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Comparative Study on the Electrochemical Properties of Cylindrical and Pouch-Type Lithium Ion Battery

As the field expands from portable electronic devices to large energy storage devices such as electric vehicles, more reliable and innovative battery technologies are more important than ever.
 Currently, there are three types of lithium battery packaging: cylindrical, prismatic and pouch. Cylindrical batteries with a cylindrical shape and structure were one of the first mass-produced battery types and are still mass-produced and dominate in some applications. On the other hand, prismatic batteries are gaining popularity due to their high capacity, thin form, and efficient use of space. Due to the angular shape, multiple cells can be easily connected to form larger packs. Finally, pouch batteries are known for their lighter construction, using a sealed flexible foil as the packaging material.
 Each of these battery types offers a set of advantages and disadvantages. There is no clear winner, but the battery you choose can influence your product design in many ways. For example, each of these battery form factors can have a different temperature distribution and heat transfer model.
 In this study, a cylindrical battery and a pouch-type battery of the same capacity were manufactured using the same four major materials (positive electrode, negative electrode, separator, and electrolyte), respectively, to study the cell chemical characteristics of Li-ion secondary batteries. In particular, it is intended to provide a field to which each type of lithium ion secondary battery can be applied by understanding the characteristics of thermal and deterioration.