Apparatus and method for producing a photovoltaic solder strip

Abstract

The application discloses a production device and method of a coated photovoltaic welding strip, which comprises a pay-off structure, a winding structure, a tinning structure, a coating tool structure, a heating structure and a cooling structure, wherein the coating tool structure comprises an air knife and a coating die. The production device and method of the photovoltaic welding strip can realize that the volume ratio of the tin alloy in the photovoltaic welding strip is 1%-6% and the concentricity is greater than 60%.

Description

Technical Field

[0001] This application relates to the field of photovoltaic ribbon technology, and more specifically, to a photovoltaic ribbon production equipment and method. Background Technology

[0002] Photovoltaic ribbon is a key component in solar cells of the photovoltaic industry. It is used to connect the cells of photovoltaic modules and plays an important role in conducting and concentrating electricity. Therefore, the quality of photovoltaic ribbon will directly affect the energy efficiency and lifespan of solar cells.

[0003] A schematic diagram of the structure of the photovoltaic ribbon is shown below. Figure 1 As shown, the photovoltaic ribbon consists of a copper strip 10 and a tin alloy 20 coated on the surface of the copper strip 10. The volume and concentricity of the tin alloy 20 affect the quality of the photovoltaic ribbon. In photovoltaic ribbons, when the volume of the tin alloy 20 accounts for 1%-6% of the total volume of the photovoltaic ribbon and the concentricity is greater than 60%, it can achieve good application results in practical applications. However, traditional photovoltaic ribbon production equipment has an unreasonable structural design, resulting in a large volume of tin alloy 20 coated on the surface of the copper strip 10 and poor concentricity, which seriously affects the use of the photovoltaic ribbon.

[0004] Therefore, there is an urgent need to provide a new production equipment and method for photovoltaic ribbons to solve the above problems. Summary of the Invention

[0005] This application provides a production equipment and method for photovoltaic solder ribbon, which can achieve a tin alloy volume ratio of 1%-6% in the photovoltaic solder ribbon and a concentricity greater than 60%.

[0006] To solve one or more of the above-mentioned technical problems, the technical solution adopted in this application is:

[0007] This application provides a photovoltaic welding strip production equipment, including: an unwinding structure, a winding structure, a tin plating structure, a coating fixture structure, a heating structure, and a cooling structure, wherein the coating fixture structure includes an air knife and a coating mold;

[0008] The unwinding structure is used to unwind the substrate;

[0009] The winding structure is used to wind up the photovoltaic welding ribbon;

[0010] The tin-plating structure is disposed on one side of the unwinding structure and the winding structure, and molten tin is disposed inside the tin-plating structure;

[0011] The cooling structure is located on the side of the coating fixture structure away from the tin plating structure;

[0012] The air knife, the tin plating structure, and the cooling structure work together to coat the surface of the substrate with a coating to obtain an intermediate product, wherein the volume of the coating is less than 15% of the volume of the intermediate product.

[0013] The heating structure is used to heat the coating so that the coating is in a semi-molten state, the coating mold is used to remove the part of the coating in the semi-molten state, and the cooling structure is used to cool the remaining coating to obtain the photovoltaic ribbon, wherein the volume of the remaining coating accounts for 1%-6% of the volume of the photovoltaic ribbon.

[0014] Furthermore, the concentricity of the coating and the remaining coating is greater than 60%.

[0015] Furthermore, the coating mold is provided with a first through hole, the diameter of which is 5 μm larger than the diameter of the substrate.

[0016] Furthermore, the photovoltaic solder ribbon production equipment also includes a drive structure, which is connected to the coating fixture structure. The drive structure is used to drive the coating fixture structure to move along a direction that approaches or moves away from the tin plating structure.

[0017] And / or,

[0018] The photovoltaic welding strip production equipment also includes a traction structure, which is mounted on the cooling structure and is used to move the intermediate product and the photovoltaic welding strip.

