Electrolytic capacitor

Abstract

The invention relates to the field of capacitors, and provides an electrolytic capacitor for prolonging service life of capacitors. The electrolytic capacitor comprises an aluminum foil anode, an aluminum foil cathode, a partition and electrolyte; surfaces of the aluminum foil anode and the aluminum foil cathode are covered with alumina membrane; the partition is arranged in the electrolyte between the anode and the cathode; the electrolyte comprises, by mass, 65-70 parts of ethanediol, 1-6 parts of modifiers, 8-10 parts of ammonium sebacate, 1-2 parts of ammonium dodecanedioate, 5-8 parts ofpolyethylene glycol, and 2-4 parts of additives. The anode or cathode made of the aluminum foil can suppress dissolving of aluminium effectively, reduce impedance of the capacitor, and prolong servicelife of the capacitor; combination of the aluminum anode and aluminium cathode and the electrolyte can prolong the service life of the capacitor further.

Description

technical field [0001] The invention relates to the field of capacitors, in particular to an electrolytic capacitor. Background technique [0002] Electrolytic capacitor is a kind of capacitor, the metal foil is the positive electrode (aluminum or tantalum), the oxide film (aluminum oxide or tantalum pentoxide) close to the metal is the dielectric, the cathode is made of conductive material, electrolyte (the electrolyte can be liquid or Solid) and other materials, because the electrolyte is the main part of the cathode, so the name of the electrolytic capacitor. [0003] At present, due to the relatively single working electrolyte system used in the existing aluminum electrolytic capacitors for inverters, the high-temperature physical and chemical properties of the working electrolyte are unstable, the flashover voltage is low, and reactions such as thermal decomposition, amidation, and esterification are prone to occur. It adopts a conventional design, the stability of the...

AI Technical Summary

Problems solved by technology

[0003] At present, due to the relatively single working electrolyte system used in the existing aluminum electrolytic capacitors for inverters, the high-temperature physical and chemical properties of the working electrolyte are unstable, the flashover voltage is low, and reactions such as thermal decomposition, amidation, and esterification are prone to occur. It adopts a conventional design, the stability of the capacitor is not high, the ability to withstand ripple current is poor, and it is easy to decompose under high temperature reaction, etc., resulting in high internal heat generation and large temperature rise changes in the product during the production, charging and aging process.

In addition, the miniaturization of the product, the reduction of the internal space, and the phenomenon of large temperature rise directly lead to repeated fires, burns, and micro-explosions inside the product. The appearance of this defective product has no obvious failure characteristics. It cannot be completely eliminated in the process of sorting. This bad phenomenon will lead to short circuit and open circuit during use, and there are serious quality risks.

Images