Electrolytic copper foil continuous preparation device and preparation method thereof

Abstract

The invention relates to the technical field of electrolytic copper foil preparation, and discloses an electrolytic copper foil continuous preparation device and a preparation method thereof.The electrolytic copper foil continuous preparation device comprises a flowing electrolytic bath, a circulating cathode belt, a fixed anode and a cathode driving device; the circulating cathode belt and the fixed anode are at least partially parallel and opposite, and are at least partially arranged in the flowing electrolytic bath; the cathode driving device is used for supporting and driving the circulating cathode belt to do circulating reciprocating motion; the cathode driving device comprises a driving roller, a driven roller and a conductive tensioning roller; the circulating cathode belt is supported by triangular point positions of the driving roller, the driven roller and the conductive tensioning roller to form an annular cathode surface; the driving roller is used for driving the circulating cathode belt to perform circulating circumferential operation, and the conductive tensioning roller provides a conductive path and tension adjustment for the circulating cathode belt. The circulating cathode belt is used as the cathode, so that the device has the advantages of small occupied space and flexibility and continuity in operation; the design of the conductive tensioning roller can improve the problems that the cathode belt is unstable in circulating operation and cannot conduct large current.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic copper foil preparation, and in particular to a continuous preparation device and a preparation method of electrolytic copper foil. Background Art

[0002] Electrolytic copper foil is produced by depositing copper ions in the electrolyte on the metal cathode by electroplating, and then peeling it off. The preparation process of electrolytic copper foil involves two key processes: copper foil raw foil and post-processing. The raw foil process is to deposit copper ions on the metal cathode to obtain a complete copper layer, and then peel it off from the metal cathode. For the lithium battery copper foil process, especially for the continuous and efficient raw foil preparation, high current density of 50-70 (A / dm2) and high speed of 6-10m / min (i.e., copper foil winding line speed) are usually required. However, high current density inevitably requires: the electrolyte needs a higher technical ion concentration to ensure sufficient conductivity; at the same time, the copper ions on the electrode surface can be replenished with timely fluidity to ensure the timely exchange of the electrode surface material and the electrolyte body material. Therefore, in order to improve the mass transfer effect of the electrolyte in the existing process, it is necessary to design the electrolytic cell into a flowing type or the cathode is mobile.

[0003] Since the raw foil needs to be peeled off from the metal cathode after the production process, the copper foil is required to have sufficient integrity and thickness from the perspective of product quality control. The continuously running electroplating machine is conducive to obtaining a continuous and complete long roll of copper foil. Therefore, the traditional copper foil raw foil machine in actual production is a continuous electrodeposition on a rotating solid cathode roller. However, in the laboratory stage, due to space and funding constraints, a small flat-plate electroplating device is usually used; however, since flat-plate electroplating can neither achieve the preparation of continuous copper foil nor achieve good copper deposition under high current density, it greatly affects the consistency of the developed copper foil process from the laboratory stage to the production scale-up process. Therefore, it is crucial to develop an electroplating equipment that can maintain process consistency from the experimental research stage to the production scale-up stage for the improvement of copper foil preparation technology. Summary of the invention

[0004] In view of this, the present invention provides an electrolytic copper foil continuous preparation device and a preparation method thereof, which can effectively solve the problem that the process formula of the electrolytic copper foil needs to go through small-scale tests, pilot tests and scaled-up production before production, and secondary development is required due to large equipment differences, resulting in low R&D efficiency.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A continuous preparation device for electrolytic copper foil, characterized in that it includes a flowing electrolytic cell, a circulating cathode belt, a fixed anode and a cathode driving device; the circulating cathode belt is at least partially parallel to the fixed anode and is at least partially placed in the flowing electrolytic cell; the cathode driving device is used to support and drive the circulating cathode belt for circumferential motion; the cathode driving device includes an active roller, a driven roller and a conductive tensioning roller; the circulating cathode belt is supported by the triangular points of the active roller, the driven roller and the conductive tensioning roller to form an annular cathode surface; the active roller is used to drive the circulating cathode belt to perform circumferential motion, and the conductive tensioning roller is used to provide a conductive path and tension adjustment for the circulating cathode belt.

