Photovoltaic module production method, apparatus and photovoltaic module

Abstract

The application discloses a photovoltaic module preparation method, equipment and photovoltaic module. The photovoltaic module preparation method comprises the following steps: dispensing glue on a cell to form a glue point; arranging a plurality of cells into a cell group corresponding to one photovoltaic module; placing a first interconnecting piece; placing a bus assembly; and welding the cells and the first interconnecting piece and the second interconnecting piece by laser, wherein the laser avoids the bus assembly during the welding process. In the embodiment of the application, the risk of edge crack and broken piece of the cell at the overlapping position of the bus assembly and the cell can be reduced.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic technology, and in particular to a method, equipment and photovoltaic module manufacturing process. Background Technology

[0002] Back-contact photovoltaic modules include multiple cell strings and busbars that connect the multiple cell strings in series and parallel. Each cell string includes multiple cells and solder strips that connect the multiple cells in series. The cells and solder strips are electrically connected by traditional welding processes, such as infrared welding. However, traditional welding processes increase the risk of cell warping and microcracks.

[0003] In addition, with a fixed photovoltaic module size, hiding the busbars can increase the effective utilization area of ​​the module. However, when the busbars are hidden, they overlap with the solar cells, increasing the risk of microcracks and cell breakage at the cell edges. Summary of the Invention

[0004] This invention provides a method, equipment, and photovoltaic module manufacturing process, aiming to reduce the risk of microcracks and cell cracks in solar cells.

[0005] This invention provides a method for manufacturing photovoltaic modules, comprising: Apply adhesive to the solar cells to form adhesive dots; The multiple solar cells are arranged into a solar cell pack corresponding to a photovoltaic module; Place the first interconnecting component; wherein the first interconnecting component is used to electrically connect two adjacent battery cells, and the adhesive dots include first adhesive dots for pre-fixing the first interconnecting component; A current-carrying assembly is placed, wherein the current-carrying assembly includes a current-carrying component and a second interconnecting component connected as one unit, the first interconnecting component and the second interconnecting component both extending along a first direction, the current-carrying component overlapping with an adjacent battery cell, and the current-carrying component overlapping with an adjacent first interconnecting component and a first adhesive dot; The battery cell, the first interconnect, and the second interconnect are welded together using a laser, wherein the laser avoids the busbar during the welding process.

[0006] In this embodiment of the invention, the busbar and the second interconnect are pre-connected as a single unit to form a busbar assembly. During the laser welding process between the battery cell and the first and second interconnects, the laser does not pass through the busbar. This avoids the increased risk of microcracks and cracks at the battery cell edge due to the overlap between the busbar and the battery cell caused by the laser passing through the busbar, thereby reducing the risk of microcracks and cracks at the battery cell edge and improving the process yield. Furthermore, for the portion of the first interconnect extending between the busbar and the battery cell, there are first adhesive dots between the first interconnect and the busbar. These first adhesive dots act as a buffer, effectively reducing the stress impact on the battery cell edge caused by this portion of the first interconnect extending between the busbar and the battery cell during the lamination process, thereby reducing the risk of microcracks and cracks at the battery cell edge and improving the process yield.

[0007] Optionally, the laser welding of the battery cell to the first interconnect and the second interconnect includes: The solar cell, the first interconnect, and the second interconnect are welded together using a laser emitted by a laser welding device. During the welding process, the laser welding device moves along the first direction and emits a laser. During the welding process, the travel path of the laser welding device is controlled so that the travel path of the laser welding device avoids the busbar, thereby causing the laser to avoid the busbar; and / or, during the welding process, the laser emission time is controlled so that when the laser welding device travels above the busbar, the laser welding device does not emit laser light, thereby causing the laser to avoid the busbar.

[0008] Optionally, before placing the busbar assembly, the method further includes: The busbar and the second interconnect are welded together by a prefabrication device to form a busbar assembly.

