Identification of elastic and plastic properties of aluminum-polymer laminated pouch film for lithium-ion batteries : A hybrid experimental-numerical scheme

Lithium-ion batteries (LIBs) are crucial components for electric vehicles (EVs), and their mechanical and structural stabilities are of paramount importance. In this study, the mechanical properties of an aluminum-laminated pouch sheet, as a key component of pouch-type LIBs, are examined. Aluminum-laminated pouch sheets have rarely been systematically investigated in the past. Owing to the complex composite structure of pouch sheets having metallic and polymeric materials, fully understanding and describing their mechanical responses is scientifically challenging without data or knowledge of the individual materials. Therefore, the prime novelty of the present study is to identify the elastic and plastic properties of the individual material components of a pouch sheet. In particular, we propose an efficient and user-friendly methods that physically separate all material layers by applying a novel hybrid experimental-numerical method based on the full-field strain measurement and finite element simulation. The identified mechanical properties and their constitutive models are validated using a tensile test and the square cup formability test of the pouch sheet. The determined data from the proposed methods can provide valuable insights into the mechanical behavior of LIBs, which can assist the new design of pouch sheets used for more mechanically stable Li-ion batteries with enhanced energy storage performance.