Aiming at solving the thermal inconsistency problem caused by non-uniformity of temperature field after lithium-ion battery cells are grouped,and the thermal safety problem caused by the thermal interaction between the battery cells at high temperature. The combined method with simulation and test is adopted. Three progressive heat dissipation schemes are designed based on the heat generation-transfer mechanism of lithium-ion batteries. including individual battery cells in groups,foam cotton between the battery cells,and liquid cooling plate arranged at the bottom of the battery module respectively. Also the liquid cooling plate is optimized. The finite element software STAR-CCM+ is used to simulate the temperature distribution of the battery modules at different discharge rates for the three schemes. The results show that the increase of foam cotton can reduce the thermal interaction between the batteries,thereby improving the thermal uniformity between the battery cells. Under the heat dissipation condition of the combination with foam cotton,heat conducting plate and optimized(using liquid cooled pipeline series parallel combination) liquid cooling system,the maximum temperature of the battery module is 35.08 ℃ at 2C discharge rate,and the maximum temperature difference is only 4.85 ℃. The research results can provide a theoretical basis for the structure design of cooling system for battery thermal management.