Anti-coppering sectional conductive roller for photovoltaic cell electroplating

Abstract

The invention discloses an anti-coppering sectional type conductive roller for photovoltaic cell electroplating, and relates to the technical field of photovoltaic cell electroplating, the conductive roller comprises an insulation roller, a hollow rotating shaft is coaxially fixed in the insulation roller, and a plurality of electric brush groups are arranged in the insulation roller along the circumferential direction in an annular array manner; each electric brush set is composed of a plurality of conductive needles arranged in the axial direction of the insulating roller, and the conductive needles are arranged in the radial direction of the insulating roller. One end of the conductive needle extends to an inner hole of the hollow rotating shaft, and the other end telescopically extends out of the outer surface of the insulating roller; conductive plates corresponding to the electric brush sets are arranged in an inner hole of the hollow rotating shaft, and the conductive plates are electrically connected with the conductive needles of the corresponding electric brush sets. According to the anti-coppering sectional type conductive roller for photovoltaic cell electroplating, through precise cooperation of physical isolation, self-cleaning and intermittent power supply of the telescopic conductive needles, the coppering phenomenon is eradicated fundamentally, and the long-term operation reliability and stability of equipment are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic cell electroplating technology, and in particular to a segmented conductive roller for preventing copper from adhering to photovoltaic cells during electroplating. Background Technology

[0002] In the continuous electroplating process of photovoltaic cells, the conductive roller is the core transmission and conduction component. The cells are continuously conveyed through the plating tank, and the roller rotates to contact the cells, providing a stable cathode current at the contact point, thereby achieving efficient metal deposition. This rotary contact electroplating method lays the technological foundation for achieving high-speed, continuous industrial production.

[0003] However, this overall conductive rotating design in existing technology also introduces an inherent drawback: the part of the conductive roller immersed in the electroplating solution, although not in contact with the solar cell, is energized due to overall conductivity, creating a parasitic potential in the solution. This leads to the unintended deposition of copper ions on the surface, a phenomenon known as "copper deposition." This not only causes unnecessary loss of precious metals but also results in a continuous increase in roller diameter and surface roughening, which in turn interferes with the stable transport of the solar cell and the uniformity of the plating layer. Ultimately, this forces frequent production line shutdowns for maintenance, severely restricting production efficiency and cost control.

[0004] Therefore, there are still shortcomings and deficiencies in the existing technology, and how to provide a copper-resistant conductive roller is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a segmented conductive roller for preventing copper plating in photovoltaic cells. This invention solves the technical problem that in the existing continuous electroplating process of photovoltaic cells, due to the overall conductivity of the conductive roller, the non-contact area immersed in the chemical solution will undergo unexpected electroplating (copper plating) under the action of parasitic potential, resulting in material loss, equipment wear and production interruption.

[0006] To achieve the above objectives, the present invention provides a segmented conductive roller for preventing copper plating in photovoltaic cells, comprising an insulating roller, a hollow rotating shaft coaxially fixed inside the insulating roller, and several sets of brush groups arranged in a ring array along its circumference inside the insulating roller, each set of brush groups consisting of multiple conductive needles arranged along the axial direction of the insulating roller, and each conductive needle arranged along the radial direction of the insulating roller. One end of the conductive needle extends into the inner hole of the hollow rotating shaft, and the other end can extend and protrude out of the outer surface of the insulating roller; the inner hole of the hollow rotating shaft is provided with conductive plates corresponding to each group of brushes, and each conductive plate is electrically connected to the conductive needle of the corresponding brush group. One end of the hollow rotating shaft is detachably connected to a conductive shaft. Several sector-shaped electrodes are embedded radially inside the conductive shaft. Each sector-shaped electrode is connected to the conductive plate of the corresponding brush group through an independent wire. The conductive roller also includes an intermittent control mechanism for driving the radial extension and retraction of the conductive needle.

