Abstract
The thermal runaway of lithium power battery is the key problem of battery safety, according to the standard SAE J2464–2009 single point heating key position, the proposed multi-point trigger based thermal runaway of lithium power battery module simulation method and battery module thermal runaway battery monomer ratio PN, thermal runaway trigger time tn two indicators, the thermal runaway rule of 18650 lithium power battery module under different trigger position, trigger points. The results show that considering the external thermal insulation conditions of the power lithium battery module, the geometric angular position in the module is the most dangerous position, and the number of thermal trigger points is positively correlated with PN.
Highlights
Thermal runaway refers to the uncontrolled rise of battery temperature caused by a chain reaction of heat release from the battery monomer, and the safety of lithium-ion battery as the core component of electric vehicles, which restricts the development of electric vehicles
Different from the above literature, this paper takes the square module composed of cylindrical lithium battery 18650 monomer as the object of study, constructs the 3D thermal abuse model, performs the single point thermal trigger for the power battery module at the five recommended locations in the American standard SAE J2464-2009, and calculates the percentage and time of thermal runaway of the battery monomer in the module to obtain the most likely location of thermal runaway in the module
According to the American standard SAE J2464-2009 recommended thermal trigger point, the paper carried out single-point and multi-point thermal trigger simulation experiments
Summary
Thermal runaway refers to the uncontrolled rise of battery temperature caused by a chain reaction of heat release from the battery monomer, and the safety of lithium-ion battery as the core component of electric vehicles, which restricts the development of electric vehicles. Ji Changwei et al (2019) of Beijing University of Technology conducted a central position heating test on a battery module composed of 32650 battery monomers to study the rule of triggering thermal runaway of the battery module as a whole under single-point thermal triggering conditions, but did not involve the overheating of the module at multiple points to generate thermal runaway [3]. Different from the above literature, this paper takes the square module composed of cylindrical lithium battery 18650 monomer as the object of study, constructs the 3D thermal abuse model, performs the single point thermal trigger for the power battery module at the five recommended locations in the American standard SAE J2464-2009, and calculates the percentage and time of thermal runaway of the battery monomer in the module to obtain the most likely location of thermal runaway in the module. On the basis of multi-point thermal trigger, we study the thermal runaway rule of the module under different locations and different number of trigger points
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