Analysis of the thermo-mechanical mechanism during ultrasonic welding of battery tabs using high-speed image capturing
Analysis of the thermo-mechanical mechanism during ultrasonic welding of battery tabs using high-speed image capturing
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DOI：
10.1007/s40194-019-00788-z
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发表时间：
2019-09
影响因子：
2.1
通讯作者：
I. Balz;E. Rosenthal;A. Reimer;M. Turiaux;A. Schiebahn;U. Reisgen
中科院分区：
文献类型：
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作者：
I. Balz;E. Rosenthal;A. Reimer;M. Turiaux;A. Schiebahn;U. Reisgen
超声波金属焊接 (USMW) 已被证明是一种适用于连接电池等电子元件的技术。然而，尽管USMW工艺得到广泛应用，但其质量波动仍然很大。波动很大程度上源于缺乏深厚的科学知识以及对工具和加入成员之间相互依赖性的理解。因此，本文旨在通过使用高速图像捕获来研究USMW过程的原位振荡行为。记录的图像序列通过两帧运动 Gunnar Farnebäck 算法进行分析。获得二维矢量场，从中可以计算工具和连接构件之间的位移和相对运动。设置不同的焊接参数和金属合金（AW-1050A、CW-008A）来研究它们对焊接顺序的影响。微观结构研究和 T 型剥离拉伸测试用于验证高速观察结果。根据测量的振幅曲线，USMW 可分为六个特征焊接阶段。此外，测量结果说明了粘合形成对焊接参数、特别是焊接材料的依赖性。研究结果使人们对 USMW 期间的热机械机制有了更深刻的理解，并将在质量和工艺稳定性方面带来前瞻性的改进。
Ultrasonic metal welding (USMW) has proven to be a suitable technique for joining electronic components such as battery cells. However, despite its widespread application, the USMW process still suffers from considerable quality fluctuations. The fluctuations largely originate in the lack of profound scientific knowledge and understanding of the interdependency between the tools and joining members. Therefore, this paper aims to investigate the in-situ oscillation behavior of the USMW process by using a high-speed image capturing. The recorded image-sequences are analyzed by a two-frame motion Gunnar Farnebäck algorithm. A two-dimensional vector field is obtained from which the displacement and relative movement between the tools and the joining members can be computed. Different welding parameters and metal alloys (AW-1050A, CW-008A) are set to study their effects on welding sequence. Microstructural investigations and T-peel tensile testing are used to validate the high-speed observations. Based on the measured amplitude profiles, USMW can be divided into six characteristic welding stages. Additionally, the measurements illustrate the dependence of the bond formation on the welding parameters and in particular on the welded materials. The results provide a more profound understanding of the thermo-mechanical mechanism during USMW and will introduce a prospective improvement in quality and process stability.