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汽车安全与节能学报 ›› 2012, Vol. 3 ›› Issue (2): 158-164.DOI: 10.3969/j.issn.1674-8484.2012.02.009

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锂离子电池各向异性导热的实验与建模

冯旭宁1,2，李建军1，王莉1，高剑1，何向明1,2 *，欧阳明高2   

  1. 1. 清华大学 核能与新能源技术研究院，北京 100084 ；
    2. 清华大学 汽车安全与节能国家重点实验室，北京 100084
  • 收稿日期:2012-04-11 出版日期:2012-06-18 发布日期:2012-07-04
  • 通讯作者: 何向明，研究室主任。hexm@tsinghua.edu.cn
  • 作者简介:冯旭宁（1988—），男（回），博士研究生。
  • 基金资助:

    国家科技部国际合作（2010DFA72760）；国家重点基础研究发展“九七三”计划（2011CB935902，
    2011CB711202）；清华大学自主科研计划(2010THZ08116，2011THZ08139，2011THZ01004)

Experiments and modeling of anisotropic thermal conductivity of lithium-ion batteries

FENG Xuning1,2, LI Jianjun1, WANG Li1, GAO Jian1, HE Xiangming1,2*, OUYANG Minggao2   

  1. 1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
    2. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
  • Received:2012-04-11 Online:2012-06-18 Published:2012-07-04

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摘要： 锂离子电池热特性影响其性能、安全和寿命，需要进行专门研究。该文建立了锂离子电池的
热模型，其中的锂离子电池被简化为具有各项异性导热的长方体。以实验确定电池的各向异性导热
系数。在导热系数和对流换热系数未知的前提下，基于建模仿真结果, 发现了3 个特征温度点对应
的等温线与导热系数和对流换热系数的关系，即“三线共点”图解法。利用该图解法所进行的仿真结果，
与单体电池的实验值相吻合。这证明：垂直于电池内部叠层方向的导热系数小于平行方向的导热系数。

关键词: 三元锂离子电池, 热特性建模, 各向异性导热系数, “三线共点”图解法

Abstract: Since thermal property affects the performance, safety and longevity of the lithium-ion battery,
specific research is necessary. This paper conducts thermal modeling of a lithium-ion battery which is
simplified as a cuboid with anisotropic thermal conductivity. Experiments were made to get the anisotropic
thermal conductivity. Supposing that the thermal conductivity and the convection coefficient are unknown,
based on model simulation, relationship was found between the isotherms of characteristic points and the
modeling thermal parameters. By analyzing the relationship, a graphic method was proposed named three lines
concurrent to determine the thermal parameters in modeling. Using the results of the graphic method, simulation
results matches well with the experimental data. The results verify that the parallel-direction thermal conductivity
is higher than the perpendicular-direction thermal conductivity in punch type lithium-ion batteries.

Key words: lithium-ion battery, thermal modeling, anisotropic thermal conductivity, graphic method of “three lines concurrent”

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