In battery construction, maintaining the structural integrity of the cells is paramount. Pure nickel foil contributes significantly to the mechanical strength of batteries, especially in cylindrical cells like 18650, 26650, 32700, and 32650. These cell formats are widely used due to their robust structure and high energy density. The use of pure nickel foil in these batteries helps maintain the shape and structural integrity during repeated charging and discharging cycles. This durability ensures that the batteries can withstand mechanical stresses, thermal variations, and potential physical impacts, making them reliable for various applications ranging from portable electronics to electric vehicles.