Equipment for producing copper foil and process for producing copper foil by using same

Abstract

The present invention provides an equipment for producing a copper foil and a process for producing a copper foil by using same, the equipment comprising: a drum for forming a copper foil from copper ions deposited from an electrolytic bath; a peeling roller for peeling off the copper foil deposited on the surface of the drum; a precision cutting unit including a razor blade for precisely cutting the copper foil; and a winding unit for winding the precisely cut copper foil.

Description

[0001] [DESCRIPTION]

[0002] [ Invent ion Ti t le ] Copper foil manufacturing apparatus and copper foil manufacturing method using the same {Equipment For Producing Copper Foi 1 And Process For Producing Copper Foi 1 Using The Same} [Techni cal Field] The present invention relates to a copper foil manufacturing apparatus and a copper foil manufacturing method using the same. [Background Art ] Copper foil is mainly used for secondary batteries, printed circuit boards, etc. Copper foil is particularly mainly used as an anode current collector for lithium secondary batteries, and an anode for a secondary battery can be formed by coating an active material, a conductive material, etc. on the copper foil. A general copper foil production process is divided into a foil manufacturing process for producing copper foil in a predetermined drum width and a slitting process for cutting the copper foil to the width of an ordered product. Fig. 1 shows a general conventional copper foil production process. In Fig. 1, the copper foil, trimming, rust prevention, and winding processes can be referred to as foil manufacturing processes, and the secondary trimming (slitting) and quality inspection processes can be referred to as slitting processes. The aging process stabilizes the crystal structure of the deposited copper foil and improves its physical properties. It is an intermediate step between the foil manufacturing process and the slitting process. As illustrated in Figure 2, the foil manufacturing process first involves a trimming process to separately remove the side surfaces of the copper foil with unstable properties or thickness, followed by a rust prevention treatment to prevent oxidation of the copper foil. After trimming, the rust prevention-treated copper foil is aged for approximately 1 to 2 days until it has a strength suitable for high-speed slitting, and then sent to a slitter to undergo a slitting process to cut it to the desired width. After the slitting process, copper foil quality inspections such as appearance inspection and thickness inspection are performed. Figures 1 and 2 illustrate the conventional copper foil manufacturing process. Since copper foil tends to oxidize when exposed to air, it undergoes a rust prevention treatment to prevent oxidation when manufacturing it.As illustrated in Figures 1 and 2, in a typical copper foil manufacturing process, copper foil is formed, then trimmed, subjected to an anti-rust treatment, and then slitting (secondary trimming) is performed to cut the foil into the desired width during the product manufacturing stage. In this way, in a conventional copper foil manufacturing process, the slitting step is performed by a slitter after the anti-rust treatment step, so the side surfaces that have already been anti-rust treated during the foil manufacturing process are removed during the slitting process (refer to Figure 2, the part indicated by the dotted line, i.e., the side anti-rust portion, can be seen removed by the slitter). Therefore, the side surfaces of the final product are not treated with an anti-rust treatment and are exposed to the air, making them vulnerable to oxidation. Oxidation of copper foil can deteriorate its quality and durability, so copper foil produced through a typical copper foil production process has the problem that the side surfaces are not treated with an anti-rust treatment and are exposed, making them vulnerable to oxidation. Furthermore, in a conventional copper foil manufacturing process, after forming the copper foil in the foil manufacturing process, in order to perform high-speed cutting in the slitting process, the copper foil needs to have properties suitable for high-speed slitting. To this end, an aging process is required, in which the copper foil produced in the foil making machine is stored at room temperature for approximately 2 to 3 days, which results in additional production lead time. The aging process stabilizes the crystal structure of the electrodeposited copper foil and prevents the deterioration of cut quality that occurs during trimming, but this process reduces production efficiency and increases costs. In addition, in the conventional copper foil production process, the copper foil is trimmed before being slit, so it goes through a two-step cutting process of trimming and slitting (see Figures 1 and 2). When conventional equipment is used, the two-step cutting increases the amount of cut-off, resulting in unnecessary loss during the production process. For example, as shown in Figure 2, in an example of the conventional foil making process, 21 mm of length on each side are trimmed and cut, and in the slitting process, an additional 10 mm of length on each side is slit, resulting in a total material loss of 62 mm.This can lead to an increase in production costs. In addition, since the quality inspection unit is installed after the foil manufacturing process in the conventional copper foil production process, it is not possible to closely check whether the copper foil is defective or its quality during the foil manufacturing process before a defect is detected at this stage. Therefore, there is a possibility that defective products will continue to be produced until a defect is detected at the slitting stage. Patent Publication No. 2022-0101516 discloses an electrolytic copper foil manufacturing apparatus including a cathode drum, a peeling roller, and an edge cutter. However, the document does not disclose the inclusion of a precision cutting unit or the simultaneous performance of the slitting and trimming processes. The present inventors have completed the present invention as a result of efforts to improve these problems.

