JPH0734424B2 - Electric double layer capacitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electric double layer capacitor used in an electronic circuit,
In particular, it relates to the structure of an electric double layer capacitor element that is housed in a laminated state in an insulating case.

<Prior Art> FIGS. 8 and 9 show the structure of an electric double layer capacitor, in which a plurality of, for example, six electric double layer capacitor elements 1 are laminated, and electrode plates 2 and 3 are provided above and below them. Insulation case 4 that is stacked and stored in insulation case 4 and closed with lid plate 7
The terminals 5 and 6 are drawn out to the outside.

FIG. 10 shows an electric double layer capacitor element 1 used for the electric double layer capacitor, in which a separator 11 and a pair of polarizable electrodes 12, 12 facing each other on both sides thereof are housed in a gasket 13, and both sides of the gasket 13 are accommodated. Conductive collectors 14, 15
Is fixed in contact with the polarizable electrodes 12, 12, and the inside of the gasket 13 is sealed.

Conventionally, assembling of the electric double layer capacitor element 1 as described above is performed by using two polarizable electrodes 12 and 12 which are integrated by an adhesive agent or the like.
After the separator 11 and the separator 11 are swung into the gasket 13 to which the first current collector 14 is attached, the second current collector 15 is adhered onto the gasket 13 under reduced pressure.

By the way, if the polarizable electrodes 12, 12 and the separator 11 are of a size that can be accommodated in the accommodation hole 16 of the gasket 13, misalignment may occur due to improper transfer or vibration and shock during the assembly process, as shown in FIG. The electric double layer capacitor element 1 is stored in a closed state, and a characteristic defect occurs in the electric double layer capacitor element 1.

In order to prevent this, as shown in Fig. 12, the separator
11 is formed larger than the storage hole 16 of the gasket 13, the periphery of the separator 11 is sandwiched between the gasket 13 and the first current collector 14 in advance, and the polarizable electrode 12 in the gasket 13
A structure has been proposed that prevents the occurrence of 12 displacements.

<Problems to be Solved by the Invention> However, a gasket is completely surrounded by the separator 11.
When sandwiched between 13 and the first current collector 14, the annular space 17 formed in the lower part of the separator 11 is completely sealed, and the second current collector is formed.
Even when decompressing the inside of the gasket 13 when pasting 15,
There is a problem that the air in the space 17 cannot be sufficiently evacuated and the characteristics of the electric double layer capacitor element 1 are deteriorated.

An object of the present invention is to provide an electric double layer capacitor which can surely degas the inside of the gasket of the electric double layer capacitor element and which can constitute an electric double layer capacitor element having excellent characteristics.

<Means for Solving the Problems> In order to solve the problems as described above, the present invention has a structure in which a separator and a pair of polarizable electrodes facing each other are housed in a gasket, and the separator is surrounded by a first current collector. The electric double layer capacitor element is formed by partially sandwiching the body and one surface side of the gasket, and stretching the second current collector on the other surface side of the gasket.

<Operation> When the electric double layer capacitor element is assembled by partially sandwiching the periphery of the separator having the polarizable electrodes on both sides with the gasket and the first current collector, and adhering the second current collector under reduced pressure, the gasket is assembled. The air in the lower space of the inner separator surely escapes from the non-sandwiched portion around the separator, and the interior of the separator can be completely evacuated without displacement of the polarizable electrode.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS. 1 to 7 of the accompanying drawings.

The basic structure of the electric double layer capacitor and the electric double layer capacitor element is the same as in FIGS. 8 to 10. Therefore, the electric double layer capacitor element of the present invention will be described by using the same reference numerals for the same portions. .

As shown in FIG. 7, the electric double layer capacitor element 1 includes a separator 11 and a polarizable electrode 12 attached on both sides thereof with an adhesive,
12 is housed in the gasket 13, the periphery of the separator 11 is partially sandwiched by one end surface of the gasket 13 and the first current collector 14, and the second current collector 15 is attached to the other end surface of the gasket 13 under reduced pressure. The inside of the gasket 13 is hermetically sealed in a deaerated state.

Since the periphery of the separator 11 is partially sandwiched between the gasket 13 and the first current collector 14, the polarizable electrodes 12, 12 housed in the gasket 13 can be accurately positioned, and the vibration during assembly can be improved. Prevents displacement due to shock and impact.

Further, by partially sandwiching the periphery of the separator 11, the separator 11 in the gasket 13 is not sandwiched.
The spaces on both sides of the gasket 13 are electrically connected, and the air inside the gasket 13 can be reliably removed.

The drawings show different examples of the structure in which the periphery of the separator 11 is partially sandwiched. In the first example shown in FIG. 1, the peripheral surface of the storage hole 16 provided in the gasket 13 is formed in the corrugated surface 21, The periphery of the rectangular-shaped separator 11 is partially supported by the end face of the corrugated surface 21, and the recessed portion of the corrugated surface 21 is opened to form an air vent portion 22.

