Device and working method for stress-controlled electroplating of composite current collector films

Abstract

The application provides a composite current collector film stress control electroplating device and working method. The device comprises an unwinding mechanism, an electroplating module, an oxidation prevention module and a winding mechanism. The electroplating module is used for forming a loop for electroplating. The flexible bearing belt is used for spreading the composite current collector to prevent wrinkles and can also prevent damage to the film due to the flexible insulating material. The organic solvent cleaning module is used for washing the residual liquid on the surface of the current collector after electroplating. The oxidation prevention module is used for preventing oxidation of the composite current collector with high surface activity after electroplating. The application solves the problems of the composite current collector, such as the copper layer formed on the surface of the equipment conductive roller easily piercing or scratching the film and wrinkles caused by the internal stress of the film, during water electroplating thickening, and improves the product yield.

Description

Technical Field

[0001] This invention belongs to the field of battery technology, and in particular relates to a composite current collector thin film stress-controlled electroplating preparation device and its working method. Background Technology

[0002] In the processing of composite current collectors, a pre-coating layer is typically formed on the original film using methods such as magnetron sputtering, vapor deposition, or chemical plating, followed by electroplating. Because the original film is very thin and flexible, it is prone to wrinkling in water due to liquid tension and internal stress, thus affecting the quality of the current collector product. Furthermore, in traditional electroplating processes, the current collector is subjected to metal conductive rollers on both sides, making it susceptible to damage from copper dendrites and other deposits formed on these rollers during conduction. Additionally, the surface of the electroplated composite current collector exhibits high nanoscale surface activity, making it prone to reacting with oxygen in the air, leading to oxidation. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a composite current collector thin film stress-controlled electroplating preparation device and working method.

[0004] To achieve the above-mentioned objectives, the technical solution of this invention is as follows:

[0005] A composite current collector thin film stress-controlled electroplating preparation apparatus, comprising, in sequence along the electroplating direction: an unwinding mechanism 1, an electroplating module, an anti-oxidation module, and a winding mechanism;

[0006] The unwinding mechanism 1 is used to unwind the composite PET film 2, which has a conductive seed layer formed on its surface after magnetron sputtering. It includes a drive motor and an unwinding roller driven by the drive motor, on which the composite PET film 2 is wound. It can be any unwinding mechanism, such as one including a drive motor and an unwinding roller.

[0007] Electroplating module: includes electroplating tank 7, with a conductive roller in the middle and a copper ball at the bottom. During electroplating, the conductive roller acts as the working electrode and the copper ball acts as the counter electrode, forming an electroplating circuit. The conductive roller is located above the surface of the composite PET film 2 to be electroplated.

[0008] Flexible support belt: Located inside the electroplating tank 7, it includes a conveyor roller and a belt driven by the conveyor roller. The width of the belt is greater than the width of the composite PET film 2, and the surface of the belt is made of flexible material. The conveyor roller and the conductive roller are positioned vertically opposite each other, with a gap between them for belt transmission. During electroplating, the electroplating solution on the non-electroplated side of the composite PET film 2 is squeezed out and pressed tightly against the non-electroplated side of the belt due to the pressure of the electroplating solution. After electroplating, the composite PET film 2 forms a composite current collector. The first flexible support conveyor belt and the second flexible support conveyor belt are arranged in the electroplating tank 7, and the first and second conveyor rollers are responsible for providing power to the belt.

[0009] Anti-oxidation module: used to prevent oxidation of electroplated composite current collectors, including an anti-oxidation solution device;

[0010] Winding mechanism: Used to wind up the film after it has been treated with anti-oxidation.

[0011] As a preferred embodiment, a guiding device is also included, which includes a guide roller disposed inside the unwinding mechanism 1, or inside the electroplating tank 7, or inside the anti-oxidation module, or between the unwinding mechanism 1 and the electroplating tank 7, or between the electroplating tank 7 and the anti-oxidation module, or between the anti-oxidation module and the winding mechanism.

[0012] A flexible support conveyor belt is used to support the composite PET film 2 during the electroplating process to prevent wrinkles. The flexible support conveyor belt is made of flexible material, which can prevent copper dendrites from damaging the current collector. After electroplating, the composite current collector is subjected to surface anti-oxidation treatment.

