基于时变模型的锂电池极片涂布质量数值模拟研究  

Numerical simulation of coating quality of lithium battery pole piece based on time-varying model

作　　者：马帅鹏 李江陈 殷德顺[1] 李灿琦 MA Shuaipeng;LI Jiangchen;YIN Deshun;LI Canqi(College of Mechanics and Engineering Science,Hohai University,Nanjing Jiangsu 211100,China)

机构地区：[1]河海大学力学与工程科学学院,江苏南京211100

出　　处：《电源技术》2025年第3期563-568,共6页Chinese Journal of Power Sources

摘　　要：在锂电池极片涂布数值模拟中,人们经常忽略浆料的时变性,而采用相对简单的非时变本构模型进行模拟。因此,出现模拟结果和实际涂布效果不相符的现象。将时变性幂律模型引入锂电池极片狭缝挤压涂布工艺的数值仿真研究中,进行了狭缝挤压涂布的内外、流场模拟,结果表明,时变系数虽然对浆料出口速度和最终涂层厚度影响不大,但会明显影响最终涂布的均匀性。进一步研究发现,随着时变系数增大,时变和非时变模型模拟结果的差异会更加明显。可见,通过时变模型模拟锂电池极片涂布质量问题,数值模拟结果更加符合实际涂布情况。In the numerical simulation of lithium battery electrode coating,the time-varying characteristics of slurry is often ignored,and a relatively simple time-invariant constitutive model is used to simulate.Therefore,the simulation results are inconsistent with the actual coating effect.The time-varying power law model was introduced into the numerical simulation study of the slit extrusion coating process of lithium battery,and the internal and external flow field of the slit extrusion coating was simulated.The results show that although the time-varying coefficient has little influence on the exit velocity of the slurry and the final coating thickness,it will obviously affect the uniformity of the final coating.Further research shows that with the increase of the time-varying coefficient,the difference between the simulation results of time-varying and time-invariant models becomes more obvious.It can be seen that the coating quality of lithium battery electrode is simulated by time-varying model,and the numerical simulation results are more consistent with the actual coating situation.

关 键 词：狭缝挤压涂布 时变性 数值模拟 内外流场 时变系数 

分 类 号：TM912[电气工程—电力电子与电力传动]