JP2000077279A - Can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the opening seal strength of a can from deteriorating, due to variation in caulking stress and improve the reliability of the opening seal. SOLUTION: This can comprises a metal case 1, having an opening and a circular columnar packing 2 mounted in the opening of the metal case 1 and has a through-hole for inserting an electrode, a guide 2b for caulking the outer peripheral edge of the metal case 1 formed on the packing 2 at an opening 2a of the metal case 1, and the outer peripheral edge of the metal case 1 is caulked inside the metal case 1 along the guide 2b while causing the packing 2 to be compressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a can body.

[0002]

2. Description of the Related Art For example, a conventional electric double-layer capacitor includes a metal case having an opening, and a cylindrical packing mounted inside the metal case and having a through hole for electrode insertion. An electric structure having a pair of rod-shaped electrodes is housed in a case, and the outer periphery and side surfaces of the metal case are compressed into the metal case while compressing the packing. The gap between the electrodes was sealed.

[0003]

In the above conventional example, there is a problem that the packing and swaging state of the metal case opening is difficult to stabilize. That is, when the metal case is swaged, the flat packing upper surface is pushed by the outer periphery of the metal case and is pushed downward, and then stopped by the side surface and the contact with the internal electric structure, and the positioning of the packing is determined. The caulking position is not constant due to the dimensional variation of the outer periphery of the metal case and the electrical structure, the fitting state of the metal case and the packing, and the timing of caulking from the side, and the caulking deformation of the metal case and the packing is caused. Due to the variation, insufficient caulking stress or local concentration occurred between the packing and the metal case and between the packing and the rod-shaped electrode, and the sealing property was gradually lost due to the erosion of the electrolytic solution. Accordingly, an object of the present invention is to suppress the deterioration of the sealing property due to the variation in the caulking stress and to improve the reliability of the sealing.

[0004]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention provides a metal case having an opening, and a cylindrical packing mounted inside the opening of the metal case and having a through hole for electrode insertion. And forming a caulking guide portion of the outer peripheral edge of the metal case on the metal case opening side of the packing, and caulking the outer peripheral edge of the metal case along the guide portion to the inside of the metal case while compressing the packing. This achieves the intended purpose.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, there is provided a metal case having an opening, and a cylindrical packing which is mounted inside the opening of the metal case and has a through hole for inserting an electrode. A caulking guide portion of the outer peripheral edge of the metal case is formed on the metal case opening side of the packing, and the outer peripheral edge of the metal case is caulked inward of the metal case along the guide portion while compressing the packing. . If the above configuration is adopted, when the outer peripheral edge of the metal case is caulked inside the metal case while compressing the packing along the caulking guide portion, the downward movement of the packing due to the outer peripheral edge of the metal case is reduced, and the caulking guide portion is provided. The convex shape of the metal case, the dimensional variation of the outer peripheral edge of the metal case and the electrical structure, the fitting state of the metal case and the packing, and the crimping guide portion without largely depending on the timing of caulking from the side. Is determined by the shape and position of the metal case, the caulking deformation of the metal case opening is made constant, the shortage and concentration of caulking stress are reduced, and the reliability of the sealing is improved.

[0006] The invention according to claim 2 of the present invention provides:
2. A caulking guide portion at an outer peripheral edge of the metal case is formed by a convex portion provided on the metal case opening side of the packing.
Wherein the caulking deformation of the outer periphery of the metal case and the packing of the metal case opening is determined by the shape and position of the protruding portion, and the caulking state is given by appropriately giving the shape and position of the protruding portion. However, it is possible to reduce insufficient stress and local concentration.

[0007] The invention described in claim 3 of the present invention provides:
2. A caulking guide portion on an outer peripheral edge of a metal case is formed by a groove-shaped portion provided on a metal case opening side of a packing.
The caulking state of the metal case outer peripheral edge of the metal case opening and the packing caulking is determined by the shape and position of the groove-shaped part, and the shape and position of the convex part are appropriately given. However, it is possible to reduce insufficient stress and local concentration.

