What is the reason why the overwinding of laminated diaphragm affects the edge collapse of diaphragm?

Incoming materials are abnormal, turnover is abnormal, and the outside of the battery cell is squeezed. According to the query, I know the network display.

1. The incoming material of the diaphragm is abnormal, and the edge of the diaphragm is curved.

2. Abnormal winding or overturning in the process will lead to damage or deformation of the diaphragm edge.

3. The appearance of the battery cell is deformed due to the extrusion or impact outside the battery cell, which in turn leads to the deformation of the diaphragm inside the battery cell.