[0007] Preferably, the outer circumferential surface of the fan-shaped electrode inside the conductive shaft is coplanar with the outer circumferential surface of the conductive shaft and transitions smoothly, and the number and angle arrangement of the fan-shaped electrodes correspond to the brush group on the insulating roller.

[0008] Preferably, an insulating sleeve is fixedly provided radially inside the insulating roller. The insulating sleeve forms a guide channel for the sliding insertion of the conductive needle. The two ends of the insulating sleeve extend to the inner cavity wall and the outer circumferential surface of the insulating roller, respectively.

[0009] Preferably, the end of the conductive needle located in the inner hole of the hollow rotating shaft is configured as a tapered end, with the end of the tapered end with a smaller taper facing outwards from the insulating roller, and the end with a larger taper facing towards the center of the hollow rotating shaft.

[0010] Preferably, an elastic connector is provided in the inner hole of the hollow rotating shaft. The elastic connector includes a spring fitted on the limiting rod. The spring acts on the conductive plate and provides an elastic force that moves the conductive plate toward the center of the hollow rotating shaft.

[0011] Preferably, a limiting rod is disposed through the conductive plate, one end of the limiting rod is rigidly connected to the wall of the inner hole of the hollow rotating shaft, and the other end is provided with a nut to restrict the conductive plate to a range that allows it to move axially along the limiting rod.

[0012] Preferably, the intermittent control mechanism includes a fixed shaft, a rotating frame, a cam, and a guide column. The fixed shaft is located at the center of the inner hole of the hollow rotating shaft and is coaxially positioned with the inner hole of the hollow rotating shaft through the rotating frame. The cam is fixedly mounted on the fixed shaft, and the guide column is fixedly mounted on each conductive plate and contacts the outer circumferential surface of the cam.

[0013] Preferably, the rotating frame includes a sleeve and a plurality of fixed rods that are radially and evenly distributed between the outer wall of the sleeve and the inner wall of the hollow rotating shaft, and the fixed shaft is rotatably supported inside the sleeve.

[0014] Preferably, the outer circumferential surface of the cam is provided with a radially raised protrusion, the protrusion including a section of arc surface concentric with the base circle of the cam.

[0015] Preferably, the end of the guide post is machined into an arc surface, and the arc surface is in contact with the outer circumferential surface of the cam.

[0016] The present invention has the following advantages: (1) Compared with the above-mentioned background technology, the present invention provides a segmented conductive roller for photovoltaic cell electroplating that prevents copper from being deposited. Through a rotational switching mode with intermittent contact between a built-in fan-shaped electrode and an external fixed brush, it achieves precise partitioned power supply, which conducts power only in the working area and cuts off power in the non-working area. This fundamentally eliminates the parasitic potential in the electroplating solution in the non-contact area and completely blocks the unintended reduction and deposition of copper ions on the roller surface, thereby completely eliminating the phenomenon of "copper deposits". At the same time, this purely mechanical synchronous switching mechanism is reliable in operation and does not require complex electrical control. It greatly reduces the need for frequent shutdowns for cleaning and component replacement caused by "copper deposits", effectively improves production continuity and overall economic benefits, and provides key technical support for high-quality and high-efficiency continuous electroplating production of photovoltaic cells.