[0007] Optionally, the flow electrolytic cell comprises a liquid separation tank, an electrolytic tank, an overflow tank, a liquid separation plate and an overflow plate; the liquid separation plate is arranged between the liquid separation tank and the electrolytic tank, and the overflow plate is arranged between the electrolytic tank and the overflow tank;

[0008] The electrolyte flows in through the liquid inlet on one side of the liquid separation tank, flows through the liquid separation tank, the liquid separation plate, the electrolytic tank, the overflow plate and the overflow tank in sequence, and finally flows out through the liquid outlet on one side of the overflow tank.

[0009] Optionally, the electrolytic cell is located above the liquid separation cell, and the liquid separation plate includes a plurality of evenly distributed, vertically upward overflow holes.

[0010] Optionally, the active roller is electrically connected to the driving motor through an elastic coupling to drive the active roller to rotate.

[0011] Optionally, the active roller is located above the driven roller; in the vertical direction, the conductive tension roller is located between the active roller and the driven roller.

[0012] Optionally, the copper foil preparation device further includes a metal belt layer, an insulating layer and a friction backing layer stacked in sequence; when the metal belt layer is parallel to the fixed anode, the metal belt layer is located on the side of the insulating layer close to the fixed anode. On the side facing away from the anode, that is, at the position of the conductive tensioning roller, an M-shaped metal sheet passes through the metal belt layer and the insulating layer, and is closely attached to the back of the metal belt layer, for contacting the back of the metal belt and connecting the conductive tensioning roller.

[0013] Optionally, the copper foil preparation device also includes an M-shaped metal sheet, the middle part of which passes through the metal strip layer and the insulating layer and contacts the back side of the metal strip layer; the end of the M-shaped metal sheet contacts and is movably connected to the conductive tensioning roller; the M-shaped metal sheet is used to electrically connect the circulating cathode strip and the conductive tensioning roller.

[0014] Optionally, the friction backing includes an uneven surface for increasing the friction force with the roller surface.

[0015] Optionally, the copper foil preparation device also includes a fixed bracket, which includes a T-shaped perforated frame, a locking device and a spring; the T-shaped perforated frame is used to install a conductive tensioning roller, and the locking device passes through the T-shaped perforated frame and is movably connected to the spring to achieve adjustment of the height of the T-shaped perforated frame.

[0016] Optionally, it also includes an electrolyte circulation flow path, which includes a liquid pump, a constant temperature liquid storage tank, a filter, an inlet valve and an outlet valve; the liquid outlet of the electrolytic cell is connected to the constant temperature liquid storage tank via the outlet valve.

[0017] Optionally, it also includes a heating control device and / or a filter, and the filter is arranged between the liquid pump and the liquid inlet valve; the heating control device is used to control the temperature of the constant temperature liquid storage tank, and the filter is used to remove impurities from the electrolyte.

[0018] Optionally, a copper foil winding system is included, the copper foil winding system also includes a copper foil winding system, the copper foil winding system includes a cleaning tank and / or an anti-oxidation tank and / or an air knife arranged between a traction guide roller and a winding guide roller;

[0019] The cleaning tank is used to remove the residual electrolyte on the surface of the copper foil; the anti-oxidation tank is used to cover the copper foil with an anti-oxidation layer; the air knife is used to blow dry the anti-oxidation liquid on the surface of the copper foil.

[0020] The present invention adopts a circulating cathode belt as a cathode, and the circumferential circulation of the circulating cathode belt is beneficial to prevent the partial electroplated copper foil area on the cathode belt immersed in the electrolyte from being burned due to excessive current density when a large current is applied to the two electrodes during electrolysis. Compared with the traditional cathode roller, the circulating cathode belt has the advantages of small footprint, simple structure, small size and flexible operation, and does not require expensive and heavy cathode rollers. Through the unique design of the circulating cathode belt and the conductive tensioning roller, the problem of single-sided electroplating and back-side conductivity of the traditional cathode roller as an electrode is solved; the combination of the circulating cathode belt and the mobile electrolytic cell is also beneficial to enhance the mass transfer on the electrode surface and timely replenish the consumed electrolyte ions, which is more conducive to the generation of copper foil products with uniform thickness and texture. At the same time, the device system can be used in the laboratory stage, and can be proportionally modified with the continuous electroplated copper foil amplification system required in industrial production, which can effectively solve the problem of low R&D efficiency caused by the large equipment differences and the need for secondary development in the process formula of electrolytic copper foil before production, which needs to be tested in small-scale and pilot-scale to amplified production.

