Welding module for solar cell string welding machine

Abstract

The utility model discloses a welding module for a solar cell string welding machine, which comprises a light source, the front surface of the light source is provided with a light gathering device which gathers light rays into array light spots or regularly distributed linear light spots, and the width or diameter of the light spots is not less than 0.5 mm. According to the utility model, the light spots which are large enough are formed, so that the light rays can be uniformly distributed; and the welding strip / main grid and auxiliary grid overlapping part is covered once, heating welding is carried out, and meanwhile accurate and uniform welding is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of welding devices, especially a kind of welding module for solar cell string welding machine. BACKGROUND

[0002] In the production process of solar cell module, cell string welding is the core process, generally adopts the way of hot-press welding to weld. The full-automatic stringer on the market generally adopts hot-pressing load tool to fix the welding strip and the cell.

[0003] For example, Figure 1 The infrared welding method is one of the most mature welding methods for heating the cell string, but it has the problem that infrared heating will heat the entire cell area, and a large amount of heat will heat the parts of the cell that do not need to be welded, resulting in a large amount of heat waste. In addition, after the whole cell is heated, the cell will produce severe bending deformation due to the temperature difference after welding, especially for single-sided cells. These bending deformations will cause the cell to crack and break in the subsequent production, and will also increase the difficulty of cell layout positioning, resulting in inaccurate cell positioning, which seriously affects the appearance of the module product and reduces the product yield. The utility model patent with publication number CN 219616884 U discloses a string welding device and a string welding machine, which heats each welding strip locally by laser to weld the welding strip with multiple cells, effectively avoiding the virtual welding, overwelding and bending of the cells caused by large-area heating, but the laser is point-shaped heating, and the overlapping part between the welding strip and the grid line is long strip-shaped, so the multi-point and multi-time welding method cannot guarantee uniform welding.

[0004] In addition, the infrared welding module of the current stringer can only be used for cell string hot welding process, and is completely unsuitable for 0BB cell adhesion and UV curing process. UTILITY MODEL CONTENT

[0005] The utility model aims to provide a solar cell string welding machine welding module that can achieve precise and uniform welding.

[0006] Technical scheme: The solar cell string welding machine welding module of the utility model comprises a light source, the front of the light source is provided with a light collecting device that can concentrate light into an array spot or a regularly distributed linear spot, and the width or diameter of the spot is not less than 0.5 mm.

[0007] Preferably, the light source is one of an array of single LED lamp beads or an array of LED lamp bead groups, and the array is a triangular, quadrilateral or polygonal array. The LED lamp beads are arranged in a preset rule to form an array to form a regularly distributed light spot, and the density and intensity of the array light spot can be adjusted by adjusting the parameters of the array, such as the number of lamp beads, the number of array rows, the point spacing, the row spacing, etc.

[0008] Preferably, the wavelength of the light source is 200 nm to 30 μm.

[0009] Preferably, the light collecting device is a one-piece structure or a combined structure, and the light collecting device is formed by a positive lens or a combination of a positive lens and a reverse light collecting mechanism.

[0010] Preferably, the positive lens is an optical device or a group of optical devices with a local light collecting structure, and the lens is an optical element made of a transparent material, such as glass, quartz, crystal and resin, with a refractive index ranging from 1.4 to 2.0.

[0011] Preferably, the positive lens is a multi-focal lens of different regions, or is arranged and combined by a plurality of single-point focal lenses or single-line focal lenses, and the focal point position of the positive lens corresponds to the position of the LED lamp bead.

[0012] Preferably, the lens surface has at least one of an anti-reflection film, a scratch-resistant film and a light filtering film.

[0013] Preferably, the light collecting device has a positioning mechanism for supporting and adjusting the distance and angle of the light collecting device relative to the light source, and the positioning mechanism is a moving pair. The position and angle of the positioning mechanism are accurately set to achieve a predetermined arrangement of the light collecting device, and the diameter of the dot-shaped light spot and the width of the existing light spot are adjusted by adjusting the position, angle and distance of the positioning mechanism relative to the light source. The moving pair is a sliding guide type moving pair, such as a sliding block and rail, or a roller guide type moving pair, to adjust the distance of the light collecting device relative to the light source, and the rotating pair has a rotating shaft to adjust the angle of the light collecting device relative to the light source.

