Aluminum electrolytic capacitor

Abstract

The present invention aims to provide a highly reliable aluminum electrolytic capacitor which has no flash points and shows little change or degradation in external appearance and properties. The electrolytic capacitor of the invention comprises a capacitor as an electrode using an aluminum foil, a driving electrolyte having a water content of 20-90wt%, a bottom barrel type house of the capacitor receiving the driving electrolyte, and a sealing material which seals an opening part of the house. The driving electrolyte contains one or more nitro compound of 0.01% by weight selected from p-nitrophenol, m-nitrophenol, o-nitrophenol, p-nitrobenzoic acid, m-nitrobenzoic acid, o-nitrobenzoic acid, p-nitroanisole, m-dinitroanisole, p-dinitroanisole. The freezing point of the electrolytic solution is under -10 DEG C, the chlorine content of the sealing material is less than 300ppm to the weight of the sealing material.

Description

[0001] This case is a divisional application with the application number 99121506.0, the application date of October 13, 1999, and the invention name "aluminum electrolytic capacitor". technical field [0002] The present invention relates to a highly reliable aluminum electrolytic capacitor (hereinafter referred to as an electrolytic capacitor) which uses a non-flash point electrolytic solution, has excellent low-temperature characteristics, and exhibits little change in appearance and deterioration in characteristics even when used at high temperatures for a long period of time. Background technique [0003] The structure of the conventional capacitor is as shown in Figure 1. A separator 4 made of Manila hemp, kraft paper, etc. is inserted between the anode foil 2 and the cathode foil 3, and it is wrapped in this state. Liquid (hereinafter referred to as electrolyte solution) impregnation, then insert it into the aluminum case 5, and finally seal the opening of the aluminum...

AI Technical Summary

Problems solved by technology

Even with these methods, for capacitors with a rated voltage below 100V, it is difficult to maintain the chemical properties of the capacitor for a long time at a temperature of 9 above 100°C when using electrolytes with high moisture content exceeding 20%.

[0011] In addition, when the high conductivity electrolyte with a moisture content of more than 20% is used for a long time at a temperature above 100°C, it is often encountered when using a low moisture content electrolyte with a moisture content of less than 20%. Problems Caused by Chlorine in Sealing Rubber

In other words, corrosion of the anode aluminum wire will occur during a long-term load test at high temperature, resulting in an increase in leakage current, or corrosion and disconnection of the anode aluminum wire

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