JPH0810947Y2 - Electric double layer capacitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an electric double layer capacitor, and more particularly to an exterior structure of the electric double layer capacitor.

[Conventional technology]

As one of means for obtaining a large-capacity capacitor using an electric double layer capacitor, as disclosed in U.S. Pat. No. 3,536,963, carbon powder and an electrolytic solution are contacted to each other to form an electric double layer. There is one that utilizes the generation of.

FIG. 5 is a sectional view of an electric double layer capacitor element (hereinafter referred to as an element). In FIG. 5, 13 is an electrically conductive and ion-impermeable conductive separator, 15 is a carbon paste electrode composed of powdered activated carbon and an electrolyte solution, and 16 is an ion provided to prevent conduction between the carbon paste electrodes. A porous separator that is permeable and has non-electron conductivity, and 14 is a non-conductive gasket provided to hold the carbon paste electrode and to shield it from the outside.

FIG. 4 is a sectional view of a conventional electric double layer capacitor. In FIG. 4, 6a is an element laminated body in which elements 6 are laminated, 4 and 5 are a first electrode plate having lead terminal portions 4a and 5a, respectively, and a second electrode plate 2 is a pressure applied to the element laminated body. -Holder having band portion 2a for holding, 3 is first
And an insulating layer for insulating the second electrode plate and the sandwiching part, 1
Is an epoxy resin for the exterior. The conventional electric double layer pressurizes and holds the element laminated body 6a by the sandwiching portion 2, and then permeates it into the epoxy resin solution to prevent an electrical short circuit on the side surface of the element laminated body 6a, and then the isothermal It was heat-cured in the tank to be exteriorized.

[Problems to be solved by the device]

The above-mentioned conventional electric double-layer capacitor is heat-cured after being dipped in a solution of epoxy resin at the time of resin coating. Therefore, when the amount of the attached resin increases, the external dimensions increase and the dimension There was a problem that the variation became large.

[Means for solving the problem]

In the electric double layer capacitor of the present invention, the electrode plates with the lead terminal portions protruding are arranged above and below the element laminated body, and the element laminated body and the electrode plate described above are plate-shaped in a U-shaped cross section. In an electric double-layer capacitor that has a structure in which it is pressed and held by a sandwiching body that has an electrically insulating layer on its inner surface and is covered with an insulating resin, insulation is performed with part of the sandwiching body exposed. It is characterized by being covered with resin.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a perspective view of an embodiment of the present invention, and FIG. 3 (a) is a mold of a resin extrusion molding machine according to the present invention before exterior packaging. FIG. 3 (b) is a perspective view of an embodiment of the present invention immediately after the electric double layer capacitor is set, and FIG.

1 and 3, the outer diameter is 7mm and the thickness is 0.5mm.
The element 6 of 6 is laminated to obtain an element laminated body 6a. Next, the upper and lower surfaces of the element stack 6a have lead terminal portions 4a and 5a each having a width of 1.0 mm, a thickness of 0.2 mm, and a length of 10 mm, and the length of one side is 8 mm.
The square first electrode plate 4 and second electrode plate 5 made of stainless steel are placed, and then the inner surface is provided with the insulating layer 3 made of vinyl chloride with a thickness of 0.2 mm, and the bottom side is a square of 9 mm. Band 2a 2mm wide and 4mm long at a right angle from the two sides facing each other
It is housed in a stainless steel sandwich 2 having a U-shaped cross section, and the tip of the band 2a is bent inward with a pressure of 20 kg / cm ² applied vertically to the element stack, 9 mm wide and 9 m wide
An electric double layer capacitor 7 having a thickness of 4.5 mm and a thickness of 4.5 mm before packaging was obtained. Furthermore, it has an epoxy resin extrusion port 10 and the upper and lower molds have a hollow part of 9 mm × 9 mm × 4.5 mm when combined with the upper mold.
8, electric double layer capacitor 7 before the exterior in the hollow part of the lower mold 9
Set, set the upper and lower molds, press the epoxy resin through the extrusion port 10 and heat the epoxy resin together with the mold for 10 minutes in a temperature atmosphere of 180 ° C, and after cooling, take out the third one. Electric double layer capacitor shown in FIG.
Twelve. After that, the excess resin portion 11 was cut off to obtain an electric double layer capacitor according to the present invention.

Further, an electric double layer capacitor of a conventional example was obtained under the same manufacturing conditions as the present invention except that the resin coating was performed by the conventional method.

10 electric double layer capacitors of the embodiment of the present invention and the conventional example
Table 1 (a) shows the average value and variation of 0 product dimensions.
It shows in (b).

As is clear from Table 1, the electric double layer capacitor of the present invention has a small size and the variation can be reduced to about 1/4.

[Effects of the Invention] As described above, the present invention makes it possible to reduce the external thickness of the product by reducing the thickness of the resin at the time of packaging by exposing a part of the sandwiching body. By doing so, it is possible to obtain an effect that an electric double layer capacitor having high accuracy and a small shape can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric double layer capacitor according to the present invention,
FIG. 2 is a perspective view of an electric double layer capacitor according to the present invention,
FIG. 3 (a) is a sectional view showing a state where the electric double layer capacitor of the present invention before the exterior is set in the mold of the resin extrusion molding machine,
FIG. 3 (b) is a perspective view of the electric double layer capacitor of the present invention immediately after being taken out from the mold, FIG. 4 is a sectional view of a conventional electric double layer capacitor, and FIG. 5 is a sectional view of the electric double layer capacitor element. Fig. 1 ... epoxy resin, 2a ... band part, 2 ... holding body,
3 ... Insulating layer, 4 ... First electrode plate, 4a ... Lead terminal part of first electrode plate, 5 ... Second electrode plate, 5a ... Lead terminal part of second electrode plate, 6 ... element, 6a ... element laminated body, 7 ... electric double layer capacitor according to the present invention before insulating resin coating, 8 ... upper die for resin extrusion, 9 ... lower die for resin extrusion, 10 ... … Resin extrusion port, 11 …… Excess resin part, 12 …… Electric double layer capacitor according to the present invention immediately after being taken out from the mold, 13 …… Conductive separator, 14 …… Nonconductive gasket, 15 …… Carbon Paste electrode, 16 ……
Porous separator.

Claims (1)

[Scope of utility model registration request] 1. An electrode plate having lead terminal portions protruding is arranged on the upper and lower surfaces of an element laminate of an electric double layer capacitor, and the element laminate and the electrode plate are laminated in a laminating direction in a U-shaped cross section. In an electric double-layer capacitor that is processed, pressed and held by a sandwiching body with an electrical insulating layer on its inner surface, and that is covered with insulating resin, insulation is performed with part of the sandwiching body exposed. An electric double layer capacitor characterized by being covered with resin.