EPDM阻燃热防护材料在锂离子电池热失控中的研究

The effects of flame retardant and material thickness on the properties of ethylene propylene diene monomer (EPDM) flame retardant thermal protection materials were investigated, and the application of flame retardant EPDM in the lithium-ion battery pack was evaluated. Results show that, the back temperature of EPDM with flame retardant is lower than the temperature of EPDM without flame retardant, the back temperature of EPDM decreases and the flame retardant performance improves with the load of flame retardant and the increase of sample thickness. When the ignition temperature is 500℃, the final stable back temperatures of EPDM with a thickness of 3 mm and 6 mm are 185.1℃ and 165.7℃ respectively. Taking the flame retardant EPDM with 3 mm thickness as the protection of the lithium-ion battery pack, a thermal runaway test was carried out. The test results show that, only one battery explosion occurs with thermal protection, and all five batteries explode without thermal protection in the battery pack. And then, taking a battery pack as the center of the area coverage, an explosion experiment of the lithium-ion battery pack was completed to analyze the thermal protection effect of flame retardant EPDM. The results show that, the temperature of the battery pack in the surround region about the radius 30 cm can be affected by the explosion of the battery without thermal protection of flame retardant EPDM, causing the field temperature up to 300℃, being very dangerous. After protecting the lithium-ion battery with EPDM thermal protection material, the temperature in this area fluctuates between 20~28℃, which is a very safe temperature range.