Principle of automatic packaging of capacitor aluminum shell

What is an aluminum electrolytic capacitor?

As is the case with all capacitors, an aluminum electrolytic capacitor comprises two electrically con-ductive material layers that are separated by a dielectric layer. One electrode (the anode) is formed by an aluminum foil with an enlarged surface area. The oxide layer (Al2O3) that is built up on this is used as the dielectric.

What are the characteristics of aluminum capacitors?

The essential property of a capacitor is to store electrical charge. The amount of electrical charge (Q) in the capacitor (C) is proportional to the applied voltage (U). d = thickness of the dielectric (oxide layer in aluminum capacitors) (m). Characteristics of aluminum capacitors vary with temperature, time and applied voltage.

Can aluminum electrolytic capacitors be stored at high temperature?

Our aluminum electrolytic capacitors can be stored without damage at ambient temperatures rang-ing from typical –55 °C up to the upper category temperature. However, it must be taken into account that storage at elevated temperatures will affect leakage cur-rent, useful life and solderability.

What is the international standard for aluminum electrolytic capacitors?

The international standard for aluminum electrolytic capacitors is IEC 60384-4. The sectional specification mentioned above is complemented by a set of detail specifications that applies to specific design types (e.g. electrolytic capacitors with axial wire leads).

What is the dielectric layer of an aluminum electrolytic capacitor?

The dielectric layer of an aluminum electrolytic capacitor is created by anodic oxidation (forming) to build up an aluminum oxide layer on the foil. The layer thickness increases in proportion to the form-ing voltage at a rate of approximately 1.2 nm/V.

What is the anode of an aluminum electrolytic capacitor?

The anode of an aluminum electrolytic capacitor is an aluminum foil of extreme purity. The effec-tive surface area of this foil is greatly enlarged (by a factor of up to 200) by electrochemical etch-ing in order to achieve the maximum possible capacitance values.