[0013] As a preferred embodiment, an organic solvent cleaning module is provided between the electroplating tank and the anti-oxidation module to wash away the residual liquid on the surface of the current collector after electroplating. The organic solvent cleaning module includes an organic solvent cleaning agent, a cleaning tank and an organic cleaning tension roller in the tank.

[0014] And / or an organic cleaning guide roller is provided between the electroplating tank and the organic solvent cleaning module.

[0015] As a preferred method, the organic solvent cleaning agent in the organic solvent cleaning module is anhydrous ethanol or trifluoroethylene.

[0016] As a preferred option, the flexible material on the surface of the belt is selected from natural rubber (NR), synthetic natural rubber (IR), styrene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR), ethylene propylene rubber (EPDM), and butyl rubber (IIR).

[0017] As a preferred embodiment, a hot drying module is provided between the anti-oxidation module and the winding mechanism. The hot drying module includes a hot drying mechanism 12. This removes small droplets remaining on the composite current collector after drying by the air-cooled drying mechanism.

[0018] As a preferred embodiment, a cold air drying module is provided between the anti-oxidation module and the winding mechanism. The cold air drying module includes a cold air drying mechanism. This removes large droplets present on the composite current collector that has undergone electroplating.

[0019] As a preferred embodiment, the electroplating bath 7 is provided with a first flexible carrier belt and a second flexible carrier belt, and the conductive rollers of the first flexible carrier belt and the second flexible carrier belt are respectively located on different surfaces of the composite PET film 2. Electroplating is performed on the upper and lower surfaces of the composite PET film 2 separately.

[0020] As a preferred embodiment, multiple flexible conveyor belts are spaced apart along the electroplating direction. This provides support during electroplating of the composite current collector.

[0021] The present invention also provides a method for operating the composite current collector thin film stress-controlled electroplating preparation device, which is as follows:

[0022] The unwinding mechanism 1 is used to unwind the composite PET film 2, which has a conductive seed layer formed on its surface after magnetron sputtering. The composite PET film 2 is wound onto the unwinding roller, and the drive motor drives the unwinding roller to rotate. The unwound composite PET film 2 is guided into the electroplating tank 7 by the guide roller. A flexible support conveyor belt is arranged in the electroplating tank 7. The conveyor roller provides power to the belt. The conductive roller acts as the working electrode during electroplating. During electroplating, the electroplating roller cooperates with the belt, and the electroplating solution on the non-electroplated side of the composite PET film 2 is squeezed out. Due to the pressure of the electroplating solution, it adheres tightly to the non-electroplated side of the belt. After electroplating in the electroplating tank 7, the composite PET film 2 enters the organic solvent cleaning module through the guide roller to clean the residual electroplating solution on the surface of the composite current collector. The organic solvent cleaning module is equipped with organic solvent cleaning agent 905, a cleaning tank, an organic cleaning guide roller, and an organic cleaning tension roller. The composite PET film 2 passes through... Organic cleaning guide rollers guide the organic solvent cleaning agent into the solution, where it is cleaned under the control of organic cleaning tension rollers. After cleaning, the solution is guided to the next step via the organic cleaning guide rollers. The anti-oxidation module is equipped with an anti-oxidation liquid 1005 and an anti-oxidation guide roller. The anti-oxidation module guides the electroplated and cleaned composite PET film 2 into the anti-oxidation liquid 1005 via the anti-oxidation guide rollers. In the anti-oxidation liquid, the composite PET film 2 undergoes anti-oxidation treatment supported by the anti-oxidation guide rollers, adding a protective film layer to the surface of the composite PET film 2. After the anti-oxidation treatment is completed, the composite PET film 2 is guided to the next step via the anti-oxidation guide rollers. The anti-oxidation device is connected to a cold air drying module and a hot drying module for drying the composite current collector. The dried composite PET film 2 is guided by guide rollers into the winding mechanism 14 connected at the rear. The winding mechanism 14 is used to rewind the composite current collector.

