Capacitor and preparation method thereof

Abstract

The invention discloses a capacitor and a preparation method thereof. The capacitor comprises a core, a conductor and a shell; the core comprises cathode foil, anode foil and electrolytic paper, and is internally impregnated with an electrolyte and provided with a conductive film; one end of the conductor is connected with the core, and the other end of the conductor is suspended; and the core isarranged in the shell. According to the capacitor and the preparation method thereof, the wound core of the capacitor is impregnated with macromolecular suspension liquid, and thus after the core is dried, a macromolecular film with high conductivity can be formed in the core to achieve low impedance of the capacitor; meanwhile, the capacitor after the macromolecular film is formed is impregnatedwith the electrolyte to repair an oxidation film of the anode aluminum foil, and thus the capacitor can have the very low leakage current value; and therefore, the capacitor has the lower ESR value, can withstand a larger ripple current, has the capacity for repairing the anode oxidation film, and is superior to a solid capacitor in withstand voltage storing capacity.

Description

technical field [0001] The invention relates to the technical field of electronic devices, in particular to a capacitor and a preparation method thereof. Background technique [0002] As a commonly used device on electronic circuits, capacitors play the electrical roles of filtering, bypassing, coupling, decoupling, and switching, and filtering is the most commonly used one. When the AC ripple current flows through the capacitor, since the capacitor has ESR (Equivalent Series Resistance, equivalent series resistance), it will inevitably heat the capacitor, and the heat generated by the capacitor depends on the value of the ESR value of the capacitor, and the ESR value is small, resulting in Less heat means it can withstand larger ripple currents. In the prior art, there are two structures of solid capacitor and liquid capacitor. Among them, the ESR value of the solid capacitor is small, but the oxide film of the anode foil cannot be repaired, resulting in a large leakage cu...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a capacitor and its preparation method to solve or at least partly solve at least one of the above problems

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