Photovoltaic cell surface welding wire fixing device and fixing method

Abstract

The present invention discloses a device for fixing welding wires on the surface of a photovoltaic cell and a fixing method thereof, which relate to the technical field of photovoltaic cell production equipment, and include a loading platform, a pressing mechanism and a light-curing mechanism. The loading platform has a light-transmitting area, on which a plurality of welding wires are placed, and above which a cell is arranged. The main grid lines on the lower surface of the cell are coated with a light-curing adhesive for bonding the welding wires, and the pressing mechanism is located above the cell and is used to press tightly against the upper surface of the cell. The fixing device of the present invention can achieve bonding of the main grid lines on the surface of the cell and the welding wires without adopting a welding process, and the connection of all the main grid lines and welding wires on the surface of the cell can be completed in one processing, so that the fixing process of the welding wires is significantly simplified and the processing efficiency is higher. The present invention places both the welding wires and the cell in the light-transmitting area, and can utilize the light-curing adhesive and the light-curing mechanism for light-curing. The structure of the fixing device is simpler, and the manufacturing and maintenance costs will be greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic cell production equipment, and in particular to a photovoltaic cell surface welding wire fixing device and a fixing method thereof. Background Art

[0002] In the photovoltaic field, the current method of fixing the welding wire and the battery in existing equipment is as follows: after the welding wire is aligned and overlapped with the main grid line of the battery cell, the tin on the welding wire (tinned copper wire) is melted by high temperature to achieve the purpose of welding the welding wire and the battery cell together, such as the invention patent with application number "202210428649.8" and name "Battery Cell Round Welding Wire Pressurized Cooling Device". However, there are the following problems in the traditional welding process: 1. Generally, a carrier is required to press on the welding wire (to prevent the welding wire from moving) and follow the movement. After the welding of the welding wire is completed, the carrier reflows, and the cycle repeats. The internal structure of the machine is complex, space is occupied, and production efficiency is affected; 2. In order to ensure reliable welding of the welding wire and the battery cell, liquid flux needs to be added. The flux is easy to volatilize. Over time, the inside of the machine is particularly prone to dirt, the workpiece is corroded, and the gas path is easily blocked, requiring frequent maintenance.

[0003] Patent application number 202210828187.9, titled "A Solar Cell and Its Interconnection Method," discloses a method for bonding wire to grid lines on a solar cell, potentially reducing processing costs. However, the patent does not describe a specific device, leaving those skilled in the art unaware of how the bonding process is accomplished. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and method for fixing welding wire on the surface of a photovoltaic cell to solve the problems existing in the prior art, so that the fixing process of the welding wire is significantly simplified and the processing efficiency is higher. At the same time, the structure of the fixing device is simpler, and the manufacturing and maintenance costs will be greatly reduced.

[0005] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention provides a device for fixing welding wires on the surface of photovoltaic cell sheets, comprising a loading platform, a pressing mechanism and a light-curing mechanism, wherein the loading platform has a light-transmitting area, a plurality of welding wires are placed on the light-transmitting area, a cell sheet is arranged above the welding wires, the main grid lines on the lower surface of the cell sheet are coated with a light-curing glue for bonding the welding wires, and the main grid lines on the lower surface of the cell correspond one-to-one to the welding wires, the pressing mechanism is located above the cell sheet, and is used to press the upper surface of the cell sheet, and the light-curing mechanism is located below the light-transmitting area, and is used to cure the light-curing glue.

[0006] Preferably, the loading platform includes a frame plate and a light-transmitting plate, the frame plate is provided with an opening, the light-transmitting plate is fixed at the opening to form the light-transmitting area, and the frame plate is also provided with a welding wire placement groove, and the welding wire is located in the welding wire placement groove.

[0007] Preferably, a negative pressure adsorption hole is provided at the bottom of the welding wire placement groove, and the negative pressure adsorption hole is connected to the negative pressure adsorption equipment.