[0003] [Disclosure]

[0004] [Technical Problem] One object of the present invention is to provide a copper foil manufacturing device for producing copper foil having excellent oxidation resistance due to rust-prevention treatment on the side, and a copper foil manufacturing method using the same. Another object of the present invention is to provide a copper foil manufacturing device that improves efficiency by shortening the production lead time, and a copper foil manufacturing method using the same. Another object of the present invention is to provide a copper foil manufacturing device that reduces unnecessary trimming work and minimizes loss, thereby improving quality and minimizing production loss, and a copper foil manufacturing method using the same. Still another object of the present invention is to provide a copper foil manufacturing device that can check the quality of copper foil in real time in a foil manufacturing machine, thereby reducing the production of defective products, and a copper foil manufacturing method using the same.

[0005] [Technical Solution] In order to achieve the above object, one embodiment of the present invention provides a copper foil manufacturing device including a drum for forming copper foil from copper ions deposited from an electrolytic cell, a peeling roller for peeling the copper foil deposited on the surface of the drum, a precision cutting unit including a razor blade for precisely cutting the copper foil, and a winding unit for winding the precisely cut copper foil. Another embodiment of the present invention provides a copper foil manufacturing method including the steps of forming copper foil on a drum by depositing copper ions from an electrolytic cell, the step of peeling the copper foil deposited from the surface of the drum, the step of precisely cutting the peeled copper foil using a precision cutting unit including a razor blade, and the step of winding the precisely cut copper foil.

[0006] [Advantages and Effects] When using a copper foil manufacturing device and a copper foil manufacturing method using the same according to an embodiment of the present invention, copper foil having excellent resistance to oxidation can be provided due to the side surface being treated with rust prevention. When using a copper foil manufacturing device and a copper foil manufacturing method using the same according to an embodiment of the present invention, a separate aging time is not required, so the production lead time can be reduced, thereby improving productivity. In addition, when using a copper foil manufacturing device and a copper foil manufacturing method using the same according to an embodiment of the present invention, a separate additional trimming process can be omitted, thereby minimizing unnecessary loss of copper foil material. This can reduce production costs. In addition, when using a copper foil manufacturing device and a copper foil manufacturing method using the same according to an embodiment of the present invention, the copper foil quality can be inspected in a foil-making machine and the copper foil can be cut according to customer requirements, thereby eliminating an additional slitting process, thereby simplifying the process and improving productivity. In addition, when using a copper foil manufacturing device and a copper foil manufacturing method using the same according to an embodiment of the present invention, the copper foil quality can be checked in real time, thereby reducing the production of defective products.

[0007] [Description of Drawings] Fig. 1 shows a copper foil manufacturing process according to the prior art. Fig. 2 shows an example of a copper foil manufacturing process according to the prior art, in which a side surface subjected to rust prevention treatment is removed. Fig. 3 shows a copper foil manufacturing process according to an example of the present invention. Fig. 4 shows an example of a copper foil manufacturing process according to the present invention, in which a side surface not subjected to rust prevention treatment is removed by precision cutting, and a portion of the copper foil to be manufactured is subjected to rust prevention treatment. Fig. 5 shows a copper foil manufacturing apparatus according to an example of the present invention. Fig. 6 shows a part (mainly, a precision cutting section) of a copper foil manufacturing apparatus according to an example of the present invention. Fig. 7 shows a cutting process by a laser used in the precision cutting section of the copper foil manufacturing apparatus according to an example of the present invention and a cutting process by a rotary knife according to an example of the prior art. FIGS. 8 and 9 are photographs showing whether an overlapping phenomenon (Telescoping) occurs in copper foil produced using a precision cutting part according to an example of the present invention and a slitter according to a conventional technique (Experimental Example 1), respectively. FIG. 10 is a photograph comparing a cross-section of a copper foil product produced using a precision cutting part using a laser blade according to an example of the present invention and a rotary knife slitter according to a conventional technique (Experimental Example 2). FIG. 11 is an SEM photograph comparing a cross-section of a copper foil product produced using a precision cutting part using a laser bleed according to an example of the present invention and a rotary knife slitter according to a conventional technique (Experimental Example 2). FIG. 12 shows the results of an oxidation test depending on the presence or absence of passivation.

