Effects of electrolyte, thickness, and casing stiffness on the dynamic response of lithium-ion battery cells

Kisters, Thomas; Keshavarzi, Mohammad Mehdi; Kuder, Jürgen; Sahraei, Elham

doi:10.1016/j.egyr.2021.09.107

Cited by 17 publications

(3 citation statements)

References 33 publications

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“…Researchers have conducted extensive experiments, theoretical studies, and simulations in response to this issue. In terms of mechanical abuse experiments, researchers have explored experiments under quasi-static squeezing 15 , 16 , dynamic loads 17 , 18 , different shapes of punch 19 , 20 , different battery types 21 – 23 , and different battery SOC 17 . These experiments aim to capture changes in parameters such as voltage, force, and temperature during the battery's failure process.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis and safety assessment of thermal runaway behavior in lithium iron phosphate batteries under mechanical abuse

Chai,

Li,

Liu

et al. 2024

Sci Rep

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Mechanical abuse can lead to internal short circuits and thermal runaway in lithium-ion batteries, causing severe harm. Therefore, this paper systematically investigates the thermal runaway behavior and safety assessment of lithium iron phosphate (LFP) batteries under mechanical abuse through experimental research. Mechanical abuse experiments are conducted under different conditions and battery state of charge (SOC), capturing force, voltage, and temperature responses during failure. Subsequently, characteristic parameters of thermal runaway behavior are extracted. Further, mechanical abuse conditions are quantified, and the relationship between experimental conditions and battery characteristic parameters is analyzed. Finally, regression models for battery safety boundaries and the degree of thermal runaway risk are established. The research results indicate that the extracted characteristic parameters effectively reflect internal short circuit (ISC) and thermal runaway behaviors, and the regression models provide a robust description of the battery's safety boundaries and thermal runaway risk degree. This work sheds light on understanding thermal runaway behavior and safety assessment methods for lithium-ion cells under mechanical abuse.

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Section: Introductionmentioning

confidence: 99%

Experimental analysis and safety assessment of thermal runaway behavior in lithium iron phosphate batteries under mechanical abuse

Chai,

Li,

Liu

et al. 2024

Sci Rep

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“…Prismatic and elliptical cells, unlike pouch batteries, have a hard casing which makes the characterization of jellyroll material less convenient unless the battery is disassembled 27 . However, because the middle part of the cross‐section of the jellyroll is flat, several techniques can be implemented to calibrate and validate material models of the jellyroll through flat compression or hemispherical punch tests on the central, flat part of the jellyroll 28‐30 . For cylindrical cells, because of the spiral shape of the components, homogenization and finding average constitutive properties can be challenging.…”

Section: Introductionmentioning

confidence: 99%

“…27 However, because the middle part of the cross-section of the jellyroll is flat, several techniques can be implemented to calibrate and validate material models of the jellyroll through flat compression or hemispherical punch tests on the central, flat part of the jellyroll. [28][29][30] For cylindrical cells, because of the spiral shape of the components, homogenization and finding average constitutive properties can be challenging. In the past several years, many studies have been published on the characterization of these batteries focusing on jellyroll homogenization.…”

Section: Introductionmentioning

confidence: 99%

Homogenized characterization of cylindrical Li‐ion battery cells using elliptical approximation

Gilaki

Song

Sahraei

2021

Intl J of Energy Research

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Summary Homogenization and finding the constitutive model of jellyroll in cylindrical lithium‐ion batteries can be challenging because of their form factor. Taking samples out of the original jellyroll wounding or compressing cell assembly in its cylindrical coordinates are two possibilities for measuring the homogenized lateral strength of the cell. However, the former causes loss of accuracy due to changing constraints and electrolyte environment, and the latter requires complex fixtures that are not readily available or even practical to manufacture. Various approaches have been suggested by researchers to circumvent the above difficulties and allow the extraction of hardening curves. However, the precision of those approaches diminishes when the cells are under global compression vs local punch deformations. In this study, an updated homogenization method is established, using a lateral compression test on the jellyroll. The homogenization method is based on the assumption that the circular cross‐section of the jellyroll under compression is deformed in an elliptical shape. Then the principle of virtual work is used to extract the hardening curve. To validate the above characterization model, isotropic and anisotropic finite element models were developed using crushable foam and modified honeycomb material models from the LS‐DYNA library. Four sets of cell‐level experiments were performed on cylindrical batteries using custom‐designed fixtures, including flat lateral compression, rod indentation, hemispherical punch, and three‐point bending. The voltage and surface temperature of the batteries were measured to capture the onset of short circuit during the tests. Comparison of the simulation results confirmed that the proposed homogenization method and the FE models can predict the behavior of cylindrical lithium‐ion batteries with much higher accuracy compared to the currently available methods presented in the literature.

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Effects of electrolyte, thickness, and casing stiffness on the dynamic response of lithium-ion battery cells

Cited by 17 publications

References 33 publications

Experimental analysis and safety assessment of thermal runaway behavior in lithium iron phosphate batteries under mechanical abuse

Experimental analysis and safety assessment of thermal runaway behavior in lithium iron phosphate batteries under mechanical abuse

Homogenized characterization of cylindrical Li‐ion battery cells using elliptical approximation

Modeling state-of-charge dependent mechanical response of lithium-ion batteries with volume expansion

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