一种锂离子电池电芯真空烘烤工艺的研究  

A type of vacuum baking technique for cells of lithium ion batteries

作　　者：关玉明[1] 姜钊[1] 赵芳华[1] 邱子桢 于盼[1] GUAN Yu-ming;JIANG Zhao;ZHAO Fang-hua;QIU Zi-zhen;YU Pan(School of Mechanical Engineering,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]河北工业大学机械工程学院,天津300130

出　　处：《电源技术》2018年第11期1622-1624,1659,共4页Chinese Journal of Power Sources

基　　金：天津市科技支撑项目(14JCTPJC00532)

摘　　要：针对现有锂离子电池电芯烘烤工艺的不足,提出一种新型电芯烘烤工艺,包含电芯进出烘烤箱的结构设计,可省去电芯干燥过程的人工运输,提高生产率。首次提出了通过分析氮气在烘烤罐内能量损失情况来得到氮气进口流速大小的方法,应用Fluent仿真软件进行氮气在烘烤罐内的流速场分析。结果表明:圆形烘烤箱较传统方形烘烤箱更利于电芯在烘烤过程的排水及防氧化;当进气管内氮气初始流速为8 m/s时,烘烤耗时35 min,同时烘烤中的各个电芯不同截面中风速大小均在93%以上,能够很好地达到电芯烘烤的一致性,可为实际电芯烘烤过程提供理论依据和指导。A new type of baking technique for cells of lithium ion batteries was proposed based on the disadvantages of current baking technique. The design of structure for cells getting inside or out of the baking chamber was taken into account, which would save the labor transportation during the drying process of cells and improve the productivity. The method to calculate the flow velocity for the inlet nitrogen gas based on the energy loss of nitrogen gas in the baking chamber was put forward for the first time. Meanwhile, the Fluent simulation software was adopted to analyze the flow velocity field of the nitrogen gas inside the baking chamber. The results show that： compared with the traditional square baking chamber, the round baking chamber is more superior for cells in terms of water drainage and anti-oxidation in the process of baking. In the case where the initial flow velocity of nitrogen gas inside the inlet pipe reaches 8 m/s, the whole baking process costs 35 minutes and the uniformities of wind velocities for different cross sections of each cells in the baking process all exceed 93% ensured, which will provide theoretical basis and guidance for the actual a proper baking consistency of cells can be baking process of cells.

关 键 词：锂离子电池 烘烤工艺 流体仿真 均匀性 

分 类 号：TM912.9[电气工程—电力电子与电力传动]