[0019] Furthermore, the coating fixture structure also includes a fixture assembly, which includes a first circular fixture, a second circular fixture, a positioning shaft, and a fixture bracket. The first circular fixture and the second circular fixture are coaxially connected via the positioning shaft. One side of the fixture bracket is connected to the positioning shaft, and the other side of the fixture bracket is connected to the drive structure. The center of the first circular fixture and the center of the air knife are on the same vertical line, and the center of the second circular fixture and the center of the coating mold are on the same vertical line.

[0020] Furthermore, the coating fixture structure also includes an air knife support and a manual slide table. The air knife support is connected to the air knife, and the manual slide table is connected to the air knife support. The manual slide table is used to control the movement of the air knife in the direction of approaching or moving away from the tin plating structure.

[0021] Furthermore, the coating fixture structure also includes a coating mold straightening frame, an L-shaped positioning bracket, a connector, and a heat insulation plate. The coating mold straightening frame is L-shaped, with one side connected to the coating mold and the other side connected to the fixture bracket. One side of the L-shaped positioning bracket is connected to the coating mold straightening frame and the other side is connected to the air knife bracket. One side of the connector is connected to the drive structure and the other side is connected to the heat insulation plate. One side of the heat insulation plate is connected to the connecting plate and the other side is connected to the coating mold straightening frame.

[0022] Furthermore, the photovoltaic welding strip production equipment also includes a first main body and a first guide structure, a second guide structure, a potentiometer arm, and a controller disposed on the first main body. The unwinding structure and the winding structure are disposed on the first main body. The first guide structure is used to guide the substrate unwound by the unwinding structure to the coating fixture structure. The second guide structure is used to guide the photovoltaic welding strip to the winding structure. The controller is used to control the movement speed of the drive structure. The potentiometer arm is used to control the unwinding speed of the unwinding structure.

[0023] Furthermore, the cooling structure includes a second main body and a cooling air duct disposed on the second main body. The second main body includes a side plate and a top plate. A second through hole is provided on the side plate of the second main body near the first main body. The substrate passes through the second through hole and enters the coating fixture structure. A third through hole is provided on the top plate of the second main body. The cooling air duct passes through the third through hole and is disposed on the second main body.

[0024] Furthermore, the tin plating structure includes a movable component and a tin furnace disposed on the movable component, wherein the tin furnace contains the molten tin.

[0025] Furthermore, the heating structure is the tin furnace.

[0026] This application also provides a method for producing photovoltaic ribbon based on the above-mentioned photovoltaic ribbon production equipment, the method comprising:

[0027] S1. Unwinding the substrate using an unwinding structure;

[0028] S2. Apply a coating to the surface of the substrate using an air knife, a tin plating structure, and a cooling structure to obtain an intermediate product, wherein the volume of the coating is less than 15% of the volume of the intermediate product.

[0029] S3. The coating is heated using a heating structure to make the coating in a semi-molten state, the semi-molten part of the coating is removed using a coating mold, and the remaining coating is cooled using a cooling structure to obtain the photovoltaic ribbon, wherein the volume of the remaining coating accounts for 1%-6% of the volume of the photovoltaic ribbon;

[0030] S4. The photovoltaic welding strip is wound up using a winding structure.

[0031] According to the specific embodiments provided in this application, the following technical effects are disclosed:

[0032] This application provides a photovoltaic solder ribbon production equipment and method. First, a coating is applied to the surface of a substrate using an air knife, a tin plating structure, and a cooling structure to obtain an intermediate product. The volume of the intermediate product coating is less than 15% of its volume. Next, the coating is heated using a heating structure to bring it to a semi-molten state. The semi-molten portion of the coating is removed using a coating mold. The remaining coating is cooled using a cooling structure to obtain the photovoltaic solder ribbon. The volume of the remaining coating accounts for 1%-6% of the photovoltaic solder ribbon volume. Because the coating on the substrate surface in the intermediate product is in a crystalline state, heating the coating using the heating structure keeps it in a semi-molten state, and concentricity is maintained after passing through the coating mold. Furthermore, the volume of the remaining coating on the substrate surface can be controlled by the restriction of the coating mold.

