Abstract
The frequent accidents of power lithium-ion battery have become the major reason to hinder the development of electric vehicles. In this paper, the thermal runaway process for a 32650 battery is analyzed based on 300°C oven heating experiment in adiabatic rate calorimeter, the rise of temperature, the drop of voltage and the leakage of electrolyte are observed before exploding, which could be used as predictor variables for thermal runaway warning. A large number of smoke releases and diffuses after explosion, which could be utilized as a criterion for determining the explosion. And a lumped chemical reaction kinetics model coupled with three-dimensional heat transfer model is constructed for further discussion. The thermal runaway process of the battery could be accurately calculated by the coupled model. Thermal radiation plays a more important role in heat transfer than heat convection in the process of thermal runaway. The explosion happens when the temperature achieves around 230°C, and the active material mainly starts to decompose at this moment.
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Abbreviations
- A x :
-
Reaction frequency factor (s−1)
- Cp bat :
-
Heat capacity of the battery (J kg−1 K−1)
- E a ,x :
-
Reaction activation energy (kJ mol−1)
- h :
-
Heat-transfer coefficient (W m−2 K−1)
- H x :
-
Reaction heat (J kg−1)
- I :
-
Short-circuit current (A)
- j :
-
Dimensionless volume fraction of generated SEI
- M bat :
-
Mass of this battery (kg)
- m x :
-
Reaction order
- Q dec :
-
Total heat generation of all abuse reactions (W m−3)
- Q heat :
-
Heating power (W)
- Q isc :
-
Heat generation during ISC (W)
- R x :
-
Reaction rate of each abuse reaction (s−1)
- R g :
-
Universal gas constant (J mol−1 K−1)
- R bat :
-
Resistance of the battery (Ω)
- R isc :
-
Equivalent ISC resistance (Ω)
- S :
-
Area of battery surface (m2)
- t :
-
Time (s)
- T :
-
Absolute temperature (K)
- T amb :
-
Ambient temperature (K)
- ∆T :
-
Rise of battery temperature (K)
- v :
-
Voltage (V)
- W x :
-
Mass fraction of reacting material (kg m−3)
- z x :
-
Dimensionless volume fraction
- ε :
-
Emissivity
- ρ bat :
-
Density of battery (kg m−3)
- σ :
-
Stefan–Boltzmann constant (W m−2 K−4)
- λ bat :
-
Heat conductivity of battery (W m−1 K−1)
- β :
-
Efficacy coefficient
- 0:
-
Initial or equilibrated state
- sei :
-
Solid–electrolyte interface
- e :
-
Electrolyte
- pvdf :
-
Poly (vinylidene fluoride)
- ne :
-
Negative electrode
- pe :
-
Positive electrode
- 3D:
-
Three dimensional
- ARC:
-
Adiabatic rate calorimeter
- COMSOL:
-
Inc. Sweden computer-aided engineering software developer
- ISC:
-
Internal short circuit
- NE:
-
Negative electrode
- PE:
-
Positive electrode
- PVDF:
-
Poly (vinylidene fluoride)
- SOC:
-
State of charge
- SEI:
-
Solid–electrolyte interface
- VSP2:
-
Vent sizing package 2
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Wang, B., Ji, C., Wang, S. et al. A Detailed Finite Element Model of Internal Short Circuit and Venting During Thermal Runaway in a 32650 Lithium-Ion Battery. Fire Technol 56, 2525–2544 (2020). https://doi.org/10.1007/s10694-020-00978-y
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DOI: https://doi.org/10.1007/s10694-020-00978-y