Horizontal electroplating device for photovoltaic cell
By attaching magnetic fluid material to the conductive roller to improve the contact of the photovoltaic cell, the problem of poor contact in the prior art is solved, and a more efficient electroplating effect and lower production costs are achieved.
Patent Information
- Application Number
- CN202422377206.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-09-29
AI Technical Summary
In existing horizontal electroplating equipment for photovoltaic cells, the contact between the laser-grooved area of the TOPCon cell and the conductive roller is poor, especially the textured structure on the front side, which makes it difficult to achieve uniform contact, affecting the integrity and conductivity of the electroplating.
Magnetic fluid material is used as the conductive medium. By attaching the magnetic fluid material to the conductive roller, the conductivity and fluidity of the magnetic fluid are used to improve the contact with the photovoltaic cell. Combined with the hollow design of the conductive roller with built-in magnetic material, good conductive contact is formed.
The contact effect between the photovoltaic cell and the conductive roller is improved, the quality of the electroplating product is improved, the resistance is reduced and the production cost is reduced.
Smart Images
Figure CN223386254U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of horizontal electroplating of photovoltaic cells, in particular to a horizontal electroplating device for photovoltaic cells. Background Art
[0002] The power generation principle of photovoltaic cells is: under light, electrons concentrate on the front side and positive charges concentrate on the back side, and are collected by the metal grid lines on the front and back sides respectively, and the electrical energy is transmitted to the external circuit through the metal grid lines.
[0003] Currently in the photovoltaic field, the grid lines on the surface of crystalline silicon cells are all made by screen-printing silver paste. Since the principle of screen printing itself determines that the size of the grid lines cannot be too thin, the density limitation of screen printing results in the grid line resistance not being too low, and the cost of the silver paste grid lines is also relatively high.
[0004] Compared to screen-printed electrodes, electroplated electrodes have a wider aspect ratio and better conductivity, which reduces the internal resistance of the battery and reduces losses such as shading, thereby further improving the photoelectric conversion efficiency of photovoltaic cells. Electroplated electrodes can also significantly reduce the production cost of photovoltaic cells. Currently, photovoltaic cell electroplating includes two methods: horizontal and vertical. The vertical method requires a fixture and clamping points, which makes it difficult to ensure the integrity of the electroplating. Therefore, horizontal electroplating is the more widely adopted method.
[0005] Taking the existing TOPCon battery single-sided horizontal electroplating solution as an example, a conductive roller is often used to form a conductive contact with the cathode. However, in the specific implementation, the following problems exist:
[0006] The contact between the laser-grooved area of the TOPCon cell and the conductive roller is generally poor. In particular, the textured structure on the front of the cell makes uniform contact even more difficult. Utility Model Content
[0007] In the above context, the present invention proposes a horizontal electroplating device for photovoltaic cells, comprising an electroplating tank and a transmission roller, wherein the transmission roller is installed above the electroplating tank. The horizontal electroplating device for photovoltaic cells also comprises a magnetic fluid tank and a conductive roller, wherein the conductive roller is installed above the magnetic fluid tank, and the conductive roller is in contact with the liquid in the magnetic fluid tank and is electrically connected to the photovoltaic cell.
[0008] The idea of the utility model is to use magnetic fluid material as a conductive medium to improve the cathode conductive contact mode;
[0009] The conductive roller is hollow and contains a built-in magnetic material, which allows the magnetic fluid to adhere to the surface of the conductive roller. These two methods improve the contact between the photovoltaic cell and the conductive roller.
[0010] Preferably, the electroplating tank is an overflow tank.
[0011] Preferably, the installation height of the electroplating tank is higher than that of the magnetic fluid tank.
[0012] Preferably, magnetic fluid is added into the magnetic fluid tank, and the magnetic fluid is used to achieve electrical connection between the conductive roller and the photovoltaic cell.
[0013] Preferably, plating solution is added into the electroplating tank, and the liquid level of the plating solution in the electroplating tank is higher than the liquid level of the magnetic fluid in the magnetic fluid tank.
[0014] Preferably, the conductive roller is a hollow roller.
[0015] Preferably, a magnetic material for magnetically absorbing magnetic fluid is added to the hollow portion of the conductive roller.
[0016] Preferably, more than two groups of magnetic fluid tanks and electroplating tanks are provided in the traveling direction of the photovoltaic cells.
