CN-122025522-A - Device and method for continuously preparing three-dimensional porous copper foil

CN122025522ACN 122025522 ACN122025522 ACN 122025522ACN-122025522-A

Abstract

The application provides a device and a method for continuously preparing a three-dimensional porous copper foil, which are characterized in that an annular porous template is formed into a transmission closed loop with tension based on a driving substrate and a template guide roller unit on the basis of a copper foil roll-to-roll production structure, a copper foil substrate is continuously conveyed between the annular porous template and the driving substrate through the copper foil multi-stage guide roller unit, the copper foil substrate and the annular porous template are tightly attached due to the tension effect of the annular porous template, etching liquid is sprayed on the surface of the attached annular porous template, and only the through holes on the surface of the annular porous template flow to the etching side of the copper foil substrate for etching, the attachment and separation of the annular porous template and the copper foil substrate can be controlled through the guide effect of the template guide roller unit and the copper foil multi-stage guide roller unit, and the transmission direction of the copper foil substrate is adjusted, so that the etching liquid is separated from the surface of the copper foil substrate under the gravity effect, the large-scale continuous preparation of the three-dimensional porous copper foil can be realized, and the industrial production requirement is met.

Inventors

GAO SHIKAI
QIN TONG
WAN HANG
QIN ZHANLING
Tian Langyuan
ZHOU JIAXUAN
Duan Zhengcong
HAN XUELING
YANG JIANHUA
Chang Pengjie
WEI JIE

Assignees

西安航天新能源装备科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260318

Claims (10)

1. The device for continuously preparing the three-dimensional porous copper foil is characterized by comprising an unreeling unit (1) and a reeling unit (14), and an etching groove (5) and a post-treatment unit which are sequentially arranged between the unreeling unit (1) and the reeling unit (14), wherein the unreeling unit (1) is used for providing a copper foil substrate (2), and the reeling unit (14) is used for collecting the three-dimensional porous copper foil (13) formed by processing; The etching tank (5) is internally provided with a circulating rolling attaching unit, an etching liquid spraying device (8) and a copper foil multistage guide roller unit, the circulating rolling attaching unit comprises a driving substrate (6), an annular porous template (7) and a template guide roller unit, the annular porous template (7) forms a transmission closed loop based on the driving substrate (6) and the template guide roller unit, the copper foil multistage guide roller unit comprises a transmission front section, a transmission middle section and a transmission rear section, a copper foil substrate (2) in the transmission middle section is positioned between the driving substrate (6) and the annular porous template (7), the copper foil substrate (2) in the transmission middle section is attached to the annular porous template (7), and the etching liquid spraying device (8) is positioned on the etching side of the copper foil substrate (2) in the transmission middle section.
2. The device for continuously preparing the three-dimensional porous copper foil according to claim 1, wherein the cross-sectional width of the annular porous template (7) is equal to or larger than the cross-sectional width of the copper foil base material (2).
3. The device for continuously preparing the three-dimensional porous copper foil according to claim 1, wherein the template guide roller unit comprises a plurality of first guide rollers (3), the driving substrate (6) is horizontally arranged, the plurality of first guide rollers (3) are distributed around the driving substrate (6), the first guide rollers (3) positioned at the input side and the output side of the driving substrate (6) have a first height difference from the driving substrate (6), and the movement direction of the annular porous templates (7) positioned at the input side and the output side of the driving substrate (6) form a first included angle with the driving substrate (6); The copper foil multistage guide roller unit comprises a plurality of second guide rollers (4), the second guide rollers (4) are distributed around the circulating rolling attachment unit, the second guide rollers (4) positioned at the input side and the output side of the driving substrate (6) and the driving substrate (6) have second height differences, and the movement directions of the copper foil base materials (2) positioned at the input side and the output side of the driving substrate (6) and the driving substrate (6) form second included angles; The first height difference is smaller than the second height difference, and the first included angle is larger than the second included angle.
4. The apparatus for continuously preparing a three-dimensional porous copper foil according to claim 1, wherein the annular porous template (7) is provided with a plurality of through holes which are periodically and orderly arranged or uniformly and randomly distributed in a statistical sense, and the pore diameter of the through holes is 5-15 μm and the porosity is 5% -60%.
5. The apparatus for continuously producing a three-dimensional porous copper foil according to claim 1, wherein the thickness of the annular porous template (7) is 10-100 μm, and the material of the annular porous template (7) is one of polyethylene terephthalate, polyimide, polytetrafluoroethylene, polypropylene or polyethylene.
6. The device for continuously preparing the three-dimensional porous copper foil according to claim 1, wherein the etching liquid in the etching liquid spraying device (8) adopts an acidic etching liquid, and the acidic etching liquid comprises an ammonium persulfate solution, a ferric trichloride solution, a sulfuric acid-hydrogen peroxide system or a copper chloride-hydrochloric acid system.
7. The apparatus for continuously preparing the three-dimensional porous copper foil according to claim 1, wherein the post-treatment unit comprises an acid washing unit (9), a water washing unit (10), a passivation unit (11) and a drying unit (12) which are sequentially disposed at an output side of the etching tank (5).
8. A method for continuously producing a three-dimensional porous copper foil, characterized in that the apparatus for continuously producing a three-dimensional porous copper foil according to any one of claims 1 to 7 comprises the steps of: Step S1, the copper foil base material (2) is driven by an unreeling unit (1) and a reeling unit (14), moves at a constant speed and enters an etching groove (5), a driving substrate (6) drives an annular porous template (7) to rotate on a transmission closed loop at the same speed as the copper foil base material (2), and an etching liquid spraying device (8) sprays etching liquid on the annular porous template (7) on the driving substrate (6); step S2, after the angle of the copper foil substrate (2) at the front transmission section entering the circulating rolling attaching unit is adjusted by the copper foil multistage guide roller unit, horizontally attaching the copper foil substrate to the annular porous template (7) at the middle transmission section, and stopping etching liquid in an etching side exposure area of the copper foil substrate (2) by the annular porous template (7) and selectively etching; step S3, when the copper foil substrate (2) enters the rear transmission section, the copper foil substrate (2) and the annular porous template (7) are respectively stripped under the action of a copper foil multistage guide roller unit and a template guide roller unit, and simultaneously, etching liquid on the etching side surface of the copper foil substrate (2) is separated from the copper foil substrate (2) under the action of gravity; And S4, cleaning, passivating and drying the etched copper foil substrate (2) in a post-processing unit to obtain the three-dimensional porous copper foil (13).
9. The method for continuously producing a three-dimensional porous copper foil according to claim 8, wherein the annular porous template (7) generates downward pressure on the copper foil substrate (2) based on self-tension when the annular porous template (7) is attached to the copper foil substrate (2).
10. The method for continuously producing a three-dimensional porous copper foil according to claim 8, wherein the etching solution has a temperature of 35-50 ℃ and an etching time of 30 seconds to 5 minutes.

