含碰撞缺陷的锂离子电池的电化学性能衰退及安全性
O347.3; 不可避免的碰撞会导致电动汽车锂离子电池出现缺陷,为了确认碰撞后的缺陷电池能否继续使用,重点研究了缺陷电池的机械性能、电化学性能、安全边界及衰退机理.首先,使用不同的压头通过准静态加载和落锤冲击对选用的电池样品分别预制了 3种典型的缺陷,即压痕、50％偏置压缩缺陷和平板压缩缺陷.随后,分别通过准静态平板压缩和充电/放电循环评估其机械和电化学响应.结果发现,缺陷电池的机械性能显著下降,包括内部短路位移、短路载荷和能量吸收能力下降.相较于无缺陷电池,缺陷电池还表现出明显的电化学性能退化,包括更严重的容量衰退.此外,通过拆解电池解释了其降解机制,基于隔膜厚度提出了电池的机械失效标准.最...
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| Published in | 爆炸与冲击 Vol. 45; no. 2; pp. 37 - 46 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
宁波大学冲击与安全工程教育部重点实验室,浙江宁波 315211
01.02.2025
宁波大学机械工程与力学学院力学与工程科学系,浙江宁波 315211 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1001-1455 |
| DOI | 10.11883/bzycj-2024-0368 |
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| Abstract | O347.3; 不可避免的碰撞会导致电动汽车锂离子电池出现缺陷,为了确认碰撞后的缺陷电池能否继续使用,重点研究了缺陷电池的机械性能、电化学性能、安全边界及衰退机理.首先,使用不同的压头通过准静态加载和落锤冲击对选用的电池样品分别预制了 3种典型的缺陷,即压痕、50％偏置压缩缺陷和平板压缩缺陷.随后,分别通过准静态平板压缩和充电/放电循环评估其机械和电化学响应.结果发现,缺陷电池的机械性能显著下降,包括内部短路位移、短路载荷和能量吸收能力下降.相较于无缺陷电池,缺陷电池还表现出明显的电化学性能退化,包括更严重的容量衰退.此外,通过拆解电池解释了其降解机制,基于隔膜厚度提出了电池的机械失效标准.最后,讨论了预制缺陷时的加载速度和缺陷类型对缺陷电池性能的影响.预制缺陷时的加载速度越高,缺陷电池的性能退化越严重,这与惯性效应有关.不同类型的缺陷会导致隔膜厚度和石墨脱粘的变化,从而造成电池性能不同程度的退化. |
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| AbstractList | O347.3; 不可避免的碰撞会导致电动汽车锂离子电池出现缺陷,为了确认碰撞后的缺陷电池能否继续使用,重点研究了缺陷电池的机械性能、电化学性能、安全边界及衰退机理.首先,使用不同的压头通过准静态加载和落锤冲击对选用的电池样品分别预制了 3种典型的缺陷,即压痕、50％偏置压缩缺陷和平板压缩缺陷.随后,分别通过准静态平板压缩和充电/放电循环评估其机械和电化学响应.结果发现,缺陷电池的机械性能显著下降,包括内部短路位移、短路载荷和能量吸收能力下降.相较于无缺陷电池,缺陷电池还表现出明显的电化学性能退化,包括更严重的容量衰退.此外,通过拆解电池解释了其降解机制,基于隔膜厚度提出了电池的机械失效标准.最后,讨论了预制缺陷时的加载速度和缺陷类型对缺陷电池性能的影响.预制缺陷时的加载速度越高,缺陷电池的性能退化越严重,这与惯性效应有关.不同类型的缺陷会导致隔膜厚度和石墨脱粘的变化,从而造成电池性能不同程度的退化. |
| Abstract_FL | Unavoidable electric vehicle collisions can cause defects in lithium-ion batteries,and whether defective batteries after minor collisions can continue to be used is still unknown.In this work,we focus on the mechanical performance and electrochemical performance of defective batteries,safety boundaries,and its failure mechanism.Firstly,three typical defects,namely indentation,50％-offset compression defect and plate-compression defect,were prepared by quasi-static loading and drop-hammer impact with different indenters.The defective batteries did not exhibit voltage drops or temperature increases,indicating that no internal short circuits occurred.Subsequently,their mechanical and electrochemical responses were evaluated through quasi-static plate compression at a loading rate of 1 mm/min and 1C charge/discharge cycling,respectively.It was found that the defective batteries exhibited significant deterioration in mechanical performance,including earlier onset of internal short circuit,reduced short circuit force,and decreased energy absorption capacity.Defective batteries also exhibited significant electrochemical performance degradation,with greater capacity loss during cycling compared to new batteries.Further,its degradation mechanism was explained through disassembling the cells.The separator of the defective batteries exhibited significant thinning,making it more prone to rupture under secondary loading.Therefore,the mechanical failure criterion of the batteries was proposed based on the separator thickness.After 500 cycles,graphite delamination was observed in the defective batteries,whereas the defective batteries without cycling only exhibited cracking.Therefore,the degradation of electrochemical performance in defective batteries was caused by the combined effects of initial defects and cyclic aging stress.The effects of loading speed and defect type on the performance of defective cells were also discussed.Defective batteries subjected to higher loading rates exhibit greater performance degradation,which is related to inertia effects.Different types of defects lead to variations in separator thickness and graphite delamination,resulting in different levels of degradation.Results are instructive for the study of safety identification and treatment of defective lithium-ion batteries. |
| Author | 姜宇新 高游 王璐冰 郑若昕 |
| AuthorAffiliation | 宁波大学冲击与安全工程教育部重点实验室,浙江宁波 315211;宁波大学机械工程与力学学院力学与工程科学系,浙江宁波 315211 |
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| Author_FL | ZHENG Ruoxin GAO You WANG Lubing JIANG Yuxin |
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| ClassificationCodes | O347.3 |
| ContentType | Journal Article |
| Copyright | Copyright © Wanfang Data Co. Ltd. All Rights Reserved. |
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| DOI | 10.11883/bzycj-2024-0368 |
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| DocumentTitle_FL | Electrochemical performance degradation and safety of lithium-ion batteries containing defects induced by collision |
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| Keywords | defective lithium-ion battery 容量衰减 safety principle 安全准则 机械缺陷 dynamic impact 缺陷锂离子电池 动态冲击 capacity degradation mechanical defects |
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| Publisher | 宁波大学冲击与安全工程教育部重点实验室,浙江宁波 315211 宁波大学机械工程与力学学院力学与工程科学系,浙江宁波 315211 |
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| Snippet | O347.3; 不可避免的碰撞会导致电动汽车锂离子电池出现缺陷,为了确认碰撞后的缺陷电池能否继续使用,重点研究了缺陷电池的机械性能、电化学性能、安全边界及衰退机理.首先,使... |
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| Title | 含碰撞缺陷的锂离子电池的电化学性能衰退及安全性 |
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