| 李军奎,习会峰*,赵桂成,何陵辉.锂离子电池的PP隔膜平面各向异性性能研究[J].实验力学,2021,36(6):762~770 |
| 锂离子电池的PP隔膜平面各向异性性能研究 |
| Study on the planar anisotropy characteristics of PP separators for lithium-ion batteries |
| 投稿时间：2020-07-25 修订日期：2020-10-18 |
| DOI：10.7520/1001-4888-20-146 |
| 中文关键词: 隔膜 平面各向异性 屈服准则 数字图像相关技术 |
| 英文关键词:separator plane anisotropy hill yield criterion DIC technique |
| 基金项目: |
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| 中文摘要: |
| 隔膜在锂电池中起着重要作用，一是隔离正级和负极，二是构建锂离子迁移通道。目前锂电池有限元模型大部分采用均质化模型，导致锂电池的内短路失效时的计算结果不准确；少部分采用精细化模型，由于各向异性隔膜的基本力学参数不准确，限制了锂电池精细有限元模型的建立。本文采用数字图像相关技术(Digital Image Correlation，DIC)，通过不同方向单轴拉伸实验表征了聚丙烯(PP)隔膜不同方向的弹性模量、泊松比、塑性应变比、屈服准则等关键力学参数，结果表明隔膜具有高度的各向异性，文中还给出了隔膜纤维方向拉伸曲线存在两个屈服点的原因。本文获得的隔膜关键力学参数可为以后构建精细化锂电池模型的仿真提供理论基础，对其他各向异性薄膜材料的研究也有一定的参考价值。 |
| 英文摘要: |
| The separators play an important role in lithium batteries, which can isolate the positive and negative electrodes, and form the lithium ion migration channel. At present, the study on the basic mechanical parameters of separator anisotropy such as planar anisotropic yield characteristics is still lacking. There are certain restrictions on the establishment of lithium battery models. Most of present models are homogenized, resulting in inaccurate results when simulating short-circuit failure in lithium batteries. The purpose of this work is to represent the plane anisotropy yield criterion of the separators and to lay a theoretical foundation for the establishment of detailed lithium-ion battery model in the future. In this work, the anisotropy characteristics of the separators is systematically analyzed by experimental methods, and the results show that the separators are highly anisotropic. When the PP separators are stretched, the reason for the existence of two yield points in the MD stretching curve is found, and the elasticity of the PP separators and the anisotropy parameters of the yield criterion are further characterized. A basis for the simulation of the separators in the detailed lithium-ion battery model is provided, and the research methods also have some reference value for the research of other anisotropic materials. |
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