Abstract
Multiphysics modeling permits a detailed investigation of complex physical interactions and heterogeneous performance in multiple electro-active layers of a large-format Li-ion cell. For this purpose, a novel 3D multiphysics model with high computational efficiency was developed to investigate detailed multiphysics heterogeneity in different layers of a large-format pouch cell at various discharge rates. This model has spatial distribution and temporal evolution of local electric current density, solid lithium concentration and temperature distributions in different electro-active layers, based on a real pouch cell geometry. Other than previous models, we resolve the discharge processes at various discharge C-rates, analyzing internal inhomogeneity based on multiple electro-active layers of a large-format pouch cell. The results reveal that the strong inhomogeneity in multiple layers at a high C-rate is caused by the large heat generation and poor heat dissipation in the direction through the cell thickness. The thermal inhomogeneity also strongly interacts with the local electrochemical and electric performance in the investigated cell.
Highlights
There is a growing demand for advanced energy storage systems
The salt concentration in electrode domains is related to the local electrochemical reaction rates, which originate from the pore-wall fluxes at electrode-electrolyte interfaces
An efficient 3D multiphysics model was developed for investigating physical interactions and heterogeneity of a 12 Ah large-format pouch cell
Summary
There is a growing demand for advanced energy storage systems. Lithium-ion batteries (LiBs) have become a high-demand energy technology due to their high energy density. By combining two hierarchical frameworks [14,15] for good management of coupling interfaces and submodel solvers, a 3D multiphysics model is developed for the prediction and investigation of internal inhomogeneity regarding cell structures, which is applicable to large-format pouch cells with multiple electro-active layers. This modeling method has already helped us with implementation of a sensitivity analysis work [16] This model is applied to reveal the thermal-electric-electrochemical interactions and to illustrate local heterogeneous evolutions of physical processes in different layers under various discharge C-rates within the pouch cell. The submodels and their coupling approach is provided in detail
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