[0021] In a second aspect, the present application further provides a method for continuously preparing an electrolytic copper foil, using the electrolytic copper foil preparation device of any one of the first aspects above, comprising:

[0022] S1: In the preparation stage, the electrolyte preheated to a set temperature is injected into the flow electrolytic cell, the rising speed of the electrolyte in the flow electrolytic cell is adjusted to a set value, and the cathode drive device is turned on and its rotation speed is adjusted to a set value;

[0023] S2: Electroplating stage: A set current value is transmitted to a current loop consisting of a circulating cathode belt and a fixed anode through a conductive tension roller, so that the thickness of the copper foil generated on the circulating cathode belt reaches a set value.

[0024] S3: Winding stage: After the copper foil of the cathode tape is peeled off, it passes through the pulling guide roller 1, the cleaning tank, the pulling guide roller 2, the anti-oxidation tank, and the wind knife in sequence, fixes the end of the copper foil on the winding guide roller, starts the electric control device connected to the winding guide roller, adjusts the winding speed, and rewinds the peeled copper foil.

[0025] Since the device for continuously preparing electrolytic copper foil provided in the first aspect has the above-mentioned technical effects, the method for continuously preparing electrolytic copper foil should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 An overall schematic diagram of an electrolytic copper foil preparation device provided by the present invention;

[0028] Figure 2 for Figure 1 A local enlarged schematic diagram of the Q region is shown;

[0029] Figure 3 A schematic diagram of a laminated structure of a circulating cathode belt provided by the present invention;

[0030] Figure 4 A schematic structural diagram of a flow electrolytic cell provided by the present invention;

[0031] Figure 5 A schematic diagram of the structure of the liquid separation plate provided by the present invention;

[0032] Figure 6 A schematic diagram of an assembly of a circulating cathode belt and an M-shaped metal sheet provided by the present invention;

[0033] Figure 7 for Figure 1 A schematic diagram of the cross-sectional structure along the AA' direction is shown;

[0034] Figure 8 A structural schematic diagram of a fixing bracket provided by the present invention;

[0035] Fig. 9A schematic side view of a cathode driving device provided by the present invention.

[0036] The following are marked in the accompanying drawings:

[0037] Flowing electrolytic cell 100, cathode driving device 2000, fixed anode plate 300; cell body 11, liquid inlet 111; liquid outlet 112; anode support 113; liquid pump 400; liquid inlet valve 401; liquid outlet valve 402; filter 403; constant temperature liquid storage tank 500; heating control device 600; filter 700; cleaning tank 800; anti-oxidation tank 900; wind knife 1000; winding roller 1100; traction guide roller 1200; liquid separation tank 101; electrolytic cell 10 2; overflow tank 103; liquid separation plate 104; overflow plate 105; active roller 201; driven roller 202; conductive tensioning roller 203; liquid separation hole 1041; circulating cathode belt 200; metal belt layer 2001; insulating layer 2002; friction backing 2003; M-shaped metal sheet 2004; mounting hole 2005; T-shaped perforated frame 2031, bolt 2032; gasket 2033; spring 2034; nut 2035; support hole 2036; locking hole 2037. DETAILED DESCRIPTION

[0038] The embodiment of the present invention discloses an electrolytic copper foil preparation device and a continuous preparation method to solve the problem that the electrolytic copper foil process formula needs to go through small-scale test and pilot test before production, and that secondary development is required during scale-up production due to large equipment differences, resulting in low R&D efficiency.

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The present invention provides the following technical solution:

[0041] A device for continuously preparing electrolytic copper foil comprises a flowing electrolytic cell, a circulating cathode belt, a fixed anode and a cathode driving device; the circulating cathode belt is at least partially parallel to the fixed anode and is at least partially placed in the flowing electrolytic cell; the cathode driving device is used to support and drive the circulating cathode belt for circumferential movement; the cathode driving device comprises an active roller, a driven roller and a conductive tensioning roller; the circulating cathode belt is supported by the triangular points of the active roller, the driven roller and the conductive tensioning roller to form an annular cathode surface; the active roller is used to drive the circulating cathode belt to perform circumferential movement, and the conductive tensioning roller is used to provide a conductive path and tension adjustment for the circulating cathode belt.