[0023] The beneficial effects of this invention are as follows: Compared with the traditional top-and-bottom arrangement of conductive rollers, this invention supports the composite PET film 2 during the electroplating process to prevent wrinkles. Furthermore, the flexible support conveyor belt is made of flexible material, which can prevent copper dendrites from damaging the current collector. This reduces the possibility of the copper plating layer forming on the conductive roller surface puncturing or scratching the film, and also reduces the impact of liquid buoyancy on the electroplating process. This invention solves the problems of copper plating layer easily forming on the conductive roller surface of the equipment to puncture or scratch the film, and wrinkles caused by the internal stress of the film itself, when the composite current collector is thickened by water electroplating, thus improving the product yield. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the composite current collector thin film stress-controlled electroplating preparation device of the present invention;

[0025] Figure 2 This is a top view showing the working principle of the flexible load-bearing belt of the present invention.

[0026] Wherein, 1 is the unwinding mechanism, 2 is the composite PET film, 3 is the first guide roller, 4 is the second guide roller, 7 is the electroplating tank, 8 is the third guide roller, 12 is the heat drying mechanism, 13 is the fourth guide roller, and 14 is the winding mechanism; 501 is the first conductive roller, 502 is the second conductive roller, 503 is the third conductive roller, 504 is the first belt, 505 is the first conveyor roller, 506 is the second conveyor roller, 601 is the fourth conductive roller, 602 is the fifth conductive roller, 603 is the sixth conductive roller, 604 is the second belt, 605 is the fifth conductive roller, 603 is the sixth conductive roller, 604 is the second belt, 605 is the sixth conductive roller, 605 is the seventh conductive roller, 605 is the eighth conductive roller, 606 is the ninth conductive roller, 607 is the eleventh conductive roller, 608 is the eleventh conductive roller, 609 is the eleventh conductive roller, 60 ... 606 is conveyor roller three, 606 is conveyor roller four; 901 is organic cleaning guide roller one, 902 is organic cleaning tension roller one, 903 is organic cleaning tension roller two, 904 is organic cleaning guide roller two, 905 is organic solvent cleaning agent, 1001 is anti-oxidation guide roller one, 1002 is anti-oxidation guide roller two, 1003 is anti-oxidation guide roller three, 1004 is anti-oxidation guide roller four, 1005 is anti-oxidation liquid; 1101 is upper cold air drying mechanism, 1102 is lower cold air drying mechanism. Detailed Implementation

[0027] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0028] A composite current collector thin film stress-controlled electroplating preparation apparatus, comprising, in sequence along the electroplating direction: an unwinding mechanism 1, an electroplating module, an anti-oxidation module, and a winding mechanism;

[0029] The unwinding mechanism 1 is used to unwind the composite PET film 2, which has a conductive seed layer formed on its surface after magnetron sputtering treatment. It includes a drive motor and an unwinding roller driven by the drive motor. The composite PET film 2 is wound on the unwinding roller.

[0030] Electroplating module: includes electroplating tank 7, with a conductive roller in the middle and a copper ball at the bottom. During electroplating, the conductive roller acts as the working electrode and the copper ball acts as the counter electrode, forming an electroplating circuit. The conductive roller is located above the surface of the composite PET film 2 to be electroplated.

[0031] Flexible support belt: Located inside the electroplating tank 7, it includes a conveyor roller and a belt driven by the conveyor roller. The width of the belt is greater than the width of the composite PET film 2, and the surface of the belt is made of flexible material. The conveyor roller and the conductive roller are positioned vertically opposite each other, with a gap between them for belt transmission. During electroplating, the electroplating solution on the non-electroplated side of the composite PET film 2 is squeezed out and pressed tightly against the non-electroplated side of the belt due to the pressure of the electroplating solution. After electroplating, the composite PET film 2 forms a composite current collector. The first flexible support conveyor belt and the second flexible support conveyor belt are arranged in the electroplating tank 7, and the first and second conveyor rollers are responsible for providing power to the belt.

[0032] Anti-oxidation module: used to prevent oxidation of electroplated composite current collectors, including an anti-oxidation solution device;

[0033] Winding mechanism: Used to wind up the film after it has been treated with anti-oxidation.

