Composite current collector seam welding die-cutting integrated equipment and seam welding die-cutting method

Abstract

The invention discloses a composite current collector roll welding die-cutting integrated equipment and a roll welding die-cutting method. Coil conveying mechanism, which is sequentially arranged on the upper layer foil unwinding conveying mechanism, composite current collector sheet layer unwinding conveying mechanism and the butt auxiliary roller at the rear end of the lower foil unwinding conveying mechanism, constant tension buffer roller and die-cutting drive variable speed roller , and rolling welding device, tab die-cutting device and cutting device; the rolling welding device is set between the butt auxiliary roller and the constant tension buffer roll, the tab die-cutting device is set at the rear end of the die-cutting drive speed change roller, and the tab die A cutting variable-speed conveying roller is arranged between the cutting device and the cutting device. The invention realizes welding, die-cutting and split cutting of the blank edge of the composite current collector during the transmission process of the composite current collector, reduces the damage rate of the composite current collector, and greatly improves the efficiency of roll welding and die-cutting of the composite current collector.

Description

technical field [0001] The invention relates to the field of manufacturing lithium battery cells, in particular to an integrated equipment for seam welding and die-cutting of composite current collectors and a method for seam welding and die-cutting. Background technique [0002] The market and policy have higher and higher energy density requirements for lithium-ion batteries, and the safety performance of batteries has become increasingly prominent. Therefore, the application of composite current collectors with lower surface density and superior safety performance is imperative. The composite current collector is composed of a polymer layer in the middle and metal coatings on both sides. Since the polymer layer is non-conductive, the two sides of the polymer layer cannot be conducted. It is necessary to weld the metal foil on both sides of the composite current collector first. Tabs as composite current collectors. At the same time, in order to reduce the possibility of ...

AI Technical Summary

Problems solved by technology

The existing composite current collector welding, lug die-cutting and split cutting are all carried out separately, and the workpiece needs to be transported and circulated between multiple stations. During the transportation and circulation process, it is very easy to cause damage to the composite current collector electrode piece, and Greatly reduces the manufacturing efficiency of lithium battery cells

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