[0014] Preferably, the light collecting device further comprises a self-locking mechanism for fixing the relative position and angle of the light collecting device and the light source, and the self-locking mechanism is connected with the positioning mechanism. The self-locking mechanism is a mechanical self-locking mechanism or an electromagnetic self-locking mechanism, and the mechanical self-locking mechanism is a bolt or a cam, and the electromagnetic self-locking mechanism is an electromagnet.

[0015] Preferably, in order to optimize the formation effect of the light spot, the reverse light collecting mechanism comprises one or more reflection structures for deflecting the direction of the light rays emitted by the light source towards the battery string, and the reflection structures are arranged in the light path of the light collecting device. The reflectivity of the reverse light collecting mechanism is not less than 90%.

[0016] Preferably, the reverse light condensing mechanism is an integral structure or a combined structure formed by one or more grooves. When the reverse light condensing mechanism is an integral structure, it is formed by stamping a piece of sheet metal. When the reverse light condensing mechanism is a combined structure, the combination manner is not limited by the arrangement manner of the light source and the forward lens.

[0017] Preferably, the top of the light source is connected with a control module or a control module group, and each control module controls one or more LED lamp beads or LED lamp bead groups to adjust the working parameters of each LED lamp bead or LED lamp bead group.

[0018] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1, accurate welding and uniform welding: by forming a large enough light spot, covering the overlapping part of the solder strip / main grid and the auxiliary grid at one time, heating and welding, while realizing accurate and uniform welding; 2, improve fault tolerance, reduce processing difficulty, and adjust the size of the light spot: compared with laser point welding, the scheme adopts a light spot, which reduces the equipment precision requirement; 3, improve energy utilization: form a strip-shaped light source, and the strip-shaped light source is used to cover the rectangular overlapping area formed by the solder strip and the grid line; 4, effectively avoid bending deformation; 5, change the wavelength of the light source, suitable for 0BB battery adhesive UV curing process battery string production. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a front view of the welding assembly structure in the prior art;

[0020] Figure 2 It is a front view of the welding assembly structure of the first embodiment of the utility model without a positioning mechanism;

[0021] Figure 3 It is a front view of the welding module structure of the first embodiment of the utility model;

[0022] Figure 4 It is a front view of the welding assembly structure of the first embodiment of the utility model;

[0023] Figure 5 It is a top view of the welding assembly structure of the first embodiment of the utility model;

[0024] Figure 6 It is a top view of the light source structure of the first embodiment of the utility model;

[0025] Figure 7 It is a schematic diagram of the principle of welding the battery main grid and the grid line by using the welding assembly of the first embodiment;

[0026] Figure 8 It is a front view of the welding module structure of the third embodiment of the utility model;

[0027] Figure 9 It is the reverse light gathering mechanism structure schematic view of the first embodiment of the utility model;

[0028] Figure 10 It is the reverse light gathering mechanism structure schematic view of the second embodiment of the utility model;

[0029] Figure 11 It is the reverse light gathering mechanism structure side view of the fourth embodiment of the utility model. DETAILED DESCRIPTION

[0030] The technical scheme of the utility model will be further explained below with reference to the drawings.

[0031] Embodiment 1: as Figures 2 to 4 The welding assembly is composed of a plurality of welding modules, and the plurality of welding modules are integrated in a rectangular array on the substrate 7, so as to be conveniently moved to a target welding position. Figure 7 When in use, the light spot formed by the welding module is adjusted to be aligned with and cover the welding area 12 (the selected frame part in the drawing) of the battery 1, the power and time are set by the adjustment control module 6, and then the welding area can be welded.

[0032] The welding module corresponds to the position to be welded of the solar cell 1, the welding points of the existing solar cell 1 standard part are distributed in a rectangular array, and therefore the welding module is distributed in a rectangular array, and the welding module arrangement can also have other modes.

[0033] As Figure 3 The welding module is mainly composed of a light source 2 and a light gathering device 4, the light gathering device 4 is located in front of the light source 2, and is used to gather the light emitted by the light source 2 to form an array type light spot or a regularly distributed linear light spot, so as to concentrate heat, the light spot is used to heat the overlapping part of the solder strip / main grid 11 and the grid line, in order to ensure uniform welding, the size of the formed light spot needs to be greater than the overlapping part of the solder strip and the grid line, if the circular light spot formed by the combination of the light source 2 and the light gathering device 4 is a circular light spot, the diameter is not less than 0.5 mm.

