加载角度和线型缺口对锂离子电池隔膜拉伸性能的影响

薛鹏程; 范文杰; 王根伟; 王彬

doi:10.11858/gywlxb.20190765

加载角度和线型缺口对锂离子电池隔膜拉伸性能的影响

doi: 10.11858/gywlxb.20190765

薛鹏程^{1, 2,},
范文杰^{1, 2},
王根伟^{1, 2,*, ,},
王彬^{1, 3}

1.
太原理工大学应用力学研究所，山西太原　030024
2.
太原理工大学机械与运载工程学院材料强度与结构冲击山西省重点实验室，山西太原　030024
3.
布鲁内尔大学物理科学、设计与机械学院，英国伦敦　UB83PH

基金项目: 国家自然科学基金（11872265）；山西省青年科技研究基金（201701D221142）

详细信息

作者简介:
薛鹏程（1993－），男，硕士，主要从事动力电池隔膜的力学性能研究. E-mail: 1014957490@qq.com

通讯作者:
王根伟（1974－），男，博士，副教授，主要从事新能源汽车安全与轻量化研究.E-mail: gwang@tyut.edu.cn

中图分类号: O348.3
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出版历程
- 收稿日期: 2019-04-25
- 修回日期: 2019-05-08

Effects of Loading Angle and Linear Notch on Tensile Properties of Lithium-Ion Battery Separator

XUE Pengcheng^{1, 2
,},
FAN Wenjie^{1, 2},
WANG Genwei^{1, 2,*
, ,},
WANG Bin^{1, 3}

1.
Institute of Applied Mechanics, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
2.
Shanxi Key Laboratory of Material Strength & Structural Impact, College of Mechanical and Vehicle Engineering of Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
3.
College of Engineering, Design and Physical Sciences, Brunel University, London UB83PH, UK

摘要

摘要: 锂离子电池隔膜作为防止正负极接触的物理屏障，其结构完整性对于电池安全至关重要。进行了4种商业隔膜单轴拉伸实验，分析加载角度和线型缺口对隔膜材料拉伸强度、弹性模量、断裂模式的影响。结果表明：无缺口试样在0°方向上的拉伸强度最大，90°方向上拉伸强度最小；当两个无缺口试样的加载角度互为补角时，它们的拉伸强度接近。对于缺口试样而言，缺口方向沿着90°的试样有最大破坏载荷；线型缺口试样有更高的弹性模量，但是塑性变形大幅减少。无缺口试样和缺口试样在拉伸过程中的断裂模式相同，即除0°试样沿横向断裂外，其他加载角度的试样均沿着纵向断裂。
- 锂离子电池 /
- 隔膜 /
- 单轴拉伸 /
- 加载角度 /
- 线型缺口
Abstract: Lithium-ion battery separators act as the physical barriers to prevent contact between the positive and negative electrodes, and their structural integrity is critical to battery safety. In this paper, uniaxial tensile tests were carried out on four kinds of commercial separators, and the effects of loading angle and linear notch on tensile strength, elastic modulus and fracture mode were analyzed. The results show that the tensile strength of the 0° specimens without notch is the largest and the tensile strength of 90° specimens is the smallest. When the loading angles of two notched specimens are supplementary, their tensile strength is close to each other. For the notched specimens, the failure load is the largest when the notched direction is along 90°. The linear notched specimens have higher elastic modulus, but the plastic deformation is greatly reduced. Both the unnotched specimens and the notched specimens are broken along MD (machine direction) except for the 0° specimens along TD (transverse direction).
- lithium-ion battery /
- separator /
- uniaxial tension /
- loading angle /
- linear notch

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图 1 SC-16的SEM图像

Figure 1. SEM image of SC-16

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图 2 加载角度示意图

Figure 2. Schematic of the loading angle

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图 3 线型缺口试样示意图

Figure 3. Schematic of the linear notched specimen

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图 4 无缺口试样在8个加载角度上的应力-应变曲线

Figure 4. Stress-strain curve of unnotched specimens at 8 loading angles

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图 5 S-25的0°缺口试样在不同位置处的力-位移曲线

Figure 5. Load-displacement curve of the 0° notched specimens at different positions for S-25

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图 6 缺口试样与无缺口试样应力-应变曲线的比较

Figure 6. Comparison of stress-strain curves between notched specimens and unnotched specimens

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表 1 不同加载角度下无缺口试样的拉伸强度

Table 1. Tensile strength of unnotched specimens at different loading angles

Specimen type	σ_θ/MPa								σ₀/σ₉₀
Specimen type	0°	30°	45°	60°	90°	120°	135°	150°	σ₀/σ₉₀
S-25	107.8 ± 10.8	26.3 ± 1.7	17.3 ± 0.3	13.1 ± 0.4	10.0 ± 0.2	13.8 ± 0.5	19.1 ± 1.2	25.4 ± 1.2	10.8
S-16	127.3 ± 10.6	37.7 ± 1.5	25.4 ± 1.2	19.7 ± 0.3	15.7 ± 0.5	19.4 ± 0.5	25.7 ± 1.1	38.3 ± 0.8	8.1
SC-16	101.2 ± 4.9	30.9 ± 1.8	21.6 ± 1.1	16.9 ± 0.4	13.8 ± 0.4	17.1 ± 0.5	20.8 ± 1.7	29.5 ± 3.1	7.3
DC-16	98.7 ± 7.7	27.1 ± 2.1	18.1 ± 0.8	15.2 ± 0.4	13.8 ± 0.4	15.1 ± 0.6	19.2 ± 0.4	26.5 ± 1.7	7.2

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