[0034] Preferably, in this embodiment, a guiding device is also included. The guiding device includes a guide roller, which is disposed inside the unwinding mechanism 1, or inside the electroplating tank 7, or inside the anti-oxidation module, or between the unwinding mechanism 1 and the electroplating tank 7, or between the electroplating tank 7 and the anti-oxidation module, or between the anti-oxidation module and the winding mechanism.

[0035] A flexible support conveyor belt is used to support the composite PET film 2 during the electroplating process to prevent wrinkles. The flexible support conveyor belt is made of flexible material, which can prevent copper dendrites from damaging the current collector. After electroplating, the composite current collector is subjected to surface anti-oxidation treatment.

[0036] Preferably, in this embodiment, an organic solvent cleaning module is provided between the electroplating tank and the anti-oxidation module to wash away the residual liquid on the surface of the current collector after electroplating. The organic solvent cleaning module includes an organic solvent cleaning agent, a cleaning tank, and an organic cleaning tension roller in the tank.

[0037] Preferably, in this embodiment, an organic cleaning guide roller is provided between the electroplating tank and the organic solvent cleaning module.

[0038] Preferably, in this embodiment, the organic solvent and organic cleaning agent 905 in the organic solvent cleaning module is anhydrous ethanol or trifluoroethylene.

[0039] Preferably, in this embodiment, the flexible material on the surface of the belt is selected from one of the following: natural rubber NR, synthetic natural rubber IR, styrene rubber SBR, butadiene rubber BR, chloroprene rubber CR, ethylene propylene rubber EPDM, and butyl rubber IIR.

[0040] Preferably, in this embodiment, a hot drying module is provided between the anti-oxidation module and the winding mechanism. The hot drying module includes a hot drying mechanism 12. This removes small droplets remaining on the composite current collector after drying by the air-cooled drying mechanism, preventing corrosion of the electroplated layer.

[0041] Preferably, in this embodiment, a cold air drying module is provided between the anti-oxidation module and the winding mechanism. The cold air drying module includes a cold air drying mechanism to remove large droplets present on the composite current collector that has undergone electroplating.

[0042] Preferably, in this embodiment, a first flexible carrier belt and a second flexible carrier belt are provided in the electroplating tank 7. The conductive rollers of the first flexible carrier belt and the second flexible carrier belt are respectively located on different surfaces of the composite PET film 2, and electroplating is performed on the upper and lower surfaces of the composite PET film 2 respectively.

[0043] Preferably, in this embodiment, multiple flexible conveyor belts are spaced apart along the electroplating direction. This provides support during electroplating of the composite current collector.

[0044] This embodiment also provides a method for operating the composite current collector thin film stress-controlled electroplating preparation device, which is as follows:

[0045] The unwinding mechanism 1 is used to unwind the composite PET film 2, which has a conductive seed layer formed on its surface after magnetron sputtering. The composite PET film 2 is wound on the unwinding roller, and the drive motor drives the unwinding roller to rotate, such as by direct drive or by drive motor through reducer, so as to actively unwind the pretreated composite PET film 2. The unwound composite PET film 2 is guided by the first guide roller 3 into the electroplating tank 7. A first flexible support conveyor belt and a second flexible support conveyor belt are arranged in the electroplating tank 7. The conveyor rollers provide power to the belts, and the conductive rollers act as working electrodes during electroplating. During electroplating, the electroplating rollers cooperate with the belts, and the electroplating solution on the non-electroplated side of the composite PET film 2 is squeezed out, adhering tightly to the non-electroplated side of the belt due to the pressure of the electroplating solution. After electroplating in the electroplating tank 7, the PET film 2 is guided by the organic cleaning guide roller 901 into the organic solvent cleaning agent 905. Cleaning is controlled by the organic cleaning tension rollers 902 and 903. After cleaning, it is guided by the organic cleaning guide roller 904 to the next step. The organic cleaning agent 905 can be anhydrous ethanol, trifluoroethylene, etc. The organic solvent cleaning module is used to clean the residual electroplating solution on the surface of the composite current collector, preventing it from corroding the surface metal coating. Furthermore, because the organic solvent is stable, there is no concern about it reacting with the downstream anti-oxidation solution. An anti-oxidation mechanism is connected after the organic solvent cleaning module. The anti-oxidation mechanism consists of an anti-oxidation liquid 1005 and anti-oxidation guide rollers 1-1001, 1-2, 3-3, and 4-4. The anti-oxidation mechanism guides the electroplated and cleaned composite PET film 2 into the anti-oxidation liquid 1005 through the anti-oxidation guide roller 1001. In the anti-oxidation liquid, the composite PET film 2 is supported by the anti-oxidation guide rollers 1-2 and 3-3 for anti-oxidation treatment, adding a protective film layer to the surface of the composite PET film 2. The protective film layer can effectively protect the metal layer of the composite current collector. After the composite PET film 2 completes the anti-oxidation treatment, it is guided by the anti-oxidation guide roller 1004 to enter the next step. The anti-oxidation device is connected to the cold air drying mechanism and the hot drying mechanism 12 to dry the composite current collector. After drying, the composite PET film 2 is guided by the fourth guide roller 13 to the winding mechanism 14 connected behind it. The winding mechanism 14 is used to roll the composite current collector back into a roll.

