Experimental study on thermal runaway behaviors of 18650 li-ion battery under enclosed and ventilated conditions

Zhao, Junchao; Lu, Song; Fu, Yangyang; Ma, Weitong; Cheng, Yuan; Zhang, Heping

doi:10.1016/j.firesaf.2021.103417

Cited by 19 publications

(2 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Aiming at the safety of electric vehicle power batteries, scholars at home and abroad have researched their combustion mechanism, safety protection, and simulation prediction. Zhao [9] and Kong et al [10] conducted thermal runaway tests on 18,650 lithium-ion batteries under closed, ventilated, and low-temperature conditions. It was found that both the rupture and deformation of the battery casing under different conditions are the key factors for its combustion.…”

Section: Introductionmentioning

confidence: 99%

Optimization Study of Fire Prevention Structure of Electric Vehicle Based on Bottom Crash Protection

Chen,

Xiong,

et al. 2024

Fire

View full text Add to dashboard Cite

As the market share of electric vehicles continues to expand, fire accidents due to impacts from the power battery located at the bottom of the electric vehicles are receiving increasing attention. Lithium-ion batteries, as the mainstream choice of power battery for electric vehicles solving the problem that they are prone to thermal runaway due to damage when impacted, are the key to preventing and controlling fire accidents in electric vehicles. To address the protective problem of the bottom power battery of electric vehicles when it is impacted by road debris, two new types of sandwich structures with an enhanced regular hexagonal structure and semicircular arch structure as the core layer, respectively, are innovatively proposed in this article. They are used to protect the bottom power battery of electric vehicles and are compared with the traditional homogeneous protective structure in terms of protective performance. A local finite element simulation (FEM) of an electric vehicle containing the necessary components was established for simulation. Stress distribution, deformation, and energy absorption data for each component of an electric vehicle assembled with a protective structure when subjected to a bottom impact were obtained safely and cost-effectively. Three evaluation coefficients, namely, the cell shape variable (Bcmax), the protective effect parameter (ƒPE), and the total energy absorption of the structure (Ea), are proposed to compare and analyze the simulation results of different protective structures under equal mass conditions. The maximum values of the battery deformation of arched sandwich construction and reinforced honeycomb sandwich construction were 0.35 mm and 0.40 mm, respectively, which are much smaller than that of the maximum deformation of the battery under the protection of a homogeneous protective structure, which is 0.62 mm. Their protective effect parameters are 43.55 and 35.48, respectively, which proves that the optimization degree of the protective structure of the bottom of the electric vehicle after the application of the new structure is 35% or more. The total energy absorptions of the two structures are 91.77 J and 87.19 J, respectively, accounting for more than 70% of the kinetic energy in the system, which proves that the deformation of the sandwich structure can effectively absorb the kinetic energy of the collision between the road obstacle and the bottom of the car. The final results show that the arched sandwich structure showed the best impact resistance in the simulation, which can be used for the power battery’s protective structure on the electric vehicle’s bottom. This study fills a gap in local finite element modeling in electric vehicle crash simulations and provides ideas for fire prevention designs of electric vehicle structures.

show abstract

Section: Introductionmentioning

confidence: 99%

Optimization Study of Fire Prevention Structure of Electric Vehicle Based on Bottom Crash Protection

Chen,

Xiong,

et al. 2024

Fire

View full text Add to dashboard Cite

show abstract

“…The results revealed that the flexural modulus and stiffness of the battery increased with SOC, and failure mechanisms such as delamination, interlayer slippage, and electrode cracking were observed. Zhao et al [23] employed novel experimental equipment to assess the influence of environmental conditions on TR behavior in single-battery LIB modules, considering both enclosed and ventilated conditions. The results highlighted that external pressure played a crucial role in case rupture, with a greater risk of gas explosion observed in enclosed conditions compared to ventilated conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Thermal Runaway Propagation Characteristics and Thermal Failure Prediction Parameters of Six-Cell Lithium-Ion Battery Modules

Gao

Wang

2023

Energies

View full text Add to dashboard Cite

Efforts to meet regulations ensuring the safety of lithium-ion battery (LIB) modules in electric vehicles are currently limited in their ability to provide sufficient safe escape times in the event of thermal runaway (TR). Thermal runaway occurs when the heat generation of a battery module exceeds its heat removal capacity, leading to a rapid increase in temperature and uncontrolled heat release. To address this issue, this study focuses on evaluating the cascading thermal failure characteristics of six-cell LIB modules under an air environment in an experimental combustion chamber. Sensors are strategically placed at advantageous locations to capture changes in various characteristic parameters, including LIB temperature, module voltage, module mass, and the concentrations of venting gases in the combustion chamber. Analysis of the variations in these characteristic parameters over time aims to identify effective signals that can predict thermal failure conditions with a maximum warning time. The results demonstrate that monitoring LIB temperature provides the shortest advance warning of TR propagation within the module. However, module voltage measurements offer a warning that is approximately 2% earlier on average. On the other hand, measurements of the module mass and concentrations of venting gases in the combustion chamber allow for warnings of thermal failure that are, on average, approximately 2 min earlier than those based solely on LIB temperature. These findings can serve as guidance for improving the safety of LIBs, enhancing the reliability of fault detection systems, and exceeding the safe escape time requirements set by current global regulations.

show abstract

The experimental investigation of thermal runaway characteristics of lithium battery under different nitrogen concentrations

Tao,

Zhu,

Liu

et al. 2023

J Therm Anal Calorim

View full text Add to dashboard Cite

Experimental study on thermal runaway behaviors of 18650 li-ion battery under enclosed and ventilated conditions

Cited by 19 publications

References 41 publications

Optimization Study of Fire Prevention Structure of Electric Vehicle Based on Bottom Crash Protection

Optimization Study of Fire Prevention Structure of Electric Vehicle Based on Bottom Crash Protection

Experimental Investigation of the Thermal Runaway Propagation Characteristics and Thermal Failure Prediction Parameters of Six-Cell Lithium-Ion Battery Modules

The experimental investigation of thermal runaway characteristics of lithium battery under different nitrogen concentrations

Contact Info

Product

Resources

About