Control method for ensuring thickness uniformity of copper foil

Abstract

The invention discloses a control method for ensuring the thickness uniformity of a copper foil, and relates to the technical field of copper foil production, which comprises the following steps: outputting the copper foil through the rotation of a cathode roller in an electrolyte pool of a crude foil engine, and respectively arranging a plurality of power supply module groups on two sides of an X axis vertical to a rotating shaft of the cathode roller, the cathode of each power supply module group is electrically connected with the cathode roller, and the anode is electrically connected with the electrolyte tank; respectively monitoring the output current of each power supply module group; and when the output current of one power supply module group is reduced, the other power supply module groups on the same side of the X axis are controlled to increase current output, so that the total output current on the two sides of the X axis is kept to be equal, according to the technical scheme, the output current of each power supply module group is monitored, and when the output current of one power supply module group is reduced, the output current of the other power supply module groups is reduced. Other power supply modules on the same side of the X axis are timely controlled to increase current output, so that the total output current on the two sides of the X axis is always kept equal, and the thickness of produced copper foil is uniform.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of copper foil production, in particular to a control method for ensuring uniform thickness of copper foil. BACKGROUND

[0002] The green foil machine is the core equipment for producing electrolytic copper foil. The electrolytic deposition process of the green foil machine is as follows: the copper sulfate electrolyte continuously flows through the electrolysis area between the anode plate (anode) and the cathode roller (cathode) under the driving of the circulation system; the high-frequency switching power supply provides direct current, and under the action of the electric field, Cu 2+ in the electrolyte migrates to the surface of the cathode roller and is reduced to metal copper (Cu 2 +2e - =Cu) after obtaining electrons, gradually depositing to form copper foil; the cathode roller rotates at a constant speed, and the new surface continuously enters the electrolysis area for deposition, and the deposited copper foil is transferred out of the electrolysis area with the roller body, and then peeled off by the peeling knife and enters the subsequent processing process.

[0003] A green foil machine power supply integrated structure disclosed in Chinese patent document CN217948302U comprises: a green foil machine and a plurality of power module groups, the plurality of power module groups are evenly distributed on the side of the green foil machine, each power module group is arranged at an angle β between the green foil machine, the positive electrode of each power module group is connected with the anode of the green foil machine, and the negative electrode of each power module group is connected with the cathode of the green foil machine.

[0004] In the above scheme, the thickness of the copper foil is determined by the current density (current intensity per unit area) and the rotation speed of the cathode roller: thickness (μm) ≈ (current density × time × electrochemical equivalent of copper) / density of copper, so the target thickness (such as the common thickness of 3-12 μm of lithium battery copper foil) needs to be achieved by accurately controlling the two parameters.

[0005] However, in actual working conditions, the output current of the power module group may vary due to long-term use. For example, when some power module groups are damaged and the power decreases, they may not be able to output the set current. Thus, it is easy to cause the problem of uneven thickness of the produced copper foil. SUMMARY

[0006] Therefore, the present application provides a control method for ensuring uniform thickness of copper foil to solve the problem of uneven thickness of copper foil caused by power reduction of some power module groups.

[0007] The present application provides a control method for ensuring uniform thickness of copper foil, comprising the following steps:

[0008] The copper foil is output by rotating a cathode roller in an electrolyte pool of a foil production machine, a plurality of power module groups are arranged on both sides of an X axis perpendicular to the rotation axis of the cathode roller, the negative pole of each power module group is electrically connected to the cathode roller, and the positive pole is electrically connected to the electrolyte pool.

[0009] The output current of each power module group is monitored.

[0010] When the output current of one power module group decreases, the output current of other power module groups on the same side of the X axis is increased to keep the total output current on both sides of the X axis equal.

[0011] The output current of each power module group is monitored.

[0012] Specifically, in the copper foil production process, the current directly affects the deposition rate of copper ions on the surface of the cathode roller. Therefore, when one power module stops or the power decreases, and the total output current of the power module group is insufficient, the output current of another power module group on the same side of the X axis is increased to keep the total output current on both sides of the X axis equal.

[0013] Optionally, the plurality of power module groups on the same side of the X axis are symmetrically arranged relative to a Y axis coaxial with the rotation axis of the cathode roller. When the output current of one power module group decreases, the output current of another power module group symmetrically arranged relative to the Y axis is increased. In this way, the total output current on both sides of the rotation surface of the cathode roller can be further ensured to be the same. Specifically, since the paths of the currents of the two power module groups symmetrically arranged relative to the Y axis to the cathode roller are the same, the power loss of one power module group can be compensated by the other power module group symmetrically arranged relative to the Y axis, so that the copper foil thickness can be more accurately compensated, and the copper foil thickness on both sides of the X axis can be ensured to be the same.

