JPS63168017A - Capacitor built in case - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a case-built-in capacitor having a safety function.

(Prior art) Capacitors such as aluminum electrolytic capacitors and film capacitors, in which the capacitor element is housed in a case, can explode due to an increase in internal pressure.

In order to prevent this explosion, conventionally, a thin wall portion is provided on the lid to serve as an explosion-proof valve, and when the internal pressure rises, the explosion-proof valve is activated to release the internal gas to the outside. In addition, a device is used in which a fuse is connected in series with the capacitor element, and the fuse is blown out due to internal heat generation or overcurrent, thereby disconnecting the circuit.

(Problem to be solved by the invention) However, in the former case, when the explosion-proof valve operates, it may produce a popping sound or smoke, startling the user of the device, or cause the internal electrolyte to scatter, causing other problems. It had the disadvantage of damaging electronic components. In the latter case, the fuse may not blow out when the current does not increase rapidly but gradually heats up and the internal pressure rises, and the aging current or high temperature during aging causes the fuse to blow out and malfunction.

The object of the present invention is to improve the above-mentioned drawbacks, and to provide a case-built-in capacitor that can eliminate negative effects on the outside and reliably prevent explosions.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a capacitor with a built-in case in which a capacitor element is housed in a case, and a lid with terminals inserted therethrough is sealed. 1st for connection
a terminal, a second terminal for lead connection drawn out from the capacitor element, a conductor plate connected between the first terminal and the second terminal, and a lead for external connection and drawn out from the capacitor element. It is characterized by having a third terminal for connection, and a four-conductor shorting plate that is connected to the third terminal and can come into contact with the conductor plate by expansion of an explosion-proof valve provided on the lid or deformation of the lid. This product provides a case built-in capacitor.

(Function) According to the present invention, when the capacitor element generates heat, the internal pressure of the case rises, and the explosion-proof valve expands, the short-circuit plate is raised by the explosion-proof valve and comes into contact with the conductor plate. As a result, the capacitor becomes short-circuited, suppressing the increase in internal pressure and preventing explosion. Particularly, when the conductor plate is a fuse, when the short circuit plate comes into contact with the fuse, a short circuit current flows through the fuse and blows it out, thereby preventing an explosion.

Furthermore, instead of using an explosion-proof valve, the shorting plate can be brought into contact with the conductor plate by deforming the lid due to an increase in internal pressure, and explosion-proofing can be achieved.

(Example) Hereinafter, the present invention will be explained based on illustrated embodiments.

In FIGS. 1 and 2, 1 is a cylindrical case made of aluminum or the like. 2 is a capacitor element built into this case, which is made by overlapping and winding aluminum electrode foil etc. with a separator in between, from which lead wire 3 for the anode and lead wire 4 for the cathode are drawn out. . 5 is case 2
The lid is caulked to the open end of the lid, and is made of rubber-covered laminate. Reference numeral 6 designates an explosion-proof valve provided on the lid 5, which is a thin walled portion. Reference numeral 7 denotes a first terminal for external connection, which is provided through the lid 5. Reference numeral 8 denotes a second terminal provided through M5, to which an anode lead Ii3 is connected. Reference numeral 9 denotes a conductor plate such as a fuse connected between the first terminal 7 and the second terminal 8 by a rivet, and a part of the conductor plate passes through the upper part of the explosion-proof valve 6.

Reference numeral 10 denotes a third terminal provided through the M5, which is used for external connection and is connected to the cathode glue wire 4. Reference numeral 11 denotes a conductive shorting plate connected to the third terminal 10 with a rivet, and its tip 12 is in contact with the surface of the explosion-proof valve 6 and is separated from the conductor plate 9 by a certain space. Reference numeral 13 denotes an insulating protection plate having the same shape as the lid 5 and attached to the upper part of the lid 5, through which the tips of the first terminal 7 and the third terminal 10 are held. 14 is M
5 and the protection plate 13. 1
5 is a heat-shrinkable tube covered with the case 1 and the protection plate 13.

Next, the operation of the above embodiment will be described.

First, when the capacitor element generates heat, the pressure inside the case increases, and the rubber 16 of the explosion-proof valve 6 expands as shown in FIG. The tip 12 of the shorting plate 11 is in contact with the explosion-proof valve 6 , and as the explosion-proof valve 6 expands, the tip 12 moves upward and comes into contact with the conductor plate 9 . When the short circuit plate 11 contacts the conductor plate 9, a short circuit current flows from the external circuit through the first terminal 7, the conductor plate 9, the short circuit plate 11, and the third terminal 10. Therefore, if the conductor plate 9 is a fuse, it will be blown by this short circuit current, and if it is not a fuse, a fuse built into the external circuit will be blown. In either case, the heat generation of the capacitor element is suppressed and explosion can be prevented.

Further, FIGS. 4 and 5 show other embodiments of the present invention,
In particular, due to the deformation of M16 due to the increase in internal pressure, the shorting plate 18 connected to the third terminal 17 is
It contacts the conductor plate 21 connected between the two terminals and causes a short circuit.

Furthermore, FIG. 6 shows that the extension part 23 is pulled out from the first terminal 22, a conductor plate 25 is connected between the tip of this extension part 23 and the second terminal 24, and a single-shaped part is connected to the third terminal 26. A shorting plate 27 is connected, and the tip of the shorting plate 27 intersects the conductor plate 25 at approximately the center of the lid 28. That is, since the conductor plate 25 and the short circuit plate 27 intersect at approximately the center where the deformation of the M2R is greatest, the explosion-proof effect is great.

In the embodiment shown in FIG. 5, an explosion-proof valve is provided at the point where the conductor plate 25 and the short circuit plate 27 intersect, as in the embodiment shown in FIG. Board 2
7 may be short-circuited.

(Effects of the Invention) As described above, according to the present invention, the explosion-proof valve can be ruptured by short-circuiting or further opening the external connection terminals using the expansion of the explosion-proof valve and the deformation of the lid. Explosions can be prevented without causing any damage, eliminating any negative effects on the user of the 11 device, and preventing damage to other electronic components. Further, malfunction of the fuse can be prevented, and a capacitor with a built-in case that is reliably explosion-proof can be obtained.

[Brief explanation of the drawing]

4 is a front sectional view of another embodiment of the present invention; FIG. 5 is a front sectional view of the short-circuited state; FIG. 5 is a front sectional view of the embodiment shown in FIG. 4; 4... Lead wire, 5, 10.28... Lid, 6... Explosion-proof valve, 7
, 19.22...first terminal. 8.20.24...Second terminal, 9.21.25...Conductor plate, 10.17.26...Third terminal, 11.18.27...Short circuit plate, 13... protection plate.

Claims (3)

[Claims] (1) In case-built-in capacitors in which a capacitor element is housed in a case and sealed with a lid with a terminal through it, there is a first terminal for external connection and a second terminal for lead connection drawn out from the capacitor element. a terminal, a conductor plate connected between the first terminal and the second terminal, a third terminal for external connection and lead connection drawn out from the capacitor element, and a third terminal connected to the third terminal. A case-built-in capacitor characterized by having a conductive shorting plate that can come into contact with the conductive plate when an explosion-proof valve provided on the lid expands or the lid deforms. (2) The case built-in capacitor according to claim 1, wherein the conductive plate is a fuse. (3) The case built-in capacitor according to claim 1 or 2, wherein a protection plate is provided on the top of the lid through which the first terminal and the second terminal pass.