石墨-磷酸铁锂软包电池循环过程中的应变演变与荷电状态估计

doi:10.19799/j.cnki.2095-4239.2024.0653

摘要/Abstract

摘要：

锂离子电池(LIBs)因其高能量密度、长寿命和低成本等优点，已广泛应用于储能领域。由于正负极在循环过程中发生周期性体积变化，电池产生应力和应变累积，而应变演变与电池的荷电状态(SOC)密切相关。因此，实时监测电池的应变变化对于电池的长期安全稳定运行至关重要。因此，本文采用光纤布拉格光栅(FBG)传感器对石墨-磷酸铁锂(AG||LFP)软包电池进行了应变监测。设计了光纤与电池及电极片的结合方式，原位监测了各电极以及电池整体的应变演化，并分析了软包电池中应力的成因。进一步地，基于应变量对AG||LFP软包电池的SOC进行了估计，展示了FBG传感器在电池荷电状态监测中的潜力。

关键词: 光纤检测, 超声成像, 应变演变, 电池状态估计

Abstract:

Lithium-ion batteries (LIBs) are widely used in energy storage due to their high energy density, long lifespan, and low cost. The intercalation and deintercalation of lithium ions in the positive and negative electrodes cause volume changes, accumulating stress and strain within the battery. These stress and strain are closely related to the battery's state of charge (SOC) and state of health. Therefore, real-time monitoring of the battery's strain changes is crucial for ensuring its long-term safety and stability during operation. In this study, Fiber Bragg Grating (FBG) sensors were used to monitor the strain of graphite-lithium iron phosphate (AG||LFP) pouch cells. A method was developed to integrate optical fibers with the battery and electrode sheets. This allowed for in situ monitoring of the strain development in each electrode and the entire battery, and the sources of stress in pouch cells were analyzed. Furthermore, using the strain data, the SOC of AG||LFP pouch cells was estimated, demonstrating the potential of FBG sensors in monitoring the battery charge levels.

Key words: optical fiber detection, ultrasound imaging, strain evolution, battery state estimation

中图分类号:

TQ 152

杜进桥, 张怡, 田杰, 黄锴, 沈越. 石墨-磷酸铁锂软包电池循环过程中的应变演变与荷电状态估计[J]. 储能科学与技术, 2025, 14(1): 310-318.

Jinqiao DU, Yi ZHANG, Jie TIAN, Kai HUANG, Yue SHEN. Strain evolution and state of charge estimation in graphite-lithium iron phosphate pouch cells during cycling[J]. Energy Storage Science and Technology, 2025, 14(1): 310-318.

图/表 7

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