[0042] Specifically, see Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 An overall schematic diagram of an electrolytic copper foil preparation device provided by the present invention; Figure 2 for Figure 1 A local enlarged schematic diagram of the Q region is shown; Figure 3 A schematic diagram of a laminated structure of a circulating cathode belt provided by the present invention; Figure 4 A schematic structural diagram of a flow electrolytic cell provided by the present invention; Figure 5 A schematic diagram of the structure of the liquid separation plate provided by the present invention; Figure 1 to Figure 4 As shown, the electrolytic copper foil preparation device includes a flow electrolytic cell 100, a fixed anode 300, a circulating cathode belt 200 and a cathode driving device 2000; wherein the flow electrolytic cell 100 includes a liquid separation tank 101, an electrolytic cell 102, an overflow tank 103, a liquid separation plate 104 and an overflow plate 107; the liquid separation plate 104 is arranged between the liquid separation tank 101 and the electrolytic cell 102, and the overflow plate 107 is arranged between the electrolytic cell 102 and the overflow tank 103; the electrolyte flows in through the liquid inlet 105 on one side of the liquid separation tank 101, flows through the liquid separation tank 101, the liquid separation plate 104, the electrolytic cell 102, the overflow plate 107 and the overflow tank 103 in sequence, and finally flows out through the liquid outlet 106 on one side of the overflow tank 103. Further, as Figure 5 As shown, the liquid separation plate 104 includes a plurality of evenly distributed, vertically upward liquid separation holes 1041; the circulating cathode belt 200 is at least partially parallel to the fixed anode 300 and at least partially placed in the mobile electrolytic cell 100, and the cathode driving device 2000 is used to support and drive the circulating cathode belt 200 to move in a circular circumferential direction. Among them, the cathode driving device 2000 includes an active roller 201, a driven roller 202 and a conductive tensioning roller 203; the circulating cathode belt 200 is supported by the triangular point of the active roller 201, the driven roller 202 and the conductive tensioning roller 203 to form an annular cathode surface; the surface of the fixed anode 300 is opposite to the cathode surface to form the anode and cathode of the electroplating device. The active roller 201 is electrically connected to the driving motor (not shown in the figure) through an elastic coupling (not shown in the figure), driving the active roller 201 to rotate to drive the circulating cathode belt 200 to move in a circular circumferential direction, and the conductive tensioning roller 203 is used to provide a conductive path and tension adjustment for the circulating cathode belt 200.

[0043] In the present invention, a circulating cathode belt 200 is used as a cathode, and a fixed anode plate 300 is used as an anode. The circumferential movement of the circulating cathode belt 200 is beneficial to prevent the partial electroplated copper foil area on the circulating cathode belt 200 immersed in the electrolyte from being burned due to excessive current density when a large current is applied to the two electrodes during electrolysis. Compared with the traditional cathode roller, the circulating cathode belt 200 has the advantages of small footprint, simple structure, small size and flexible operation, and does not require expensive and heavy cathode rollers; the unique design of the circulating cathode belt 200 and the conductive tensioning roller 203 solves the problem of single-sided electroplating and back-side conduction of the traditional cathode roller as an electrode; the combination of the circulating cathode belt 200 and the mobile electrolytic cell 100 is also beneficial to enhance the mass transfer on the electrode surface and timely replenish the consumed electrolyte ions, which is more conducive to the production of copper foil products with uniform thickness and texture. At the same time, the device system can be used in the laboratory stage, and can be proportionally modified with the continuous electroplating copper foil amplification system required for industrial production. It can effectively solve the problem of low R&D efficiency caused by the large equipment differences in the electrolytic copper foil process formula before production, which requires secondary development.

