JPH0419793Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an exterior case used when accommodating a coin-shaped capacitor cell to construct an electric double layer capacitor having a predetermined withstand voltage.

[Conventional example]

Generally, this type of exterior case consists of a bottomed cylindrical body made of iron, for example, and a predetermined number of coin-shaped capacitor cells are housed inside the case, and the opening is provided between an inner electrode plate and an outer electrode plate. A sealing body with an electrically insulating plate interposed therein is placed, and then its opening edge is caulked inward to establish electrical continuity between the outer case and the outer electrode plate, and the sealing body is then caulked inward. is fixed.

By the way, when caulking the opening edge of the exterior case, conventionally, as shown in FIG.
A character-shaped step 2 is formed, and the opening edge 1a is made thin to facilitate caulking.

[Problem that the invention attempts to solve]

The above-mentioned exterior case 1 is made by drawing an iron plate of a predetermined thickness, but before being used in the assembly process of the electric double layer capacitor, for example, tin plating under the copper or solder plating under the copper is applied to obtain good conductivity. Processing is done. This plating process is usually performed by stacking a large number of exterior cases 1 in a basket and immersing them in a plating tank.
As shown in FIG. 4, the inside of the outer case 1 located on the upper side is cut out by the stepped part 2 having an L-shaped cross section and its inner diameter is enlarged. The bottom part may fit into the opening of the lower exterior case 1, and the plating liquid may not flow inside the lower exterior case 1.
It has been pointed out that products with unplated parts in this manner are susceptible to electrical failures, especially during humidity load and humidity storage tests, and even during actual use.

This idea was made to solve the above-mentioned drawbacks of the conventional case, and its purpose was to prevent the bottom of the case from fitting into the opening of another outer case even if the cases were stacked in a basket for plating. An object of the present invention is to provide an exterior case for an electric double layer capacitor whose opening is not blocked.

[Means for solving problems]

In order to achieve the above object, in this invention, a stepped portion having an L-shaped cross section is formed on the outer peripheral surface of the opening edge of the outer case, and the outer diameter of the stepped portion is substantially larger than the outer diameter of other parts. I'm trying to make it smaller.

[Effect]

As mentioned above, by forming the stepped portion having an L-shaped cross section on the outer peripheral surface side of the opening edge, the inner diameter of the opening is equal to the inner diameter of the outer case, and therefore, it is possible to There is no possibility that the bottom of the upper exterior case will fit over the opening of the lower exterior case.

〔Example〕

Hereinafter, an embodiment of this invention will be described in detail with reference to FIGS. 1 and 2.

This exterior case 10 is made of a bottomed iron cylindrical body formed in a size capable of accommodating a predetermined number of coin-shaped capacitor cells (not shown). A step portion 11 having an L-shaped cross section is formed on the side. That is, by making the outer diameter of the opening edge 10a of this exterior case 10 substantially smaller than the outer diameter of the remaining side wall of the case 10, the opening edge 10
A is made thinner. Therefore, the inner diameter of the opening edge 10a of this outer case 10 is equal to the inner diameter of the same case 10, and there is no possibility that the bottom of the upper outer case will fit into the opening of the lower outer case in the plating cage. There is almost no plating, and almost uniform plating is formed over the entire surface. The above L-shaped cross section step part 1
1, for example, when drawing the exterior case 10,
They can be formed at the same time, but in some cases they can also be formed by cutting.

For reference, as shown in FIG. 2, there are, for example, three
A cell stack 12 formed by integrally stacking two coin-shaped capacitor cells 12a with a heat-shrinkable sleeve 13 is housed, and inside the opening,
A sealing body 17 with an electric insulating plate 16 interposed between the inner electrode 14 and the outer electrode 15 is placed, and then the opening edge 10a of the outer case 10 is caulked inward to form an electric double layer. The capacitor is assembled.

〔effect〕

As is clear from the above description of the embodiment, according to this invention, a stepped portion having an L-shaped cross section is formed on the outer peripheral surface side of the opening edge of the exterior case, and the opening edge is made thin. When a large number of exterior cases are placed in a basket and immersed in a plating solution, there is no risk of the bottom of another exterior case fitting into the opening of one exterior case, and a good plating process can be achieved over the entire surface of the exterior case. can be administered.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the outer case according to this invention, Fig. 2 is a sectional view of an electric double layer capacitor to which the same outer case is applied, and Fig. 3 is a cross section showing a conventional outer case. 4 are cross-sectional views showing the overlapping state of conventional exterior cases. In the figure, 10 is an exterior case, 10a is an opening edge,
Reference numeral 11 designates a stepped portion having an L-shaped cross section, 12a a coin-shaped capacitor cell, 14 an inner electrode plate, 15 an outer electrode plate, 16 an electrically insulating plate, and 17 a sealing body.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) It has a cylindrical shape with a bottom formed in a size that can accommodate a predetermined number of coin-shaped capacitor cells, and its opening edge is curled inward. In the exterior case of an electric double layer capacitor, which is caulked to the outer electrode plate of the sealing body disposed in An exterior case for an electric double layer capacitor, characterized in that the outer diameter is substantially smaller than the outer diameter of the remaining side wall of the exterior case. (2) In claim (1) for utility model registration, the stepped portion is an exterior case of an electric double layer capacitor that is formed during drawing of the exterior case.