[0009] Optionally, the first adhesive dot includes a first single adhesive dot and a first multiple adhesive dots, and the busbar is arranged overlapping the first multiple adhesive dots; The first multi-adhesive dot includes at least two sub-adhesive dots arranged and connected along the first direction, and the first multi-adhesive dot covers the end of the first interconnect.

[0010] Optionally, the battery cell has two first edges opposite each other along the first direction and an edge connection portion near the first edge, the edge connection portion being used for welding to the first interconnect or the second interconnect; the adhesive dots further include a second adhesive dot for pre-fixing the second interconnect; Along the first direction, the first single glue dot, the first multiple glue dot, and the second glue dot are all located between the adjacent edge connection portion and the first edge, and are spaced apart from the edge connection portion, with a spacing of greater than or equal to 1 mm and less than or equal to 3 mm. And / or, the height of the first single adhesive dot, the first multiple adhesive dot, and the second adhesive dot is greater than or equal to 100 μm and less than or equal to 250 μm; And / or, the first single adhesive dot, the second adhesive dot, and the sub-adhesive dot are all circular protrusions with a diameter greater than or equal to 1.5 mm and less than or equal to 2.5 mm.

[0011] Optionally, the busbar includes an edge busbar, which overlaps with the solar cells near the edge of the photovoltaic module; And / or, the busbar includes an intermediate busbar located in the middle of the photovoltaic module, the intermediate busbar being located at the gap between two adjacent cells and overlapping with the cells on both sides.

[0012] Optionally, after placing the first interconnecting component and before placing the bus assembly, the method further includes: An insulating component is placed; wherein, after the current collector assembly is placed, the insulating component is located between the current collector assembly and the battery cell.

[0013] Optionally, after arranging the multiple solar cells into a battery pack corresponding to a photovoltaic module, and before placing the busbar module, the method further includes: A reflective film is attached to the gaps between the battery cells. The reflective film is attached to the battery cells and the current collector is placed without overlapping.

[0014] Optionally, the step of attaching reflective film at the gaps in the battery pack is performed before placing the first interconnecting member; Alternatively, the step of attaching reflective film at the gaps in the battery pack may be performed after the first interconnecting member is placed.

[0015] Optionally, the battery pack includes multiple battery cells corresponding to multiple battery strings. In each battery cell, there is a first gap between two adjacent battery cells along the first direction and a second gap between two adjacent battery cells along the second direction, wherein the second direction is perpendicular to the first direction. The step of attaching a reflective film at the gaps in the battery pack includes: A first reflective film is attached to the first gap of the battery pack; A second reflective film is attached to the second gap of the battery pack.

[0016] Optionally, before dispensing adhesive onto the solar cell to form adhesive dots, the process further includes: The first substrate and the first adhesive film are stacked together; The process of arranging multiple solar cells into a battery pack corresponding to a photovoltaic module includes: On the first adhesive film, a plurality of solar cells are arranged to form a solar cell array corresponding to a photovoltaic module; wherein the front side of the solar cells is in contact with the first adhesive film; After arranging the multiple solar cells into a battery pack corresponding to a photovoltaic module, and before placing the first interconnecting element, the method further includes: Local heating and pressure are applied to designated points on the battery cell; The area of ​​the first adhesive film that contacts the designated point is heated, causing the first adhesive film to bond with the designated point of the battery cell and the first substrate.

[0017] This invention also provides a photovoltaic module manufacturing equipment, including a dispensing device, a cell slab slab device, a strip slab device, a first slab slab device, and a laser welding device; The dispensing device is used to dispense adhesive onto the battery cells to form adhesive dots; The arranging device is used to arrange multiple solar cells into a battery pack corresponding to a photovoltaic module; The swaying device is used to place the first interconnecting component, wherein the first interconnecting component is used to electrically connect two adjacent battery cells, and the adhesive dots include first adhesive dots for pre-fixing the first interconnecting component. The first placement device is used to place a current-combining assembly, wherein the current-combining assembly includes a current-combining component and a second interconnecting component connected as one unit, the first interconnecting component and the second interconnecting component both extend along a first direction, the current-combining component overlaps with the adjacent battery cell, and the current-combining component overlaps with the adjacent first interconnecting component and the first adhesive dot. The laser welding device is used to weld the battery cell and the first interconnect and the second interconnect using a laser, wherein the laser avoids the busbar during the welding process.