Description

Device and method for continuously preparing three-dimensional porous copper foil Technical Field The invention belongs to the technical field of metal material processing, and particularly relates to a device and a method for continuously preparing a three-dimensional porous copper foil. Background Copper foil is widely used in the fields of current collectors of electrochemical energy storage devices such as lithium ion batteries, supercapacitors and the like, electromagnetic shielding, catalysis and the like due to excellent conductivity, ductility and chemical stability. The surface of the traditional electrolytic copper foil or the rolled copper foil is smooth and flat, the specific surface area is limited, and the mechanical embedding force and the electrochemical contact area with the active material are required to be improved. To increase the specific surface area and improve the interfacial properties, porous copper foil is an important direction of improvement. The existing method for preparing the porous copper foil mainly comprises a template method, an electrochemical deposition method, a dealloying method and the like. Among them, the chemical etching method is attracting attention because of its relatively simple process and low cost. However, the existing chemical etching technology mostly adopts photoresist patterning and then etching, or uses a randomly distributed pore-forming agent, and has the problems that the process is complex, steps such as exposure and development are needed, the uniformity and consistency of a pore structure are difficult to control accurately, continuous mass production is difficult to realize, and the like. In particular, for high-performance application scenes requiring uniform pore structure and narrow pore size distribution, the existing method has obvious limitations. Disclosure of Invention The application provides a device and a method for continuously preparing a three-dimensional porous copper foil, which aim to solve the technical problems that the three-dimensional porous copper foil in the prior art is complex to process and difficult to produce on a large scale. In order to achieve the above purpose, the present invention provides the following technical solutions: the device for continuously preparing the three-dimensional porous copper foil comprises an unreeling unit, a reeling unit, an etching groove and a post-treatment unit, wherein the etching groove and the post-treatment unit are sequentially arranged between the unreeling unit and the reeling unit; the etching tank is internally provided with a circulating rolling attaching unit, an etching liquid spraying device and a copper foil multistage guide roller unit, the circulating rolling attaching unit comprises a driving substrate, an annular porous template and a template guide roller unit, the annular porous template forms a transmission closed loop based on the driving substrate and the template guide roller unit, the copper foil multistage guide roller unit comprises a transmission front section, a transmission middle section and a transmission rear section, a copper foil substrate in the transmission middle section is positioned between the driving substrate and the annular porous template, the copper foil substrate in the transmission middle section is attached to the annular porous template, and the etching liquid spraying device is positioned on the etching side of the copper foil substrate in the transmission middle section. Further, the cross section width of the annular porous template is more than or equal to the cross section width of the copper foil base material. Further, the template guide roller unit comprises a plurality of first guide rollers, the driving substrate is horizontally arranged, the plurality of first guide rollers are distributed around the driving substrate, the first guide rollers on the input side and the output side of the driving substrate are respectively provided with a first height difference with the driving substrate, and the movement directions of the annular porous templates on the input side and the output side of the driving substrate are respectively provided with a first included angle with the driving substrate; The copper foil multistage guide roller unit comprises a plurality of second guide rollers, the second guide rollers are distributed around the circulating rolling attachment unit, the second guide rollers on the input side and the output side of the driving substrate and the driving substrate have a second height difference, and the movement direction of the copper foil base material on the input side and the output side of the driving substrate and the driving substrate form a second included angle; The first height difference is smaller than the second height difference, and the first included angle is larger than the second included angle. Furthermore, the annular porous template is provided with a plurality of through holes which a