[0008] [Mode for Invention] In the present invention, each term is defined as follows. In the present invention, 'copper foil' means a thin foil formed by copper. Copper foil is mainly used in secondary batteries, printed circuit boards, etc., and in secondary batteries, it is mainly used as a battery foil as an anode current collector of a lithium secondary battery. In the present invention, the copper foil is preferably a battery foil. Copper foil can be classified into rolled copper foil and electrolytic copper foil, and in the present invention, the copper foil is preferably an electrolytic copper foil, that is, a copper foil formed by an electrolytic deposition method. In the present invention, 'foil making' means a process of forming a copper foil by depositing copper ions from an electrolytic cell onto a drum and separating the copper foil from the drum through a peeling roller. In the present invention, 'foil making' refers to a process of making a copper foil into a circular roll shape, including not only the above process but also a rust prevention process to prevent oxidation of the copper foil, a trimming process to cut the copper foil, and a winding process. This is distinguished from the slitting process, which is a process of cutting a rolled copper foil roll into a narrow width according to the customer's needs, inspecting the quality, and forming the shape of the final product. Hereinafter, a copper foil manufacturing apparatus according to an example of the present invention will be described with reference to FIG. 5. The copper foil manufacturing apparatus according to an example of the present invention includes a drum (10) that forms copper foil from copper ions deposited from an electrolytic bath, a peeling roller (20) that peels the copper foil deposited on the surface of the drum (10), a precision cutting unit (30) including a razor blade that precisely cuts the copper foil, and a winding unit (80) that winds the precisely cut copper foil. The copper foil manufacturing apparatus according to an example of the present invention may further include a rust-preventing treatment unit. The rust-preventing treatment unit performs a rust-preventing treatment to prevent the copper foil from being oxidized. The rust-preventing treatment plays an important role in increasing the durability of copper foil products and improving their quality. For example, the passivation tank (40) of FIG. 5 may include a rust-preventing treatment unit. The above drum (10) is used when depositing copper ions from an electrolytic cell.A rotating metal drum may be used as the drum (10), but is not limited thereto as long as it can be generally used in the present technical field. Copper ions deposited on the surface of the drum (10) are reduced to continuously form a thin copper foil. The peeling roller (Peeling roller; 20) serves to peel the copper foil deposited on the surface of the drum (10). As shown in FIG. 5, the copper foil peeled through the peeling roller (20) is transferred to a precision cutting unit (30). The precision cutting unit (30) includes a razor blade. As shown in FIG. 6, an example of the precision cutting unit (30) includes an upper knife (31) which is a razor blade and a lower roller (32). The upper knife (31) is positioned above the precision cutting unit (30) and cuts the copper foil transferred through the lower roller (32) positioned below it. Since the above-described precision cutting unit (30) includes a laser blade, it can precisely cut copper foil. Accordingly, by using the precision cutting unit (30) according to the present invention, trimming and slitting can be performed substantially simultaneously. In the present invention, since a strong cut called precision cutting is performed, as illustrated in FIGS. 3 and 4, a separate secondary trimming, i.e., a slitting process, is not required. According to one example of the present invention, only one cutting (trimming, which may also be referred to as copper foil trimming) is performed and a separate additional cutting process (secondary trimming (slitting) of FIGS. 1 and 3) is not performed, so the length of the copper foil that is trimmed and removed is only 42 mm, which is significantly reduced compared to the length of the copper foil removed in the conventional copper foil manufacturing process illustrated in FIG. 2 (trim length 62 mm). Therefore, material loss can be reduced. It is preferable that the upper knife (31) is performed using a razor blade in a point cutting manner.In conventional copper foil manufacturing equipment, a non-powered rotary knife was used as the knife (see Fig. 7). This method cuts the object by the rotation of the knife itself, and problems with the cutting pattern or cut surface can occur due to the shaking of the knife. On the other hand, according to an example of the present invention, if a laser blade is used as the upper knife (31), cutting is performed using a point cutting method, which can improve the cutting quality. The cutting method using the laser blade is a method of cutting the object with a thin and sharp blade. In this method, the object is generally cut by passing the object in a straight line between a fixed knife and a rotating lower roll. The laser blade is extremely sharp, allowing for precise and fine cutting, and since it is a method of cutting with a fixed knife, it can form a clean cut surface. When point-by-point cutting is performed using the laser blade method in this way, more precise cutting is possible and quality deterioration due to knife shaking can be prevented. In this way, the copper foil manufacturing equipment according to an example of the present invention can perform side cutting with good quality by using an optimized upper knife (31). The above precision cutting unit (30) may additionally include an external tension change buffer unit (33) that buffers external tension changes during cutting to maintain cutting quality (see FIG. 6). The external tension change buffer unit (33) serves to stably control external tension changes that occur during cutting, particularly tension changes that may occur during the process of attaching the edge (edge) of manually cut copper foil to a trim winder. In addition, the external tension change buffer unit (33) is intended to prevent a situation in which the cut edge (Trim) is wound over a certain diameter on the trim winder (100) after cutting the edge portion of the copper foil in the copper foil manufacturing device, and to reduce the influence of manual work.Specifically, when cutting copper foil in a copper foil manufacturing device, the cut edge portion is wound by a trim winder (100), and at this time, a worker can manually connect and reattach the edges that have fallen off. However, when connecting the edges, the pulling force of the worker can directly affect the trimmed copper foil, which can lower the quality of the copper foil. For example, if the tension is too great, the trimmed copper foil (90) may break or even the fabric may be torn, causing the process to be stopped, and if the tension is too small, the cutting quality may be incomplete. The external tension change buffer unit (33) automatically compensates for tension changes or imbalances