Guided wave dispersion characteristics of multi-layered porous lithium-ion batteries and their application
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摘要: 采用状态矩阵与勒让德级数联合法, 同步联立Biot理论, 构建多层多孔锂离子电池声传播特性理论模型, 以厚1.9 mm软包钴酸锂电池为例, 数值分析了荷电状态(State of Charge, SOC)对多模态频散曲线的影响规律。同时, 建立了电池中的声传播特性频域仿真模型, 提取频域仿真中的超声导波频散曲线。此外, 以体积小、柔性强的压电纤维复合材料(Macro Fiber Composite, MFC)为基础, 实验探究了不同SOC对锂离子电池中声学行为的影响。采用互相关分析获取电池放电过程中声波渡越时间的偏移规律, 建立了1.9 mm软包钴酸锂电池的声学波动行为与电池SOC间的映射关系。Abstract: Based on the combination of state matrix and Legendre series method with Biot's theory, a theoretical model for wave propagation in multi-layered porous lithium-ion batteries is established. Taking 1.9 mm-thick soft-pack cobalt oxides lithium-ion battery as an example, the influence of State Of Charge (SOC) on the multi-mode dispersion curves is numerically analyzed. At the same time, a frequency-domain simulation model of the wave propagation characteristics of a multilayer porous lithium-ion battery is established, and the ultrasonic guided wave dispersion curves in frequency-domain simulation are extracted. In addition, based on Macro Fiber Composite (MFC) transducer which possesses small volume and strong flexibility, the influence of different states of charge on the acoustic behavior of lithium-ion batteries is explored experimentally. The cross-correlation analysis is used to obtain the shift in the time of flight during the discharging process. The mapping relationship between acoustic wave behavior and SOC of a 1.9 mm-thick soft-pack cobalt oxides lithium-ion battery is established.
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