Manufacture method of solid electrolytic capacitor

Abstract

A manufacture method of a solid electrolytic capacitor comprises the following steps: inserting an isolation layer between an anode foil which is made of valve metal and provided with an oxidation film on the surface and a cathode foil, and winding into a core packet, winding and fixing the core packet by an adhesive tape; immersing the core packet into chemical fluid, applying voltage to chemically repair, and carrying out carbonizing, cleaning and drying; steeping the formed core packet in oxidant and monomer solution for 1-10 minutes; putting the core packet steeped with the oxidant and the monomer solution into a temperature control device to carry out heating treatment for a certain period of time, and initiating polymerization, wherein the heating treatment is multi-segment polymerization at different temperature ranges, the temperature ranges ascend in a ladder form, and the polymerization temperature range is 20-200 DEG C; packaging the core packet into an aluminum shell, sealing by a rubber stopper, and carrying out segmental aging treatment on the sealed product at 80-180 DEG C. By the adoption of the manufacture method, a generated conductive polymeric material is high in molecular weight, good in structural regularity, and high in conductivity, so that the capacitor has the advantages of low equivalent serial resistance and high capacity.

Description

technical field [0001] The invention relates to a manufacturing method of a coiled solid electrolytic capacitor, in particular to a manufacturing method of a solid electrolytic capacitor using a conductive high molecular polymer generated by multi-stage in-situ polymerization as electrolyte during the production process. Background technique [0002] Capacitors are one of the most common electronic components and are widely used in various electronic products. As traditional mainstream capacitors, electrolytic capacitors use aluminum and other anode and cathode foils with valve metal functions, and insert an isolation layer in the middle. The electrolyte is used as a conductive cathode, wound and packaged in an aluminum shell. Compared with other types of capacitors, the cost is low, the production process is simple, and it is suitable for mass production, so it occupies a considerable market share. [0003] Solid electrolytic capacitor is a new type of capacitor developed ...

AI Technical Summary

Problems solved by technology

However, the low-temperature polymerization reaction takes a long time to complete the reaction, and under in-situ polymerization conditions, it is easy to leave unreacted monomers, oxidants and solvents in the core pack during low-temperature polymerization.

Lu Xiliang et al. (Patent Publication No. CN 101004974A) proposed the method of first low-temperature polymerization and then high-temperature heat treatment. Although the problem of volatilization of residual solvents was solved, the time required for the polymerization reaction was very long, and the post-treatment increased the production process, which was beneficial to the improvement of Production efficiency is bad

Moreover, the process of high-temperature heat treatment will damage the oxide film of the anode foil and the conductive polymer cathode layer, which will adversely affect the electrical properties of the capacitor, such as increased leakage current, decreased electrostatic capacity, and increased ESR.

Images