双相多孔锂离子电池液/固界面的声反射与声透射  

Acoustic reflection and transmission at the interface between two-phase porous lithium-ion battery and liquid media

作　　者：高杰[1] 王香苓 吕炎[1] 宋国荣[1] 张斌鹏 何存富[1] GAO Jie;WANG Xiangling;LYU Yan;SONG Guorong;ZHANG Binpeng;HE Cunfu(Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124;Hexagon Manufacturing Intelligence Qingdao Co.,Ltd.,Qingdao 266101)

机构地区：[1]北京工业大学材料与制造学部,北京100124 [2]海克斯康制造智能技术(青岛)有限公司,青岛266101

出　　处：《声学学报》2023年第1期138-147,共10页Acta Acustica

基　　金：国家自然科学基金项目(12072004,11872082);北京市教委科研计划重点项目(KZ202110005005)资助。

摘　　要：采用传递矩阵法,同步联立改进的Biot理论,对含液固界面的双相多孔锂离子电池的超声反射与透射系数进行理论求解。考虑锂离子的摇摆特性对电极力学性能的影响,计算了对应状态下液/固界面的双相多孔锂离子电池声反射及透射系数的角度谱与频率谱。同时,构建了不同荷电状态时含单元锂离子电池的频域仿真模型,以萃取对应的超声反射及透射角度谱及频率谱,并与理论计算结果对比吻合良好。随后,以多单元锂离子电池为例,在不同的荷电状态下,分析了反射与透射系数随斜入射角度、入射波频率的变化关系,并分别指出了其角度谱及频率谱特征点随荷电状态的变化特征,为锂离子电池运行状态的超声无损测量提供了理论基础。Based on the combination of transfer matrix method and Biot theory,the acoustic wave reflection and transmission coefficients was theoretically calculated at the liquid/solid interfaces between two-phase porous lithium-ion battery and liquid media.Meanwhile,the influence of the swing characteristics of lithium-ion on the mechanical properties of electrode was considered,and the theoretical prediction of electrode density and elastic modulus under different states of charge is realized.The angle spectrum and frequency spectrum of reflection and transmission coefficients for corresponding state lithium-ion battery can be obtained by the proposed method.Then,a frequency domain simulation model of the multi-layered porous lithium-ion battery was established,and the reflection and transmission coefficients obtained by finite element method for lithium-ion battery are consistent with those results by the proposed approach.For the case of multi-cell lithium-ion battery,the relationship between reflection/transmission coefficients,oblique incident angle or frequency under different azimuth angles are analyzed.The shift law of the characteristic point curves in the angle spectrum and frequency spectrum with the change of the state of charge of the lithium-ion battery is analyzed.It provides a theoretical basis for the ultrasonic measurement of the state of charge of lithium-ion batteries.

关 键 词：锂离子电池 荷电状态 透射系数 超声反射 BIOT理论 频率谱 对应状态 无损测量 

分 类 号：TM912[电气工程—电力电子与电力传动]