[0033] Of course, any product implementing this application does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of the photovoltaic welding strip provided in the background art of this application;

[0036] Figure 2 A schematic diagram of the overall structure of the photovoltaic ribbon production equipment provided in this application embodiment. Figure 1 ;

[0037] Figure 3 A schematic diagram of the overall structure of the photovoltaic ribbon production equipment provided in this application embodiment. Figure 2 ;

[0038] Figure 4 Schematic diagram of the coating tooling structure and driving structure provided in the embodiments of this application. Figure 1 ;

[0039] Figure 5 Schematic diagram of the coating tooling structure and driving structure provided in the embodiments of this application. Figure 2 ;

[0040] Figure 6 Schematic diagram of the coating tooling structure and driving structure provided in the embodiments of this application. Figure 3 ;

[0041] Figure 7 This is a schematic diagram of the coating mold provided in an embodiment of this application;

[0042] Figure 8 A flowchart illustrating the production process of photovoltaic welding ribbon provided in this application embodiment. Detailed Implementation

[0043] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art are within the scope of protection of this application.

[0044] As described in the background section, photovoltaic solder ribbon consists of copper strip and a tin alloy coated on the surface of the copper strip. The volume and concentricity of the tin alloy affect the quality of the photovoltaic solder ribbon. In photovoltaic solder ribbon, a good application effect can only be achieved when the volume of the tin alloy accounts for 1%-6% of the total volume of the photovoltaic solder ribbon and the concentricity is greater than 60%. However, traditional photovoltaic solder ribbon production equipment has an unreasonable structural design, resulting in a large volume of tin alloy coated on the copper strip surface and poor concentricity, which seriously affects the use of the photovoltaic solder ribbon.

[0045] In response, this application provides a production equipment and method for photovoltaic solder ribbon, which can achieve a tin alloy volume ratio of 1%-6% in the photovoltaic solder ribbon and a concentricity greater than 60%.

[0046] The following will describe the specific implementation examples.

[0047] Example 1

[0048] To address the aforementioned problems, this application creatively proposes a production equipment for photovoltaic welding strips, such as... Figure 2 As shown, and also refer to Figure 3 The photovoltaic welding strip production equipment includes an unwinding structure 100, a winding structure 200, a tin plating structure 300, a coating fixture structure 400, a cooling structure 500, and a heating structure 900. The coating fixture structure 400 includes an air knife 410 and a coating mold 420.

[0049] Specifically, the unwinding structure 100 is used to unwind the substrate 30, and the winding structure 200 is used to wind the photovoltaic welding strip 40. A motor is also provided on one side of the winding structure 200 to drive its rotation. The output end of the motor is connected to the rotating shaft of the winding structure 200, thus providing winding power to the winding structure 200. It should be noted that the substrate 30 mentioned in this application includes copper strip.

[0050] The tin-plating structure 300 is disposed on one side of the unwinding structure 100 and the winding structure 200. The tin-plating structure 300 contains molten tin, which includes a tin alloy. Immersing the substrate 30 into the molten tin yields a photovoltaic solder ribbon 40 with a tin coating on its surface.

[0051] In existing technologies, photovoltaic solder ribbons consist of a copper strip 10 and a tin alloy 20 coated on the surface of the copper strip 10. The volume and concentricity of the tin alloy 20 affect the quality of the photovoltaic solder ribbon. In photovoltaic solder ribbons, a good application effect is achieved when the volume of the tin alloy 20 accounts for 1%-6% of the total volume of the photovoltaic solder ribbon and the concentricity is greater than 60%. However, traditional photovoltaic solder ribbon production equipment has an unreasonable structural design, resulting in the volume of the tin alloy 20 coated on the surface of the copper strip 10 being approximately 15% of the total volume of the copper strip 10 and tin alloy 20, and the concentricity being less than 60%.

[0052] To address this issue, this application first applies a coating to the surface of the substrate 30 using an air knife 410, a tin plating structure 300, and a cooling structure 500 to obtain an intermediate product. The concentricity of the coating is greater than 60%, and the volume of the coating is less than 15% of the volume of the intermediate product. Next, the coating is heated using a heating structure 900 to bring it to a semi-molten state. The coating in the semi-molten state is removed using a coating mold 420, and the remaining coating is cooled using a cooling structure 500 to obtain a photovoltaic ribbon 40. The concentricity of the remaining coating is greater than 60%, and the volume of the remaining coating accounts for 1%-6% of the volume of the photovoltaic ribbon 40.

