JPS6212652B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In an abnormal situation 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 an explosion-proof valve, and prevents an appropriate external protection device ( This relates to non-polluting capacitors that can operate fuses, breakers, etc.

Conventional capacitors, such as electrolytic capacitors and oil-immersed capacitors, have a so-called explosion-proof structure in which a part of the container that houses the capacitor element, such as a fragile part of the terminal board, breaks when the pressure from internally generated gas reaches a certain level or higher. Normally, the structure is designed to prevent dangerous situations such as explosions and ignitions, but in the event of an abnormality, the explosion-proof structure may be activated due to operating noise, gas spouting, and internal impregnation liquid leaking. There was a risk of secondary disasters such as pollution and tracking associated with this, and it had drawbacks in terms of pollution.

The present invention is provided to obviate the above-mentioned drawbacks. The present invention will be described below with reference to embodiments of electrolytic capacitors shown in FIGS. 1 to 4.

Figure 1 is a cross-sectional view of an electrolytic capacitor, Figure 2 A is a front view of the same capacitor element, Figure 2 B is an exploded view of the main parts of the same capacitor element, and Figure 3 is an explanatory cross-section of another electrolytic capacitor during assembly. Figure 4 is a cross-sectional view of the electrolytic capacitor shown in Figure 3, where 1 is a cylindrical container made of aluminum or the like, 2 is an elastic plate 2a made of rubber or the like for airtightly sealing the opening of the container, and a hard plate. A terminal board is formed by laminating an insulating plate 2b such as a phenol resin plate, 9 is a capacitor element housed in the container 1, and an anode electrode foil 3 and a cathode wound so as to protrude from the bottom of the capacitor element 9. It is wound around the electrode foil 6 with a separator 8 such as electrolytic paper interposed therebetween. The anode lead 4 is connected to the anode foil 3, and the cathode lead 7 is connected to the cathode foil 6. The anode lead 4 is led out from the bottom of the capacitor element 9. This drawn out anode lead 4 is made of polyethylene,
A cylindrical or bag-shaped thermoplastic resin film 5 made of polypropylene, polyacetal, polycarbonate, polystyrene, etc. is placed over the capacitor element 9 and brought into contact with the cathode electrode foil 6 protruding from the end of the capacitor element 9. The anode lead 4 and cathode lead 7 are connected to terminals 11 and 10 implanted in the terminal plate 2 by caulking or the like, respectively. 12 is a small hole for an explosion-proof valve provided in the insulating plate 2b. In addition,
In some cases, the small hole 12 is not provided in the insulating plate 2b, but a thin wall portion, a notch, etc. are provided in the bottom or side surface of the container 1 to provide an explosion-proof mechanism. Reference numeral 13 denotes a fixing material for the capacitor element 9, which is made of a compound or the like, but as shown in FIG. 3, an elastic fixing material 14 may be used to constantly press the bottom of the capacitor element 9 during sealing.

Since the capacitor of the present invention is configured as described above, in the event of an abnormality such as application of overvoltage or deterioration of the capacitor element 9, when an abnormal current flows through the capacitor, heat is generated internally and the temperature of the capacitor element 9 increases. The temperature is conducted to the protruding electrode part 6a of the cathode electrode foil 6, and the thermoplastic resin film 5 that is in contact with this melts, and the anode lead 4 and the protruding electrode part of the cathode electrode foil 6 are connected to the melted part. 6a
is shorted.

Therefore, appropriate protective devices such as fuses and breakers provided in the external circuit can be activated by the short-circuit current, and the capacitor can be reliably electrically disconnected from the circuit. 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.
Further, by providing the above-mentioned explosion-proof mechanism, it has a double safety function and is extremely advantageous in terms of safety.

Although the above-mentioned embodiments have been described with respect to polar electrolytic capacitors, the same effect can be achieved with other non-inductive or laminated capacitors in which opposing electrode foils are offset from each other and protrude from the end of the capacitor element. The number of lead-out leads is not limited to one. Further, the thermoplastic resin film 5 may be any material as long as it melts when heated, and may be a thermoplastic resin coating material. Any material that can form a layer may be used.

As described above, the capacitor of the present invention is a capacitor formed by winding or laminating the electrodes with a separator interposed between the opposing electrodes.
A capacitor characterized by contacting the end surface of the other electrode protruding from the end of the capacitor element,
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. 2A is a front view of the same capacitor element,
Figure 2B is an exploded view of the main parts of the capacitor element, Figure 3
The figure is an explanatory cross-sectional view during assembly of an electrolytic capacitor according to another embodiment of the present invention, and FIG. 4 is a cross-sectional view of the same capacitor. 3: anode electrode foil, 4: anode lead, 5: thermoplastic resin film, 6: cathode electrode foil, 6a: protruding electrode portion of cathode electrode foil 6, 8: separator.

Claims (1)

[Claims] 1. In an electrolytic capacitor formed by winding or laminating between opposing electrodes with a separator in between, a lead lead connected to at least one electrode and led out from the bottom of the capacitor element is connected to the end of the capacitor element through a thermoplastic resin layer. An electrolytic capacitor characterized in that a fuse or a breaker is connected in series with the capacitor and in contact with the end surface of the other electrode that protrudes from the other end.