Cylindrical lithium batteries are a type of lithium-ion battery characterized by their cylindrical metal casing; their specific models are designated by a five-digit numerical code that indicates their diameter and height dimensions.
This category is distinguished by its high degree of manufacturing automation, excellent cell-to-cell consistency, and low production costs. The battery casings are broadly classified into two types: steel and polymer.
Based on their material systems, these batteries can be categorized into lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary material types, among others. Notably, steel-cased lithium iron phosphate batteries are widely utilized due to their exceptional cycle life and safety characteristics.
As of July 2024, mainstream models encompass specifications such as the 18650, 21700, and 26650, finding extensive application across sectors including consumer electronics, power tools, electric vehicles, and energy storage systems.
