JPH0412670Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a capacitor element made into a flat shape by winding an anode foil and a cathode foil through a separator and pressing them together, 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.

[Conventional technology]

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. 4 and 5.

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.
This is pressed 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. After the capacitor element 2 is impregnated with a required electrolytic solution, it is assembled into a flat case 3 together with a sealing member 4 made of a rubber or resin material. An annular drawn portion 31 is formed on the sealing body portion of the case 3, and a curled portion 32 is formed on 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. The single groove formed in this concave surface 33 is an explosion-proof groove 34, but this explosion-proof groove 34 may also be formed in the bottom surface 35 of the case 3. 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.

[Problem that the invention attempts to solve]

In such a flat electrolytic capacitor 1, an annular drawn portion 31 is formed in the sealing body portion of the case 3, but since the case 3 itself is flat, the longitudinal axis (long axis) of the case 3 is ) direction 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 backlash 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 internal electrolyte may leak out through the same gap.
For this reason, it has been difficult to extend the life of flat electrolytic capacitors.

[Means for solving problems]

The present invention was made to solve the above-mentioned conventional drawbacks, and its structural features include a flat capacitor element built into a flat case together with a sealing body, and the opening of the case reinforced with sealing from the outside. In the flat electrolytic capacitor with a metal fitting attached thereto, the sealing reinforcing metal fitting extends along a common part including a locking part that comes into contact with a longitudinal side surface of the case and a transverse side surface of the case. A pair of side parts are connected to the common part, and a notch is provided between each side part for leading out the lead wire. A side end portion is formed that slidably engages with the drawn portion.

[Effect]

According to the above configuration, the sealing reinforcing metal fitting can be attached to the case by engaging and sliding the side end portions of each side portion with the drawn portion of the case. In that case, the locking portion acts as a stopper against the side surface of the case and is positioned so that the distance from the lead wire is constant.

〔Example〕

Hereinafter, an embodiment of the flat electrolytic capacitor 1A according to this invention will be described based on FIGS. 1 to 3. 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 this invention is basically similar to the flat electrolytic capacitor 1 shown in the conventional example, in which an electrolyte is contained in a flat case 3. It has a structure in which a flat capacitor element 2 is assembled together with a sealing body 4, and a sealing reinforcing metal fitting 5 is attached to the opening of the case 3 for crimping and clamping the opening from the outside.

As shown in FIG. 2A and FIG. It has a pair of side parts 52, 52 connected to the common part 51 so as to extend along the side faces of the direction, and has a U-shape as a whole.

Lead wires 21 and 22 are connected between each side portion 52 and 52.
A notch 55 is formed for leading out.
Each side portion 52 has a side end portion 5 that slidably engages with the drawn portion 31 of the case 3.
4,54 are provided.

To attach the sealing reinforcing metal fittings 5 to the case 3, prepare two sealing reinforcing metal fittings 5 as shown in FIG. This is done by engaging and sliding the side edges 54. At this time, the locking part 53 comes into contact with the longitudinal side surface of the case 3, so further sliding is prevented and the distance between the lead wires 21, 22 and the common part 51 is kept constant. It turns out. When attaching the sealing reinforcing metal fitting 5 to the case 3, it may be welded or may be fixed using an adhesive.

〔effect〕

As described above, according to the present invention, a sealing reinforcing metal fitting can be attached to the flat case of a flat electrolytic capacitor by a simple sliding operation, even when the capacitor is mounted on a printed circuit board. This is possible, and the airtightness between the inner wall surface of the case and the sealing body can be made more reliable.

In addition, when installing the sealing reinforcing metal fitting, there is a locking part that comes into contact with the side of the case to define the installation position, so there is no need for fine adjustment and the gap between the lead wire and Effects such as being kept constant at all times are produced.

[Brief explanation of the drawing]

FIGS. 1 to 3 are diagrams for explaining the flat electrolytic capacitor according to the invention.
The figure is a side sectional view showing a flat electrolytic capacitor according to this invention, and FIGS. 2A and 2B are perspective views showing a sealing reinforcing metal fitting used in this invention, respectively.
FIG. 3 is a front view showing a flat electrolytic capacitor according to this invention, and FIG. 4 is an exploded perspective view showing a conventional example.
FIG. 5 is a side sectional view showing the conventional example. In the figure, 1 and 1A are flat electrolytic capacitors, 2 is a capacitor element, 3 is a case, 4 is a sealing body, 5 is a sealing reinforcing metal fitting, 53 is a locking part, 54 is a side end part, 5
5 is a notch.

Claims (1)

[Scope of utility model registration request] In a flat electrolytic capacitor in which a flat capacitor element is assembled together with a sealing member in a flat case, and a sealing reinforcing metal fitting is attached to the opening of the case from the outside, the sealing reinforcing metal fitting is attached to a side surface in the longitudinal direction of the case. a common part including a locking part that comes into contact with the
and a pair of side parts connected to the common part so as to extend along the lateral sides of the case, and a cutout part for leading out the lead wire is provided between each side part. A flat electrolytic capacitor characterized in that each side portion is formed with a side end portion that slidably engages with a drawn portion of the case.