RETRACTED: Testing and impact modeling of lithium-ion prismatic battery under quasi-static and dynamic mechanical abuse

Understanding the failure behavior of lithium-ion batteries under mechanical abuse is essential for the safety design of electric vehicles (EV). Here, the failure behavior and mechanical properties of the lithium-ion prismatic batteries (LPB) under quasi-static and dynamic loads are investigated experimentally through universal test machine (2 mm/min) and drop tower (1 m/s and 5 m/s), respectively. The results show that load velocity has a significant effect on the failure behaviors and mechanical properties of LPB. The main failure behavior of LPB under cylindrical impactor in the X directions is the fracture of enclosure as well as the bulking of jellyrolls, while that in the Y direction is the wrinkle of enclosure as well as the delamination and fold of jellyrolls. When the battery under ball impactor in the Z direction, its main failure behavior is the fracture of jellyrolls. Furthermore, the homogenous models of LPB are developed to make the crash simulation of full EV feasible. Under the impact in the Y and Z directions, the homogenous model possesses higher prediction accuracy on mechanical properties than detailed model. More importantly, its efficiency is approximately 8.8 times higher than detailed model according to the solving time. Then, the damage tolerance of LPB is explored to indicate the short-circuit of battery. This investigation is anticipated to provide some fundamental data for EV safety design.