[0008] The invention described in claim 4 of the present invention provides:
The caulking guide portion of the outer peripheral edge of the metal case is higher than the upper end of the groove portion and the groove portion provided on the metal case opening side of the packing,
2. The can body according to claim 1, wherein the can body is formed by a protruding portion located on the inner peripheral side, and since the protruding portion is higher than an upper end of the groove portion, the outer peripheral edge of the metal case is guided to the groove portion. The shape and position of the groove and the convex portion determine the caulking deformation of the outer peripheral edge of the metal case opening and the packing and the shape and position of the groove and the convex portion appropriately. In this way, the caulking state is kept constant, but the shortage of the caulking stress and the local concentration can be reduced.

According to a fifth aspect of the present invention, there is provided an electric structure having a pair of rod-like electrodes sealed in a can by a packing and a metal case.
4. The can according to any one of the items 4, wherein the reliability of the sealing of the electrical structure can be enhanced.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes an aluminum cylindrical metal case shown in FIG. 2, and an outer peripheral portion 1a is thin and easily deformed by caulking. FIG. 3 shows the inside of the opening of the metal case 1.
A rubber-made cylindrical packing 2 having a through hole 2d for electrode insertion shown in FIG. In this state, the outer periphery 1a and the side surface 1b of the outer periphery of the metal case 1 compress the packing 2 and are caulked inside the metal case 1. At this time, since the convex caulking guide portion 2b is provided in the metal case opening 2a of the packing 2, the outer peripheral edge 1a of the metal case is convex without largely pushing down the metal case opening 2a of the packing. The caulking guide portion 2b is deformed along the shape of the caulking guide portion 2b and caulked so as to sandwich the convex shape of the caulking guide portion 2b, so that a stable caulking deformation is obtained. As a result, the reliability of the sealing by the metal case 1 and the packing 2 is improved. It will be expensive. In addition,
In FIG. 1, a pair of rod-shaped electrodes 3 and an electric structure 4 as an electric double-layer capacitor are sealed in a metal case 1.

FIG. 4 shows another embodiment, in which a caulking guide portion is formed by a groove-shaped portion 2b provided on the metal case opening side of the packing to improve the stability of the caulking shape. FIG. 5 shows still another embodiment, in which a caulking guide portion on the outer peripheral edge of the metal case is provided with a groove-shaped portion 2b provided on the metal case opening side of the packing and a convex shape which is higher than the upper end of the groove portion and located on the inner peripheral side. This is formed by the portion 2c.

[0012]

As described above, according to the present invention, when the outer peripheral edge of the metal case is caulked to the inside of the metal case while compressing the packing along the caulking guide portion, the packing is moved downward by the outer peripheral edge of the metal case. And caulking to sandwich the concave shape of the caulking guide part, the dimensional variation of the outer edge of the metal case and the electrical structure, the fitting state of the metal case and the packing, and the timing of caulking from the side It is determined by the shape and position of the caulking guide portion without depending on the shape, the caulking deformation of the metal case opening is made constant, the shortage of caulking stress and local concentration are reduced, and the reliability of the sealing is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the metal case.

FIG. 3 is a sectional view of the packing;

FIG. 4 is a cross-sectional view showing another example of a caulking guide portion for packing.

FIG. 5 is a cross-sectional view showing still another example of a caulking guide portion for packing.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 metal case 1a outer peripheral edge 1b side surface 2 packing 2a metal case opening 2b caulking guide 2c caulking guide (inner peripheral side in claim 4) 2d through hole 3 rod-shaped electrode 4 electrical structure

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Ichiro Aoki 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] 1. A metal case having an opening, and a cylindrical packing mounted inside the opening of the metal case and having a through hole for inserting an electrode, wherein a metal case is provided on the metal case opening side of the packing. A can body having an outer peripheral edge caulked guide portion and the outer peripheral edge of the metal case caulked inwardly of the metal case along the guide portion while compressing the packing. 2. The can body according to claim 1, wherein the caulking guide portion on the outer peripheral edge of the metal case is formed by a convex portion provided on the metal case opening side of the packing. 3. The can body according to claim 1, wherein the caulking guide portion on the outer peripheral edge of the metal case is formed by a groove-shaped portion provided on the metal case opening side of the packing. 4. The packing according to claim 1, wherein the caulking guide portion on the outer peripheral edge of the metal case is formed by a groove provided on the metal case opening side of the packing and a convex portion higher than the upper end of the groove and located on the inner peripheral side. The can described. 5. The can according to claim 1, wherein the electric structure is housed inside the metal case.