Pouch Forming Structure for Wrinkle-Free Battery Corners

A core member is introduced as an intermediary element positioned between the support plate and the laminate sheet at the corner parts. This core member acts as a mediator that redistributes the pressing force, preventing direct concentration of stress at the corners during the shaping process, thereby eliminating wrinkle formation while maintaining the structural integrity of the receiving portion.

The support structure is modified by adding core members specifically at the corner parts where wrinkles occur, rather than uniformly across the entire support plate. This localized modification targets the specific problem area, providing enhanced support and force distribution exactly where needed, while keeping the rest of the system simple and cost-effective.

The complex control mechanism involving control members that move the stripper upwards is removed from the system. Instead, the wrinkle prevention function is achieved by extracting and isolating the essential support function to the core members positioned at the corners, allowing the stripper to operate independently without requiring coordinated upward movement control.

The core member serves as a passive intermediary that automatically provides the necessary support and force distribution without requiring active control mechanisms. This eliminates the need for control members and their associated complexity, as the core members inherently manage the stress distribution during the punching operation.