Tang Dongxia, Xu Chenguang, Xu Guidong, Cui Sen, Zhang Sai
Institute of Ultrasonic Testing, Jiangsu University, Zhenjiang 212013, China.
Sensors (Basel). 2025 Mar 25;25(7):2033. doi: 10.3390/s25072033.
Non-contact laser ultrasonic detection technology provides an innovative solution for evaluating the internal conditions of lithium-ion batteries (LIBs), offering significant advantages in gas defect assessment and structural defect identification. This study proposes a method for evaluating internal gas defects in LIBs based on a non-contact laser ultrasonic system. The system uses a pulsed laser to generate ultrasonic waves, with a full-optical probe receiving the signals, enabling high-resolution imaging of the internal features of the battery. The study analyzes key ultrasonic characteristics under different laser parameters (energy, pulse width, and focal length) and their correlation with defective regions. Through both time-domain and frequency-domain analysis of the ultrasonic features, the results demonstrate that the signal amplitude attenuation characteristics of ultrasound in media with acoustic impedance mismatches can be used for precise detection and quantitative characterization of gas defect regions within the battery. This non-contact technology offers a promising method for real-time, non-destructive monitoring of the internal condition of lithium-ion batteries, significantly enhancing battery safety and reliability.
非接触式激光超声检测技术为评估锂离子电池（LIBs）的内部状况提供了一种创新解决方案，在气体缺陷评估和结构缺陷识别方面具有显著优势。本研究提出了一种基于非接触式激光超声系统评估锂离子电池内部气体缺陷的方法。该系统使用脉冲激光产生超声波，全光学探头接收信号，能够对电池内部特征进行高分辨率成像。研究分析了不同激光参数（能量、脉冲宽度和焦距）下的关键超声特性及其与缺陷区域的相关性。通过对超声特征的时域和频域分析，结果表明，声阻抗不匹配介质中超声的信号幅度衰减特性可用于精确检测和定量表征电池内的气体缺陷区域。这种非接触技术为锂离子电池内部状况的实时、无损监测提供了一种有前景的方法，显著提高了电池的安全性和可靠性。
