Method for preparing solid electrolytic capacitor

Abstract

The invention discloses a method for preparing a solid electrolytic capacitor, which comprises the following steps of: forming an oxide film medium and solid electrolytic layers on the anode surface in turn, wherein the first cathode layer is a carbon layer and a second cathode layer is a silver layer, and preparing each single capacitor element; welding the anodes of single capacitor elements together to prepare an anode electrode part and welding the anode electrode part on an anode lead frame; adhering the cathodes of the single capacitor elements together to prepare a cathode electrode part and adhering the cathode electrode part on a cathode lead frame; and finally encapsulating to prepare the solid electrolytic capacitor through encapsulation materials, wherein an adhesive adopted for the adhesion between cathodes of single capacitor element and the adhesion between the cathode electrode part and the cathode lead frame is silver-coated copper conductive paste. By adopting the silver-coated copper conductive paste as the adhesive, the method for preparing the solid electrolytic capacitor overcomes the defect that the copper powder is easily oxidized, solves the problem that the price of the silver powder is high, and effectively reduces the cost.

Description

【Technical field】 [0001] The invention relates to a preparation method of a solid electrolytic capacitor. 【Background technique】 [0002] Solid electrolytic capacitors are installed in the power supply circuit and peripheral circuit of the CPU in various portable information terminals such as notebook personal computers, desktop personal computers, and mobile phones, and various image information devices such as digital cameras. Its miniaturization, low profile, and large capacitance have been widely used in many electronic information devices in recent years. [0003] The preparation method of the solid electrolytic capacitor in the prior art generally forms a single capacitor element by sequentially forming an oxide film medium, a solid electrolyte layer, a carbon layer for the first cathode layer, and a silver layer for the second cathode layer on the surface of the anode body. The anodes of a single capacitor element are welded together to make the anode electrode part,...

AI Technical Summary

Problems solved by technology

The anodes of a single capacitor element are welded together to make the anode electrode part, and the anode electrode part is then welded on the anode lead frame, and the cathodes of the single capacitor element are bonded together to make the cathode electrode part, and the cathode electrode part is then bonded On the cathode lead frame, a solid electrolytic capacitor is finally made into a solid electrolytic capacitor by encapsulating with a plastic compound; the bonding agent between the cathodes of the single capacitor element and the bonding between the cathode electrode part and the cathode lead frame is silver conductive glue , silver conductive adhesive has good conductivity, but the price is very expensive, accounting for a large part of the cost of capacitors

If copper powder is used directly, it is easy to be oxidized

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