Measuring effective stiffness of Li-ion batteries via acoustic signal processing
Measuring effective stiffness of Li-ion batteries via acoustic signal processing
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DOI：
10.1039/d0ta05552b
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发表时间：
2020-08-28
影响因子：
11.9
通讯作者：
Steingart, Daniel
中科院分区：
文献类型：
--
作者：
Chang, Wesley;Mohr, Robert;Steingart, Daniel
在这项工作中，我们建立在声学电化学的相关性，研究声波结构和化学机械性能的袋状电池之间的关系。平行进行软包电池循环期间的电池厚度成像和波检测。改进的声学硬件和信号处理用于验证材料刚度的直接测量，这是一种固有的物理特性。在温度和压力受控的声学装置中，将单元厚度测量到微米分辨率和将波传输时间测量到纳秒分辨率允许估计有效刚度。我们进一步探讨了材料类型和电池分层对声学信号的影响，证明了操作声学方法可以准确地测量具有高动态时间和空间范围的电池的物理状态性质的变化。
In this work we build upon acoustic-electrochemical correlations to investigate the relationships between sound wave structure and chemo-mechanical properties of a pouch cell battery. Cell thickness imaging and wave detection during pouch cell cycling are conducted in parallel. Improved acoustic hardware and signal processing are used to validate the direct measurement of material stiffness, which is an intrinsic physical property. Measurement of cell thickness to micron resolution and wave transmit time to nanosecond resolution in a temperature and pressure controlled acoustic rig allows for estimation of the effective stiffness. We further explore the effects of material type and cell layering on the acoustic signal, demonstrating that theoperandoacoustic method can accurately measure the changes in physical state properties of a battery with high dynamic temporal and spatial range.