Electronic aluminum foil

Electronic aluminum foil is a core raw material in the manufacturing of aluminum electrolytic capacitors. Its production process involves a series of complex steps, including rolling of high-purity aluminum ingots, cleaning, and slitting. In aluminum electrolytic capacitors, electronic aluminum foil is primarily used as the energy storage medium, typically serving as the anode or cathode material of the capacitor.

The Role of Electronic Aluminum Foil in Electrolytic Capacitors

• Energy Storage: Electronic aluminum foil is used for storing electrical energy in aluminum electrolytic capacitors, usually serving as the anode or cathode.
• Conductivity: The excellent conductivity of aluminum foil ensures that the capacitor can effectively conduct current during operation.
• Oxide Coating: Through anodic oxidation treatment, a high-quality aluminum oxide coating forms on the surface of the foil, creating a dielectric layer between the two conductors.

Classification of Electronic Aluminum Foil

Electronic aluminum foil operates under polarized conditions and requires high standards for material structure and corrosion resistance. It is classified into three types: cathode foil, with a thickness of 0.015mm to 0.06mm; high voltage foil, with a thickness of 0.065mm to 0.1mm; and anode foil, with a thickness of 0.06mm to 0.1mm.

High Voltage Anode Foil

High voltage anode foil is divided into two main categories: premium high voltage foil and standard high voltage foil. Premium high voltage anode foil features "two highs and one thin, " which means high purity, high cubic texture, and a thin surface oxide film. This type of product has high quality but also a high cost. Aluminum purity is greater than 99.99%, cubic texture is 96%, and vacuum heat treatment is performed under conditions of 10^-3Pa to 10^-5Pa. Standard high voltage anode foil is an economical and practical type with aluminum purity >99.98%, cubic texture >92%, and vacuum heat treatment under conditions of 10^-1Pa to 10^-2Pa.

Anode Foil

Anode foil can be classified into soft and hard types. Japan predominantly uses soft-type electrochemical corrosion, while Western Europe uses hard-type chemical corrosion. Each has its advantages and disadvantages. Soft-type foil uses high-purity aluminum (>99.85%) without copper, which is high-quality but also more expensive. Hard-type foil uses lower purity aluminum with copper, which is less expensive.

Specifications of Electronic Aluminum Foil

Electronic aluminum foil is a high-tech, high-value-added product mainly used in electrolytic capacitors and electronic components. The 1-series and 3-series aluminum alloys produced by Henan Hoamei can be used to manufacture electronic aluminum foil, with common types including 1070, 1100A, and 3003 aluminum foils.

Applications of Electronic Aluminum Foil

The extensive use of aluminum electrolytic capacitors in various fields such as electronic information industry, home appliances, automotive, aerospace, and new materials has driven a significant demand for electronic aluminum foil. Currently, aluminum electrolytic capacitors account for 45% of the total capacitor production. With the increasing popularity of electronic products and the development of the manufacturing industry, the domestic demand for electronic aluminum foil is continually growing.

Electronic aluminum foil is a critical component in aluminum electrolytic capacitors. These capacitors are widely used in various electronic and electrical devices, offering notable advantages such as compact size, high capacitance, and low cost.

Home Appliances

• Products: Televisions, refrigerators, washing machines, microwave ovens, etc.
• Role: Aluminum electrolytic capacitors in these devices are used for power filtering, noise reduction, and current stabilization to ensure stable operation.

Computers

• Products: Desktop computers, laptops, servers, etc.
• Role: Inside computers, aluminum electrolytic capacitors are used for power management and signal filtering on the motherboard, ensuring stable power supply and data processing.

Communication Equipment

• Products: Mobile phones, routers, base station equipment, etc.
• Role: Used for power filtering and signal processing in communication devices to improve communication quality and equipment stability.

Industrial Control

• Products: Automation control systems, frequency converters, motor drivers, etc.
• Role: Provides stable power supply and filtering functions, enhancing the reliability and control precision of industrial equipment.

Electric Vehicles

• Products: Electric vehicle power systems, charging stations, etc.
• Role: Used for battery management systems and motor control, improving the performance and safety of electric vehicles.

Military and Aerospace Equipment

• Products: Satellites, radar systems, missile control, etc.
• Role: Provides high reliability and stability in power management to meet the stringent requirements of harsh operating environments.

Production Process of Electronic Aluminum Foil

Electronic aluminum foil is processed from high-purity aluminum ingots through a series of steps including rolling, cleaning, and slitting, making it a key raw material for aluminum electrolytic capacitors.

• Rolling: Aluminum ingots are rolled into thin sheets.
• Cleaning: The aluminum sheets are cleaned to remove surface impurities.
• Slitting: The aluminum sheets are cut into appropriate sizes.

Electronic aluminum foil is made from aluminum material processed into foil and then treated with surface etching and re-oxidation, followed by winding to produce capacitors. Aluminum foil before etching is referred to as bright foil, after etching as etched foil, and after re-oxidation as finished foil. Electronic aluminum foil refers to bright foil and is a key raw material for producing aluminum electrolytic capacitors. Due to the sequence of manufacturing processes, it is categorized into electronic aluminum foil and electrode foil. Electrode foil includes etched foil and formed foil.

Electronic aluminum foil and electrolytic liquid together account for 30%-70% of the raw material cost of aluminum electrolytic capacitors (depending on the capacitor size), serving as energy storage and can be used as both anode and cathode in electrolytic capacitors.

As a key raw material for producing aluminum electrolytic capacitors, aluminum foil, together with electrolytic liquid, constitutes the raw material cost of aluminum electrolytic capacitors. Capacitor-grade aluminum foil includes electrode foil and electronic aluminum foil, with different processing depths. Electronic aluminum foil is a raw material for producing electrode foil.

Electronic Aluminum Foil Process Flow

Refined Aluminum (High Purity Aluminum Ingots) - Electronic Aluminum Foil (Bright Foil) - Electrode Foil (Etched Foil, Formed Foil) - Aluminum Electrolytic Capacitors - Electronic Products (e.g., Color TVs).