| Citation: | SHI Shang, YU Jianzu, XIE Yongqi, et al. Temperature rise characteristic of lithium battery integrated thermal management system combining phase change materials with air cooling[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(6): 1278-1286. doi: 10.13700/j.bh.1001-5965.2016.0831(in Chinese)
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A large amount of heat inside the lithium battery must be dissipated to ensure the safety of the battery by using high efficiency thermal management system (TMS) at high charging/discharging rates. A newly designed TMS integrating phase change material with air cooling was designed and its temperature rise characteristic was investigated theoretically and experimentally. Based on the lumped parameter method and the heat transfer mechanism, the mathematical models of temperature rise and heat generation power were developed for the battery. The battery heat generation power was calculated. The key parameters of ambient temperature, initial temperature, phase change temperature, convective resistance and conductive resistance between the battery and the phase change material affecting the performance of the integrated TMS were analyzed. The results indicate that the performance of the integrated TMS is superior to the pure air cooling system. In the non-steady process of temperature rise during charging and discharging, the higher initial temperature easily causes the battery to exceed the safe temperature. The mathematical model of the battery temperature field can accurately describe the battery temperature rise characteristic. At high ambient temperature, the maximum temperature rise of battery declined, but it may cause the maximum temperature to exceed the safe temperature. The higher phase change temperature is, the lower battery maximum temperature rise is. Reducing conductive resistance or convective resistance can significantly improve the performance of the TMS.
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