Manufacturing method of grid line and mask thereof, photovoltaic cell and assembly and system thereof

Abstract

The invention is suitable for the technical field of photovoltaic cells, and provides a manufacturing method of a grid line and a mask thereof, a photovoltaic cell and a module and system thereof. The manufacturing method of the grid line mask comprises the following steps: providing a battery substrate of which the grid line mask is to be manufactured, wherein the working surface of the battery substrate comprises a grid line area and a non-grid line area; placing the battery substrate in the working groove; in the working groove, liquid materials are attached to the whole working face; curing the liquid material attached to the working surface to form a coating; the coating of the grid line area is removed, a grid line mask is formed in the non-grid line area, and the grid line mask covers the edge area of the working face. Therefore, the battery substrate does not need to be placed on the table top of the workbench, the workbench cannot be polluted when the coating is manufactured, mask manufacturing of other battery substrates cannot be affected, the edge area of the working face can be covered by the mask, the situation that the grid line material is accumulated in the edge area and is difficult to remove during electroplating is avoided, and the risk of poor electrical property such as short circuit can be reduced.

Description

Technical Field

[0001] This application belongs to the technical field of photovoltaic cells, and particularly relates to a method for manufacturing grid lines and their masks, a photovoltaic cell and its components and systems. Background Art

[0002] To fabricate the grid lines of a photovoltaic cell, related technologies typically use processes such as film pressing and screen printing to create a mask on the cell substrate, and then an electroplating process is employed to fabricate the grid lines in the areas of the cell substrate exposed by the mask.

[0003] However, processes such as film pressing and screen printing must be carried out on the workbench surface. To prevent the mask from overflowing from the edge of the cell substrate and contaminating the workbench surface, making cleaning difficult and interfering with the fabrication of other photovoltaic cells, the edge area of the cell substrate must be left blank when making the mask. In this way, the final formed mask cannot cover the edge area of the photovoltaic cell, making it easy for the grid line material to accumulate in the edge area of the photovoltaic cell during electroplating, which is difficult to remove and easily leads to electrical defects such as short circuits.

[0004] Based on this, how to fabricate a mask for the grid lines to cover the edge area of the photovoltaic cell has become an urgent problem to be solved. Summary of the Invention

[0005] This application provides a method for manufacturing grid lines and their masks, a photovoltaic cell and its components and systems, aiming to solve the problem of how to fabricate a mask for the grid lines to cover the edge area of the photovoltaic cell.

[0006] The method for manufacturing the grid line mask provided by this application includes:

[0007] Providing a cell substrate on which a grid line mask is to be fabricated, the working surface of the cell substrate including a grid line area and a non-grid line area;

[0008] Placing the cell substrate in a working tank;

[0009] In the working tank, attaching a liquid material over the entire working surface;

[0010] Curing the liquid material attached to the working surface to form a coating;

[0011] Removing the coating in the grid line area, and forming a grid line mask in the non-grid line area, the grid line mask covering the edge area of the working surface.

[0012] Specifically, before the step of placing the cell substrate in the working tank, the manufacturing method includes:

[0013] Placing the cell substrate on a transfer mechanism;

[0014] Placing the cell substrate in the working tank includes:

[0015] Transport the battery substrate to the working tank by using the transport mechanism;

[0016] After the step of uniformly attaching the liquid material to the working surface in the working tank and before the step of curing the liquid material attached to the working surface to form a coating, the manufacturing method includes:

[0017] Use the transport mechanism to transport the battery substrate attached with the liquid material from the working tank to the curing tank.

[0018] Specifically, the transport mechanism includes a horizontal transport mechanism, and the horizontal transport mechanism includes at least one of rollers and belts;

[0019] Alternatively, the transport mechanism includes a non-horizontal transport mechanism, and the non-horizontal transport mechanism includes at least one of a flower basket and a robotic arm.

[0020] Specifically, the working surface includes a first surface and a second surface opposite to each other of the battery substrate. Uniformly attaching the liquid material to the working surface in the working tank includes:

[0021] Immerse the battery substrate in the liquid material in the working tank, and the liquid material adheres to the first surface and the second surface.

[0022] Specifically, the working surface includes a first surface or a second surface opposite to each other of the battery substrate. Uniformly attaching the liquid material to the working surface in the working tank includes:

[0023] Float the battery substrate on the liquid material in the working tank, and the liquid material adheres to the first surface or the second surface.