[0053] In specific implementation, the air knife 410, the tin-plating structure 300, and the cooling structure 500 cooperate to coat the surface of the substrate 30 with a coating to obtain an intermediate product. The concentricity of the coating is greater than 60%, and the volume of the coating is less than 15% of the volume of the intermediate product. In this embodiment, the air knife 410 is an annular air knife. It is understood that the annular air knife is only an example of an air knife in this embodiment and not a limiting description. Without departing from the inventive concept of this application, any known type of air knife can be used as the air knife in this application.

[0054] As a preferred implementation, the air knife 410 sprays inert gas, which can blow excess molten tin on the surface of the substrate 30 back to the tin-plating structure 300, ensuring that the coating on the surface of the substrate 30 meets the process requirements. In addition, the inert gas sprayed by the air knife 410 protects the tin-plated substrate 30, reduces the generation of tin oxide, improves the solderability of the solder strip, and reduces production costs.

[0055] The heating structure 900 heats the coating to bring it to a semi-molten state. The coating mold 420 removes the partially molten coating. The cooling structure 500 cools the remaining coating to obtain the photovoltaic ribbon 40. The concentricity of the remaining coating is greater than 60%, and the volume of the remaining coating accounts for 1%-6% of the volume of the photovoltaic ribbon 40. Since the coating on the surface of the substrate 30 in the intermediate product is in a crystalline state, heating the coating using the heating structure 900 can bring it to a semi-molten state, and concentricity can be maintained after passing through the coating mold 420. Furthermore, the volume of the remaining coating on the surface of the substrate 30 can be controlled by the restriction of the coating mold 420.

[0056] Example 2

[0057] Based on Example 1, this example further details the tin plating structure, coating tooling structure, cooling structure, and heating structure.

[0058] like Figure 2 and Figure 3 As shown, the tin plating structure 300 includes a moving mechanism 310 and a tin furnace 320 disposed on the moving mechanism 310, with molten tin inside the tin furnace 320. By placing the tin furnace 320 on the moving mechanism 310, it is convenient to change different types of tin furnaces 320 according to the actual process. In this embodiment, the moving mechanism 310 includes a moving trolley, the lower part of which is provided with pulleys, and the pulleys are also provided with stop buckles. The stop buckles can lock the pulleys in the working position, preventing errors caused by the instability of the pulleys.

[0059] like Figure 7 As shown, the coating mold 420 is provided with a first through hole 421 for the intermediate product to pass through. When the intermediate product passes through the first through hole 421 on the coating mold 420, excess molten solder can be blocked back into the solder pot 320. The size of the first through hole 421 can control the volume of the coating on the surface of the substrate 30. In this embodiment, the diameter of the first through hole 421 is 5 μm larger than the diameter of the substrate 30. If the diameter of the first through hole 421 is too small, it is easily blocked by particles or impurities in the solder ribbon, and a large amount of copper powder will be deposited in the solder pot 320, which is also difficult to handle.

[0060] like Figure 4 As shown, and also refer to Figures 5-6The coating fixture structure 400 also includes a fixture assembly 430, which includes a first circular fixture 431, a second circular fixture 432, a positioning shaft 433, and a fixture bracket 434. The first circular fixture 431 and the second circular fixture 432 are coaxially connected through the positioning shaft 433. One side of the fixture bracket 434 is connected to the positioning shaft 433, and the other side of the fixture bracket 434 is connected to the drive structure 600. The center of the first circular fixture 431 and the center of the air knife 410 are on the same vertical line, and the center of the second circular fixture 432 and the center of the coating mold 420 are on the same vertical line.

[0061] Furthermore, the coating fixture structure 400 also includes an air knife support 440 and a manual slide 450. The air knife support 440 is connected to the air knife 410, and the manual slide 450 is connected to the air knife support 440. The manual slide 450 is used to control the movement of the air knife 410 towards or away from the tin plating structure 300. Specifically, the manual slide 450 includes a guide rail and a slider. The linear positioning movement of the air knife 410 can be achieved by sliding the slider on the guide rail.

