Experimental study on expansion force characteristics of LiFePO4 battery under overcharge cycles

IF 10.1 1区工程技术 Q1 ENERGY & FUELS

Applied Energy Pub Date : 2025-07-19 DOI:10.1016/j.apenergy.2025.126498

Yueyang Yu , Ping Ping , Gongquan Wang , Jiaxin Guo , Zhenkai Feng , Wei Gao , Kailong Liu , Depeng Kong

{"title":"Experimental study on expansion force characteristics of LiFePO4 battery under overcharge cycles","authors":"Yueyang Yu , Ping Ping , Gongquan Wang , Jiaxin Guo , Zhenkai Feng , Wei Gao , Kailong Liu , Depeng Kong","doi":"10.1016/j.apenergy.2025.126498","DOIUrl":null,"url":null,"abstract":"<div><div>Addressing early stage of overcharge cycling through reliable detection methods is crucial to enhancing battery reliability and lifespan. This study examines the characteristics of expansion force evolution in lithium iron phosphate (LiFePO₄) batteries during overcharge cycles under different cut-off voltages, with a view to elucidating the impact of cut-off voltage on expansion force. The results demonstrate that the expansion force and its derivative increase with the number of cycles and cut-off voltages, with the expansion during discharge being more significant than during the charging process. Furthermore, a correlation between irreversible expansion force and capacity loss has been identified, with post-mortem analysis and theoretical studies shedding light on the underlying mechanisms of expansion force evolution during overcharge cycles. Based on these findings, an early warning method based on expansion force is proposed, which can also assess the severity of failure by analyzing the expansion force derivative. This work reveals characterization of the expansion force evolution of batteries under overcharge cycling, and provides a reliable approach for the early warning strategy of slight failure due to overcharge cycling, helping to prevent the escalation of accidents.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"399 ","pages":"Article 126498"},"PeriodicalIF":10.1000,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Energy","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0306261925012280","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENERGY & FUELS","Score":null,"Total":0}

引用次数: 0

Abstract

Addressing early stage of overcharge cycling through reliable detection methods is crucial to enhancing battery reliability and lifespan. This study examines the characteristics of expansion force evolution in lithium iron phosphate (LiFePO₄) batteries during overcharge cycles under different cut-off voltages, with a view to elucidating the impact of cut-off voltage on expansion force. The results demonstrate that the expansion force and its derivative increase with the number of cycles and cut-off voltages, with the expansion during discharge being more significant than during the charging process. Furthermore, a correlation between irreversible expansion force and capacity loss has been identified, with post-mortem analysis and theoretical studies shedding light on the underlying mechanisms of expansion force evolution during overcharge cycles. Based on these findings, an early warning method based on expansion force is proposed, which can also assess the severity of failure by analyzing the expansion force derivative. This work reveals characterization of the expansion force evolution of batteries under overcharge cycling, and provides a reliable approach for the early warning strategy of slight failure due to overcharge cycling, helping to prevent the escalation of accidents.

查看原文本刊更多论文

过充循环下LiFePO4电池膨胀力特性的实验研究

通过可靠的检测方法解决过充循环的早期问题，对于提高电池的可靠性和寿命至关重要。本研究考察了不同截止电压下磷酸铁锂（LiFePO₄）电池过充电周期中膨胀力的演化特征，以阐明截止电压对膨胀力的影响。结果表明，膨胀力及其导数随循环次数和截止电压的增加而增大，且放电过程中的膨胀比充电过程中的膨胀更显著。此外，不可逆膨胀力与容量损失之间存在相关性，通过事后分析和理论研究揭示了过充循环中膨胀力演变的潜在机制。在此基础上，提出了一种基于膨胀力的预警方法，该方法还可以通过分析膨胀力导数来评估破坏的严重程度。本研究揭示了过充循环下电池膨胀力演变的特征，为过充循环引起的轻微故障预警策略提供了可靠的方法，有助于防止事故升级。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Applied Energy 工程技术-工程：化工

CiteScore

21.20

自引率

10.70%

发文量

1830

审稿时长

41 days

期刊介绍： Applied Energy serves as a platform for sharing innovations, research, development, and demonstrations in energy conversion, conservation, and sustainable energy systems. The journal covers topics such as optimal energy resource use, environmental pollutant mitigation, and energy process analysis. It welcomes original papers, review articles, technical notes, and letters to the editor. Authors are encouraged to submit manuscripts that bridge the gap between research, development, and implementation. The journal addresses a wide spectrum of topics, including fossil and renewable energy technologies, energy economics, and environmental impacts. Applied Energy also explores modeling and forecasting, conservation strategies, and the social and economic implications of energy policies, including climate change mitigation. It is complemented by the open-access journal Advances in Applied Energy.