JPS62276817A - 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 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to aluminum electrolytic capacitors, and more specifically, to improvements in capacitor elements used in aluminum electrolytic capacitors.

Conventional technology Conventional aluminum electrolytic capacitors consist of an anode foil made by roughening high-purity aluminum foil to expand its surface area and then forming a dielectric oxide film through anodization, and a cathode foil made by roughening aluminum foil. The capacitor element was wound together with a separator and impregnated with a driving electrolyte to form a capacitor element, and the capacitor element was housed in a bottomed cylindrical case, and the open end was sealed with a sealing body to complete the finished product.

In such a conventional aluminum electrolytic capacitor, the capacitor element includes a cathode foil 1, as shown in FIGS. 8 and 9. It was constructed by winding a cathode foil 2 with a separator 3 in between, and wrapping an adhesive tape 4 around the upper part of the outer circumference to prevent unwinding.

Problems to be Solved by the Invention In such conventional aluminum electrolytic capacitors, as the total length of the capacitor element increases, as shown in FIG. 3 is likely to form a folded part 5, and damage may occur from this folded part 5. After impregnating with driving electrolyte,
When the sealing bodies are combined and housed in a bottomed cylindrical case, they tend to get caught on the open end, which is a major impediment to improving productivity, especially production speed.

In such a case, as shown in FIGS. 11 and 12, at least two
The adhesive tape 4 is wound more than once, or over the entire area of the capacitor element.

However, these methods have disadvantages in that the cost of the adhesive tape 4 is large, the structure of the winding machine is complicated, and the number of man-hours is increased.

The present invention solves these problems and provides a capacitor element that does not require increasing the width of the adhesive tape or wrapping multiple pieces of adhesive tape to prevent unwinding even if the overall length of the capacitor element becomes longer. This is what we provide.

Means for Solving the Problems In order to solve the above problems, the present invention provides an anode foil and a cathode foil in which the surface of high-purity aluminum foil is electrochemically roughened and a dielectric oxide film is formed by positive chemical formation. is wound together with a separator, the cathode foil wound longer than the anode foil and the final end of the separator are cut diagonally, and the protrusion of this cut is wrapped with adhesive tape to prevent unwinding to form a capacitor element. It is something to do.

Effect: With this configuration, the folded portion is removed in advance, and folding can be prevented from occurring.

Example An embodiment of the present invention will be described below.

As shown in FIGS. 1 to 3, an anode foil 6 and a cathode foil 7, which are made by electrochemically roughening high-purity aluminum foil and forming a dielectric oxide film by anodization, are wound together with a separator 8, and the anode The final ends of the cathode foil 7 and separator 8, which are wound longer than the foil 6, are cut diagonally from the upper right to the lower left, and the adhesive tape 9 to prevent unwinding is wrapped around the upper part of the cut part where the protruding part is located. An element 1o is formed.

Anode foil 6 of this capacitor element 10. Output leads 11 and 12 are drawn out from the cathode foil 7, and the capacitor element 1o is impregnated with a driving electrolyte and housed in a bottomed cylindrical case 13 made of aluminum or the like. A sealing body 16 having terminals 14 and 15 for connecting the capacitors 12 and 12 is sealed to the opening of the case 13 to form an aluminum electrolytic capacitor.

Moreover, as shown in FIGS. 4 and 5, the capacitor element 1o
As opposed to the above-mentioned embodiment, the cathode foil 7 and the separator 8
The final end of the capacitor element 1Q is cut diagonally from the upper left corner to the lower right corner, and an adhesive tape 9 to prevent unwinding is wrapped around the lower part of the capacitor element 1Q to form a capacitor element 10.

Alternatively, the final ends of the cathode foil 7 and the separator 8 can be cut perpendicularly to the width of the tape 1j only at the part where the adhesive tape 9 is wrapped, and the other parts cut diagonally; the effect is the same, and the method is Examples are shown in FIGS. 6 and 7.

Effects of the Invention According to the present invention, even if the total length of the capacitor element becomes longer, the number of adhesive tapes used to prevent the capacitor element from unwinding can be increased, and adhesive tape with a wider width can be used. This eliminates the need for this method, prevents an increase in tape material costs, requires a simple design of the winding machine, and does not increase the number of man-hours, which is of great industrial value and greatly contributes to cost and productivity.

[Brief explanation of the drawing]

Fig. 1 is a sectional front view showing one embodiment of an aluminum electrolytic capacitor of the present invention, Fig. 2 is a perspective view of a capacitor element used in the capacitor, Fig. 3 is an exploded perspective view of the capacitor element, and Fig. 4 is a perspective view of the capacitor element used in the capacitor. Perspective view of a capacitor element of another embodiment, No. 5
The figure is an exploded perspective view of the same capacitor element, Figures 6 and 7 are button views of other capacitor elements, and Figure 8 is a perspective view of a capacitor element used in a conventional aluminum electrolytic capacitor.
Figure 9 is an exploded perspective view of the same capacitor element, Figure 1Q is a perspective view showing problems with the same capacitor element, Figure 11, Figure 1
FIG. 2 is a 1,+ view showing another conventional capacitor element. 6... Anode foil, 7... Cathode foil, 8... Separator, 9... Adhesive tape, 10... Capacitor element, 13... Case, 16 ...Sealed body. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Foil 3 Figure 4 Figure 5 Figure 6 Figure 7 Chopsticks 8 Figure 9 Figure 10 Mouth 11 Figure 12

Claims (1)

[Claims] The anode foil and cathode foil, which are made by roughening high-purity aluminum foil and forming a dielectric oxide film through anodizing, are wound together with a separator, the final end is cut diagonally, and an adhesive tape is wrapped to prevent unwinding. An aluminum electrolytic capacitor that consists of a capacitor element, impregnated with a driving electrolyte, housed in a bottomed cylindrical case, and sealed with a sealing body at the open end of the case.