporter 26 overlapped with the separator 22 so that the air between the separator 22 and a lower collector 25 may be forced out of the peripheral part of the separator 22 to be perfectly deaerated for sealing by the deaeration. At this time, the diameter of the separator 22 is made larger than the inner diameter of the gasket 24 so that such a defect as shortcircuit may not be developed even if a polarizing electrode 23 extends in case of pressurization. Through these procedures, the title electric dual layer capacitor capable of perfectly deaerating the inner air while developing no defect such as shortcircuit of the polarizing electrode 23 can be manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electric double layer capacitor used in an electronic circuit, and more particularly to the structure of an electric double layer capacitor element housed in an insulating case.

<Prior art> As shown in Figures 4 and 5, electric double layer capacitors are
An electrode plate 2 made of a metal plate is placed on the bottom of the insulating case 1, and its terminals 3 protrude outside through a notch 4 on the side surface, and a plurality of electric double layer capacitor elements, for example, six electric double layer capacitor elements, are placed on the electrode plate 2. The terminals 7 of the electrode plate 6 stacked on the upper surface of the laminated electric double layer capacitor element are pulled out from the notch 8 to the outside of the insulating case 1, and the lid 9 stacked on the electrode plate 6 is inserted into the insulating case 1. The fitting portion of the lid 9 and the insulating case 1 are adhered by ultrasonic fusion or the like, and the laminated electric double layer capacitor element is housed in the insulating case 1 under pressure.

FIG. 6 shows a conventional electric double layer capacitor element 5 used in the above electric double layer capacitor, in which a separator 11
A pair of polarizable electrodes 12 and 12 are housed within the gasket 13, and both sides of the gasket 13 are housed.

A conductive current collector weight 4.14 is fixed to the surface in pressure contact with the polarizable electrodes I2, I2, and the inside of the gasket 13 is sealed.

The electric double layer capacitor element 5 described above has a polarizable electrode 12
In addition to reducing the conductive resistance of the contact surface between the current collector 14 and the current collector 14,
In order to improve the characteristics, a current collector 14.14 and a polarizable electrode 12 are stacked on both sides of the gasket 13 after internal degassing.
．． It is assembled through a step of sealing the inside of the gasket 13 while the gasket 12 is pressurized.

<Problems to be Solved by the Invention> By the way, the conventional electric double layer capacitor element 5 shown in FIG. When the polarizable electrodes 12.12 facing each other via the separator 12 expand when pressurized, the peripheries of the polarizable electrodes 12.12 will cross over the periphery of the separator 11 and come into contact with each other, resulting in a short-circuit failure with a probability of about 5 to 20%. There is a problem.

In addition, in order to prevent the occurrence of short circuit defects, an electric double layer capacitor element 5 in which the periphery of the separator 11 is sandwiched between a gasket 13 and a lower current collector 14, as shown in FIG. No. 60-182715.

This electric double layer capacitor element 5 can prevent the occurrence of short circuit failure when pressurized, but when the inside of the electric double layer capacitor element 5 is degassed and sealed, there is a gap between the separator 11 and the lower current collector 14. There is a problem in that the air in the annular space 15 generated in the process is insufficiently removed, resulting in deterioration of characteristics.

The purpose of this invention is to solve the above-mentioned problems with conventional electric double layer capacitor elements, and to eliminate short-circuiting of polarizable electrodes in electric double layer capacitor elements (and to eliminate internal degassing). The object of the present invention is to provide an electric double layer capacitor that can completely perform the following steps.

Means for Solving the Problems> In order to solve the above problems, the present invention provides a supporting portion with an enlarged diameter on the inner circumferential surface of the gasket of an electric double layer capacitor element, and this supporting portion supports the surroundings of the separator. The structure supports the following.