[0018] Optionally, it also includes a prefabrication device for welding the busbar and the second interconnecting member together to form a busbar assembly; And / or, it also includes a film application device for applying reflective film at the gaps in the battery pack; And / or, it also includes a first hot-pressing device, which is used to locally heat and apply pressure to a set point of the battery cell; And / or, it also includes a second placement device for placing the insulating element.

[0019] Optionally, the dispensing device includes two dispensing assemblies for simultaneously dispensing adhesive onto two of the battery cells.

[0020] This invention also provides a photovoltaic module, including a battery string and a busbar. The battery string includes a plurality of battery cells arranged along a first direction. The plurality of battery cells are connected in series through a first interconnection member. The battery string is electrically connected to the busbar through a second interconnection member. The first interconnect is welded to the battery cell, and the first interconnect is pre-fixed to the battery cell by a first adhesive dot; The busbar overlaps with the adjacent battery cell, and the busbar overlaps with the adjacent first interconnect and first adhesive dot.

[0021] Optionally, the first adhesive dot includes a first single adhesive dot and a first multiple adhesive dots, and the busbar is arranged overlapping the first multiple adhesive dots; The first multi-adhesive dot includes at least two sub-adhesive dots arranged and connected along the first direction, and the first multi-adhesive dot covers the end of the first interconnect.

[0022] Optionally, the battery cell has two first edges opposite each other along the first direction and an edge connection portion near the first edge, the edge connection portion being used for welding to the first interconnect or the second interconnect; the adhesive dots further include a second adhesive dot for pre-fixing the second interconnect; Along the first direction, the first single glue dot, the first multiple glue dot, and the second glue dot are all located between the adjacent edge connection portion and the first edge, and are spaced apart from the edge connection portion, with a spacing of greater than or equal to 1 mm and less than or equal to 3 mm. And / or, the height of the first single adhesive dot, the first multiple adhesive dot, and the second adhesive dot is greater than or equal to 100 μm and less than or equal to 250 μm; And / or, the first single adhesive dot, the second adhesive dot, and the sub-adhesive dot are all circular protrusions with a diameter greater than or equal to 1.5 mm and less than or equal to 2.5 mm.

[0023] Optionally, the photovoltaic module further includes an insulating element located between the busbar and the solar cell.

[0024] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of the present invention more obvious and understandable, specific embodiments of the present invention are given below. Attached Figure Description

[0025] Figure 1This is a flowchart illustrating the steps of a photovoltaic module fabrication method according to an embodiment of the present invention. Figure 2 A flowchart illustrating the steps of another photovoltaic module fabrication method provided in this embodiment of the invention; Figure 3 This is a schematic diagram of the first substrate and the first encapsulant film stacked in another photovoltaic module manufacturing method provided by an embodiment of the present invention; Figure 4 This is a schematic diagram of adhesive dispensing in another photovoltaic module manufacturing method provided in an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the arrangement and local heating of solar cells in another photovoltaic module manufacturing method provided by an embodiment of the present invention. Figure 6 A schematic diagram illustrating the application of a reflective film in another photovoltaic module manufacturing method provided in this embodiment of the invention; Figure 7 A schematic diagram illustrating the placement of the first interconnecting element in another photovoltaic module manufacturing method provided by an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the adhesive dots on two adjacent battery cells and the first interconnecting element provided in an embodiment of the present invention; Figure 9 for Figure 8 Enlarged view of point A in the middle; Figure 10 A schematic diagram illustrating the preparation of a combiner module in another photovoltaic module preparation method provided in this embodiment of the invention; Figure 11 This is a schematic diagram illustrating the placement of insulating components in another photovoltaic module manufacturing method provided by an embodiment of the present invention; Figure 12 A schematic diagram illustrating the placement of the combiner module in another photovoltaic module manufacturing method provided in this embodiment of the invention; Figure 13 This is a schematic diagram of the structure of the edge busbar that overlaps on the battery cell according to an embodiment of the present invention; Figure 14 This is a schematic diagram of the structure of the intermediate busbar that is overlapped on the battery cell according to an embodiment of the present invention; Figure 15 A schematic diagram illustrating the welding of solar cells, a first interconnect, and a second interconnect using laser in another photovoltaic module fabrication method provided in an embodiment of the present invention; Figure 16 This is a simplified schematic diagram of a photovoltaic module provided in an embodiment of the present invention.