in the cut copper foil to maintain a constant tension. The external tension change buffer unit (33) buffers irregular tension changes or physical forces caused by manual work, thereby maintaining a uniform and clean cutting quality. For example, a nip roller and a spring can be used as the external tension change buffer unit (33). The above nip roller serves to control the tension and transport the copper foil by pressing it so that it does not slip or wrinkle during the cutting process. In other words, the nip roller serves to uniformly transport the trimmed copper foil (90) while applying pressure to ensure uniform cutting quality. It is preferable to use a rubber-coated contact nip roller as the nip roller so as not to damage the copper foil. When the nip roller is used, the tension effect can be eliminated when winding the trim after cutting, thereby stably maintaining the cutting quality even when working manually. In addition, the precision cutting unit (30) may additionally include a vibration resistance reinforcing unit (34) that minimizes the vibration of the upper knife (31) during cutting and reinforces the resistance to vibration. As illustrated in FIG. 6, the vibration resistance reinforcing unit (34) controls the movement of the upper knife (31) to minimize vibration that may occur during cutting.The vibration-resistant reinforcing member (34) above serves to buffer tension changes at the edge of the copper foil, thereby maintaining a constant cutting quality. Since vibrations generated during the cutting process can affect the cutting quality, the vibration-resistant reinforcing member (34) serves to improve the cutting quality by reducing unnecessary vibrations by ensuring that the upper knife (31) is better fixed. The vibration-resistant reinforcing member (34) effectively absorbs or reduces vibrations to maintain a constant cutting quality, and extends the life of the knife and various machine parts by reducing wear caused by vibrations to increase durability. In addition, by reducing vibrations, it enables accurate cutting, and also controls the frequency and amplitude of vibrations. The vibration-resistant reinforcing member (34) may use, but is not limited to, a spring method that uses a spring to compress or confirm the spring when tension suddenly changes to absorb shock, a damper method that absorbs physical shock that may occur during the cutting operation and controls vibration, and a variable tension adjustment method that automatically adjusts the tension to maintain a constant tension. Additionally, the precision cutting unit (30) may include a laser blade adjustment unit (35). The laser blade adjustment unit (35) is a device that precisely adjusts the position of the blade (31). This mainly adjusts the height and left and right height of the blade (31) to align the cutting line or respond to thickness changes. The laser blade adjustment unit (35) serves to more precisely adjust the position or angle of the blade (31) while cutting copper foil using the laser blade (31) to maintain a constant cutting quality. According to one example of the present invention, the accuracy and efficiency of the cutting work can be improved through the laser blade adjustment unit (35). In addition, according to one example of the present invention, uniform pressure and speed can be maintained during cutting through the laser blade adjustment unit (35).The laser blade adjustment unit (35) includes an adjustment block equipped with a dial gauge so that the cutting knife (31) can be lowered to a certain depth in contact with the lower roller (32). The laser blade adjustment unit (35) may also have a notification system that notifies the replacement cycle of the blade (31) so that the blade (31) can be maintained in an optimal condition, and a wear sensor that can detect the wear condition of the blade (31). The laser blade adjustment unit (35) may include a blade support guide block that supports the blade (31) so that it can cut at an accurate position, and a blade holder that stably and firmly fixes the blade. It may also include, for example, a bolt and clamp structure that prevents vibration or slight positional changes during cutting. The laser blade adjustment unit (35) may also include a gear unit and a handle-type adjustment unit. These also finely adjust the position of the blade (31) so that the cutting position can be changed or the blade (31) can be easily replaced when performing maintenance. In addition, the precision cutting unit (30) may further include, for example, an upper knife pressure adjustment unit (not shown) for adjusting the pressure of the upper knife (31). The upper knife pressure adjustment unit may include, for example, a spring unit and / or a hinge unit (not shown). The spring unit and / or hinge unit may be designed to adjust the pressure when necessary while maintaining a constant cutting pressure. The spring unit may also serve to absorb shock and extend the life of the blade. The copper foil manufacturing apparatus according to one example of the present invention can further improve the quality of the copper foil produced by additionally including an external tension change buffer unit (33) and a vibration resistance reinforcing unit (34) when cutting the copper foil, as illustrated in FIG. 6.The precision cutting unit of the copper foil manufacturing device according to one embodiment of the present invention includes an upper knife (31) including a laser blade, and preferably further includes at least one of an external tension change buffer unit (33), a vibration resistance reinforcing unit (34), a laser blade adjusting unit (35), and an upper knife pressure adjusting unit, thereby enabling more precise cutting. Accordingly, by not performing an additional cutting process through a separate slitting process, effects such as a reduction in aging time, a reduction in defects in the slitter, and an improvement in L / S can be obtained. The copper foil manufacturing device according to one embodiment of the present invention is characterized in that it is an integrated copper foil manufacturing device that performs a foil manufacturing process and a slitter process at the same time by having the precision cutting unit as described above. That is, as shown in FIG. 4, trimming in the foil and slitting by the slitter are performed together instead of separately, and as a result, the trimmed length is reduced (in the case of FIG. 4, the length removed by trimming is 42 mm, which is significantly reduced compared to 62 mm of the conventional technology of FIG. 2), and the loss of material is also reduced. Another example of the present invention provides a precision cutting machine for manufacturing copper foil, which includes an upper knife (31) positioned at the top to precisely cut copper foil and including a laser blade, a lower roller (32) positioned at the bottom to transport the copper foil thereon and be cut by the laser blade, an external tension change buffering unit (33) that contacts the lower roller (32) to buffer external tension change that occurs during cutting to maintain cutting quality, and a vibration resistance reinforcing unit (34) that fixes the upper knife (31) to minimize