Method for impregnating low-viscosity electrolyte used for electrolytic capacitor

Abstract

The invention relates to a method for impregnating low-viscosity electrolyte used for an electrolytic capacitor. The method comprises the following steps of: (1) discharging a cartridge to obtain a cartridge sieve; (2) then superposing the cartridge sieve in an impregnation container and sealing and vacuumizing the impregnation container; (3) sucking the low-viscosity electrolyte from a liquid storage barrel, keeping the impregnation container in a vacuum state and then restoring the impregnation container back to a normal-pressure state; (4) applying positive pressure to the impregnation container and vacuumizing the impregnation container again after the electrolyte is completely discharged; and (5) taking the cartridge sieve out. The method of the invention has the advantages of simplicity, low cost, suitability for industrial use and capability of effectively controlling the impregnation time, impregnation rate and impregnation effect of the capacitor cartridge during and after impregnation by rationally utilizing equipment, so that the low-temperature performance of the manufactured capacitor is met; and damage to the capacitor cartridge is avoided without performing a centrifugal fluid exhaustion process, so that the stability of the capacitor is improved and the service life is prolonged.

Description

technical field [0001] The invention belongs to the field of electrolytic solution impregnation, in particular to a low-viscosity electrolytic solution impregnation method for electrolytic capacitors. Background technique [0002] With the continuous expansion of the application temperature range of complete equipment, especially military equipment, the requirement for capacitors is to be able to work stably at -55 degrees to -60 degrees, and to have a small impedance change rate at low temperature and normal temperature, and a low-temperature capacitance. Special properties such as low attenuation. In this situation, the electrolyte of electrolytic capacitors must meet the characteristics of low viscosity, low freezing point, and good low-temperature solubility. However, due to the low viscosity of the electrolyte, it will bring difficulty in controlling the impregnation rate. If the impregnation rate is too high, the vapor pressure will increase after high temperature, an...

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Problems solved by technology

In this situation, the electrolyte of electrolytic capacitors must meet the characteristics of low viscosity, low freezing point, and good low-temperature solubility. However, due to the low viscosity of the electrolyte, it will bring difficulty in controlling the impregnation rate. If the impregnation rate is too high, the vapor pressure after high temperature will increase, and the capacitor will easily bulge; if the impregnation rate is too small, the capacitor impedance will be too large, and the life will be shortened.

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