Influence of coupling of overcharge state and short-term cycle on the mechanical integrity behavior of 18650 Li-ion batteries subject to lateral compression

Gao, Zhenhai; Zhang, Xiaoting; Wang, Huiyuan; Li, Nan

doi:10.1016/j.ijhydene.2018.01.150

Cited by 24 publications

(13 citation statements)

References 40 publications

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“…Therefore, except for the cells charged at −25 • C at 0.5 C, the failure critical points of the other cells under compression were all near the peaks of their modulus. This conclusion was consistent with the test results of the cells charged to various states at ordinary temperature [11,15]. The cells charged at 0.5 C always exhibited more complex and variable mechanical response and their failure critical points were always at the first large fluctuating peaks of their moduli.…”

Section: Mechanical Characterization Via Lateral Compressionsupporting

confidence: 89%

“…In our experiments, we also found that the cells after low-temperature charge did not have a thermal runaway phenomenon under compression, and the probability of thermal runaway of the cells charged at 25 • C under compression was rather high. For the safety and unsafety cells after charged at 25 • C, their electrical, force and thermal changes during compression could be found in our previous study [15]. Figure 4 presents the nominal stress-strain and nominal modulus-strain curves of the cells charged at various environmental temperatures and rates.…”

Section: Mechanical Characterization Via Lateral Compressionmentioning

confidence: 84%

“…To obtain mechanical behavior of an 18650 LIB cell, the cylindrical cell body was considered as a whole frame (Figure 2b). A rather simple but useful method was used to convert the loading force-displacement curve obtained by compression into the nominal relationships between stress and strain, and between modulus and strain [11,12,15]. Nominal stress can be expressed as:…”

Section: Mechanical Testingmentioning

confidence: 99%

“…They believed that the SOC of 18650 cells affected their stiffness, but had little effect on their mechanical failure load. Recently, our group has investigated the influence of the charging cut-off voltage on the mechanical integrity behavior of 18650 lithium-ion cells [15]. The result showed that the cells with high charging voltage were prone to fail at small moduli and stresses, and the thermal runaway risk of a cell would be 100% when its voltage exceeded 4.4 V. For the pouch cells, the test results revealed that their SOC dependence could be negligible under indentation loads [16].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Low-Temperature Charge on the Mechanical Integrity Behavior of 18650 Lithium-Ion Battery Cells Subject to Lateral Compression

et al. 2019

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The study on the damage tolerance and failure mechanism of lithium-ion batteries (LIBs) subject to mechanical attack has attracted considerable attention. The electrochemical performance and thermal behavior of LIB were significantly affected by operation temperature and charging rate, but the dependence of these two factors on mechanical response remains unclear. Hence, we investigated how the environmental temperatures and rates in charging process affected the mechanical response characteristics of 18650 LIB cells. The onset of the short circuit in the cells which charged at temperatures above −25 °C occurred around their modulus peak under compression. At −25 °C, there was a strong possibility that a premature short circuit occurred locally in the cells during charging, thus they might show complex and variable mechanical response under compression. The failure moduli and crushing stresses of cells subject to compression tended to decrease as their ambient charging temperatures went down. Besides, 0.5 C-charged cells exhibited higher failure moduli and crushing stresses than the 1 C-charged cells above −20 °C. Morphology analyses of the cell electrode surfaces revealed that mossy lithium deposits became evident at temperatures below −10 °C. Furthermore, their distribution was uniform. Mechanical results also indicated that the short-term cycling at −20 °C and 0.5 C would soften the cell.

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Section: Mechanical Characterization Via Lateral Compressionsupporting

confidence: 89%

Section: Mechanical Characterization Via Lateral Compressionmentioning

confidence: 84%

Section: Mechanical Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Low-Temperature Charge on the Mechanical Integrity Behavior of 18650 Lithium-Ion Battery Cells Subject to Lateral Compression

et al. 2019

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“…Study on mechanical behavior of battery mainly focuses on cylindrical LIBs. Compression, [20][21][22][23][24] indentation, 25,26 bending, 27,28 and penetration 29 experiments have been designed for cylindrical LIBs. At the same time, finite element models (FEMs) have been established to calculate the mechanical behavior and internal short circuit trigger of LIBs under mechanical loadings.…”

Section: Introductionmentioning

confidence: 99%

Dynamic behavior and modeling of prismatic lithium‐ion battery

et al. 2020

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Summary The inevitable vehicle collision has made the safety of lithium‐ion battery (LIB) carried by electric vehicles (EVs) a problem that restricts the further and large‐scale promotion of EVs. Therefore, establishing the numerical mechanics model of LIBs and studying their mechanical integrity are imperative. In this study, we design indentation, compression, and drop‐weight experiments for prismatic LIBs (PLIBs). Mechanical integrity and internal short circuit are analyzed in consideration of state of charge (SOC) and dynamic effects. A homogeneous PLIB model that considers anisotropic property, SOC, and dynamic effects is developed for the first time for application in different loading conditions. After its effectiveness is validated, the affecting parameters (ie, SOC and impact velocity) of the mechanical behaviors during dynamic loadings are investigated using the established model. The results show that strain rate effect and SOC state have impact on the mechanical properties of PLIB. However, the strain rate effect has much larger influence than the SOC state. Results may shed lights on the safety design of PLIBs in a mechanical aspect.

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A dynamic electro‐thermal coupled model for temperature prediction of a prismatic battery considering multiple variables

Xie

Zhang

et al. 2020

Int J Energy Res

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Summary A dynamic coupled electro‐thermal model including the impact of the state of charge (SOC), inner temperature and current flux on resistance and heat generation rate is proposed for prismatic batteries, including the ohmic and polarization resistances and entropy coefficient. This model reflects the interaction between generation rate of heat and temperature distribution and is appropriate to be employed. Subsequently, the dynamic model is implemented to reveal the temperature increase of a Li‐ion prismatic battery with the capacity of 50‐Ah under the conditions of static and dynamic currents. Experiments are performed to demonstrate the model which is given in this article can precisely describe the thermal behavior under the conditions of static and dynamic currents and different ambient temperatures, with an average relative error of 5.87% for the static condition and of 11.81% for the dynamic condition. In addition, comparative studies are utilized to decide the application range of the dynamic model. It shows according to the results that it should be used for the temperature prediction under the condition of dynamic current. As for the static current condition, the static model ignoring the effect of current can replace the dynamic model, although the temperature prediction precision of the dynamic model is slightly higher than that of the static model. Finally, the proposed dynamic model is compared with a resistance‐based thermal model where the heat generation depends only on SOC and is demonstrated to be superior to its counterpart.

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Influence of coupling of overcharge state and short-term cycle on the mechanical integrity behavior of 18650 Li-ion batteries subject to lateral compression

Cited by 24 publications

References 40 publications

Influence of Low-Temperature Charge on the Mechanical Integrity Behavior of 18650 Lithium-Ion Battery Cells Subject to Lateral Compression

Influence of Low-Temperature Charge on the Mechanical Integrity Behavior of 18650 Lithium-Ion Battery Cells Subject to Lateral Compression

Dynamic behavior and modeling of prismatic lithium‐ion battery

A dynamic electro‐thermal coupled model for temperature prediction of a prismatic battery considering multiple variables

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