Thermal management of Li-ion battery based on honeycomb-structured fins-modified phase change material

In this paper, a battery thermal management system (BTMS) based on honeycomb-structured fins-modified phase change material (PCM) is constructed to address the thermal safety issues of electric vehicles under high discharge rates. The effect of the structural parameters (fin spacing, fin width, fin thickness) of honeycomb fins on the heat dissipation performance of BTMS is discussed in detail. Moreover, the influence of the honeycomb structural design of fins on the energy density and the PCM volume is further investigated. The cooling performance and mechanism of BTMS with honeycomb fin-modified PCM under high-rate working conditions are presented. Compared to the BTMS with finless PCM, the BTMS with honeycomb fins-modified PCM shows a reduction of 26.52% in the battery temperature and an increase of 47.6% in the utilization efficiency of PCM. The honeycomb fins modified PCM based-BTMS exhibits prominent advantages in lowering battery temperature, promoting temperature uniformity, and increasing PCM utilization efficiency at a high discharge rate of 8C, making it suitable for high power operation requirements. The research findings offer theoretical and data support for the design of BTMS in electric vehicles.