[0044] In some optional embodiments, such as Figure 1 and Figure 2 As shown, the active roller 201 is located above the driven roller 202; in the vertical direction, the conductive tension roller 203 is located between the active roller 201 and the driven roller 202. The active roller 201 and the driven roller 202 are mainly used to pull the two ends of the circulating cathode belt 200. The conductive tension roller 203 is set between the active roller 201 and the driven roller 202. By adjusting the position of the conductive tension roller 203, the tension on the circulating cathode belt 200 between the active roller 201 and the driven roller 202 can be easily adjusted.

[0045] In some optional embodiments, please continue to refer to Figure 5 As shown, the aperture of the separation hole 1041 on the separation plate 104 is between 2 mm and 10 mm, and more preferably between 4 mm and 7 mm; this is because if the aperture of the separation plate 104 is too small, the liquid application speed will be reduced, and if the aperture of the separation plate 104 is too large, the liquid cannot be separated uniformly.

[0046] In some optional embodiments, the electrolyte flow channel between the electrolytic cell 102 and the overflow tank 103 is located between the upper edge of the overflow plate 107 and the upper top wall of the electrolytic cell; to achieve effective electrolyte flow, the distance between the upper edge of the overflow plate 107 and the upper top wall of the electrolytic cell 102 must be greater than or equal to 3 cm and less than or equal to 15 cm; when the distance is too close, due to factors such as the surface tension of the electrolyte, it is difficult for the electrolyte to overflow from the electrolytic cell 102 to the overflow tank 103; when the distance is too large, it will not only increase the volume of the overall structure, but also cause inconvenience in operation.

[0047] In some optional embodiments, Figure 6 A schematic diagram of an assembly of a circulating cathode belt and an M-shaped metal sheet provided by the present invention, Figure 7 for Figure 1 The schematic diagram of the cross-sectional structure along the AA' direction is shown; Figure 3 , Figure 6 and Figure 7 As shown, the circulating cathode belt 200 includes a metal belt layer 2001, an insulating layer 2002 and a friction backing 2003 which are stacked in sequence; when the metal belt layer 2001 is parallel to the fixed anode 300, the metal belt layer 2001 is located on the side of the insulating layer 2002 close to the fixed anode 300. On the side facing away from the anode, i.e., at the position of the conductive tension roller 203, there is an M-shaped metal sheet 2004 which passes through the metal belt layer 2001 and the insulating layer 2002 and is closely attached to the back of the metal belt layer 2001, and is used to contact the back of the metal belt and connect the conductive tension roller 203, and realize the electrical connection between the two. The cathode of the external power supply is electrically connected to the conductive tension roller 203, and is transmitted to the metal belt layer 2001 through the M-shaped metal sheet 2004.

[0048] Further optionally, the friction backing 2003 includes an uneven surface for increasing the friction with the roller surface; specifically, the surface of the friction backing 2003 is a wavy pattern. In other deformable embodiments, other patterns such as convex dots, squares, meshes, etc. may also be used, and this application does not impose specific restrictions.

[0049] Further, the thickness of the metal belt layer 2001 in the circulating cathode belt 200 is 0.02-0.2 mm, and more preferably 0.05-0.1 mm; this is because the metal belt layer 2001 has bending stress. When the thickness of the metal belt layer 2001 is greater than a certain value, huge bending stress will be generated, and it will not be able to be smoothly bent and circulated. When the thickness of the metal belt layer 2001 is too thin, it will not be able to be processed into a ring, and it is easy to break during operation. In some specific embodiments, when the active roller 201 is a 20 mm diameter roller, a 0.05 mm thick cathode belt is used for operation. In other embodiments, when the active roller 201 is a 50 mm diameter roller, a 0.2 mm thick cathode belt is used for operation, and the metal cathode belt runs smoothly. In some other embodiments, when the active roller 201 is a 20 mm diameter roller, a 0.08 mm thick circulating cathode belt is used for operation, and the circulating cathode belt runs smoothly and can run continuously for more than 10 hours.

