轴向压缩下圆柱形动力锂离子电池的性能

李梦; 柳小伟; 张舒; 宋辉; 王根伟; 王彬

doi:10.11858/gywlxb.20200647

轴向压缩下圆柱形动力锂离子电池的性能

doi: 10.11858/gywlxb.20200647

李梦^{1, 2,},
柳小伟^{1, 2},
张舒^{1, 2},
宋辉^{1, 2},
王根伟^{1, 2,*, ,},
王彬^{1, 3}

1.
太原理工大学机械与运载工程学院应用力学研究所，山西太原　030024
2.
材料强度与结构冲击山西省重点实验室，山西太原　030024
3.
伦敦布鲁内尔大学机械与航空工程系，英国伦敦　UB83PH

基金项目: 国家自然科学基金（11872265）；山西省自然科学基金（201901D111087）

详细信息

作者简介:
李　梦（1994－），女，硕士研究生，主要从事动力电池安全性究. E-mail：2795997261@qq.com

通讯作者:
王根伟（1974－），男，博士，副教授，主要从事冲击动力学研究. E-mail：gwang@tyut.edu.cn

中图分类号: O347
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出版历程
- 收稿日期: 2020-12-03
- 修回日期: 2020-12-24

Performance of Cylindrical Power Lithium-Ion Battery under Axial Compression

LI Meng^{1, 2
,},
LIU Xiaowei^{1, 2},
ZHANG Shu^{1, 2},
SONG Hui^{1, 2},
WANG Genwei^{1, 2,*
, ,},
WANG Bin^{1, 3}

1.
Institute of Applied Mechanics, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
2.
Key Laboratory of Material Strength and Structure Impact in Shanxi Province, Taiyuan 030024, Shanxi, China
3.
Department of Mechanical and Aerospace Engineering, London Brunel University, London UB83PH, UK

摘要

摘要: 动力电池的安全问题制约了电动汽车的推广和发展，轴向压缩是锂离子电池的一种重要的破坏工况。通过实验方法，研究了18650锂离子电池在轴向压缩载荷下的安全性能，探讨了荷电状态分别为60%、80%、100%时电池的载荷、电压、温度的变化特征，分析了轴向压缩载荷下电池的失效过程。研究表明：轴向压缩过程中电压均出现特有的台阶式下降，极限载荷和温度骤升几乎同时发生；电池正极的凹槽结构诱导电池在靠近正极的侧面破裂。对比轴向压缩实验和径向平板压缩实验发现，动力电池轴向压缩热失控程度弱于径向平板压缩。
- 圆柱形动力锂离子电池 /
- 轴向压缩 /
- 安全性能 /
- 失效模式
Abstract: The safety of power batteries have always restricted the promotion and development of electric vehicles. The axial compression of batteries is an important issue leading to damage. The safety performance of 18650 lithium-ion battery under axial compression was studied by experiments. The characters of load, voltage and temperature of batteries with state of charge of 60%, 80%, and 100% were discussed, and the failure process of the battery under axial compression was analyzed. It was found that the voltage during the axial compression process showed a unique stepped drop, the maximum load and a sudden temperature increase occurred almost simultaneously; the local groove structure of the positive induced the battery to rupture near the positive. Comparing the batteries in axial compression with the batteries of the radial two-plate compression, it was found that the thermal runaway of power battery in axial compression is weaker than that in radial two-plate compression.
- cylindrical power lithium-ion battery /
- axial compression /
- safety properties /
- failure mode

HTML全文

图 1 18650锂离子电池的CT图像

Figure 1. CT image of 18650 lithium-ion battery

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图 2 不同加载速度下100% SOC电池的载荷-位移曲线

Figure 2. Load-displacement curves of 100% SOC battery at different loading speeds

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图 3 100% SOC电池的载荷、电压、温度-位移曲线

Figure 3. Load-, voltage- and temperature-displacementcurves of the 100% SOC battery

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图 4 60%和80% SOC电池的载荷、电压、温度-位移曲线

Figure 4. Load-，voltage- and temperature-displacement curves of 60% and 80% SOC battery

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图 5 不同SOC电池的峰值力

Figure 5. Peak force of batteries with different SOCs

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图 6 不同SOC电池的最高温度

Figure 6. Maximum temperature of batterieswith different SOCs

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图 7 100% SOC电池的载荷、温度-位移曲线

Figure 7. Load-, temperature-displacementcurves of the 100% SOC battery

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图 8 轴向压缩过程中的电池及其红外成像(a)～(g)以及破坏后的电池实物(h)

Figure 8. Infrared images and photos of the battery during axial compression (a)–(g) and the battery after destruction (h)

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图 9 18650锂离子电池正极端（a）及CT图像（b）

Figure 9. Positive electrode of 18650 lithium-ion battery (a) and CT image (b)

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