Dynamic mechanical behavior of lithium-ion pouch cells subjected to high-velocity impact

Chen, Yanyu; Santhanagopalan, Shriram; Babu, Venkatesh; Ding, Yi

doi:10.1016/j.compstruct.2019.03.046

Cited by 54 publications

(18 citation statements)

References 44 publications

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“…This is consistent with Gilaki's observation of higher peak loads in dry jellyroll stacks [35]. Dixon confirmed that dry cells experience comparatively higher peak loads under indentation and explained that this is due to the softening effect of the liquid electrolyte on cell layers in wet cells, a finding that was latterly supported by Chen [47,48]. Furthermore, Jia observed that the hardening effect of strain rate dependence has a greater influence on the magnitude of compression stress than the dependence of compression stiffness on the state of charge, which is known to arise from volumetric changes in graphite and silicone anodes due to the intercalation of lithium ions [49].…”

Section: Introductionsupporting

confidence: 86%

“…This is particularly notable for falling mass test devices that can achieve high impact energies but unlike universal test frames are typically unable to actively maintain a constant strain rate due to deceleration of the indenter [60,61]. Due to their general availability and ubiquity, drop towers have been used in a number of studies concerning the dynamic mechanical properties of lithium-ion cells [34,48,49,62]. This investigation considered adaptations to falling mass impact methodologies with the aim of improving the precision with which dynamic mechanical properties of lithium-ion cells can be determined from drop tower experiments.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Mechanical Compression Impulse of Lithium-Ion Pouch Cells

2020

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Strain rate sensitivity has been widely recognized as a significant feature of the dynamic mechanical properties of lithium-ion cells, which are important for their accurate representation in automotive crash simulations. This research sought to improve the precision with which dynamic mechanical properties can be determined from drop tower impact testing through the use of a diaphragm to minimize transient shock loads and to constrain off-axis motion of the indenter, specialized impact absorbers to reduce noise, and observation of displacement with a high speed camera. Inert pouch cells showed strain rate sensitivity in an increased stiffness during impact tests that was consistent with the poromechanical interaction of the porous structure of the jellyroll with the liquid electrolyte. The impact behaviour of the inert pouch cells was similar to that of an Expanded Polypropylene foam (EPP), with the exception that the inert pouch cells did not show hysteretic recovery under the weight of the indenter. This suggests that the dynamic mechanical behaviour of the inert pouch cells is analogous to a highly damped foam.

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Section: Introductionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Compression Impulse of Lithium-Ion Pouch Cells

2020

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“…When setting failure criteria, the effect of different loading speeds should be considered. Chen et al researched the experimental and computational studies on the dynamic response of LIBs under high‐velocity (200 to approximately 1000 m/s) impact. Xu et al systematically studied the mechanical response of batteries under dynamic loads.…”

Section: Introductionmentioning

confidence: 99%

Dynamic mechanical behavior of prismatic lithium‐ion battery upon impact

et al. 2019

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Summary Dynamic impact safety of lithium‐ion batteries (LIBs) is a hot subject. The mechanical‐electrical behavior of LIBs under dynamic loading was studied in this study. Drop‐weight tests of two types of indenter, namely, round and flat heads, were conducted. Strain rate and state of charge (SOC) effects on the mechanical properties of LIBs under different indenters were fully discussed. The interaction between mechanical performance and electrical behavior was studied. Experiments show that the structural stiffness of batteries increases with strain rate increase but exhibits little effect from SOC. Different indenters have a significant influence on the mechanical behavior of the prismatic LIBs. Under the same impact rate and SOC, the peak load of a flat head is considerably larger than that of a round head. The battery exhibits a hard short‐circuit under the impact of a round head and a soft short‐circuit under the impact of a flat head. This result shows that the larger the contact area between the indenter and the battery is, the larger the impact load under the same drop‐weight and impact rate will be, although the impact safety of the battery does not decrease. The results provide useful insights into the basic understanding of the electromechanical coupling integrity of LIBs.

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“…The effect of projectile deflection β on residual velocity has also been studied by Chen et al [36], which concerned the high-speed impact performance of a lithium-ion battery using a homogenized anisotropic model and identified the presence of a critical deflection angle for a maximum residual velocity V r . Comparing Figure 11a and b, for the small deflection angle range, the damage induced by the impact with β is more serious than that with α .…”

Section: Resultsmentioning

confidence: 99%

Finite Element Study on the Impact Resistance of Laminated and Textile Composites

Xing

et al. 2019

Polymers

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The impact resistance of fiber-reinforced polymer composites is a critical concern for structure design in aerospace applications. In this work, experiments were conducted to evaluate the impact performance of four types of composite panels, using a gas-gun test system. Computational efficient finite element models were developed to model the high-speed ballistic impact behavior of laminate and textile composites. The models were first validated by comparing the critical impact threshold and the failure patterns against experimental results. The damage progression and energy evolution behavior were combined to analyze the impact failure process of the composite panels. Numerical parametric studies were designed to investigate the sensitivity of impact resistance against impact attitude, including impact deflection angles and projectile deflection angles, which provide a comprehensive understanding of the damage tolerance of the composite panels. The numerical results elaborate the different impact resistances for laminate and textile composites and their different sensitivities to deflection angles.

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Dynamic mechanical behavior of lithium-ion pouch cells subjected to high-velocity impact

Cited by 54 publications

References 44 publications

Dynamic Mechanical Compression Impulse of Lithium-Ion Pouch Cells

Dynamic Mechanical Compression Impulse of Lithium-Ion Pouch Cells

Dynamic mechanical behavior of prismatic lithium‐ion battery upon impact

Finite Element Study on the Impact Resistance of Laminated and Textile Composites

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