Roller assembly and electroplating system

Abstract

The utility model relates to a roller assembly and an electroplating system. The flexible conductive tube is arranged outside the axis in a sleeving mode, and the flexible conductive tube is flexible, makes contact with the surface of the workpiece to be electroplated and is used for transmitting current to the surface of the workpiece to be electroplated. The electroplating device is compact and reasonable in structure and convenient to operate, through various combinations of the axis, the flexible conductive tube and the filling medium, electroplating can be achieved while solar cells are flexibly conveyed, meanwhile, the contact area of the roller assemblies and the solar cells is increased, the conductive efficiency is improved, the electroplating effect is improved, and the service life of the electroplating device is prolonged. In addition, the electroplating device can be better attached to the uneven surface and grid lines of the solar cell, and therefore electroplating with the uniform thickness is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electroplating, especially to the cathode contact technology in the electroplating solar cell technology. BACKGROUND

[0002] Silver paste is often used for electrodes of solar cells due to its excellent electrical conductivity and compatibility with battery materials. However, as the demand for silver paste by solar cells continues to grow, the cost of silver paste continues to increase, posing a challenge to reducing the production cost of solar cells. Therefore, replacing silver paste with copper electrodes is becoming increasingly popular. Compared with silver, copper is more abundant and more economical, making it a viable alternative for large-scale solar cell production.

[0003] One of the viable technologies for applying copper to solar cells to form electrodes is to adopt electroplating technology. Further, among various electroplating technologies, horizontal electroplating has shown advantages over vertical electroplating. Compared with vertical electroplating, horizontal electroplating technology has the advantages of large production capacity, low scrap rate, easy production management, and small equipment footprint.

[0004] Of course, to achieve the above advantages of horizontal electroplating, it is necessary to ensure uniform contact between the cathode and the surface of the battery in the electroplating process, or in other words, a key challenge of horizontal electroplating is how the cathode in the electroplating process establishes reliable electrical contact with the solar cell.

[0005] Chinese patent CN 114990659 A discloses a horizontal electroplating device for crystalline silicon photovoltaic cells, an electroplating system and a use. In this patent, the cathode uses a conductive brush structure to contact and conduct electricity with the battery piece. However, in actual work, the conductive brush can damage the surface of the battery piece, affecting product quality. In addition, since the conductive brush will also be electroplated after contacting the electroplating solution, it needs to be cleaned frequently. Moreover, since the width of the electroplated area of the solar cell, i.e. the grid line electroplating groove, is only a few tens of microns, it is difficult for the traditional brush with a large diameter to directly contact the grid line electroplating groove, affecting the electroplating effect of the grid line.

[0006] Chinese patent CN 214848658 U proposes a method for contacting the cathode with the surface of the battery in the electroplating process. This method uses a cathode roller to contact the surface of the solar cell. Since the solar cell is very fragile, one of the disadvantages of this method is that the cathode roller can easily cause the solar cell piece to break. Another disadvantage of this method is that the maximum contact area of the cathode roller with the solar cell piece is a line. The maximum area refers to the fact that the thickness of the two sides of the solar cell piece is not equal. That is, one side is thick and the other side is thin, so the cathode roller cannot guarantee to contact the entire surface of the solar cell piece.

[0007] The utility model aims to solve the above-mentioned defects. The utility model discloses the content

[0008] The applicant provides a roller assembly and a use method in the light of the defects in the prior production technology, which can improve the contact area of the roller assembly and the solar cell piece, reduce the contact resistance between the roller assembly and the solar cell piece surface and improve the plating effect by the combination of the shaft, the flexible conductive tube and the transmission block of the roller assembly.

[0009] The utility model discloses the technical scheme as follows:

[0010] A roller assembly, which comprises the following structure:

[0011] A shaft;

[0012] A flexible conductive tube is sleeved on the outer side of the shaft, and the outer surface of the flexible conductive tube is flexible and contacts the surface of the workpiece to be plated, so as to transmit current to the surface of the workpiece to be plated.

