锂离子电池充放电过程中的热行为及有限元模拟研究  

Finite element analysis and thermal behavior of lithium-ion cells during charge-discharge process

作　　者：宋刘斌[1,2] 李新海[1] 王志兴[1] 郭华军[1] 肖忠良[2] 周英[2] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083 [2]长沙理工大学化学与生物工程学院电力与交通材料保护湖南省重点实验室,湖南长沙410004

出　　处：《功能材料》2013年第8期1153-1158,共6页Journal of Functional Materials

基　　金：湖南省科技重大专项资助项目(2009FJ1002&2011FJ1005);湖南省科技计划资助项目(2010FJ3167,2011GK3119&2012FJ4123);长沙理工大学电力与交通材料保护湖南省重点实验室开放基金资助项目(2013CL08)

摘　　要：采用电化学-量热法对LiFePO4锂离子电池在不同倍率下的循环产热进行了系统的研究,并基于热传导理论建立了锂离子电池热模型,采用有限元ANSYS模拟了稳态温度场。结果表明,电池充放电循环过程的总热效应表现为放热现象,发热量和热生成率均与充放电倍率成线性关系,随着倍率的增大而增大。充放电倍率和工作温度对电池内部温度分布有一定的影响。在相同倍率条件下,工作温度越高,电池内部温度场分布均匀性越差。在相同工作温度下,充放电倍率越大,电池内部温度场分布的均匀性越差。Thermal behaviors of LiFePO4 lithium-ion cells during charge and discharge process were investigated by electrochemical-calorimetric measurement. The thermal model of lithium-ion cell was established with theory of thermal conduction. The steady temperature field was simulated with ANSYS software. The results show that total heat effects during charge-discharge process of the cell were exothermic. The amount of heat and heat production rate were linear with the charge-discharge rate. With the increase of current, the amount of heat and heat production rate increased. The temperature distribution of the cell was strongly affected by charge-discharge rate and operating temperature. With the operating temperature increasing uniform temperature distribution decreased under the same rate. When the operating temperature was the same, with the rate increasing uniform temperature distribution decreased.

关 键 词：锂离子电池 热行为 LIFEPO4 热模型 温度场 

分 类 号：TM912.9[电气工程—电力电子与电力传动]