关键词: 锂离子电池, 安全性, 不稳定性, 传热, 相变材料

Abstract: Li-ion battery as the energy storage and power source system for EV(s)/HEV(s), which is limiting the EV(s) development due to the safety, reliability and stability. Besides, the performance of Li-ion battery is very sensitive to temperature; and over-high temperature and inhomogeneous can result a sharp drop in battery performance. The phase change materials (PCM) was prepared by paraffin/expanded graphite/low density polyethylene (PA/EG/LDPE) and used as a heat dissipation method for battery module. Experiment to tests the heat dissipation ability of the battery module with or without phase change materials. The temperature, voltage and internal resistance of the battery are collected in real-time by the data collector, and the trend of the parameters is analyzed qualitatively. The results demonstrated that the composites of PA/EG/LDPE have an excellent heat dissipation capability and temperature uniformity capability. The battery module of maximum temperature and maximum temperature gradient are controlled within 55℃ and 5℃, respectively.

Key words: Li-ion battery, safety, instability, heat transfer, phase change material