Ultrasound Method of Li-ion Electric Battery Monitoring

Gaponov, V.L.; Kuznetsov, Dmitry M.; Dudnik, Vitali; Afanasieva, Nadezda

doi:10.2991/aime-18.2018.28

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2020

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“…[10][11][12][13] Previous works are usually based on fixed-point ultrasonic testing, which cannot probe heterogeneity across an entire Li-ion cell. [14][15][16] These remarkable works demonstrated the feasibility of using ultrasound to study the internal state of lithium-ion cells. However, fixed-point testing only gives ultrasonic information…”

Section: Introductionmentioning

confidence: 96%

Ultrasonic Scanning to Observe Wetting and “Unwetting” in Li-Ion Pouch Cells

Deng

Huang

Shen

et al. 2020

Joule

232

151

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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.

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