[0008] Preferably, a heating element for heating the light-transmitting plate and a thermocouple for measuring the temperature of the light-transmitting plate are provided inside the frame plate.

[0009] Preferably, the pressing mechanism includes a cylinder and a pressing plate, the end of the telescopic rod of the cylinder is floatingly connected to the pressing plate, the lower surface of the pressing plate is parallel to and spaced apart with a number of pressing bosses, a number of glue spots are provided on the upper and lower surfaces of the battery cell corresponding to the main grid line positions, and the glue spot positions on the upper surface of the battery cell are staggered with the glue spot positions on the lower surface of the battery cell, the pressing boss is perpendicular to the main grid line on the lower surface of the battery cell, and corresponds to the glue spot arrangement on the lower surface of the battery cell.

[0010] Preferably, a fixing platform is further provided on the pressing mechanism, and a plurality of adjusting bolts are connected to the fixing platform through threads. The adjusting bolts are arranged perpendicular to the upper surface of the pressing plate, and there is a gap between the ends of the adjusting bolts and the upper surface of the pressing plate.

[0011] Preferably, it further comprises a base, the light curing mechanism is fixed on the base, a linear motor is further provided on the base, an output end of the linear motor is connected to a slide, and the frame plate is provided on the slide.

[0012] Preferably, two linear motors are provided and are respectively located on two sides of the base, and a lifting mechanism is provided on each of the two slides, and the frame plate is provided at the output end of the lifting mechanism.

[0013] Preferably, it further comprises a gantry, and the pressing mechanism is fixed on the gantry.

[0014] The present invention also provides a method for fixing welding wires on the surface of photovoltaic cells, comprising the following steps:

[0015] Turn on the heating element to preheat the light-transmitting plate to the set temperature, and monitor its temperature in real time through a thermocouple to ensure that the light-transmitting plate is always within the set range;

[0016] Place the welding wire on the light-transmitting plate with the end in the welding wire placement slot, and fix the welding wire by adsorbing it through the negative pressure adsorption hole;

[0017] Apply glue on both sides of the solar panel, with the glue points corresponding to the main grid lines on both sides of the solar panel, and place the solar panel on the light-transmitting board;

[0018] The linear motor moves the frame plate to the top of the light curing mechanism, and the lifting mechanism moves the frame plate to the set height;

[0019] The cylinder moves to press the pressing plate onto the upper surface of the cell, the welding wire is attached to the main grid line on the lower surface of the cell, and the light curing mechanism is activated to cure the glue spots on the lower surface of the cell;

[0020] The pressure plate is lifted, and the linear motor drives the frame plate to reset. The linear motor on the other side of the base is activated to move the corresponding frame plate to the top of the curing mechanism for operation.

[0021] Compared with the prior art, the present invention has achieved the following technical effects:

[0022] 1. The fixing device of the present invention can achieve the bonding of the busbars on the surface of the solar cell and the welding wire without the need for welding. All the busbars on the surface of the solar cell can be connected to the welding wire in one process, which significantly simplifies the welding wire fixing process and improves the processing efficiency. The present invention places the welding wire and the solar cell in the light-transmitting area, and can use light-curing adhesive and a light-curing mechanism for light curing. The structure of the fixing device is simpler, and the manufacturing and maintenance costs will be greatly reduced.

[0023] 2. In the present invention, the pressure plate is connected to the telescopic rod of the cylinder through a fisheye bearing, so that the pressure plate can be twisted around the end of the telescopic rod. When the surface of the battery cell is not completely parallel to the lower surface of the pressure plate, the pressure plate can be twisted so that the lower surface of the pressure plate is in contact with the upper surface of the battery cell, making the force on the battery cell more uniform, which is conducive to ensuring the bonding quality of the main grid line and the welding wire;

