JPH05315189A - Molded-armor type electric double layer capacitor and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent a short between a lead frame and an electric double layer capacitor element which appears when molding armoring resin for a molded- armor type electric double layer capacitor. CONSTITUTION:This is a molded-armor type electric double layer capacitor which has an electric double layer capacitor element, a laminated body mady by laminating the plurality of members in series, lead frames 1a and 1b which are located on upper and lower end faces of the laminated body respectively and which are molded in the shape of nearly L and which has insulating resin 2 coated on a face opposite to a side face of the laminated body, and an armor case 5 which is coated on the entire body except parts of the lead frames under application of pressure on parts of the leads frames which are brought into contact with both end faces of the laminated body. The insulating resin of the lead frames is formed in the expanding direction of the electric double layer capacitor, so a short due to a contact between the electric double layer capacitor element and the lead frames can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold exterior electric double layer capacitor and a method for manufacturing the same, and more particularly to a method for processing a lead frame.

[0002]

2. Description of the Related Art Conventionally, as shown in the cross-sectional view of FIG. 2, a conventional molded external electric double layer capacitor of this type has a substantially L-shaped structure at both upper and lower ends of an electric double layer capacitor element 3 stacked in series. Lead-out lead frame 1 bent to the outside
A mold for molding the outer case 5 by installing a and 1b and forming a laminated body of the electric double layer capacitor element 3 through the lead frames 1a and 1b (the mold is the same as the mold of FIG. 5, so the illustration is omitted).
The outer case 5 is formed by being pressed and sandwiched by the convex portions inside and then injecting resin into the mold. A part of the lead frames 1a and 1b led out of the outer case 5 is cut and bent to be an external electrode.

[0003]

In this conventional molded exterior type electric double layer capacitor, as shown in FIG. 2, the electric double layer capacitor element 3 is composed of a laminated body of conductive rubber 3a and non-conductive rubber 3b. Because it has been installed, the outer case 5
When the electric double layer capacitor element 3 is housed in a mold for molding and is pressed and sandwiched in the vertical direction by the convex portion in the mold, the electric double layer capacitor element 3 bulges in the lateral direction. At this time, the lead frames 1a and 1b bent in a substantially L shape and the conductive rubber 3a exposed on the side surface of the electric double layer capacitor element 3 may electrically contact (short circuit).

On the other hand, the number of laminated electric double layer capacitor elements 3 is determined according to the required withstand voltage performance. Therefore, when the lead frames 1a and 1b and the conductive rubber 3a are electrically contacted with each other, there is a problem that a defective product having a reduced withstand voltage is formed.

Further, in the case of a chip component as shown in FIG. 2 which is particularly required to be miniaturized, the clearance between the respective components is very small, so that the defective rate due to the short circuit is high. It was also a problem.

An object of the present invention is to prevent contact and short circuit with the lead frame due to lateral bulging which occurs when the electric double layer capacitor element is pressed from the vertical direction, and also the clearance between the side surface of the element and the lead frame. Can be made smaller,
As a result, it is an object of the present invention to provide a molded external type electric double layer capacitor that can achieve miniaturization and a method for manufacturing the same.

[0007]

According to a first aspect of the present invention, there is provided a molded exterior type electric double layer capacitor comprising a laminate of a plurality of electric double layer capacitor elements laminated in series, and upper and lower end surfaces of the laminate. And a state in which pressure is applied to the lead frame formed in a substantially L shape and having a surface facing the side surface of the laminate covered with an insulating resin and the lead frames in contact with both end surfaces of the laminate. And an outer case formed by covering the entire lead frame except a part thereof.

The object can be achieved by attaching an insulating seal as an insulating resin for covering the lead frame.

Further, the method of manufacturing a molded exterior type electric double layer capacitor of the present invention comprises a step of applying and curing an insulating resin on one surface of a lead frame punched in a strip shape at two locations except for the central portion. A step of dividing a part of the lead frame on which the insulating resin is formed into a cantilever shape; a step of molding the lead frame into a substantially L shape; and a step of forming a substantially cylindrical electric double layer capacitor element laminate. And a step of disposing the surface of the upper and lower surfaces where the resin is not applied so that the surface to which the resin is applied faces the side surface of the laminated body.

[0010]

The present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a molded exterior type electric double layer capacitor of one embodiment of the present invention, and FIGS. 3 to 6 are plan views showing in order of steps for explaining a manufacturing method of one embodiment shown in FIG. It is a side view, a cross-sectional view, and a perspective view. In manufacturing the electric double layer capacitor, first, as shown in FIG. 3A, a strip-shaped lead frame 1 having a substantially circular center portion.
Insulating resin 2 such as silicone rubber is printed and applied on one surface at two places except the central portion by means of screen printing or the like.
Next, the insulating resin 2 is subjected to a treatment such as heating to be cured. After curing, a part of the lead frame 1 is cut as shown in FIG. 3B and divided into cantilever beams 1a and 1b. As shown in FIG. 4, the divided lead frames 1a and 1b are bent in a substantially L shape at the upper and lower ends of the electric double layer capacitor element 3 and are arranged so as to oppose the coated surface of the insulating resin 2. It In this state, as shown in FIG. 5, it is housed in the molding die 4, and the convex portions 4 (a), 4 (b),
4 (c) and 4 (d) press the electric double layer capacitor element 3 through the lead frames 1a and 1b.