[0017] (2) Compared with the above-mentioned background technology, the present invention provides a retractable design for the conductive needle of the anti-copper segmented conductive roller for photovoltaic cell electroplating. Through physical isolation, the anti-copper effect is further enhanced. In the working state, it only extends at a specific position in contact with the cell, which greatly reduces the exposure area and time of the conductive needle in the electroplating solution, and fundamentally limits the physical conditions for electrochemical deposition. At the same time, the scraping action between the conductive needle and the inner wall of the insulating sleeve during the retraction process can automatically remove the trace deposits or impurities on its surface, realizing a simple self-maintenance function, which helps to keep the surface of the conductive needle clean and the contact resistance stable for a long time. Thus, based on intermittent conductivity, it provides double protection from the physical contact level, which significantly improves the long-term operational stability and reliability of the equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 A magnified schematic diagram of the structure at point A; Figure 3 This is a schematic cross-sectional view of the rotating shaft structure of the present invention; Figure 4 This is a schematic diagram of a portion of the internal structure of the rotating shaft of the present invention; Figure 5 This is a schematic diagram of the conductive shaft structure of the present invention; Figure 6 For the present invention Figure 4 A magnified schematic diagram of the structure at point C; Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at point D; Figure 8 For the present invention Figure 6 A magnified schematic diagram of the structure at point E; Figure 9 For the present invention Figure 3 A magnified schematic diagram of the structure at point B; Figure 10 This is a schematic diagram of the cam structure of the present invention.

[0020] In the diagram: 1. Insulating roller; 2. Brush assembly; 3. Rotating shaft; 4. Inner hole; 5. Conductive plate; 6. Conductive shaft; 7. Fan-shaped electrode; 8. Intermittent control mechanism; 9. Elastic connector; 10. Arc segment; 11. Insulating sleeve; 201. Conductive needle; 2011. Conical end; 801. Fixed shaft; 802. Rotating frame; 803. Cam; 804. Protrusion; 805. Guide post; 901. Limiting rod; 902. Nut; 903. Spring; 821. Sleeve; 822. Fixed rod. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] This invention provides a segmented conductive roller for electroplating photovoltaic cells to prevent copper deposition. Its retractable conductive needle design eliminates the "copper deposition" phenomenon at its source through physical isolation, self-cleaning, and precise coordination with intermittent power supply. It also significantly improves the long-term operational reliability and stability of the equipment. Furthermore, it solves the problem in existing technologies where the non-contact portion of the rotating conductive roller immersed in the electroplating solution, which is continuously charged, causes unexpected copper ion deposition, leading to metal loss, deterioration of roller size and surface condition, and ultimately disrupting production continuity and coating uniformity, severely restricting production efficiency and cost.

[0024] Please refer to this as well. Figures 1 to 10This invention provides a segmented conductive roller for anti-copper plating of photovoltaic cells. Its main body is an insulating roller 1, inside which several sets of brush groups 2 are arranged in a circular array along its circumference. Each brush group 2 consists of multiple conductive needles 201 arranged axially along the insulating roller 1. Each conductive needle 201 is inserted radially into the insulating roller 1, with one end extending to the central region inside the insulating roller 1 and the other end protruding from the outer surface of the insulating roller 1. During the electroplating operation, the insulating roller 1 is rotatably mounted in the electroplating tank. Through its continuous rotation, the ends of the conductive needles 201 protruding from its surface can periodically contact the passing solar cells, thereby forming a conductive path to complete the electroplating.

[0025] However, under normal operating conditions, only a portion of the brush assembly 2 on the insulating roller 1 comes into contact with the solar cells. The majority of the brush assembly 2, immersed in the electroplating solution, remains electrically charged despite not contacting the workpiece. This creates a parasitic potential in the solution, causing copper ions to undergo unexpected reduction deposition on the surface of the conductive needles 201 in these non-working areas, resulting in a phenomenon known as "copper deposition." This phenomenon not only directly causes ineffective copper metal loss but also, due to the continuous accumulation of deposits, gradually increases the diameter of the conductive roller and roughens its surface. Ultimately, this disrupts the stability of solar cell transmission and the uniformity of the electroplating layer, forcing frequent production line shutdowns for cleaning or maintenance, severely restricting production efficiency and cost control.

[0026] To solve the aforementioned "copper application" problem, this embodiment makes a key innovation to the power supply structure of the conductive roller, giving it intermittent conductive function.