[0024] 3. In the present invention, the lower surface of the pressure plate is parallel and spaced apart with a plurality of pressing bosses, and a plurality of glue spots are provided on the upper and lower surfaces of the battery cell at positions corresponding to the main grid lines, and the glue spots on the upper surface of the battery cell are staggered with the glue spots on the lower surface of the battery cell. The pressing bosses are arranged correspondingly to the glue spots on the lower surface of the battery cell, so that when the pressing bosses are arranged corresponding to the main grid lines on the lower surface of the battery cell, the glue spots on the upper surface of the battery cell can be avoided to avoid squeezing the glue spots on the upper surface of the battery cell;

[0025] 4. The two frame plates in the present invention can work alternately, making the structure of the fixing device more compact and the working efficiency higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 Schematic diagram of the overall structure of the fixing device in the present invention;

[0028] Figure 2 This is a schematic diagram of the explosion structure of the loading platform;

[0029] Figure 3 A structural diagram of a frame plate;

[0030] Figure 4 for Figure 3 A partial enlarged view of

[0031] Figure 5 Schematic diagram of another structure of the frame plate;

[0032] Figure 6 It is a structural diagram of the pressing mechanism;

[0033] Figure 7 for Figure 6 Cross-sectional view of AA;

[0034] Figure 8 for Figure 6 Cross-sectional view of the middle BB;

[0035] Among them, 1. welding wire; 2. battery cell; 3. glue point; 4. frame plate; 5. opening; 6. light-transmitting plate; 7. non-stick layer; 8. welding wire placement slot; 9. negative pressure adsorption hole; 10. electric heating tube; 11. thermocouple; 12. cylinder; 13. pressure plate; 14. fisheye bearing; 15. pressing boss; 16. fixed table; 17. adjusting bolt; 18. base; 19. linear motor; 20. slide; 21. lifting mechanism; 22. gantry; 23. light curing mechanism. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] The purpose of the present invention is to provide a device and method for fixing welding wire on the surface of a photovoltaic cell to solve the problems existing in the prior art, so that the fixing process of the welding wire is significantly simplified and the processing efficiency is higher. At the same time, the structure of the fixing device is simpler, and the manufacturing and maintenance costs will be greatly reduced.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example 1:

[0040] like Figures 1 to 8 As shown, this embodiment provides a device for fixing welding wires on the surface of a photovoltaic cell, including a loading platform, a pressing mechanism and a light-curing mechanism 23. The loading platform has a light-transmitting area, on which a number of welding wires 1 are placed, and a cell 2 is arranged above the welding wires 1. The main grid lines on the lower surface of the cell 2 are coated with a light-curing glue for bonding the welding wires 1, and the main grid lines on the lower surface of the cell correspond one-to-one to the welding wires 1. The pressing mechanism is located above the cell 2 and is used to press tightly on the upper surface of the cell 2. The light-curing mechanism 23 is located below the light-transmitting area and is used to cure the light-curing glue.

[0041] When in use, place the welding wire 1 on the light-transmitting area, and the arrangement direction and spacing of the welding wire 1 are the same as the main grid lines on the battery cell 2. Then press the battery cell 2 onto the welding wire 1, and the main grid lines on the lower surface of the battery cell 2 correspond one to one with the welding wire 1. After the placement is completed, the pressing mechanism presses down and presses tightly on the upper surface of the battery cell 2 to make the main grid lines fully contact with the welding wire 1, and then turn on the light curing mechanism 23, and the light curing mechanism 23 cures the light curing glue to achieve the connection between the main grid lines and the welding wire 1.

[0042] Therefore, the fixing device in this embodiment can achieve the bonding of the main grid lines on the surface of the battery cell 2 and the welding wire 1 without adopting a welding process. One processing can complete the connection of all the main grid lines on the surface of the battery cell 2 and the welding wire 1, so that the fixing process of the welding wire 1 is significantly simplified and the processing efficiency is higher; at the same time, the welding wire 1 and the battery cell 2 are placed in the light-transmitting area, and can be light-cured using light-curing glue and a light-curing mechanism 23. The structure of the fixing device is simpler, and the manufacturing and maintenance costs will be greatly reduced.