vibration. Another example of the present invention preferably provides a precision cutting machine for manufacturing electrolytic copper foil. A copper foil manufacturing apparatus according to an example of the present invention may include a passivation bath (also called a 'surface treatment bath'; 40).The above passivation bath (40) is also called a passivation treatment bath and is a bath that performs chemical surface treatment to prevent the copper foil from corroding. As illustrated in FIG. 5, the copper foil that has passed through the precision cutting section (30) moves to the passivation bath (40). The passivation bath (40) forms a protective film on the copper foil to prevent oxidation and / or corrosion while maintaining conductivity. A chromium-based or other chemical solution is mainly used in the passivation bath (40). The copper foil manufacturing apparatus according to an example of the present invention may additionally include an SQ roller (50). The SQ roller (50) is also called a squeeze roller or a pressing roller. It serves to remove excessive solution present on the surface of the copper foil after the passivation treatment. That is, the SQ roller (50) uniformly distributes the chemical solution remaining on the surface of the copper foil after the passivation treatment and removes excessive liquid to maintain an optimal surface condition. The above SQ roller (50) is applied by pressing directly onto the copper foil while it is wet with liquid after passing through the passivation bath (40). The copper foil manufacturing apparatus according to an example of the present invention may additionally include a dryer (60, 70). The dryer (60, 70) is a device that removes moisture by drying. Two or more dryers may be used. The two or more dryers may be a dryer (60) that dries the upper surface of the copper foil and a dryer (70) that dries the lower surface. The dryer (60, 70) evaporates and removes the solution residue remaining after the copper foil passes through the SQ roller (50). Drying is generally performed by hot air or IR. In some cases, the temperature may be gradually increased to control the drying speed so as not to be too fast. By removing moisture through drying by the dryer, the copper foil may not be contaminated in a subsequent process. If necessary, an additional dryer may be provided to completely remove any traces of moisture that may still remain in the copper foil after drying by the dryer and before the winding step.According to an embodiment of the present invention, a copper foil manufacturing apparatus may preferably additionally include a quality inspection unit (not shown) between the squeeze roller (50) and the winding unit (80). As shown in FIG. 5, the cut copper foil is transported to a passivation bath (40). The quality inspection unit is included in the copper foil manufacturing apparatus and can inspect the appearance of the copper foil transported through the drum (10) in real time. According to an embodiment of the present invention, the copper foil manufacturing apparatus may additionally inspect the thickness and mechanical properties of the copper foil in addition to the appearance inspection in the quality inspection unit. The quality inspection unit may perform a quality inspection of the copper foil all at once before the winding step in the winding unit. The quality inspection unit may check whether the copper foil maintains the desired quality and may detect defective products at an early stage to increase production efficiency. According to an embodiment of the present invention, the copper foil manufacturing apparatus may additionally include a quality inspection unit even after the winding unit (80). After winding, the quality inspection unit inspects the quality of the copper foil before final product manufacture through appearance inspection and thickness inspection. The copper foil manufacturing device according to an example of the present invention may include the quality inspection unit between the squeeze roller (50) and the winding unit (80), after the winding unit (80), or at both locations. If it is included only between the squeeze roller (50) and the winding unit (80), there is an advantage in that the quality inspection can be performed in advance before winding to check for defects in advance, and if it is included at both locations, there is an advantage in that the quality inspection can be performed in two stages to perform a more complete quality inspection. The copper foil manufacturing device according to an example of the present invention may include a winding unit (80) (see FIG. 5). The winding unit (80) has a function of winding the cut copper foil onto a bobbin. The winding unit (80) enables the copper foil to be wound in a desired size and width.The above-mentioned winding unit (80) maintains the shape of the copper foil consistently and protects it from damage during movement. The copper foil manufacturing apparatus according to an example of the present invention may additionally include a control system (not shown). The control system can control each operation of the copper foil manufacturing apparatus through various sensors and monitoring devices. By using the copper foil manufacturing apparatus according to an example of the present invention, it is possible to provide a copper foil having excellent resistance to oxidation due to a rust-preventive treatment on the side surface (see FIG. 4, it can be confirmed that a copper foil having a rust-preventive treatment on the side surface is obtained). In addition, when using the copper foil manufacturing apparatus according to an example of the present invention, a separate aging time is not required, so the production lead time can be reduced, thereby improving productivity in copper foil manufacturing. In addition, when using the copper foil manufacturing apparatus according to an example of the present invention, a separate additional trimming (slitting) process can be omitted, so the loss of unnecessary copper foil materials can be minimized, thereby reducing production costs. In addition, when using a copper foil manufacturing device according to an embodiment of the present invention, the copper foil quality can be inspected in the foil manufacturing machine and the copper foil can be cut according to the customer's requirements, thereby omitting an additional slitting process, thereby manufacturing the copper foil more simply and with higher productivity. In addition, when using a copper foil manufacturing device according to an embodiment of the present invention, the quality of the copper foil can be checked in real time, thereby reducing the production of defective products. Hereinafter, a copper foil manufacturing method according to an embodiment of the present invention will be described. The copper foil manufacturing method according to an embodiment of the present invention includes a step of forming a copper foil on a drum by depositing copper ions from an electrolytic cell, a step of peeling the deposited copper foil from the drum surface, a step of precisely cutting the peeled copper foil using a precision cutting unit including a razor blade, and a step of winding the precisely cut copper