JPH085544Y2 - Electrolytic capacitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrolytic capacitor, which is intended to prevent a secondary disaster after a valve is actuated to prevent an explosion due to an abnormality of the capacitor. Is.

2. Description of the Related Art In recent years, with the miniaturization of equipment, power supply smoothing circuits have been incorporated into printed circuit boards, and aluminum electrolytic capacitors for smoothing have also moved to self-supporting structures in which terminals are directly inserted into the printed circuit boards and fixed by soldering. .

Generally, aluminum electrolytic capacitors have a surface area enlarged by etching the surface of an aluminum foil, and an electrode foil formed by forming an oxide film on the aluminum foil is made to face each other via a separator made of electrolytic paper or the like, and wound to form a capacitor element. Composed.

Then, ethylene glycol was impregnated with an electrolytic solution of water, an organic acid such as adipic acid or boric acid, or a salt thereof, the capacitor element was put in a case, and sealed to complete.

And overvoltage or reverse voltage is applied to the capacitor,
If a large amount of alternating current is applied, or if there is a life or failure, an excessive current will flow, gas will be generated from the electrolyte, the internal pressure will rise, and there is a danger that an explosion will occur eventually. There was an explosion-proof valve that formed a thin portion and released the internal pressure.

Problems to be Solved by the Invention In the above-described conventional electrolytic capacitor, when the explosion-proof valve operates and opens, the electrolytic solution oozes out as shown in FIG. 9 spreads on the surface of No. 9 and causes tracking between the terminals 5 and 5, and there is a problem that heat generation, smoke generation and ignition occur.

Means for Solving the Problems The present invention solves the above-mentioned problems and provides an electrolytic capacitor having an explosion-proof valve in which a thin portion (3) is provided in a main part of the case (2). ) An electrolytic capacitor in which an ion exchange resin (6, 7) is arranged on the thin portion (3) on the bottom surface or on the circumference of the outer wall surface of the case (2).

Action The ion exchange resin is a resin for exchanging the ions dissolved in the aqueous solution with the ions possessed by the ion exchange resin itself, and has an ion exchange group bonded to styrene and a divinylbenzene polymer.

Ion exchange groups include COOH groups and SO ₃ H groups that function as cation exchange, and amine groups that function as anions. Cation and anion exchange resins called snake gauge ion exchange resins. There are amphoteric ion exchange resins that are entangled with each other, and they are generally processed into granules or sheets, and processing such as attaching to the outer wall of the capacitor is easy.

When the driving electrolytic solution overflowing from the valve opening portion of the case described above fills the outer wall of the case, the conductivity is lowered by passing through the ion-exchange resin attached to the outer wall in advance,
Tracking and heat generation between terminals can be reduced, and secondary disasters can be prevented so as to prevent ignition.

Embodiment Hereinafter, the present invention will be described with reference to an embodiment shown in FIGS. 1 and 2.

1 and 2, 1 is a capacitor element,
Reference numeral 2 is a cylindrical case, and a thin portion 3 is formed on the bottom surface of the case 2. Reference numeral 4 denotes a sealing plate, and a terminal 5 is crimped and fixed to the sealing plate 4 with a rivet, and the tab led out from the capacitor element 1 and the terminal 5 are connected via a rivet.
6 and 7 are ion exchange resins, FIG. 1 shows an embodiment in which the ion exchange resin 6 is arranged on the cross-shaped thin portion 3, and FIG. 2 shows the ion exchange resin 7 arranged on the circumference of the outer wall surface of the case 2. It is another example.

Therefore, by attaching a sheet of ion-exchange resin processed to the outer wall surface of the case or applying the resin to the outer wall surface of the case, the electrolyte ion-exchange leaked from the open part of the explosion-proof valve of the case By contacting with the resin, the conductivity of the electrolytic solution is reduced, the tracking and heat generation between terminals are reduced, and secondary accidents can be prevented so as to prevent ignition.

Effect of the Invention Since the electrolytic capacitor of the present invention is configured as described above, even if the explosion-proof valve operates and the electrolyte leaks out when the capacitor malfunctions, it prevents secondary harmful effects such as smoke and ignition. , Which can improve safety and is of great practical value.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of an electrolytic capacitor according to the present invention, FIG. 2 is a sectional view of another embodiment of an electrolytic capacitor according to the present invention, and FIG. 3 is a sectional view of a conventional electrolytic capacitor when an explosion-proof valve is operating. It is a figure. 1: Capacitor element, 2: Case 3: Thin part, 6, 7: Ion exchange resin

Claims (1)

[Scope of utility model registration request] 1. An electrolytic capacitor having an explosion-proof valve comprising a thin portion (3) provided on a main part of the case (2), the thin wall portion (3) at the bottom of the case (2) or the outer wall surface of the case (2). An electrolytic capacitor having an ion exchange resin (6, 7) arranged on the circumference of the electrolytic capacitor.