[0014] Optionally, the lengths of the electric connection loop paths of the two power module groups symmetrically arranged relative to the Y axis are the same.

[0015] Optionally, one power module group is arranged at each corner of the cathode roller.

[0016] Optionally, the power module group has a plurality of power modules arranged side by side, the positive poles of the plurality of power modules are connected by a positive pole plate, and the negative poles are connected by a negative pole plate.

[0017] Optionally, the positive plate has a plurality of positive interfaces.

[0018] Optionally, the number of positive interfaces is greater than the number of power modules.

[0019] Optionally, the number of positive interfaces is greater than or equal to six.

[0020] Optionally, the electrolyte tank of the foil machine has an arc-shaped outer wall with a plurality of anode conductive rows uniformly spaced thereon, the plurality of anode conductive rows are respectively parallel to the rotation axis of the cathode roller, and each positive interface is respectively electrically connected to the middle position of the anode conductive row through a conductive plate.

[0021] Optionally, the outer side of the anode conductive row is connected with a conductive copper row, the conductive copper row has an extension plate abutting the anode conductive row and an electrical connection plate connected to the extension plate, and the electrical connection plate is located at the middle position of the anode conductive row; the positive pole of the power module group has a plurality of electrical connection loops with equal path lengths between the anode conductive row and the negative pole of the power module group.

[0022] Optionally, each group of conductive copper rows has two conductive members symmetrically arranged, wherein the first conductive member has a first electrical connection plate and a first extension plate, the second conductive member has a second electrical connection plate and a second extension plate, the first electrical connection plate and the second electrical connection plate are both located at the middle position of the anode conductive row, and the first extension plate and the second extension plate respectively extend towards opposite directions.

[0023] Optionally, the negative plate has a negative interface through which the negative plate is electrically connected to the cathode roller. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0025] Figure 1 A schematic diagram of a control method for ensuring uniform thickness of copper foil provided by an embodiment of the present application;

[0026] Figure 2 A schematic diagram of another control method for ensuring uniform thickness of copper foil provided by an embodiment of the present application;

[0027] Figure 3 A perspective view of a copper foil production system provided by an embodiment of the present application;

[0028] Figure 4 is a top view of Figure 3

[0029] Figure 5 is a side view of Figure 3

[0030] Figure 6 is a perspective view of one power module in Figure 5

[0031] Figure 7 is a perspective view of one anode conductive bar and conductive copper bar in Figure 5

[0032] Figure 8 is a schematic view showing multiple electrical connection loops in Figure 4

[0033] BRIEF DESCRIPTION OF DRAWINGS

[0034] 1, electrolyte tank; 2, cathode roller; 3, power module group; 4, power module; 5, positive plate; 6, negative plate; 7, positive pole; 8, negative pole; 9, anode conductive bar; 10, conductive plate; 11, first conductive member; 12, first electrical connection plate; 13, first extension plate; 14, second conductive member; 15, second electrical connection plate; 16, second extension plate. DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0036] In the description of the present application, it should be noted that the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer” and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms “first”, “second”, “third” are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0037] ​​​​​In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be direct connection, or indirect connection through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the application described below can be combined with each other as long as there is no conflict between them.

[0039] As Figure 1 The embodiment of the control method for ensuring the uniformity of the thickness of the copper foil provided by the present embodiment includes the following steps:

[0040] The copper foil is output by the rotation of the cathode roller 2 in the electrolyte pool 1 of the foil machine, and a plurality of power module groups 3 are arranged on both sides of the X axis perpendicular to the rotation axis of the cathode roller 2, and the negative electrode of each power module group 3 is electrically connected with the cathode roller 2, and the positive electrode is electrically connected with the electrolyte pool 1.

[0041] The output current of each power module group 3 is monitored respectively.

[0042] When the output current of one of the power module groups 3 decreases, the current output of the other power module groups 3 on the same side of the X axis is increased to keep the total output current on both sides of the X axis equal.

[0043] The technical scheme of the present embodiment, by monitoring the output current of each power module group 3, when the output current of one of the power module groups 3 decreases, timely controlling the other power module groups 3 on the same side of the X axis to increase the current output, can ensure that the total output current on both sides of the X axis is always kept equal, and the uniformity of the thickness of the copper foil produced is ensured.