[0024] Specifically, uniformly attaching the liquid material to the working surface in the working tank includes:

[0025] Spray the liquid material onto the working surface of the battery substrate in the working tank.

[0026] Specifically, curing the liquid material attached to the working surface to form a coating includes:

[0027] Perform a drying treatment on the liquid material attached to the working surface to volatilize the solvent in the liquid material.

[0028] Specifically, the temperature of the drying treatment is 50°C - 100°C, and the duration of the drying treatment is greater than or equal to 10 s.

[0029] Specifically, the thickness of the coating is 0.1 μm - 5 μm.

[0030] Specifically, removing the coating in the gate line region includes:

[0031] Removing the coating in the gate line region by using a laser.

[0032] Specifically, the power of the laser is 0.5w - 10w.

[0033] Specifically, the liquid material includes a solution, and the solute of the solution includes at least one of resin and kaolin, and the solvent of the solution includes at least one of acetone and PMA.

[0034] The method for manufacturing a gate line provided by this application includes:

[0035] Providing a battery substrate provided with a gate line mask, the gate line mask is made by using the manufacturing method of the gate line mask in any one of the above, and the gate line region is covered with a seed layer;

[0036] Adopting an electroplating process to manufacture a gate line on the seed layer exposed from the gate line mask.

[0037] Specifically, after the step of manufacturing a gate line on the seed layer exposed from the gate line mask by using the electroplating process, the manufacturing method includes:

[0038] Removing the gate line mask by using an alkali solution.

[0039] Specifically, after the step of removing the gate line mask by using an alkali solution, the manufacturing method includes:

[0040] Removing the seed layer in the non - gate line region by using an acid solution or an alkali solution.

[0041] The photovoltaic cell provided by this application is characterized in that the gate line of the photovoltaic cell is made by using the manufacturing method of the gate line in any one of the above.

[0042] The battery module provided by this application includes the photovoltaic cell in any one of the above.

[0043] The photovoltaic system provided by this application includes the battery module in any one of the above.

[0044] In the method for manufacturing a gate line and its mask, a photovoltaic cell, its module and system according to the embodiments of this application, since the coating is made on the entire surface by using a liquid material in a working tank, there is no need to place the battery substrate on the tabletop of the workbench. When making the coating, it will not contaminate the workbench and affect the mask making of other battery substrates. It can cover the edge region of the working surface of the mask, avoid the accumulation of gate line materials at the edge region during electroplating and make it difficult to remove, thereby reducing the risk of electrical defects such as short - circuit, and is conducive to the batch production of gate line masks. Description of the Drawings

[0045] Figure 1 is a schematic flowchart of a method for manufacturing a gate line mask according to an embodiment of the present application;

[0046] Figure 2 is a schematic flowchart of a method for manufacturing a gate line mask according to an embodiment of the present application;

[0047] Figure 3 is a schematic flowchart of a method for manufacturing a gate line according to an embodiment of the present application;

[0048] Figure 4 is a schematic flowchart of a method for manufacturing a gate line according to an embodiment of the present application;

[0049] Figure 5 is a schematic flowchart of a method for manufacturing a gate line according to an embodiment of the present application. Detailed implementation manners

[0050] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application. In addition, it should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0051] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0052] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0053] In the description of the present application, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection capable of mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0054] In the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0055] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use scenarios of other materials.

[0056] In the present application, since the coating is made entirely on the working groove using a liquid material, there is no need to place the battery substrate on the tabletop of the workbench. When making the coating, the workbench will not be contaminated, which will not affect the mask making of other battery substrates. The mask can cover the edge area of the working surface, avoiding the accumulation of grid line materials in the edge area during electroplating, which is difficult to remove. Therefore, the risk of electrical defects such as short circuits can be reduced, which is beneficial to the batch production of grid line masks.

[0057] Embodiment 1

[0058] Please refer to Figure 1 , the method for manufacturing a grid line mask according to an embodiment of the present application includes: [[ID=ID=18]]

[0059] Step S11: Provide a battery substrate for which a grid line mask is to be manufactured. The working surface of the battery substrate includes a grid line area and a non-grid line area;

[0060] Step S13: Place the battery substrate in the working tank;

[0061] Step S14: In the working tank, attach the liquid material over the entire working surface.

[0062] Step S16: Cure the liquid material attached to the working surface to form a coating.