[0027] Specifically, please refer to the following: Figures 1 to 5 A hollow rotating shaft 3 is coaxially fixed inside the insulating roller 1, enabling the installation and rotation of the insulating roller 1 in the electroplating tank. An axially oriented inner hole 4 is formed inside the rotating shaft 3. The ends of each brush group 2 extending to the center of the insulating roller 1 are connected to this inner hole 4 and electrically connected to a conductive plate 5 independently installed within the inner hole 4. Furthermore, a conductive shaft 6 is detachably connected to one end of the rotating shaft 3 via threads. The core of this conductive shaft 6 lies in the radially embedded portion of several fan-shaped electrodes 7. The outer circumferential surfaces of these electrodes are coplanar with and smoothly transition to the outer circumferential surface of the conductive shaft 6, and their number and angular arrangement completely correspond to the brush groups 2 on the insulating roller 1. Each fan-shaped electrode 7 is connected to the corresponding brush group 2 within the inner hole 4 via an independent wire.

[0028] During operation, the power supply brushes fixed to the outside of the electroplating tank contact the outer circle of the rotating conductive shaft 6. Since the sector-shaped electrodes 7 on the outer circle of the conductive shaft 6 are only conductive at specific angular positions, the corresponding brush group 2 only receives current when a sector-shaped electrode 7 rotates to contact the externally fixed brush. This design ensures that at any given time, only the brush group 2 directly below the battery cell is energized, while the remaining brush groups 2 immersed in the chemical solution are completely de-energized, thus fundamentally blocking the electrochemical conditions for copper plating.

[0029] To fundamentally eliminate the "copper buildup" phenomenon and further improve equipment reliability, this embodiment incorporates a retractable structure design for brush assembly 2 based on intermittent conductivity. Please refer to the following: Figures 1 to 4 , Figures 6-7 The core of this system lies in the fact that the conductive needles 201 in each brush assembly 2 are configured to extend and retract radially along the insulating roller 1, driven by an intermittent control mechanism 8. This ensures that the conductive needles 201 only extend from the roller surface to make contact with the conductive material when rotating to the working position of the battery cell, and automatically retract into the insulating roller 1 when rotating to other non-working positions. This significantly reduces the contact area and time between the conductive needles 201 and the electroplating solution, thereby further reducing the probability of electroplating deposition from a physical contact perspective, thus strengthening and supplementing the intermittent conductivity principle.

[0030] To ensure reliable extension and sealing of the conductive needle 201, a dedicated insulating sleeve 11 is radially fixed inside the insulating roller 1 in this embodiment. The two ends of the insulating sleeve 11 extend to the inner wall and outer circumferential surface of the insulating roller 1, respectively, and smoothly transition with the roller body, forming a precision guide channel for the axial movement of the conductive needle 201. The conductive needle 201 is slidably inserted into the insulating sleeve 11. One end of the conductive needle 201 located in the inner hole 4 of the rotating shaft 3 is designed as a tapered end 2011 with a specific taper, where the end with a smaller taper faces outwards from the roller body, and the end with a larger taper faces towards the center of the rotating shaft 3. When the conductive needle 201 extends outwards under the action of the control mechanism, its tapered end 2011 forms a tight line or surface contact with the corresponding mating hole wall in the inner hole 4 of the rotating shaft 3, thereby achieving effective sealing under dynamic conditions and preventing electroplating liquid from seeping into critical components inside the roller body along the gap between the conductive needle 201 and the guide sleeve.