[0044] Specifically, since the size of the current directly affects the deposition rate of copper ions on the surface of the cathode roller 2 during the production of the copper foil, when one power module 4 is shut down or the power is reduced, and the total output current redundancy of the power module group 3 is not enough, resulting in less current than other groups of modules, the missing current can be supplemented by another group of power module groups 3 on the same side of the X axis, so as to ensure that the current on both sides of the X axis is equal, and the density uniformity of the copper foil produced is ensured.

[0045] For example, the total current of each power module group 3 is 48kA, and each power module group 3 is 12kA. When one power module group 3 can only output 10kA due to some reasons, the total current of this side is 2kA less than that of the other side. The 2kA is supplemented by the power module group 3 on the same side of the X axis, so that the other power module groups 3 on the same side of the X axis output 14kA. In this way, the total current output on both sides of the rotating surface of the cathode roller 2, that is, on both sides of the X axis, is still the same. As shown in Figure 4 the figure, it is assumed that the cathode roller 2 rotates from top to bottom. Initially, the current on the upper left side of the X axis is less than that on the lower left side of the X axis, so the copper foil on the upper side of the X axis is thinner than that on the lower side. However, when the cathode roller 2 rotates to the bottom, the current on the upper right side of the X axis is greater than that on the lower right side, so the upper side is increased more than the lower side. In this way, when the copper foil leaves the cathode roller 2, the thickness of the copper foil on both sides of the X axis is the same.

[0046] That is, the control method provided by the present embodiment ensures the uniformity of the thickness of the copper foil. By monitoring the output current of each power module group 3 in real time, if it is found that the output current of a certain power module group 3 decreases and the current redundancy is not enough, the output current of the other power module groups 3 on the same side of the X axis is immediately increased to maintain the total current output on both sides of the X axis equal. Because the current determines the deposition rate of copper ions on the surface of the cathode roller 2, the equal total current on both sides of the X axis ensures that the deposition rate of copper ions on both sides of the X axis of the cathode roller 2 is consistent, thereby ensuring that the thickness of the produced copper foil is uniform and the area density is consistent.

[0047] As shown in Figure 2 some embodiments, the plurality of power module groups 3 on the same side of the X axis are symmetrically arranged with respect to the Y axis coaxial with the rotating shaft of the cathode roller 2. When the output current of one power module group 3 decreases, the output current of another power module group 3 on the same side of the X axis and symmetrically arranged with respect to the Y axis is controlled to increase accordingly.

[0048] That is, the plurality of power module groups 3 on the same side of the X axis are symmetrically arranged with respect to the Y axis coaxial with the rotating shaft of the cathode roller 2. When the output current of one power module group 3 decreases, the output current of another power module group 3 on the same side of the X axis and symmetrically arranged with respect to the Y axis is controlled to increase accordingly.

[0049] In this way, the total current output from the two sides of the X-axis of the cathode roller 2 can be further ensured to be the same. Specifically, since the current reaching the cathode roller 2 from the two power module groups 3 symmetrical with respect to the Y-axis has the same loop path, the power loss of one power module group 3 can be supplemented by the other power module group 3 symmetrical with respect to the Y-axis, so that the copper foil thickness can be more accurately supplemented, and the copper foil thickness on the two sides of the X-axis can be ensured to be the same. That is, since the two power module groups 3 symmetrical with respect to the Y-axis have high similarity in the current effect on the corresponding area of the cathode roller 2, the surface current distribution of the cathode roller 2 can be quickly and accurately restored to balance when the current is abnormal.

[0050] As shown in Figure 3 , Figure 4 In some embodiments, the lengths of the loop paths of the positive electrodes of the two power module groups 3 symmetrical with respect to the Y-axis to the electrolyte pool 1 are the same. That is, the two power module groups 3 are symmetrical with the rotation axis of the cathode roller 2, that is, the Y-axis, as the symmetry axis, and the lengths of the loop paths of the positive electrodes of the two power module groups 3 to the electrolyte pool 1 and the loop paths of the negative electrodes to the cathode roller 2 are the same.

[0051] In some embodiments, the lengths of the loop paths of the positive electrodes of the two power module groups 3 symmetrical with respect to the Y-axis to the electrolyte pool 1 are the same. That is, the two power module groups 3 are symmetrical with the rotation axis of the cathode roller 2, that is, the Y-axis, as the symmetry axis, and the lengths of the loop paths of the positive electrodes of the two power module groups 3 to the electrolyte pool 1 and the loop paths of the negative electrodes to the cathode roller 2 are the same.