[0063] Step S17: Remove the coating in the grid line area and form a grid line mask in the non-grid line area. The grid line mask covers the edge area of the working surface.

[0064] In the method for manufacturing the grid line mask according to the embodiment of the present application, since the coating is made over the entire surface by using the liquid material in the working tank, it is not necessary to place the battery substrate on the tabletop of the workbench. When making the coating, the workbench will not be contaminated, which affects the mask manufacturing of other battery substrates. The mask can cover the edge area of the working surface, avoiding the accumulation of grid line materials in the edge area during electroplating, which is difficult to remove. Therefore, the risk of electrical defects such as short circuits can be reduced, which is beneficial to the batch manufacturing of the grid line mask.

[0065] Specifically, grid lines are formed on the battery substrate to form a photovoltaic cell. The photovoltaic cell can be a PERC cell, an HJT cell, a TOPCon cell, or other types of cells. The photovoltaic cell can be a double-sided contact cell or a back contact cell. The specific form of the battery substrate or the photovoltaic cell is not limited herein.

[0066] Specifically, in step S11, the working surface refers to the surface of the battery substrate to be covered with the grid line mask.

[0067] Further, in the case where the photovoltaic cell is a double-sided contact cell, grid lines need to be made on both surfaces of the battery substrate. Both surfaces of the battery substrate can be used as the working surface, and the mask manufacturing method of the grid line mask according to the embodiment of the present application can be used to make the mask, thereby making the grid lines; or one surface of the battery substrate can be used as the working surface, and the mask manufacturing method of the grid line mask according to the embodiment of the present application can be used to make the mask, thereby making the grid lines, and the other surface can use other methods to make the grid lines.

[0068] Further, in the case where the photovoltaic cell is a back contact cell, grid lines need to be made on the back surface of the battery substrate. The back surface of the battery substrate can be used as the working surface, and the mask manufacturing method of the grid line mask according to the embodiment of the present application can be used to make the mask, thereby making the grid lines.

[0069] Specifically, the number of grid line areas on the working surface can be one or more. The number of non-grid line areas on the working surface can also be one or more. This is not limited herein.

[0070] Specifically, the grid line area of the working surface is covered with a seed layer. In this way, when making grid lines subsequently, it is possible to use the electroplating process to make grid lines on the seed layer. It can be understood that the seed layer can cover all or part of the area of the battery substrate.

[0071] Specifically, in step S13, the working tank is a groove. In this way, the working tank can accommodate the battery substrate and the liquid material, facilitating the attachment of the liquid material to the battery substrate in the working tank, and can also reduce the risk of the liquid material overflowing from the working tank during the attachment process.

[0072] Specifically, the working tank can include the groove of a trough machine, the groove of a chain machine, or the groove of other equipment. The specific form of the working tank is not limited here.

[0073] Specifically, in step S14, the liquid material refers to a solution-like material. In this way, the liquid material has high fluidity, and there is no need to use a lamination process or a screen printing process to attach the liquid material to the working surface on the workbench. Therefore, there is no need to leave a blank edge on the battery substrate, and it is possible to attach the liquid material to the entire surface of the working surface in the working tank.

[0074] Specifically, in step S14, the full-surface attachment means that the liquid material comes into contact with the entire surface of the working surface. It can be understood that after the entire surface of the working surface comes into contact with the liquid material, due to the influence of gravity or other factors, some of the liquid material may slide away from some areas of the working surface, which does not represent a limitation on the full-surface attachment.

[0075] Specifically, in step S16, to cure the liquid material attached to the working surface, the solvent in the liquid material can be volatilized to form a solid coating.

[0076] Please note that the liquid material can be attached to the entire surface of the working surface once and then cured to form a coating. It is also possible to attach the liquid material to the entire surface of the working surface once and then cure it, and then attach the liquid material again and cure it. The number of times of attaching the liquid material and curing is not limited here.

[0077] Specifically, in step S17, the coating in the grid line area is removed, and the remaining coating in the non-grid line area forms a grid line mask. That is to say, the grid line mask covers the non-grid line area.

[0078] Specifically, in step S17, the edge area of the working surface refers to the area close to the outer edge of the working surface. Further, the width of the edge area is 0.1 mm - 0.3 mm. For example, it can be 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.25 mm, 0.3 mm. The width of the edge area refers to the distance from the boundary of the edge area close to the inner side of the battery to the outer edge of the battery. In this way, the range of the edge area is appropriate, which can avoid a large amount of area that cannot conduct current through the grid lines due to an overly wide edge area, and can also avoid a poor effect of reducing the short - circuit risk due to an overly narrow edge area.

