Laser ultrasonic inspection of wire welds in cylindrical lithium-ion battery pack

IF 5.6 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Measurement Pub Date : 2025-09-29 DOI:10.1016/j.measurement.2025.119166

Minwoo Kang , Kiyoon Yi , Hoon Sohn

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引用次数: 0

Abstract

As the demand for lithium-ion batteries continues to increase, quality control and safety assurance become increasingly critical in the battery manufacturing industry. This study presents a laser ultrasonic inspection technique to evaluate the quality of the welding between a wire and a busbar in a cylindrical lithium-ion battery pack. Ultrasonic waves are generated using a neodymium-doped yttrium aluminum garnet (Nd:YAG) laser at the wire, and the corresponding ultrasonic responses are measured at both the wire and busbar using a laser Doppler vibrometer (LDV). The proposed technique is based on the principle that inadequate welding leads to poor transmission of ultrasonic waves from the wire to the busbar. Based on this concept, an ultrasonic energy ratio is defined as the ratio of the ultrasonic wave energy measured at the wire to that measured at the busbar. Numerical simulations and experimental tests demonstrate a strong correlation (correlation coefficient R² = 0.8899) between the welding condition and the energy ratio. The proposed laser ultrasonic inspection technique enables non-contact and non-destructive evaluation of welds, offering potential for in-situ and in-line inspection of cylindrical lithium-ion-battery packs.

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圆柱形锂离子电池组焊丝焊缝的激光超声检测

随着锂离子电池需求的不断增加，电池制造行业的质量控制和安全保障变得越来越重要。本研究提出了一种用于评估圆柱形锂离子电池组中导线与母线之间焊接质量的激光超声检测技术。利用掺钕钇铝石榴石（Nd:YAG）激光器在导线处产生超声波，并利用激光多普勒振动仪（LDV）在导线和母线处测量相应的超声响应。所提出的技术是基于焊接不充分导致超声波从导线到母线传输不良的原理。基于这个概念，超声波能量比被定义为在导线处测得的超声波能量与在母线处测得的超声波能量之比。数值模拟和试验结果表明，焊接状态与能量比之间存在较强的相关关系（相关系数R2 = 0.8899）。提出的激光超声检测技术能够对焊缝进行非接触和非破坏性评估，为圆柱形锂离子电池组的原位和在线检测提供了潜力。

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来源期刊

Measurement 工程技术-工程：综合

CiteScore

10.20

自引率

12.50%

发文量

1589

审稿时长

12.1 months

期刊介绍： Contributions are invited on novel achievements in all fields of measurement and instrumentation science and technology. Authors are encouraged to submit novel material, whose ultimate goal is an advancement in the state of the art of: measurement and metrology fundamentals, sensors, measurement instruments, measurement and estimation techniques, measurement data processing and fusion algorithms, evaluation procedures and methodologies for plants and industrial processes, performance analysis of systems, processes and algorithms, mathematical models for measurement-oriented purposes, distributed measurement systems in a connected world.