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During the production and use of lithium-ion batteries, there is a certain probability of safety failures and performance failures, such as wrinkling, gas generation, poor infiltration, lithium deposition, and extrusion damage. Battery failure may not only lead to a significant decline in the overall performance of the battery, but also pose greater safety risks such as explosion. Therefore, the detection and assessment of the health status of lithium-ion batteries is an important part of battery management. The resonant ultrasound spectroscopy (RUS) technique can achieve accurate testing of the frequency distribution of weakly transmitted or reflected waves. So, this technique can be used to detect and evaluate the internal state of lithium batteries.

Patent: A Device and Method for Detecting Lithium Batteries Based on Ultrasonic Resonance Spectrum, Tang Liguo, Wang Shujia, Wang Shaofei, Zang Jiahe