Laser welding device and junction box welding equipment

Abstract

The utility model discloses a laser welding device and junction box welding equipment, and relates to the technical field of laser welding, the laser welding device comprises a laser generating mechanism and an air blowing mechanism, the laser generating mechanism comprises a laser generator and a field lens connected with the laser generator, and the air blowing mechanism is arranged below the field lens; the blowing mechanism is used for blowing air downwards under the field lens to form conical airflow. The blowing mechanism is arranged below the field lens, so that the blowing mechanism forms conical airflow below the field lens, the conical airflow can effectively prevent splashing objects from splashing to the field lens to pollute the protective lens in the welding process, the service life of the protective lens of the field lens is greatly prolonged, and frequent replacement of the protective lens of the field lens is avoided.

Description

Technical Field

[0001] This application relates to the field of laser welding technology, and particularly relates to a laser welding device and a junction box welding equipment. Background Art

[0002] In the production and manufacturing process of photovoltaic modules, one of the processes is to weld the bus bars on the battery string module to the conductive sheets on the junction box through a laser welding device. However, during the welding process, there are often splashes, and these splashes are likely to splash onto the field lens of the laser welding device, resulting in the need to frequently replace the field lens protection mirror, increasing the production cost. Summary of the Utility Model

[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this reason, this application provides a laser welding device and a junction box welding equipment, which solve the problem that splashes are likely to splash onto the field lens during the welding process in the prior art.

[0004] The object of this application can be achieved by the following technical solutions:

[0005] In the first aspect, this application provides a laser welding device, including a laser generating mechanism and a blowing mechanism. The laser generating mechanism includes a laser generator and a field lens connected to the laser generator. The blowing mechanism is arranged below the field lens, and the blowing mechanism is used to blow downward to form a conical air flow below the field lens.

[0006] This application arranges a blowing mechanism below the field lens, so that the blowing mechanism forms a conical air flow below the field lens. The conical air flow can effectively prevent splashes from splashing onto the field lens during the welding process and polluting its protection mirror, greatly extending the service life of the field lens protection mirror and avoiding the need to frequently replace the field lens protection mirror.

[0007] In an embodiment of the application: there are multiple blowing mechanisms, and the multiple blowing mechanisms are arranged at intervals up and down below the field lens. The multiple blowing mechanisms are used to form multiple layers of conical air flows below the field lens.

[0008] Forming multiple layers of conical air flows through multiple blowing mechanisms arranged at intervals up and down can further increase the resistance to the rising of splashes and improve the effect of preventing splashes.

[0009] In an embodiment of the application: there is an installation frame on one side of the field lens, and the blowing mechanism is installed on the installation frame with adjustable height.

[0010] Through the above setting, the distance between the blowing mechanism and the field lens can be adjusted to adapt to different welding scenarios.

[0011] In an embodiment of the application: The air blowing mechanism includes an upper cover plate and a lower cover plate which are arranged in an upper and lower covering manner. Both the upper cover plate and the lower cover plate are annular. An air flow channel and an air outlet gap which communicate with each other are formed between the upper cover plate and the lower cover plate. The air outlet gap is annular and is located between the inner side of the lower surface of the upper cover plate and the inner side of the upper surface of the lower cover plate. The inner side edge of the lower surface of the upper cover plate extends out of the inner side edge of the upper surface of the lower cover plate. The inner side surface of the lower cover plate is a first conical surface with a gradually decreasing diameter from top to bottom. The air flow in the air flow channel flows out from the air outlet gap and flows downward along the first conical surface to form a conical air flow.

[0012] A specific air blowing mechanism is provided, which blows air through an annular air outlet gap and guides the air through the first conical surface, and finally blows out a conical air flow. The structure is simple and convenient for processing and manufacturing.

[0013] In an embodiment of the application: The inner side surface of the upper cover plate is a second conical surface with the same taper as the inner side surface of the lower cover plate.

[0014] The setting of the second conical surface is beneficial to sucking the gas above the air blowing mechanism downward and forming a conical air flow together with the gas coming out of the air outlet gap.

[0015] In an embodiment of the application: The first conical surface and the second conical surface are conical surfaces or pyramidal surfaces.

[0016] Through the above setting, the air blowing mechanism forms a conical air flow or a pyramidal air flow.

