As the capacity of individual energy storage battery cells continues to increase, their heat generation power also rises, making traditional cooling methods increasingly inadequate to meet the system's heat dissipation requirements. This paper investigates the cooling methods for 314Ah high-capacity battery cells and energy storage battery packs. Through simulation, the heat dissipation processes of bottom liquid cooling and side liquid cooling are compared. Additionally, a corresponding experimental platform was set up in the laboratory to conduct practical tests on the heat dissipation effectiveness of bottom liquid cooling, observing the temperature changes of the battery pack under different cooling methods and studying the impact of different flow rates on temperature. The simulation and experimental results show that the maximum temperature of the battery pack with bottom liquid cooling is 34.74 ℃, while that with side liquid cooling is 27.22 ℃. The side liquid cooling method demonstrates superior performance in reducing the battery pack temperature, offering higher heat dissipation efficiency and better temperature control, providing valuable insights for the design of energy storage battery packs.