A high-voltage aluminum electrolytic capacitor resistant to low temperature of -40°C and its manufacturing method

Abstract

A minus 40 DEG C low temperature resistant high-voltage aluminum electrolytic capacitor disclosed by the present invention comprises a shell and a cover body, a core package is arranged in the shell and is immersed in an electrolyte, and the conductivity of the electrolyte at a minus 40 DEG C temperature is more than 1.4 ms / cm. The core package is formed by overlapping and winding an anode foil, acathode foil and the electrolytic papers, wherein the electrolytic papers used as the substrates are respectively arranged at the same sides of the cathode foil and the anode foil and comprise an inner-layer electrolytic paper and the outer-layer electrolytic paper, the materials of the inner-layer electrolytic paper are Manila hemp and kraft paper, and the material of the outer-layer electrolytic paper is the plant fiber on which the coating processing and the bleaching processing are not carried out. According to the present invention, by improving the technology steps and the conditions and cooperating overall, the electrostatic capacity of the high-voltage aluminum electrolytic capacitor on the minus 40 DEG C low temperature condition is improved to the 65% to 80% on a 20 DEG C temperature condition, thereby effectively improving the low temperature resistance of the high-voltage aluminum electrolytic capacitor, being able to reduce the cost, shrinking the size of the capacitor, and better satisfying the current stricter electronic design technical requirements.

Description

technical field [0001] The invention relates to the technical field of electrolytic capacitors, in particular to a high-voltage aluminum electrolytic capacitor with low temperature resistance of -40°C and a manufacturing method thereof. Background technique [0002] At present, electronic products have become an indispensable part of modern life. Various types of electronic products and electronic equipment are widely used in all aspects of people's production and life, and a large number of various types of electronic products and electronic equipment are exported to the world. , in order for electronic products and electronic equipment to work normally under different temperature and environmental conditions around the world, the designed electronic products and electronic equipment must be designed for wide temperature. However, it is often the low-temperature characteristics of the aluminum electrolytic capacitors used that determine its wide-temperature stability. The ...

AI Technical Summary

Problems solved by technology

However, the high-voltage aluminum electrolytic capacitor with the above design has a qualified impedance ratio at a low temperature of -40°C, but the electrostatic capacity of the high-voltage aluminum electrolytic capacitor at a low temperature of -40°C is only 30% to 50% of that at 20°C. , is unable to meet the current stringent electronic design technical requirements (cost, volume, etc.)

The high-voltage electrolytic paper, due to the high-density material, has insufficient adsorption capacity for the electrolyte, which is likely to cause a decrease in the electrostatic capacity of the capacitor due to insufficient electrolyte content at low temperature and premature failure of the capacitor life.