An ultrasonic imaging technique has been developed to investigate the internal changes of pouch cells nondestructively. The local ultrasonic transmittance of pouch cells has been measured and used for imaging with a new ultrasonic scanning machine designed and built in-house. The wetting process of the cells is clearly observed via such ultrasonic imaging techniques. Furthermore, ultrasonic transmission images of fresh cells and aged cells with different electrolytes and cycling conditions exhibit very different ultrasonic transmittance, which can be caused by electrolyte dry-out or “unwetting” due to cell swelling. The ultrasonic imaging technique is a very sensitive method to probe failure mechanisms in Li-ion pouch cells.

已经开发了超声成像技术以无损地研究袋细胞的内部变化。袋状细胞的局部超声透射率已通过内部设计和建造的新型超声扫描仪进行了测量并用于成像。通过这种超声成像技术可以清楚地观察到细胞的润湿过程。此外，具有不同电解质和循环条件的新鲜细胞和老化细胞的超声透射图像显示出非常不同的超声透射率，这可能是由于细胞肿胀导致电解质变干或“不润湿”所致。超声成像技术是一种非常敏感的方法，可用于探测锂离子袋式电池的失效机理。