[0079] Specifically, in step S17, the edge area of the working surface is a continuous area along the outer edge of the working surface. In this way, it is ensured that the edge of the working surface will not accumulate grid - line materials during electroplating, minimizing the risk of electrical defects such as short - circuits. It can be understood that in other embodiments, the edge area of the working surface can also be multiple discontinuous areas.

[0080] Embodiment Two

[0081] Please refer to Figure 2 , in some embodiments, before step S13, the manufacturing method includes:

[0082] Step S12: Place the battery substrate on the transfer mechanism;

[0083] Step S13 includes:

[0084] Step S131: Use the transfer mechanism to transport the battery substrate to the working tank;

[0085] After step S14 and before step S16, the manufacturing method includes:

[0086] Step S15: Use the transfer mechanism to transport the battery substrate with the liquid material attached from the working tank to the curing tank.

[0087] In this way, the transfer mechanism can be used to transport the battery substrate without manual participation, which is beneficial to improving the manufacturing efficiency and reducing the risk of fragmentation.

[0088] Specifically, in step S12, a robotic arm can be used to place the battery substrate on the transfer mechanism. A conveyor belt can also be used to transport the battery sheet to the transfer mechanism.

[0089] Specifically, in step S131 and step S15, the transfer mechanism moves, driving the loaded battery substrate to move to the working tank and the curing tank.

[0090] Specifically, the transfer mechanism can transport one or more battery substrates at a time.

[0091] Embodiment Three

[0092] In some embodiments, the transfer mechanism includes a horizontal transfer mechanism, and the horizontal transfer mechanism includes at least one of rollers and belts. In other words, the horizontal transfer mechanism includes one or both of rollers and belts.

[0093] In this way, the liquid material will not flow due to gravity, enabling the liquid material to adhere more evenly to the battery substrate and reducing the risk of the liquid material sliding off from some areas of the battery substrate.

[0094] Specifically, the horizontal transfer mechanism refers to a mechanism that transfers the battery substrate in the horizontal direction.

[0095] In some embodiments, the transfer mechanism includes a non-horizontal transfer mechanism, and the non-horizontal transfer mechanism includes at least one of a flower basket and a robotic arm. In other words, the horizontal transfer mechanism includes one or both of a flower basket and a robotic arm.

[0096] In this way, various forms of transfer mechanisms are provided, which is beneficial to adapting to more actual production scenarios.

[0097] Specifically, the non-horizontal transfer mechanism refers to a mechanism in which the battery substrate moves in a non-horizontal direction during the transfer of the battery substrate.

[0098] Embodiment Four

[0099] In some embodiments, the working surface includes a first surface and a second surface opposite to each other of the battery substrate, and step S14 includes:

[0100] Immerse the battery substrate in the liquid material in the working tank, and the liquid material adheres to the first surface and the second surface.

[0101] In this way, the liquid material will cover the battery substrate, so that both the first surface and the second surface of the battery substrate are in contact with the liquid material, thereby facilitating and quickly attaching the liquid material to the two working surfaces, which is beneficial to improving the production efficiency.

[0102] Specifically, the liquid material can be made to cover the transfer mechanism arranged in the working tank. When the transfer mechanism drives the carried battery substrate to move in the working tank, both surfaces of the battery substrate will come into contact with the liquid material.

[0103] Furthermore, fixing members can be provided on the transfer mechanism. The fixing members are, for example, suction cups, mesh bags, etc. In this way, the battery substrate is prevented from floating in the liquid material and detaching from the transfer mechanism.

[0104] Embodiment Five

[0105] In some embodiments, the working surface includes the first surface or the second surface opposite to each other of the battery substrate, and step S14 includes:

[0106] The battery substrate is floated on the liquid material in the working tank, and the liquid material adheres to the first surface or the second surface.

[0107] In this way, the battery substrate floating on the liquid material has only one side in contact with the liquid material, so that the liquid material can be attached to a working surface conveniently and quickly, which is conducive to improving production efficiency.