[0046] It should be noted that the above embodiments are merely used to illustrate the principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can adjust the above embodiments without departing from the principles of the present invention so that the present invention can be applied to more specific application scenarios. For example, at least one of the first guide roller 3, the second guide roller 4, the air-cooling mechanism, and the hot-drying mechanism can be omitted. For example, the number of conductive rollers in the first and second flexible support conveyor belts can be increased or decreased as needed. For example, the organic cleaning guide roller 901, the organic cleaning tension roller 902, the organic cleaning tension roller 903, and the organic cleaning guide roller 904 can be omitted. For example, the anti-oxidation guide roller 1001, the anti-oxidation guide roller 1002, the anti-oxidation guide roller 1003, and the anti-oxidation guide roller 1004 can be omitted.

[0047] Preferably, the lengths of the conductive roller, the conveyor roller, and the belt can be adjusted according to actual needs.

[0048] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A composite current collector thin film stress-controlled electroplating preparation apparatus, characterized in that, Along the electroplating direction, it includes, in sequence: unwinding mechanism (1), electroplating module, anti-oxidation module, and rewinding mechanism; The unwinding mechanism (1) is used to unwind the composite PET film (2) with a conductive seed layer formed on the surface after magnetron sputtering treatment, including a drive motor and an unwinding roller driven by the drive motor, wherein the composite PET film (2) is wound on the unwinding roller. Electroplating module: includes an electroplating tank (7), with a conductive roller in the middle and a copper ball at the bottom. During electroplating, the conductive roller acts as the working electrode and the copper ball acts as the counter electrode, forming an electroplating circuit. The conductive roller is located above the surface of the composite PET film (2) to be electroplated. Flexible carrier belt: Located in the electroplating tank (7), including conveyor rollers and conveyor roller driven belt body. The width of the belt body is greater than the width of the composite PET film (2). The surface of the belt body is made of flexible material. The conveyor rollers and conductive rollers are positioned vertically and vertically. The gap between the conveyor rollers and conductive rollers is for the transmission of the belt body. During electroplating, the electroplating liquid on the non-electroplated side of the composite PET film (2) is squeezed out and adheres tightly to the non-electroplated side of the belt body due to the pressure of the electroplating liquid. After electroplating, the composite PET film (2) forms a composite current collector. Anti-oxidation module: Used to prevent oxidation of electroplated composite current collectors, including anti-oxidation solution; Winding mechanism: Used to wind up the film after it has been treated with anti-oxidation.

2. The composite current collector thin film stress-controlled electroplating preparation apparatus according to claim 1, characterized in that: It also includes a guiding device, which includes a guide roller. The guide roller is disposed inside the unwinding mechanism (1), or inside the electroplating tank (7), or inside the anti-oxidation module, or between the unwinding mechanism (1) and the electroplating tank (7), or between the electroplating tank (7) and the anti-oxidation module, or between the anti-oxidation module and the winding mechanism.

