Design: Pouch cells have a flat, flexible pouch-like packaging made of aluminum or laminate. The electrodes and electrolyte are enclosed within the pouch.
Cylindrical cells have a metal casing, typically made of steel, with electrodes wound in a cylindrical shape and separated by a porous separator soaked in electrolyte.
In summary, pouch lithium-ion cells offer flexibility and higher energy density, making them suitable for slim and space-constrained applications, while cylindrical cells provide robustness, stability, and standardized form factors, making them ideal for a wide range of applications requiring durability and safety. 
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