Special aluminum electrolytic capacitor for vehicle-mounted electronics

Abstract

The invention discloses a special aluminum electrolytic capacitor for vehicle-mounted electronics. An electrolyte comprises the following components in percentage by weight: 20%-35% of solute, 15%-20%of additive and the balance of solvent, wherein the solute is ammonium azelate, ammonium adipate, ammonium suberate and carboxylate containing a cyclobutane group, the additive is a waterproof mixture, and the solvent is ethylene glycol, ammonium sebacate and branched carboxylate. A core package is soaked with electrolyte with specific composition and proportion; the anode foil is a formed voltage-withstanding aluminum foil adopting 1.6 times of capacitor rated voltage, and the anode foil adopts a corrosion energizing aluminum foil with energizing voltage of 530V; the contact resistance between the positive electrode guide pin and the anode foil is 0.8 momega or less; and the contact resistance between the negative electrode guide pin and electrode cathode foil is 1 momega or less. Through improvement of process materials and conditions and overall cooperation, the aluminum electrolytic capacitor has thermal stability within the temperature range of -40 DEG C to 125 DEG C and is longin service life at 105 DEG C.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolytic capacitors, in particular to an aluminum electrolytic capacitor dedicated to vehicle-mounted electronics. Background technique [0002] At present, the market of my country's aluminum electrolytic capacitor manufacturing enterprises is dominated by consumer products such as flat-panel TVs, monitors, DVDs, electronic ballasts, computers, audio and other general industrial products. As the world's aluminum electrolytic capacitor industry is increasingly concentrated in China, Aihua Group and a few domestic aluminum electrolytic capacitor manufacturers have also mastered high-end technology and mass-produced high-end electronic ballasts, solar energy, wind power, communications and switching power supplies , inverters, automotive electronics and other special aluminum electrolytic capacitors. [0003] With the development of the automotive electronics industry, the service life of capa...

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Problems solved by technology

[0004] However, in the process of implementing the embodiment of the present application, the inventors of the present application found that there are certain disadvantages in the use of aluminum electrolytic capacitors: (1) the current aluminum electrolytic capacitors for vehicle electronics have a short service life at 105°C, In the process of use, the capacitor is easy to inhibit the evaporation of the electrolyte, so that the stability at high temperature cannot be achieved; the ability of the electrolyte to inhibit esterification at high temperature is not strong, and the DF and ESR values ​​of the produced capacitors are relatively high. For a long time and high temperature, the inside of the capacitor will generate heat, and the capacitor will easily generate gas to cause bulging,