A novel battery thermal management system based on P type triply periodic minimal surface.

• A novel liquid-cooled BTMS with TPMS sheet structure for cylindrical LIB is proposed. • The BTMS with TPMS sheet structure can improve thermal performance than that with the straight tube. • The inner skeleton structure improves the cooling performance of BTMS than the outer skeleton structure. • The temperature consistency of the battery module is enhanced by the gradient design of parameter c along the flow direction. As an effective cooling method, liquid-cooled battery thermal management system (BTMS) is crucial to maintain the performance of the battery packs. Triply periodic minimal surface (TPMS) is a mathematically described surface with large surface area and tortuous regions. These features allow the TPMS-based structures to be used as the internal filling structures of the heat exchangers for thermal performance improvement. In this study, the TPMS-based internal filling structures in the liquid-cooled BTMS are proposed. The results demonstrate that the cooling performance and temperature consistency of the battery module can be enhanced by filling the TPMS-based structures in the cooling channel. Compared with the conventional straight tube, at the inlet flow rate of 0.003 kg/s, the maximum temperature and temperature difference of the battery module in the BTMS with the sheet structure decrease by 9.0% and 59.8%, respectively. In addition, the gradient sheet structure is designed to alleviate the temperature gradient of the coolant in the flow direction. The results illustrate that the temperature difference of the battery module in the gradient sheet structure decreases by 15.7% than that in the uniform sheet structures (c = ±0.5). This study can provide a new approach for thermal performance enhancement of the liquid-cooled BTMS. [ABSTRACT FROM AUTHOR]