JPS5855644Y2 - Electrolytic capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a capacitor element in a rectangular electrolytic capacitor.

In the past, most electrolytic capacitors were cylindrical because they were easy to work with when winding the capacitor element and sealing the case, but as electronic devices have become smaller and more dense, It has been pointed out that the space factor is extremely poor when two or more cylindrical electrolytic capacitors are arranged side by side or when installed side by side with other parts.

For this reason, it is being considered to increase the space factor by making electrolytic capacitors square, but simply housing a cylindrically wound capacitor element in a square case would result in a poor space factor for the capacitor element itself.
Another drawback is that there is a large gap between the case and the case, making it vulnerable to vibrations.

Furthermore, when winding a capacitor element, even if the winding core is made into a prismatic shape as shown in Figure 1, the diameter will be larger to some extent due to the thickness of the anode foil, cathode foil, and separator used as electrodes. In this case, the capacitor element becomes round, and as shown in Figure 2, even if the prismatic winding core is made larger, the diameter of the capacitor element will increase by that amount. There were many difficulties in the process.

In addition, in FIG. 1 and FIG. 2, 1 is a prismatic winding core;
2 is an element structure in which a separator is interposed between an anode foil and a cathode foil.

The present invention has been developed in view of these conventional problems, and will be described below with reference to FIGS. 3 to 8, which show embodiments of an electrolytic capacitor according to the present invention.

Fig. 3 shows a capacitor element used in an electrolytic capacitor according to an embodiment of the present invention. In the figure, 3 is a prismatic winding core, 4 is a separator interposed between an anode foil and a cathode foil. 5 is a hollow prismatic spacer made of an insulator disposed in the middle of the winding of the element structure 4, and as shown in FIG. is open.

That is, in the present invention, the element structure 4 is wound a predetermined number of times around the winding core 3 so as not to form a circular shape, and the spacer 5 is arranged around the wound material.
A capacitor element is constructed by pulling the element structure 4 outside through the opening and further winding it around the spacer 5.Even if the diameter becomes large to some extent, it can be easily wound into a prismatic shape. It is possible to obtain a rectangular capacitor element with a good space factor for a rectangular case.

Note that as the spacer, a spacer 6 having a U-shaped cross section as shown in FIG. 5 may be used.

Furthermore, the material for the spacers 5 and 6 is preferably plastic, which has excellent heat resistance and chemical resistance.

Further, FIG. 6 shows a capacitor element used in an electrolytic capacitor according to another embodiment of the present invention.
The embodiment shown in the figure is an example in which a capacitor element with a large diameter is obtained, and one spacer 5 is disposed on the outside every time the element structure 4 is wound a predetermined number of times.

Therefore, even if the diameter becomes large, the condenser element can be reliably formed into a rectangular shape.

7 and 8 each show an example in which the capacitor elements shown in the above embodiments are used to form an electrolytic capacitor, and FIG. 7 shows an example in which four capacitor elements 7 are arranged side by side. FIG. 8 shows an example in which three capacitor elements 7 are stacked on a fir tree, 8 is an external terminal, and 9 is an exterior body.

As described above, according to the present invention, a plurality of rectangular capacitor elements 7 can be combined into one electrolytic capacitor, and in this case as well, the space factor can be improved.

As described above, the electrolytic capacitor according to the present invention can obtain a rectangular product with a good space factor with a simple structure that just incorporates a space, and the size does not increase so much, which meets the current requirements. Electrolytic capacitors can be provided.

[Brief explanation of the drawing]

FIGS. 1 and 2 are schematic diagrams of a capacitor element used in a conventional electrolytic capacitor, FIG. 3 is a schematic diagram of a capacitor element used in an electrolytic capacitor according to an embodiment of the present invention, and FIGS. Figure 5 is a perspective view showing an example of a spacer used in the same capacitor element, respectively.
FIG. 6 is a schematic view of a capacitor element used in an electrolytic capacitor according to another embodiment of the present invention, and FIGS. 7 and 8 are perspective views respectively showing the interior of the electrolytic capacitor according to the present invention. 3... Winding core, 4... Element structure, 5,
6... Spacer, 7... Condenser element.

Claims (1)

[Scope of utility model registration request] In an electrolytic capacitor, in which a capacitor element is constructed by winding an anode foil and a cathode foil with a separator interposed between them, an insulating material is wound around a prismatic core and has one side open in the middle. An electrolytic capacitor consisting of a prismatic capacitor element with a hollow prismatic spacer interposed therebetween.