Compressive mechanical behavior and constitutive modeling of power lithium-ion battery separators under strain rate-temperature coupling

HUANG Qingdan; LI Honggang; LI Jingqiu; KANG Huang; LIAO Xiangbiao; ZHANG Chao

doi:10.11883/bzycj-2024-0329

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HUANG Qingdan, LI Honggang, LI Jingqiu, KANG Huang, LIAO Xiangbiao, ZHANG Chao. Compressive mechanical behavior and constitutive modeling of power lithium-ion battery separators under strain rate-temperature coupling[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0329

Citation:

HUANG Qingdan, LI Honggang, LI Jingqiu, KANG Huang, LIAO Xiangbiao, ZHANG Chao. Compressive mechanical behavior and constitutive modeling of power lithium-ion battery separators under strain rate-temperature coupling[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0329

Citation:

HUANG Qingdan, LI Honggang, LI Jingqiu, KANG Huang, LIAO Xiangbiao, ZHANG Chao. Compressive mechanical behavior and constitutive modeling of power lithium-ion battery separators under strain rate-temperature coupling[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0329

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Compressive mechanical behavior and constitutive modeling of power lithium-ion battery separators under strain rate-temperature coupling

doi: 10.11883/bzycj-2024-0329

1.
School of Civil Aviation, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, China
2.
College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing 400044, China
3.
Advanced Research Institute of Multidisciplinary Sciences, Beijing Institute of Technology, Beijing 100081, China

Received Date: 2024-09-07
Rev Recd Date: 2024-11-06

Available Online: 2024-11-07

Abstract

Abstract

As a crucial component to ensure the safety and reliability of lithium-ion batteries (LIBs), the polymer separator plays a significant role in ensuring the mechanical abuse safety of the battery, and its mechanical properties have become an important indicator of battery safety performance. This study focuses on the compressive mechanical behavior of separators in prismatic power batteries under coupled strain rate and temperature conditions. A comprehensive experiment has been conducted including quasi-static and dynamic compression tests across a wide range of strain rates and temperatures. These tests assessed the separator’s mechanical behavior under different strain rates and temperature conditions, with a specific focus on properties and damage mechanism at elevated temperatures and different strain rates. The mechanical response of the separator was meticulously explored, involving an in-depth analysis of strain rate-dependent and temperature-dependent mechanical properties. The results indicated that the separator's mechanical behavior is highly sensitive to both strain rate and temperature. As the strain rate increases, the yield point is reached earlier, causing the separator to yield sooner. Additionally, both the elastic modulus and the yield stress of the separator decrease as the temperature rises. At low strain rates, the yield point shifts forward, whereas at high strain rates, the yield strain increases with temperature. Additionally, the coupled effects of temperature and strain rate were found to alter the damage failure modes, subsequently affecting the separator’s mechanical properties and structural integrity. At low strain rates, the failure of the separator is primarily characterized by plastic deformation and local buckling, whereas complex dynamic failure modes may occur at high strain rates. Based on experimental data, a nonlinear viscoelastic constitutive model was developed, incorporating the effects of temperature-strain rate coupling. This model offers essential insights for the safe and optimized design of lithium-ion batteries. The comprehensive experimental analysis and model developed in this study provide critical references for advancing the design, manufacturing, and practical application of LIB separators, enhancing their reliability and safety across a diverse range of operational conditions.
- lithium-ion battery,
- separator,
- strain rate-temperature coupling,
- constitutive modeling

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References(35)

References

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