摘要
Abstract
Under the backdrop of the rapid development of the new energy vehicle industry,the safety of lithium-ion power batteries,as the core component of electric vehicles,has drawn increasing attention,espe-cially the frequent battery self-ignition incidents in recent years,which not only pose a threat to users′ lives and property but also intensify public concerns over the reliability of power batteries.By focusing on the efficiency changes and internal resistance evolution during battery charging and discharging,a new method for evaluating the aging state of batteries based on multi-parameter comprehensive analysis was proposed.This method can not only monitor the energy conversion efficiency of batteries during the charging and discharging cycles but also be used to study the changing trend of internal resistance over time and the mutual influence between internal re-sistance and key factors such as temperature and state of charge.On this basis,through experimental means,thermal imaging cameras,temperature sensors and other monitoring equipment were used to record the tempera-ture changes inside and on the surface of the battery in real time,further exploring the thermal runaway behavior of lithium-ion batteries under overcharging,overheating,and electrothermal coupling conditions,revealing the influence mechanism of aging on the thermal stability of batteries.The research results provide a new method for accurately assessing the aging state of power batteries,which can not only improve the accuracy of battery health management,life prediction and performance optimization,but also provide theoretical basis and technical sup-port for enhancing the overall safety of new energy vehicles.关键词
新能源/锂离子动力电池/电池管理系统算法/老化状态评估/内阻/热失控Key words
new energy/lithium-ion power battery/battery management system algorithm/aging status as-sessment/internal resistance/thermal runaway分类
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