[0017] In an embodiment of the application: A guiding arc is provided between the upper surface of the lower cover plate and the inner side surface of the lower cover plate.

[0018] The setting of the guiding arc enables the air flow to be guided by the guiding arc to the first conical surface after flowing out of the air outlet gap and flow downward along the first conical surface.

[0019] In an embodiment of the application: The height of the air outlet gap is 10 microns to 100 microns.

[0020] Setting the height of the air outlet gap to 10 microns to 100 microns can ensure the controllability of the air outlet intensity and the wind direction, and further ensure the blocking effect on the splashes.

[0021] In an embodiment of the application: The angle between the first conical surface and the axis of the lower cover plate is 10° to 80°.

[0022] By setting the angle between the first conical surface and the axis of the lower cover plate to 10° to 80°, it can ensure the effective downward guiding of the air coming out of the air outlet gap and form an effective conical air flow.

[0023] In an embodiment of the application: An annular groove is formed on the upper surface of the lower cover plate, and an air flow channel is formed between the annular groove and the lower surface of the upper cover plate.

[0024] With the above settings, the air flow channel is continuously connected circumferentially along the lower cover plate with the air outlet gap, making the air outlet of the air outlet gap more uniform along the circumferential direction of the lower cover plate.

[0025] In an embodiment of the application: an air inlet hole communicating with the air flow channel and used for docking an external air source is opened on the lower cover plate, and at least one air inlet hole is arranged along the circumferential direction of the lower cover plate; when a plurality of air inlet holes are arranged, the plurality of air inlet holes are evenly distributed along the circumferential direction of the lower cover plate.

[0026] The uniform distribution of the air inlet holes can improve the uniformity of air intake in the air flow channel and further improve the uniformity of air outlet along the circumferential direction of the lower cover plate.

[0027] In an embodiment of the application: the air blowing mechanism is an annular air knife, and the annular air knife includes an annular air outlet and a conical guiding surface located below the annular air outlet.

[0028] By using the annular air knife with a conical guiding surface, a downward conical air flow can be formed below the field lens to hinder splashes.

[0029] In a second aspect, the present application provides a junction box welding device, including the laser welding device according to any one of the above.

[0030] When using the junction box welding device provided by the present application to weld the junction box and the bus bar on the photovoltaic module, the air blowing mechanism can form a conical air flow below the field lens, and the conical air flow can effectively hinder the splashes during the welding process from splashing onto the field lens and contaminating its protective lens, greatly extending the service life of the protective lens of the field lens and avoiding the need to frequently replace the protective lens of the field lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The following further describes the present application with reference to the drawings.

[0032] Figure 1 is a schematic structural diagram of the laser welding device in an embodiment of the present application;

[0033] Figure 2 is a schematic structural diagram of the air blowing mechanism in an embodiment of the present application;

[0034] Figure 3 is a schematic cross-sectional structural diagram of the air blowing mechanism in an embodiment of the present application;

[0035] Figure 4 is Figure 3 a partially enlarged view of the local structure in

[0036] Description of the reference numerals:

[0037] 1. Laser generating mechanism; 11. Field lens; 12. Laser generator; 13. Bracket; 14. Galvo scanner; 2. Air blowing mechanism; 21. Upper cover plate; 211. Inner edge of the lower surface of the upper cover plate; 22. Lower cover plate; 221. Inner edge of the upper surface of the lower cover plate; 23. Air flow channel; 24. Air outlet gap; 25. First conical surface; 26. Air inlet hole; 27. Guide arc; 28. Second conical surface; 3. Conical air flow; 4. Mounting bracket; 100. Laser welding device. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0039] As described in the background art, during the production and manufacturing process of current photovoltaic modules, the busbars on the battery string assembly are welded to the conductive sheets on the junction box through a laser welding device. However, during the welding process, there are often splashes, and these splashes are likely to splash onto the field lens of the laser welding device, resulting in the need to frequently replace the field lens protection mirror, increasing the production cost. Therefore, there is an urgent need for a laser welding device that can prevent splashes from splashing onto the field lens of the laser welding device.

[0040] It can be understood that the laser welding device in the present application is not only applicable to the welding scenario of photovoltaic modules, but can also be used in other laser welding scenarios with welding splashes.