[0052] In this way, the deposition rates of copper ions on the surface of the cathode roller 2 at symmetrical positions can be ensured to be basically the same during the production of the copper foil, which helps to improve the uniformity of the copper foil thickness.

[0053] In some embodiments, the lengths of the loop paths of the negative electrodes of the two power module groups 3 symmetrical with respect to the rotation axis of the cathode roller 2, that is, the Y-axis, to the cathode roller 2 are the same. That is, the two power module groups 3 are symmetrical with the rotation axis of the cathode roller 2 as the symmetry axis, and the lengths of the loop paths of the negative electrodes of the two power module groups 3 to the cathode roller 2 are the same.

[0054] Since the resistance, inductance and other characteristics of the current in the loop path are mainly determined by factors such as the length of the loop path and the material of the wire, the same length of the loop path means that the current is affected by the same factors. This ensures the consistency of the current delivered by the power module groups 3 at symmetrical positions to the cathode roller 2, and further ensures that the deposition rates of copper ions on the cathode roller 2 at symmetrical positions are the same.

[0055] In this way, in the process of producing the copper foil, the problem of uneven thickness of the copper foil caused by current difference can be eliminated, the uniformity of the overall area density of the copper foil can be improved, and the quality of the produced copper foil is more stable, and the performance requirements in subsequent electronic circuit manufacturing and other applications can be better met.

[0056] As shown in FIG. 1, Figure 4 In some embodiments, each of the four corners of the cathode roller 2 has one power module group 3. In this way, more uniform current coverage on the surface of the cathode roller 2 can be achieved. Since the four corners are relatively dispersed and symmetrically distributed, the current flows from these four points to the cathode roller 2, which can ensure the uniformity of the current density on the surface of the cathode roller 2 to a greater extent. In the process of producing the copper foil, uniform current density helps the copper ions to be uniformly deposited on the surface of the cathode roller 2, thereby improving the consistency of the thickness of the copper foil.

[0057] As shown in FIG. 1, Figure 5 , Figure 6 In some embodiments, the power module group 3 has a plurality of power modules 4 arranged side by side, the positive poles of the plurality of power modules 4 are connected by a positive pole plate 5, and the negative poles are connected by a negative pole plate 6. That is, the power module group 3 is composed of a plurality of power modules 4 arranged side by side in the height direction. The positive poles of these power modules 4 are connected to each other by one positive pole plate 5, and the negative poles are connected to each other by one negative pole plate 6.

[0058] In this way, the number of power modules 4 can be increased in a limited space. More power modules 4 mean more power reserves and stronger power supply capacity. In the process of producing the copper foil, higher power supply capacity can ensure that the cathode roller 2 is provided with stable and sufficient current, meet the electrical energy required for efficient deposition of copper ions on the surface of the cathode roller 2, and help to improve the production efficiency and quality of the copper foil.

[0059] As shown in FIG. 1, Figure 5 , Figure 6 In some embodiments, the positive pole plate 5 has a plurality of positive pole interfaces 7, and the number of the positive pole interfaces 7 is greater than the number of the power modules 4. In this way, the output of a plurality of positive poles can be achieved by a small number of power modules 4, thereby increasing the number of current output and improving the uniformity of current distribution.

[0060] Specifically, in the present embodiment, each power module group 3 has three power modules 4 and eight positive pole interfaces 7. Of course, the above description is not limiting, and in some alternative embodiments, the number of power modules 4 can also be two or more, and the number of positive pole interfaces 7 can also be other numbers, such as six, ten, etc.

[0061] As shown in FIG. 1, Figure 5As shown, in some embodiments, the electrolyte tank 1 of the green foil machine has an arc-shaped outer wall, and a plurality of anode conductive rows 9 are uniformly and evenly spaced on the arc-shaped outer wall, and the plurality of anode conductive rows 9 are parallel to the rotation axis of the cathode roller 2, and each positive electrode interface 7 is electrically connected to the middle position of the anode conductive row 9 through the conductive plate 10. The positive electrode of the power module group 3 has a plurality of electric connection loops with equal path lengths between the positive electrode and the negative electrode of the power module group 3. In this way, the density of all currents along the extension direction of the anode conductive row 9 is uniform, thereby ensuring the uniformity of the copper foil thickness. Figure 8 As shown, since any point of the anode conductive row 9 reaches the cathode roller 2 through the electrolyte perpendicular to the anode conductive row 9, there are a plurality of electric connection paths, and each electric connection path can be a section of an electric connection loop. The electric connection loop refers to the total loop from the positive electrode of the power module group 3 to the negative electrode of the power module group 3 through any electric connection path.

