JPH0433320A - Aluminum electrolytic capacitor - 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] Industrial applications The present invention relates to an aluminum electrolytic capacitor.

Conventional technology Conventional aluminum electrolytic capacitors are made by forming a dielectric oxide film on the surface of a roughened aluminum foil, and winding this together with a separator to form a capacitor element. It was constructed by enclosing it inside an aluminum case.

When an overvoltage higher than the rated voltage is applied to this aluminum electrolytic capacitor, the temperature of the driving electrolyte impregnated in the capacitor element rises and vaporizes, so that the internal pressure of the aluminum case rises. In this case, if the internal pressure of the aluminum case exceeds the sealing force of the sealing member of the aluminum case,
The capacitor element may come off the aluminum case and fly out of the aluminum case, or the aluminum case may fly off, which is extremely dangerous.

Therefore, in this type of aluminum electrolytic capacitor, the aluminum case usually has a weak point, and when the internal pressure of the aluminum case rises abnormally, the weak point breaks and the driving electrolyte gas inside the aluminum case. This does not result in a large explosion, as the water will flow outside.

Problems to be Solved by the Invention However, in the above-mentioned conventional aluminum electrolytic capacitors, gas from the driving electrolyte leaks out of the capacitor, which may cause the inside of the equipment in which the aluminum electrolytic capacitor is installed to become dirty or cause flames to ignite. The problem was that it was indistinguishable from smoke caused by smoke.

The present invention solves these problems and aims to provide an aluminum electrolytic capacitor that can prevent the gas of the driving electrolyte from flowing out.

Means for Solving the Problems In order to achieve the above object, the aluminum electrolytic capacitor of the present invention includes a capacitor element impregnated with a driving electrolyte, a bottomed cylindrical metal case containing the capacitor element,
a pair of lead wires derived from the capacitor element;
A space is provided above the explosion-proof valve provided on the top plate of the metal case, and includes a pair of external connection terminals connected to the pair of lead wires and a sealing member that seals the opening of the metal case. and install multiple baffle boards within this space!
However, holes are provided alternately in the plurality of baffle plates, and an absorbent material having the effect of absorbing the electrolyte is placed outside the baffle plates.

Function According to the above structure, a space is provided above the explosion-proof valve provided on the top plate of the metal case, and a plurality of baffle plates are installed in this space, and the baffle plates are arranged alternately. Since holes are provided and an absorbing material is placed outside the baffle plate, which has the effect of absorbing electrolyte, abnormal stress such as overvoltage is applied to the aluminum electrolytic capacitor.
Even if the explosion-proof valve operates and gas from the internal drive electrolyte blows out from the explosion-proof valve part of the metal case, most of the drive electrolyte gas hits the multiple baffle plates and is cooled, liquefies and explodes into the metal. The remaining driving electrolyte gas that falls onto the top plate of the case and passes through the holes provided alternately in the plurality of baffle plates is further collected by a collecting material installed outside of the baffle plates. As a result, the driving electrolyte will not leak outside.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings. In FIG. 1, reference numeral 1 denotes a capacitor element, and this capacitor element 1 is constructed by forming a dielectric oxide film on the surface of a roughened aluminum foil and winding this together with a separator.

This capacitor element 1 is impregnated with a driving electrolyte, and is installed in a bottomed cylindrical metal case 2 made of aluminum. A pair of lead wires 3, 3a made of aluminum are led out from the capacitor element l, and the pair of lead wires 3, 3a are led out from the capacitor element l.
, 3a are connected to a pair of external terminals 4, 4a by caulking at a portion of a sealing member 5 made of a terminal plate. The sealing member 5 made of the terminal plate is disposed at the opening of the metal case 2, and seals the opening of the metal case 2 by sealing the open end of the metal case 2. Further, the top plate portion 2a of the metal case 2 is formed with an explosion-proof valve 6 made of a thin portion which is a weak point.

A space 8 is provided above the explosion-proof valve by fixing a fixing jig 7 to the top plate 2a side of the metal case 2, and a plurality of baffle plates 9 are provided within this space 8. The baffle plates 9 are installed at intervals, and the plurality of baffle plates 9 are provided with small holes 9a alternately. Also, on the outside of this baffle plate 9, there is an absorbing material 1 that has the effect of absorbing the driving electrolyte.
0 is set. As the material for this absorbent material 10, for example, glass fiber, porous polymer, filter paper, nonwoven fabric, etc. are used. Note that the nonwoven fabric of the filter paper 3 may be used after being subjected to flame retardant treatment.

The operation in the above configuration will be explained. When an overvoltage higher than the rated value is applied to this aluminum electrolytic capacitor, the internal pressure of the metal case 2 increases, which causes the explosion-proof valve 6 provided on the top plate 2a of the metal case 2 to operate, causing the internal drive The electrolytic solution will be ejected from this explosion-proof valve 6 section. in this case,
Most of the gas in the driving electrolytic solution hits the plurality of baffle plates 9 and is cooled, liquefies, and falls onto the top plate portion 2a of the metal case 2. In addition, the remaining driving electrolyte gas exits through the small holes 9a provided in the baffle plate 9, but these gases are absorbed by the absorber 10 installed outside the baffle plate 9, so that the driving electrolyte gas This can prevent gas from flowing out of the capacitor.

Effects of the Invention As is clear from the description of the embodiments above, according to the aluminum electrolytic capacitor of the present invention, a space is provided above the explosion-proof valve provided on the top plate of the metal case, and a plurality of Aluminum electrolytic capacitors are equipped with baffle plates, holes are provided alternately in each of these baffle plates, and an absorbent material is placed outside the baffle plates to absorb electrolyte. Even if an abnormal stress such as overvoltage is applied to the explosion-proof valve and the internal drive electrolyte gas blows out from the explosion-proof valve part of the metal case, most of the drive electrolyte gas will It is cooled by hitting the baffle plate of
It will liquefy and fall onto the top plate of the metal case,
The remaining driving electrolyte gas that has passed through the holes provided alternately in the plurality of baffle plates is further absorbed by the absorbent material installed outside of these baffle plates, and as a result,
This can prevent the driving electrolyte from flowing out of the capacitor.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an aluminum electrolytic capacitor showing one embodiment of the present invention. 1...Capacitor element, 2...Metal case, 2a...Top plate part, 3, 3a...
A pair of lead wires, 4.4a... A pair of external connection terminals, 5... Sealing member, 6... Explosion-proof valve,
8... Space part, 9... Baffle plate, 9a.
...hole, 10...absorbent material.

Claims (1)

[Claims] A capacitor element impregnated with a driving electrolyte, a bottomed cylindrical metal case containing the capacitor element, a pair of lead wires led out from the capacitor element, and a pair connected to the pair of lead wires. and a sealing member for sealing the opening of the metal case, a space is provided above the explosion-proof valve provided on the top plate of the metal case, and a plurality of An aluminum electrolytic device characterized in that a baffle plate is installed, holes are provided alternately in the plurality of baffle plates, and an absorbent material having the effect of absorbing electrolyte is placed outside the baffle plate. capacitor.