Rundzellen

Rundzellen, also known as cylindrical cells, are a common type of battery cell distinguished by their cylindrical shape. They are widely used in portable electronic devices, electric vehicles, and various industrial applications due to their robust construction and energy density. Common chemistries for rundzellen include lithium-ion (such as 18650, 21700, and 4680 formats), nickel-metal hydride (NiMH), and nickel-cadmium (NiCd).

The construction of a rundzelle typically involves a spirally wound electrode assembly consisting of a positive electrode, a negative electrode, and a separator, all contained within a metal casing. This casing provides structural integrity and serves as one of the electrical terminals. The internal components are immersed in an electrolyte that facilitates ion transport between the electrodes during charging and discharging.

The specific dimensions of rundzellen are often indicated by a code, where the first two digits represent the diameter in millimeters and the last two digits represent the height in millimeters. For instance, an 18650 cell is approximately 18 mm in diameter and 65 mm in height. Different sizes offer varying capacities and power outputs, catering to diverse application needs.

Rundzellen offer several advantages, including good mechanical stability, relatively low manufacturing costs, and a mature production infrastructure. However, they can be less space-efficient compared to prismatic or pouch cells in certain applications. Advancements in battery technology continue to improve the performance, safety, and energy density of rundzellen.