[0031] Please refer to this as well. Figure 4 , Figures 6-7The elastic reset mechanism that drives the extension and retraction of the conductive needle 201 is specifically disposed within the inner hole 4 of the rotating shaft 3. The conductive plate 5, which is electrically connected to the conductive needle 201, is not fixedly installed, but is movably connected to the inner wall of the inner hole 4 of the rotating shaft 3 via an elastic connector 9. Specifically, multiple limiting rods 901 are provided through both ends and the middle of the conductive plate 5. One end of these limiting rods 901 is rigidly connected to the hole wall of the inner hole 4 of the rotating shaft 3 via a thread, and the other end is equipped with a nut 902 to prevent it from falling out, thereby restricting the conductive plate 5 to the range that allows it to move axially along the limiting rods 901. Between the conductive plate 5 and the hole wall of the inner hole 4 of the rotating shaft 3, a spring 903 fitted on the limiting rod 901 continuously provides an elastic force that moves the conductive plate 5 toward the center of the rotating shaft 3. Under the action of this elastic force, the conductive needle 201 connected to the conductive plate 5 is passively retracted and is in a normal contracted state. Only when the roller rotates, causing the conductive needles 201 to reach a specific working position, will the external intermittent control component (such as the cam 803) apply a larger force to overcome the elasticity of the spring 903, pushing the conductive plate 5 and the conductive needles 201 outward to achieve contact with the battery cell. This ensures precise synchronization between the extension / retraction action and the rotation position.

[0032] In this embodiment, the control mechanism that realizes the intermittent extension and retraction motion of the conductive needle 201 is based on a precision cam 803 drive system. Please refer to the following: Figures 6-10 The system mainly includes a fixed shaft 801, a rotating frame 802, a cam 803, and a guide column 805. The fixed shaft 801 is located at the center of the inner hole 4 of the rotating shaft 3 and is coaxially positioned with the inner hole 4 of the rotating shaft 3 through a rotating frame 802. The rotating frame 802 consists of a sleeve 821 and multiple fixing rods 822 that are radially and evenly distributed between the outer wall of the sleeve 821 and the wall of the inner hole 4 of the rotating shaft 3. The fixed shaft 801 is rotatably supported within the sleeve 821.

[0033] A cam 803 is fixedly mounted on the central section of the conductive plates 5 of the multiple sets of brush groups 2 on the fixed shaft 801. The outer circumferential surface of the cam 803 has a radially raised protrusion 804, which smoothly transitions to the base circle of the cam 803. Its orientation is preset to always face the working position where the conductive needle 201 needs to extend. A guide post 805 is fixedly mounted on the center-facing surface of each conductive plate 5. The end of the guide post 805 is machined into an arc surface so that it can always maintain contact with the outer circumferential surface of the cam 803. During equipment installation, the rotating shaft 3 is rotatably connected to the electroplating tank housing, while the fixed shaft 801 is fixed and locked by external connectors. This ensures that when the rotating shaft 3 drives the entire roller body and the internal conductive plates 5 to rotate, the fixed shaft 801 and its cam 803 remain absolutely stationary under the support of the rotating frame 802, so that the protrusion 804 of the cam 803 always points to the working position.

[0034] Based on the above structure, its working process is as follows: When the rotating shaft 3 rotates, each group of conductive plates 5 and its guide post 805 revolve accordingly. When a group of conductive plates 5 rotates to a position close to the working position, its guide post 805 will first contact and climb along the inclined surface of the protrusion 804 of the cam 803. The cam 803 applies radial force to the conductive plate 5 through the guide post 805, overcoming the resistance of the spring 903, and pushing the conductive plate 5 to slide along the limit rod 901 to the outside of the roller body, thereby driving all the conductive needles 201 in that group to extend out of the insulating sleeve 11 simultaneously. This contact and driving process is designed to occur before the conductive needles 201 reach the precise working position to ensure that the conductive needles 201 are fully extended and in a stable contact state when they reach the bottom of the battery cell. After the conductive needles 201 have rotated past the working position with the roller body, the guide post 805 disengages from the protrusion 804 of the cam 803, and the conductive plate 5 immediately retracts towards the center under the action of the return spring 903, driving the conductive needles 201 to retract into the insulating sleeve 11. During the retraction process, the outer wall of the conductive needle 201 will scrape against the edge of the inner hole 4 at the outlet end of the insulating sleeve 11. This action can automatically remove trace amounts of electroplating residue or impurities adhering to the surface of the conductive needle 201, achieving a simple self-cleaning function.

