关键词： 锂离子电池; 有限元法; 热模型; 温度分布
劣：Abstract: Due to its advantages in long cycle life, high energy and power density, Li-ion battery has been adopted as one of the most important energy sources for electric vehicles. However, the performance of Li-ion battery is largely dependent on the surrounding temperature. In order to tackle the problem of inconsistency in temperature distribution among battery cells in the pack, a thermal model based on the finite element method was developed. Physical structure and chemical reaction of the cell were considered, and the initial conditions, boundary conditions and thermal characteristic parameters of the components were also determined through calculation or experiment. The discharge thermal characteristics of the cylindrical Li-ion battery cell were further investigated. In addition, experiments were conducted to verify the accuracy of the model. Comparing the theoretical analysis and experimental results, it shows that the relative errors between the simulation and the test are about 10% at varied ambient temperatures and discharge rates, which means that the simulated results can fit well with the experiments. Therefore, the model can be efficiently applied to predict the thermal characteristics of Li-ion battery.
Keywords: Li-ion battery; Finite element method; Thermal model; Temperature distribution
校：Abstract: Thanks to its advantages in energy density, power density and cycle life and other aspects, lithium ion battery has gradually become the major energy source of electric vehicles. In order to adapt to the wide varying range of vehicle’s application environment temperature and resolve the inconsistent internal temperature issue of power battery pack, this paper builds a thermal characteristic model of cylindrical lithium ion battery according to the finite element method as well as the physical structure and chemical reaction process of lithium ion battery, and also determines its initial conditions and boundary conditions of this model as well as the thermal characteristic parameters of various battery components using either experiments or numerical computation method. Moreover, the battery discharge experiments under different ambient temperatures and amplification factors as well as the finite element model simulation under identical conditions are also performed, which indicate that the relative error between the simulation result and the experiment one is 10% or so, and verify that the fitting between the simulation and the experiments is quite good, and also prove that the modeling method can be effectively applied to the thermal characteristic simulation of cylindrical lithium ion battery.
Keywords: lithium ion battery; finite element method; thermal model; temperature distribution