CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a national phase entry under 35 U.S.C. § 371 of International Application No. PCT/KR2018/013468, filed Nov. 7, 2018, published in Korean, which claims priority to and the benefit of Korean Patent Application No. 10-2017-0148728 filed Nov. 9, 2017, the entire contents of all of which are incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to an apparatus for manufacturing a copper foil. More particularly, the present invention relates to an apparatus for manufacturing an electrolytic copper foil.

BACKGROUND ART

A copper foil may be mainly used as a current collector of a secondary battery or a printed circuit board (PCB).

Such a copper foil has a small thickness and may be obtained by a method in which a rotating drum is immersed in an electrolyte and copper is precipitated. That is, the rotating drum is immersed in the electrolyte including a copper ion, a current is allowed to flow in a pair of electrodes, and a copper thin film precipitated on a surface of the rotating drum is separated, thereby obtaining a copper foil. In this case, the copper foil may be continuously manufactured by rotation of the rotating drum.

Meanwhile, the copper foil is generated on the surface of the rotating drum and then separated, and is affected by a surface state of the rotating drum.

That is, when there are foreign matters on the surface of the rotating drum, a shape of the foreign matter may be transferred onto the surface of the copper foil having a small thickness or grain growth of copper may be non-uniform. Therefore, one surface of the copper foil exposed to air is not in contact with the other surface of the copper foil which is separated from the surface of the rotating drum in a state in which the other surface of the copper foil is in contact with the surface of the rotating drum, thus the surfaces of the copper foil have different shapes from each other.

When the copper foil has different surface characteristics, the surfaces of the copper foil may have different glosses and an adhesive force difference may occur. In particular, when the copper foil is used as a current collector of a secondary battery, adhesion of an active material formed on the copper foil is lowered, resulting in lowering electrical characteristics of the secondary battery.

To solve these problems, as a post-processing, a surface etching method, an additional coating method, or the like is performed, but there are increases in cost and process time.

DISCLOSURE

Technical Problem

The present invention has been made in an effort to provide an apparatus for manufacturing an electrolytic copper foil capable of easily manufacturing a copper foil having various shaped surface, if necessary, without an additional post-processing.

Technical Solution

An exemplary embodiment of the present invention provides an apparatus for manufacturing an electrolytic copper foil, including: an electrolytic bath defining a cavity for receiving an electrolyte; an internal drum partially disposed in the cavity; an outer drum in contact with a surface of the internal drum; a counter electrode positioned in the cavity of the electrolytic bath and positioned to be spaced apart from the internal drum by a predetermined distance; and a power supply unit electrically connecting the internal drum and the counter electrode.

The outer drum may have a hollow tube shape and the internal drum may be inserted into the outer drum.

The outer drum may have a surface in which a plurality of protrusions are formed, the plurality of protrusion each having a predetermined shape.

A height of the protrusion may be 0.5 μm to 10 μm.

The plurality of protrusions may be arranged with a predetermined interval interposed therebetween.

The interval between the protrusions may be 5 μm to 100 μm.

A cross section of one of the protrusions cut in a direction perpendicular to the surface of the outer drum may be a polygonal shape including a triangular shape and a quadrangle shape or a curved shape including a hemispherical shape and a circular shape.

The outer drum may be formed of a conductive material.

The conductive material may be any one selected from the group consisting of a Ti-based material, a Zr-based material, a Fe-based material, a Ni-based material, a Pb-based material, a C-based material, or a Si-based material, or an alloy thereof, or a conductive polymer material.

Advantageous Effects

As in the present invention, when using the outer drum, the copper foil may be manufactured without an additional processing.

In addition, the copper foil having various surface characteristics may be easily manufactured by diversifying shapes of a roughness formed on the surface of the outer drum.

