JPS5915378B2 - Manufacturing method of solid electrolytic capacitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for manufacturing a solid electrolytic capacitor.

In general, solid electrolytic capacitors are made by press-molding metal powders such as tantalum, niobium, aluminum, etc. that have a valve action into a cylindrical shape and sintering them, as shown in Figure 1. Anode lead B, a metal wire with valve action.

B2, and this anode lead B2. The lead members C1 and C2 bent in an L shape are attached to the protruding portion of B2, and the electrode lead layer D1. D2 are welded so that they are in contact with each other, and the electrode lead layer 1. B2, and then each capacitor element A1. The entire circumferential surface of A2 is covered with resin material E.

By the way, in the manufacturing process of this capacitor, for example, as shown in FIG.
1s A2, the anode lead B, , 82k, each electrode lead layer D1. Although the anode leads B1.D2 are welded so that they are in contact with each other, the pitch interval between the lead members C2 and C2 is easily disturbed due to handling during the manufacturing process. Since it is necessary to correct the pitch interval before welding B2 to the lead members CI and C2, there is a drawback that workability is significantly reduced.

In view of these points, the present invention is directed to manufacturing a solid electrolytic capacitor that suppresses deformation and pitch disturbance of lead members due to handling during the manufacturing process, and significantly improves the connectivity of the anode lead extending from the capacitor element to the lead member. The manufacturing method will be described below with reference to FIG.

First, as shown in Figure a, a strip plate 1 made of a metal plate, for example.
U-shaped lead members 2 are welded at regular pitch intervals.

Next, as shown in the same figure, a capacitor element 3 made of metal powder having a valve action and formed by pressure molding into a cylindrical shape and sintering,
Anode leads 4, 4 extending from 3 are placed on the bottom part 2a of the lead member 2, and an oxide layer is placed on the circumferential surface of the capacitor elements 3, 30.
Welding is performed so that the electrode lead layers 5, 5 formed through the Sakae conductor layer are in contact with each other.

In this state, the capacitor elements 3, 3 are immersed in a molten solder bath, and the respective electrode lead layers 5, 5 are electrically and mechanically connected by the solder layer 6.

Next, as shown in FIG. 3C, a cutout 2b is formed at the bottom 2a between the connection portions of the anode leads 4, 4 to the lead member 2.

Then, the entire circumferential surface of the capacitor elements 3, 3 is covered with the resin material 1.

Thereafter, the solid electrolytic capacitor shown in FIG. 4D is obtained by cutting the lead member 2 along the line X--X.

In this way, the lead member 2 is formed into a U-shape and its free end is welded to the strip plate 1, so even if a lateral pressing force is applied during handling in the manufacturing process, the presence of the bottom portion 2a Not easy to deform.

For this reason, the pitch of the lead members 2 is kept normal, and the connectivity of the anode leads 4, 4 of the capacitor elements 3, 3 to the bottom portion 2a can be significantly improved.

Further, the cutting operation of the bottom side 2a of the lead member 2 is performed by cutting the bottom side 2a of the lead member 2.
aVC capacitor elements 3, 3 anode leads 4, 4
This is done after welding the lead members 2 and 5 and electrically and mechanically connecting and fixing the electrode lead layers 5, 5 with the solder layer 6, so that pressing force etc. are applied when cutting the lead members 2. Anode lead 4,
4 will not be deformed or the capacitor elements 3, 3 will not be separated.

In particular, if the bottom portion 2a is cut off after being preliminarily covered with a resin material so that the connecting portion between the leads 4, 4 and the bottom portion 2a is exposed, the capacitor elements 3, 3 of the leads 4, 4 can be removed. It is possible to effectively reduce property deterioration due to cracks in the oxidized layer at the implanted part.

FIG. 4 shows another embodiment of the chain lead structure according to the present invention, in which the U-shaped lead member 2 is made of the same material as the strip plate 1, and is formed, for example, by punching.

According to this embodiment, the pitch between the lead members 2 can be made more accurate, and deformation and pitch disturbance due to handling can be prevented.

As described above, according to the present invention, deformation and pitch disturbance of the lead member due to handling during the manufacturing process can be suppressed,
The connectivity of the anode lead of the capacitor element to the lead member can be significantly improved.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of a conventional solid electrolytic capacitor, FIG. 2 is a front sectional view for explaining the manufacturing method, FIG. 3 is a front view or front sectional view for explaining the method of the present invention, and FIG. The figure is a front view showing another embodiment of the chain lead structure according to the present invention. In the figure, 1 is a strip plate, 2 is a lead member, 2a is a bottom part, 2b
3 is a cutout portion, 3 is a capacitor element, 4 is an anode lead, 5 is an electrode lead layer, 6 is a solder layer, and 1 is an exterior member (resin material).

Claims (1)

[Claims] 1. A metal powder having a valve action is pressure-molded into a desired shape and sintered at the bottom of a U-shaped lead member that extends integrally from the strip plate, and then a plurality of capacitor elements and an anode lead that extends from the strip are formed. A process of connecting the electrode lead layers formed in advance on the circumferential surface of each capacitor element via an oxide layer and a conductor layer so that they are almost in contact with each other, and in this state, immersing a plurality of capacitor elements in a molten solder bath. a step of electrically and mechanically connecting each electrode lead layer by pulling it up; and after this step, a step of forming a cutout at the bottom of the lead member between the connecting portions of the anode lead; 1. A method for manufacturing a solid electrolytic capacitor, comprising a step of commonly sheathing elements.