JPH05243103A - Manufacture of electrolytic capacitor - Google Patents

Abstract

PURPOSE:To provide the method for manufacture of a double structure electrolytic capacitor having excellent workability, no irregularity in depth of transverse contraction and transverse contraction in a safety case. CONSTITUTION:In the method for manufacture of an electrolytic capacitor in which an electrolytic capacitor main body A, in which a capacitor element 1 is housed in a bottomed cylindrical outside case 3 and the upper aperture is sealed by a sealing plate 6, is housed in a bottomed cylindrical safety case 8 having the upper part sealed by the second sealing plate 9, the aperture of the safety case 8 is sealed by the second sealing plate 9 after the electrolytic capacitor main body A has been inserted into the safety case 8 on which a transverse contraction 10 is formed in advance on the electrolytic capacitor main body A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electrolytic capacitor, and more particularly to a method for manufacturing a double structure aluminum electrolytic capacitor.

[0002]

2. Description of the Related Art An aluminum electrolytic capacitor is provided with a capacitor element in which an anode foil and a cathode foil made of aluminum foil are wound with a separator between them and impregnated with a predetermined electrolytic solution. The capacitor element is housed in a cylindrical case having a bottom and made of, for example, aluminum, and its opening is hermetically closed by a sealing plate.

By the way, a reverse voltage is applied to this electrolytic capacitor,
When an overvoltage or an excessive temperature is applied, the internal gas is generated due to the decomposition of the electrolytic solution, the internal pressure may rise, and the battery may explode. Further, since the internal pressure may rise abnormally due to other causes, conventionally, an explosion-proof valve that releases the internally generated gas to the outside when the specified internal pressure is reached is provided in the sealing plate or the like.

Although the explosion of the electrolytic capacitor is prevented by the operation of the explosion-proof valve, the generated gas may be mistaken for a fire of the set (equipment), which may give the user an uncomfortable feeling. With the generated gas, the electrolytic solution may scatter around and cause a short circuit.

Therefore, there is a double structure in which the entire electrolytic capacitor is housed in a safety case as shown in FIG. In FIG. 3, the electrolytic capacitor main body D has an outer case 20 made of aluminum and having a cylindrical shape with a bottom, and a capacitor element 21 housed in the outer case. -Fixed inside the case 20, the opening of the outer case 20 has an anode terminal 23a and a cathode terminal 2
It is sealed by a sealing plate 24 having 3b. An explosion-proof valve 25 formed of a hole is provided at a substantially central portion of the sealing plate 24.

Inside the case of the anode terminal 23a and the cathode terminal 23b, the anode lead 26a and the cathode lead 26b drawn out from the capacitor element 21 are connected, and the case of each terminal 23a, 23b. Internal lead wires 27a and 27b are connected to the outer side of the sleeve, which are easily broken when pulled.

The whole electrolytic capacitor main body D is housed in a bottomed cylindrical safety case 28 made of aluminum, and the upper opening of the safety case 28 is hermetically sealed by a second sealing plate 29. It is sealed by. The second sealing plate 29 is provided with a pair of lug-type terminals 30a and 30b as external terminals. The lug-type terminals 30a and 30b are the internal lead wires 27.
a and 27b, respectively. Safety case 2
8 are provided with horizontal diaphragms 31 at two locations all around,
The vibration resistance of the electrolytic capacitor body D in the safety case 28 is enhanced, and the space in the safety case 28 is airtightly divided into an upper space E above the electrolytic capacitor body D and a bottom space F below. ing.

When the internal pressure in the outer case 20 rises for some reason and the explosion-proof valve 25 operates, the gas generated in the electrolytic capacitor body D is jetted into the upper space E of the safety case 28. As a result, the pressure in the upper space E increases, and the electrolytic capacitor body D moves vigorously toward the bottom space F side of the safety case 28, and along with this, the internal lead wires 27a,
27b is cut. The generated gas is confined in the upper space E and does not leak to the outside of the safety case 28.

