Shenmao Capacitors specialized in aluminum electrolytic capacitors from 1970

Aluminum electrolytic capacitor production process

by:Shenmao     2021-03-19
The main raw materials of aluminum electrolytic capacitors: anode foil, cathode foil, electrolytic paper, electrolyte, guide foil, tape, cover plate, aluminum shell, washer, sleeve, gasket, etc. Production process: cutting, winding, impregnation, assembly, aging, sealing, printing, casing, measurement, packaging, inspection, etc. Aluminum electrolytic capacitor manufacturing process: Step 1: Corrosion of aluminum foil. If you disassemble the shell of an aluminum electrolyte capacitor, you will see that there are several layers of aluminum foil and several layers of electrolytic paper inside, and the aluminum foil and electrolytic paper are attached together. The mechanism is wound into a cylindrical shape, so that between every two layers of aluminum foil is a layer of electrolytic paper that has absorbed the electrolyte. The manufacturing essentials of aluminum foil. In order to increase the area of u200bu200bwar between the aluminum foil and the electrolyte, the appearance of the aluminum foil in the capacitor is not smooth. Instead, the appearance of the aluminum foil is formed into a rugged and unyielding shape through the electrochemical corrosion method, which may increase the appearance product by 7 to 8 times. The electrochemical corrosion process is quite complicated, which involves the type and concentration of the corrosion liquid, the appearance of the aluminum foil, the rate of corrosion, the dynamic balance of voltage, and so on. Step 2: Oxide film formation process After the aluminum foil is electrochemically corroded, it is necessary to use chemical methods to oxidize its appearance to aluminum oxide, which is also the medium of aluminum electrolytic capacitors. After oxidation, carefully review the appearance of aluminum oxide to see if there are freckles or cracks, which will be insufficiently removed. The third step: cutting aluminum foil This measure is very simple and understandable. It is to cut a whole piece of aluminum foil into several small pieces to make it necessary for proper capacitor manufacturing. Step 4: The riveting of the lead The external pin of the capacitor is not directly connected to the inside of the capacitor, but is connected to the inside of the capacitor through the inner lead. Therefore, in this step, we need to properly connect the inner leads of the anode and cathode to the outer leads of the capacitor through ultrasonic bonding. The outer lead usually adopts copper-plated iron wire or oxidized copper wire to reduce resistance, while the inner lead adopts aluminum wire and is directly connected with aluminum foil. The public pays attention to these small measures without any fault. Step 5: The electrolyte in the winding capacitor of electrolytic paper is not directly poured into the capacitor and soaks the aluminum foil in a liquid state, but is laminated with the aluminum foil through the electrolytic paper that has absorbed the electrolyte. Among them, the selection of electrolytic paper and ordinary paper are somewhat different in formula. They are microporous, and the appearance of the paper is not as good as impurities, otherwise it will affect the identity and performance of the electrolyte. In this step, the electrolytic paper that does not absorb the electrolyte is pasted with the aluminum foil, and then rolled into the capacitor casing, so that the aluminum foil and the electrolytic paper form a '101010' isolation state. Step 6: Impregnation of the electrolyte After the winding of the electrolyte paper is completed, the electrolyte is poured in, so that the electrolyte is impregnated on the electrolyte paper. With the innovation of electrolyte formula and the improvement of electrolytic paper manufacturing skills, the current ESR value of aluminum electrolyte capacitors has also been gradually improved, resulting in more than one-tenth of the previous. Step 7: Assembly This step is to assemble the aluminum shell on the surface of the capacitor and connect the outer leads at the same time. The capacitor has been fundamentally formed by this time. The eighth step: crimping. If it is a kind of 'wrapped' capacitor, it is necessary to pass this step to cover the surface of the capacitor with the PVC film covering the surface of the capacitor. However, the current use of PVC film capacitors has become less and less, mainly because this raw material is not suitable for environmental protection, and has not much to do with performance. Step 9: Assembly and assembly Step 10: Charging, aging test Step 11: Parameter review Leakagt Current up (Leakagt Current up) Leakage current abbreviation (LC), Leakagt Current up The magnitude of the passing DC current value, the smaller the current value, the better. Capacity review: Capacity (capacitors referred to as CAP). The goal of the review is to test whether its value is within the allowable deviation range. Over and under are both unqualified. 3DF review: temperature 25℃, frequency 120HZ, non-polarity usually 1KHZ (test condition), a brief note: a kind of dissipation factor will naturally occur in the electronic circuit of the capacitor. Dissipation and loss are both unsatisfactory in Chinese meaning. It uses the opposite side of the trigonometric function to find the value. DF is the customary term in the western region of Taixi. The edge angle is expressed as a percentage '%The smaller the value, the better. The capacitor should be discharged before testing the capacity DF, so that the voltage of the capacitor itself flows into (into) the instrument and destroys the instrument. External review: That is, the appearance of the capacitor (beauty pageant). It must rely on our vision to judge whether it is good or not. It turns out that in each of our manufacturing processes, we all know what is good or bad, and when we should pay In addition, in order to guard against 'lost dogs' (some defective products have not been detected), some still need to review the outside, just in case.
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