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There are three important types of processing techniques for square power lithium-ion battery cells. One is the winding process, which is generally applied to the processing of cylindrical batteries. Currently, it is also applied to the processing of square batteries. The important advantage of this process is high processing efficiency, which can achieve continuous processing. The disadvantages are also obvious. Due to the large bending angle at the edge of the cell, electrode breakage and defects are prone to occur, Especially in the case of thick electrodes, this problem will become even more serious;

The second type is the lamination process, which is an ideal process. The positive and negative electrode plates are first punched to obtain a specific shape of the electrode plate, and then the positive or negative electrode plate is selected to be made into a sealing bag with a diaphragm for protection. Then, manual or laminating machine is used for lamination. The advantage of this process is that it does not cause deformation of the electrode plate, and thicker electrodes can be used. However, due to the non continuous process of lamination, Therefore, the processing efficiency of the lamination process is relatively low, and there are relatively few manufacturers using this process;

The third type is the Z-type lamination process, which uses a continuous diaphragm and places the punched positive and negative electrode plates in the middle of the diaphragm. While retaining the advantages of the lamination process, this process also accelerates the processing process and improves processing efficiency. Currently, it has many applications.

The first step for a processed battery cell is to weld the electrode ears. The important welding method for the electrode ears is to use ultrasonic welding technology. For cells processed using the winding process, due to the limitations of the cell structure, a single cell cannot be made very thick. Therefore, 2-4 cells are usually welded in parallel with the electrode ears. The battery structure processed by the lamination process is not limited, so the electrode ears are generally welded to a single cell. The next step is the process of entering the shell. After the outer surface of the cell welded with the lug is wrapped with a protective film, it is put into the battery shell. After entering the shell, the lug and the positive and negative pole posts on the cover of the battery shell are connected together by ultrasonic welding, riveting and other processes, and then the upper cover and the shell of the battery are welded together by laser welding.

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