Application Cases

Experiment Name: Battery Ultrasonic Guided Wave Scanning Experimental System Construction and Experimental Plan

Research Directions:
Construction of ultrasonic guided wave scanning experimental system for lithium-ion batteries, design and validation of surface scanning experimental plan for battery ultrasonic guided waves, design and validation of line scanning experimental plan for battery ultrasonic guided waves.

Experimental Objectives:
Based on clarifying the propagation characteristics of ultrasonic guided waves in batteries, establish a "contact excitation-non-contact reception" ultrasonic guided wave scanning experimental system. Design and validate the surface scanning and line scanning experimental plans, ultimately providing a stable experimental system, reliable detection methods, and effective dynamic guided wave data for subsequent battery SOC/SOH characterization and failure analysis.

Testing Equipment:
Ultrasonic signal generator (DG1022Z), power amplifier (Aigtek ATA-2021H), piezoelectric ceramic wafer, laser Doppler vibrometer (LV-S01), mobile displacement platform (THYK-1), battery, oscilloscope (MSO5104), PC, battery tester, data acquisition card.

Experimental Process:
First, an ultrasonic guided wave scanning experimental system with "contact excitation-non-contact reception" was constructed. The excitation module integrated a signal generator, power amplifier, and piezoelectric ceramic wafer, while the non-contact reception module utilized a laser Doppler vibrometer. This system, combined with a displacement platform and LabVIEW program, enabled automatic scanning and data storage in TDMS format. Subsequently, surface scanning experiments were conducted by fixing a lithium iron phosphate pouch battery on a displacement platform cushioned with sound-absorbing foam. A 25kHz Hanning-windowed five-cycle sinusoidal signal was used as the excitation to collect scanning signals at 50×51 points, forming a three-dimensional wave field matrix. Analysis of instantaneous wave field images and energy spectra verified the propagation characteristics of guided waves, including distance attenuation and boundary reflection. Finally, line scanning experiments were performed by fixing the piezoelectric wafer at the geometric center of the battery and selecting a straight line with 150 points as the scanning path. The battery tester collected line signals every 6 minutes, and the signal amplitude was square-root processed to validate the uniform propagation characteristics of guided waves at fixed SOC levels and the influence of SOC on guided wave propagation.

Figure 1: Ultrasonic Guided Wave Scanning Experimental System for Lithium-Ion Batteries

Figure 2: Experimental Platform of Ultrasonic Signal Scanning System

Experimental Results:

1. Successfully established a closed-loop ultrasonic guided wave scanning system with "contact excitation-non-contact reception." All modules operated stably and collaboratively, enabling timed multi-position signal acquisition on the battery surface and data storage in TDMS format.

2. The surface scanning experiments obtained a three-dimensional wave field matrix, verifying that the guided waves conformed to the propagation laws of plate Lamb waves. The energy spectra effectively reflected their propagation behavior.

3. The line scanning experiments confirmed the uniform propagation of guided waves at fixed SOC levels, mitigated asymmetric boundary reflections, and demonstrated the influence of SOC changes on guided wave propagation characteristics.

   
   

Figure 3: Instantaneous Wave Field Images of Ultrasonic Guided Waves at Different Times

Product Recommendation: ATA-2021B High-Voltage Amplifier

Figure: ATA-2021B High-Voltage Amplifier Specifications

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