[0062] In this embodiment, the positive electrode of the power module group 3 is electrically connected to the middle position of the anode conductive row 9, and the voltage of any point on the anode conductive row 9 reaches the cathode roller 2 through the above-mentioned electric connection path in the output state of the power module group 3, and the electric field received by the copper ions at each point is the same, thereby migrating uniformly to the surface of the cathode roller 2 under the action of the electric field, finally improving the uniformity of the copper foil thickness, reducing the difference in copper foil thickness, and improving the quality of the copper foil product.

[0063] That is, in this embodiment, the outer wall of the electrolyte tank 1 of the green foil machine is arc-shaped. On this arc-shaped outer wall, a plurality of anode conductive rows 9 are evenly and evenly distributed. These anode conductive rows 9 are parallel to the rotation axis of the cathode roller 2. Each positive electrode interface 7 is electrically connected to the middle position of the anode conductive row 9 through the conductive plate 10.

[0064] The middle position refers to the position corresponding to the middle of the width direction of the electrolyte tank 1 along the extension direction of the cathode roller 2. That is, with the width direction of the electrolyte tank 1 along the extension direction of the cathode roller 2 as a reference, the position corresponding to the middle of the anode conductive row 9 is called the middle position.

[0065] In this way, it is helpful to form a more uniform electric field in the electrolyte tank 1. Because the current is uniformly transmitted from the power module group 3 to the middle position of the anode conductive row 9 through the conductive plate 10, the potential of each point of the anode conductive row 9 is relatively balanced, and then a uniform electric field line distribution is formed in the electrolyte region between the cathode roller 2 and the anode conductive row 9. In the process of producing copper foil, a uniform electric field can guide copper ions to move and deposit uniformly to the cathode roller 2, thereby significantly improving the uniformity of the copper foil thickness, reducing the difference in copper foil thickness, and improving the product quality.

[0066] like Figure 7 As shown, in some embodiments, a conductive copper bar is connected to the outside of the anode conductive bar 9. The conductive copper bar includes an extension plate that fits the anode conductive bar 9 and an electrical connection plate connected to the extension plate. The electrical connection plate is located in the middle of the anode conductive bar 9. In other words, each anode conductive bar 9 is provided with a corresponding conductive copper bar. The conductive copper bar includes an extension plate that fits the anode conductive bar 9, and an electrical connection plate is connected in the middle of the extension plate. The electrical connection plate is electrically connected to the positive terminal of the power module group 3.

[0067] Of course, the above description is not restrictive. In some alternative embodiments, the conductive copper busbar can be omitted, and the positive electrode of the power module group 3 can be directly electrically connected to the middle position of the anode conductive busbar 9.

[0068] like Figure 7 As shown, in some embodiments, each group of the conductive copper busbars has two symmetrically arranged conductive members, wherein the first conductive member 11 has a first electrical connection plate 12 and a first extension plate 13, and the second conductive member 14 has a second electrical connection plate 15 and a second extension plate 16, the first electrical connection plate 12 and the second electrical connection plate 15 are connected to each other, and the first extension plate 13 and the second extension plate 16 extend in opposite directions respectively.

[0069] In other words, each set of conductive copper bars consists of two symmetrically arranged conductive members, with the first electrical connection plate 12 and the second electrical connection plate 15 abutting against each other, allowing the current output from the positive terminal of the power module group 3 to be evenly distributed to the two conductive members. Because the first extension plate 13 and the second extension plate 16 extend in opposite directions and abut against the anode conductive bar 9, the current is more evenly distributed across the anode conductive bar 9. This helps to form a more uniform electric field in the electrolyte region between the anode conductive bar 9 and the cathode roller 2, guiding copper ions to more evenly migrate toward and be adsorbed on the cathode roller 2, thereby further improving the uniformity of the copper foil thickness.

[0070] Of course, the above description is not restrictive. In some alternative embodiments, the conductive copper busbar may also be configured to include a single, integral extension plate and an electrical connection plate connected to the middle of the integral extension plate. Alternatively, the first electrical connection plate 12 and the second electrical connection plate 15 of the two conductive members may not be directly adjacent to each other, but rather may be spaced apart.

