A method and device for preparing perforated current collector foil based on dislocation texture rolling

Abstract

The invention discloses a method and device for preparing a perforated current collector foil based on dislocation texturing rolling. The steps of the preparation method include: firstly, respectively mounting two rolls on a numerically controlled lathe, and processing ring-shaped protrusions on the surface of the rolls; A good pair of rolls is assembled on the rolling mill, so that the annular protrusions on the surface of the two rolls are staggered from each other, and then the foil is passed through the gap between the two rolls, and the rolling force is applied to form impermeable pits on the upper and lower surfaces of the foil The surface texture structure is formed; the laser drilling module is installed at the exit of the rolling mill, and the translation mechanism of the laser drilling module is used to drive the scanning head to move along the direction of the vertical foil movement. During the movement, the scanning head scans along the movement direction of the foil , forming a scanning band, and performing laser drilling on the foil, and finally obtaining a surface roughened and perforated current collector foil. The double-sided pits of the perforated base foil rolled by the invention do not overlap with each other, and the surface morphology is formed by dislocation extrusion of the protrusions on the surface of the roll, and has good mechanical properties and high surface roughness.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a preparation method and device for a roughened and perforated current collector foil based on dislocation rolling. Background technique [0002] In electrochemical energy storage devices, the surface of the current collector foil is coated with active materials to form a pole piece, and the foil plays the role of carrying active materials and transporting electrons. The surface roughening of the foil can increase the specific surface area and improve the adhesion between the active layer and the foil. The through holes on the surface of the foil can connect the active layer coated on both sides, which can not only improve the adhesion performance between the active layer and the current collector to a certain extent, but also promote the infiltration of the electrolyte, balance the lithium ion concentration on both sides of the pole piece and pre-embedded lithium. ...

AI Technical Summary

Problems solved by technology

However, each method has the following problems: the hole diameter prepared by the punching method is usually above 300 μm, and there are burrs on the surface of the foil. If the size of the punching hole is further reduced, there will be problems in the strength of the punch and the convex needle; the etching method is complicated. The cost of large-scale production is high; the laser drilling method either uses a combination of fixed laser points and guide rails to drill holes, or uses a scanner to drill holes. The drilling with moving guide rails needs to solve the problem of efficiency, while the processing format and aperture of scanning drilling cannot be independent. set up

[0005] On the whole, the existing current collector foil surface texture rolling method and perforation method have defects, and there is no effective integrated surface texture and perforation method and device, which cannot meet the requirements of electrochemical energy storage devices.

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