[0009]

However, in the double-structured electrolytic capacitor in which the electrolytic capacitor body D is housed in the safety case 28 as described above, the electrolytic capacitor body D is first used for safety in the manufacturing process. The horizontal diaphragm 31 is inserted after the safety case 28 is sealed in the case 28, but since the horizontal diaphragm 31 is inserted later, workability is poor and the depth of the horizontal diaphragm is not uniform in each product. In some cases, the horizontal diaphragm does not come into contact with the electrolytic capacitor body D, and therefore, the upper space E and the lower bottom space F may not be hermetically separated from each other. In addition, the horizontal diaphragm 31 may be too deep and may damage the electrolytic capacitor body.

The present invention provides a method of manufacturing a double structure electrolytic capacitor having a horizontal draw in a safety case, which has good workability in manufacturing and has no variation in the depth of the horizontal draw in each product. It is an object.

[0011]

In order to achieve this object, according to the present invention, an electrolytic capacitor in which a capacitor element is housed in an outer case having a cylindrical shape with a bottom and an upper opening is sealed with a sealing plate. In a method of manufacturing an electrolytic capacitor, the main body of which is housed in a safety case having a cylindrical shape with a bottom and an upper part of which is sealed by a second sealing plate. After being inserted into the safety case, the opening of the safety case was sealed with the second sealing plate.

[0012]

EXAMPLE FIG. 1 shows a schematic side sectional view of an electrolytic capacitor according to an embodiment of the present invention during a manufacturing process, and FIG. 2 shows a schematic side sectional view of an electrolytic capacitor after completion of manufacturing. There is. The electrolytic capacitor body A includes a capacitor element 1 formed by winding, for example, an aluminum foil anode foil and a cathode foil with a separator interposed therebetween. From this capacitor element 1, a ribbon-shaped anode lead 2a and cathode lead 2 are formed.
b is pulled out. After being impregnated with a predetermined electrolytic solution, the capacitor element 1 is housed in an outer case 3 made of, for example, aluminum and having a bottomed cylindrical shape. The capacitor element 1 is fixed in the outer case 3 with an appropriate fixing agent 4,
The opening of the outer case 3 is sealed by a sealing plate 6 having an anode terminal 5a and a cathode terminal 5b.

The anode terminal 5a and the cathode terminal 5b are made of aluminum rivets, and the case of each of the terminals 5a and 5b is formed.
An anode lead 2a and a cathode lead 2b are connected to the inside of the sleeve. Further, rigid inner lead wires 7a and 7b are welded to the outsides of the cases of the terminals 5a and 5b, respectively, which are easily broken when pulled. The sealing plate 6 is made of, for example, a rubber-clad laminated plate in which an elastic film such as rubber is attached to the upper surface of the Bakelite plate, and the explosion-proof valve 6a made of a hole is provided at substantially the center of the Bakelite plate. ing. The side portion of the sealed electrolytic capacitor main body A is covered with, for example, a polyolefin tube 3a in order to enhance airtightness with a lateral diaphragm 10 of a safety case 8 described later.

The electrolytic capacitor body A is housed in a safety case 8 having a bottomed cylindrical shape. The safety case 8 is made of, for example, aluminum, and the upper opening of the safety case 8 is hermetically sealed by the second sealing plate 9. The second sealing plate 9 has a pair of external terminals, in this embodiment, the lug type terminals 1.
1a and 11b are provided. In this case, the lug terminals 11a, 11b are preferably made of solderable metal, for example, copper rivets, each of which has an insertion hole for inserting the internal lead wires 7a, 7b acting as fuse wires. Has been drilled. That is, each internal lead wire 7a, 7b is soldered in a state of being inserted into the insertion hole. The second sealing plate 9 is made of the same rubber-clad laminate as the sealing plate 6.

