吉林大学学报(工学版) ›› 2020, Vol. 50 ›› Issue (5): 1574-1583.doi: 10.13229/j.cnki.jdxbgxb20190458

• 车辆工程·机械工程 • 上一篇    

高温和荷电状态对锂离子电池单体力学响应的耦合影响

高菲1,2(),肖阳3(),张文华3,祁锦轩3,李子樵3,马骁远3   

  1. 1.吉林大学 汽车仿真与控制国家重点实验室, 长春 130022
    2.吉林大学 生物与农业工程学院，长春 130022
    3.吉林大学 汽车工程学院, 长春 130022
  • 收稿日期:2019-05-13 出版日期:2020-09-01 发布日期:2020-09-16
  • 通讯作者: 肖阳 E-mail:gaofei123284123@jlu.edu.cn;xiaoy2016@jlu.edu.cn
  • 作者简介:高菲（1989-），女，博士，在站博士后.研究方向：汽车动态建模与仿真.E-mail:gaofei123284123@jlu.edu.cn
  • 基金资助:
    国家自然科学基金项目(51705190);汽车仿真与控制国家重点实验室开放基金项目(20180102);国家重点研发计划项目(2017YFB0102600)

Influence of coupling of elevated temperature and state of charge on mechanical response of Li⁃ion battery cells

Fei GAO1,2(),Yang XIAO3(),Wen-hua ZHANG3,Jin-xuan QI3,Zi-qiao LI3,Xiao-yuan MA3   

  1. 1.State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China
    2.College of Biological and Agricultural Engineering, Jilin University, Changchun 130022, China
    3.College of Automotive Engineering, Jilin University, Changchun 130022, China
  • Received:2019-05-13 Online:2020-09-01 Published:2020-09-16
  • Contact: Yang XIAO E-mail:gaofei123284123@jlu.edu.cn;xiaoy2016@jlu.edu.cn

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摘要：

针对锂离子电池机械完整性在高温环境下的研究需求，本文对不同荷电状态(SOC）的圆柱型锂离子电池单体进行高温搁置和高温循环处理，并对处理后的电池单体进行径向挤压试验。试验结果表明:高SOC的电池单体经40 °C以上的高温搁置后受压时往往会因结构软化而提早发生内短路，搁置温度越高电池抗变形能力越低；高温短期循环会提高电池单体的抗变形能力。

关键词: 车辆工程, 高温, 锂离子电池单体, 力学响应

Abstract:

To meet the research demand of lithium-ion batteries under high temperature, cylindrical lithium-ion battery cells with different State Of Charge (SOC) were placed at elevated temperature for rest and cycle, and then these battery cells were compressed in radial direction in this paper. The experiment results indicate that the cells with a high SOC tend to be short-circuited early under compression after resting at a temperature of 40 °C or higher. This is due to the structural softening of the cells. The higher the rest temperature, the lower the resistance of the high SOC cells to deformation. Short cycling under high temperature would increase the resistance of the cells to deformation.

Key words: vehicle engineering, elevated temperature, lithium-ion battery cell, mechanical response

中图分类号: 

  • U41

图1

圆柱型锂离子电池的结构组分示意图"

图2

力学测试及电池受压示意图"

图3

60 °C高温搁置后的电池单体在挤压过程中的名义应力、名义模量、电压和表面温度随时间的变化曲线以及为电池挤压过程中对应点的热像图"

图4

电池单体经不同温度搁置后在受压过程中的力学变化曲线"

图5

不同SOC的电池单体的搁置温度与其力学性能的关系图"

图6

电池单体在不同环境温度下搁置过程中的电压和表面温度随时间变化曲线图"

表1

高温搁置后的电池单体的平均欧姆阻抗"

SOC平均欧姆阻抗/mΩ
25 °C40 °C60 °C80 °C
018.518.518.518.7
0.630.730.630.530.3

图7

在60 °C高温下循环前后的电池单体各项属性变化曲线"

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