摘要
在锂电池注液前须对锂电池电芯进行真空环境下的烘烤,热氮气作为烘烤介质,通过管道进入烘烤罐内。现有的通气管具有一个进气总管和若干个小出气管,但实际烘烤工作中发现,烘烤罐内的同批锂电池电芯烘烤后一致性很差,这会对电芯以后的注液等工序造成不能挽回的影响。根据流体力学等知识重新设计罐内通气管,通过详细计算罐内的各种能量损失,并运用CFD仿真软件对优化前后的通气管进行内部流体仿真分析。通过绘制管道的能量水头线,可详细观察罐内各位置的流体与能量等的参数大小及变化情况。结果表明,当进气管热氮气流速为10 m/s时,优化后的通风管的各出气管流出速度一致性较之前改善97.7%;涡流能量损失减少84%。此法可针对不同型号的锂电池尺寸进行各个出气管的位置与管径设计,并根据热氮气流速初步计算烘烤所需时间,避免了对现有烘烤时间的盲目性。对相似的真空烘烤工艺具有重要指导意义。
Herein ,we addressed the non-uniformity problem in baking Li-ion battery cores with hot N2 gas via design optimization of gas inlet pipeline. First, the flow fields of the baking oven, including the chamber, conventional and newly-designed configurations of gas inlet pipelines ,were mathematically modeled, theoretically analyzed and numerically simulated with CFD software. The influence of the N2 flow-rate and pipelines geometry on the flow fields, energy consumption and baking time was investigated. The simulated results show that the hot N2 flow-rate and inlet pipeline arrangement all have a major impact. For example, at a N2 flow-rate of 10m/s, the uniformity of inlet N2 through the optimized inlet pipelines was improved by 97.7% ; and the energy-loss induced by N2 turbu- lence wasd ecreased by 84%. Moreover, the backing time was tentatively estimated in terms of the radius/position of inlets, N2 flow-rate, and Li-ion battery size.
作者
姜钊
关玉明
商鹏
邱子桢
Jiang Zhao;Guan Yuming;Shang Peng;Qiu Zizhen(School of Mechanical Engineer, Hebei University of Technology, Tianfin 300130, China;China Information Center for Lithium Energy Battery Equipment, Hebei University of Technology, Tianjin 300130, China)
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2018年第5期353-357,共5页
Chinese Journal of Vacuum Science and Technology
基金
天津市科技支撑项目(14JCTPJC00532)
