Effective Heat Dissipation for Prismatic Lithium-ion Battery by Fluorinated Liquid Immersion Cooling Approach

In this study, experiments were performed to investigate the cooling effect of liquid immersion cooling based on SF33 for 8 Ah prismatic lithium-ion battery. First, the cell temperature variations under high C rates discharging with natural convection and liquid immersion cooling were compared. The results reveal that liquid immersion cooling has good cooling performance and can limit the maximum temperature of the cell to be below 33.25 degrees C and 35 degrees C even under ultra-fast discharging for 5C and 8C. Then, the effects of cell spacing and liquid filling levels were explored. The cell spacing has less effect on the cooling performance. Meanwhile, the influence of liquid filling level on the cell temperature and temperature uniformity is found to be significant. Finally, the two-phase heat transfer phenomenon of liquid immersion cooling was observed and recorded to investigate the mechanisms for the shifting from single phase natural convection to two-phase boiling heat transfer.