Efficient purification of Metal-organic framework and its trigger strategy in battery thermal management system

•A MOF-based structure with high thermal conductivity is proposed.•A trigger strategy for controlling the desorption of MOF is proposed.•A novel purification reduces the cost of MIL-101(Cr) by 91%.•The temperature rise of the cell is controlled below 3.8℃. Metal-organic framework (MOF) MIL-101(Cr) is a sorbent that can adsorb large amounts of water, but its performance is compromised by low thermal conductivity and unstable desorption temperature. In addition, the high cost restricts its application in thermal management. We propose a novel purification method, which reduces the cost of MIL-101(Cr) by 91%. Then, based on MIL-101(Cr) and micro heat pipe array (MHPA), we design an innovative thermal management structure with great performance, MHPA@MIL-101(Cr). To cope with extreme conditions, a trigger strategy based on active dehumidification and air-cooling technologies is used to improve the temperature and temperature uniformity of cells, and the effect of their trigger time on the desorption temperature of MIL-101(Cr) is studied. In a normal condition (25℃), the zero-energy-consumption structure controls the maximum temperature (Tmax) of the battery module below 35.99℃ at 2C rate (112A). What is more, the trigger strategy improves the temperature characteristics in an extreme condition (35℃). As a result, the Tmax is controlled at 38.8℃ when the battery module is 2C (112A) discharged, a temperature rise of only 3.8℃.