The thermal runaway propagation characteristics of lithium iron phosphate batteries under different states of charge were studied, and the energy flow distribution of the battery during thermal runaway propagation was obtained. Firstly, the influence of the state of charge on the thermal runaway propagation behavior is analyzed, the average heat transfer power is calculated based on the heat transfer theory, and then the heat transfer is calculated, and the proportional relationship of heat transfer through different heat transfer paths is revealed.
Thermal runaway mechanism and ** model of 280ah lithium iron phosphate battery
The thermal runaway mechanism of 280Ah lithium iron phosphate battery was studied by a combination of experimental and first-class methods, and a thermal runaway model suitable for multiple scenarios was established. Firstly, based on the comprehensive DSC experiments of battery materials, the timing of the internal side reactions in the case of thermal runaway of the battery, and based on the DSC experiments at multiple heating rates, the activation energy and pre-index factors of the main side reactions were obtained by combining the Kismsinger method, and other model parameters were obtained by nonlinear fitting. Based on the experimental research, the thermal runaway** model was established, and the effectiveness of the model was verified by the ARC experiment and the side heating thermal runaway experiment, so as to further analyze the internal temperature distribution of the battery and the characteristics of the battery during thermal runaway.
Barrier effect of different thermal insulation materials on the thermal runaway propagation of 280 ah lithium iron phosphate battery (click to read the original article).
The inhibition effect of different thermal insulation materials on the thermal runaway propagation of the battery under different layout modes was explored through experiments, and the peak temperature of the protected battery under different barrier conditions was obtained, and the influence of heat transfer inside the battery module on the protected battery under the partition barrier layout mode (placing thermal insulation materials every three cells) was revealed.