锂离子电池内部温度场的相似准则推导与有限元验证

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

摘要:

对锂离子电池的内部温度场进行准确预测，是改善电池热管理，提高电池性能的核心关键技术。从三维非稳态导热微分方程出发，利用无量纲分析法推导了锂离子电池内部温度场相似所应满足的相似准则, 并确定了实物对象与模拟对象之间的温度场相似关系。利用ANASYS软件进行了单层结构和多层结构锂离子电池温度场的有限元建模与计算,验证了所建立相似准则和相似关系的正确性。

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.