JPS6025898Y2 - 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 and mechanical strength 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 It was attached to the opening of the exterior case 2 to seal the capacitor.

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, no matter which electrolytic capacitor has the above-mentioned sealing structure, impurities in the elastic rubber will precipitate due to the chemical action of the electrolyte, which will adversely affect the electrical characteristics of the electrolytic capacitor, or the airtightness will deteriorate due to aging of the elastic rubber. There was a risk that the electrolytic capacitor would not be able to hold it, and the life characteristics of the electrolytic capacitor would be adversely affected.

In addition, in the electrolytic capacitor shown in Fig. 2, the adhesion between the outer case 2 made of aluminum or the like and the rivets or external lead wires 5 and 6 and the synthetic resin sealing body 3 is poor, and the airtightness is also poor. 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, electronic components including recent electrolytic capacitors,
A maximum operating temperature of 100°C to 150°C is now required, and the conventional sealing structure made only of elastic Got1 and synthetic resin has poor heat resistance, and due to deterioration over time, the electrolyte evaporates and the internal pressure increases. There was a risk of an explosion.

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 includes: a first metal plate on which an external connection lead wire is erected and an insertion hole formed; a second metal plate on which an external connection lead wire is erected and an insertion hole formed; It is formed from an elastic insulating plate provided with at least two insertion holes and an elastic rubber ring formed into a U-shape in cross section.

This elastic insulating plate is sandwiched between a first metal plate and a second metal plate, and the external lead wire protrudes to the outside through the insertion hole, and the elastic rubber ring is inserted between the first metal plate and the second metal plate. The sealing body formed by covering the periphery of the metal plate No. 2 is attached to the opening of the exterior case.

Further, one electrode lead wire led out from the capacitor element is connected to the first metal plate, and the other electrode lead wire is connected to the second metal plate.

Furthermore, the first and second metal plates are characterized in that they are provided with protrusions on the peripheral edges of their upper surfaces, and that the peripheral edges of the upper surfaces of the insertion holes are also provided with protrusions.

Furthermore, the elastic insulating plate is characterized in that it has at least two or more insertion holes with different diameters.

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

FIG. 3 is a sectional view showing the completed electrolytic capacitor according to this invention.

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 9 is installed upright on a first metal plate 7 made of aluminum or the like, and the first metal plate 7 has a position symmetrical to the external lead wire 9 at the center point. An insertion hole 13 is formed in the vicinity of the second metal plate 8, through which an external lead wire 10 is inserted.

Further, protrusions 17.18 formed by pressing or the like are formed on the peripheral edges of the insertion holes 13, 16 formed in the first and second metal plates 7, 8 and on the peripheral edge of the metal plate 7.8. It is formed.

The elastic insulating plate 12 is formed into a disk shape, and has insertion holes 14 and 15 at locations corresponding to the connection positions of the external lead wires 9 and 10 provided upright on the first and second metal plates 7 and 8.
It is equipped with

These members are arranged in the order of the first metal plate 7°, the elastic insulating plate 12, and the second metal plate 8 from above.

External lead wire 10 erected on second metal plate 8
The insertion hole 14 formed in the elastic insulating plate 12 and the insertion hole 13 formed in the first metal plate 7 are inserted through the insertion hole 14 and project upwardly from the first metal plate 7 .

The above-mentioned members are integrated to form a joint plate.

The circumferential end surface and side surface of the joint plate thus formed are covered with an elastic rubber ring 11, and the joint plate is integrated to form a sealing body 21.

On the other hand, electrode lead wires 19 and 20 led out from the end face of the capacitor element 1 are electrically connected to the exposed metal portion of the sealing body 21 by methods such as ultrasonic welding and pressing.

In particular, one electrode lead wire 19 passes through an insertion hole 16 provided in the second metal plate 8 and an insertion hole 15 provided in the elastic insulating plate 12 to be electrically connected to the first metal plate 7. Connected.

The sealing body 21 and capacitor element 1 thus formed are housed in an exterior case 2 and a crimping process is performed on the opening of the exterior case 2 to seal the capacitor element 1.

As described above, this invention consists of a first metal plate on which an external connection lead wire stands up and an insertion hole is formed, and a second metal plate on which an external connection lead wire stands up and an insertion hole is formed. It is formed from a metal plate, an elastic insulating plate provided with at least two insertion holes, and an elastic rubber ring formed into a U-shape in cross section. The external lead wire is sandwiched between the metal plates and protrudes to the outside through the insertion hole, and a sealing body is formed by covering the peripheral edges of the first metal plate and the second metal plate with an elastic rubber ring. One electrode lead wire attached to the opening of the exterior case and led out from the capacitor element is connected to the first metal plate, and the other electrode lead wire is connected to the second metal plate.
In addition, the first and second metal plates are provided with a protrusion on the upper surface periphery, and a protrusion is also provided on the upper surface periphery of the insertion hole. As a result, the joint area between the external lead wire and the sealing body is increased.Therefore, compared to electrolytic capacitors with a conventional sealing structure, the sealing body made of elastic rubber etc. has excellent airtightness. The electrolyte leakage that was observed in the case of 2 is also reduced, and 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 of 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. , has no adverse effect on the electrical characteristics of the electrolytic capacitor.

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

Furthermore, 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 of the sealing body deforming or changing its composition. This eliminates the possibility of the electrolyte 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 maintaining the same sealing performance as conventional ones. It is an idea.

[Brief explanation of the drawing]

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. 1... Capacitor element, 2... Exterior case, 3.21... Sealing body, 4, 11...
...Elastic rubber ring, 5, 6, 9, 10... External lead wire, 7.8... Metal plate, 12.
...Elastic insulation board, 13゜14.15,16...
...Insertion hole, 17, 18...Protrusion, 19.
20... Electrode extraction lead wire.

Claims (3)

[Scope of utility model registration request] (1) The external lead wire 9 is installed upright, and the bracket insertion hole 13
A first metal plate 7 having a shape formed thereon and an external connection lead wire 10
a second metal plate 8 on which is erected and an insertion hole 16 is formed;
, an elastic insulating plate 12 provided with at least two insertion holes 14 and 15, and an elastic rubber ring 11 formed into a U-shaped cross section. Sandwiched between the metal plate 8 and the external lead wire 10,
A sealing body 21 is made to protrude to the outside through the insertion holes 14 and 13, and is shaped by covering the circumferential edges of the first metal plate 7 and the second metal plate 8 with the elastic rubber ring 11.
It is attached to the opening of the exterior case 2, and one electrode lead wire 19 led out from the capacitor element 1 is connected to the first metal plate 7, and the other electrode lead wire 20 is connected to the second metal plate. An electrolytic capacitor characterized by being connected to 8. (2) The first metal plate 7 and the second metal plate 8 are provided with a protrusion 17 on the periphery of the upper surface, and a protrusion 18 on the periphery of the upper surface of the insertion holes 13 and 16. An electrolytic capacitor according to claim 1 of the utility model registration claim. (3) The electrolytic capacitor according to claim 1, wherein the elastic insulating plate 12 is provided with at least two insertion holes 14 and 15 having different diameters.