Strain evolution and state of charge estimation in graphite-lithium iron phosphate pouch cells during cycling

doi:10.19799/j.cnki.2095-4239.2024.0653

Abstract

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

CLC Number:

TQ 152

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.

Figures/Tables 7

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