Modeling the anisotropic behavior of highly orthotropic lithium-ion batteries polymer separators

Makki, Mustapha; Ayoub, Georges; Lee, Cheol W.

doi:10.1016/j.ijsolstr.2022.112102

Cited by 5 publications

(2 citation statements)

References 85 publications

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“…Equation ( 22) only considers elastic deformation and does not consider any plastic deformation. This is a safe assumption since the amount of deformation in this study is very small and does not exceed the elastic limit [8,14,[33][34][35]. It should be also noted that the strain induced by intercalation, denoted by ε D ij is exclusively applicable to the positive and negative electrodes.…”

Section: Battery Cellmentioning

confidence: 85%

Stress Distribution Inside a Lithium-Ion Battery Cell during Fast Charging and Its Effect on Degradation of Separator

Makki,

Lee,

Ayoub

2023

Batteries

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The automotive industry is rapidly transitioning to electric vehicles (EVs) in response to the global efforts to reduce greenhouse gas emissions. Lithium-ion battery (LIB) has emerged as the main tool for energy storage in electric vehicles. A widespread adoption of EVs, however, requires a fast-charging technology that can significantly reduce charging time while avoiding any unsafe conditions including short circuits due to failure of the separator in an LIB cell. Therefore, it is necessary to understand the mechanical stresses during fast charging and their long-term effect on the integrity of the separator. This paper presents a novel hybrid model for the prediction of the stress distribution in the separator of a pouch cell under various charging speeds, ambient temperatures, and pack assembly conditions, such as compressive pressures. The proposed hybrid model consists of three sub-models, namely, an electrochemical cell model, a lumped-parameter model, and a solid mechanics model. A robust parameter identification scheme is implemented to determine the model parameters using the experimental data. The separator within the test setup will experience maximum von Mises stress of 74 MPa during 4C charging, i.e., when the charge current in A is four times as high as the capacity of the battery cell in Ah. To assess the evolution of the damage in the separator under the estimated stress during fast charging, creep and fatigue tests are conducted on the separator. Their results indicate a progressive accumulation of damage in the separator, further emphasizing the importance of understanding and mitigating mechanical degradation in separator materials.

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Section: Battery Cellmentioning

confidence: 85%

Stress Distribution Inside a Lithium-Ion Battery Cell during Fast Charging and Its Effect on Degradation of Separator

Makki,

Lee,

Ayoub

2023

Batteries

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“…Furthermore, a representative volumetric element modeling method was proposed by Xie et al [22] to predict the tensile properties of PP separators. Recently, an elastic-hyperelastic-viscoplastic model was developed by Makki et al [23] for predicting the mechanical response of battery separators under large deformations. The model considered the rate dependence in the plastic range through a damage rate sensitivity parameter.…”

Section: Introductionmentioning

confidence: 99%

A Coupled Nonlinear Viscoelastic–Viscoplastic Thermomechanical Model for Polymeric Lithium-Ion Battery Separators

Ihuaenyi,

Deng,

Bae

et al. 2023

Batteries

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One of the major concerns in ensuring lithium-ion battery (LIB) safety in abuse scenarios is the structural integrity of the battery separator. This paper presents a coupled viscoelastic–viscoplastic model for predicting the thermomechanical response of polymeric battery separators in abuse scenarios under combined mechanical and thermal loadings. The viscoplastic model is developed based on a rheological framework that considers the mechanisms involved in the initial yielding, change in viscosity, strain softening and strain hardening of polymeric separators. The viscoplastic model is then coupled with a previously developed orthotropic nonlinear thermoviscoelastic model to predict the thermomechanical response of polymeric separators before the onset of failure. The model parameters are determined for Celgard®2400, a polypropylene (PP) separator, and the model is implemented in the LS-DYNA® finite element (FE) package as a user-defined subroutine. Punch test simulations are employed to verify the model predictions under biaxial stress states. Simulations of uniaxial tensile stress–strain responses at different strain rates and temperatures are compared with experimental data to validate the model predictions. The model predictions of the material anisotropy, rate and temperature dependence agree well with experimental observations.

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On the strain rate-dependent mechanical behavior of PE separator for lithium-ion batteries

Li,

Gu,

Pan

et al. 2024

International Journal of Impact Engineering

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Modeling the anisotropic behavior of highly orthotropic lithium-ion batteries polymer separators

Cited by 5 publications

References 85 publications

Stress Distribution Inside a Lithium-Ion Battery Cell during Fast Charging and Its Effect on Degradation of Separator

Stress Distribution Inside a Lithium-Ion Battery Cell during Fast Charging and Its Effect on Degradation of Separator

A Coupled Nonlinear Viscoelastic–Viscoplastic Thermomechanical Model for Polymeric Lithium-Ion Battery Separators

On the strain rate-dependent mechanical behavior of PE separator for lithium-ion batteries

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