冲击载荷下不同荷电状态结构化锂离子电池负极响应分析  

Analysis of Anode Electrodes of Structured Batteries at Different States of Charge Under Impact Loading

作　　者：刘思奇 郑百林[1] 张锴[1] 张卓 LIU Siqi;ZHENG Bailin;ZHANG Kai;ZHANG Zhuo(School of Aerospace Engineering and Applied Mechanics,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学航空航天与力学学院,上海200092

出　　处：《力学季刊》2023年第2期306-315,共10页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(11672210);上海市自然科学基金(23ZR1468600)。

摘　　要：传统的锂离子电池研究多注重本身相关机理以及储能能力的提高,而结构化电池不仅能够储能,且可以作为结构本身承受一定载荷.本文设计了一种新型结构化电池石墨负极板,通过修正准静态下石墨的力学指标得到对应高应变率下的压缩应力-应变曲线、失效应变,采用数值分析方法对石墨负极板的承载能力进行了分析.同时,由于荷电状态(State of charge, SOC)会影响石墨的弹性模量、失效应变、厚度以及压缩应力-应变曲线等力学性能,因此在石墨的本构方程中考虑并修正了SOC产生的影响.通过有限元模拟了不同SOC下石墨负极板受到冲击后的响应,结果表明随着应变率或SOC增大,石墨负极板承载高速冲击的能力也随之降低.本文的研究成果可以为结构化电池负极的结构设计提供参考.Traditional research on lithium batteries mostly focuses on the mechanism of battery itself and the improvement of energy storage capacity,while structured batteries can not only store energy,but also withstand certain loads as a structure itself.In this paper,a new structured battery graphite anode plate is designed.The compressive stress-strain curve and failure strain corresponding to high strain rate are obtained by modifying the quasi-static mechanical index of graphite,and the load-bearing capacity of the graphite anode plate is analyzed by numerical method.Meanwhile,since the state of charge(SOC)affects the mechanical properties of graphite such as elastic modulus,failure strain,thickness and compressive stress-strain curves,the effects of SOC are considered to modify the principal equations of graphite.The response of the graphite anode plate after impact is simulated by finite element method with different SOC.The results show that the ability of the graphite anode plate to carry highspeed impact decreases as the strain rate or SOC increases.The results of this paper can provide reference for the structural design of structured battery anodes.

关 键 词：结构化锂离子电池 SOC 石墨负极率相关耦合本构 冲击载荷仿真 

分 类 号：TM910.3[电气工程—电力电子与电力传动] TB122[理学—工程力学]