JPH0751791Y2 - 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 shows an electric double layer capacitor element (hereinafter referred to as element)
FIG. In FIG. 5, 9 is an electrically conductive and ion-impermeable conductive separator, 11 is a carbon paste electrode composed of powdered activated carbon and an electrolyte solution, and 12 is an ion provided to prevent conduction between the carbon paste electrodes. A porous separator that is permeable and has non-electroconductive properties, and 10 is a non-conductive gasket that is provided to hold the carbon paste electrode and 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 stack in which elements 6 are stacked, 4
Reference numerals 5 and 5 denote a first electrode plate and a second electrode plate respectively having lead terminal portions 4a and 5a, 2 a holding body having a band portion 2a for pressurizing and holding the element laminated body, 3 a first and a second electrode plate. An insulating layer 1 for insulating the second electrode plate and the holding part is an epoxy resin for the exterior. The conventional electric double layer, after pressing and holding the element laminate 6a with the holding body 2, is immersed in a solution of epoxy resin in order to prevent an electrical short circuit on the side surface of the element laminate 6a, and then a constant temperature layer. It was heat-cured in the interior to perform exterior packaging.

[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 Problems]

In the electric double layer capacitor of the present invention, electrode plates with lead terminal portions protruding are arranged on the upper and lower surfaces of the element laminate in the laminating direction, and the element laminate and the electrode plate are U-shaped in cross section in the laminating direction. In an electric double layer capacitor having a structure in which pressure is applied to and held by a sandwiched body which is processed into a plate, and the periphery is covered with an insulating resin, one of the electrode plates and the sandwiched body are processed as an integrated plate, In addition, an electrical insulating layer is provided between the inner surface of the sandwiching body and the outer peripheral surface of the element stack, and between the inner surface of the sandwiching body and the other of the electrode plates.

〔Example〕

Next, the present invention will be described with reference to the drawings. 1A is a top view, FIG. 1B is a front view, FIG. 1C is a bottom view, FIG. 1D is a sectional view taken along line AA, and FIG. (A) of the first embodiment of the present invention is a top view,
(B) is a front view and (c) is a bottom view.

In FIGS. 1 and 2, first, six elements 6 having an outer diameter of 7 mm and a thickness of 0.5 mm are laminated to obtain an element laminated body 6a. Element stack
6a has a width of 8 mm with a lead terminal portion 2b having a width of 0.5 mm, a thickness of 0.4 mm and a length of 20 mm, and a bottom portion having a length of 10 mm and a band portion 2a having a length of 6 mm perpendicular to the two sides facing each other. The U-shaped cross section is arranged approximately at the center of the electrode part 2c of the holding body 2 made of iron-nickel alloy with solder plating. Next, an electrode plate made of iron-nickel alloy solder-plated in a square with a side length of 8 mm having lead terminals 7a having a width of 0.5 mm, a thickness of 0.4 mm, and a length of 20 mm on the upper surface of the element laminate 6a. 7 is the width direction of the holding body 2 and the electrode plate 7
Arrange them so that they are flush with the end face of. Further, an insulating sheet 8 made of polypropylene or the like having a width of 7 mm, a thickness of 0.2 mm and a length of 12 mm is placed on the electrode plate 7 so that the holding body 2 does not come into contact with the outer peripheral surfaces of the electrode plate 7 and the element laminate 6a, and the holding body is held. Place it so that it does not protrude further. Then, 20kg / c in the vertical direction of the element stack 6a
The tip of the band portion 2a was bent inward under a pressure of m ² to obtain an electric double layer capacitor (hereinafter referred to as a semi-finished product) having a width of 10 mm, a height of 8 mm, and a thickness of 4 mm before the packaging.

Next, the semi-finished product is set in a molding die having a hollow portion having a width of 11 mm, a height of 10 mm, and a thickness of 5 mm, and an insulating resin such as PBT (polybutylene terephthalate) is injected and formed. From the above, an electric double layer capacitor according to the present invention was obtained. The hole 1a shown in Fig. 1 is a mark of a die pin for fixing a semi-finished product at the time of molding, and Fig. 1 shows a hole 1a at one point at the top and bottom in the center of the product. Insulating resin 1 at the position of part 1a
In the case of molding by the pinpoint gate method in which the injection port of (1) is provided, it is necessary to fix the product at least on the gate side in a well-balanced manner at a plurality of points outside the gate position.

FIG. 3 is a drawing for explaining the second embodiment of the present invention, which is a sectional view taken along the line AA of the front view shown in FIG. 1 (b).
The electrode plate 7 and the element stack inside the holding body 2
An insulating layer 3 made of polypropylene or the like is provided on the surface contacting the outer peripheral surface of 6a.
Is different only in that it is pre-coated. Due to the above, assembly at the time of semi-manufacturing becomes very easy, and the cost can be reduced.

[Effect of device]

100 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 individual product dimensions.
It shows in (b). As is apparent from Table 1, the electric double layer capacitor of the present invention has a small size and its variation can be reduced to about 1/4.

As described above, according to the present invention, by integrating either one of the electrode plates and the holding body, the number of parts can be reduced and the product thickness can be made thinner. This has the effect of providing an electric double layer capacitor with high accuracy and a small shape.

[Brief description of drawings]

1 (a) is a top view, FIG. 1 (b) is a front view, FIG. 1 (c) is a bottom view, and FIG. 1 (d) is a sectional view taken along line AA of the first embodiment of the electric double layer capacitor according to the present invention. FIG. 2 is a top view of the first embodiment of the present invention before exterior packaging, FIG.
(C) is a bottom view, FIG. 3 is a central transverse sectional view of the second embodiment of the present invention, FIG. 4 is a sectional view of a conventional electric double layer capacitor, and FIG. 5 is a sectional view of an electric double layer capacitor element. It is a figure. 1 ... Insulating resin, 1a ... Hole part, 2 ... Holding body, 2a ... Band part, 3 ... Insulating layer, 4 ... First electrode plate, 4a ... Lead terminal of first electrode plate Part, 5 ... second electrode plate, 5a ...
... lead terminal portion of second electrode plate, 6 ... element, 6a ... element laminated body, 7 ... electrode plate, 7a ... lead terminal portion of electrode plate, 8 ... insulating sheet, 9 ... conductivity Separator, 10 ...
… Non-conductive gasket, 11 …… Carbon paste electrode,
12 ... Porous separator.

Claims (1)

[Scope of utility model registration request] 1. An electrode plate having protruding lead terminals is arranged on the upper and lower surfaces of the element laminate of the electric double layer capacitor in the lamination direction, and the element laminate and the electrode plate are U-shaped in cross section in the lamination direction. An electric double-layer capacitor having a structure in which a sandwiched body that is plate-processed into a mold is used to pressurize and hold it, and the surroundings are covered with insulating resin, in which either one of the electrode plates and the sandwiched body are integrally machined. An electric double layer capacitor having an electrical insulating layer between the inner surface of the holding body and the outer peripheral surface of the element laminated body and between the inner surface of the holding body and the other of the electrode plates.