foil. The copper foil manufacturing method according to an embodiment of the present invention may additionally include a rust prevention treatment step.The above-described rust-prevention step is a step for performing rust-prevention treatment to prevent oxidation of the copper foil immediately after the precision cutting step. The coating for preventing oxidation of the copper foil can be performed within the copper foil manufacturing device. The rust-prevention treatment plays an important role in increasing the durability of copper foil products and improving their quality. The above-described rust-prevention step can be performed, for example, in the passivation bath (40) of FIG. 5. The above-described copper foil forming step is a step for forming a copper foil on a drum (10) by depositing copper ions from an electrolytic bath. The copper ions deposited on the surface of the drum (10) are reduced to continuously form a thin copper foil. The thin copper foil thus formed undergoes a peeling step using a peeling roller (20). The peeling step is a step for peeling the deposited copper foil from the surface of the drum (10). This step is a step for peeling the copper foil formed on the surface of the drum (10) from the drum (10) using a peeling means such as a peeling roller (20). In the peeling step, it is important to maintain the quality by making the thickness of the copper foil uniform. The copper foil that has gone through the peeling step is transferred to a precision cutting unit (30) and goes through a precision cutting step. The precision cutting step is a step of precisely cutting the peeled copper foil using a precision cutting unit (30) including a razor blade. The precision cutting step can be performed by an upper knife (31) located at the top and a lower roller (32) located at the bottom (see Fig. 6). The upper knife (31) located at the top and made of a razor blade cuts the copper foil being transferred over the lower roller (32) to a desired width. Since the knife is made of a razor blade, the copper foil material can be precisely cut in the precision cutting step. Through this, the conventional trimming step and slitting step can be performed simultaneously.The conventional trimming step is a step in the foil manufacturing step to remove unnecessary parts by organizing the outer shape or side surface of the copper foil, and the conventional slitting step is a step performed in a slitter after the trimming step and the rust prevention step, and is a step to cut the copper foil to a desired width (see Figs. 1 and 2). The precision cutting step according to an example of the present invention, unlike the conventional copper foil manufacturing method, does not require a separate trimming or additional slitting process. Since this step does not require a separate slitting step, the copper foil can be produced without a separate aging process, thereby shortening the production lead time. In this way, in the copper foil manufacturing method according to an example of the present invention, an integrated copper foil manufacturing device in which trimming and slitting are implemented at once is used (see Figs. 3 and 4). In the precision cutting step, a laser blade is used as the upper knife (31). Through this, the precision cutting step can be performed in a point cutting manner. In the conventional copper foil manufacturing step, a non-powered rotary knife was used as the upper knife (31) (see Fig. 7). This method cuts the object by the rotation of the knife itself, and problems with the cutting pattern or the cut surface may occur due to the shaking of the knife. On the other hand, according to an example of the present invention, if a razor blade is used as the upper knife (31), cutting is performed by a point cutting method, so that the cutting quality can be improved. The cutting method using a razor blade is a method of cutting the object with a thin and sharp blade, and in this method, the object is generally cut by passing in a straight line between a fixed knife and a roll. In other words, if point-by-point cutting like the razor blade method is performed, more precise cutting can be performed and quality deterioration due to knife shaking can be prevented. In this way, the copper foil manufacturing method according to an example of the present invention can perform side cutting with good quality in the precision cutting step by using an optimized upper knife (31).The above precision cutting step may further include an external tension change buffering step for maintaining cutting quality by buffering external tension changes during cutting. The external tension change buffering step serves to stably control external tension changes that occur during cutting, particularly tension changes that may occur during the process of attaching manually cut copper foil edges to the trim winder (100). Since the intervention of a pulling force by a worker affects the cutting quality, this step helps to maintain the cutting quality at a constant level by buffering this. That is, the tension is cut with a nip roll after cutting to maintain stable quality. In addition, the above precision cutting step may further include a vibration resistance strengthening step for minimizing vibration of the upper knife (31) during cutting and strengthening resistance to vibration. The vibration resistance strengthening step serves to minimize vibrations that may occur during cutting by controlling the movement of the upper knife (31). Since vibrations that occur during the cutting process may affect the cutting quality, the vibration resistance strengthening part (34) serves to improve the cutting quality by reducing unnecessary vibrations by strengthening the fixation of the upper knife (31). According to an example of the present invention, the copper foil manufacturing step can further improve the production quality by additionally including a step of buffering external tension change during copper foil cutting and a step of reinforcing vibration resistance. The step of buffering external tension change and / or the step of reinforcing vibration resistance can be performed substantially simultaneously with the copper foil cutting. Here, the term "substantially simultaneously" includes not only being performed at the same time but also being performed at slightly different times within a range capable of substantially buffering external tension change due to copper foil cutting and / or substantially reinforcing vibration resistance due to copper foil cutting. The edge portion removed by the precision cutting step, i.e., the cut copper foil, can be wound by a separate winding unit, i.e., a trim winding unit (100).Through this, scrap generated during the production process can be managed (see Fig. 5). The copper foil with the edges removed by the precision cutting step can be passivated and dried in a subsequent process. The passivation step is a step in which the copper foil is treated to prevent oxidation and / or corrosion by a passivation bath (40). Mainly, a chromium series or other chemical solution is used to improve the durability of the copper foil. The copper foil that has gone through the passivation step can be conveyed to an SQ roller (50).

