It seems that investment in pouch type has also increased these days. The lamination/folding process and stacking expected today are quite closely related to this design. Today I will explain only the general contents and next I explain them in details more.
The Notched electrode undergoes a process of overlapping several cathodes/anodes. A separator is positioned between each electrode. Each electrode undergoes various processes in assembly, and the position and the direction in which the electrode is settled pass several steps, and tolerance accumulates, resulting in deformation in the assembled shape. Moreover, it is desired to speed up the facility in consideration of productivity, however in this case, the tolerance and deformation of the electrode become more severe, and thus the facility speed cannot be easily increased. Due to the characteristics of the Pouch, various sizes and stacked quantity may be desired in same facility, and in this case, the origin of the facility initially installed due to repeated dimensional adjustment is distorted, and various problems of final battery may occur due to the shape deformation. Therefore, unless you are an expert, please refrain from mixing the size of the product.
Lamination/folding is to create a structure in which several electrodes are overlapped and then turned into a separator. In this case, the key point of the laminated electrode is to match the supply speed of the electrode when each electrode is supplied and overlapped at the same time, and to match the center without being twisted left/right. The structure of this supply unit is quite unique, and each facility manufacturer has its own unique structure. The supplied electrode is pressed up/down to adhere, and various treatment methods should be attempted to ensure uniformity of adhesive force. In particular, if you attempt without knowing the physical properties of the separation membrane, so be careful using treatment process.
The thickness of folding increases as it goes to the last stage, so it is important to control the separator position as the electrode thickness increases. If this position control is not normal, the separators will overlap each other and the structure of the stacked electrodes will be distorted. Conversely, if a lot of tension is applied to the separator to prevent it from being loose, the separator may be damaged, resulting in safety issues. Because it is quite difficult to control the tolerance of thickness and the folding tolerance of electrodes, this folding method has been used as the exclusive property of some patented battery companies. In addition, since there is a limit to the amount of electrodes stacked, it is becoming a method that is not gradually used in the current high capacity trend. However, in other methods, this structure is simple and investment costs are reduced, so it is still an attractive method.
Next I'll explain Z-folding process continually.
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