JPH0246034Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a capacitor element made into a flat shape by winding and pressing an anode foil and a cathode foil through a separator, or a capacitor element which is made into a flat shape from the beginning. The present invention relates to a flat electrolytic capacitor in which a capacitor element wound around the capacitor element is assembled together with a sealing body in a flat case.

[Prior Art] A flat electrolytic capacitor is suitable for mounting in a narrow space, and the structure of a general flat electrolytic capacitor 1 is shown in FIGS. 9 and 10.

In this flat electrolytic capacitor 1, the capacitor element 2 is made by winding an anode foil and a cathode foil made of aluminum foil with a separator made of electrolytic paper interposed therebetween.
By pressing it into a flat shape,
Alternatively, it may consist of a roll wound in a flat shape from the beginning. The outer periphery of the capacitor element 2 is wrapped with the separator or other insulating tape, so that it is electrically insulated. The flat case 3 is a bottomed cylindrical body with an opening at one end, and is made of aluminum or the like. In such a flat case 3, the capacitor element 2 is impregnated with a required electrolyte and then assembled together with a sealing body 4 made of a rubber material. An annular drawing process 31 is applied to the sealing body portion of the case 3, and a curl process 32 is applied to the open end of the case 3 as required. Note that a concave surface 33 is formed on the flat side surface of the case 3 from the opening to the bottom.
The purpose of this concave surface 33 is to suppress swelling of the capacitor element 2 and to fix the capacitor element 2. A single groove formed in this concave surface 33 is an explosion-proof groove 34;
It may also be formed on the bottom surface 35 of the. Lead wires 21 and 22 from the capacitor element 2 are led out to the outside through through holes 41 and 42 formed in the sealing body 4.

[Problems to be solved by the invention] In such a flat electrolytic capacitor 1, although the annular drawn portion 31 is formed in the sealing body portion of the case 3, the case 3 itself is flat. Because of this, the longitudinal (long axis) direction of case 3 is A-
The sealing strength in the transversal (minor axis) direction B-B is weaker than that in A. For example, a slight gap may be created between the inner wall surface of the case 3 and the sealing body 4 due to buckling due to elastic deformation of the drawn portion 31 of the case 3, swelling of the capacitor element 2, or increase in internal pressure within the case 3. , the electrolyte inside leaks to the outside through the same gap.
For this reason, it has been difficult to extend the life of electrolytic capacitors.

[Means for solving the problem] However, in order to improve the airtightness between the inner wall surface of the case and the sealing member, the present invention includes a sealing reinforcing metal fitting for crimping and clamping the opening of the case from the outside. The present invention provides a flat electrolytic capacitor attached to an opening of a flat electrolytic capacitor.

[Example] Below, a flat electrolytic capacitor 1 according to the present invention will be described.
An embodiment of A will be described based on FIGS. 1 to 8. Prior to the description, the same reference numerals are given to the same parts as in the conventional example. As shown in FIG. 1, the structure of the flat electrolytic capacitor 1A according to the present invention is basically similar to that of the conventional flat electrolytic capacitor 1. A shaped capacitor element 2 is sealed with a sealing body 4.
In this structure, a reinforcing metal fitting 5 is attached to the opening of the case 3 to press and clamp the opening from the outside.

The shape of the sealing reinforcing metal fitting 5 is as shown in Figs. 2 to 4.
The cross section is square, U-shaped, or C-shaped as shown in the figure.
There are glyphs, etc. As shown in FIG. 5, these sealing reinforcing metal fittings 5
2, or on the outside of adjacent lead wires 21 and 22 as shown in FIG. Also,
As shown in FIG.
52, and lead wires 2 are inserted into the through holes 51 and 52.
It can also be installed so as to penetrate through 1 and 22. Furthermore, as shown in FIG. 8, the end portion 53 of the sealing reinforcing metal fitting 5 may be installed so as to be located within the drawn portion 31 of the case 3. When attaching the sealing reinforcing metal fitting 5 to the case 3, it may be welded or may be fixed using an adhesive.

[Effects] As described above, in the present invention, in a flat electrolytic capacitor in which a flat capacitor element is assembled together with a sealing member in a flat case,
Since the structure has a sealing reinforcing metal fitting attached to the opening of the case, it is possible to ensure airtightness between the inner wall surface of the case and the sealing body, and therefore there is no leakage of electrolyte. This makes it possible to provide a long-life flat electrolytic capacitor.

[Brief explanation of the drawing]

1 to 8 are diagrams for explaining the flat electrolytic capacitor according to the present invention, in which FIG. 1 is a side sectional view showing the basic structure of the flat electrolytic capacitor according to the present invention, and FIG. 2 to 4 are perspective views showing the sealing reinforcing metal fittings used in the present invention, and FIG. 5 is a front view showing the first modified embodiment.
FIG. 6 is a front view showing the second modified embodiment, FIG. 7 is a partially sectional front view showing the third modified embodiment, and FIG.
9 is a side sectional view showing the fourth modified example, FIG. 9 is an exploded perspective view showing the conventional example, and FIG. 10 is a side sectional view showing the conventional example. In the figure, 1, 1A... flat electrolytic capacitor, 2
... Capacitor element, 3 ... Case, 4 ... Sealing body, 5 ... Sealing reinforcing metal fitting.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a flat electrolytic capacitor in which a flat capacitor element is assembled together with a sealing member in a flat case, a sealing reinforcing metal fitting is attached to the opening of the case from the outside. A flat electrolytic capacitor featuring: (2) A flat electrolytic capacitor according to claim (1) for utility model registration, characterized in that the cross-sectional shape of the sealing reinforcing metal fitting is square-shaped. (3) A flat electrolytic capacitor according to claim (1) for utility model registration, characterized in that the cross-sectional shape of the sealing reinforcing metal fitting is C-shaped. (4) A flat electrolytic capacitor according to claim (1) for utility model registration, characterized in that the cross-sectional shape of the sealing reinforcing metal fitting is U-shaped. (5) Claim (1) for utility model registration is characterized in that the sealing reinforcing metal fitting is attached to the opening of the case between adjacent lead wires via the sealing body from the capacitor element. Flat electrolytic capacitor. (6) Claim (1) for utility model registration is characterized in that the sealing reinforcing metal fitting is attached to the opening of the case outside the adjacent lead wires via the sealing body from the capacitor element. Flat electrolytic capacitor. (7) In claim (1) for utility model registration, a through hole is provided in the sealing reinforcing metal fitting, and a lead wire from the capacitor element through the sealing body is passed through the through hole, and the sealing reinforcing metal fitting is attached to the opening of the case. A flat electrolytic capacitor characterized by being attached to. (8) A flat electrolytic capacitor according to claim (1) of the utility model registration, characterized in that the end of the sealing reinforcing metal fitting is located in the drawing part of the case.