[0013] In one embodiment, the flexible conductive tube is a single-layer flexible conductive tube and has a certain flexibility, including a single-layer conductive rubber tube or a single-layer conductive plastic.

[0014] In one embodiment, the flexible conductive tube is a multi-layer flexible conductive tube composed of multiple materials, which can be composed of a flexible non-conductive tube and a flexible conductive medium. The flexible non-conductive tube can be a plastic tube or a rubber tube, and the flexible conductive medium includes a metal wire, a metal sheet, a metal mesh, a conductive coating, a conductive fiber, a conductive carbon wire or other conductive materials.

[0015] In one embodiment, the shaft of the roller assembly comprises a metal material, a plastic or a carbon fiber material.

[0016] In one embodiment, the shaft of the roller assembly and the flexible conductive tube are filled with a filling medium, which can be one or more than one medium.

[0017] In one embodiment, a transmission block is further included for positioning the shaft and the flexible conductive tube. The shaft of the roller assembly is connected with the flexible conductive tube through the transmission block, and a conductive ring in communication with the flexible conductive tube is further arranged on the shaft.

[0018] In one embodiment, the roller assembly is connected with a rotating device to drive the rotation of the roller assembly.

[0019] A plating system using the above roller assembly further comprises:

[0020] An electroplating tank is provided with an electroplating solution therein;

[0021] A lower roller set is arranged in the electroplating tank, and the lower roller set comprises a plurality of lower rollers for supporting the workpiece to be electroplated;

[0022] The workpiece to be electroplated is arranged above the lower roller set and below the roller assembly, the lower roller set or the roller assembly drives the workpiece to be electroplated to move horizontally, the liquid level of the electroplating solution in the electroplating tank is in contact with the lower surface of the workpiece to be electroplated, and does not submerge the upper surface of the workpiece to be electroplated.

[0023] In one of the embodiments, the electroplating tank is provided with an electrode opposite to the roller assembly in electric property, and the electrode is in contact with the electroplating solution.

[0024] In one of the embodiments, the workpiece to be electroplated is a solar cell, and the roller assembly is in contact with the upper surface of the solar cell or the grid lines on the upper surface of the solar cell.

[0025] In one of the embodiments, the roller assembly is in surface-to-surface contact with the solar cell.

[0026] In one of the embodiments, the lower roller set is connected with a rotating device to drive the workpiece to be electroplated to move.

[0027] In one of the embodiments, the outer surface of the roller assembly is attached with the electroplating solution in contact with the grid lines.

[0028] In one of the embodiments, one side of the roller assembly is further provided with a liquid supplementing device to continuously supplement the roller assembly with the liquid.

[0029] The beneficial effects of the present application are as follows:

[0030] The present application has the advantages of compact and reasonable structure, easy operation, and various combinations of the shaft of the roller assembly, the flexible conductive pipe and the filling medium, which can improve the contact area between the roller assembly and the surface of the workpiece to be electroplated, and further improve the conductive efficiency and the electroplating effect, and better adhere to the uneven surface of the solar cell and the grid lines, thereby realizing uniform electroplating.

[0031] (1) The roller assembly can be used as one of the driving wheels to provide power for the movement of the solar cell, and when the linear speed of the roller assembly rotation is consistent with the linear speed of the horizontal movement of the solar cell, the risk of scratching the surface of the solar cell is avoided, and further, when multiple roller assemblies are arranged, the movement of the solar cell is not affected.

[0032] (2) Since the outer diameter of the shaft of the roller assembly is smaller than the inner diameter of the outer layer of the roller assembly, that is, there is a gap between the shaft of the roller assembly and the flexible conductive tube, even after the shaft of the roller assembly is combined with the flexible conductive tube, as long as the flexible conductive tube is not rigid, the roller assembly is also not rigid, which makes the roller assembly can be in flexible contact with the solar cell, and then the flexible conductive can be realized, that is, the conductive can be ensured, and the flexible contact can be realized, even if the surface of the workpiece to be electroplated has certain unevenness or uneven thickness, the roller assembly can also maintain good contact with it, thereby realizing uniform current distribution and electroplating effect.