[0062] Furthermore, the coating fixture structure 400 also includes a coating mold straightening frame 460, an L-shaped positioning bracket 470, a connector 480, and a heat insulation plate 490. Specifically, the coating mold straightening frame 460 is L-shaped, with one side connected to the coating mold 420 and the other side connected to the fixture bracket 434. The L-shaped positioning bracket 470 is connected to the coating mold straightening frame 460 on one side and to the air knife bracket 440 on the other side. The connector 480 is connected to the drive structure 600 on one side and to the heat insulation plate 490 on the other side. The heat insulation plate 490 is also connected to the connector 480 on one side and to the coating mold straightening frame 460 on the other side. The heat insulation plate 490 prevents heat from being transferred to the drive structure 600 and affecting its normal operation.

[0063] The cooling structure 500 includes a second main body 510 and a cooling air duct 520 disposed on the second main body 510. The second main body 510 includes a first side plate 511, a second side plate 512, a third side plate 513, and a top plate 514. The first side plate 511 and the third side plate 513 are arranged parallel to each other. One end of the second side plate 512 is connected to the first side plate 511, and the other end of the second side plate 512 is connected to the third side plate 513. The first side plate 511 is close to the first main body 800, and the third side plate 513 is away from the first main body 800. A second through hole 515 is provided on the first side plate 511, through which the substrate 30 enters the coating fixture structure 400. A third through hole 530 is provided on the top plate 514, through which the cooling air duct 520 is disposed on the second main body 510.

[0064] Furthermore, the photovoltaic soldering ribbon production equipment also includes a drive structure 600, which is connected to the coating fixture structure 400. The drive structure 600 is used to drive the coating fixture structure 400 to move in a direction close to or away from the tin plating structure 300. In this embodiment, the drive structure 600 includes a lifting electric cylinder, which has advantages such as precise control, high efficiency, high reliability, and environmental protection and energy saving. The lifting electric cylinder can precisely control the movement speed and displacement of the coating fixture structure 400, so that part of the coating fixture structure 400 is entirely or partially located in the molten solder of the tin furnace 320.

[0065] Furthermore, the photovoltaic welding strip production equipment also includes a traction structure 700, which is mounted on the cooling structure 500 and is used to move the intermediate product and the photovoltaic welding strip 40.

[0066] Furthermore, the photovoltaic welding strip production equipment also includes a first main body 800 and a first guide structure 810, a second guide structure 820, a potentiometer arm 830, and a controller 840 disposed on the first main body 800. An unwinding structure 100 and a winding structure 200 are disposed on the first main body 800. The first guide structure 810 guides the substrate 30 unwound by the unwinding structure 100 to the coating fixture structure 400. The second guide structure 820 guides the photovoltaic welding strip 40 to the winding structure 200. The controller 840 controls the movement speed of the drive structure 600, and the potentiometer arm 830 controls the unwinding speed of the unwinding structure 100. In a preferred embodiment, the first guide structure 810 includes three guide wheels, with the height of the middle guide wheel lower than the height of the two side guide wheels. Because the height of the middle guide wheel is lower than the height of the two side guide wheels, the substrate 30 is kept taut under the weight of the middle guide wheel, thereby preventing wrinkles in the substrate 30. Similarly, the second guide structure 820 also includes three guide wheels, with the middle guide wheel being lower in height than the two side guide wheels. Because the middle guide wheel is lower in height than the two side guide wheels, the photovoltaic welding ribbon 40 is kept taut under the weight of the middle guide wheel, thus preventing wrinkles from forming in the photovoltaic welding ribbon 40.

[0067] In a preferred embodiment, the heating structure 900 is a tin furnace 320. After the intermediate product briefly enters the tin furnace 320, the coating is in a semi-molten state, and the inner layer of the coating has not completely melted. In this state, the concentricity can be maintained after passing through the coating mold 420. This application uses the same tin furnace 320 for both the tin plating process and the heating process, which can reduce the size of the equipment.

[0068] For the parts of Embodiment 2 that are not detailed, please refer to the descriptions in the foregoing embodiments, which will not be repeated here.

