LIB Cell Casing

Purpose and Function

The casing provides:

• Mechanical protection against shocks, vibrations, and external impacts
• Electrical insulation to prevent short circuits
• Thermal stability to withstand temperature changes during charging/discharging
• Containment of gases and electrolyte to prevent leakage or explosion

Types of Cell Casings

Depending on the cell format, casings vary in material and structure:

• Cylindrical Cells: Made from nickel-plated steel or aluminum (e.g., 18650, 21700 cells)
• Prismatic Cells: Use aluminum or stainless-steel cans with welded or sealed tops
• Pouch Cells: Use laminated aluminum–polymer films, which are lightweight and flexible