In the electric double layer capacitor, by pressing the electric double layer capacitor element 3, the internal contact resistance is lowered and good characteristics are realized. Since the electric double layer capacitor element 3 is composed of the conductive rubber 3a and the non-conductive rubber 3b, when the electric double layer capacitor element 3 is pressed in the vertical direction as shown in FIG. Will occur.

According to the present invention, even if the electric double layer capacitor element 3 expands in the lateral direction, the lead frames 1a and 1b are formed.
Since the insulating resin 2 is applied to the surface of the electric double layer capacitor element 3, it electrically contacts (shorts) with the conductive rubber 3a of the electric double layer capacitor element 3.
There is nothing to do. Under such pressure, the molding resin is injected into the mold 4 to form the outer case 5. After the outer case 5 is formed, the lead frame led out of the outer case 5 is cut and bent to manufacture the molded outer type electric double layer capacitor shown in FIG.

The insulating resin 2 applied by printing on the lead frame 1 avoids the surface that presses the electric double layer capacitor element 3 in the vertical direction, and the conductive rubber 3 on the side surface that swells in the horizontal direction.
Needless to say, it is formed on the exposed side.

FIG. 7 is a plan view of the lead frame 1 to which the insulating seal 6 according to the second embodiment of the present invention is attached. The second embodiment also has an advantage that the insulation from the lead frame 1 is maintained like the insulating resin 2 against the lateral bulging that occurs when the electric double layer capacitor element 3 is pressed from the vertical direction. is doing. As the material of the insulating seal 6 used here, a polyamide material or the like that does not deteriorate even at the maximum operating temperature of the product is desirable.

[0015]

As described above, according to the present invention, the lead frame having the insulating resin or the insulating seal facing the exposed side of the conductive rubber on the side surface of the electric double layer capacitor element is arranged. Even if there is a lateral bulge that occurs when the multilayer capacitor element is pressed from the vertical direction,
This has the advantage that no defective product that electrically contacts (shorts) with the lead frame is generated.

Further, the clearance between the side surface of the electric double layer capacitor element and the lead frame can be reduced because it is separated by the insulating resin or the insulating seal. In other words, it also has the advantage that the product can be made smaller.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a mold exterior type electric double layer capacitor of one embodiment of the present invention.

FIG. 2 is a cross-sectional view of an example of a conventional mold exterior type electric double layer capacitor.

3A and 3B are a plan view and a partially cut plan view of a strip-shaped lead frame coated with an insulating resin used in an embodiment of the present invention.

FIG. 4 is a side view showing a step following FIG. 3 and a state in which an electric double layer capacitor element is arranged on a lead frame on which an insulating resin is formed.

FIG. 5 is a cross-sectional view showing a state of being housed in an outer case molding die in a step following that of FIG.

FIG. 6 is a perspective view of a mold exterior type electric double layer capacitor of one embodiment of the present invention.

FIG. 7 is a plan view of a lead frame to which an insulating seal is attached, which is used in the second embodiment of the present invention.

[Explanation of symbols]

 1, 1a, 1b Lead frame 2 Insulating resin 3 Electric double layer capacitor element 3a Conductive rubber 3b Non-conductive rubber 4 Mold 4a, 4b, 4c, 4d Convex part of mold 5 Exterior case 6 Insulating seal

Claims (3)

[Claims] 1. A laminated body of a plurality of electric double layer capacitor elements laminated in series, and a surface which is arranged in upper and lower end surfaces of the laminated body and which is formed into a substantially L shape and faces a side surface of the laminated body. A lead frame coated with an insulating resin, and an outer case formed by covering the entire lead frame except a part of the lead frame in a state where pressure is applied to the lead frames in contact with both end faces of the laminated body. A molded exterior type electric double layer capacitor characterized by the following. 2. The molded external type electric double layer capacitor according to claim 1, wherein the molded outer type electric double layer capacitor is an insulating seal to which an insulating resin covering the lead frame is attached. 3. An insulative resin is applied to one surface of a lead frame punched in a strip shape at two locations except for the central portion,
A step of curing, a step of dividing a part of the lead frame on which the insulating resin is formed into a cantilever shape, a step of forming the lead frame into a substantially L shape, and a substantially cylindrical electric double layer And a step of disposing the surface of the capacitor element laminated body where the resin is not applied on the upper and lower surfaces of the capacitor element laminated body facing the side surface of the laminated body. Production method.