[0069] Example 3

[0070] Based on Embodiment 1 and Embodiment 2, this embodiment also provides a method for producing photovoltaic welding strips.

[0071] like Figure 8 As shown, a method for producing photovoltaic welding ribbon includes:

[0072] S1. Unwind the substrate using an unwinding structure.

[0073] It should be noted that the substrate 30 mentioned in this application includes copper strip.

[0074] S2. A coating is applied to the surface of the substrate using an air knife, a tin plating structure, and a cooling structure to obtain an intermediate product. The volume of the coating is less than 15% of the volume of the intermediate product.

[0075] In specific implementation, the substrate 30 is unwound from the unwinding structure 100 and enters the first circular fixture 431 through the second through hole 515. During this process, the first circular fixture 431 is kept completely immersed in the molten tin in the tin furnace 320. The tin furnace 320 is kept at the temperature of the molten tin in the molten state. Then, it passes through the air knife 410, vertically upward through the cooling air channel 520 and the traction structure 700 to complete the coating and obtain the intermediate product. The intermediate product includes the substrate 30 and the coating applied to the surface of the substrate 30. The concentricity of the coating is greater than 60%, and the volume of the coating is less than 15% of the volume of the intermediate product.

[0076] S3. The coating is heated using a heating structure to bring it to a semi-molten state. The semi-molten portion of the coating is removed using a coating mold. The remaining coating is cooled using a cooling structure to obtain the photovoltaic ribbon. The volume of the remaining coating accounts for 1%-6% of the volume of the photovoltaic ribbon.

[0077] In practice, the intermediate product enters the second circular fixture 432 downwards, while the second circular fixture 432 remains completely submerged in the molten solder in the solder pot 320. It then enters the coating mold 420, which floats horizontally on the surface of the molten solder in the solder pot 320. Passing through the coating mold 420, the semi-molten portion of the coating is removed. Because the coating remains semi-molten after briefly entering the tin-plating structure 300, the inner layer of the coating does not completely melt. In this state, passing through the coating mold 420 maintains concentricity. The solder ribbon passing through the coating mold 420 maintains a certain temperature and is not crystallized. Passing upwards through the cooling duct 520, the coating can be fully crystallized to obtain the photovoltaic solder ribbon 40.

[0078] It should be noted that the heating structure 900 is preferably a tin furnace 320. The molten tin in the tin furnace 320 can heat the coating of the intermediate product so that the coating is in a semi-molten state. Using the same tin furnace 320 for the tin plating process and the heating process can reduce the size of the equipment.

[0079] S4. The photovoltaic welding strip is wound up using a winding structure.

[0080] For the parts of Embodiment 3 that are not detailed, please refer to the descriptions in the foregoing embodiments, which will not be repeated here.

[0081] The production equipment and method for photovoltaic welding strips provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and its core ideas. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

[0082] In the description of this application, it should be understood that the terms "vertical," "parallel," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0083] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0084] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An apparatus for producing a photovoltaic solder strip, characterized by, The production equipment of the photovoltaic solder strip comprises a unwinding structure, a winding structure, a tinning structure, a coating tool structure, a heating structure and a cooling structure, wherein the coating tool structure comprises an air knife and a coating die. The unwinding structure is used for unwinding a base material. The winding structure is used for winding the photovoltaic solder strip. The tinning structure is arranged on one side of the unwinding structure and the winding structure, and tin liquid is arranged in the tinning structure. The cooling structure is arranged on the side of the coating tool structure away from the tinning structure. The air knife, the tinning structure and the cooling structure are matched to coat a coating layer on the surface of the base material to obtain an intermediate product, and the volume of the coating layer is less than 15% of the volume of the intermediate product. The heating structure is used for heating the coating layer to make the coating layer in a semi-molten state, the coating die is used for removing part of the coating layer in the semi-molten state, and the cooling structure is used for cooling the remaining coating layer to obtain the photovoltaic solder strip, and the volume of the remaining coating layer accounts for 1%-6% of the volume of the photovoltaic solder strip. A first through hole is arranged on the coating die, and the diameter of the first through hole is 5μm larger than the diameter of the base material. The production equipment of the photovoltaic solder strip further comprises a driving structure connected with the coating tool structure, and the driving structure is used for driving the coating tool structure to move in the direction approaching or away from the tinning structure. The coating tool structure further comprises a tool assembly, the tool assembly comprises a first circular tool, a second circular tool, a positioning shaft and a tool support, the first circular tool and the second circular tool are coaxially connected through the positioning shaft, one side of the tool support is connected with the positioning shaft, the other side of the tool support is connected with the driving structure, the center of the first circular tool is on the same vertical line with the center of the air knife, and the center of the second circular tool is on the same vertical line with the center of the coating die. The coating tool structure further comprises an air knife support connected with the air knife, and a manual sliding table connected with the air knife support, and the manual sliding table is used for controlling the air knife to move in the direction approaching or away from the tinning structure. The coating layer and the remaining coating layer have a concentricity of greater than 60%.

