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The refrigerant can effectively cool the battery by evaporating with a poor economy. This paper presents a novel battery thermal management system (BTMS) named dual flow medium system (DFMS), more economical than the refrigerant cooling scheme. The DFMS contains two methods of battery cooling: evaporative cooling by the refrigerant (R134a) and convective cooling by the coolant (glycol solution with a volume fraction of 50%). A validated simulation model was used to investigate the DFMS. Firstly, the impact factors of the evaporative cooling were explored by orthogonal analysis. The results show that the lower compressor speed, superheat, and external temperature can obtain a higher economy. Furthermore, the power consumption of the DFMS can be saved by 36.51% compared to the BTMS that uses only refrigerant to cool the battery. Finally, how to allocate the heat transfer area of the battery pack bottom to refrigerant tubes and coolant tubes was studied. The results illustrate that the power consumption of the DFMS can be effectively reduced by 19.96% and 23.85% in the cold region and the hot region by adopting an appropriate heat transfer area allocation, respectively. The proposal of the DFMS provides a new idea for the design of BTMS.