Since the separator is supported by simply overlapping the surrounding area on the supporting part, the air between the separator and the lower current collector is pushed open around the separator during sealing for degassing, and the air is completely degassed. λ, and the separator has a larger diameter than the inner diameter of the gasket, so even if the polarizable electrode expands when pressurized, short circuits will not occur.

<Embodiments> Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 3 of the accompanying drawings.

The basic structure of the electric double M capacitor is the same as that shown in FIGS. 4 and 5, so only the structure of the electric double layer capacitor element will be described.

As shown in FIGS. 1 to 3, the electric double layer capacitor element 2
1 houses polarizable electrodes 23.23 facing each other with a separator 22 in a gasket 24, seals both sides of the gasket 24 with current collectors 25.25, and connects the polarizable electrodes 23.23 and current collectors 25.25 to each other. Pressurized contact is made.

An enlarged-diameter support portion 26 is provided in the upper half of the inner peripheral surface of the gasket 24 by a method such as pressure molding or cutting, and supports the periphery of the separator 22 with this support portion 26 .

Therefore, the separator 22 is formed in a shape that approximately matches the maximum diameter of the support portion 26.

Each drawing shows a different example of the support part 26 provided on the gasket 24. In the first example shown in FIG. This step 27 holds the periphery of the gasket 22.

In the second example shown in FIG. 2, a support portion 26 is formed by a chamfer 28 provided on the upper half of the inner circumferential surface of the gasket 24, and the periphery of the separator 22 is supported in close contact with the chamfer 28. There is.

In the third example shown in FIG. 3, the support portion 26 is formed by a rounded surface 29 provided on the upper half of the inner peripheral surface of the gasket 24,
The periphery of the separator 22 is supported in close contact with the rounded surface 29.

On each side as described above, the periphery of the separator 22 is only supported by overlapping the support part 26, so the inside of the electric double layer capacitor element 21 is removed with the lower current collector 25 and gasket 24 bonded in advance. When the air is degassed, the annular space 3 created between the separator 22 and the lower current collector 25
0 air pushes open the surroundings of the separator 22 and escapes,
Complete deaeration will be possible.

Furthermore, since the diameter of the separator 22 almost matches the maximum diameter of the support portion 26, the diameter is larger than the inner diameter of the gasket 24, and even if the polarizable electrodes 23, 23 are expanded due to pressure, the periphery of the separator 22 is (Thus, the occurrence of short-circuit defects in the polarizable electrodes 23, 23 can be prevented.

Furthermore, it goes without saying that the electric double layer capacitor element used in the present invention may have any planar shape such as circular or prismatic.

<Effects of the Invention> As described above, according to the present invention, an enlarged-diameter support portion is provided on the inner peripheral surface of the gasket in an electric double layer capacitor element, and the periphery of the separator is supported by this support portion. The air between the lower current collector and separator can be reliably released when degassing inside the electric double layer capacitor element.
There is no occurrence of deaeration failure, and the characteristics can be improved.

Furthermore, the diameter of the separator can be increased, and the occurrence of short circuit failures when pressurizing the uni-polarizable electrode can be reliably prevented.

[Brief explanation of the drawing]

Each of FIGS. 1 to 3 is a longitudinal sectional view showing different examples of the electric double layer capacitor element used in the present invention, FIG. 4 is an exploded perspective view showing the structure of the electric double layer capacitor, and FIG. 5 is the same as above. FIGS. 6 and 7 are longitudinal sectional views showing conventional electric double layer capacitor elements.

Claims (1)

[Claims] Polarizable electrodes facing each other through a separator are housed in a gasket, both sides of the gasket are sealed with current collectors, and multiple electric double layer capacitor elements are stacked together with the polarizable electrodes and current collectors connected under pressure. , an electric double layer capacitor in which the electric double layer capacitor is housed in an insulating case is characterized in that an enlarged-diameter support portion is provided on the inner peripheral surface of the gasket of the electric double layer capacitor element, and the periphery of the separator is supported by this support portion. Electric double layer capacitor.