JPS6356698B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrolytic capacitor with improved impedance.

As shown in Figure 1, conventional electrolytic capacitors are constructed by connecting the lead plate 2 to the anode foil and the cathode foil by caulking or other methods, and then winding it through electrolytic paper and fixing the end of the winding with tape. Then, the capacitor element 3 is formed. Next, the element 3 is impregnated with an electrolytic solution, and the external terminal 1, which has been attached to the sealing plate 4 in advance, is connected to the lead plate 2 using rivets, etc., and the element 3 is inserted into a case 5 made of aluminum or the like. The opening is sealed tightly.

Conventionally, in the above-mentioned capacitor, in order to reduce the impedance, the number of lead plates is increased. Lowers the specific resistance of electrolytes, etc. Efforts were being made to reduce the thickness and density of electrolytic paper. However, with these methods, there is a limit to the reduction in impedance, and the structure becomes complicated and expensive.

The present invention eliminates the above-mentioned drawbacks, has a simple structure,
The present invention also aims to provide an electrolytic capacitor whose impedance characteristics can be significantly improved.

The present invention will be described below with reference to embodiments shown in FIGS. 2 to 8.

A lead tab 6 made of aluminum having a flat portion 6a is formed into a U-shape, and external lead wires 7, 7 are welded to both ends of the lead tab 6, and a terminal 8 is connected to the second terminal 8.
As shown in the figure. The terminal 8 is inserted into the terminal through-hole provided in the sealing plate 9 made of rubber bake or resin, and the external lead wire 7 is inserted into the through-hole of the upper mold 14 as shown in FIG. 14 on the upper surface of the lead tab 6 forming the terminal 8, and
The lower mold 15 is brought into contact with the lower surface of the cylinder excluding the flat part 6a of the lead tab 6 forming the lead tab 6, and the upper mold 14 is pressed in the direction of the arrow to crush both ends of the lead tab 6 as shown in FIG. After being attached and fixed to the sealing plate 9, a capacitor element 10 prepared in advance and impregnated with electrolyte is drawn out from both end faces of the capacitor element 10 in the opposite direction as shown in FIG. 6 on the flat part 6a of the terminal 8. A plurality of capacitor elements 10 are connected to the lead plates 11 and 11 by ultrasonic welding as shown in FIG. The structure was welded and sealed using methods such as ultrasonic welding and thermal welding, and was completed as shown in FIG. 13 is the flat part 6a and the drawer lead plate 11
This is the connection part with.

When the terminal 8 with the lead tab 6 and the external lead wire 7 welded together is press-fitted to the sealing plate 9 as described above, the upper mold 14 and the lower mold 15 are used as shown in FIG. Since the external lead wire 7 is inserted into the through hole of the mold 14 so as not to be subjected to impact during press mounting, the welded portion between the lead tab 6 and the external lead wire 7 is prevented from being damaged or disassembled.

In order to facilitate connection of the lead plate 11 led out from the capacitor element 10, the above-mentioned lead tab 6 has a flat connecting portion 6a, and has a predetermined thickness of 1 mm or more so that the capacitor element 10 can be attached and fixed. Choose thickness.

Since the present invention is constructed as described above, the structure is simple and mass-producible, and the impedance can be easily reduced. Moreover, since it can be manufactured into a rectangular or flat shape, it has the advantage that it can be set compactly even when used in a device.

Next, FIG. 9 shows data comparing the impedance characteristics of an electrolytic capacitor (50 WV, 1000 μF) manufactured according to the configuration of the present invention and a conventional electrolytic capacitor (50 WV, 1000 μF). As is clear from FIG. 7, the effect of the electrolytic capacitor of the present invention becomes noticeable above 10 KHz, and it can be seen that the impedance at high frequencies is significantly improved.

As described above, the present invention can be mass-produced using capacitor elements with a simple structure, and includes a lead plate led out from a plurality of capacitor elements and a flat part of a terminal attached to a sealing plate and having two lead parts. This electrolytic capacitor is made by connecting the capacitors with ultrasonic welding and sealing them in a case.It is easy to manufacture low-impedance products, and it can be mass-produced using existing equipment, making it highly cost-effective. , has great industrial and practical value.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional electrolytic capacitor, Figure 2 is a cross-sectional view of a conventional electrolytic capacitor.
Figures 8 to 8 show an embodiment of the present invention. Figure 2 is a perspective view of the terminal, Figure 3 is a front view of the terminal inserted into the sealing plate, and Figure 4 is the front view of the sealing plate with the terminal attached. figure,
Figure 5 is a perspective view of the sealing plate with terminals attached;
The figure is a perspective view of a capacitor element, Figure 7 is a perspective view of an electrolytic capacitor in the assembly process, Figure 8 is a perspective view of a completed electrolytic capacitor, and Figure 9 is an impedance characteristic diagram comparing a conventional product and a product of the present invention. It is. 6: lead tab, 6a: flat part, 7: external lead wire, 8: terminal, 9: sealing plate, 10: capacitor element, 11: lead plate, 12: case,
14: Upper mold, 15: Lower mold.

Claims (1)

[Claims] 1 A lead tab 6 made of aluminum having a flat part 6a is formed into a U-shape, and external lead wires 7, 7 are welded to both ends of the lead tab 6, and two terminals 8, 8 are sealed with rubber baking or resin. Insert it into the terminal through hole provided in the plate 9 and press it.
An electrolytic capacitor is formed by welding lead plates 11, 11 led out in opposite directions from both end faces of a plurality of capacitor elements 10 to the flat parts 6a, 6a of the terminals 8, 8, respectively, and storing and sealing them in a case 12.