Derivation and FEM Validation of Similarity Criterions of Temperature Field Inside of Lithium-ion Battery

Abstract:

To acurately predict the temperature fields inside a lithium-ion battery is key technology for the enhancement of battery thermal managment and the improvement of battery performances. In this paper，the dimensional analysis method is uded to derive similarity criterions and the similarity coefficients of battery interior temperature fields, based on the governing partial differential equations describing the three dimensional transient temperature field. To validate the similarity criterions and the similarity coefficients, three dimensional finite element models of battery temperature field are established, on the assumption that the battery has single-layer structure and multi-layers structure. The simulation results show that the similarity criterions and the similarity coefficients are certified correct, and they can be used for battery temperaure fields simulation and analysis.