(中南大學 冶金與環(huán)境學院，長沙 410083)
摘 要: 基于COMSOL MULTIPHYSICS 平臺建立三維熱仿真模型，定量分析不同工作電流條件下的溫度分布。結果表明：單體及模塊最高溫度集中在中心區(qū)域，溫度呈輻射狀由內(nèi)向外逐漸降低。在換熱系數(shù)20 W/(m2·K)作用下，低于8C倍率放電可使單體電池工作在正常溫度范圍，而使三并五串電池模塊最高溫度在正常范圍，放電電流應低于5C；在5C倍率下放電結束后，荷電狀態(tài)(SOC)為0模塊中心電池最高溫度達到322.88 K，比同倍率絕熱條件下單體最高溫度僅低2.81 K。
關鍵字: 鋰離子電池；熱模型；溫度分布；仿真
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:A three-dimensional thermal simulation model was established based on the finite element commercial software COMSOL MULTIPHYSICS to analyze the influence of different discharge rates on temperature distribution. The results show that the highest temperature locates at the central area, and the temperature decreases from inside to outside. Besides, the single cell can work well below 8C discharge current when the coefficient of heat transfer is set to 20 W/(m2·K), but 5C for the module. The highest temperature of the central cell of the module under 5C is 322.88 K, only 2.81 K lower than that of single lithium-ion battery working at adiabatic condition nearly.
Key words: lithium-ion battery; thermal model; temperature distribution; simulation