[0043] like Figure 2As shown, in this embodiment, the loading platform includes a frame plate 4 and a light-transmitting plate 6. The frame plate 4 is provided with an opening 5. The light-transmitting plate 6 is fixed at the opening 5 to form a light-transmitting area. The light-transmitting plate 6 serves as a supporting component for the welding wire 1 to prevent the welding wire 1 from falling from the opening 5. Specifically, the light-transmitting plate 6 can be made of quartz glass. In order to prevent the light-curing adhesive from adhering to the quartz glass, a transparent non-stick layer 7, such as transparent Teflon tape, can be radiated on the upper surface of the quartz glass. Several support beams are provided at the opening 5 to support the quartz glass, such as Figure 5 As shown, the opening 5 can also be a plurality of strip structures corresponding only to the welding wire 1 and the main grid line on the battery cell 2, so as to ensure that the light emitted by the light curing mechanism 23 can pass through the opening 5 and illuminate the welding wire 1 and the main grid line. Figure 3 The frame plate 4 is also provided with a welding wire placement groove 8, the welding wire 1 is located in the welding wire placement groove 8, and the bottom of the welding wire placement groove 8 is provided with a negative pressure adsorption hole 9, as shown. Figure 4 As shown, the negative pressure adsorption hole 9 is connected to the negative pressure adsorption device, and the welding wire placement groove 8 can ensure that the welding wire 1 does not move after being placed to a certain extent. By arranging the negative pressure adsorption hole 9 at the bottom of the groove and arranging the negative pressure adsorption device, the stability of the position of the welding wire 1 can be further ensured.

[0044] Furthermore, in this embodiment, the frame plate 4 is made of metal material, and is provided with a heating element for heating it and a thermocouple 11 for measuring the temperature of the frame plate 4. The heating element can be an electric heating tube 10. By setting the heating element, the frame plate 4 can be heated, thereby increasing the temperature of the welding wire 1 and reducing the internal stress of the welding wire 1.

[0045] like Figures 6 to 8As shown, in this embodiment, the pressing mechanism includes a cylinder 12 and a pressing plate 13. The end of the telescopic rod of the cylinder 12 is floatingly connected to the pressing plate 13. Specifically, the pressing plate 13 is connected to the telescopic rod of the cylinder 12 through a fisheye bearing 14, so that the pressing plate 13 can be twisted around the end of the telescopic rod. When the surface of the battery cell 2 is not completely parallel to the lower surface of the pressing plate 13, the pressing plate 13 can be twisted so that the lower surface of the pressing plate 13 fits the upper surface of the battery cell 2, so that the force on the battery cell 2 is more uniform, which is conducive to ensuring the bonding quality of the main grid line and the welding wire 1. The lower surface of the pressing plate 13 is parallel and spaced apart with a number of pressing bosses 15. A number of glue spots are provided on the upper and lower surfaces of the battery cell 2 corresponding to the main grid line positions, and the glue spots on the upper surface of the battery cell 2 are staggered with the glue spots on the lower surface of the battery cell 2. The pressing bosses 15 are perpendicular to the main grid lines on the lower surface of the battery cell 2 and are arranged corresponding to the glue spots on the lower surface of the battery cell 2. The upper and lower surfaces of the battery cell 2 both have main grid lines, and both need to be connected with the welding wire 1, so the upper and lower surfaces of the battery cell 2 are usually coated with glue at the same time to improve processing efficiency. When the pressing boss 15 is set corresponding to the main grid lines on the lower surface of the battery cell 2, it can avoid the glue spots on the upper surface of the battery cell 2 to avoid squeezing the glue spots on the upper surface of the battery cell 2. The pressing boss 15 is made of a flexible material or a flexible material is pasted on the lower surface of the pressing boss 15 to prevent the battery cell 2 from being impacted during the up and down movement, causing the battery cell to break or crack. After connecting the main grid lines on the lower surface of the battery cell 2 to the welding wire 1, the battery cell 2 is turned over and pressed by other pressing mechanisms so that the main grid lines on the upper surface of the original battery cell 2 are in contact with the welding wire 1, and then cured and bonded. This embodiment focuses on the more difficult connection between the main grid lines on the lower surface of the battery cell 2 and the welding wire 1. The connection between the main grid lines on the upper surface of the battery cell 2 and the welding wire 1 can be cured on other devices, and this embodiment does not limit this.

