Diaphragm pre-folding and stacking structure of composite lamination machine and stacking process of diaphragm pre-folding and stacking structure

Abstract

The invention discloses a composite lamination machine diaphragm pre-folding and stacking structure and a stacking process thereof.The composite lamination machine diaphragm pre-folding and stacking structure comprises an unwinding structure, a pre-folding assembly, a composite pole piece pasting assembly and a material receiving assembly, and the diaphragm unwinding structure is used for unwinding diaphragms among the pre-folding assembly, the composite pole piece pasting assembly and the material receiving assembly; the pre-folding assembly is used for hot-pressing pre-folding of the unwound diaphragm, the composite pole piece pasting assembly is used for bonding a pole piece on the diaphragm, and the material receiving assembly is used for automatic stacking and material receiving of the diaphragm. Before the battery cell diaphragms are stacked, the diaphragms are heated and pre-folded by adopting the pre-folding assembly, so that the diaphragms pasted with pole pieces can be automatically stacked in the material receiving assembly in a reciprocating manner. The heating pre-folding process not only simplifies the step of carrying out reciprocating type stacking on the lithium battery diaphragm, but also reduces manual operation, increases the accuracy and speed of cell stacking, and ensures the production quality and production efficiency of the lithium battery cell.

Description

technical field [0001] The invention relates to a lithium battery lamination method, in particular to a pre-folded stacking structure of a diaphragm of a composite lamination machine and a stacking process thereof. Background technique [0002] Lithium batteries are the most popular and important products for emergency energy storage and power vehicles. Improving battery safety, energy density, cycle times, and production efficiency are the development directions of lithium batteries. Most of the existing lithium battery cells are wound into cores, and some of them are laminated into cores; the wound cells have defects such as inconsistency between the pole pieces, easy to produce wrinkles, easy to analyze lithium, and low space utilization; Laminated sheets do not have these defects and have significant advantages. The factors that limit the large-scale application of laminated sheets are low production efficiency and complex production equipment. The traditional laminatio...

AI Technical Summary

Problems solved by technology

Most of the existing lithium battery cells are wound into cores, and some of them are laminated into cores; the wound cells have defects such as inconsistency between the pole pieces, easy to produce wrinkles, easy to analyze lithium, and low space utilization; Laminates do not have these defects and have significant advantages. The factors that limit the large-scale application of laminations are low production efficiency and complex production equipment.

The traditional lamination adopts alternately placing the positive and negative pole pieces into the Z-shaped interlayer of the diaphragm, and uses 4 pressing pieces to temporarily compress the laminated part alternately. This kind of lamination structure is the most existing lamination structure, and its existence speed is low. , and it is not suitable for large-sized batteries, and it is easy to damage the pole pieces and other shortcomings

Images