scholarly journals Impact of Charging and Charging Rate on Thermal Runaway Behaviors of Lithium-Ion Cells

2021 ◽  
Author(s):  
Dongxu Ouyang ◽  
Jingwen Weng ◽  
Mingyi Chen ◽  
Jian Wang
Keyword(s):  
Lithium Ion ◽  
Thermal Runaway ◽  
Lithium Ion Cells ◽  
Charging Rate ◽  
Internal Morphology ◽  
Cell Stability ◽  
Initial States ◽  
Micro Features ◽  
The Impact ◽  
Runaway Process

Abstract The present work carries out a series of thermal runaway experiments to explore the impact of charging and charging rate on the thermal runaway behaviors of lithium-ion cells, in which five charging rates (0C, 0.5C, 1C, 2C and 4C) and three initial states of charge (SOC), i.e. 25%, 50% and 75% are included. The thermal runaway process of 18650 lithium-ion cells induced by over-heating usually consists of seven stages, and is accompanied with high-temperature, fire and toxicity risks. The internal morphology of cells and the micro features of cell materials are seriously damaged after thermal runaway. Charging aggravates the thermal runaway behavior of cells, which is further exhibited as the earlier occurrence of safety vent opening, gas releasing and thermal runaway. Moreover, the severity deteriorates as the charging rate increases (the larger the charging rate, the earlier and more severe the thermal runway), which may be ascribed to the growth of cell SOC and the decline of cell stability under charging. This phenomenon is especially apparent for the cell with a high initial SOC where a more dramatic-rising α (the advancement ratio of critical times for thermal runaway due to charging) is observed.

Internal temperature detection of thermal runaway in lithium-ion cells tested by extended-volume accelerating rate calorimetry

2020 ◽  
Vol 31 ◽  
pp. 101670 ◽  
Author(s):  
Chengshan Xu ◽  
Xuning Feng ◽  
Wensheng Huang ◽  
Yongkang Duan ◽  
Tianyu Chen ◽  
...  
Keyword(s):  
Lithium Ion ◽  
Thermal Runaway ◽  
Internal Temperature ◽  
Lithium Ion Cells ◽  
Temperature Detection

scholarly journals Degradation Reactions in SONY-Type Li-Ion Batteries

1999 ◽  
Vol 575 ◽  
Author(s):  
E. Peter Roth ◽  
G. Nagasubramanian
Keyword(s):  
Lithium Ion ◽  
Thermal Runaway ◽  
The State ◽  
State Of Charge ◽  
Reaction Products ◽  
Exothermic Reactions ◽  
Degradation Reactions ◽  
Lithium Ion Cells ◽  
Reaction Region ◽  
Charge Degree

ABSTRACTThermal instabilities were identified in SONY-type lithium-ion cells and correlated with interactions of cell constituents and reaction products. Three temperature regions of interaction were identified and associated with the state of charge (degree of Li intercalation) of the cell. Anodes were shown to undergo exothermic reactions as low as 100°C involving the solid electrolyte interface (SEI) layer and the LiPF6 salt in the electrolyte (EC:PC:DEC/LiPF6). These reactions could account for the thermal runaway observed in these cells beginning at 100°C. Exothermic reactions were also observed in the 200°C-300°C region between the intercalated lithium anodes, the LiPF6 salt, and the PVDF. These reactions were followed by a hightemperature reaction region, 300°C-400°C, also involving the PVDF binder and the intercalated lithium anodes. The solvent was not directly involved in these reactions but served as a moderator and transport medium. Cathode exothermic reactions with the PVDF binder were observed above 200°C and increased with the state of charge (decreasing Li content). This offers an explanation for the observed lower thermal runaway temperatures for charged cells.

scholarly journals Analysis of the impact of quick charge technology on the charging process parameters of the lithium-ion storage at various temperatures

2018 ◽  
Vol 19 ◽  
pp. 01035 ◽  
Author(s):  
Damian Burzyński ◽  
Damian Głuchy ◽  
Maksymilian Godek
Keyword(s):  
Process Parameters ◽  
Lithium Ion ◽  
Cell Parameters ◽  
Lithium Ion Cells ◽  
Lithium Ion Cell ◽  
Ion Storage ◽  
Different Temperatures ◽  
The Subject ◽  
The Impact

The paper deals with the subject of influence of the Quick Charge technology on the parameters of the charging process of lithium-ion cells. Tests of lithium-ion cell parameters during the charging process were performed at three different temperatures using conventional and accelerated charging. Also, the following paper comprises conclusions related to the conducted tests.

Investigation on Thermal Runaway of Li-Ion Cells Based on LiNi1/3Mn1/3Co1/3O2

2020 ◽  
Vol 18 (3) ◽  
Author(s):  
Xiaoyi Xie ◽  
Dongsheng Ren ◽  
Li Wang ◽  
Xuning Feng ◽  
Xiangming He
Keyword(s):  
Electric Vehicles ◽  
Safety Management ◽  
Lithium Ion ◽  
Thermal Runaway ◽  
Onset Temperature ◽  
Ex Situ ◽  
X Ray Diffraction ◽  
Self Heating ◽  
Lithium Ion Cells ◽  
Endothermic Reactions

Abstract The thermal runaway behavior of lithium-ion cells plays a crucial role in the safety management of the powertrain in electric vehicles. In this study, the effect of states of charge (SOC) on the thermal runaway behavior of commercial LiNi1/3Mn1/3Co1/3O2 (NMC)-based pouch cells is investigated using accelerating rate calorimetry (ARC) and ex-situ X-ray diffraction. By studying the differences in the onset temperature of self-heating (T1) and the onset temperature of thermal runaway (T2) along with the mass loss between the different SOCs, we observed that higher SOC led to a decrease in the T2. However, T1 initially increased and then decreased with increasing SOC. These trends were attributed to the phase change of cathode material and separator. The ARC results also indicated the occurrence of endothermic reactions during the self-heating accumulation period. The findings in this study are helpful for thermal safety management of battery powertrain for electric vehicles.

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