[0108] Specifically, the battery substrate can be fed into the liquid material in the working tank. The liquid material flows in the working tank, adheres to the battery substrate and drives the battery substrate to move. After the battery substrate is out of the tank, it can be taken over by the transmission mechanism and transported to the curing tank.

[0109] Embodiment 6

[0110] In some embodiments, step S14 includes:

[0111] Spray liquid material onto the working surface of the battery substrate in the working tank.

[0112] In this way, by spraying, the liquid material can be efficiently attached to the working surface, which is beneficial to improving production efficiency. Moreover, the working tank can accommodate the liquid material that is not attached to the battery substrate, which is convenient for reuse and helps reduce costs.

[0113] Specifically, the spraying pressure is 0.1kg-5kg, for example, 0.1kg, 0.2kg, 0.8kg, 1kg, 1.5kg, 2kg, 2.5kg, 4kg, 4.8kg, and 5kg. This ensures that the spraying pressure is within an appropriate range, avoiding spraying failure due to too little pressure and fragmentation due to too much pressure.

[0114] In some embodiments, step S14 includes applying a liquid material to the working surface of the battery substrate within the working tank. Specifically, the application may include spin coating, rod coating, or the like. This provides a wider range of methods for applying the liquid material, facilitating adaptation to a wider range of practical production scenarios.

[0115] Embodiment 7

[0116] In some embodiments, step S16 includes:

[0117] The liquid material attached to the working surface is dried to volatilize the solvent in the liquid material.

[0118] In this way, by drying and volatilizing the solvent in the liquid material, the liquid material is transformed into a solid coating and fixed on the working surface of the battery substrate.

[0119] It can be understood that in other embodiments, the solvent in the liquid material can also be volatilized by standing still. The standing time is greater than or equal to 5 minutes. In this way, it is possible to avoid incomplete volatilization of the solvent caused by too short a standing time.

[0120] Embodiment VIII

[0121] In some embodiments, the temperature of the drying treatment is 50°C - 100°C, and the duration of the drying treatment is greater than or equal to 10 s.

[0122] In this way, the temperature of the drying treatment is within a suitable range, which can avoid slow curing and incomplete solvent volatilization caused by too low a temperature, and can also avoid wasting energy caused by too high a temperature. Moreover, the drying duration is within a suitable range, which can avoid incomplete solvent volatilization caused by too short a drying duration.

[0123] Specifically, the temperature of the drying treatment is, for example, 50°C, 52°C, 60°C, 80°C, 90°C, 98°C, 100°C.

[0124] Specifically, the duration of the drying treatment is, for example, 10 s, 12 s, 15 s, 20 s, 25 s.

[0125] Embodiment IX

[0126] In some embodiments, the thickness of the coating is 0.1 μm - 5 μm. For example, it is 0.1 μm, 0.2 μm, 0.8 μm, 1 μm, 1.5 μm, 2 μm, 3 μm, 4 μm, 4.8 μm, 5 μm.

[0127] In this way, the thickness of the coating is within a suitable range, which can avoid the inability to achieve insulation shielding and affecting electroplating caused by too thin a coating, and can also avoid wasting materials and affecting the contact between the gate line and the electroplating cathode caused by too thick a coating.

[0128] Preferably, the thickness of the coating is 2 μm - 2.5 μm. For example, it is 2 μm, 2.1 μm, 2.2 μm, 2.3 μm, 2.4 μm, 2.5 μm. In this way, the thickness of the coating is further optimized, taking into account the shielding effect and material saving, and the overall effect is better.

[0129] Embodiment X

[0130] In some embodiments, step S17 includes:

[0131] Removing the coating in the gate line area by using a laser.

[0132] In this way, the removal of the coating is more flexible, which is beneficial to improving the production efficiency. Moreover, the width of the laser can be very small, so that the width of the coating removed in the gate line area can be very thin, and thus it is possible to manufacture finer gate lines.

[0133] It can be understood that in other embodiments, the coating in the gate line region can also be removed by at least one of dry etching, wet etching, and exposure and development.

[0134] Embodiment XI

[0135] In some embodiments, the power of the laser is 0.5w - 10w. For example, it is 0.5w, 1w, 3w, 5w, 8w, 10w

[0136] In this way, the power of the laser is within a suitable range, which can avoid the inability to etch the gate line mask caused by too low power, and can also avoid damaging the battery caused by too high laser power.

