JPH033219A - Electric double-layer capacitor - Google Patents

Abstract

PURPOSE:To improve air-tightness at a terminal lead-out part by forming a part which is in contact with an insulating case of the terminal and a cover on a rough surface and by fusing the insulating case and the terminal lead-out part of the cover to the rough surface by ultrasonic fusion. CONSTITUTION:A laminated electric double-layer capacitor element and an electrode plate are housed within an insulating case 1, a cover 9 is placed on the insulating case 1 and a protrusion 10 is engaged into a cut-out 4, and the overlapping part between the insulating case 1 and the cover 9 is fused by ultrasonic fusion while pressure is applied to the electric double-layer capacitor element externally. At this time, since a gap 21 is set to a smaller value than the thickness of a terminal 3 at the terminal lead-out part, an unneeded part melts at an area in reference to the terminal 3 to surround the periphery of the terminal 3 when forming the insulating case 1 and the gap 21 of the cover 9, and the simultaneously melted resin flows into the projecting and recessed parts on the rough surface 22 and are cured, thus completely sealing the terminal lead-out part.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to electric double layer capacitors used in electronic circuits,
More specifically, the present invention relates to the airtight structure of the terminal extraction portion of the insulating case.

<Prior Art> Figures 10 and 11 show an electric double layer capacitor as an interesting precedent example of the present invention, in which a metal plate is placed on the inner bottom of an insulating case 1 formed in the shape of a box with a bottom. Electrode plate 2
The terminals 3 are pulled out from the notch 4 in the side wall, and a plurality of electric double layer capacitor elements 5 are stacked on top of the electrode plate 2 in a laminated state, and the electrode plate is placed on the laminated electric double layer capacitor elements. The terminal 7 of 6 is pulled out from the notch 8 provided in the side wall of the insulating case 1, and the lid 9 is stacked on the electrode plate 6.
The opening of the insulating case 1 is covered, and the overlapping surfaces of the insulating case 1 and the lid 9 are adhered while the electric double layer capacitor element 5 is pressurized, thereby sealing the inside.

In the electric double layer capacitor, the electric double layer capacitor element 5 is housed under pressure in order to stabilize the characteristics, and therefore the insulating case l and the lid 9 need to be strong.

The use of adhesive may be considered as a method of bonding the insulating case 1 and the lid 9, but in order to obtain strength, the bonding area must be large.

By the way, since the electric double layer capacitor element 5 housed inside under pressure is usually impregnated with sulfuric acid as an electrolyte, acid-resistant resin materials are selected for the insulating case 1 and the lid 9 in case the sulfuric acid flows out. However, these resin materials generally cannot be bonded with adhesives, so the range of material selection is extremely narrow.

Considering the above, ultrasonic fusion is preferable as the method of bonding the insulating case 1 and the lid 9 in the electric double layer capacitor.

This is because ultrasonic fusion can be applied to any type of resin material, provides reliable airtightness with a small bonding area, and can complete bonding instantly, which is a major advantage when considering pressurized storage. be.

In the above-mentioned internally sealed electric double layer capacitor, the airtightness of the lead-out part of the terminal 3.7 is extremely important.
The structure in which the resin and the terminal 3.7 are sandwiched between the fused portion of the lid 9 has the disadvantage that the amount of adhesive between the resin and the terminal 3.7 is small (and the terminal draw-out portion cannot be sufficiently airtight).

For this reason, a method is used in which a sealing resin is injected into the base of the drawn-out portion of the terminal 3.7 that protrudes to the outside of the insulating case 1.

<Problems to be solved by the invention> However, the injection method of sealing resin has the problem of increasing costs as the resin must be prepared separately, complicating the work process, and causing defects in resin adhesion. be.

The purpose of this invention is to solve the above-mentioned problems, and to solve the above-mentioned problems, the purpose of this invention is to provide an electrical appliance that can achieve complete airtightness at the terminal extraction part by simply fusing the insulating case and the lid, thereby simplifying the process and reducing costs. Our objective is to provide double layer capacitors.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention sets the gap between the insulating case and the terminal drawer part of the lid smaller than the thickness or diameter of the terminal. The part that contacts the lid is formed into a rough surface, and the insulating case and the terminal drawer part of the lid are fused to the rough surface by ultrasonic welding.

<Function> The laminated electric double layer capacitor element and the electrode plate sandwiching it are housed in an insulating case, and the terminal of the electrode plate is pulled out to the outside of the insulating case, and the cover is placed on the insulating case, and the electric double layer capacitor element While applying pressure, the overlapping parts of the insulating case and lid are fused using ultrasonic welding.

At this time, the gap between the insulating case and the terminal drawer part of the lid is set smaller than the thickness or diameter of the terminal, so that a sufficient amount of resin can be secured during fusion, and at the same time, the fused resin can be applied to the rough edges of the terminal. It melts into the surface and its anchor effect improves the airtightness of the terminal extraction area.

<Embodiments> Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 9 of the accompanying drawings.