[0041] The present application will be specifically elaborated through specific embodiments below.

[0042] Please refer to Figure 1 As shown, the present application provides a laser welding device 100, which includes a laser generating mechanism 1 and an air blowing mechanism 2. The laser generating mechanism 1 includes a laser generator 12 and a field lens 11 connected to the laser generator 12. The air blowing mechanism 2 is disposed below the field lens 11. The air blowing mechanism 2 is used to blow air downward below the field lens 11 to form a conical air flow 3 (as Figure 1 shown by the dotted line). The conical air flow 3 can effectively prevent splashes from splashing onto the field lens 11 during the welding process and contaminating its protection mirror, greatly extending the service life of the protection mirror of the field lens 11 and avoiding the need to frequently replace the protection mirror of the field lens 11.

[0043] It should be noted that this application does not impose excessive restrictions on the specific structure of the laser generating mechanism 1. In practical applications, those skilled in the art can set the specific structure of the laser generating mechanism 1 according to actual needs. For example, the laser generating mechanism 1 includes a laser generator 12, a bracket 13, a galvanometer 14, and a field lens 11. The laser generator 12 and the galvanometer 14 are both fixedly installed on the bracket 13. The field lens 11 is installed at the bottom of the galvanometer 14. The laser beam emitted by the laser generator 12 irradiates onto the object to be welded after passing through the galvanometer 14 and the field lens 11 in sequence. The galvanometer 14 can control the path of the laser beam and the size of the light spot to ensure the quality of the laser output.

[0044] In one embodiment, there are multiple air blowing mechanisms 2. The multiple air blowing mechanisms 2 are arranged at intervals along the axial direction of the field lens 11 below the field lens 11. The multiple air blowing mechanisms 2 can form multiple layers of conical airflows 3 that are superimposed on each other below the field lens 11 to enhance the effect of preventing spatter. Among them, the distance between the multiple air blowing mechanisms 2 is specifically set according to actual applications.

[0045] In one embodiment, an installation frame 4 is provided on one side of the field lens 11. The installation frame 4 can be fixedly installed on the bracket 13 of the laser generating mechanism 1. The air blowing mechanism 2 is installed on the installation frame 4 with adjustable height, which is convenient for the staff to adjust the distance between the air blowing mechanism 2 and the field lens 11, thereby adapting to different welding scenarios. In practical applications, the installation method of the air blowing mechanism 2 with adjustable height on the installation frame 4 can be selected according to the existing technology. For example, the installation frame 4 is provided with a waist-shaped hole (not shown) opened in the vertical direction. The air blowing mechanism 2 can cooperate with the waist-shaped hole and be fixedly installed on the installation frame 4 through bolts. When the bolts are loosened, the air blowing mechanism 2 can move up and down along the length direction of the waist-shaped hole, thereby realizing the adjustment of the distance between the air blowing mechanism 2 and the field lens 11.

[0046] Please refer to Figures 2 - 4 As shown, in one embodiment, the air blowing mechanism 2 includes an upper cover plate 21 and a lower cover plate 22 that are arranged in an upper and lower covering manner. Both the upper cover plate 21 and the lower cover plate 22 are annular. An air flow channel 23 and an air outlet gap 24 that communicate with each other are formed between the upper cover plate 21 and the lower cover plate 22. The air outlet gap 24 is annular and is located between the inner side of the lower surface of the upper cover plate 21 and the inner side of the upper surface of the lower cover plate 22. The inner edge 211 of the lower surface of the upper cover plate 21 extends beyond the inner edge 221 of the upper surface of the lower cover plate 22. The inner side surface of the lower cover plate 22 is a first conical surface 25 with a gradually decreasing diameter from top to bottom. The air flow in the air flow channel 23 can flow out from the air outlet gap 24, and under the blocking of the part where the inner edge of the lower surface of the upper cover plate 21 extends beyond the inner edge of the upper surface of the lower cover plate 22, the air flow flows downward along the first conical surface 25 to form a conical air flow 3.

[0047] In one embodiment, the height of the air outlet gap 24 is 10 micrometers to 100 micrometers, which can ensure controllable air outlet intensity and air direction, and further ensure the blocking effect on splashes. Optionally, the height of the air outlet gap 24 is 10 micrometers, 20 micrometers, 30 micrometers, 40 micrometers, 50 micrometers, 60 micrometers, 70 micrometers, 80 micrometers, 90 micrometers or 100 micrometers. The smaller the air outlet gap, the higher the air outlet intensity.

