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, electrolyte leakage, and premature failure of the capacitor life; (2) Aluminum electrolytic capacitors are used for automotive electronics, especially for car DVD equipment, Capacitors used in car DVDs have strict requirements on high temperature resistance. When the vehicle is running, it is affected by the radiant heat of the engine and needs to work in a high temperature environment. When it is parked, it is affected by the low external temperature and requires low temperature resistance.

Specifically, it is required to have thermal stability in a wide temperature range from a low temperature range of about -40°C to a high temperature range of about +125°C, but the existing aluminum electrolytic capacitors operate at a temperature range of -40°C to +125°C Can't work stably for a long time