Safety assessment of electrically cycled cells at high temperatures under mechanical crush loads

Kovachev, Georgi; Ellersdorfer, Christian; Gstrein, Gregor; Hanzu, Ilie; Wilkening, Martin; Werling, Tobias; Schauwecker, Florian; Sinz, Wolfgang

doi:10.1016/j.etran.2020.100087

Cited by 38 publications

(31 citation statements)

References 25 publications

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“…All these developments have led to remarkable improvements in battery energy density. [3][4][5][6][7] For example, the reversible energy of LIBs exceeded 300 W h kg À1 when Ni-rich (LiNi x Mn y Co 1ÀxÀy O 2 , such as LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811)) cathodes and Si-containing anodes were employed. [8][9][10] However, the higher the energy density is, the more severe the capacity fading and thermal runaway.…”

Section: Introductionmentioning

confidence: 99%

The significance of mitigating crosstalk in lithium-ion batteries: a review

Song

Wang

Sheng

et al. 2023

Energy Environ. Sci.

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Section: Introductionmentioning

confidence: 99%

The significance of mitigating crosstalk in lithium-ion batteries: a review

Song

Wang

Sheng

et al. 2023

Energy Environ. Sci.

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“…Another interesting aspect for vibration behavior assessment is the change of mechanical properties of electrical and thermal aging. Not only the volume of a Lithium-Ion battery changes over temperature, state of charge and cycles but also key figures in the elastic and plastic behavior change, as described in [13]. Although this aspect is not covered in the very general holistic view on battery loads in this contribution, it is thought to be a very interesting field for further research also for vibration & shock environments.…”

Section: State Of the Artmentioning

confidence: 98%

Towards Realistic Vibration Testing of Large Floor Batteries for Battery Electric Vehicles (BEV)

Plaumann¹

2022

Sound&Vibration

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This contribution shows an analysis of vibration measurement on large floor-mounted traction batteries of Battery Electric Vehicles (BEV). The focus lies on the requirements for a realistic replication of the mechanical environments in a testing laboratory. Especially the analysis on global bending transfer functions and local corner bending coherence indicate that neither a fully stiff fixation of the battery nor a completely independent movement on the four corners yields a realistic and conservative test scenario. The contribution will further show what implication these findings have on future vibration & shock testing equipment for large traction batteries. Additionally, it will cover an outlook on how vibration behavior of highly integrated approaches (cell2car) changes the mechanical loads on the cells.

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“…Degradation of the thermal conductivity over the whole SOC-range of aged cells was also seen, which can be correlated to the observed capacity degradation and to the underlying degradation mechanisms. The overall reduction of TC for each measured state of charge can be related to several different effects, the first of which is the consumption of active lithium for the growth of the SEI layer on the negative electrode [19]. The solid electrolyte interphase is formed on the anode surface due to chemical reactions between decomposition products of the electrolyte solvent and lithium salt [20], which in general affects the long-term cell performance.…”

Section: Influence Of Cycle Life On Thermal Conductivitymentioning

confidence: 99%

Thermal Conductivity in Aged Li-Ion Cells under Various Compression Conditions and State-of-Charge

et al. 2021

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Thermal conductivity (TC) is a parameter, which significantly influences the spatial temperature gradients of lithium ion batteries in operative or abuse conditions. It affects the dissipation of the generated heat by the cell during normal operation or during thermal runaway propagation from one cell to the next after an external short circuit. Hence, the thermal conductivity is a parameter of great importance, which concurs to assess the safety of a Li-ion battery. In this work, an already validated, non-destructive measurement procedure was adopted for the determination of the evolution of the through-plane thermal conductivity of 41 Ah commercially available Li-ion pouch cells (LiNiMnCoO2-LiMn2O4/Graphite) as function of battery lifetime and state of charge (SOC). Results show a negative parabolic behaviour of the thermal conductivity over the battery SOC-range. In addition, an average decrease of TC in thickness direction of around 4% and 23% was measured for cells cycled at 60 °C with and without compression, respectively. It was shown that pretension force during cycling reduces battery degradation and thus minimises the effect of ageing on the thermal parameter deterioration. Nevertheless, this study highlights the need of adjustment of the battery pack cooling system due to the deterioration of thermal conductivity after certain battery lifetime with the aim of reducing the risk of battery overheating after certain product life.

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Safety assessment of electrically cycled cells at high temperatures under mechanical crush loads

Cited by 38 publications

References 25 publications

The significance of mitigating crosstalk in lithium-ion batteries: a review

The significance of mitigating crosstalk in lithium-ion batteries: a review

Towards Realistic Vibration Testing of Large Floor Batteries for Battery Electric Vehicles (BEV)

Thermal Conductivity in Aged Li-Ion Cells under Various Compression Conditions and State-of-Charge

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