Preparation method of multi-layer chip polymer solid aluminum electrolytic capacitor

Abstract

The invention provides a preparation method of a multi-layer chip polymer solid aluminum electrolytic capacitor. The method comprises the following steps: cutting a formed aluminum foil into the required size, arranging insulation rubber on the formed aluminum foil, and dividing the formed aluminum foil into a cathode region and an anode region by the insulation rubber; and then sequentially carrying out pretreatment, repairing, preliminary treatment, chemical polymerization, re-repairing, electrochemical polymerization, conductive graphite layer formation, conductive silver layer formation, lamination and packaging, wherein a pretreating solution adopted in the preliminary treatment is prepared from a coupling agent, a surfactant and a solvent. According to the preparation method provided by the invention, the ESR of the polymer solid aluminum electrolytic capacitor can be obviously reduced; and the qualified rate of a leakage current is improved, so that the qualified rate of the produced polymer solid aluminum electrolytic capacitor is obviously improved.

Description

【Technical field】 [0001] The invention relates to a preparation method of an electrolytic capacitor, in particular to a preparation method of a laminated sheet polymer solid aluminum electrolytic capacitor. 【Background technique】 [0002] Aluminum electrolytic capacitor refers to a capacitor formed by anodic oxidation on the surface of valve metal aluminum to form a thin layer of aluminum oxide as the dielectric, and the electrolyte as the cathode. Aluminum electrolytic capacitors are divided into liquid aluminum electrolytic capacitors and solid aluminum electrolytic capacitors according to the electrolyte state. [0003] Liquid aluminum electrolytic capacitors have great advantages in product voltage and product capacity, and can be made into capacitors with very high voltage and large capacity. However, liquid aluminum electrolytic capacitors have a series of disadvantages: for example, the electrolyte of liquid aluminum electrolytic capacitors is liquid, which may cause...

AI Technical Summary

Problems solved by technology

However, liquid aluminum electrolytic capacitors have a series of disadvantages: for example, the electrolyte of liquid aluminum electrolytic capacitors is liquid, which may cause liquid leakage, combustion or explosion during long-term storage or use, and there are certain potential safety hazards; High-frequency characteristics and filtering effects are poor; in addition, as electronic products increasingly pursue miniaturization, the perforated plug-in components used in the past can no longer be reduced, especially large-scale, highly integrated ICs, and surface mount components have to be used to improve yield, increase production efficiency and reduce production costs

[0005] However, the production process of the existing chip-type solid aluminum electrolytic capacitors is not only complicated, but also requires dozens of processes to complete the final product production, and the ESR is high, the leakage current pass rate is low, and the polymer solid aluminum electrolytic capacitors produced The pass rate is not ideal