[0033] (3) Further, since the shaft of the roller assembly of the utility model does not directly contact the flexible conductive tube, the gravity medium is filled between the shaft of the roller assembly and the flexible conductive tube, and the flexible conductive tube deviates from the center of the shaft under the action of the gravity medium and sinks downward, thereby increasing the conductive contact area and improving the electroplating effect.

[0034] (4) The roller assembly of the utility model has the feature of sinking slightly in most applications, so during work, the electroplating liquid in the electroplating tank can be brought to the upper surface of the solar cell, thereby improving the contact effect and improving the electroplating effect. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a structural schematic view of the roller assembly of the utility model.

[0036] Figure 2 It is a force schematic view of the flexible conductive tube of the roller assembly of the utility model.

[0037] Fig. 3(a) is a schematic view of the contact between the rigid roller in the prior art and the solar cell.

[0038] Fig. 3(b) is a schematic view of the cross section of the deformation of the roller assembly of the utility model after contacting the solar cell.

[0039] Figure 4 It is a schematic view of the electroplating system of the utility model.

[0040] Among them: 100, roller assembly; 200, electroplating tank; 300, lower roller set; 400, solar cell; 500, electroplating anode; 700, line contact; 800, point contact; 900, rigid roller;

[0041] 101, shaft; 102, filling medium; 103, flexible conductive tube; 104, transmission block. DETAILED DESCRIPTION

[0042] The specific implementation manner of the utility model will be described below in combination with the drawings.

[0043] The embodiment relates to the technical field of electroplating, and particularly relates to an electroplating process of a fragile workpiece such as a solar cell piece 400, and provides a roller assembly and an electroplating system, aiming at solving the problems of solar cell piece breakage, uneven electroplating and scratches caused by the use of metal rollers in the prior art.

[0044] Figure 1 The roller assembly 100 in the embodiment is shown in the figure, which guarantees good electric conductivity and realizes flexible contact with the workpiece to be electroplated, thereby effectively avoiding the problems of solar cell piece breakage and uneven electroplating caused by traditional metal rollers.

[0045] The roller assembly 100 mainly comprises a shaft core 101, a flexible electrically-conductive pipe 103 and a transmission block 104. The shaft core 101 is a core component for driving the flexible electrically-conductive pipe to rotate. The shaft core 101 is made of a material which is not easy to deform, such as a metal rod or a metal pipe, a carbon fiber rod or a carbon fiber pipe, or a hard plastic rod or a hard plastic pipe. Preferably, the shaft core is a metal rod or a metal pipe, such as a stainless steel rod or a stainless steel pipe, or a titanium rod or a titanium pipe, which has the advantages of not being easy to deform and can be used as an electrically-conductive material to link an electrically-conductive port outside the electroplating tank 200 and the flexible electrically-conductive pipe 103. The electroplating power supply or the electricity generated by the solar cell piece is transmitted to the flexible electrically-conductive pipe 103 through the electrically-conductive port and the shaft core 101.

[0046] The flexible electrically-conductive pipe in the embodiment is sleeved on the shaft core 101, the outer surface of the flexible electrically-conductive pipe 103 is flexible and contacts the surface of the workpiece to be electroplated, and is used for transmitting electric current to the surface of the workpiece to be electroplated; the flexible electrically-conductive pipe 103 is a flexible pipe. The flexible electrically-conductive pipe 103 can be a single-layer pipe, such as an electrically-conductive rubber pipe or an electrically-conductive plastic pipe. The flexible electrically-conductive pipe 103 can also be a multi-layer pipe, such as spraying other electrically-conductive materials on the outer surface of a general flexible pipe, for example, spraying an electrically-conductive layer on the outer surface of a flexible plastic pipe. Further, the flexible electrically-conductive pipe 103 of the roller assembly 100 of the utility model can also be a flexible pipe wrapped with a layer of electrically-conductive material, such as wrapping a stainless steel foil on a flexible plastic pipe or wrapping carbon filaments on a flexible plastic pipe. Further, the layer of electrically-conductive material wrapped on the flexible pipe can be selected from metal wires, metal sheets, metal meshes or electrically-conductive plating layers, etc. In the embodiment, a strip-shaped metal sheet is adopted and is in contact with the outer surface of the flexible pipe in a winding manner, the metal sheet is arranged to cross the outer surface of the flexible pipe, and the two ends of the metal sheet are connected to the shaft core 100 respectively, thereby improving the electrically-conductive efficiency.