[0050] In some optional embodiments, Figure 8 A structural schematic diagram of a fixing bracket provided by the present invention; Fig. 9 A side view schematic diagram of a cathode driving device provided by the present invention, such as Figure 6 , Figure 8 and Fig. 9As shown, the cathode driving device 2000 also includes an M-shaped metal sheet 2004, the middle part of which passes through the metal belt layer 2001 and the insulating layer 2002 and contacts the back side of the metal belt layer 2001; the end of the M-shaped metal sheet 2004 contacts and movably connects with the conductive tensioning roller 203 through the mounting hole 2005; the M-shaped metal sheet 2004 is used to electrically connect the circulating cathode belt 200 and the conductive tensioning roller 203.

[0051] In some optional embodiments, please continue to refer to Figure 7 As shown, the conductive tensioning roller 203 is supported and fixed by a fixed bracket, which includes a T-shaped perforated frame 2031, a locking device 2032 / 2035 and a spring 2034. The transverse bracket of the T-shaped perforated frame 2031 includes a locking hole 2037, and the longitudinal bracket includes a support hole 2036. The support hole 2036 is used to install the conductive tensioning roller 203. The locking device 2032 / 2035 includes a bolt 2032 and a nut 2033. The spring 2034 is sleeved on the bolt 2032. The bolt 2032 passes through the locking hole and engages with the nut 2033. The T-shaped perforated frame 2031 is raised and lowered by compressing the spring 2034 and the locking device 2032 / 2035, thereby realizing the adjustment of the tension of the conductive tensioning roller 203 on the circulating cathode belt 200. Furthermore, a gasket 2033 is provided outside the locking hole 2037 of the T-shaped perforated frame 2031, and the gasket 2033 is used to prevent the top of the spring 2034 from entering the locking hole 2037. The conductive tension roller 203 has a good adjustment range.

[0052] Further optionally, the wire diameter of the spring 2034 is selected between 0.2 mm and 0.8 mm, which can achieve better amplitude adjustment of the conductive tension roller 203. When the spring 2034 adopts a too thin wire diameter, such as 0.2 mm, the elastic force is too weak and the tension adjustment strength is not satisfied; when the spring 2034 adopts a too thick wire diameter, such as 1 mm, the elastic force is too large and the amplitude range of the tension adjustment is not enough.

[0053] For further information, please refer to Figure 1 The copper foil preparation device also includes an electrolyte circulation flow path, which includes a liquid pump 400, a constant temperature liquid storage tank 500, a filter 700, a liquid inlet valve 401 and a liquid outlet valve 402; the filter 700 is arranged between the liquid pump 400 and the liquid inlet valve 401; the liquid pump 400 is arranged between the constant temperature liquid storage tank 500 and the liquid inlet 105; the electrolytic cell liquid outlet 112 is connected to the constant temperature liquid storage tank 500 via the liquid outlet valve 402, and the filter 700 is connected to the electrolytic cell liquid inlet 111 via the liquid inlet valve 401.

[0054] In some optional embodiments, please continue to refer to Figure 1The electrolyte circulation path also includes a heating control device 600, which is used to control the temperature of the constant temperature liquid storage tank 500.

[0055] In some optional embodiments, please continue to refer to Figure 1 The electrolyte circulation path also includes a filter 403, which is arranged between the liquid pump 400 and the constant temperature liquid storage tank 500. The filtered electrolyte is connected to the liquid inlet 105 via the liquid inlet valve 401; the filter 403 is used to filter particulate impurities in the electrolyte to prevent impurities from being deposited on the surface of the copper foil and causing surface defects.

[0056] For further information, please refer to Figure 1 The copper foil preparation device also includes a copper foil winding system. After the electrolytic copper foil is deposited on the circulating cathode belt 200, it is peeled off from the circulating cathode belt 200 and is post-processed and rolled up by the copper foil rolling system. The specific operation is to be guided by the traction guide roller 1200, introduced into the cleaning tank 800 in sequence, and then passed through the anti-oxidation tank 900, through the hot air knife 1000, and rolled up by the winding roller 1100 driven by the motor. The copper foil rolling system includes the traction guide roller 1200, the cleaning tank 800, the anti-oxidation tank 900 and the air knife 1000; the traction guide roller is used to pull the copper foil to avoid folding; the cleaning tank 800 is used to remove the residual electrolyte on the surface of the copper foil; the anti-oxidation tank 900 is used to cover the copper foil with an anti-oxidation layer; the air knife 1000 is used to blow dry the anti-oxidation liquid on the surface of the copper foil; the winding guide roller 111 is driven by a motor (not shown) to roll up the peeled copper foil.

