High-temperature-resistant long-service-life aluminum electrolytic capacitor

Abstract

The invention discloses a high-temperature-resistant long-service-life aluminum electrolytic capacitor, which comprises a core cladding, a shell arranged outside the core cladding, and colloidal particles covering the core cladding and used for sealing the shell, and is characterized in that the core cladding adsorbs electrolyte; the electrolyte is composed of a solvent, a solute and an additive,wherein the solvent of the electrolyte is ethylene glycol; the solute of the electrolyte comprises ammonium hydrogen azelate, ammonium dodecanedioate, diammonium hydrogen citrate and ammonium isosebacate; the additives comprise ammonium p-nitrobenzoate, p-nitrophenol, monobutyl phosphate, ammonium hypophosphite, nano silicon dioxide, polyethylene oxide ether, 8-hydroxyquinoline and polyborate. Through the electrolyte, the temperature resistance of the electrolyte can be improved, volatilization of the electrolyte at a high temperature is reduced, saturated vapor pressure is reduced, the conductivity of the electrolyte is improved, DF and ESR values of the capacitor are reduced, spontaneous heating in the capacitor is reduced, the high-voltage aluminum electrolytic capacitor can resist a high temperature of 115 DEG C or above, and the service life of the high-voltage aluminum electrolytic capacitor is guaranteed.

Description

technical field [0001] The invention relates to the technical field of capacitor manufacturing, in particular to an aluminum electrolytic capacitor with high temperature resistance and long service life. Background technique [0002] Aluminum electrolytic capacitors have a wide range of applications, such as LED general lighting. LED is recognized as the "green lighting" of the 21st century, with the characteristics of "high energy saving", "long life", "variety", "environmental protection" and "high-tech". LED general lighting has become an industry hotspot with the most market potential. With the continuous development of technology and cost optimization, higher requirements are put forward for the high temperature resistance and long life of aluminum electrolytic capacitors. [0003] At present, in the production industry of aluminum electrolytic capacitors for LEDs at home and abroad, the high temperature resistance of aluminum electrolytic capacitors is generally -25 ~...

AI Technical Summary

Problems solved by technology

Because the electrolyte is temperature-resistant at 105°C or 115°C, the capacitor is likely to cause the explosion-proof valve of the capacitor to bulge due to the insufficient temperature resistance of the electrolyte at a high temperature working temperature above 115°C, and the electrolyte leaks, causing the capacitor to overheat. premature failure

Secondly, the applicant found that the conductivity of the electrolyte was not high, and the DF and ESR values ​​of the produced capacitors were relatively high. When subjected to the large ripple current of a small-volume high-power LED industrial and mining lamp, the internal self-heating of the capacitor was serious, and the capacitor was prone to The explosion-proof valve bulges and the electrolyte leaks, causing the capacitor to fail prematurely

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