[0048] In one embodiment, the angle between the first conical surface 25 and the axial direction of the lower cover plate 22 is 10° to 80°, which can ensure effective downward guidance of the air coming out of the air outlet gap 24 and form an effective conical air flow 3. Optionally, the angle between the first conical surface 25 and the axial direction of the lower cover plate 22 is 10°, 20°, 30°, 45°, 60°, 70° or 80°.

[0049] In one embodiment, to make the air outlet of the air outlet gap 24 uniform in the circumferential direction of the lower cover plate 22, both the air flow channel 23 and the air outlet gap 24 are set as closed-loop structures, and the air flow channel 23 is arranged around the periphery of the air outlet gap 24. Among them, the air flow channel 23 is formed by an annular groove opened on the upper surface of the lower cover plate 22 and the lower surface of the upper cover plate 21 covering above the annular groove. The air flow channel 23 is radially communicated with the air outlet gap 24 along the radial direction of the lower cover plate 22, and the communication between the air flow channel 23 and the air outlet gap 24 is continuous along the circumferential direction of the lower cover plate 22. An air inlet hole 26 communicated with the air flow channel 23 and used for docking an external air source is opened on the lower cover plate 22, and at least one air inlet hole 26 is arranged along the circumferential direction of the lower cover plate 22. When there are multiple air inlet holes 26, the multiple air inlet holes 26 are evenly distributed along the circumferential direction of the lower cover plate 22.

[0050] In one embodiment, the upper surface of the lower cover plate 22 and the inner side surface of the lower cover plate 22 are in arc transition, so that a guiding arc 27 is formed between the upper surface of the lower cover plate 22 and the inner side surface of the lower cover plate 22. Further, after the air flows out from the air outlet gap 24, it can be guided by the guiding arc 27 to the first conical surface 25 and flow downward along the first conical surface 25, improving the condensation degree of the conical air flow 3 and enhancing the interception effect of the conical air flow 3.

[0051] In one embodiment, the inner side surface of the upper cover plate 21 is a second conical surface 28 with the same taper as the inner side surface of the lower cover plate 22. When the air is blown through the air outlet gap 24, the second conical surface 28 can guide the air flow above the blowing mechanism 2 downward and suck it in, and together with the gas coming out of the air outlet gap 24, form a conical air flow 3, further increasing the intensity of the conical air flow 3 formed by the blowing mechanism 2.

[0052] In one embodiment, the first conical surface 25 and the second conical surface 28 are conical surfaces or pyramidal surfaces, so that the conical air flow 3 formed by the blowing mechanism 2 is a conical air flow 3 or a pyramidal air flow 3.

[0053] In one embodiment, for the convenience of manufacturing the air blowing mechanism 2, the upper cover plate 21 and the lower cover plate 22 are detachably connected. Specifically, the upper cover plate 21 and the lower cover plate 22 can be connected by bolts, which is convenient for the assembly between the upper cover plate 21 and the lower cover plate 22.

[0054] In one embodiment, the air blowing mechanism 2 is an annular air knife. The annular air knife includes an annular air outlet and a conical guiding surface located below the annular air outlet. The annular air knife blows air through the annular air outlet towards the conical guiding surface, so that the air flow flows downward along the conical guiding surface, and then a downward conical air flow 3 is formed below the field lens 11 to hinder the splashes.

[0055] The present application also provides a junction box welding device. The junction box welding device is used to weld the bus bar on the battery string assembly to the conductive sheet in the junction box, and the junction box is fixed on the battery string assembly; the junction box welding device includes a conveying device (not shown), a bus bar pressing device (not shown) and the above-mentioned laser welding device 100, wherein:

[0056] The conveying device is configured to convey the battery string assembly along the first horizontal direction to send the junction box to the welding station;

[0057] The bus bar pressing device is arranged above the welding station and is configured to press the bus bar on the corresponding conductive sheet;

[0058] The laser welding device 100 is arranged above the welding station and is configured to weld the pressed bus bar to the corresponding conductive sheet.

