Long-life aluminum electrolytic capacitor and manufacturing method thereof

Abstract

The invention belongs to the technical field of electrolytic capacitors, and in particular discloses a long-life aluminum electrolytic capacitor and a manufacturing method thereof. The aluminum electrolytic capacitor comprises an aluminum shell, a positive guide pin, an anode foil, a negative guide pin, a cathode foil and an electrolytic paper, wherein the electrolytic paper is arranged between the anode foil and the cathode foil, and with the electrolytic paper, the anode foil and the cathode foil are wound together to form a core bag; a cover body is sleeved on the core bag and the core bagis arranged in an aluminum shell; the nail connecting part of the negative guide pin and the cathode foil is provided with a foliation; the foliation covers a nail connecting hole of the cathode foiland the negative guide pin; the anode foil has high withstand voltage and low specific volume; the cathode foil is a formation cathode foil; and the electrolytic paper has low tightness and high thickness. The aluminum electrolytic capacitor has high temperature resistances and high-ripple current impact resistance, the high-temperature load service life reaches 20000 hours or longer at 105 DEG Cfor, and problems of short service life, low stability and poor capability of stable ripple current resistance of the aluminum electrolytic capacitor in the prior art are solved effectively.

Description

technical field [0001] The invention belongs to the technical field of electrolytic capacitors, and particularly relates to a long-life aluminum electrolytic capacitor and a manufacturing method thereof. Background technique [0002] At present, the life of aluminum electrolytic capacitors in the industry is generally short. Generally, most of the medium and high voltage products have a life of 8,000 hours at 105°C. The service life cannot meet the end customer's life expectancy for electronic products. [0003] The failure mode of aluminum electrolytic capacitors in terms of life is mainly that the capacity of the product decreases during the high temperature load life, and the decline rate exceeds the standard range; or the tangent value of the product loss angle increases, exceeding the standard range. Cause Analysis: [0004] (1) The cathode foil is prone to hydration with the electrolyte under high temperature or electrical stress, and the oxide film thickens, resulti...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a long-life aluminum electrolytic capacitor, which has strong high temperature resistance, a high temperature load life of 105°C, 20,000 hours or more, high ripple current impact resistance, and effective Solve the problems of short service life, low stability and poor ability to withstand stable wave current in existing aluminum electrolytic capacitors

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