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FROM:
Lubing Wang (1,2), Sha Yin (1,2), Zhexun Yu (3), Yonggang Wang (4), T.X. Yu (5), Jing Zhao (6), Zhengchao Xie (6), Yangxing Li (3), Jun Xu (7,8)
(1) Department of Automotive Engineering, School of Transportation Science an Engineering, Beihang University, Beijing, 100191 ,China
(2) Advanced Vehicle Research Center (AVRC), Beihang University, Beijing, 100191, China
(3) Central Research Institute, Huawei Technologies Co., LTD, Longgang District, Shenzhen, 518129, China
(4) Mechanics and Materials Science Research Center, Ningbo University, Zhejiang 315211, China
(5) Department of Mechanical & Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
(6) Department of Electromechanical Engineering, University of Macau, 999078, Macau
(7) Department of Mechanical Engineering and Engineering Science, The University of North Carolina at Charlotte, Charlotte, NC 28223, United States
(8) North Carolina Motorsports and Automotive Research Center, The University of North Carolina at Charlotte, Charlotte, NC 28223, United States
“Unlocking the significant role of shell material for lithium-ion battery safety”, Materials and Design, Vol. 160, pp 601-610, 2018
ABSTRACT: The cylindrical lithium-ion battery has been widely used in 3C, xEVs, and energy storage applications and its safety sits as one of the primary barriers in the further development of its application. Among all cell components, the battery shell plays a key role to provide the mechanical integrity of the lithium-ion battery upon external me- chanical loading. In the present study, target battery shells are extracted from commercially available 18,650 NCA (Nickel Cobalt Aluminum Oxide)/graphite cells. The detailed material analysis is conducted to reveal a full under- standing of the material. Then, the dynamic behavior of the battery shell material is experimentally investigated. Both theoretical constitutive and numerical models have been developed, capable to describe mechanical behav- iors of the battery shell material upon impact loading. It is the first time to discover that the strain rate effect of the shell material shall be considered for the mechanical integrity of the battery and high strength of the shell mate- rial may contribute to an early short-circuit triggering. The quantitative relationship is also established between short-circuit and material strength. Results lay a solid foundation towards providing a theoretical safety design guidance for the shell material choice of cylindrical lithium-ion batteries.
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