[0047] The roller assembly 100 of the utility model further comprises a transmission block 104. Figure 1As shown, the inner diameter of the flexible conductive tube 103 is larger than the outer diameter of the shaft 100, or in other words, there is a gap between the flexible conductive tube 103 and the shaft 100. Therefore, one of the functions of the transmission block 104 in the roller assembly 100 of the present application is to transmit the rotational power of the shaft to the flexible conductive tube 103. Most solid materials can be used as the material of the transmission block 104 of the roller assembly 100 of the present application. When the gap between the flexible conductive tube 103 and the shaft 100 is filled with the liquid medium 102, the transmission block 104 of the present application can also be used as a seal to prevent the liquid medium 102 from leaking.

[0048] Figure 2 The force diagram of the flexible conductive tube 103 of the roller assembly 100 of the present application is shown. One of the features of the flexible conductive tube 103 of the roller assembly 100 of the present application is that the flexible conductive tube 103 deforms under its own gravity or the gravity of the filled medium. Specifically, the flexible conductive tube 103 of the roller assembly 100 of the present application can sink under the action of various gravities. The sinking degree of the flexible conductive tube 103 can be achieved by optimizing the material and thickness of the flexible conductive tube 103. The optimization scheme of the present application is to fill various media 102, such as liquid medium, between the shaft 100 and the flexible conductive tube 103 of the roller assembly, and use the gravity of the various media 102 to deform the flexible conductive tube 103. In summary, the appropriate deformation of the flexible conductive tube 103, or the appropriate sinking degree, can be achieved by optimizing the material of the flexible conductive tube 103, the thickness of the flexible conductive tube 103, the amount of liquid medium 102 added, and the density of the liquid medium.

[0049] Figure 3 shows a cross-sectional view of the roller assembly 100 of the present application after deformation contacting the solar cell. As shown in Figure 3(a), when the existing rigid roller 900 contacts the solar cell 400, the existing rigid roller 900 and the solar cell 400 are point contact 800 in cross-section, and are line contact in the length direction of the rigid roller 900, i.e. the contact area of the rigid roller 900 and the solar cell 400 is a line. As shown in Figure 3(b), since the flexible conductive tube 103 of the present application is flexible, it deforms and sinks under its own gravity or the gravity of the filled medium 102, resulting in line contact 700 between the roller assembly 100 of the present application and the solar cell 400 in cross-section, and surface contact in the length direction of the roller assembly 100 of the present application. Obviously, the surface contact in the length direction of the roller assembly 100 of the present application increases the conductive contact area, i.e. improves the plating efficiency.

[0050] In another embodiment, the shaft 101 is provided with a conductive ring in communication with the flexible conductive tube 103, which serves as an interface for current input or output, and is connected to an external power source or other parts of the electroplating system. Meanwhile, the flexible conductive tube 103 can also be directly connected to the shaft 101.

[0051] In another embodiment, the transmission block 104 is made of conductive material, in which case the conductive ring can be abandoned, and the flexible conductive tube 103 is directly connected to the transmission block 104.

[0052] When the roller assembly 100 is in operation, the current is transmitted to the outer surface of the flexible conductive tube 103 through the shaft 101 or the conductive ring, and then forms an electrical contact with the solar cell 400 to be electroplated. Due to the presence of the flexible conductive tube 103, even if the surface of the solar cell to be electroplated has some unevenness or uneven thickness, the flexible conductive tube 103 can still maintain good contact with it, thereby achieving uniform current distribution and electroplating effect.

