The indentation analysis triggering internal short circuit of lithium-ion pouch battery based on shape function theory

Hao, Wenqian; Xie, Jiamiao; Wang, Fenghui

doi:10.1002/er.4109

Cited by 25 publications

(27 citation statements)

References 40 publications

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“…The model can simulate the thermal field distribution under mechanical deformation and more comprehensively reflect the failure process of batteries. Hao et al studied the influence of different indenter sizes on the mechanical behaviors of batteries by combining theory with experiment. Xu et al tested batteries with different SOC and found that SOC had a significant effect on the mechanical properties of batteries.…”

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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Section: Introductionmentioning

confidence: 99%

Dynamic mechanical behavior of prismatic lithium‐ion battery upon impact

et al. 2019

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“…The lithium dendrites may puncture the separator, which can trigger ISC or even explosion of the battery. According to previous researches, 19,25,[29][30][31][32] the exterior force increased gradually and then decreased with the increasing of indentation displacement, and ISC occurred together with mechanical failure, voltage dropping, and temperature rising. The above drastic changes meant that the failure of separators produced and direct contact occurred between positive and negative electrodes, which ultimately triggered ISC of LIPB under exterior loading ( Figure 1A).…”

Section: Introductionmentioning

confidence: 79%

“…According to the research by Hao et al, the total plastic energy of system is linear superposition of bending moment term and membrane force term. Because deformation shape of LIPB is similar to sinusoidal shape according to Figure C,D, so the sinusoidal shape function is proposed to describe the deformation field . Two independent variables, indentation displacement δ and deformation region λ , are used to analyze the resistance exterior force property of LIPB in this research.…”

Section: Indentation Theoretical Modelmentioning

confidence: 99%

“…In addition, the shape function must satisfy the boundary conditions, ie, when r = R , z = δ and when r = λ , z = 0. The deformation field of top soft casing under a flat cylindrical punch with radius R (Figure C) along z ‐direction is given by

z ((),, r, λ) = ({, \begin{array}{l} δ 0 \leq r \leq R \\ δ ([], 1 - sin \frac{π ((), r - R)}{2 ((), λ - R)}) . R \leq r \leq λ \end{array})

On the basis of total energy balance principle, the resistance exterior force can be derived . The total energy E p of system is

E_{p} = E_{f} + E_{c} - \int_{0}^{δ} italicPdδ,

where E f is plastic strain energy of soft casing and E c is plastic work produced by compressive deformation of jellyroll core.…”

Section: Indentation Theoretical Modelmentioning

confidence: 99%

“…30,48,49 As the application scope of each shape function was limited, different shape functions should be employed to describe mechanical property of LIPB. 30 The purpose of this paper is to investigate resistance exterior force property of LIPBs with different positive materials under exterior loading by putting forth the theoretical expression. From the view of energy absorption of jellyroll core, the range of deformation region that triggers ISC is determined, and the resistance exterior force of LIPBs with different positive materials is compared.…”

Section: Introductionmentioning

confidence: 99%

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Resistance exterior force property of lithium‐ion pouch batteries with different positive materials

Hao

Xie

et al. 2019

Int J Energy Res

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Summary Lithium‐ion pouch battery (LIPB) is widely applied in different engineering fields, such as electric vehicles, aeronautics, astronautics, and among others. However, few complete mechanical models with deformation field are presented to predict internal short circuit (ISC) and resistance exterior force property of LIPB under exterior loading. In the present research, the indentation theoretical models with sinusoidal shape function are established to investigate resistance exterior force property of batteries with different positive materials under different punch shapes loading. The effects of indentation displacement and deformation region on indentation force are carried out. By the comparison of indentation force, present theoretical and numerical results are consistent with previous experimental results. The indentation force increases with the punch radius increase, but decreases with the indentation displacement increase. On the basis of energy conservation law, it is concluded that LIPB is more likely to produce mechanical failure and ISC when normalized deformation region is greater than or equal to 0.4 and plastic strain energy ratio is greater than or equal to 1.5. In addition, from resistance exterior force property point of view, LIPB has a better property to resist external force when LiMnNiCoO2, rather than LiCoO2 and Nanophosphate, is used as positive material. The research provides a reference for assessing the safety of LIPB and selecting suitable positive material, which possesses high energy capacity and resistance exterior force property.

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A fast‐validated computational model for cylindrical lithium‐ion batteries under multidirectional mechanical loading

Xia

Tang

2020

Int J Energy Res

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Summary In the current electric vehicle (EV) market, cylindrical lithium‐ion batteries (LIBs) have played an indispensable role due to their high capacity and stability. However, LIBs are generally recognized as fragile and may cause fires or explosions when broken. Upon this issue, most studies focus on revealing the detailed reaction and interior change in the LIB during using or abuse conditions. However, in this study, we would like to provide a highly accessible model for automotive cylindrical LIBs that is practical in engineering application and can reduce computational effort in the entire EV crash simulation. In order to achieve this goal, the LIB model is built and meshed as a whole and a specific anisotropic material model is set so as the model can apply to multidirectional mechanical loading. Considering various operating condition of LIBs, state of charge (SOC) dependence and dynamic effect is termed as factors worth noticing when establishing this model. Furthermore, to predict the electrochemical responses and failures of LIBs, two optional short‐circuit criteria are defined. The proposed modeling method provides a powerful tool for analyzing the safety of batteries and battery packs with less computational and analytic effort than previous approaches.

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The indentation analysis triggering internal short circuit of lithium-ion pouch battery based on shape function theory

Cited by 25 publications

References 40 publications

Dynamic mechanical behavior of prismatic lithium‐ion battery upon impact

Dynamic mechanical behavior of prismatic lithium‐ion battery upon impact

Resistance exterior force property of lithium‐ion pouch batteries with different positive materials

A fast‐validated computational model for cylindrical lithium‐ion batteries under multidirectional mechanical loading

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