Abstract
Laser cutting is a promising technology for the singulation of conventional and advanced electrodes for lithium-ion batteries. Even though the continuous development of laser sources, beam guiding, and handling systems enable industrial relevant high cycle times, there are still uncertainties regarding the influence of, for this process, typical cutting edge characteristics on the electrochemical performance. To investigate this issue, conventional anodes and cathodes were cut by a pulsed fiber laser with a central emission wavelength of 1059–1065 nm and a pulse duration of 240 ns. Based on investigations considering the pulse repetition frequency, cutting speed, and line energy, a cell setup of anodes and cathodes with different cutting edge characteristics were selected. The experiments on 9 Ah pouch cells demonstrated that the cutting edge of the cathode had a greater impact on the electrochemical performance than the cutting edge of the anode. Furthermore, the results pointed out that on the cathode side, the contamination through metal spatters, generated by the laser current collector interaction, had the largest impact on the electrochemical performance.
Highlights
Due to continuing human-induced CO2 emissions, the global warming of the earth and associated negative consequences of extreme weather are steadily increasing [1]
Cut surface by molten aluminum splashes are marked turquoise: turquoise: 1. Electrode. These results showed that fewer sparks formation led to less contamination of the electrode surface the area of the cutting edge.fiber
The influence of the laser parameters or the cutting showed surface only a exerted a greater influence on the electrochemical performance than the heat-affected zone and thea small influence on the examined variations
Summary
Due to continuing human-induced CO2 emissions, the global warming of the earth and associated negative consequences of extreme weather are steadily increasing [1]. Lithium-ion pouch cells are considered to be the most effective electrochemical technology Due to their advantages regarding the high volumetric utilization of the installation space of the battery. Improving the singulation process can contribute common in cell production lines due to its process-immanent advantages over the contact-based to accomplishing these high standards. 8588) [9], laserlithium cutting is becoming laser cutting is no longer an but state of the due to the lack of contact and increasingly common in alternative cell production lines duearttotechnology its process-immanent advantages overthethe associated lack of mechanical stress [11]. The interactions between the material and the laser-generated photons during the cutting process is very dynamic and very complex due to a large number of possible and partly mutually dependent influencing factors.
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