[0034] As Figure 6 The light source 2 is one of an array formed by a single LED lamp bead or an array formed by a LED lamp bead group, and the array can be a triangular array, a quadrilateral array or a polygonal array. On the mounting plate 8, a plurality of LED lamp beads are arranged in a preset rule to form an array, so as to cooperate with the light gathering device 4 to form a regularly distributed light spot. When designing, the density and intensity of the formed light spot can be adjusted by adjusting the number of lamp beads in the array, the number of rows in the array, the point spacing and the row spacing.

[0035] Light source 2 can be infrared or ultraviolet, or a combination of infrared and ultraviolet. Depending on the battery string connection process, whether hot-melt or light-curing, the wavelength of light source 2 is between 200 nm and 30 μm. The operator can select the light source or wavelength range as needed. When light source 2 is infrared, it can be formed by an electric heating device or an array of LED lamp beads.

[0036] A control module 6 is connected to the top of the light source 2 to adjust the heating time and power of the light source 2. The control module is existing technology and will not be described in detail. Each LED lamp can be controlled independently or simultaneously, and the appropriate wavelength LED lamp bead can be selected according to the heating welding or UV curing requirements.

[0037] The focusing device 4 is an integrated structure or a combined structure. The focusing device 4 is formed by a forward lens, or a combination of a forward lens and a reverse focusing mechanism. The forward lens is an optical device or an optical device group with a local focusing structure. The lens is an optical element made of a transparent material. The transparent material is one of glass, quartz, crystal and resin, and the refractive index range is 1.4 to 2.0; the lens surface has at least one of an anti-reflection film, an anti-scratch film, and a filter film. The reverse focusing mechanism includes one or more reflective structures for deflecting the direction of light from the light source toward the battery string. The reflective structure is arranged in the light path of the focusing device, and the reflectivity of the reverse focusing mechanism is not less than 90%. The light source 2 and the focusing device 4 are combined to form a light spot. In order to further increase the energy utilization rate and optimize the formation effect of the light spot, a reverse focusing mechanism 3 is provided on the back of the light source 2 to reflect the light from the back and surrounding areas of the light source 2 to the front of the light source, so that the scattered light around the light source 2 is turned and concentrated to the front, making full use of the energy. The reverse focusing mechanism 3 can be a flat reflector, a box-shaped structure formed by splicing reflectors, or an umbrella-shaped, hemispherical, cup-shaped or other curved surface structure. Specifically, Figure 9 As shown, it is a schematic diagram of the reverse focusing mechanism structure of this embodiment, wherein a plurality of cup-shaped reflective covers are arranged in a certain pattern, and the light source 2 is located inside the reflective cover. Accordingly, the focusing device 4 is located near the exit of the cup-shaped reflective cover and is a circular convex lens. The reflective cover and the reflective cover bracket are fixedly connected, or can be detachably connected, or can be an integrated structure, which is formed by stamping a piece of sheet metal.

[0038] The light source 2 and the focusing device 4 can be directly connected or connected through a positioning mechanism 5. The positioning mechanism 5 is used to adjust the distance between the light source 2 and the focusing device 4, and the relative angle between the focusing device 4 and the light source 2, so as to fine-tune the size of the light spot formed according to the working conditions. The positioning mechanism 5 can be an automatic positioning mechanism or a manual positioning mechanism 5. When the positioning mechanism 5 is a manual positioning mechanism, the structure can be that the lens moves relative to the light source. For example, a moving pair is installed between the focusing device 4 and the light source 2. The moving pair is a sliding guide type moving pair, such as a slider slide, or a roller guide type moving pair. Specifically, there is a bracket on the periphery of the focusing device 4, and a nut is fixed on the bracket. The mounting bracket of the light source 2 is connected to a threaded rod by rotating around it. The lens is connected to the light source through the nut and the threaded rod. The threaded rod is rotated to adjust the distance between the two, thereby adjusting the size of the light spot 9. The light source can also move relative to the lens. The connection method can be the opposite of the above. The positioning mechanism also includes a rotating pair. The rotating pair has a rotating shaft for adjusting the angle of the focusing device relative to the light source. When the moving pair is a sliding guide type moving pair, the positioning mechanism is connected to a self-locking mechanism, which is a mechanical self-locking mechanism or an electromagnetic self-locking mechanism. The mechanical self-locking mechanism is a bolt or a cam, and the electromagnetic self-locking mechanism is an electromagnet, so that the relative position and angle of the focusing device and the light source are fixed.