[0026] Figure label: 10-Battery cell, 11-Edge connection, 12-First edge, 20-Adhesive dot, 21-First adhesive dot, 211-First single adhesive dot, 212-First multiple adhesive dots, 2121-Sub-adhesive dot, 22-Second adhesive dot, 31-First interconnection, 32-Second interconnection, 40-Bus unit, 41-Edge busbar, 42-Intermediate busbar, 50-Insulator, 51-First insulator, 52-Second insulator, 60-Reflective film, 61-First reflective film, 62-Second reflective film, 70-First adhesive film, 80-Setting point, 91-First gap, 92-Second gap, 100-Battery string; 110-Dispensing device, 120-Plate-swaying device, 130-First hot-pressing device, 140-Belt-swaying device, 150-Laser welding device, 160-Flexible film, 170-Carrier device, 180-First vacuum adsorption hole, 190-Second vacuum adsorption hole. Detailed Implementation

[0027] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0028] Reference Figure 1 This invention provides a method for manufacturing photovoltaic modules, comprising: S101 involves dispensing adhesive onto the solar cell to form adhesive dots.

[0029] Reference Figure 4 Adhesive can be dispensed onto the solar cell 10 using the dispensing device 110 to form adhesive dots 20. When in use, the light-facing surface of the solar cell 10 is the front side, and the surface opposite the front side is the back side. The solar cell 10 can be a back-contact solar cell, with positive and negative electrodes on its back side; in this case, the adhesive dots 20 are located on the back side of the solar cell 10. The solar cell 10 can be a half-cell, a three-cell, a four-cell, etc. The solar cell 10 can be a solar cell with a main grid or a solar cell without a main grid.

[0030] The adhesive used in the dispensing operation can be a curing adhesive. After application, the curing adhesive is cured from a liquid or semi-solid state to a solid state, thereby achieving a fixing effect. The adhesive dots 20 are used to pre-fix the first interconnecting member 31 and the second interconnecting member 32 to prevent them from shifting.

[0031] After the solar cells 10 are loaded, they can be corrected to ensure the consistency of their placement accuracy before dispensing. During correction, the actual position of the solar cells 10 can be determined by a vision system, and the solar cells 10 can be corrected based on the deviation between the actual position and the set position. After correction, the solar cells 10 are transported to the underside of the dispensing device 110, and then the vision system captures the feature points on the solar cells 10 to determine their actual position. Then, based on this actual position, dispensing is performed at the set points on the solar cells 10. Before the correction, when the solar cells 10 are loaded, AOI (Automated Optical Inspection) technology can be used to inspect the solar cells 10 and reject defective cells.

[0032] After dispensing is completed, the solar cell 10 is conveyed to the dispensing accuracy detection device, which is used to detect defects such as the presence, size, adhesion, and positional deviation of the glue dots 20. For solar cells 10 with poor dispensing, they can be ejected using a suction cup gripper, and missing solar cells 10 can be replaced.

