Abstract
Current studies on the mechanical abuse of lithium-ion batteries usually focus on the mechanical damage process of batteries inside a jelly roll. In contrast, this paper investigates the internal short circuits inside batteries. Experimental results of voltage and temperature responses of lithium-ion batteries showed that battery internal short circuits evolve from a soft internal short circuit to a hard internal short circuit, as battery deformation continues. We utilized an improved coupled electrochemical-electric-thermal model to further analyze the battery thermal responses under different conditions of internal short circuit. Experimental and simulation results indicated that the state of charge of Li-ion batteries is a critical factor in determining the intensities of the soft short-circuit response and hard short-circuit response, especially when the resistance of the internal short circuit decreases to a substantially low level. Simulation results further revealed that the material properties of the short circuit object have a significant impact on the thermal responses and that an appropriate increase in the adhesion strength between the aluminum current collector and the positive electrode can improve battery safety under mechanical abusive conditions.
Highlights
Governments of the world actively promote new energy vehicles, especially electric vehicles (EVs), to address the energy crisis and environmental problems
This study focuses on the internal short circuit (ISC) evolution and the subsequent thermal response of a Li-ion battery under mechanical abusive conditions
This indicated that the soft ISC occurring in Stage II had evolved to a hard ISC occurring in Stage III
Summary
Numerical models were developed to explore the fundamental mechanisms [26,27,28,29,30], and their findings are summarized in [31] In these studies, the coupling of a battery cell electrochemical performance and its thermal behavior during the ISC process was ignored. We utilized an improved coupled electrochemical-electric-thermal model, which considers the material property and the damaged area of the short-circuit object to investigate the thermal responses of Li-ion batteries after ISC.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.