Continuous shell punching is a key pre process in the production of soft pack lithium batteries, which refers to the process of using high-precision continuous molds and punching equipment to automatically punch rolled aluminum-plastic film composite materials into specific sized pits (i.e. "shells") that accommodate the battery cells at high speed. Its core purpose is to provide standardized containers for subsequent stacking or winding of battery cells.

The standard workflow mainly includes the following steps:

Feeding and positioning: The rolled aluminum-plastic film is installed on the feeding shaft, and the film material is uniformly pulled into the continuous stamping mold. Accurate positioning is achieved through photoelectric sensors or mechanical positioning holes (if available) to ensure the accuracy of each stamping position.

Continuous stamping forming: In a precision continuous mold, the first punching (usually punching wire holes) and second deep punching (stretching to form pits) are carried out at specific positions of the aluminum-plastic film through the clamping action of the upper and lower molds. The convex mold of the mold stretches the aluminum-plastic film to a predetermined depth, forming precise, undamaged, and excessively thin pits (i.e., cell cavities).

Material collection and dust removal: After stamping, the aluminum-plastic film strip (including a series of pits) is collected into rolls by a material collection reel or placed piece by piece by a robotic arm. During this process, there is usually an ion wind dust removal device to remove metal debris and particles generated by stamping, ensuring the cleanliness of the shell cavity and avoiding the risk of subsequent short circuits.

The core value of this process lies in achieving high efficiency, high consistency, and automated production of aluminum-plastic film shell forming. The precise depth and size of the pits provide stable space for the battery cells, avoiding internal looseness or tightness; The intact stamping quality (without cracking or severe thinning) is the fundamental prerequisite for ensuring the airtightness and safety of the final packaging of the battery.