[0009] The SQ roller step is a step for removing the residual solution remaining on the surface of the copper foil after passivation treatment using a squeeze roller (50). This step improves quality by reducing excessive chemicals while maintaining the surface of the copper foil uniformly. This step is performed by directly squeezing the copper foil while it is still wet with liquid after passing through the passivation bath (40) with the SQ roller (50). The drying step is a step for removing moisture by drying. In the drying step, the drying speed can be controlled by gradually increasing the temperature. The drying step is a step for removing moisture remaining after passing through the squeeze roller (50). If necessary, a secondary drying step can be performed to completely remove even the smallest moisture that may remain before the winding process for more complete drying. The copper foil manufacturing step according to an example of the present invention may additionally include a quality inspection step. The quality inspection step is a step for inspecting the quality of the copper foil, such as the thickness, appearance, and mechanical properties of the copper foil, in real time, and may be performed after passing through the squeeze roller (50) and before the winding step. When the copper foil is transported through the drum (10), in the quality inspection step, the quality inspection unit checks whether the copper foil maintains the desired quality and detects defective products early to increase production efficiency. The quality inspection step may also be performed after the winding step. The quality inspection step after the winding step is a step to inspect the quality of the copper foil before final productization through appearance inspection and thickness inspection. According to an example of the present invention, the quality inspection step may be performed only after winding, or may be performed both before and after winding, or may be performed only before winding. The copper foil manufacturing step according to an example of the present invention may include a winding step. The winding step is a step to prepare the copper foil, which has completed the quality inspection, as a final product by winding it in a roll shape on a bobbin. In the winding step, the copper foil can be adjusted to a specific size and width according to the customer's requirements.Through the winding step, the shape of the copper foil can be maintained constant and protected from damage during movement. The copper foil manufacturing apparatus according to an embodiment of the present invention may additionally include a control step by a control system. The control system can control the operation of the foil maker through various sensors and monitoring devices. By using the copper foil manufacturing method according to an embodiment of the present invention, it is possible to provide copper foil having excellent resistance to oxidation due to its side being treated with anti-rust treatment. In addition, when using the copper foil manufacturing method according to an embodiment of the present invention, a separate aging time is not required, so the production lead time can be reduced, thereby improving productivity in copper foil manufacturing. In addition, when using the copper foil manufacturing method according to an embodiment of the present invention, a separate additional trimming process can be omitted, so that unnecessary loss of copper foil material can be minimized, thereby reducing production costs. In addition, when using the copper foil manufacturing method according to an embodiment of the present invention, the copper foil quality can be inspected in the foil maker and the copper foil can be cut according to the customer's requirements, thereby omitting an additional slitting process, so that copper foil can be manufactured more simply and with higher productivity. In addition, when using a copper foil manufacturing method according to an example of the present invention, the quality of the copper foil can be checked in real time to reduce the production of defective products. Example 1 Copper foil was manufactured using a copper foil manufacturing device (copper foil manufacturing device according to FIG. 5) having a precision cutting section equipped with a laser blade (product name: Di amaze). Comparative Example 1 Copper foil was manufactured using the same copper foil manufacturing device (ITC) as Example 1, except that it has a cutting section equipped with a rotary shear knife of Tidland instead of a laser blade and that a slitter section is additionally included after the winding section.Experimental Example 1 - Telescoping Test Copper foil peeled from a drum was cut using a precision cutting section equipped with a laser blade (product name: Diamaze) of the device according to Example 1, and it was confirmed whether or not a telescoping phenomenon occurred in the cut section. In addition, copper foil was cut using a slitter equipped with a conventional rotary knife of the device according to Comparative Example 1, and it was confirmed whether or not a telescoping phenomenon occurred in the cut section, which is a phenomenon in which copper foil is not properly wound on a roll or is irregularly wound and piled up and overlaps. The results of the confirmation are shown in FIGS. 8 and 9, respectively. When a precision cutting section equipped with a laser blade (product name: Diamaze) according to Example 1 was used, it was found that no telescoping phenomenon occurred at all, as shown in FIG. 8. On the other hand, when a slitter equipped with a conventional rotary knife according to Comparative Example 1 was used, the telescoping phenomenon clearly occurred, as indicated by the arrows in FIG. 9. Experimental Example 2 - Cross-section Comparison Test The cross-sections of products cut using a precision cutting unit equipped with a laser blade (product name: Diamaze) according to Example 1 and a slitter equipped with a conventional rotary knife according to Comparative Example 1 were compared. The results of the comparison are shown in Fig. 10. As shown in Fig. 10, when the precision cutting unit of Example 1 was used, a clean cross-section was shown, whereas the product using the slitter equipped with a rotary knife of Comparative Example 1 showed an uneven cross-section. The cross-sections of products cut using a precision cutting unit equipped with a laser blade (product name: Diamaze) according to Example 1 and a slitter equipped with a conventional rotary knife according to Comparative Example 1 were compared and shown in SEM photographs. The results of the comparison are shown in Fig. 11.As shown in Fig. 11, when the precision cutting part according to Example 1 was used, both the Air Side and the Drum Side showed clean cross-sections, whereas when the slitter equipped with a rotary knife according to Comparative Example 1 was used, both cross-sections were found to be non-uniform. Experimental Example 3 - Oxidation Test according to Passivation The product (without passivation on the side of the copper foil) to which the conventional technology according to Comparative Example 1 (Figs. 1 and 2) was applied and the product (with passivation on the copper foil surface) to which the device and method according to Example 1 (Figs. 3 and 4) were applied were compared to see how they changed over time. This experiment was conducted using a humidity chamber. The temperature of the chamber was set to 85° C., the humidity was set to 85%, and any changes in the two surfaces were observed for a certain period of time. The results are shown in Fig. 12. As a result of the experiment, no changes were observed in the product (a product with passivation treatment on the copper foil side) to which the device and method according to Example 1 (Figs. 3 and 4) were applied. That is, no oxidation occurred at all on the passivation-treated surface even after 4 hours. It was confirmed that the surface was protected from oxidation thanks to the passivation treatment. On the other hand, on the surface of the product (a state in which the copper foil side was not passivated) to which the prior art according to Comparative Example 1 (Figs. 1 and 2) was applied, oxidation began to occur after 30 minutes. That is, the surface reacted with oxygen and deformed. It can be seen that the passivation-treated surface did not oxidize over time, whereas the non-passivation surface began to oxidize within a short period of time. Through this, it can be seen that the copper foil product produced according to an example of the manufacturing device and manufacturing method of the present invention exhibits excellent oxidation stability because the passivation is maintained. Explanation of drawing symbols.

