Comprehensive Battery Safety Risk Evaluation: Aged Cells versus Fresh Cells Upon Mechanical Abusive Loadings,Advanced Energy Materials

当前位置： X-MOL 学术 › Adv. Energy Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Comprehensive Battery Safety Risk Evaluation: Aged Cells versus Fresh Cells Upon Mechanical Abusive Loadings
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-05-10 , DOI: 10.1002/aenm.202300368
Yikai Jia _{1,

2} , Xiang Gao _{1,

2} , Lin Ma _{1,

2} , Jun Xu _{1,

2,

3}

Affiliation

Despite their wide applications, lithium-ion batteries (LIBs) have been struggling with their safety risks arising from different lifetime stages. Here, the NCMA pouch cell is taken as an example, and the safety of both fresh and aged cells from three milestone stages, that is, internal short circuit (ISC) triggering risk, ISC mode, and the subsequent thermal runaway (TR) consequence is investigated. By combining mechanical abusive testing and physics-based models on commercialized cells with various states-of-health (SOH) and states-of-charge, it is discovered that the ISC triggering delays with the decay of SOH and soft ISC mode will be triggered more frequently, which is mainly due to the mechanical behaviors of the current collectors. The temperature rises and peak temperature during the subsequent TR also become milder for aged cells due to the reduced capacity and deterministic soft ISC process. Results here provide a mechanistic explanation of the safety risk comparison between the fresh and aged cells, offering cornerstone guidance to the evaluation and design of next-generation safer LIBs.

中文翻译：

全面的电池安全风险评估：机械滥用负载下的老化电池与新鲜电池

尽管锂离子电池（LIB）有着广泛的应用，但它一直在努力应对不同生命阶段产生的安全风险。这里以NCMA软包电池为例，从内部短路（ISC）触发风险、ISC模式以及随后的热失控（TR）后果这三个里程碑阶段来分析新鲜电池和老化电池的安全性被调查。通过将机械滥用测试和基于物理的模型对具有各种健康状态（SOH）和充电状态的商业电池相结合，发现随着SOH和软ISC模式的衰减，ISC触发延迟将被触发更频繁，这主要是由于集电器的机械行为造成的。由于容量降低和确定性软ISC过程，老化电池在随后的TR期间的温度升高和峰值温度也变得更加温和。这里的结果提供了新鲜电池和老化电池之间安全风险比较的机械解释，为下一代更安全的锂离子电池的评估和设计提供了基石指导。

更新日期：2023-05-10

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11