JPH0451468Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electrolytic capacitor with an improved sealing part.

As shown in Figures 1 and 2, conventional electrolytic capacitors have an anode lead terminal 1 connected to an anode electrode foil, a cathode electrode foil 2 connected to a lead plate 2, and a separator such as electrolytic paper. The capacitor element 3 is formed by winding the capacitor element 3 through the capacitor. Next, after impregnating the capacitor element 3 with an electrolytic solution, the lead terminal 1 is inserted into the through hole 6 of the elastic sealing member 4 made of rubber, etc., and the lead plate 2 is welded to the metal case 5, and the capacitor element 3 and the elastic sealing body 4 were housed in a metal case 5, and the opening of the case 5 was sealed by wrapping. 7 is a cathode lead terminal welded to the metal case 5, and 8 is an explosion-proof hole.

When the electrolytic capacitor configured as described above is exposed to high temperatures, the elastic sealing body 4 deteriorates and the airtightness becomes incomplete, and the electrolytic capacitor that is configured as described above may absorb moisture by penetrating the thin wall part above the explosion-proof hole 8 of the elastic sealing body 4. There were drawbacks such as electrolyte leakage. For this reason, there are sealing bodies made of silicone, Teflon, etc. that have the same shape as the elastic sealing body 4, but these have the disadvantage of high cost.

The present invention eliminates the above-mentioned drawbacks and provides an electrolytic capacitor that is highly airtight and can be manufactured at low cost.

Hereinafter, one embodiment of the present invention shown in FIGS. 3 and 4 will be described.

FIG. 3 shows a sealing body, in which numeral 9 is a plastic plate made of polypropylene, polyester, etc. with a thickness of 0.5 to 1.0 mm, and a recess 10 having a hole diameter A is provided in the plastic plate 9. Reference numeral 11 denotes an elastic body made of butyl rubber, ethylene propylene rubber, etc., which is formed integrally with the plastic plate 9 by bonding, molding, etc., and an explosion-proof hole 12 is provided in a portion facing the recess 10. The hole diameter B is set smaller than the hole diameter A of the recess 10. Further, in the center of the sealing body 13 formed by integrally forming the plastic plate 9 and the elastic body 11, there is provided an insertion hole 14 through which the anode lead terminal 1 led out from the capacitor element 3 is inserted.

The capacitor element 3 is inserted into the insertion hole of the sealing body 13 described above.
Insert the anode lead terminal 1 led out from the
In addition, the cathode lead plate led out from the capacitor element 3 is connected to the metal case 5, the capacitor element 3 and the sealing body 13 are housed in the metal case 5, and the opening of the case 5 is tightened as shown in FIG. Complete by sealing.

The electrolytic capacitor of the present invention is constructed as described above. Therefore, the outer surface of the sealing body 13 of the electrolytic capacitor is made of polypropylene, polyester, or the like, which is relatively chemical resistant and heat resistant, and the thermoplastic plastic plate 9 is integrated to form two layers, and the explosion-proof valve is made of plastic. Since it is constituted by the bottom of the recess 10 provided in the plate 9,
The outside air and the electrolyte with which the capacitor element 3 is impregnated are blocked by the plastic plate 9 even at high temperatures and long-term use. Therefore, moisture absorption and liquid leakage do not occur, and stable quality can be maintained even when used for long periods of time at high temperatures. This has the effect of preventing the cleaning agent from penetrating inside the capacitor and altering the electrolyte.

In addition, the hole diameter A of the recess 10 provided in the plastic plate 9 is deformed to be larger than the hole diameter B of the explosion-proof hole 12 provided in the elastic body 11 facing the recess 10, so that the capacitor may generate heat in an abnormal situation. The internal pressure increases, the plastic plate 9 is thermally deformed, and the explosion-proof operation becomes easier, and the hole diameter B can be set smaller to that extent, and the plastic plate 9 is tightly tightened, resulting in a marked improvement in airtightness.

FIGS. 5 and 6 show another embodiment in which a plastic plate 9 is disposed on the capacitor element side of the sealing body 13 described above, and the same effects as those described above are obtained, and a concave portion 10 is further provided with a capacitor. The heat of the element 3 is transferred, making it easier to perform explosion-proof operation.
In this case, the hole diameter A of the recess 10 is the hole diameter B of the explosion-proof hole 12.
It is not necessarily necessary to make it larger than that, and it may be made equal to or smaller than that.

Although the above-mentioned embodiment describes an electrolytic capacitor with lead wire terminals in opposite directions, it goes without saying that the same effect can be achieved with an electrolytic capacitor with lead wire terminals in the same direction. The gist of the present invention will not change even if the shape of the diameter, the shape of the seam, etc. are changed as appropriate.

As mentioned above, the electrolytic capacitor of the present invention is extremely advantageous in terms of airtightness and explosion protection, and is of great practical value.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a sealing body of a conventional electrolytic capacitor, Fig. 2 is a sectional view of a conventional electrolytic capacitor, and Fig. 3 is a sealing body according to the present invention. FIG. 4 is a sectional view of a main part of one embodiment of the electrolytic capacitor of the present invention, and FIGS. 5 and 6 are sectional views of main parts of other embodiments of the electrolytic capacitor of the present invention. 1... Output lead terminal, 3... Capacitor element, 5... Metal case, 9... Plastic plate,
10... Recess, 11... Elastic body, 12... Explosion-proof hole, 13... Sealing body, A... Hole diameter of recess 9, B...
...Hole diameter of explosion-proof hole 11.

Claims (1)

[Scope of utility model registration request] In an electrolytic capacitor in which the lead terminal 1 led out from the capacitor element 3 is inserted into the sealing body 13, and this is housed in the case 5, and the opening and side surfaces of the case are tightened and sealed, the sealing body is A thermoplastic plastic plate 9 such as polypropylene and an elastic body 11 such as rubber are integrally formed, a recess 10 is provided in the plastic plate 9, and a hole diameter of the recess 10 is formed in the elastic body 11 facing the recess 10. An electrolytic capacitor characterized by having an explosion-proof hole 12 having a hole diameter B smaller than A.