化工学报 ›› 2022, Vol. 73 ›› Issue (7): 3262-3272.DOI: 10.11949/0438-1157.20220141

• 能源和环境工程 • 上一篇    下一篇

反应工程方法在锂电池真空干燥模拟上的应用

杨兴富1(),陈文1,肖杰2,陈晓东2   

  1. 1.宁德新能源科技有限公司,福建 宁德 352100
    2.苏州大学材料与化学化工学部,化工与环境工程学院,江苏 苏州 215123
  • 收稿日期:2022-01-19 修回日期:2022-04-09 出版日期:2022-07-05 发布日期:2022-08-01
  • 通讯作者: 杨兴富
  • 作者简介:杨兴富(1988—),男,硕士,工程师,575591751@qq.com

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

Xingfu YANG1(),Wen CHEN1,Jie XIAO2,Xiaodong CHEN2   

  1. 1.Amperex Technology Limited, Ningde 352100, Fujian, China
    2.School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, Jiangsu, China
  • Received:2022-01-19 Revised:2022-04-09 Online:2022-07-05 Published:2022-08-01
  • Contact: Xingfu YANG

摘要:

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。

关键词: 锂电池, 真空, 干燥, 反应工程方法, 蒸发, 模拟

Abstract:

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.

Key words: lithium battery, vacuum, baking, reaction engineering approach, evaporation, simulation

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