[0057] The present invention also provides a continuous preparation method of electrolytic copper foil, which is performed using the electrolytic copper foil preparation device provided by the present invention, comprising S1: a preparation stage, injecting an electrolyte preheated to a set temperature into a flow electrolytic cell 100, adjusting the rising speed of the electrolyte in the flow electrolytic cell 100 to a set value, turning on a cathode drive device 2000 and adjusting its rotation speed to a set value;

[0058] S2: Electroplating stage: A set current value is transmitted to the current loop composed of the circulating cathode belt 200 and the fixed anode 300 through the conductive tension roller 203, so that the thickness of the copper foil generated on the circulating cathode belt 200 reaches the set value.

[0059] S3: Winding stage: After the copper foil of the cathode tape is peeled off, it passes through the cleaning tank, the pulling guide roller, the anti-oxidation tank, the pulling guide roller 1200, the wind knife, the pulling guide roller 1200 in sequence, fixes the end of the copper foil on the winding guide roller, starts the electric control device connected to the winding guide roller, adjusts the winding speed, and winds up the peeled copper foil.

[0060] More specifically, in the preparation stage, the electrolyte is first heated to a set temperature; the liquid pump 400 is started to transport the electrolyte in the liquid storage tank to the electrolytic cell 102, and each valve is adjusted to allow the electrolyte to flow smoothly; the liquid inlet valve 401 is adjusted to allow the electrolyte to rise in the electrolytic cell 102 at a set speed. The motor is started to rotate the circulating cathode belt 200, and the speed is adjusted to the set value.

[0061] Electroplating stage: Set the current value, connect the circulating cathode belt 200 to the negative pole of the external power supply, connect the anode plate 300 to the positive pole of the external power supply, and after the copper layer is generated, peel off the part, lead the foil through the cleaning tank, anti-oxidation tank, hot air zone, and fix it on the winding roller, adjust the winding roller speed to be basically synchronized with the cathode belt speed. Further adjust the current and the speed of each motor to the process setting value so that the copper foil thickness reaches the set value.

[0062] Winding stage: Optionally, the rising line speed of the electrolyte in the circulating electrolytic cell is 1m / min to 15m / min; the electrolyte liquid rising speed will greatly affect the supply of copper ions, sulfate ions and other ions on the electrode surface, and also affect the use effect of the additives in the electrolyte. When the rising line speed is less than 1m / min, the surface roughness of the prepared electrolytic copper foil is high and the edges are easily burned due to insufficient liquid supply; when the rising line speed of the electrolyte in the electrolytic cell 102 is greater than 15m / min, it places greater demands on the liquid supply system pump, requiring additional larger interfaces and occupying larger equipment space; further preferably, the rising line speed of the electrolyte is 5m / min-12m / min.

[0063] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0064] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A continuous preparation device for electrolytic copper foil, characterized in that: include: Mobile electrolyzer, circulating cathode belt, fixed anode and cathode drive; The circulating cathode belt is at least partially parallel to the fixed anode and at least partially placed in the flow electrolytic cell; the cathode drive device is used to support and drive the circulating cathode belt to move back and forth; The cathode driving device comprises a driving roller, a driven roller and a conductive tensioning roller; The circulating cathode belt is supported by the triangular points of the active roller, the driven roller and the conductive tensioning roller to form an annular cathode surface; the active roller is used to drive the circulating cathode belt to perform a circular circumferential operation, and the conductive tensioning roller is used to provide a conductive path and tension adjustment for the circulating cathode belt.

2. The device for continuously preparing electrolytic copper foil according to claim 1, characterized in that: The flow electrolytic cell comprises a liquid separation tank, an electrolytic tank, an overflow tank, a liquid separation plate and an overflow plate; the liquid separation plate is arranged between the liquid separation tank and the electrolytic tank, and the overflow plate is arranged between the electrolytic tank and the overflow tank; The electrolyte flows into the liquid separation tank through the liquid inlet on one side, flows through the liquid separation tank, the liquid separation plate, the electrolytic tank, the overflow plate and the overflow tank in sequence, and finally flows out through the liquid outlet on one side of the overflow tank.

