A novel preheating method for the Li-ion battery using supercooled phase change materials  

作　　者：FANG XuanYi NONG XinLu LIAO ZhiRong XU Chao 

机构地区：[1]Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education,School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China

出　　处：《Science China(Technological Sciences)》2023年第1期193-203,共11页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 51821004, 51876061);the Interdisciplinary Innovation Program of North China Electric Power University。

摘　　要：The Li-ion battery is widely used in power tools, energy storage systems, and electric vehicles. In reality, battery thermal management is essential to control the battery temperature within a specific temperature range. Although research has shown that preheating the battery at low temperatures on cold days can improve output performance significantly, few efforts have been made to study the preheating method in-depth. As a result, this research proposes two preheating designs for cylindrical batteries with supercooled phase change materials: Single-and dual-phase change material(PCM) designs. A mathematical model is developed to analyze the effect of the PCM layer’s height, thickness, and mass on the preheating effect for seven candidate PCMs with high supercooling degrees. Furthermore, the economic efficiency of the single-PCM design with different PCMs is compared. In addition, the optimal ratio of the PCMs’ height for the dual-PCM design is investigated. Eventually, the improvement of the battery’s output performance is discussed. The results reveal that the proposed designs can effectively preheat the battery with a temperature rise higher than 10°C. The single-PCM design using Li NO3·3H2O shows the best preheating ability, while CH3COONa·3H2O is the most economical. Although the dual-PCM design cannot outperform the single-PCM design, it can preheat the battery twice and show better flexibility. Compared with the battery without preheating, a 26650-format battery with the single-PCM design can prolong the operating time by 38.8 min and save the electric quantity by 2.1 A h;while they are by 42.8 min and 2.3 A h with the dual-PCM design.

关 键 词：preheating method Li-ion battery phase change material SUPERCOOLING 

分 类 号：TM912[电气工程—电力电子与电力传动]