The basic structure of the electric double layer capacitor is the same as that of the conventional example shown in FIGS. 10 and 11, and the same reference numerals are used for the same parts instead of explanation.

As shown in FIGS. 1 to 4, the gap 21 between the terminal drawer portion of the insulating case 1 and the lid 9 is formed between the bottom of the V-shaped notch 4.8 provided on the side wall of the insulating case 1 and the bottom surface of the lid 9. Notch 4.
8 and the lower surface of a V-shaped bundle portion 10.

The height H of the gap 21 is set to be smaller than the thickness T of the child terminal 3.7, as shown in FIGS. 3(a) and 3(b).

Incidentally, when the thickness T of the terminal 3.7 is 0.3 mm, the gap H is set to be 0.25 mm.

The position corresponding to the gap 21 of the terminal 3.7 is formed on a rough surface 22, as shown in FIG.

In the case of FIGS. 5 and 6, this rough surface 22 is formed into a mesh-like slit by press molding using a mold, but the structure is not limited as long as it has fine irregularities added thereto.

Figures 7 and 8 are examples in which the terminals 3a and 7a are round terminals, and the gap H is formed to correspond to the shape of the round terminals, and is made to have a smaller diameter than the diameter of the round terminals. It is set.

In addition, as shown in FIG. 9, the gap 21 is also used for round terminals 3a and 7a.
A corresponding position is formed on the rough surface 22.

The laminated electric double layer capacitor element and the electrode plate are housed inside the insulating case 1 manufactured as described above, and the terminals 3.7 are fitted into the notches 4.8 and pulled out to the outside, and the insulating case 1
Cover the lid 9 with the lid 9, fit the protrusion 1O111 into the notch 4.8, and while applying pressure to the electric double layer capacitor element from the outside, the overlapping portions of the insulating case 1 and the lid 9 are fused by ultrasonic welding. .

At this time, in the terminal drawer part, the gap 21 is smaller than the thickness or diameter of the terminal 3.7 (as it is set), when forming the gap 21 between the insulating case 1 and the lid 9, the gap 21 is smaller than the thickness or diameter of the terminal 3.7. The excess portion melts between the terminals 3.7 and surrounds the terminal 3.7, and at the same time, the melted resin flows in accordance with the uneven shape of the rough surface 22 and hardens, completely sealing the terminal extraction portion.

In general, adhesion mechanisms include chemical bonding and bonding due to an anchor effect caused by the adhesive entering the undulations of the object and curing there.

Since the fusing of the terminal draw-out portion in the present invention produces an effect similar to the latter adhesive mechanism, a state similar to that obtained when adhesive is used can be obtained, and the terminal draw-out portion can be completely sealed.

<Effects of the Invention> As described above, according to the present invention, the gap between the insulating case and the terminal drawer portion of the lid is set to be smaller than the thickness or diameter of the terminal, and a rough surface is formed in the portion corresponding to the gap between the terminals. However, since the part between the insulating case and the lid that sandwiches the rough surface is fused to the terminal by ultrasonic welding, the terminal drawer part can be airtighted at the same time as the insulating case and the lid are fused, and sealing resin etc. can be sealed. Since there is no need to use it, the process is simplified, costs can be reduced, and the defective rate due to resin adhesion can be reduced.

In addition, since the resin is fused to the rough surface formed on the terminal, the airtightness of the terminal extraction portion is improved due to the anchor effect.

Another advantage is that once the shapes of the insulating case, lid, and terminal are determined at the time of design, no additional steps are required.

[Brief explanation of the drawing]

FIG. 1 is an exploded front view of an insulating case and lid in an electric double layer capacitor according to the present invention, FIG. 2 is a front view of the same as above,
Figures 3 (a) and (b) are explanatory diagrams showing the relationship between the terminal and the gap, Figure 4 is an exploded perspective view of the same, Figure 5 is a plan view of the terminal,
Fig. 6 is a side view of the same side, Figs. 7 and 8 are explanatory diagrams showing the relationship between the round terminal and the gap, Fig. 9 is a perspective view of the round terminal, and Fig. 9 is a perspective view of the round terminal.
The figure is an exploded perspective view of an electric double layer capacitor, and FIG. 11 is a longitudinal sectional view of the same. 1... Insulating case 2.6... Electrode plate 3.7... Terminal 5... Electric double layer capacitor element 9... Lid 21... Gap 22... Rough surface Fig. 5 Figure 7 Figure 8

Claims (1)

[Claims] Electrode plates are stacked on both ends of multiple stacked electric double layer capacitor elements, the opening of the insulating case containing them is sealed with a lid, and the terminals of the electrode plates are pulled out from between the insulating case and the lid to the outside of the insulating case. In electric double layer capacitors,
The gap between the insulating case and the terminal drawer part of the lid is set to be smaller than the thickness or diameter of the terminal, the part of the terminal that contacts the insulating case and the cover is formed with a rough surface, and the terminal drawer part of the insulating case and the cover is treated with ultrasonic waves. An electric double layer capacitor characterized by being fused to a rough surface by fusion.