当前位置: X-MOL 学术Int. J. Plasticity › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Deformation and failure of lithium-ion batteries treated as a discrete layered structure
International Journal of Plasticity ( IF 9.8 ) Pub Date : 2019-10-01 , DOI: 10.1016/j.ijplas.2019.06.011
Juner Zhu , Wei Li , Tomasz Wierzbicki , Yong Xia , Jonathon Harding

Abstract Safety of lithium-ion batteries under mechanical loadings is currently one of the most challenging and urgent issues facing in the Electric Vehicle (EV) industry. The architecture of all types of large-format automotive batteries is an assembly of alternating layers of anode, separator, and cathode. The anode is composed of a very thin copper foil double-side coated with graphite powders, while the cathode is an aluminum foil with the active material coating. Each of the five components may develop a large plastic deformation until fracture. This study focuses on the effect of the properties of the coated materials on the local and global responses of a battery cell. Both anode and cathode coatings are described by the Drucker-Prager/Cap plasticity model, which is carefully calibrated through axial and lateral compression tests and closed-die compaction test. A separate experimental effort is put on finding the strength of the interface between the foils and the granular materials with a binder. The main new finding is that in the cases of plane-strain and axisymmetric loadings, the failure of cells proceeds in two stages. First, the shear bands localize along discrete lines. Then, fracture develops inside the shear bands due to large local strain gradient. The present model is applied to study the deformation and strength of large-format pouch cells subjected to local indentations by rigid punches. The prediction of the present model follows closely the measured load-displacement curve and captures with good accuracy the magnitude of the peak load and the corresponding critical displacement. In addition, an excellent correlation is achieved between the calculated profile of the through-thickness crack and the result of the micro CT scan. The present detailed computational model should be useful in the battery design process and will serve as an important new computational tool for assessing the safety of lithium-ion batteries against mechanical loading.

中文翻译:

锂离子电池作为离散层状结构处理的变形与失效

摘要 机械负载下锂离子电池的安全性是目前电动汽车 (EV) 行业面临的最具挑战性和紧迫性的问题之一。所有类型的大型汽车电池的架构都是由交替的阳极、隔膜和阴极层组装而成。阳极由非常薄的双面涂有石墨粉的铜箔组成,而阴极是带有活性材料涂层的铝箔。五个部件中的每一个都可能产生大的塑性变形直至断裂。这项研究的重点是涂层材料的特性对电池单元局部和全局响应的影响。阳极和阴极涂层均由 Drucker-Prager/Cap 塑性模型描述,它通过轴向和横向压缩测试以及闭模压实测试仔细校准。一项单独的实验工作是用粘合剂寻找箔和颗粒材料之间界面的强度。主要的新发现是,在平面应变和轴对称载荷的情况下,单元的失效分两个阶段进行。首先,剪切带沿离散线定位。然后,由于大的局部应变梯度,在剪切带内部发生断裂。本模型用于研究受到刚性冲头局部压痕的大尺寸软包电池的变形和强度。本模型的预测密切遵循测量的载荷-位移曲线,并以良好的精度捕捉峰值载荷的大小和相应的临界位移。此外,计算的全厚度裂纹轮廓与显微 CT 扫描结果之间实现了极好的相关性。目前的详细计算模型在电池设计过程中应该是有用的,并将作为一种重要的新计算工具,用于评估锂离子电池对机械载荷的安全性。
更新日期:2019-10-01
down
wechat
bug