JPH039319Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a wound element type solid electrolytic capacitor using an organic semiconductor.

(b) Prior Art The wound element of the capacitor described above is made of separator paper such as manila hemp or kraft pulp, and aluminum foil.

In order to facilitate the impregnation of the molten and liquefied organic semiconductor into this wound element, and to improve the electrical characteristics of the finished capacitor, the above-mentioned wound element is heat-treated when impregnated with the organic semiconductor. carbonized separator paper is used (JP-A-Sho
58-123715).

However, carbonization causes a disadvantage in that the fiber diameter of the separator paper decreases.

(c) Problems to be solved by the invention As mentioned above, a decrease in the fiber diameter of the separator paper is the same as a change in the thickness of the separator paper of the element, so the winding strength becomes looser and the aluminum Since the foil is in a floating state in the middle, when impregnated with an organic semiconductor, it tends to become a bamboo-shaped element that is noticeably rolled up and cannot be impregnated. Furthermore, since the aluminum foil is twisted due to misalignment, damage to the chemical conversion coating of the foil also occurs. This tendency is more likely to occur with larger diameter elements (approximately 6.3 mm or more in diameter), and is unavoidable with diameters of 10 mm and 13 mm. The present invention attempts to prevent such misalignment of winding.

(d) Means for solving the problems The feature of the solid electrolytic capacitor of the present invention is that the solid electrolytic capacitor is made by impregnating a winding element made of a separator, electrode foil, etc. with an organic semiconductor. The reason is that synthetic paper mixed with glass fiber was used.

(E) Effect According to the present invention, when a separator is carbonized, the vegetable fibers become thinner due to carbonization, but glass fibers do not become thinner, so the thickness of the separator does not become thinner.

Furthermore, the presence of vegetable fibers allows the paper to be made thinner than when only glass fiber is used, and the tensile strength required during winding is also improved. In other words, separator paper for electrolytic capacitors usually has a thickness of 40 to 60μ.
m is used, but since glass fiber is a semi-rigid material, it is impossible to make it to this thickness with only glass fiber, and if you try to use it, you will have to increase the thickness of the separator and there are various problems. , resulting in disadvantage.

(F) Example A synthetic paper made by mixing glass fiber with plant fibers such as manila hemp or kraft pulp is used as a separator, and this is wound together with a cathode foil and an anode foil made of aluminum to prepare a wound element. The element is then carbonized. Incidentally, the mixing ratio of the vegetable fibers and the glass fibers, and the diameter and length of the glass fibers are determined depending on the thickness of the separator and the required tensile strength.

1 and 2 show the wound element before and after the carbonization process in this example, respectively, and as an idea, FIGS. 3 and 4 show the wound element before and after the carbonization process in the conventional example, respectively. The wound elements after treatment are shown respectively. In these figures, 1 is an anode foil, 2 is a cathode foil, 3 is a vegetable fiber, 4 is a glass fiber, and 3' is a carbonized vegetable fiber.

(g) Effects of the invention According to the invention, even if the separator of the wound element is carbonized, its thickness does not become thinner, and therefore, the winding element does not become misaligned.

[Brief explanation of the drawing]

FIGS. 1 and 2 are microscopic diagrams showing an embodiment of the present invention, and FIGS. 3 and 4 are microscopic diagrams showing a conventional example. 1... Anode foil, 2... Cathode foil, 3... Vegetable fiber, 4... Glass fiber.

Claims (1)

[Scope of utility model registration request] In a solid electrolytic capacitor formed by impregnating an organic semiconductor into a winding element formed by winding electrode foils with a separator in between, the separator is carbonized synthetic paper made of vegetable fiber mixed with glass fiber. A solid electrolytic capacitor characterized in that it is used.