An Electromagnetic Acoustic Transducer for Generating Acoustic Waves in Lithium-Ion Pouch Cells

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Abstract

The need for monitoring Lithium-ion pouch cells is constantly increasing as the number of assembled cells in various applications grows. The State of Charge (SoC) and State of Health (SoH) are two important states to observe. A novel approach to estimating SoC is to monitor the mechanical properties of the battery as they change during the charge/discharge process. Hereby, an acoustic wave is generated inside the cell by a transmitter. After a certain Time of Flight (ToF), the propagating acoustic wave is detected by a receiver. The measured ToF between transmitter and receiver is an indicator for the SoC. For such a ToF measurement, it is preferable to excite only one single wave inside the battery, as this allows a clear detection of the wave and simplifies the ToF evaluation. In this paper an Electromagnetic Acoustic Transducer (EMAT) design is presented for an explicit generation of a defined wave mode inside the battery cell. The sole presence of the the defined generated mode inside the cell is demonstrated by means of acceleration measurements. The corresponding ToF is estimated by evaluating the cross-correlation result of the measured acceleration signal and the excitation signal.
Originalspracheenglisch
TitelI2MTC 2022 - IEEE International Instrumentation and Measurement Technology Conference
UntertitelInstrumentation and Measurement under Pandemic Constraints, Proceedings
Herausgeber (Verlag)ACM/IEEE
Seitenumfang6
ISBN (elektronisch)9781665483605
ISBN (Print)978-1-6654-8361-2
DOIs
PublikationsstatusVeröffentlicht - 19 Mai 2022
Veranstaltung2022 IEEE International Instrumentation and Measurement Technology Conference : I2MTC 2022 - Ottawa, Kanada
Dauer: 16 Mai 202219 Mai 2022

Konferenz

Konferenz2022 IEEE International Instrumentation and Measurement Technology Conference
KurztitelI2MTC 2022
Land/GebietKanada
OrtOttawa
Zeitraum16/05/2219/05/22

ASJC Scopus subject areas

  • Elektrotechnik und Elektronik

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