A novel stable and flexible composite phase change materials for battery thermal management

• SEBS/POE-based FCPCM with shape stable and flexible is prepared. • The prepared FCPCM has room temperature flexibility. • Contact thermal resistance has temperature characteristics. • Battery thermal management performance of the FCPCM has been visually studied. Phase change material (PCM) is a hot topic in the field of battery thermal management (BTM) for their high latent heat and excellent temperature homogeneity. However, it is limited by the problems such as easy leakage, low thermal conductivity, high rigidity. Herein, we prepared a novel stable and flexible composite phase change materials (FCPCM) successfully. Paraffin (PA)was employed as PCM, Ethylene-ethylene-butadiene-styrene block copolymers (SEBS) as support material, polyethylene octene co-elastomers (POE) as flexibility enhancer, and Expanded graphite (EG) was selected to boost the thermal conductivity. Experimental results showed that the FCPCM leakage rate remained below 1%. Furthermore, the thermal resistance test showed that the contact thermal resistance decreases from 0.735 °C/W to 0.119 °C/W as the temperature rises from 37.35°C to 53.41°C. In addition, the battery cycle test showed that during 3C rates, FCPCM could control the temperature of the battery module at 41.56°C, which was lower 11.56℃ than NOPCM module. What’s more, Regardless of 1C or 3C cycle, the temperature difference of FCPCM module can be controlled within 1.35℃.