[0053] In this embodiment, in order to cooperate with the movement of the solar cell during the electroplating process, the shaft 101 is also connected to a rotating device. The rotating device can be a motor or other mechanism capable of driving the shaft 101 to rotate. Through the driving of the rotating device, the roller assembly 100 can drive the workpiece to be electroplated to move horizontally in the electroplating tank 200, ensuring the smooth progress of the electroplating process. This is because the contact area between the roller assembly 100 and the solar cell to be electroplated is large, and if the roller assembly 100 does not rotate, the friction will be very large. At the same time, the active rotation of the roller assembly 100 provides a moving direction for the solar cell to be electroplated and a vertical downward force, which can improve the efficiency of conveying and the contact area between the roller assembly 100 and the solar cell to be electroplated.

[0054] Figure 4 An electroplating system in this embodiment is shown, and the present embodiment also provides an electroplating system using the above-mentioned roller assembly 100, which can achieve efficient and uniform electroplating of fragile workpieces such as solar cells.

[0055] The electroplating system in this embodiment mainly includes an electroplating tank 200, a lower roller group 300, a roller assembly 100, a solar cell 400, an electroplating anode 500, and an electroplating power source 600.

[0056] The electroplating system in this embodiment includes a plurality of conductive roller assemblies 100, and the shafts of the plurality of roller assemblies 100 are in the same horizontal plane.

[0057] The lower roller group 300 includes a plurality of lower rollers in the same horizontal plane, and the solar cell to be electroplated 400 is interposed between the roller assembly 100 and the lower roller 300.

[0058] In this embodiment, the upper end surface of the solar cell to be plated is in contact with the flexible conductive tube 103 of the roller assembly 100.

[0059] The plating bath 200 contains plating solution for providing metal ions and electrolyte environment required for plating. The lower roller set 300 is arranged in the plating bath 200, which includes a plurality of lower rollers for supporting the workpiece to be plated. These lower rollers not only support and transport the workpiece, but also drive the movement of the workpiece in the plating bath 200 through their rotating motion.

[0060] The roller assembly 100 in this embodiment is arranged above the plating bath 200 and works in cooperation with the lower roller set 300. The workpiece to be plated is placed between the roller assembly 100 and the lower roller set 300, and moves horizontally through the driving of both.

[0061] In this embodiment, the liquid level of the plating solution is in contact with the lower surface of the workpiece to be plated, but does not submerge the upper surface, thereby ensuring that the plating process only occurs on the lower surface of the workpiece.

[0062] In this embodiment, the workpiece to be plated is a solar cell 400, and the surface of the solar cell 400 is provided with grid lines opened by laser. In the plating system, the roller assembly 100 is in contact with the upper surface of the solar cell 400 or the grid lines on the upper surface. Since the roller assembly 100 has good flexibility and conductivity, it can closely match the surface topography of the workpiece and achieve uniform current distribution. Meanwhile, the plating bath 200 is also provided with an electrode-electroplating anode 500 opposite to the roller assembly 100 in electrical property, which is in contact with the plating solution and forms an electric field environment required for plating.

[0063] When the plating system starts to work, the current from the DC power supply 600 flows through the electroplating anode 500 to the workpiece to be plated 400, and then flows into the roller assembly 100, and finally flows back to the DC power supply 600, completing a current loop. In this process, the metal ions (such as copper ions) in the plating solution move towards the cathode (i.e. the workpiece to be plated) under the action of the electric field, and deposit on the surface to form a copper electrode. Due to the good contact between the roller assembly 100 and the workpiece 400 and the uniformity of current distribution, uniform copper deposition on the surface of the workpiece can be achieved.

[0064] The roller assembly 100 provided in this embodiment can well solve this problem. Due to the presence of the flexible conductive tube 103, the roller assembly 100 can closely match the surface topography of the solar cell 400, including the grid lines, thereby achieving uniform plating at the grid lines. This not only improves the quality of plating, but also ensures the photoelectric conversion efficiency and service life of the solar cell 400.