[0071] like Figure 6As shown, in some embodiments, the negative plate 6 has a negative interface 8, through which the negative plate 6 is electrically connected with the cathode roller 2. In this way, the electrical connection structure between the power module group 3 and the cathode roller 2 is greatly simplified. Compared with the complex mode of multiple interface connections, a single interface reduces the number of connection points, making the circuit layout clearer and more concise. This not only reduces the complexity of wiring, but also reduces the risk of poor contact, short circuit and other faults caused by too many connection points.

[0072] Working principle:

[0073] The control method is based on the influence of current on the deposition rate of copper ions in the production of copper foil. By monitoring and regulating the current of the power module group 3 electrically connected with the cathode roller 2 in the foil maker, the current on both sides of the rotating surface of the cathode roller 2 is ensured to be equal, thereby ensuring the uniform thickness of the copper foil.

[0074] Among them, the cathode roller 2 rotates in the electrolyte pool 1 of the foil maker to output copper foil, and a plurality of power module groups 3 are arranged on both sides of the rotating surface of the cathode roller 2, and these power module groups 3 are electrically connected with the cathode roller 2.

[0075] The output current of each power module group 3 is monitored respectively.

[0076] When the output current of one of the power module groups 3 decreases, the output current of the other power module groups 3 on the same side of the X-axis is increased to keep the total output current on both sides of the X-axis equal.

[0077] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the present application.

Claims

1. A control method for ensuring uniformity of thickness of a copper foil, characterized by, The method comprises the following steps: The copper foil is output by the rotation of the cathode roller (2) in the electrolyte pool (1) of the green foil machine, a plurality of power module groups (3) are arranged on both sides of the X axis perpendicular to the rotation axis of the cathode roller (2), the negative electrode of each power module group (3) is electrically connected with the cathode roller (2), and the positive electrode is electrically connected with the electrolyte pool (1); The output current of each power module group (3) is monitored respectively; When the output current of one power module group (3) decreases, the current output of the other power module groups (3) on the same side of the X axis is increased to keep the total output current on both sides of the X axis equal.

2. The control method of guaranteeing the thickness uniformity of a copper foil according to claim 1, characterized by, The plurality of power module groups (3) on the same side of the X axis are symmetrically arranged relative to the Y axis coaxial with the rotation axis of the cathode roller (2), and when the output current of one power module group (3) decreases, the corresponding current output of the other power module group (3) symmetrically arranged relative to the Y axis on the same side of the X axis is controlled to increase.

3. The control method of claim 2, wherein The electric connection loop path lengths of the two power module groups (3) symmetrically arranged relative to the Y axis are the same.

4. The control method of guaranteeing thickness uniformity of a copper foil according to any one of claims 1 to 3, characterized by, Each of the four corners of the cathode roller (2) is provided with a power module group (3).

5. The control method of claim 4, wherein The power module group (3) is provided with a plurality of power modules (4) arranged side by side, the positive electrodes of the plurality of power modules (4) are connected through a positive electrode plate (5), and the negative electrodes are connected through a negative electrode plate (6).

6. The control method of claim 5, wherein The positive electrode plate (5) is provided with a plurality of positive electrode interfaces (7).

7. The control method of claim 6, wherein The number of the positive electrode interfaces (7) is greater than or equal to six.

8. The control method of claim 6 or 7, wherein The electrolyte pool (1) of the green foil machine is provided with an arc-shaped outer wall, a plurality of anode conductive rows (9) are uniformly and spacedly arranged on the arc-shaped outer wall, the plurality of anode conductive rows (9) are parallel to the rotation axis of the cathode roller (2), each positive electrode interface (7) is electrically connected with the middle position of the anode conductive row (9) through a conductive plate (10), and the positive electrode of the power module group (3) has a plurality of electric connection loops with equal path lengths between the positive electrode and the negative electrode of the power module group (3) through the anode conductive row (9).

9. The control method of claim 8, wherein The outer side of the anode conductive row (9) is connected with a conductive copper row, the conductive copper row is provided with an extension plate abutting against the anode conductive row (9) and an electric connection plate connected with the extension plate, and the electric connection plate is located at the middle position of the anode conductive row (9).

10. The control method of claim 9, wherein Each group of the conductive copper row is provided with two conductive members symmetrically arranged, wherein the first conductive member (11) is provided with a first electric connection plate (12) and a first extension plate (13), the second conductive member (14) is provided with a second electric connection plate (15) and a second extension plate (16), the first electric connection plate (12) and the second electric connection plate (15) are located at the middle position of the anode conductive row (9), and the first extension plate (13) and the second extension plate (16) extend towards opposite directions respectively.

Images