[0017] The beneficial effects of this utility model are as follows: Compared with the existing technology, the photovoltaic cell horizontal electroplating device of this utility model has a structural improvement. Through the secondary design of the conductive roller to make it magnetic, a layer of magnetic fluid material is attached to the surface of the conductive roller. The magnetic fluid material's excellent conductivity and amorphous properties are utilized to form a good conductive contact with the laser-grooved area of the TOPCon cell. The magnetic fluid material's fluidity and amorphous properties enable good conductive contact with the cathode surface. The magnetic fluid material adheres to the surface of the conductive roller without contaminating the plating solution. This utility model is suitable for use in photovoltaic cell horizontal electroplating schemes. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 Showing a schematic structural diagram of an electroplating tank;
[0019] Figure 2 A schematic structural diagram of a magnetic fluid tank is shown;
[0020] Figure 3 Shows a schematic structural diagram of the conductive roller;
[0021] Figure 4 A schematic structural diagram of a photovoltaic cell horizontal electroplating device is shown.
[0022] Description of reference numerals:
[0023] 1- electroplating tank, 2- magnetic fluid tank, 3- transmission roller, 4- conductive roller, 5- photovoltaic cell, 6- hollow part, 7- magnetic fluid, 8- plating solution. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. The components of the embodiments of the present application generally described in the drawings and shown in the technical solutions can be arranged and designed in various different configurations.
[0025] Here, the exemplary specific implementation methods and descriptions of this application are used to explain this application, but are not intended to limit this application.
[0026] The photovoltaic cell horizontal electroplating device of the present invention is described in detail below with reference to the accompanying drawings.
[0027] The process principle of TOPCon cells is based on the tunnel oxide passivated contact (Tunnel Oxide Passivated Contact) solar cell technology based on the principle of selective carriers. Its cell structure is an N-type silicon substrate cell. An ultra-thin layer of silicon oxide is prepared on the back of the cell, and then a thin layer of doped polycrystalline silicon is deposited. The two together form a passivated contact structure, which effectively reduces surface recombination and metal contact recombination, providing greater room for further improvement of the conversion efficiency of N-PERT cells.
[0028] See Figure 1 、 Figure 2 、 Figure 3 The photovoltaic cell horizontal electroplating device of this embodiment includes two main components: an electroplating tank 1 and a magnetic fluid tank 2.
[0029] A transmission roller 3 is provided above the electroplating tank 1 . The transmission roller 3 is a non-conductive roller and is only used for transportation.
[0030] The electroplating tank 1 is an overflow tank, and the plating solution 8 is added inside. The liquid level of the plating solution 8 in the electroplating tank 1 is higher than the liquid level of the magnetic fluid in the magnetic fluid tank 2. The function of the overflow tank is to make the plating solution 8 fully contact with the photovoltaic cell and to remove impurities generated during the electroplating process in the matching recovery tank.
[0031] A magnetic fluid tank 2 is provided behind the electroplating tank 1 , into which magnetic fluid liquid 7 is added, and the magnetic fluid liquid 7 is used to realize electrical connection between the conductive roller and the photovoltaic cell.
[0032] A conductive roller 4 is provided above the magnetic fluid tank 2, which has both the function of transporting and conducting the magnetic fluid. The conductive roller 4 is preferably a hollow structure, and the hollow portion 6 inside is filled with a magnetic material that can absorb the magnetic fluid 7.
[0033] In the prior art, the magnetic fluid liquid 7 is composed of magnetic particles (Fe, Ni, Co, etc.), a base liquid (water, organic solvent, oil, etc.) and a surfactant (oleic acid, etc.). The adsorption capacity of the conductive roller to the magnetic fluid material can be controlled by adjusting the strength of the magnetic material inside the conductive roller.
[0034] See Figure 4 In the photovoltaic cell horizontal electroplating device of this embodiment, the photovoltaic cell 5 moves above the electroplating tank 1 and the magnetic fluid tank 2 to complete the electroplating process. The installation height of the electroplating tank 1 is higher than the magnetic fluid tank 2. During the electroplating process, the photovoltaic cell 5 contacts the plating solution 8 in the electroplating tank 1, and the magnetic fluid liquid 7 is adsorbed on the conductive roller 4. The magnetic fluid 7 serves as a conductive medium to improve the cathode conductive contact effect. Specifically, in the direction of movement of the photovoltaic cell 5, multiple groups of magnetic fluid tanks 2 and electroplating tanks 1 are set according to the specifications and processes of the batteries to be processed, and the magnetic fluid tanks 2 and electroplating tanks 1 are arranged alternately. After passing through the magnetic fluid tank 2, the photovoltaic cell 5 adsorbs the magnetic fluid 7 for conductivity, and then passes through the electroplating tank 1 to complete one electroplating. After the photovoltaic cell 5 passes through the electroplating production line composed of multiple groups of magnetic fluid tanks 2 and electroplating tanks 1, the overall electroplating process is completed.