[0065] In this embodiment, the lower roller is connected with a rotating device, which can be a motor, a chain wheel and chain or other mechanism capable of driving the lower roller to rotate. Through the driving of the rotating device, the lower roller 300 can drive the workpiece to be electroplated to move horizontally in the electroplating tank 200, cooperating with the roller assembly 100. At the same time, the rotating speed and direction of the lower roller 300 can also be adjusted according to the requirements of the electroplating process to achieve the best electroplating effect.

[0066] Through the active rotation of the roller assembly 100, the contact area between the roller assembly 100 and the solar cell 400 is improved, that is, a face-to-face structure connection mode is realized, thereby improving the efficiency of conduction, and the flexible conductive pipe 103 can better fit the surface of the solar cell 400, tightly fit the uneven surface and grid lines, and improve the uniformity of electroplating.

[0067] Moreover, the design of the roller assembly 100 and the cooperation transmission between the lower roller make the contact between the roller assembly 100 and the solar cell 400 more gentle, effectively avoiding the damage and scratches caused by traditional metal rollers.

[0068] In this embodiment, the outer surface of the roller assembly 100 is attached with electroplating liquid that contacts the grid line electroplating tank. When the roller assembly 100 contacts the surface of the solar cell 400, the electroplating liquid attached to the surface of the roller assembly 100 will penetrate into the grid line electroplating tank, thereby improving the contact area between the roller assembly 100 and the grid line electroplating tank, and in turn better improving the conduction performance.

[0069] In another embodiment, the roller assembly 100 is also provided with a liquid supplementing device that continuously supplements the roller assembly with liquid. Because the roller assembly 100 will consume the electroplating liquid on its surface after continuously contacting the solar cell 400, a liquid supplementing device is needed to supplement the liquid at all times. The liquid supplementing device can supplement the roller assembly 100 with electroplating liquid in a spraying or brushing manner, thereby realizing long-term stable operation.

[0070] In this embodiment, the electroplating system is single-sided electroplating. After electroplating one side, the other side of the solar cell 400 can be electroplated by adjusting the direction. At this time, the upper end grid lines that have been electroplated are protruding outward. The conductive brush in the background art will also cause wear to the grid lines, but the flexible feature of the roller assembly 100 in this application can better adapt to the protruding grid lines, also increasing the contact area and improving the electroplating effect.

[0071] The following gives a specific embodiment for further illustration:

[0072] Embodiment 1: The roller assembly 100 includes a shaft 101 and a flexible conductive tube 103. The shaft 101 is made of copper material, which has good electrical conductivity and mechanical strength. The flexible conductive tube 103 is made of conductive rubber material, which not only ensures flexibility but also ensures electrical conductivity. The outer surface of the flexible conductive tube 103 is connected with a metal mesh as a conductive medium. The shaft 101 is tightly connected with the flexible conductive tube 103 through a transmission block 104, and a conductive ring is arranged on the transmission block 104 disc as a conductor between the shaft 101 and the flexible conductive tube 103. The shaft 101 is also connected with a motor as a rotating device for driving the rotation of the roller assembly 100.

[0073] Embodiment 2: A plating system includes the roller assembly 100 in embodiment 1, including a plating tank 200, a lower roller set 300, and the roller assembly 100. The plating tank 200 contains a copper ion-containing plating solution. The lower roller set 300 is composed of multiple copper lower rollers and is driven to rotate by a chain wheel and chain. The solar cell 400 to be plated is placed between the roller assembly 100 and the lower roller set 300, and the liquid level of the plating solution is in contact with the lower surface of the solar cell 400. The roller assembly 100 is in close contact with the upper surface of the solar cell 400 and the grid lines, forming good electrical contact. The roller assembly 100 is connected to the cathode of a direct current power supply 600, and the plating anode 500 is also arranged in the plating tank 200. The plating anode 500 is connected to the positive electrode of the direct current power supply. When the plating system starts to work, the current flows from the anode plate into the plating solution, then flows through the solar cell 400 to the roller assembly and the shaft, and finally flows back to the power supply. In this process, the copper ions in the plating solution move to the solar cell under the action of the electric field and deposit on the lower surface of the solar cell, forming a copper electrode. Due to the close contact between the roller assembly 100 and the solar cell 400 and the uniformity of current distribution, uniform copper deposition can be achieved on the surface of the solar cell 400.

