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The cell characterization in the incoming inspection is an important but time and cost intensive process step. In order to obtain reliable parameters to evaluate and classify the cells, it is essential to design the test procedures in such a way that the parameters derived from the data allow the required statements about the cells. Before the focus is placed on the evaluation of cell properties, it is therefore necessary to design the test procedures appropriately. In the scope of the investigations two differently designed incoming inspection routines were carried out on 230 commercial lithium-ion battery cells (LIBs) with the aim of deriving recommendations for optimal test procedures. The derived parameters of the test strategies were compared and statistically evaluated. Subsequently, key figures for the classification were identified. As a conclusion, the capacity was confirmed as an already known important parameter and the average cell voltage was identified as a possibility to replace the usually used internal resistance. With regard to capacity, the integration of CV steps in the discharging processes enables the determination independently from the C-rate. For the average voltage cycles with high C-rates are particularly meaningful because of the significant higher scattering due to the overvoltage parts.
Kerstin Ryll; Louisa Hoffmann; Oliver Landrath; Frank Lienesch; Michael Kurrat. Key Figure Based Incoming Inspection of Lithium-Ion Battery Cells. Batteries 2021, 7, 9 .
AMA StyleKerstin Ryll, Louisa Hoffmann, Oliver Landrath, Frank Lienesch, Michael Kurrat. Key Figure Based Incoming Inspection of Lithium-Ion Battery Cells. Batteries. 2021; 7 (1):9.
Chicago/Turabian StyleKerstin Ryll; Louisa Hoffmann; Oliver Landrath; Frank Lienesch; Michael Kurrat. 2021. "Key Figure Based Incoming Inspection of Lithium-Ion Battery Cells." Batteries 7, no. 1: 9.
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.
Tobias Jansen; Maja W. Kandula; Sven Hartwig; Louisa Hoffmann; Wolfgang Haselrieder; Klaus Dilger. Influence of Laser-Generated Cutting Edges on the Electrical Performance of Large Lithium-Ion Pouch Cells. Batteries 2019, 5, 73 .
AMA StyleTobias Jansen, Maja W. Kandula, Sven Hartwig, Louisa Hoffmann, Wolfgang Haselrieder, Klaus Dilger. Influence of Laser-Generated Cutting Edges on the Electrical Performance of Large Lithium-Ion Pouch Cells. Batteries. 2019; 5 (4):73.
Chicago/Turabian StyleTobias Jansen; Maja W. Kandula; Sven Hartwig; Louisa Hoffmann; Wolfgang Haselrieder; Klaus Dilger. 2019. "Influence of Laser-Generated Cutting Edges on the Electrical Performance of Large Lithium-Ion Pouch Cells." Batteries 5, no. 4: 73.
The rising relevance of automotive lithium‐ion battery cells spotlights the importance of the economic production in high quantity. In this context, production technology for large battery formats are of great relevance. Therefore, it is necessary to identify effects on important cell properties and based on this develop an understanding of interaction between process parameters and product properties. Large‐format cells, on the one hand, have not yet been comprehensively examined, especially not in large sample size analyzing cell properties in terms distributed values. Hence, there is so far no statistical data concerning large‐format batteries and their distributed discharge capacity and self‐discharge. For that reason and in contrast to other studies, the scope of this work is to investigate a large sample size of 79 industrial scaled 9 Ah battery cells in order to ensure statistical relevance as well as to generate distributed data of cell properties. For this purpose, a large number of cells were produced and extensively electrochemically investigated. Subsequently, the essential parameters are correlated with the electrode parameter of carbon black particle size. Hence, the foundation for this process‐product‐property‐relationship is laid.
Louisa Hoffmann; Jan-Kirsten Grathwol; Wolfgang Haselrieder; Ruben Leithoff; Tobias Jansen; Klaus Dilger; Klaus Dröder; Arno Kwade; Michael Kurrat. Capacity Distribution of Large Lithium‐Ion Battery Pouch Cells in Context with Pilot Production Processes. Energy Technology 2019, 8, 1 .
AMA StyleLouisa Hoffmann, Jan-Kirsten Grathwol, Wolfgang Haselrieder, Ruben Leithoff, Tobias Jansen, Klaus Dilger, Klaus Dröder, Arno Kwade, Michael Kurrat. Capacity Distribution of Large Lithium‐Ion Battery Pouch Cells in Context with Pilot Production Processes. Energy Technology. 2019; 8 (2):1.
Chicago/Turabian StyleLouisa Hoffmann; Jan-Kirsten Grathwol; Wolfgang Haselrieder; Ruben Leithoff; Tobias Jansen; Klaus Dilger; Klaus Dröder; Arno Kwade; Michael Kurrat. 2019. "Capacity Distribution of Large Lithium‐Ion Battery Pouch Cells in Context with Pilot Production Processes." Energy Technology 8, no. 2: 1.