[0137] Embodiment XII

[0138] In some embodiments, the liquid material includes a solution. The solute of the solution includes at least one of resin and kaolin, and the solvent of the solution includes at least one of acetone and PMA.

[0139] In other words, the solute of the solution includes one or both of resin and kaolin. The solvent of the solution includes one or both of acetone and PMA.

[0140] In this way, various forms of solutes and solvents are provided, which can adapt to more actual production scenarios. Moreover, the liquid material with such a solute is easy to adhere to the battery substrate, and the solvent is easier to volatilize, which is beneficial to improving the production efficiency.

[0141] Specifically, the resin includes amino resin and epoxy resin.

[0142] Specifically, the concentration of the solution is 1% - 50%. For example, it is 1%, 2%, 10%, 25%, 30%, 48%, 50%. In this way, the concentration of the solution is within a suitable range, which can avoid the difficulty of completely covering the working surface caused by too small concentration, and can also avoid the formation of colloid, the inability to adhere in the working tank, and the need for film pressing or printing on the workbench caused by too large concentration.

[0143] Preferably, the concentration of the solution is 20% - 30%. For example, it is 20%, 22%, 25%, 28%, 30%. In this way, the concentration of the solution is further optimized, taking into account the covering effect and the difficulty of adhesion, and the overall effect is better.

[0144] Embodiment XIII

[0145] Please refer to Figure 3 , the method for manufacturing the gate line according to the embodiment of the present application includes:

[0146] Step S21: Provide a battery substrate provided with a grid line mask, where the grid line mask is made by using the manufacturing method of the grid line mask in any one of Embodiments 1 to 12, and the grid line area is covered with a seed layer;

[0147] Step S22: Use an electroplating process to fabricate grid lines on the seed layer exposed from the grid line mask.

[0148] In the manufacturing method of the grid lines in the embodiments of the present application, since the coating is fabricated over the entire surface by using a liquid material in the working tank, it is not necessary to place the battery substrate on the tabletop of the workbench. When fabricating the coating, the workbench will not be contaminated, which will not affect the mask fabrication of other battery substrates. The mask can cover the edge area of the working surface, avoiding the accumulation of grid line materials in the edge area during electroplating, which is difficult to remove. Therefore, the risk of electrical defects such as short circuits can be reduced, which is beneficial to the batch fabrication of the grid line mask.

[0149] For the explanation and description of this part, reference can be made to the foregoing text. To avoid redundancy, it will not be elaborated here.

[0150] Embodiment 14

[0151] Please refer to Figure 4 , in some embodiments, after step S22, the manufacturing method includes:

[0152] Step S23: Use an alkaline solution to remove the grid line mask.

[0153] In this way, the grid line mask can be removed simply and efficiently, which is beneficial to improving the manufacturing efficiency.

[0154] Specifically, the alkaline solution includes at least one of KOH and NaOH. In other words, the alkaline solution includes one or both of KOH and NaOH.

[0155] Specifically, the concentration of the alkaline solution is 0.1% - 10%. For example, it is 0.1%, 0.5%, 1%, 3%, 5%, 8%, 10%. In this way, the concentration of the alkaline solution is within a suitable range, which can avoid the slow removal of the mask or even the inability to remove the mask due to too low a concentration of the alkaline solution, and can also avoid the waste of materials or even damage to the battery substrate due to too high a concentration of the alkaline solution.

[0156] Embodiment 15

[0157] Please refer to Figure 5 , in some embodiments, after step S23, the manufacturing method includes:

[0158] Step S24: Use an acid solution or an alkaline solution to remove the seed layer in the non-grid line area.

[0159] In this way, the seed layer can be removed simply and efficiently, which is beneficial to improving the manufacturing efficiency.

[0160] Specifically, the acid solution includes sulfuric acid and hydrogen peroxide. The acid solution may also include sulfuric acid and sodium persulfate.

[0161] Specifically, the alkali solution may include a copper chloride solution.

[0162] Example Sixteen

[0163] For the photovoltaic cell of the embodiment of the present application, the grid lines of the photovoltaic cell are made by using the method for making grid lines according to any one of Embodiments Thirteen to Fifteen.

[0164] For the photovoltaic cell of the embodiment of the present application, since the coating is made integrally with the liquid material in the working tank, there is no need to place the battery substrate on the tabletop of the workbench, and the workbench will not be contaminated during the coating production, which will not affect the mask production of other battery substrates. The mask can cover the edge area of the working surface, avoiding the accumulation of grid line materials in the edge area during electroplating, which is difficult to remove. Therefore, the risk of electrical defects such as short circuits can be reduced, which is beneficial to the batch production of grid line masks.

