TRUMPF Laser & Systemtechnik GmbH is a company offering a wide product portfolio of laser sources, addressing solutions for many industries such as mobility, aerospace, consumer electronics, energy, and data storage. Pulsed short-ns-, ps- and fs- laser sources are interesting for material surface engineering. Surface modification has seen many applications in the recent past, especially for applications such as cleaning or surface preparation prior to welding, gluing, or bonding. In addition, laser surface texturing can create hydrophile or hydrophobic surfaces.
However, heat and radiation management of components, in particular where cooling by heat exchange is not possible or less effective, using advanced surface texturing has yet to be explored. For example, vacuum grade microelectronics components might benefit from radiative passive cooling in space environment.
In this paper we present results using a ns-laser laser source for surface structuring of metals to enhance attenuation of light and thermal emissivity conductivity. Measurements of emissivity, attenuation will be presented and compared to commercially available surface treatments.
E-mobility is currently one of the fastest growing industries. Electric powered vehicles are driving emission free transportation and will consequently replace conventional combustion engine vehicles. The battery industry is a key enabler of the e-mobility sector, laser processing of battery materials has emerged as a promising processing tool for improving manufacturing flexibility and product reliability at a high throughput. The processing of cathode and anode battery foils is an example where laser cutting has reached a high level of maturity and is widely implemented in production lines. The industrial cutting requirements are quite varied based on design and battery chemistry. The challenges are to achieve the highest edge quality at the highest processing speeds. Cutting with cw-lasers often leads to a large heat affected zone, particularly for coated foils, whereas pulsed lasers can typically cut with superior quality. While most foils can be cut with adequate quality with optimized nanosecond lasers, some material combinations benefit from shorter pulses in the ultra-short pulse regime. This contribution gives a general overview about different challenges in battery foil cutting, as well as a comparison between different laser parameters like pulse duration and pulse energy levels. The influence of laser parameters, spot size and working field are discussed as well as the impact of cutting strategy (e.g. single-pass vs. multi-pass).
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