[0046] Furthermore, in this embodiment, a fixed platform 16 is provided on the pressing mechanism, and a number of adjusting bolts 17 are connected to the fixed platform 16 through threads. The adjusting bolts 17 are arranged perpendicular to the upper surface of the pressing plate 13, and there is a gap between the end of the adjusting bolt 17 and the upper surface of the pressing plate 13. By adjusting the adjusting bolt 17, the size of the gap can be changed, thereby adjusting the torsion range of the pressing plate 13.

[0047] This embodiment also includes a base 18, and a light-curing mechanism 23 is fixed on the base 18. Linear motors 19 are provided on both side surfaces of the base 18. The output end of the linear motor 19 is connected to a slide 20. A lifting mechanism 21 is provided on the slide 20. The lifting mechanism can adopt a lifting cylinder, a screw module, an electric cylinder, a linear motor or other devices that can move with a load; a frame plate 4 is provided at the output end of the lifting mechanism 21. When one frame plate 4 is performing a light-curing connection operation, the other frame plate 4 can perform loading and unloading operations, so that the two frame plates 4 can operate alternately, the overall structure of the fixing device is more compact, and the working efficiency is higher.

[0048] Furthermore, this embodiment also includes a gantry 22, and the pressing mechanism is fixed on the gantry 22. The pressing mechanism is set on both sides of the crossbeam on the gantry 22, and two battery cell 2 placement stations can be set on each frame plate 4 to further improve work efficiency.

[0049] Example 2:

[0050] This embodiment provides a method for fixing welding wires on the surface of a photovoltaic cell, comprising the following steps:

[0051] Turn on the heating element to preheat the light-transmitting plate 6 to the set temperature, and monitor its temperature in real time through the thermocouple 11 to ensure that the light-transmitting plate 6 is always within the set range;

[0052] Place the welding wire 1 on the light-transmitting plate 6 of the frame plate 4, with the end portion located in the welding wire placement slot 8, and fix the welding wire 1 by adsorbing it through the negative pressure adsorption hole 9;

[0053] Apply glue on both sides of the solar panel, with the glue points 3 corresponding to the main grid lines on both sides of the solar panel. Place the solar panel on the light-transmitting plate 6, turn on the heating element, and heat the frame plate 4 to the set temperature.

[0054] The linear motor 19 is activated to move the frame plate 4 to the top of the light curing mechanism 23, and the lifting mechanism 21 is activated to move the frame plate 4 to the set height;

[0055] The cylinder 12 is actuated to press the pressing plate 13 onto the upper surface of the cell 2, causing the welding wire 1 to adhere to the main grid lines on the lower surface of the cell 2, and the light curing mechanism 23 is activated to cure the glue dots 3 on the lower surface of the cell 2;

[0056] The pressing plate 13 is lifted, and the linear motor 19 drives the frame plate 4 to reset. The linear motor 19 on the other side of the base 18 is activated to move the corresponding frame plate 4 to the top of the curing mechanism for operation.

[0057] Adaptive changes based on actual needs are all within the scope of protection of the present invention.