[0165] Example Seventeen

[0166] The battery module of the embodiment of the present application includes the photovoltaic cell of Example Sixteen.

[0167] For the battery module of the embodiment of the present application, since the coating is made integrally with the liquid material in the working tank, there is no need to place the battery substrate on the tabletop of the workbench, and the workbench will not be contaminated during the coating production, which will not affect the mask production of other battery substrates. The mask can cover the edge area of the working surface, avoiding the accumulation of grid line materials in the edge area during electroplating, which is difficult to remove. Therefore, the risk of electrical defects such as short circuits can be reduced, which is beneficial to the batch production of grid line masks.

[0168] In this embodiment, multiple photovoltaic cells in the battery module can be connected in series in sequence to form a battery string, so as to achieve the series connection and current output of the current. For example, the series connection of photovoltaic cells can be achieved by setting welding tapes (busbars, interconnection bars), conductive backplates, etc.

[0169] It can be understood that in such an embodiment, the battery module may further include a metal frame, a backplane, photovoltaic glass, and a glue film. The glue film can be filled between the front and back of the photovoltaic cell, between the photovoltaic glass, adjacent photovoltaic cells, etc. As a filler, it can be a transparent colloid with good light transmittance and aging resistance. For example, the glue film can adopt an EVA glue film or a POE glue film, and can be specifically selected according to the actual situation, which is not limited herein.

[0170] The photovoltaic glass can be covered on the adhesive film on the front side of the photovoltaic cell. The photovoltaic glass can be ultra-white glass, which has a high light transmittance, high transparency, and excellent physical, mechanical, and optical properties. For example, the light transmittance of the ultra-white glass can reach more than 92%, and it can protect the photovoltaic cell without affecting the efficiency of the photovoltaic cell as much as possible. At the same time, the adhesive film can bond the photovoltaic glass and the photovoltaic cell together, and the presence of the adhesive film can seal and insulate the photovoltaic cell and prevent water and moisture.

[0171] The backsheet can be attached to the adhesive film on the back side of the photovoltaic cell. The backsheet can protect and support the photovoltaic cell, and has reliable insulation, water resistance, and aging resistance. The backsheet can have multiple choices, usually it can be tempered glass, plexiglass, aluminum alloy TPT composite adhesive film, etc., and its specific setting can be determined according to specific circumstances and is not limited here. The whole composed of the backsheet, the photovoltaic cell, the adhesive film, and the photovoltaic glass can be arranged on the metal frame. The metal frame is the main external support structure of the entire battery module, and can stably support and install the battery module. For example, the battery module can be installed at the required installation position through the metal frame.

[0172] Example 18

[0173] The photovoltaic system of the embodiment of the present application includes the battery module of Example 9.

[0174] In the photovoltaic system of the embodiment of the present application, since the coating is made integrally with the liquid material in the working groove, there is no need to place the battery substrate on the tabletop of the workbench. When making the coating, the workbench will not be polluted and affect the mask making of other battery substrates. The mask can cover the edge area of the working surface, avoiding the accumulation of grid line materials at the edge area during electroplating, which is difficult to remove, so that the risk of electrical defects such as short circuits can be reduced, which is beneficial to the batch production of grid line masks.

[0175] In this embodiment, the photovoltaic system can be applied in photovoltaic power stations, such as ground power stations, rooftop power stations, water surface power stations, etc., and can also be applied to devices or apparatuses that use solar energy for power generation, such as user solar power supplies, solar street lights, solar cars, solar buildings, etc. Of course, it can be understood that the application scenarios of the photovoltaic system are not limited to this, that is to say, the photovoltaic system can be applied in all fields that need to use solar energy for power generation. Taking the photovoltaic power generation system network as an example, the photovoltaic system can include a photovoltaic array, a busbar box, and an inverter. The photovoltaic array can be an array combination of multiple battery modules. For example, multiple battery modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the busbar box, and the busbar box can collect the current generated by the photovoltaic array. After the collected current flows through the inverter and is converted into alternating current required by the mains power grid, it is connected to the mains network to achieve solar power supply.