2. The photovoltaic solder strip production apparatus according to claim 1, wherein 3. The production equipment of the photovoltaic solder strip according to claim 1, wherein the production equipment of the photovoltaic solder strip further comprises a traction structure arranged on the cooling structure, and the traction structure is used for pulling the intermediate product and the photovoltaic solder strip to move. ​ ​ 4. The photovoltaic solder strip production apparatus according to claim 1, wherein The coating tool structure further comprises a coating mold correcting frame, an L-shaped positioning support, a connecting piece and a heat insulation plate, the coating mold correcting frame is L-shaped, one side of the coating mold correcting frame is connected with the coating mold, the other side of the coating mold correcting frame is connected with the tool support, one side of the L-shaped positioning support is connected with the coating mold correcting frame, the other side of the L-shaped positioning support is connected with the air knife support, one side of the connecting piece is connected with the driving structure, the other side of the connecting piece is connected with the heat insulation plate, one side of the heat insulation plate is connected with the connecting piece, and the other side of the heat insulation plate is connected with the coating mold correcting frame.

5. The photovoltaic solder strip production apparatus according to claim 3, wherein The production equipment of the photovoltaic welding strip further comprises a first main body, a first guide structure, a second guide structure, a potentiometer swing arm and a controller arranged on the first main body, the unwinding structure and the winding structure are arranged on the first main body, the first guide structure is used for guiding the base material unwound by the unwinding structure to the coating tool structure, the second guide structure is used for guiding the photovoltaic welding strip to the winding structure, the controller is used for controlling the movement speed of the driving structure, and the potentiometer swing arm is used for controlling the unwinding speed of the unwinding structure.

6. The photovoltaic solder strip production apparatus according to claim 5, wherein The cooling structure comprises a second main body and a cooling air duct arranged on the second main body, the second main body comprises a side plate and a top plate, a second through hole is formed in the side plate of the second main body close to the first main body, the base material passes through the second through hole to enter the coating tool structure, and a third through hole is formed in the top plate of the second main body, and the cooling air duct passes through the third through hole and is arranged on the second main body.

7. The photovoltaic solder strip production apparatus according to any one of claims 1 to 6, characterized in that, The tinning structure comprises a moving assembly and a tin furnace arranged on the moving assembly, and the tin liquid is arranged in the tin furnace.

8. The photovoltaic solder strip production apparatus according to claim 7, wherein The heating structure is the tin furnace.

9. A method for producing a photovoltaic solder strip based on a production apparatus for a photovoltaic solder strip according to any one of claims 1 to 8, characterized in that, The production method of the photovoltaic welding strip comprises the following steps: S1, unwinding a base material by using an unwinding structure; S2, coating a coating layer on the surface of the base material by using an air knife, a tinning structure and a cooling structure to obtain an intermediate product, the volume of the coating layer is less than 15% of the volume of the intermediate product; S3, heating the coating layer by using a heating structure to make the coating layer in a semi-molten state, removing part of the coating layer in the semi-molten state by using a coating mold, and cooling the remaining coating layer by using a cooling structure to obtain the photovoltaic welding strip, the volume of the remaining coating layer accounts for 1%-6% of the volume of the photovoltaic welding strip; S4, winding the photovoltaic welding strip by using a winding structure.

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