Low Leakage Electrolytic Capacitors

Abstract

The invention discloses a low-electric leakage electrolytic capacitor. The capacitor comprises a wound type capacitor assembly, a mixed type conductive medium and a packaging body; an anode foil, a cathode foil and an isolating membrane between the anode foil and the cathode foil are wound so as to form the wound type capacitor assembly; the mixed type conductive medium is impregnated in the woundtype capacitor assembly; the mixed conductive medium contains a conductive polymer and an ionic liquid; and the packaging body completely wraps the wound type capacitor assembly and the mixed type conductive medium. The low-electric leakage electrolytic capacitor of the invention has the superior characteristics of a solid-state low-electric leakage electrolytic capacitor and can alleviate an electric leakage condition.

Description

technical field [0001] The invention relates to an electrolytic capacitor, in particular to a low-leakage electrolytic capacitor which combines the excellent characteristics of a solid electrolytic capacitor and a liquid electrolytic capacitor. Background technique [0002] As we all know, the basic function of a capacitor is to charge and discharge, and the electrical functions derived from it, such as bypass, coupling, filtering, oscillation, phase shift, etc., make capacitors become consumer appliances, computer motherboards and peripherals, and power supplies. One of the indispensable components in the electronic circuits of communication products and automotive electronic products. [0003] According to different electrolytes, capacitors are divided into liquid electrolytic capacitors using fluid electrolytes (such as electrolyte) and solid electrolytic capacitors using solid electrolytes (such as conductive polymers). Compared with liquid capacitors, solid electrolytic...

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Problems solved by technology

[0003] According to different electrolytes, capacitors are divided into liquid electrolytic capacitors using fluid electrolytes (such as electrolyte) and solid electrolytic capacitors using solid electrolytes (such as conductive polymers). Compared with liquid capacitors, solid electrolytic capacitors have a lower Effective Series Resistance (Equivalent Series Resistance; ESR), however, the conductive solid layer included in the solid electrolytic capacitor cannot be uniformly and tightly covered on the surface of the sponge-like anode foil, and it is prone to peeling off; in addition, in order to reduce ESR, the conductive solid layer is usually Therefore, repeated oxidative polymerization is required in actual manufacturing, so as to cause damage to the dielectric film. Since the solid electrolytic capacitor lacks a repair mechanism for the damage, the leakage current may increase. In the worst case There is a possibility of a short circuit in the case of

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