Research on the heat dissipation performances of lithium-ion battery pack with liquid cooling system

Lithium-ion power batteries have been applied to the new energy vehicles. However, the lithium-ion battery pack performances will be significantly decreased if the temperature is too high, according to the battery electrochemical characteristics. In order to the lithium-ion battery pack has great performances, the temperature should be kept in a appropriate range by a cooling system. Thus, this paper focused on the heat dissipation characteristics of the lithium-ion battery pack under various liquid cooling system parameters based on the synergistic analysis method. The results revealed that the liquid cooling system with the initial coolant temperature of 15℃ and the flow rate of 2L/min has better synergistic performances, and can effectively strengthen the cooling performances of the battery pack. With the charge/discharge rate increases, the battery heating power raises, the temperature and its synergy angle increase significantly. When the cooling channel inlets number is set as 3, the optimum cooling effect is got and the temperature difference of the battery pack is the smallest.