[0058] It should be noted that it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be encompassed within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

Claims

1. A device for fixing welding wire on the surface of a photovoltaic cell, characterized in that: The invention comprises a loading platform, a pressing mechanism and a light-curing mechanism, wherein the loading platform has a light-transmitting area, a plurality of welding wires are placed on the light-transmitting area, a battery cell is arranged above the welding wires, and a light-curing adhesive for bonding the welding wires is coated on the main grid lines on the lower surface of the battery cell, and the main grid lines on the lower surface of the battery cell correspond one-to-one with the welding wires. The pressing mechanism is located above the battery cell and is used to press the upper surface of the battery cell. The light-curing mechanism is located below the light-transmitting area and is used to cure the light-curing adhesive. The loading platform includes a frame plate and a light-transmitting plate, the frame plate is provided with an opening, the light-transmitting plate is fixed at the opening to form the light-transmitting area, the frame plate is further provided with a welding wire placement groove, the welding wire is located in the welding wire placement groove; The pressing mechanism includes a cylinder and a pressing plate, the end of the telescopic rod of the cylinder is floatingly connected to the pressing plate, the lower surface of the pressing plate is parallel and spaced apart with a number of pressing bosses, the upper surface and the lower surface of the battery cell are provided with a number of glue spots corresponding to the main grid line positions, and the glue spot positions on the upper surface of the battery cell are staggered with the glue spot positions on the lower surface of the battery cell, the pressing boss is perpendicular to the main grid line on the lower surface of the battery cell, and corresponds to the glue spot arrangement on the lower surface of the battery cell.

2. The photovoltaic cell surface welding wire fixing device according to claim 1, characterized in that: A negative pressure adsorption hole is provided at the bottom of the welding wire placement groove, and the negative pressure adsorption hole is connected to the negative pressure adsorption equipment.

3. The photovoltaic cell surface welding wire fixing device according to claim 1, characterized in that: A heating element for heating the light-transmitting plate and a thermocouple for measuring the temperature of the light-transmitting plate are arranged inside the frame plate.

4. The photovoltaic cell surface welding wire fixing device according to claim 1, characterized in that: The pressing mechanism is also provided with a fixing platform, on which a plurality of adjusting bolts are connected by threads. The adjusting bolts are arranged perpendicular to the upper surface of the pressing plate, and there is a gap between the ends of the adjusting bolts and the upper surface of the pressing plate.

5. The photovoltaic cell surface welding wire fixing device according to claim 4, characterized in that: It also includes a base, the light curing mechanism is fixed on the base, a linear motor is provided on the base, the output end of the linear motor is connected to a slide, and the frame plate is provided on the slide.

6. The photovoltaic cell surface welding wire fixing device according to claim 5, characterized in that: Two linear motors are provided and are respectively located on two sides of the base. A lifting mechanism is provided on each of the two slides, and the frame plate is provided at the output end of the lifting mechanism.

7. The photovoltaic cell surface welding wire fixing device according to claim 6, characterized in that: It also includes a gantry, and the pressing mechanism is fixed on the gantry.

8. A method for fixing welding wires on the surface of a photovoltaic cell based on the device for fixing welding wires on the surface of a photovoltaic cell according to any one of claims 1 to 7, characterized in that: The following steps are involved: Turn on the heating element to preheat the light-transmitting plate to the set temperature, and monitor its temperature in real time through a thermocouple to ensure that the light-transmitting plate is always within the set range; Place the welding wire on the light-transmitting plate with the end in the welding wire placement slot, and fix the welding wire by adsorbing it through the negative pressure adsorption hole; Apply glue on both sides of the solar panel, with the glue points corresponding to the main grid lines on both sides of the solar panel, and place the solar panel on the light-transmitting board; The linear motor moves the frame plate to the top of the light curing mechanism, and the lifting mechanism moves the frame plate to the set height; The cylinder moves to press the pressing plate onto the upper surface of the cell, the welding wire is attached to the main grid line on the lower surface of the cell, and the light curing mechanism is activated to cure the glue spots on the lower surface of the cell; The pressure plate is lifted, and the linear motor drives the frame plate to reset. The linear motor on the other side of the base is activated to move the corresponding frame plate to the top of the curing mechanism for operation.

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