JPS6252445B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In the event of an abnormality, such as when a DC voltage higher than the rated voltage is applied, the present invention prevents an internal short-circuit from occurring before an explosion or activation of the explosion-proof valve, and an appropriate external protective device (fuse). This relates to a non-polluting capacitor that can be used to operate circuit breakers, circuit breakers, etc.

Conventionally, capacitors such as electrolytic capacitors and oil-immersed capacitors have a structure in which a part of the container that houses the capacitor element, such as a fragile part of the terminal plate, breaks when the pressure due to internally generated gas reaches a certain level. Normally, it has a so-called explosion-proof structure and is designed to prevent dangerous situations such as explosions and ignition. There is a risk of secondary disasters such as contamination due to liquid leakage and tracking associated with this, and it has drawbacks in terms of pollution.

The present invention seeks to provide a capacitor which eliminates the above-mentioned drawbacks.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments of electrolytic capacitors shown in FIGS. 1 and 2.

Fig. 1 is a cross-sectional view of an electrolytic capacitor, and Fig. 2 is an exploded view of the main parts of the capacitor element. 1 is a cylindrical container made of aluminum or the like, and 2 is a rubber seal for airtightly sealing the opening of the container 1. Elastic plate 2a such as
and an insulating plate 2b such as a hard phenol resin plate, 7 is a capacitor element housed in the container 2, an anode electrode foil 3, a separator 4 such as electrolytic paper, a thermoplastic resin film 5 and a cathode electrode foil 6. 8 is a lead connected to the anode electrode foil 3, 9 is a lead connected to the cathode electrode foil 6, and the terminal 1 is implanted in the terminal plate 2.
0 and 11 are connected by caulking or the like. 1
2 is a small hole for an explosion-proof valve provided in the insulating plate 2b.
In some cases, the small hole 12 is not provided in the insulating plate 2b, and a thin wall portion or a cutout is provided in the bottom or side surface of the container 1 to provide an explosion-proof mechanism.

The thermoplastic resin film 5 is polyethylene,
Polypropylene, polyacetal, polycarbonate, polystyrene, etc. are used, and holes 14 are formed by punching in at least one of the anode electrode foil 3 and the cathode electrode foil 6, and a separator 4 such as electrolytic paper facing the holes 14. The hole 13 is provided on the side surface of the hole 13 which is similarly machined. The edge of the hole 14 is arranged so as to overlap or be inside the edge of the hole 13.

Further, the holes 13 and 14 are not limited to circular shapes as shown in FIG. 2, but can be formed into any arbitrary shape such as an ellipse or a polygon.

Since the capacitor of the present invention is constructed as described above, it is possible to prevent the application of overvoltage to the capacitor element 7.
When an abnormal current flows through the capacitor during abnormal conditions such as deterioration of the capacitor, heat is generated internally, raising the temperature of the capacitor element 7, and the thermoplastic resin film 5 melts.
This melting causes a short circuit between the edge of the hole 14 of the electrode foil 3 and the other electrode foil 6 at the hole 13 of the separator 4 .
Furthermore, when the edges of the holes 14 in the electrode foil 3 are processed by punching, etc., burrs 15 are formed as shown in FIG.
By adjusting the height of the burr 15 and the thickness of the thermoplastic resin film, the sensitivity to short circuits in abnormal situations can be arbitrarily selected.

The current flowing due to this short circuit can operate a suitable protective device such as a fuse or breaker provided in the external circuit, and the capacitor can be electrically disconnected from the circuit reliably. This prevents the capacitor from exploding or catching fire, and prevents leakage of electrolyte.
It becomes possible to produce safe and pollution-free electronic devices.
In addition, by using an explosion-proof valve in combination, a double safety function can be achieved.

Although the above embodiments have been described with respect to polar electrolytic capacitors, similar effects can be obtained with other wound or laminated capacitors such as non-polar, alternating current electrolytic capacitors, and oil-immersed capacitors. Furthermore, the number of holes formed in at least one of the electrode foils facing each other, and the number of places where a separator, insulating paper, or thermoplastic resin film is interposed in place of the insulating film, is not limited to one; There is no problem even if there are multiple locations depending on the purpose.

As mentioned above, the capacitor of the present invention is a capacitor formed by winding or laminating a separator, an insulating paper, or an insulating film between opposing electrode foils, and a hole of an arbitrary shape is formed in at least one of the opposing electrode foils. A capacitor comprising one or more holes, a hole larger than the hole in a separator, insulating paper, or insulating film facing the hole, and a thermoplastic resin film disposed in and around the hole. It is inexpensive, mass-producible, extremely advantageous in terms of safety, and has great industrial and practical value.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an electrolytic capacitor according to an embodiment of the present invention, Fig. 2 is an exploded view of the main parts of the same capacitor element, A is a front view, B is a sectional view, and Fig. 3 is an enlarged sectional view of the main parts. It is. 3: Anode electrode foil, 4: Separator, 5: Thermoplastic resin film, 6: Cathode electrode foil, 13: Hole, 1
4: hole, 15: burr.

Claims (1)

[Claims] 1. In a capacitor formed by winding or laminating a separator, insulating paper, or insulating film between opposing electrode foils, a hole of any shape is made in at least one of the opposing electrode foils, and the separator or A capacitor characterized in that a hole larger than the hole is cut out in an insulating paper or an insulating film, and a thermoplastic resin film is disposed in and around the hole.