3. The device for continuously preparing electrolytic copper foil according to claim 1, characterized in that: The electrolytic cell is located above the liquid separation cell, and the liquid separation plate includes a plurality of evenly distributed and vertically upward overflow holes.

4. The device for continuously preparing electrolytic copper foil according to claim 1, characterized in that: The active roller is electrically connected to the driving motor through an elastic coupling to drive the active roller to rotate.

5. The device for continuously preparing electrolytic copper foil according to claim 1, characterized in that: The active roller is located above the driven roller; in the vertical direction, the conductive tension roller is located between the active roller and the driven roller.

6. The device for continuously preparing electrolytic copper foil according to claim 1, characterized in that: The circulating cathode belt comprises a metal belt layer, an insulating layer and a friction backing which are stacked in sequence; when the metal belt layer is parallel to and opposite to the fixed anode, the metal belt layer is located on a side of the insulating layer close to the fixed anode.

7. The device for continuously preparing electrolytic copper foil according to claim 6, characterized in that: It also includes an M-shaped metal sheet, the middle part of which passes through between the metal belt layer and the insulating layer and directly contacts the back side of the metal belt layer; the end of the M-shaped metal sheet contacts and is movably connected to the conductive tensioning roller; the M-shaped metal sheet is used to electrically connect the circulating cathode belt and the conductive tensioning roller.

8. The device for continuously preparing electrolytic copper foil according to claim 6, characterized in that: The friction backing includes an uneven surface for increasing the friction force with the roller surface.

9. The device for continuously preparing electrolytic copper foil according to claim 6, characterized in that: It also includes a fixed bracket, which includes a T-shaped perforated bracket, a locking device and a spring; the T-shaped perforated bracket is used to install the conductive tensioning roller, and the locking device passes through the T-shaped perforated bracket and is movably connected to the spring to achieve adjustment of the height of the T-shaped perforated bracket.

10. The device for continuously preparing electrolytic copper foil according to claim 2, characterized in that: It also includes an electrolyte circulation flow path, which includes a liquid pump, a constant temperature liquid storage tank, a liquid inlet valve and a liquid outlet valve; the liquid pump is arranged between the constant temperature liquid storage tank and the liquid inlet; the filter is arranged between the liquid pump and the liquid inlet; the liquid outlet is connected to the constant temperature liquid storage tank via the liquid outlet valve.

11. The device for continuously preparing electrolytic copper foil according to claim 10, characterized in that: It also includes a heating control device and / or a filter. The heating control device is used to control the temperature of the constant temperature liquid storage tank; the filter is arranged between the liquid pump and the liquid inlet and is used to remove impurities from the electrolyte.

12. The electrolytic copper foil preparation device according to claim 10, characterized in that: It also includes a copper foil winding system, which includes a cleaning tank and / or an anti-oxidation tank and / or an air knife arranged between a traction guide roller and a winding guide roller; The cleaning tank is used to remove residual electrolyte on the surface of the copper foil; The anti-oxidation tank is used to cover the copper foil with an anti-oxidation layer; The air knife is used to dry the anti-oxidation liquid on the surface of the copper foil.

13. A method for continuously preparing electrolytic copper foil, characterized in that: The device for continuously preparing electrolytic copper foil according to any one of claims 1 to 12 comprises: S1: In the preparation stage, the electrolyte preheated to a set temperature is injected into the flow electrolytic cell, the rising speed of the electrolyte in the flow electrolytic cell is adjusted to a set value, and the cathode drive device is turned on and its rotation speed is adjusted to a set value; S2: Electroplating stage: A set current value is transmitted to a current loop consisting of a circulating cathode belt and a fixed anode through a conductive tension roller, so that the thickness of the copper foil generated on the circulating cathode belt reaches a set value. S3: Winding stage: After the copper foil of the cathode tape is peeled off, it passes through the pulling guide roller 1, the cleaning tank, the pulling guide roller 2, the anti-oxidation tank, and the wind knife in sequence, fixes the end of the copper foil on the winding guide roller, starts the electric control device connected to the winding guide roller, adjusts the winding speed, and rewinds the peeled copper foil.

Images