[0035] To achieve stable contact of the conductive needle 201 in the working position, such as Figure 10 As shown, the outermost edge of the protrusion 804 of the cam 803 is an arc surface concentric with the base circle of the cam 803. The central angle range of this arc surface completely covers the fully extended stroke range of the conductive needle 201. When the guide post 805 runs on this concentric arc surface, the radial thrust of the cam 803 on the guide post 805 (i.e., the conductive plate 5) remains constant, thereby ensuring that the extension length of the conductive needle 201 is absolutely stable during the working position, avoiding poor contact or pressure changes caused by length fluctuations, and providing continuous and stable current conduction for the battery cell.

[0036] In this embodiment, during operation: as the roller body rotates continuously, the conductive roller is installed in the electroplating tank through the hollow rotating shaft 3 and rotates at a uniform speed. The power supply brush fixed outside the tank body always maintains contact with the outer circle of the conductive shaft 6 at the end of the rotating shaft 3. The fan-shaped electrodes 7 in the annular array inside the conductive shaft 6 rotate with the roller body. Only when a certain fan-shaped electrode 7 rotates to a specific angle that contacts the external fixed brush, the current is conducted through the fan-shaped electrode 7 and the internal wire to the conductive plate 5 behind the corresponding set of conductive needles 201, thereby realizing zoned selective power supply. Meanwhile, inside the roller, a stationary fixed shaft 801, fixed by an external structure, passes through the center of the rotating shaft 3. The cam 803 protrusion 804 on the shaft constantly points to the working position below the cell transmission path. When a group of conductive needles 201 approaches the working position during rotation, the guide post 805 on its conductive plate 5 begins to contact the inclined surface of the protrusion 804 of the stationary cam 803 and climbs along it, pushing the entire conductive plate 5 to overcome the force of the spring 903 and slide outward along the limiting rod 901. This causes all the conductive needles 201 in the group to extend radially synchronously along the guide of the insulating sleeve 11, so that their needle tips protrude from the roller surface. Immediately afterwards, the guide post 805 enters the concentric arc segment 10 at the top of the protrusion 804 of the cam 803. At this time, the conductive needles 201 are fully extended and their length remains constant within the arc segment 10. Almost synchronously, the group of conductive needles 201 obtains current because the corresponding fan-shaped electrode 7 rotates into position, thereby achieving stable and continuous conductive contact with the cell that is passing by to complete the electroplating. When the set of conductive needles 201 rotates past the working position with the roller, its corresponding sector electrode 7 disengages from the external fixed brush, and the power supply is immediately cut off. At the same time, the guide post 805 also leaves the protrusion 804 of the cam 803, and the conductive plate 5 quickly retracts towards the center under the action of the return spring 903, pulling the conductive needles 201 back into the insulating sleeve 11. During the retraction process, the outer wall of the conductive needles 201 scrapes against the port of the insulating sleeve 11 to clean the surface. Thereafter, until the next rotation to the working position, the set of conductive needles 201 is always in a retracted and de-energized state, minimizing contact with the electroplating solution. This cycle repeats, realizing the entire process of conductivity, electroplating, anti-copper coating, and self-maintenance.

[0037] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0038] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A segmented conductive roller for preventing copper plating in photovoltaic cells, comprising an insulating roller (1), characterized in that, The insulating roller (1) has a hollow rotating shaft (3) fixed coaxially inside. The insulating roller (1) has several sets of brush groups (2) arranged in a ring array along its circumference. Each set of brush groups (2) consists of multiple conductive needles (201) arranged along the axial direction of the insulating roller (1). Each conductive needle (201) is arranged along the radial direction of the insulating roller (1). One end of the conductive needle (201) extends into the inner hole (4) of the hollow rotating shaft (3), and the other end extends out of the outer surface of the insulating roller (1); a conductive plate (5) corresponding to each group of brushes (2) is provided in the inner hole (4) of the hollow rotating shaft (3), and each conductive plate (5) is electrically connected to the conductive needle (201) of the corresponding brush group (2). One end of the hollow rotating shaft (3) is detachably connected to a conductive shaft (6). Several fan-shaped electrodes (7) are embedded radially inside the conductive shaft (6). Each fan-shaped electrode (7) is connected to the conductive plate (5) of the corresponding brush group (2) through an independent wire. The conductive roller also includes an intermittent control mechanism (8) for driving the radial extension and retraction of the conductive needle (201).