[0176] In the description of this specification, the descriptions referring to terms such as "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0177] In addition, the above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for manufacturing a gate line mask, characterized by Comprising: Providing a battery substrate for manufacturing a grid line mask, wherein the working surface of the battery substrate includes a grid line area and a non-grid line area; Placing the battery substrate in a working tank; In the working tank, attaching a liquid material over the entire working surface; Curing the liquid material attached to the working surface to form a coating; Removing the coating in the grid line area and forming a grid line mask in the non-grid line area, the grid line mask covering the edge area of the working surface.

2. The manufacturing method of the gate line mask according to claim 1, characterized in that Before the step of placing the battery substrate in the working tank, the manufacturing method includes: Placing the battery substrate on a transfer mechanism; Placing the battery substrate in the working tank includes: Transporting the battery substrate to the working tank by using the transfer mechanism; After the step of attaching the liquid material over the entire working surface in the working tank and before the step of curing the liquid material attached to the working surface to form a coating, the manufacturing method includes: Using the transfer mechanism to transport the battery substrate with the attached liquid material from the working tank to a curing tank.

3. The manufacturing method of the gate line mask according to claim 1, wherein, The transfer mechanism includes a horizontal transfer mechanism, and the horizontal transfer mechanism includes at least one of rollers and belts; Or, the transfer mechanism includes a non-horizontal transfer mechanism, and the non-horizontal transfer mechanism includes at least one of a flower basket and a robotic arm.

4. The method for manufacturing a gate line mask according to claim 1, wherein The working surface includes a first surface and a second surface opposite to each other of the battery substrate. Attaching the liquid material over the entire working surface in the working tank includes: Immersing the battery substrate in the liquid material in the working tank, and the liquid material adheres to the first surface and the second surface.

5. The manufacturing method of the gate line mask according to claim 1, characterized in that, The working surface includes a first surface or a second surface opposite to each other of the battery substrate. Attaching the liquid material over the entire working surface in the working tank includes: Floating the battery substrate on the liquid material in the working tank, and the liquid material adheres to the first surface or the second surface.

6. The manufacturing method of the gate line mask according to claim 1, wherein Attaching the liquid material over the entire working surface in the working tank includes: Spraying the liquid material onto the working surface of the battery substrate in the working tank.

7. The manufacturing method of the gate line mask according to claim 1, characterized in that, Curing the liquid material attached to the working surface to form a coating includes: Performing a drying treatment on the liquid material attached to the working surface to volatilize the solvent in the liquid material.

8. The manufacturing method of the gate line mask according to claim 7, characterized in that, The temperature of the drying treatment is 50°C - 100°C, and the duration of the drying treatment is greater than or equal to 10 s.

9. The manufacturing method of the gate line mask according to claim 1, characterized in that, The thickness of the coating is 0.1 μm - 5 μm.

10. The manufacturing method of the gate line mask according to claim 1, characterized in that Removing the coating in the grid line area includes: Removing the coating in the grid line area by using a laser.

11. The manufacturing method of the gate line mask according to claim 10, wherein The power of the laser is 0.5 w - 10 w.

12. The manufacturing method of the gate line mask according to claim 1, wherein, The liquid material includes a solution, and the solute of the solution includes at least one of resin and kaolin, and the solvent of the solution includes at least one of acetone and PMA.

13. A method for manufacturing grid lines, characterized in that, Comprising: Providing a battery substrate provided with a grid line mask, the grid line mask being made by using the grid line mask manufacturing method according to any one of claims 1 - 12, and the grid line area being covered with a seed layer; Adopting an electroplating process to manufacture grid lines on the seed layer exposed from the grid line mask.

14. The manufacturing method of the gate line according to claim 13, characterized in that After the step of fabricating the gate lines on the seed layer exposed from the gate line mask by using an electroplating process, the fabrication method includes: Removing the gate line mask by using an alkaline solution.

15. The manufacturing method of the gate line according to claim 14, wherein, After the step of removing the gate line mask by using an alkaline solution, the fabrication method includes: Removing the seed layer in the non-gate line region by using an acidic solution or an alkaline solution.

16. A photovoltaic cell, characterized in that, The gate lines of the photovoltaic cell are fabricated by using the fabrication method of the gate lines according to any one of claims 13-15.

17. A battery assembly, characterized in that, Including the photovoltaic cell according to claim 16.

18. A photovoltaic system, characterized in that, Including the battery module according to claim 17.

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