反应工程方法在锂电池真空干燥模拟上的应用

锂离子电池注液之前的真空干燥，对于电芯的循环性能、安全性、稳定性有极其重要的影响。电芯结构设计、材料体系、烘箱尺寸等的不同会导致真空干燥过程存在差异。反应工程方法(REA)在常压、高初始水含量的对流干燥模拟预测上已有广泛应用，本研究将REA干燥理论应用于真空、低初始水含量的干燥过程仿真，发现与实验结果匹配良好。同时考虑了电芯气袋与烘箱环境湿度变化对干燥过程的影响，水含量预测偏差小于10%，利用单因子仿真实验所总结的规律能用于指导锂电池真空干燥工艺的改善。介绍了该模型在生产中的应用情况，也表明REA将在锂电池真空干燥预测上有很好的工业应用前景。

Application of reaction engineering approach in modelling vacuum baking of lithium battery

Vacuum baking before electrolyte injection has an important impact on the cycling performance, safety and stability of lithium battery. Differences in cell structure design, material system, oven size, etc. will lead to differences in the vacuum drying process. For vacuum baking, drying performance varies with different cell design, materials and oven size. Reaction engineering approach (REA) to drying modelling has been widely used for convective drying under atmospheric pressure and high initial water content materials. Here, REA was applied to the extremely low moisture process for battery vacuum baking. The results matched well with the experimental results. The influence of environmental humidity on drying process is considered in this work, and the prediction error is less than 10%. The rules of thumb established in this work by single factor experiment can guide the improvement of vacuum drying process of lithium-ion battery. The application in mass production is also briefly introduced here. The current work has demonstrated that REA can have excellent application in vacuum drying for lithium battery.