[0074] As can be seen from the above embodiments, the roller assembly 100 and the plating system of the present embodiment have significant technical advantages and practical application value. It not only solves the problems of damage, uneven plating and scratches caused by traditional metal rollers, but also improves the quality and efficiency of plating, providing a new solution for the plating process of fragile workpieces such as solar cell pieces.

[0075] The above description is an explanation of the present utility model, not a limitation of the utility model. The scope of the present utility model is defined in the claims, and any form of modification within the scope of the present utility model is possible.

Claims

1. A roller assembly, characterized by The structure comprises: a shaft; a flexible conductive tube, which is sleeved outside the shaft and contacts the surface of the workpiece to be electroplated, for transmitting electric current to the surface of the workpiece to be electroplated.

2. The roller assembly of claim 1, wherein: The flexible conductive tube is a single-layer flexible conductive tube and has flexibility, and comprises a single-layer conductive rubber tube or a single-layer conductive plastic.

3. The roller assembly of claim 1, wherein: The flexible conductive tube is a multi-layer flexible conductive tube composed of a flexible non-conductive tube and a flexible conductive medium, wherein the flexible non-conductive tube can be a plastic tube or a rubber tube, and the flexible conductive medium comprises a metal wire, a metal sheet, a metal mesh, a conductive coating, a conductive fiber and a conductive carbon wire.

4. The roller assembly of claim 1, wherein: The shaft of the roller assembly comprises a metal material, a plastic or a carbon fiber material.

5. The roller assembly of claim 1, wherein: The shaft of the roller assembly and the flexible conductive tube are filled with a filling medium, and the filling medium can be one or more than one medium.

6. The roller assembly of claim 1, wherein: The roller assembly further comprises a transmission block for positioning the shaft and the flexible conductive tube, the shaft of the roller assembly is connected with the flexible conductive tube through the transmission block, and the shaft is further provided with a conductive ring in communication with the flexible conductive tube.

7. The roller assembly of claim 1, wherein: The roller assembly is connected with a rotating device for driving the roller assembly to rotate.

8. An electroplating system using the roller assembly according to any one of claims 1-7, further comprising: an electroplating tank, in which an electroplating solution is arranged; a lower roller set arranged in the electroplating tank, the lower roller set comprising a plurality of lower rollers for supporting the workpiece to be electroplated; wherein the workpiece to be electroplated is arranged above the lower roller set and below the roller assembly, the lower roller set or the roller assembly drives the workpiece to be electroplated to move horizontally in cooperation with the lower roller set, the liquid surface of the electroplating solution in the electroplating tank contacts the lower surface of the workpiece to be electroplated and does not submerge the upper surface of the workpiece to be electroplated.

9. A plating system as claimed in claim 8, characterized in that: The electroplating tank is provided with an electrode opposite to the roller assembly in electric property, and the electrode contacts the electroplating solution.

10. A plating system as claimed in claim 8, characterized in that: The workpiece to be electroplated is a solar cell, and the roller assembly contacts the upper surface of the solar cell or the grid lines on the upper surface of the solar cell.

11. A plating system as claimed in claim 10, characterized in that: The roller assembly contacts the solar cell in a face-to-face manner.

12. A plating system as claimed in any of claims 9 to 11, characterized in that: The roller assembly is connected with a rotating device for driving the roller assembly to rotate.

13. A plating system as claimed in claim 12, characterized in that: The outer surface of the roller assembly is attached with the electroplating solution which contacts the grid line electroplating tank.

14. A plating system as claimed in claim 13, characterized in that: One side of the roller assembly is further provided with a liquid supplementing device for continuously supplementing the roller assembly with the liquid.

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