new blog

Lithium ion Pouch Cell Case Sealing Process

Oct 11 , 2021

After the aluminum laminating film is formed and cut into shape, it is generally called Pocket, as shown in the following figure. In general, when the battery cells is thin, select a single pit (left below), and when the battery cells is thick, select a double pit (right below). Besause when the deformation of aluminum laminate film is too large, it will break through the deformation limit of aluminum laminate film. Sometimes a pit is punched as a gasbag. The gasbag can be increased according to the need. The gasbag is mainly used to collect the gas in the process of formation. Put the battery cells into the pit and fold it in half along the yellow line above.

Put the pouch cell into the battery top and side sealing machine for top sealing and side sealing. Put the pouch cell into the top and side sealing machine for top sealing and side sealing.
The temperature of the sealing head is generally about 180℃, and the PP layer of the aluminum laminate film is melted and bonded together. The top sealing area is shown in the figure below.

The top sealing is intended to seal the battery tabs which can melt and bond when heated. When sealing, PP in battery tabs adhesive and PP layer of aluminum laminate film melt and bond, forming an effective sealing structure.

TOB-SFZ-200 Battery heat sealing machine is a compact heating sealer for sealing aluminum-laminated films during pouch cell (polymer Li-Ion cell) case preparation. The sealing is copper in bottom and aluminum and silicone rubber piece on top. So it can be used for both top and side sealing for pouch cell.

TOB-BFZ-340 Battery Secondary Vacuum Heat Sealing Machine is mainly used for pouch cell vacuuming and secondary sealing after electrolyte filling.