Perforated current collector foil preparation method and device based on staggered texturing rolling

Abstract

The invention discloses a perforated current collector foil preparation method and device based on staggered texturing rolling. The preparation method comprises the steps that firstly, two rollers are respectively erected on a numerical control lathe, and annular protrusions are machined on the surfaces of the rollers; the manufactured roller pairs are assembled on a rolling mill, the annular protrusions on the surfaces of the two rollers are made to be staggered, then foil penetrates through the gap between the two rollers, and rolling force is applied to the upper surface and the lower surface of the foil to form a surface-textured structure formed by non-penetrating pits; and a laser drilling module is installed at an outlet of the rolling mill, a scanning head is driven by a translation mechanism of the laser drilling module to move in the direction perpendicular to the movement direction of the foil, in the moving process, the scanning head scans in the movement direction of the foil to form a scanning belt, laser drilling is conducted on the foil, and finally the surface-textured and perforated current collector foil is obtained. The double-sided pits of the perforated base foil rolled through the method and the device are not overlapped, the surface appearance is formed under the staggered extrusion action of the protrusions on the surfaces of the rollers, and good mechanical performance and high surface roughness are achieved.

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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