Manufacturing method for electrode sheet cutting, electrode sheet using the same, and secondary battery using the same

Abstract

The present invention provides a manufacturing method for electrode sheet cutting, an electrode sheet using the manufacturing method, and a secondary battery using the manufacturing method. The manufacturing method comprises the following steps that: (1) one end of an electrode sheet substrate is provided with an electrode lug reservation position for cutting to form a plurality of electrode lugs, the other end of the electrode sheet substrate is provided with a material coating area, the electrode lug reservation position is provided with a starting position, a cutting tool is adopted to carry out cutting from the starting position; (2) the cutting tool cuts along the cutting line, and finally returns to the starting position to form the electrode sheet with the electrode lugs; (3) the cut electrode sheet is separated. The method of present invention has the following advantages that: the cutting treatment is started from the electrode lug reservation position, such that the burr generating or the tearing mark generating on the edge of the material coating area is avoided so as to prevent the isolation membrane from perforation or puncture, therefore, the use performance and the service life of the battery are enhanced.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a manufacturing method for pole piece cutting and pole pieces and secondary batteries using the manufacturing method. Background technique [0002] Secondary batteries, especially the pole pieces of lithium-ion batteries, are generally made by mixing electrochemically active substances, conductive agents, adhesives, diluents and other materials into a slurry, and then ink-jet, extrusion, printing transfer, etc. Coating the slurry on the electrode substrate material (such as aluminum foil, copper foil), after the baking step to solidify the coated slurry, and then through the rolling step to compact the coated slurry material, and finally the electrode The sheet is cut according to the size of the electrode sheet required for making the battery. [0003] Lithium-ion batteries with a laminated structure are stacked in the form of positive pole pieces, separators, and negative pole pieces....

AI Technical Summary

Problems solved by technology

However, the position of the lower knife during cutting is also the position where the knife is retracted, which is likely to cause tearing marks such as burrs. Although the probability of this phenomenon can be reduced by improving equipment and knives, the effect is limited and cannot be completely avoided. Battery performance is affected, especially in the coating area of ​​positive and negative electrode materials

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