Laser Micro Welding for Ribbon Bonding

Mehlmann, Benjamin; Gehlen, Elmar; Olowinsky, Alexander; Gillner, Arnold

doi:10.1016/j.phpro.2014.08.085

Cited by 22 publications

(12 citation statements)

References 2 publications

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“…The tests are carried out on the modified wire bonder described by [9] from F&K Delvotec Bondtechnik GmbH, Ottobrunn, Germany. This prototype system was developed in cooperation with the Fraunhofer Institute for Laser Technology, Aachen, Germany, as part of the RoBE project (Robust Joints for Electric Vehicles) funded by the Federal Ministry of Education and Research (BMBF).…”

Section: Laserbondermentioning

confidence: 99%

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Influence of the surface properties of the connector material on the reliable and reproducible contacting of battery cells with a laser beam welding process

et al. 2019

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The increasing electrification of the automotive industry leads to a growing demand for high-performance energy storage systems. Three different cell types are used for the construction and production of battery modules or packs. These include, for example 18650 round cells, prismatic cells or pouch cells. For the electrical interconnection of prismatic energy storage devices or round cells, the laser bonding method can be used as a particularly flexible connection technology. This method combines the technique of a conventional wire bonder with laser beam welding. Compared to wire bonding, wider and thicker connectors can be contacted, and thus higher currents can be transmitted. During the production of wires/ribbons for wire bonding, sometimes complicated and costly process steps are necessary in order to ensure a consistently high quality of the produced material and consequently obtain a reproducible wire bonding process. Unfortunately, a polished and hence highly reflective surface of an aluminium or copper ribbon adversely affects the reliability of the laser beam welding process. A rough or oxidised ribbon surface however can favour the coupling of the laser radiation into the copper material and thus contribute to a stable process sequence. In this work, the influence of the surface properties of pure copper ribbons regarding the process reliability is investigated. Therefore, ribbons produced for a wire bonding process are thermally oxidised or mechanically roughened, and their optical properties are compared with a polished reference material. The sample ribbons are welded with a continuous wave fibre laser, and the mechanical properties of the resulting connection are investigated. Due to a more stable interaction of the laser radiation, a mechanically and electrically improved connection is expected.

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Section: Laserbondermentioning

confidence: 99%

“…3D view of the modified wire bonder head of the laserbonder[9] Exemplary absorption coefficient of copper, aluminium and steel surfaces at room temperature over the wavelength[3] …”

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confidence: 99%

Influence of the surface properties of the connector material on the reliable and reproducible contacting of battery cells with a laser beam welding process

et al. 2019

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“…Examples can be found in all kind of technologies, reaching from welding of battery assemblies and electrical contacts via applications in telecommunication all the way to the use in components for satellites. For all applications, a high reproducibility and low energy input is necessary to avoid distortion or damage on connecting parts [1,2].…”

Section: Introductionmentioning

confidence: 99%

Seam Formation in Laser Beam Micro-Welding with Spatial Power Modulation

Aden

Heinen

Olowinsky

2021

Lasers Manuf. Mater. Process.

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When laser sources of high brilliance are used for the micro-welding of metals, small seam dimensions are generated. If the spatial power is modulated by a superposition of the linear feed rate and a circular-oscillatory movement of high frequency, the width of the seam is controlled by the amplitude of the circular movement. In this study, the irradiation pattern of the seam was calculated and reveals that some spots of the seam area are not irradiated, while other have been irradiated several times. The seam shapes were visualized with micro cross-sections for different laser powers, linear feed rates and oscillatory amplitudes. Thermal simulations were made to discuss the different seam shapes. A consequence of the oscillatory movement is the appearance of different solidification fronts, which are visible in the micro cross-sections.

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“…Welding in general serves as an excellent alternative here especially since certain forms of it are highly automatable as well [4,5]. Laser (and sometimes ultrasonic) welding is a particularly preferred option for solving battery joining problems in the automotive industry [5,6,7]. This convention stems from the highly versatile nature of laser welding.…”

Section: Introductionmentioning

confidence: 99%