Lithium Battery Basics A polymer battery refers to a lithium-ion battery that uses polymer as the electrolyte. Specifically, it is further divided into two types: “semi-polymer” and “full-polymer”. The “semi-polymer” type means coating a layer of polymer (usually PVDF) on the separator, which makes the bonding force of the cell stronger and the battery can be made harder. Its electrolyte is still liquid electrolyte. The “full-polymer” type refers to using polymer to form a gel network inside the cell, and then injecting electrolyte to form the electrolyte. Although the “full-polymer” battery still needs to use liquid electrolyte, the amount is much less, which greatly improves the safety performance of the lithium-ion battery. As far as the author knows, currently only SONY is mass-producing “full-polymer” lithium-ion batteries. From another perspective, a polymer battery refers to a lithium-ion battery that uses an aluminum-plastic packaging film as the outer packaging, also comm...
Winding Process 1. Principle and Process Principle: The winding process involves the use of a fixed winding needle to wind and compress the pre-processed anode sheets, separator, and cathode sheets in sequence to form a cylindrical or elliptical shape. Process: The raw materials are stacked in the sequence of anode, separator, cathode, separator. Then, they are wound into cylindrical or elliptical shapes and placed into metal casings, either square or cylindrical. Specific steps include the unwinding of the anode and cathode sheets and separators, automatic alignment, automatic tension detection and control. The anode and cathode sheets are fed into the winding section by a clamp feeding mechanism, which, together with the separator , undergoes automatic winding according to specified process requirements. After the winding is completed, the machine automatically switches workstations, cuts the separator, attaches the end seal tape, and the finished bare cell is automatically dis...