JPS5943726Y2 - Electrolytic capacitor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to improvements in electrolytic capacitors, and in particular to improvements in the airtightness, mechanical strength, etc. of the sealing body.

As shown in FIG. 1, a conventional electrolytic capacitor includes a capacitor element 1 in which an electrode foil is wound with electrolytic paper interposed therebetween, and a capacitor element 1 is housed in a cylindrical outer case 2 with a bottom, and a sealing body 3 made of elastic rubber or the like is placed between The capacitor element 1 was sealed by being attached to the opening of the outer case 2.

Another sealing structure, as shown in FIG. 2, is one in which the sealing body 3 is made of synthetic resin and an elastic rubber ring 4 is interposed on a part of the side surface of the synthetic resin sealing body 3.

However, in electrolytic capacitors having any of the above-mentioned sealed structures, impurities in the elastic rubber precipitate due to the chemical action of the electrolyte, which significantly affects the electrical characteristics of the electrolytic capacitor.
Alternatively, due to aging of the elastic rubber, airtightness cannot be maintained, which may adversely affect the life characteristics of the electrolytic capacitor.

In addition, in an electrolytic capacitor as shown in Figure 2,
The adhesion between the outer case 2 made of aluminum or the like and the external connection lead wires 5 and 6 and the synthetic resin sealing body 3 is poor, and the airtightness is also poor.

Furthermore, elastic rubber or synthetic resin may lack mechanical strength as a sealing member, and is also vulnerable to pressure inside the capacitor.

Furthermore, recent electronic components including electrolytic capacitors are now required to have a maximum operating temperature in the range of 100℃ to 150℃, and conventional sealing structures made of elastic rubber or synthetic resin have poor heat resistance and age. There was a risk of evaporation of the electrolyte due to deterioration and an explosion due to an increase in internal pressure.

The purpose of this invention is to solve the above-mentioned drawbacks, and to provide an electrolytic capacitor that has a sealing body that undergoes little chemical change and has excellent mechanical strength and sealing accuracy.

This invention consists of an aluminum plate on which an external lead wire is erected and an insertion hole provided at a position symmetrical to the center point of the external lead wire, and at least two holes near the center.
In addition to having the above-mentioned insertion hole, the sealing body is made of an elastic insulator that covers at least the upper and lower end surfaces and side surfaces of the completed sealing body, and the elastic insulator is sandwiched between the two aluminum plates. It is characterized by connecting the lead wires derived from the capacitor element to two aluminum plates.

This invention will be explained below with reference to the drawings.

FIG. 3 is a sectional view showing the electrolytic capacitor according to this invention in a complete tc state.

FIG. 4 is an exploded perspective view illustrating the assembly structure of the sealing body of the electrolytic capacitor according to this invention.

In the figure, the external lead wire 13 is erected on a metal plate 8 made of aluminum or the like, and the metal plate 8 has a second wire connected to the external lead wire 13 in the vicinity of a position symmetrical to the center point of the external lead wire 13. An insertion hole 15 is formed in the metal plate 9, through which an external lead wire 14 is inserted.

These members are arranged in the order of the first metal plate 8, the elastic insulator 10, and the second metal plate 9 from above. The sealing body 7 is constructed by passing through the insertion hole 11 provided in the insulator 10 and forming each member integrally.

The peripheral edges of at least two insertion holes 11, 12 formed in this sharpened elastic insulator 10 protrude in opposite directions, and after forming the sealing body I, the two metal plates 8, 9
It protrudes from the end face.

Further, the elastic insulator 10 covers the peripheral surfaces and peripheral ends of the metal plates 8 and 9, and maintains insulation from the outer case 2.

On the other hand, the electrode lead wires 17.18 led out from the end face of the capacitor element 1 are electrically connected to the exposed parts of the two metal plates 8.9 on the element side by ultrasonic welding, compression, etc. ing.

The sealing body 7 and capacitor element 1 thus formed are housed together in an exterior case 2, and the opening of the exterior case 2 is subjected to a crimping process to seal the capacitor element 1.

As described above, this invention consists of an aluminum plate on which external lead wires are erected and insertion holes at positions symmetrical to the center point of the external lead wires, and at least two insertion holes near the center. The sealing body has a hole and an elastic insulator that covers at least the upper and lower end surfaces and side surfaces of the completed sealing body, and the elastic insulator is sandwiched between the two aluminum plates. Since the lead wire from the capacitor element is connected to the aluminum plate, it has superior airtightness compared to electrolytic capacitors with a conventional sealing structure, and the electrolyte is less The leakage of
There is no risk of adversely affecting the life characteristics of the electrolytic capacitor.

In addition, if the airtightness required for conventional electrolytic capacitors is to be achieved, the sealing body can be formed thinner, and the vertical dimension of the completed electrolytic capacitor can therefore be shortened, making the overall product smaller and lighter. It becomes possible to

In addition, since most of the parts of the sealing body according to this invention that come into contact with the capacitor element and the part that come into contact with the electrolyte are made of metal such as aluminum, there is little risk of impurities such as elastic rubber being deposited. It does not adversely affect the electrical characteristics of the electrolytic capacitor.

Furthermore, since the elastic insulator is firmly supported by two aluminum plates, it has excellent mechanical strength and has sufficient pressure resistance even when the pressure inside the capacitor increases.

In addition, even when the electrolytic capacitor of this invention is used at high temperatures, since only a small amount of elastic rubber, which is susceptible to change due to heat, is used, there is little risk that the sealing body will be deformed or its composition will change. This prevents the electrolyte from evaporating to the outside, which can be expected to improve life characteristics and make it possible to create flame-retardant electrolytic capacitors.

In summary, the electrolytic capacitor invented by this invention has excellent airtightness and can be made smaller and lighter while retaining the internal sealing properties of conventional capacitors, as well as improving mechanical strength, flame retardance, etc. This is a useful idea.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views showing the structure of a conventional electrolytic capacitor, Figures 3 and 4 are views explaining the electrolytic capacitor according to this invention, and Figure 3 is a cross-sectional view showing the completed state. FIG. 4 is an exploded perspective view showing the assembly structure of the sealing body. Note that common parts and portions in each drawing are designated by common reference numerals. 1...Capacitor element, 2...Exterior case, 3゜7...Sealing body, 4...Elastic rubber ring, 5,6゜13,14 ...External drawer lead wire, 8, 9...Metal plate, 10...
・Elastic insulator, 11, 12, 15° 16...
Insertion hole, 17, 18... Electrode extraction lead wire.

Claims (3)

[Scope of utility model registration request] (1) An aluminum plate on which an external lead wire is erected and has an insertion hole bored therein, and an elastic insulating plate with at least two or more insertion holes near the center. An electrolytic capacitor characterized in that an insulating plate is mounted with a sealing body which is sandwiched between the two aluminum plates, and a lead wire led out from a capacitor element is connected to the two aluminum plates. (2) The electrolyzer according to claim 1 of the utility model registration claim, characterized in that the insertion hole drilled in the aluminum plate is arranged at a position symmetrical with respect to the center point of the external lead wire. capacitor. (3) The electrolytic capacitor according to claim 1, wherein the elastic insulating plate covers at least the side surfaces and the peripheral edges of the upper and lower end surfaces of the sealing body.