[0059] Among them, the battery string assembly includes a back plate, an upper glue film, a battery string group, a lower glue film and a front plate which are arranged in sequence from top to bottom. The junction box is fixed on the back plate, and the bus bar led out from the battery string group penetrates into the junction box. Through the junction box welding device provided by the embodiment of the present application, the bus bar can be welded and connected to the conductive sheet in the junction box, and during the welding process, the splashes are effectively hindered from splashing onto the field lens 11 to contaminate the field lens protective mirror, greatly prolonging the service life of the field lens protective mirror and avoiding the need to frequently replace the field lens protective mirror.

[0060] The above has described a detailed description of an embodiment of the present application, but the above content is only a preferred embodiment of the present application and cannot be considered as limiting the scope of implementation of the present application. All equivalent changes and improvements made according to the scope of the present application shall still fall within the scope covered by the patent of the present application.

[0061] It should be noted that the "first", "second" and similar terms used in this application do not denote any order, quantity or importance, but are only used to distinguish different components. The descriptions of directions such as "left", "right", "left side", "right side", "upper part", "lower part", "top", "bottom" in this application are all defined based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the described structure must be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application. In the description of this application, "a plurality of" means more than two, unless otherwise specifically defined.

[0062] In the description of this application, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

Claims

1. A laser welding device, characterized in that: It comprises a laser generating mechanism and an air blowing mechanism. The laser generating mechanism comprises a laser generator and a field lens connected to the laser generator. The air blowing mechanism is arranged below the field lens and is used for blowing air downwards below the field lens to form a conical airflow.

2. A laser welding device according to claim 1, characterized in that: There are multiple air blowing mechanisms, and the multiple air blowing mechanisms are arranged below the field lens at intervals in the upper and lower parts. The multiple air blowing mechanisms are used to form multiple layers of the conical airflow below the field lens.

3. A laser welding device according to claim 1, characterized in that: A mounting frame is provided on one side of the field mirror, and the blowing mechanism is mounted on the mounting frame in an adjustable height.

4. A laser welding device according to any one of claims 1 to 3, characterized in that: The blowing mechanism includes an upper cover plate and a lower cover plate which are arranged in an upper and lower covering manner, and the upper cover plate and the lower cover plate are both annular, and an air flow channel and an air outlet gap which are interconnected are formed between the upper cover plate and the lower cover plate, and the air outlet gap is annular and is located between the inner side of the lower surface of the upper cover plate and the inner side of the upper surface of the lower cover plate, and the inner edge of the lower surface of the upper cover plate extends out of the inner edge of the upper surface of the lower cover plate, and the inner surface of the lower cover plate is a first conical surface with a gradually decreasing diameter from top to bottom, and the air flow in the air flow channel flows out from the air outlet gap and flows downward along the first conical surface to form the conical airflow.

5. A laser welding device according to claim 4, characterized in that: The inner side surface of the upper cover plate is a second conical surface with the same taper as that of the inner side surface of the lower cover plate.

6. A laser welding device according to claim 5, characterized in that: The first tapered surface and the second tapered surface are conical surfaces or pyramidal surfaces.

7. A laser welding device according to claim 4, characterized in that: A guide arc is provided between the upper surface of the lower cover plate and the inner side surface of the lower cover plate.

8. A laser welding device according to claim 4, characterized in that: The height of the air outlet gap is 10 micrometers to 100 micrometers.

9. The laser welding device according to claim 4, characterized in that: The included angle between the first conical surface and the axial direction of the lower cover plate is 10° to 80°.

10. The laser welding device according to claim 4, characterized in that: The upper surface of the lower cover plate is provided with an annular groove, and the air flow channel is formed between the annular groove and the lower surface of the upper cover plate.

11. A laser welding device according to claim 10, characterized in that: The lower cover plate is provided with an air inlet hole which is connected with the air flow channel and is used for connecting with an external air source. At least one air inlet hole is arranged along the circumference of the lower cover plate. When there are multiple air inlet holes, the multiple air inlet holes are evenly distributed along the circumference of the lower cover plate.

12. A laser welding device according to any one of claims 1 to 3, characterized in that: The air blowing mechanism is an annular air knife, which includes an annular air outlet and a conical guide surface located below the annular air outlet.

13. A junction box welding device, characterized in that: It comprises a laser welding device as described in any one of claims 1 to 12.

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