JPS6322052B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrolytic capacitor with an improved separator inserted between an anode foil and a cathode foil, and is intended to achieve small size and high performance.

Generally, an electrolytic capacitor is wound with a separator 3 such as electrolytic paper inserted between an anode foil 1 and a cathode foil 2, as shown in Figure 1, but in order to make it smaller, the electrolytic paper is thinner. Moreover, when a low-density foil is used, the burrs at the cut portion of the foil pierce the electrolytic paper at the beginning or end of the winding, resulting in short circuits. To this end, attempts have been made to create paper made by mixing the same or different types of natural fibers, such as kraft paper and manila paper, rayon fiber and manila paper, and paper made by mixing natural fibers and chemical fibers. 1977-
No. 366). However, since the paper is mixed, pinholes occur due to gaps and unevenness, and it is difficult to make the thickness and density uniform, making it almost impossible to completely prevent mechanical short circuits.

The present invention eliminates the above-mentioned drawbacks and provides an electrolytic capacitor that is inexpensive, compact, and has high performance.

That is, in an electrolytic capacitor formed by winding a separator formed by laminating chemical fibers and natural fibers, or one of them, between electrodes and impregnating the separator with an electrolytic solution, liquid is present between the fibers of the separator. This electrolytic capacitor is characterized in that it is laminated with an adhesive containing a conductive material such as a solid electrolyte.

The present invention will be described below with reference to an embodiment shown in FIG.

FIG. 2 is a sectional view of a separator according to the present invention,
4 is a chemical fiber such as rayon or vinylon, 5 is a natural fiber such as kraft paper or manila paper, and the fibers are bonded together using an adhesive 6 containing a conductive material such as liquid or solid electrolyte. has been configured. A, B, H, and D are laminated chemical fibers 4 and natural fibers 5, 4' is a hole to further improve impregnation, and E and F are laminated fibers of one of the above. , each fiber layer is bonded with the adhesive 6 described above. Further, as the electrolyte, a known low resistance electrolyte made of ethylene glycol, TCNQ complex compound, etc. is used, and this is mixed with the adhesive.

This separator is interposed between the electrode foils, and the separator is wound at least once from the end of the winding of the electrode foil to form a capacitor element.The capacitor element is impregnated with an electrolytic solution, and then stored in a case and sealed to form an electrolytic capacitor. complete. In addition to the above embodiments, the separator may have three or more layers or any combination of fiber layers may be used. It goes without saying that the above-mentioned adhesive 6 does not insulate and cut off the fiber layers at the upper and lower boundaries, but the upper and lower fiber layers are held at the same potential by impregnating them with an electrolytic solution.

In the electrolytic capacitor constructed as described above, the chemical fibers 4 and natural fibers 5, or either one of the fibers constituting the separator, are not mixed with each other, but are bonded together using an adhesive containing the above-mentioned low-resistance conductive material. As the separator is made up of 100% carbon, the thickness and density are uniform, pinholes caused by gaps and unevenness are eliminated, and the number of short circuits is significantly reduced.The separator can be made thinner, so the electrode spacing can be shortened, resulting in a smaller size. After impregnation, the equivalent series resistance of the separator is reduced, and since the above-mentioned conductive material is difficult to flow out of the separator during use, the tan δ value of the capacitor is extremely small and reliability is significantly improved.

Next, based on the above example, the rating is 25WV,
We manufactured a 1000μF electrolytic capacitor and compared it to the conventional product by 85
The load life characteristics at ℃ were compared.

FIG. 3 is a load life characteristic diagram of the product, which proves that the rate of change in capacitance, tan δ, etc. of the product of the present invention is extremely small.

As mentioned above, the electrolytic capacitor of the present invention significantly improves electrical characteristics such as impedance characteristics and load life characteristics, and also realizes miniaturization, and is of great industrial and practical value.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the main parts of an electrolytic capacitor element, Fig. 2 A, B, C, D, Ho, and F are cross-sectional views of an embodiment of a separator related to the electrolytic capacitor of the present invention, and Fig. 3 is a load life. It is a characteristic diagram. 1: anode foil, 2: cathode foil, 3: separator,
4: Chemical fiber, 5: Natural fiber, 6: Adhesive.

Claims (1)

[Claims] 1. In an electrolytic capacitor formed by winding a separator formed by laminating chemical fibers and natural fibers or one of them between electrode foils and impregnating the separator with an electrolytic solution, the fiber layer of the separator is a liquid, An electrolytic capacitor characterized in that it is laminated together using an adhesive containing a conductive material such as a solid electrolyte.