3. The composite current collector thin film stress-controlled electroplating preparation apparatus according to claim 1, characterized in that: An organic solvent cleaning module is installed between the electroplating tank and the anti-oxidation module to wash away the residual liquid on the surface of the current collector after electroplating. The organic solvent cleaning module includes an organic solvent cleaning agent, a cleaning tank, and an organic cleaning tension roller in the tank. And / or an organic cleaning guide roller is provided between the electroplating tank and the organic solvent cleaning module.

4. The composite current collector thin film stress-controlled electroplating preparation apparatus according to claim 3, characterized in that: The organic solvent cleaning agent (905) in the organic solvent cleaning module is anhydrous ethanol or trifluoroethylene.

5. The composite current collector thin film stress-controlled electroplating preparation apparatus according to claim 1, characterized in that: The flexible material on the surface of the belt is selected from natural rubber (NR), synthetic natural rubber (IR), styrene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR), ethylene propylene rubber (EPDM), and butyl rubber (IIR).

6. The composite current collector thin film stress-controlled electroplating preparation apparatus according to claim 1, characterized in that: A hot drying module is provided between the anti-oxidation module and the winding mechanism, and the hot drying module includes a hot drying mechanism (12).

7. The composite current collector thin film stress-controlled electroplating preparation apparatus according to claim 1, characterized in that: A cold air drying module is provided between the anti-oxidation module and the winding mechanism, and the cold air drying module includes a cold air drying mechanism.

8. The composite current collector thin film stress-controlled electroplating preparation apparatus according to claim 1, characterized in that: The electroplating tank (7) is provided with a first flexible carrier belt and a second flexible carrier belt, and the conductive rollers of the first flexible carrier belt and the second flexible carrier belt are located on different surfaces of the composite PET film (2).

9. The composite current collector thin film stress-controlled electroplating preparation apparatus according to claim 1, characterized in that: Multiple flexible support strips are spaced apart along the electroplating direction.

10. The operating method of the composite current collector thin film stress-controlled electroplating preparation apparatus according to any one of claims 2 to 9, characterized in that: The unwinding mechanism (1) is used to unwind the composite PET film (2) with a conductive seed layer formed on its surface after magnetron sputtering. The composite PET film (2) is wound on the unwinding roller. The drive motor drives the unwinding roller to rotate. The unwound composite PET film (2) is guided into the electroplating tank (7) by the guide roller. The flexible carrier belt is arranged in the electroplating tank (7). The conveyor roller provides power to the belt. The conductive roller acts as the working electrode during electroplating. During electroplating, the conductive roller cooperates with the belt. The electroplating liquid on the non-electroplated side of the composite PET film (2) is squeezed out and adheres tightly to the non-electroplated side of the belt due to the pressure of the electroplating liquid. After electroplating in the electroplating tank (7), the composite PET film (2) enters the organic solvent cleaning module between the electroplating tank and the anti-oxidation module through the guide roller. The residual electroplating liquid on the surface of the composite current collector is cleaned. The organic solvent cleaning module is equipped with organic solvent cleaning agent (905), cleaning tank and organic cleaning guide roller, and organic cleaning tension roller. The composite PET film (2) is guided by the organic cleaning guide roller. The organic solvent cleaning agent is introduced into the cleaning agent, and the cleaning is controlled by the organic cleaning tension roller. After cleaning, it is guided to the next step by the organic cleaning guide roller. The anti-oxidation module is equipped with anti-oxidation liquid (1005) and anti-oxidation guide roller. The anti-oxidation module guides the composite PET film (2) after electroplating and cleaning into the anti-oxidation liquid (1005) by the anti-oxidation guide roller. In the anti-oxidation liquid, the composite PET film (2) is supported by the anti-oxidation guide roller for anti-oxidation treatment, and a protective film layer is added to the surface of the composite PET film (2). After the anti-oxidation treatment is completed, the composite PET film (2) is guided to the next step by the anti-oxidation guide roller. The cold air drying module connected between the anti-oxidation module and the winding mechanism and the hot drying module connected between the anti-oxidation module and the winding mechanism are used to dry the composite current collector. After drying, the composite PET film (2) is guided into the winding mechanism (14) connected behind by the guide roller. The winding mechanism (14) is used to roll the composite current collector back into a roll.

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