[0035] The following is a list of the usage process of the device of this embodiment:
[0036] After the TOPCon cell process is completed to the passivation anti-reflection layer coating, before metallization, it serves as the pre-processed semi-finished product of this embodiment;
[0037] The slot pattern and single-sided or double-sided slotting are determined according to the needs, with no restrictions. The laser uses one or more of ultraviolet, green, infrared, nanosecond, and picosecond lasers.
[0038] Taking the double-sided laser grooving of TOPCon semi-finished battery products as an example, first, double-sided HF pretreatment is performed. After pretreatment, the front side is facing up and horizontally passed through the magnetic fluid tank 2 and the electroplating tank 1. It is necessary to ensure that one side of the battery cell is in contact with the plating solution 8 and the other side is in contact with the magnetic fluid liquid 7 to form a conductive contact. Nickel, copper, and silver (tin) are electroplated through LIP (light-induced plating);
[0039] The semi-finished product is dried, turned over, and facing downward, and nickel, copper, and silver (or tin) are deposited in sequence through FBP (forward bias plating) in the same manner as in the previous step; finally, a photovoltaic cell product is obtained.
[0040] Compared with the electroplating device of the prior art, the device of the present invention first adsorbs the magnetic fluid 7 on the conductive roller 4, and then the conductive roller 4 is evenly contacted with the laser grooved area of the photovoltaic cell 5. The magnetic fluid 7 plays a role in improving the cathode conductive contact effect. After the photovoltaic cell 5 passes through the electroplating tank 5, the quality of the electroplated product is greatly improved.
[0041] The photovoltaic cell horizontal electroplating device of this embodiment is also applicable to other electroplating processes including single-sided electroplating. For different processes, improvements can be made to match the screen printing process.
[0042] The above description of the proposed embodiments will enable those skilled in the art to implement or use the present invention. It should be understood that the features disclosed in the above embodiments may be used individually or in combination, except where otherwise specified. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention disclosed herein is not limited to the specific embodiments disclosed, but is intended to cover modifications within the spirit and scope of the present invention as defined by the appended claims.
Claims
1. A photovoltaic cell horizontal electroplating device for forming metal electrodes of photovoltaic cells by electroplating, comprising an electroplating tank and a transmission roller, wherein the transmission roller is installed above the electroplating tank, characterized in that: The photovoltaic cell horizontal electroplating device also includes a magnetic fluid tank and a conductive roller. The conductive roller is installed above the magnetic fluid tank. The conductive roller contacts the liquid in the magnetic fluid tank and is used to electrically connect to the photovoltaic cell.
2. The photovoltaic cell horizontal electroplating device according to claim 1, characterized in that: The electroplating tank is an overflow tank.
3. The photovoltaic cell horizontal electroplating device according to claim 2, characterized in that: The installation height of the electroplating tank is higher than that of the magnetic fluid tank.
4. The photovoltaic cell horizontal electroplating device according to claim 1, characterized in that: Magnetic fluid is added into the magnetic fluid tank, and the magnetic fluid is used to realize electrical connection between the conductive roller and the photovoltaic cell.
5. The photovoltaic cell horizontal electroplating device according to claim 4, characterized in that: Plating solution is added into the electroplating tank, and the liquid level of the plating solution in the electroplating tank is higher than the liquid level of the magnetic fluid in the magnetic fluid tank.
6. The photovoltaic cell horizontal electroplating device according to claim 4, characterized in that: The conductive roller is a hollow roller.
7. The photovoltaic cell horizontal electroplating device according to claim 6, characterized in that: A magnetic material for magnetically absorbing magnetic fluid is added to the hollow portion of the conductive roller.
8. The photovoltaic cell horizontal electroplating device according to claim 1, characterized in that: In the traveling direction of the photovoltaic cells, two or more groups of magnetic fluid tanks and electroplating tanks are arranged.