2. The segmented conductive roller for preventing copper plating in photovoltaic cells according to claim 1, characterized in that, The outer circumferential surface of the fan-shaped electrode (7) inside the conductive shaft (6) is coplanar with the outer circumferential surface of the conductive shaft (6) and smoothly transitions. The number and angle arrangement of the fan-shaped electrode (7) correspond to the brush group (2) on the insulating roller (1).

3. The segmented conductive roller for preventing copper plating in photovoltaic cells according to claim 1, characterized in that, An insulating sleeve (11) is fixedly arranged radially inside the insulating roller (1). The insulating sleeve (11) forms a guide channel for the conductive needle (201) to slide into. The two ends of the insulating sleeve (11) extend to the inner wall of the insulating roller (1) and the outer circumferential surface, respectively.

4. A segmented conductive roller for preventing copper plating in photovoltaic cells according to claim 3, characterized in that, The conductive needle (201) is located in the inner hole (4) of the hollow rotating shaft (3) with one end set as a tapered end (2011). The tapered end (2011) with a smaller taper faces outward from the insulating roller (1), and the tapered end with a larger taper faces towards the center of the hollow rotating shaft (3).

5. A segmented conductive roller for preventing copper plating in photovoltaic cells according to claim 1, characterized in that, An elastic connector (9) is provided in the inner hole (4) of the hollow rotating shaft (3). The elastic connector (9) includes a spring (903) fitted on the limiting rod (901). The spring (903) acts on the conductive plate (5) to provide an elastic force that moves the conductive plate (5) toward the center of the hollow rotating shaft (3).

6. A segmented conductive roller for preventing copper plating in photovoltaic cells according to claim 5, characterized in that, The limiting rod (901) is disposed through the conductive plate (5). One end of the limiting rod (901) is rigidly connected to the wall of the inner hole (4) of the hollow rotating shaft (3), and the other end is provided with a nut (902) to restrict the conductive plate (5) within the range that allows it to move axially along the limiting rod (901).

7. A segmented conductive roller for preventing copper plating in photovoltaic cells according to claim 1, characterized in that, The intermittent control mechanism (8) includes a fixed shaft (801), a rotating frame (802), a cam (803), and a guide column (805). The fixed shaft (801) is located at the center of the inner hole (4) of the hollow rotating shaft (3) and is coaxially positioned with the inner hole (4) of the hollow rotating shaft (3) through the rotating frame (802). The cam (803) is fixedly mounted on the fixed shaft (801). The guide column is fixedly mounted on each conductive plate (5) and contacts the outer circumferential surface of the cam (803).

8. A segmented conductive roller for preventing copper plating in photovoltaic cells according to claim 7, characterized in that, The rotating frame (802) includes a sleeve (821) and a plurality of fixed rods (822) that are radially and evenly connected between the outer wall of the sleeve (821) and the inner hole (4) wall of the hollow rotating shaft (3). The fixed shaft (801) is rotatably supported inside the sleeve (821).

9. A segmented conductive roller for preventing copper plating in photovoltaic cells according to claim 7, characterized in that, The outer circumferential surface of the cam (803) is provided with a radially raised protrusion (804), the protrusion (804) including a section of arc surface with the same center as the base circle of the cam (803).

10. A segmented conductive roller for preventing copper plating in photovoltaic cells according to claim 7, characterized in that, The end of the guide post (805) is machined into an arc surface, and the arc surface is in contact with the outer circumferential surface of the cam (803).

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