Main raw materials for aluminum electrolytic capacitors: anode foil, cathode foil, electrolytic paper, electrolyte, conductive foil, tape, cover plate, aluminum shell, Huasi, sleeve, gasket, etc

Production processes: cutting, winding, immersion, assembly, aging, sealing, printing, casing, measurement, packaging, inspection, etc

Manufacturing process of aluminum electrolytic capacitors:

Step 1: Corrosion of aluminum foil.

If you open the casing of an aluminum electrolyte capacitor, you will see how many layers of aluminum foil and electrolytic paper are inside. The aluminum foil and electrolytic paper are attached together and wound into a cylindrical mechanism, so that there is a layer of electrolytic paper that absorbs the electrolyte between every two layers of aluminum foil.

The manufacturing essentials of aluminum foil. In order to increase the battle area between aluminum foil and electrolyte, the appearance of aluminum foil in capacitors is not smooth, but is formed into a rugged and unyielding shape through electrochemical corrosion, which can increase the appearance area by 7-8 times. The process of electrochemical corrosion is a complex competition, involving the type and concentration of the corrosion solution, the appearance of the aluminum foil, the rate of corrosion, the dynamic balance of voltage, and so on.

Step 2: Formation process of oxide film.

After electrochemical corrosion, aluminum foil needs to be chemically oxidized to form aluminum trioxide, which is the dielectric of aluminum electrolytic capacitors. After oxidation, carefully review the appearance of aluminum oxide to see if there are freckles or cracks, and remove any that are not qualified.

Step 3: Cutting of aluminum foil.

This measure is simple and clear. It is necessary to cut a whole piece of aluminum foil into several small pieces to make it suitable for capacitor manufacturing.

Step 4: Riveting of leads.

The pins outside the capacitor are not directly connected to the inside of the capacitor, but are connected to the inside of the capacitor through internal leads. Therefore, in this step, it is necessary to connect the inner leads of the anode and cathode with the outer leads of the capacitor through ultrasonic bonding. The outer lead is usually made of copper plated iron wire or oxidized copper wire to reduce resistance, while the inner lead is directly connected to aluminum foil using aluminum wire. The public pays attention to these small measures, which require high precision processing.

Step 5: Winding of electrolytic paper.

The electrolyte in the capacitor is not directly poured into the capacitor, soaking the aluminum foil in a liquid state, but is adhered layer by layer to the electrolytic paper that has adsorbed the electrolyte. Among them, there is a slight difference in the formula between the electrolytic paper used and the ordinary paper, which has a microporous shape. The appearance of the paper is not as good as impurities, otherwise it will affect the identity and performance of the electrolyte. And this step is to stick the electrolytic paper without adsorbed electrolyte with aluminum foil, and then roll it into the capacitor shell, so that the aluminum foil and electrolytic paper form a partition state of approximately "101010".

Step 6: Immersion of electrolyte.

After the electrolytic paper is wound, the electrolyte is poured in to immerse the electrolyte onto the electrolytic paper. With the innovation of electrolyte formulas and the advancement of electrolytic paper manufacturing skills, the ESR value of aluminum electrolyte capacitors has gradually been improved, reaching a fraction of what it used to be.

Step 7: Assembly.

This step is to assemble the aluminum shell on the surface of the capacitor and connect the external leads. By this point, the capacitor has been fundamentally formed.

Step 8: Curl the edges.

If it is a "foreskin" capacitor, it is necessary to cover the surface of the capacitor with PVC film on the aluminum shell through this step. However, the use of PVC film in capacitors is becoming increasingly rare, mainly because this material is not suitable for environmental protection and has little to do with performance display.

Step 9: Assembly and combination.

Step 10: Charging and aging test.

Step 11: Parameter Review.

Leakage current up (LC) is the measurement of the direct current voltage applied to a capacitor. This voltage is marked on the rubber tube of the capacitor and is also known as the work voltage. The smaller the value of the direct current it passes through, the better. Capacity review: Capacity (CAP), the goal of which is to test whether its value is within the allowable deviation range. Exceeding or falling below is considered insufficient.

3DF Review: Temperature 25 ℃, frequency 120HZ, non-polar, usually 1KHZ (test conditions). Brief note: Capacitors naturally experience a loss factor in electronic circuits, and both loss and dissipation have poor meanings in Chinese. They use the opposite sides of trigonometric functions to calculate the value. DF is a commonly used term in the western region of Thailand, and edges are expressed as percentages. tan δ is a commonly used term in the local region, and it is expressed as a small number of points. Both have the same meaning, and the smaller the value, the better. The capacitor should be discharged before testing the capacity DF to avoid damaging the instrument due to the voltage carried by the capacitor flowing into it. ­    

External review: that is, the aesthetic of the appearance of capacitors (beauty pageant), it must rely on our vision to judge whether it is good or not. Originally, in every process we go through, we know what is good or bad, and when it should be removed. However, in order to prevent "losing dogs" (some bad products are not detected), some still need to review the outside, just in case.

About Us

Guangdong Fulong Electronic Technology Co., Ltd. is a private high-tech enterprise specializing in the research and development, manufacturing, and sales of aluminum electrolytic capacitors, certified by IATF16949，ISO9001, ISO14001, and ISO45001. The company has a building area of 17000 square meters and more than 50 automated production lines; The total investment is 50 million yuan (RMB), with more than 100 employees, including more than 20 engineering and technical, quality management, and production management personnel. The annual production of capacitors (4 * 5.4~16 * 21.5) is about 400 million pieces; Our products are mainly sold to domestic and international markets, and we strive to promote our company's products globally.

Jiangxi Fulong Electronic Technology Co., Ltd. is a wholly-owned subsidiary of Guangdong Fulong Electronic Technology Co., Ltd. established in Hukou County, Jiangxi Province with a total investment of 500 million yuan. It has 50 fully automated production lines and an annual output of approximately 1.2 billion capacitors (4 * 5.4~16 * 21.5).

Fulong Group has an international professional core technology research and development team for aluminum electrolytic capacitors and a global sales network. Rich experience in the design, research and development, and production management of aluminum electrolytic capacitors. The R&D team follows the technical design theory of aluminum electrolytic capacitors, complies with international and domestic legal and regulatory requirements (RoHs), and adheres to the highest international quality standards

Fulong Group has high-quality and stable raw material supply partners, and key raw materials (such as aluminum foil, electrolytic paper, etc.) are selected from well-known Japanese and Korean companies (KJCC KDKNKK, etc.), ensuring reliable and stable advantages in product quality, environmental protection, safety, and energy conservation.

Fulong Group has a group of highly qualified professional technicians and management personnel who can produce various series of sheet aluminum electrolysis products according to customer requirements. The products include high-frequency low impedance, low leakage, wide temperature, extremely low impedance, non-polar, ultra long life, medium high voltage long life, high reliability and other new types of special requirements for surface mount products; At the same time, the company's products can withstand a soldering temperature of 260 ℃, meeting the lead-free reflow soldering technology required for SMT in the whole machine factory. All technical indicators of the products have reached or exceeded the international level of similar products.

While strengthening management and expanding operational scale, Fulong Group is also committed to improving its competitiveness and customer satisfaction, continuously and steadily increasing customer and social trust, continuously meeting market demand, further optimizing environmental management and expanding social contributions, and developing together with the electronics industry.

Guangdong Follon Electronic Technology Co., Ltd.

Jiangxi Follon Electronic Technology Co., Ltd.

Address: Building 3, South District, Haishan Science and Technology Park, Hukou County, Jiujiang

City, Jiangxi Province

www.follon.com

Professional manufacturer of high-quality surface mount electrolytic capacitors