[0010] 10: Drums

[0011] 20: Peeling filter

[0012] 30: Precision cutting section

[0013] 31: Upper knife

[0014] 32: Lower roller

[0015] 33: External tension change buffer

[0016] 34: Vibration resistance reinforced section

[0017] 35: Laser blade adjustment section

[0018] 40: Passivation bath (pass i vat i on bath)

[0019] 50: SQ roller

[0020] 60, 70: Dryer

[0021] 80: Winding section

[0022] 90: Trimmed copper foil

[0023] 100: Trim winding part

[0024] 110: Copper foil manufacturing device

Claims

[CLAIMS]

1. A copper foil manufacturing device comprising a drum for forming copper foil from copper ions deposited from an electrolytic cell, a peeling roller for peeling the copper foil deposited on the surface of the drum, a precision cutting unit including a razor blade for precisely cutting the copper foil, and a winding unit for winding the precisely cut copper foil.

2. A copper foil manufacturing device, further comprising a rust prevention treatment section for preventing oxidation of the copper foil in claim 1.

3. A copper foil manufacturing device according to claim 1, wherein the precision cutting section further includes an external tension change buffer section that buffers external tension change when cutting with the laser blade to maintain cutting quality.

4. A copper foil manufacturing device according to claim 1, wherein the precision cutting section further includes a vibration resistance reinforcing section that minimizes vibration of the laser blade and strengthens resistance to vibration when cutting with the laser blade.

5. A copper foil manufacturing device according to claim 1, wherein the precision cutting part can perform cutting in a point cutting manner.

6. A copper foil manufacturing device according to claim 1, wherein the precision cutting section additionally includes a lower roller.

7. A copper foil manufacturing device according to claim 6, wherein the precision cutting section additionally includes a contact nip roller that contacts the lower roller to control the pressing strength and conveying rate of the copper foil.

8. A copper foil manufacturing device according to claim 1, wherein the precision cutting part further includes a laser blade adjustment part.

9. In claim 1, the high-quality inspection section of the copper foil that has passed through the winding section includes a quality inspection section that inspects quality including quality inspection of the edge of the precisely cut copper foil, and

10. In claim 1, a copper foil manufacturing device further includes a control system that controls the copper foil of the foil making machine.

11. A copper foil manufacturing device further comprising a quality inspection unit for inspecting the quality of the precisely cut copper foil in the first paragraph.

12. A method for manufacturing copper foil, comprising: a step of forming a copper foil on a drum by depositing copper ions from an electrolytic cell; a step of peeling the deposited copper foil from the drum surface; a step of precisely cutting the peeled copper foil using a precision cutting section including a razor blade; and a step of winding the precisely cut copper foil.

13. A method for manufacturing copper foil, further comprising a rust prevention treatment step after the precision cutting step in claim 12.

14. A method for manufacturing copper foil according to claim 12, wherein the precision cutting step further includes a step of maintaining cutting quality by buffering external tension changes.

15. In claim 12, the precision cutting step minimizes the vibration of the upper knife and A method for manufacturing copper foil, comprising an additional step of strengthening the resistance.

16. A method for manufacturing copper foil according to claim 12, wherein the precision cutting step is a step performed by a point cutting method.

17. A method for manufacturing copper foil, further comprising a quality inspection step of inspecting the quality of the copper foil before the copper foil winding step and after the precision cutting step in claim 12.

18. A precision cutting machine for manufacturing copper foil, comprising: an upper knife positioned at the top for precisely cutting copper foil and including a laser blade; a lower roller positioned at the bottom for transporting copper foil thereon and cutting it by the laser blade; an external tension change buffering unit that contacts the lower roller to buffer external tension change occurring during cutting to maintain cutting quality; and a vibration resistance reinforcing unit that fixes the upper knife to minimize vibration.

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