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汽车安全与节能学报

JASE ›› 2019, Vol. 10 ›› Issue (1): 106-111.DOI: 10.3969/j.issn.1674-8484.2019.01.014

• 汽车节能与环保 • 上一篇    下一篇

三元锂离子动力电池挤压损伤容限的试验研究

许 万1，周大永2   

  1. （1. 湖北工业大学 机械工程学院，武汉 430068，中国； 2. 浙江吉利汽车研究院有限公司，杭州 311228，中国）
  • 收稿日期:2018-11-22 出版日期:2019-03-31 发布日期:2019-04-01
  • 作者简介:第一作者 / First author ： 许万（1979—），男（汉），湖北，教授。E-mail: xuwan@mail.hbut.edu.cn。
  • 基金资助:

    国家自然科学基金资助项目(51405144)

Experimental study of extrusion damage tolerance in a NCM Li-ion power battery

XU Wan1, ZHOU Dayong2   

  1. (1. Mechanical Engineering Institute, Hubei University of Technology, Wuhan 430068, China; 2. Zhejiang Geely Automobile Research Institute Ltd., Hangzhou 311228, China)
  • Received:2018-11-22 Online:2019-03-31 Published:2019-04-01

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摘要：

      电动汽车发生碰撞后动力电池受到挤压变形时，存在热失控风险。为得到电池的挤压损伤容限，该文基于某镍钴锰（Li-NiCoMnO2，NCM）三元锂离子动力电池进行挤压试验。对电芯不同方向进行挤压试验，分析不同方向抗挤压能力以及发生挤压热失控的失效模式；对模组分别进行2 个方向的挤压试验，研究其挤压失效形式。结果表明：电芯在长度方向比宽、高方向，更易发生挤压失效；挤压失效模式具有不确定性；该电芯挤压损伤容限为10 mm；模组长度方向挤压更易发生热失控，与电池单体一致。该结果可为动力电池包的安全布置设计及仿真失效判定提供参考。

关键词: 电动汽车(EV) , 汽车碰撞 , 锂离子动力电池 , 热失控 , 挤压失效 , 损伤容限

Abstract:

There is a risk of thermal runaway of power battery after collisions of electric vehicles. This paper analyzed extrusion thermal runaway based on a Li-NiCoMnO2 (NCM) power battery to obtain damage tolerance of battery. The cells of battery were extruded in different directions to analyze the extrusion resistance and the
failure mode of the extrusion thermal runaway. Modules were extruded respectively in two directions to analyze the extrusion failure mode. The results show that the electric cell is more prone to extrusion and failure in length direction than that in width and height directions. The extrusion failure mode is uncertain. The extrusion damage tolerance is 10 mm. The modules are more prone in length direction than that in width and height directions to thermal runaway being consistent with battery cells. The results can provide references for the safety layout design and for the simulation failure determination of power battery packs.

Key words: electric vehicle (EV) , vehicle collision , Li-ion power battery ,  thermal runaway , extrusion failure ,  damage tolerance