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电池能量和功率是整车性能的关键指标,准确的评估二者与老化状态的关系对整车全生命周期的控制至关重要。以三元方壳锂离子电池为研究对象,开展循环实验,并进行全生命周期的电化学性能表征,包括容量能量、混合脉冲功率特性(HPPC)、最大脉冲功率,分析电池老化衰减状态与内部机理的关系。实验结果表明:随着循环老化,电池正极溶出Ni、Mn元素,副反应加剧,负极固体电解质界面(SEI)膜明显增厚。老化主要来自负极活性物质的损失以及活性锂损失,功率和能量的衰减与容量、内阻倒数的衰减相关性极强,分别呈一次和二次函数关系。
Abstract:Battery energy and power are key indicators of vehicle performance, and accurate evaluation of the relationship between aging state and energy/power is crucial for managing the vehicle's entire lifecycle. In this paper, an NCM prismatic lithium-ion battery was subjected to cycling and electrochemical performance tests, including capacity, energy, Hybrid Pulse Power Characterization (HPPC), and maximum pulse power measurements. The test results show that as the battery ages, Ni and Mn dissolve from the positive electrode, side reactions intensify, and the SEI film thickens significantly. The degradation primarily stems from loss of active material (LAM) in the anode and loss of lithium inventory (LLI). Furthermore, the power and energy characteristics observable during aging correlate strongly with capacity fade and the increase in internal resistance. Specifically, these relationships follow distinct linear and quadratic functions.
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基本信息:
中图分类号:TM912
引用信息:
[1]杨慧敏,吕国霞,朱阳阳,等.方壳锂离子电池能量与功率衰减特性研究[J].电池工业().
2026-04-09
2026-04-09
2026-04-09