In the second example shown in FIG. 2, the storage hole 16 of the gasket 13 is formed as a circular hole, and the rectangular separator 11 is supported by the end surface, thereby forming the air vent portions 22 at four locations on the periphery.

In a third example shown in FIG. 3, the storage hole 16 of the gasket 13 is formed in a dodecagonal rectangular shape, and each corner portion of the rectangular separator 11 is supported by the end surface of the storage hole 16 to form a storage hole.
An air vent portion 22 is formed by the inner peripheral recessed portion of 16.

In addition, in each of the first to third examples, it is also effective if the shapes of the storage hole 16 and the separator 11 are installed in opposite patterns.

In the fourth example shown in FIG. 4, the storage hole 16 of the gasket 13 and the separator 11 are both rectangular, and the length A of one side of the separator 11 is 0.3 to 1.0 mm greater than the length B of one side of the storage hole 16. It is set to a large level.

In this fourth example, as shown in FIG. 5, when the separator 11 is placed on the gasket 13, the periphery of the separator 11 is supported by the gasket 13, but as shown in FIG. When bonded together, the polarizable electrodes 12, 12 and the separator 11 are pushed into the gasket 13 and the separator 11 bends, and the amount of drawing of the separator 11 due to this bending differs in the surroundings,
Since the retracted amount is small in the corner portion and large in the intermediate portion, the peripheral intermediate portion of the separator 11 is released from being sandwiched, and the separator 11 is partially sandwiched to form an air vent portion.

In order to assemble the electric double layer capacitor element in each of the above examples, the separator 11 having the polarizable electrodes 12 and 12 adhered on both sides is placed on one side of the gasket 13 to form the polarizable electrode 12.
The first current collector 14 is overlapped and pressed from above, and the periphery of the separator 11 is partially sandwiched between the gasket 13 and the first current collector 14 and fixed by adhesion.

Next, the second current collector 15 is attached to the other surface side of the gasket 13 under reduced pressure, and the polarizable electrodes 12, 12 are enclosed in the gasket 13.

At this time, since the periphery of the separator 11 is partially sandwiched between the gasket 13 and the first current collector 14, no positional deviation occurs during encapsulation, and the separator 11 is generated between the first current collector 14 and the separator 11. The annular space 17 communicates with the air vent portion 22 formed by the non-sandwiched portion around the separator 11,
The air in the space 17 will be sufficiently removed.

Therefore, when the second current collector 15 is attached, the inside of the gasket can be completely degassed, and the electric double layer capacitor element 1
The characteristics of can be improved.

In the above embodiment, the outer shape of the electric double layer capacitor element is shown as a square shape, but it may be a circular shape.

<Effect> As described above, according to the present invention, the periphery of the separator having the polarizable electrodes adhered on both sides is partially sandwiched between the gasket and the first current collector, and the second current collector is attached to the gasket. Since the electric double layer capacitor element formed and formed was used,
When the second current collector is attached under reduced pressure, the inside of the gasket can be completely degassed, and the characteristics of the electric double layer capacitor element can be significantly improved.

Further, since the periphery of the separator is partially sandwiched between the gasket and the first current collector, the polarizable electrode can be enclosed in the gasket while being positioned and held, and the polarizable electrode can be subjected to vibration or shock during the assembly process. There is no displacement of.

[Brief description of drawings]

1 to 4 are plan views showing different examples of electric double layer capacitor elements used for the electric double layer capacitor of the present invention, and FIGS. 5 to 7 are electric double layer capacitors of FIG. FIG. 8 is a vertical sectional view showing the process of assembling the element, FIG. 8 is an exploded perspective view of the electric double layer capacitor, FIG. 9 is the same vertical sectional view, and FIGS. 10 to 12 are sectional views showing a conventional electric double layer capacitor element. It is a figure. 1 ... Electric double layer capacitor element 2, 3 ... Electrode plate, 4 ... Insulation case 5, 6 ... Terminal, 7 ... Lid plate 11 ... Separator, 12 ... Polarizable electrode 13 ... Gasket, 14 ...... First collector 15 …… Second collector, 16 …… Storing hole 17 …… Circular space, 22 …… Air vent

Claims (1)

[Claims] 1. A plurality of electric double layer capacitor elements formed by accommodating a separator and a pair of polarizable electrodes, which are adhered to and opposed to both sides of the separator, in a gasket, and a current collector is stretched on both sides of the gasket. In an electric double layer capacitor in which the separators and the pair of polarizable electrodes facing each other are housed in a gasket, and the separator is surrounded by a first current collector and one surface of the gasket. An electric double layer capacitor, characterized by using an electric double layer capacitor element formed by partially sandwiching the second side current collector on the other surface side of this gasket.