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Method for improving qualified rate of service life of high-voltage high-capacity electrolytic capacitor

An electrolytic capacitor and large-capacity technology, which is applied in the direction of solid electrolytic capacitors, capacitor electrodes, capacitor parts, etc., can solve the problems of low life pass rate, difficult control of water content in electrolyte components, poor consistency of gel electrolyte content, etc., to achieve Effect of increasing technology, improving pass rate and reliability, and prolonging service life

Active Publication Date: 2022-04-05
GUIZHOU EDUCATION UNIV
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the water content in the electrolyte composition and the content of the gel electrolyte are not easy to control, and the consistency is poor, which leads to the problem of low service life pass rate

Method used

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  • Method for improving qualified rate of service life of high-voltage high-capacity electrolytic capacitor

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specific Embodiment approach

[0033] The specific implementation of the technical solution of the present invention is as follows:

[0034] Taking the CAX1 type capacitor 125V350 μ F, the CAX2 type capacitor 100V750 μ F, and the CAX3 type capacitor 75V1000 μ F as examples, the specific implementation of the technical solution of the present invention is as follows:

[0035] 1. CAX1 type capacitor 125V350μF

[0036] Add 1.6g of citric acid per 50ml of 38% sulfuric acid solution in the original gel working electrolyte, adopt the isostatic pressing molding method, place the anode block to be impregnated in the isostatic pressing molding equipment, heat it to 65°C, and place the original The immersion time is shortened from 20h to 1h, which greatly improves the work efficiency, and the electrical performance of the product is almost unaffected.

[0037] 2. CAX2 type capacitor 100V750μF

[0038] Add 1.6g of maleic acid per 50ml of 38% sulfuric acid solution in the original gel working electrolyte, adopt the i...

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Abstract

The invention discloses a method for improving the life qualification rate of a high-voltage high-capacity electrolytic capacitor, and belongs to the field of electronic components. The method comprises the following three aspects: (1) improving the sparking voltage of the gel working electrolyte: adding organic acid, and forming an adsorption layer for shielding an electric field on the surface of a dielectric film, so as to improve the sparking voltage of the electrolyte; (2) improving the infiltration effect of the working electrolyte by adopting an isostatic pressing method, namely applying isostatic pressure in a segmented manner by adopting a segmented pressure applying isostatic pressing method, putting the anode block to be impregnated into isostatic pressing forming equipment, and heating until the viscosity of the electrolyte is reduced, the flowability is enhanced, and the electrolyte uniformly permeates into each three-dimensional net-shaped micropore channel; (3) pre-aging: adding a room-temperature pre-aging technology before aging; the problems that in the prior art, the water content in electrolyte components and the content of gel electrolyte are not easy to control, and the consistency is poor, so that the life percent of pass is low are solved. The electrolytic capacitor is widely applied to the technical field of long-life high-voltage large-capacity electrolytic capacitors.

Description

technical field [0001] The invention belongs to the field of electronic components, and further relates to the field of large-capacity electrolytic capacitors, in particular to a method for improving the service life pass rate of high-voltage large-capacity electrolytic capacitors. Background technique [0002] The working electrolyte used in electrolytic capacitors has a great relationship with the electrical performance and life of the components. Currently the most used is still the aqueous gel-like working electrolyte. Water is the only source of oxygen needed to repair the dielectric oxide film. Electrolytes without added water will also generate water during the preparation process. Therefore, it cannot be regarded as an anhydrous electrolyte without adding water during the preparation process; at the same time, water is also an excellent solvent. [0003] Due to the high aging voltage of high-voltage and large-capacity electrolytic capacitors, gas is generated when...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/15H01G9/04
CPCY02E60/13
Inventor 鄢波邓明森沈虎峻潘其凤邹雪锋杨恒修
Owner GUIZHOU EDUCATION UNIV
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