Electrochemical-thermal coupled modelling and multi-measure prevention strategy for Li-ion battery thermal runaway.

• A novel design for BTMS is proposed to separate the propagation of thermal runaway. • Th BTMS unites phase change cooling, liquid cooling and thermal insulation material. • The electrochemical-thermal and heat transfer-laminar flow coupling model is built. • The influence of coolant flow rate on the novel BTMS in the extreme case is analyzed. Nowadays, electric vehicles attract much attention due to the advantages of low energy consumption and zero emission. As the power source of electric vehicles, the safe and stable operation of lithium ion battery is very important. However, owing to overcharge, mechanical collision, overheating or other conditions, the battery may occur thermal runaway, which can cause serious accidents such as fire or explosion. To solve this problem, an efficient and energy-saving battery thermal management system becomes a necessary choice. In this paper, a novel integrated battery thermal management system with multi-measure prevention strategy is designed and analyzed, which is mainly composed of the composite phase change material, aerogel and cooling-channel. Firstly, the electrochemical-thermal coupling mathematical model is established, and then the reliabilities of thermal runaway model, phase change cooling model and liquid cooling model are verified, respectively. Next the numerical simulation including the effect of different operating modes, extreme case and coolant flow rate on the battery thermal management system is carried out, and finally the results are discussed in detail. The results show that the battery thermal management system can not only quickly take away the accumulated heat and separate the propagation of thermal runaway, but also maintain the temperature uniformity of battery. [Display omitted] [ABSTRACT FROM AUTHOR]