On the side of the safety case 8 are two lateral diaphragms 1.
0 is formed in advance. The depth of the lateral diaphragm 10 allows insertion of the electrolytic capacitor A, and further, the electrolytic capacitor main body A so that the upper space B and the bottom space C are kept airtight.
The tube 3a has a depth that abuts or slightly bites into the tube 3a.

To manufacture the electrolytic capacitor of the present invention,
First, the electrolytic capacitor body A is manufactured. That is, the electrolytic capacitor 1 is housed and fixed in the outer case 3, the opening is closed by the sealing plate 6, and the tube 3a is covered. After that, the lug-type terminals 11a and 11b of the second sealing plate 9 of the safety case 8 are connected to the ends of the fuse wires 7a and 7b, and the electrolytic capacitor body A is connected to the second sealing plate 9 of the safety case 8. Connect.
On the other hand, the lateral diaphragm 10 is formed on the side portion of the safety case 8 with the upper part opened.

Next, the electrolytic capacitor body A of the safety case 8 to which the second sealing plate 9 is connected is inserted from above the safety case 8 as shown by the arrow, and then the opening of the safety case 8 is opened. The second sealing plate 9 is used for sealing. The lateral diaphragm 10 of the safety case 8 abuts or slightly digs into the tube 3a of the electrolytic capacitor body A, and the upper space B and the bottom space C are divided above and below the electrolytic capacitor body A in the safety case 8, respectively. It is formed.

The operation of the electrolytic capacitor will be described. First, when the internal pressure in the outer case 3 rises and the explosion-proof valve 6a is actuated for some reason, the gas generated in the electrolytic capacitor body A is placed above the safety case 8. Spout into space B. At this time,
Since the upper space B and the bottom space C are separated by the horizontal diaphragm 10, the safety case 8 is formed by the generated gas.
The pressure in the upper space B is surely increased. As a result, the electrolytic capacitor body A moves vigorously toward the bottom side of the safety case 8, and accordingly, the internal lead wire 7
Both or one of a and 7b is cut. The generated gas is confined in the upper space B and does not leak to the outside of the safety case 8.

The horizontal diaphragm 10 may be provided in two or more pieces, or may be one piece. The tube 3a is not always essential. Further, without connecting the electrolytic capacitor body A and the second sealing plate 9 in advance, the electrolytic capacitor body A is first inserted into the safety case 8, and then the second sealing plate 9 is connected to the electrolytic capacitor body A. Internal lead wires 7a, 7b
, And the safety case 8 may be sealed with the sealing plate 9.

[0020]

As described above, according to the present invention,
Since the horizontal throttle is formed in advance in the safety case, it is easy to form the horizontal throttle, and the depth of the horizontal throttle can be made constant, and the horizontal throttle securely contacts the electrolytic capacitor body to improve vibration resistance. Moreover, the airtightness between the upper space and the bottom space can be enhanced.

[Brief description of drawings]

FIG. 1 is a schematic sectional side view of an electrolytic capacitor according to an embodiment of the present invention during a manufacturing process.

FIG. 2 is a schematic side sectional view of the electrolytic capacitor after completion of manufacturing in FIG.

FIG. 3 is a schematic side sectional view of a conventional electrolytic capacitor.

[Explanation of symbols]

 1 Capacitor element 2a Anode lead 2b Cathode lead 3 Exterior case 3a Tube 5a Anode terminal 5b Cathode terminal 6 Seal plate 6a Explosion proof valve 7a Inner lead wire 7b Inner lead wire 8 Safety case 9 Second seal plate 10 Horizontal diaphragm 11a Lug type terminal 11b Lug type terminal

Claims (1)

[Claims] 1. An electrolytic capacitor body in which a capacitor element is housed in an outer case having a cylindrical shape with a bottom and an upper opening is sealed with a sealing plate. In the method of manufacturing an electrolytic capacitor housed in a safety case sealed by, after inserting the electrolytic capacitor body into a safety case in which a lateral diaphragm is previously formed on the side,
A method of manufacturing an electrolytic capacitor, characterized in that an opening of a safety case is sealed with the second sealing plate.