[0039] Example 2: Based on Example 1, this example can also be modified as follows: the light source 2 is formed by LED lamp beads arranged to form a strip or rectangular light source, and the reverse focusing mechanism 3 is semi-cylindrical. Specifically, Figure 10 As shown, several trough-shaped / semi-cylindrical reflectors are arranged in a regular pattern. Light source 2 is located within the reflectors, reflecting light from the back of light source 2 to the front, forming a light strip. A cylindrical concentrator 4 is located near the exit of the trough-shaped / semi-cylindrical reflector. Concentrator 4 is used to narrow the light strip formed by the reverse concentrating mechanism 3 and the light source, resulting in a strip-shaped light spot 9. Compared to a circular light spot, a strip-shaped light spot has a smaller width and area, and the overlapping portion of the solder strip and grid lines more efficiently utilizes the heat generated by the light spot. In this case, the width of the strip-shaped light spot is no less than 0.5 mm.

[0040] Example 3: Based on Example 1 or 2, this example can also have the following variations:

[0041] If the distance between the solar cell 1 and the concentrator 4 is less than the focal length of the concentrator 4, the expected size of the light spot cannot be obtained. In the case of a single lens, if the distance between the solar cell 1 and the lens is large, the volume of the welding module will increase, and the energy loss will also increase. If the focal length of the lens is reduced, the volume of the lens itself will become larger. Therefore, if Figure 8 The focusing device 4 is a lens group formed by arranging more than two lenses to reduce the volume of the welding module.

[0042] Embodiment 4: On the basis of Embodiment 1, this embodiment can also have the following variations: as Figure 11 The positive lens is a multi-focal type lens, or is composed of a plurality of single-point focal type lenses or single-line focal type lenses.

Claims

1. A welding module for a solar cell string welding machine, comprising a light source (2), characterized in that: The front of the light source (2) is provided with a focusing device (4) for focusing light into an array of light spots or regularly distributed linear light spots, and the width or diameter of the light spots is not less than 0.5 mm.

2. The welding module for a solar cell string welding machine according to claim 1, characterized in that: The light source (2) is an array formed by a single LED lamp bead or an array formed by a group of LED lamp beads, and the array is a triangular, quadrilateral or polygonal array.

3. The welding module for a solar cell string welding machine according to claim 1 or 2, characterized in that: The wavelength of the light source (2) is 200 nm to 30 μm.

4. The welding module for a solar cell string welding machine according to claim 1, characterized in that: The light focusing device is an integrated structure or a combined structure, formed by a forward lens, or a forward lens and a reverse light focusing mechanism.

5. The welding module for a solar cell string welding machine according to claim 4, characterized in that: The positive lens is an optical device or an optical device group with a local focusing structure. The positive lens is made of a transparent material, which is one of glass, quartz, crystal and resin, and has a refractive index range of 1.4 to 2.

0.

6. The welding module for a solar cell string welding machine according to claim 4, characterized in that: The forward lens is a regional multi-focus lens, or is composed of a plurality of single-point focus lenses or single-line focus lenses arranged and combined. The focus position of the forward lens corresponds to the position of the LED lamp bead.

7. The welding module for a solar cell string welding machine according to claim 5, characterized in that: The surface of the positive lens has at least one of an anti-reflection film, an anti-scratch film, and a filter film.

8. The welding module for a solar cell string welding machine according to claim 4, characterized in that: The light concentrating device (4) has a positioning mechanism for supporting and adjusting the distance and angle of the light concentrating device relative to the light source, and the positioning mechanism is a moving pair and / or a rotating pair.

9. The welding module for a solar cell string welding machine according to claim 8, characterized in that: The light concentrating device also has a self-locking mechanism for fixing the relative position and angle between the light concentrating device (4) and the light source, and the self-locking mechanism is connected to the positioning mechanism.

10. The welding module for a solar cell string welding machine according to claim 4, characterized in that: The reverse focusing mechanism includes one or more reflective structures for deflecting the direction of light from the light source. The reflective structure is arranged in the light path of the focusing device. The reflectivity of the reverse focusing mechanism is not less than 90%.

11. The welding module for a solar cell string welding machine according to claim 4, characterized in that: The reverse focusing mechanism is an integrated structure or a combined structure, formed by combining one or more grooves.

12. The welding module for a solar cell string welding machine according to claim 1, characterized in that: A control module or a control module group is connected to the top of the light source, and each control module controls one or more LED lamp beads or LED lamp bead groups.

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