锂电池组高温节点空气冷却方案的数值模拟

To ensure the safety and efficient operation of power batteries, a three-dimensional numerical model of a stagger-arranged battery pack was established to explore the effects of air supply velocity, number of fins, and thermal conductivities of fins and fixed parts on the thermal characteristics and pressure drop inside the battery pack. Numerical results show that the fixed parts made of traditional epoxy (λ=0.2 W·m^-1·K^-1) between batteries more significantly increase the maximum temperature inside the battery pack compared with the case without fixed parts, and the temperature difference between these two cases is about 12 K. Moreover, the difference of pressure drop between these two cases gradually increases with Reynolds number. It is demonstrated that the numerical model of the stagger-arranged battery pack without fixed parts distinctly underestimates the maximum temperature and pressure drop. As air coolant is of laminar flow inside the stagger-arranged battery pack, the optimal thermal conductivity of fixed parts is 2 W·m^-1·K^-1. The temperature distribution inside the battery pack can be improved effectively by the fins associated with an increment of pressure drop less than 10%.