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[机电][电池热性][中英对照]圆柱形锂离子电池有限元热模型与仿真论文摘要

一线实稿 樊明璨 来源:樊明璨博客 624浏览 0评论

ionbattery

摘要:由于在能量密度、功率密度、循环寿命等方面的优势,锂离子电池已逐步成为电动车辆的主要能量源。为适应车辆应用环境温度的宽范围变化,解决动力电池组内部温度不一致的问题,本文基于有限元法、锂离子电池物理结构及化学反应过程建立了一款圆柱形锂离子电池的热特性模型,通过实验或数值计算方法确定了该模型的初始条件、边界条件以及电池各组成部分的热特性参数。进行了不同环境温度、不同倍率的电池放电实验以及同等工况下的有限元模型仿真,表明仿真与试验结果的相对误差在10%左右,验证了该有限元热特性模型仿真与实验测试具有很好的拟合度,证明该模型建立方法可有效应用于圆柱形锂离子电池热特性仿真。

关键词: 锂离子电池; 有限元法; 热模型; 温度分布

: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

: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

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