[0033] S102 arranges multiple solar cells into a battery pack corresponding to a photovoltaic module.

[0034] In this method, multiple solar cells 10 are arranged according to the module layout, with the back of the solar cells 10 facing upwards. (Refer to...) Figure 5 Multiple solar cells 10 can be arranged into a solar cell pack corresponding to a photovoltaic module using the cell arrangement device 120. The cell arrangement device 120 includes a robotic arm with a suction cup for adsorbing the solar cells 10. When the suction cup adsorbs the solar cells 10, its position avoids the adhesive dots 20 and avoids the main grids of the solar cells.

[0035] S103, place the first interconnect component.

[0036] Among them, reference Figure 7 The first interconnecting member 31 can be placed using a conveyor belt device 140, which may include grippers for grasping the first interconnecting member 31. (See reference...) Figure 8 The first interconnecting element 31 is used to electrically connect two adjacent battery cells 10, as shown in the reference. Figure 9 and Figure 13 The adhesive dots 20 include first adhesive dots 21 for pre-fixing the first interconnect 31, which are pre-fixed to the battery cell 10. Specifically, the first adhesive dots 21 are used to pre-fix the two ends and the middle of the first interconnect 31. When the adhesive used in the dispensing operation is a curing adhesive, refer to... Figure 2 After placing the first interconnecting component 31, the first adhesive dot 21 needs to be cured.

[0037] The battery pack includes corresponding Figure 16 Multiple battery cells in multiple battery strings 100. As an example, the battery cell 10 is a grid cell, the battery cell 10 having a grid extending along a first direction, for the battery cells 10 that are not at the beginning or end, for example Figure 8 and Figure 9 In the solar cell 10, only the first adhesive dots 21 are provided. The first adhesive dots 21 are located at both ends of the main grid. In a solar cell 10, the number of first adhesive dots 21 is twice the number of main grids.

[0038] S104, Place the busbar assembly.

[0039] Among them, reference Figure 10 The bus assembly includes a busbar 40 and a second interconnecting component 32 connected as one unit, as shown in the reference. Figure 12 Both the first interconnecting element 31 and the second interconnecting element 32 extend along a first direction, which is referred to as the X direction in the figure. The first interconnecting element 31 and the second interconnecting element 32 are welding strips, which can be flat welding strips, round wire welding strips, welding strips with elliptical or other polygonal cross-sections, multi-layer welding strips, etc.

[0040] The connection method of the busbar 40 and the second interconnector 32 is welding, such as laser welding, infrared welding, electromagnetic welding, etc. Specifically, the busbar 40 and the second interconnector 32 are first welded together by a prefabrication device to form a busbar assembly, and then the busbar assembly is placed by a first placement device.

[0041] In some embodiments, refer to Figure 12 The busbar 40 includes an edge busbar 41 located at the edge of the photovoltaic module and a middle busbar 42 located in the middle of the photovoltaic module. (See reference...) Figure 10 There are three types of busbar components: one is the intermediate busbar component, which includes an integrated intermediate busbar 42 and a second interconnecting component 32; another is the first edge busbar component, which includes an integrated second interconnecting component 32 and an edge busbar 41 located at one end of the photovoltaic module; and the third is the second edge busbar component, which includes an integrated second interconnecting component 32 and an edge busbar 41 located at the other end of the photovoltaic module.

[0042] Reference Figure 13 and Figure 14 The busbar 40 overlaps with the adjacent battery cell 10, and also overlaps with the adjacent first interconnect 31 and first adhesive dot 21. (Refer to...) Figure 13 The edge busbar 41 overlaps with the solar cell 10 near the edge of the photovoltaic module, and also overlaps with the adjacent first interconnect 31 and first adhesive dot 21. (Refer to...) Figure 14The intermediate busbar 42 is located at the gap between two adjacent battery cells 10 and overlaps with the battery cells 10 on both sides. The intermediate busbar 42 also overlaps with the adjacent first interconnect 31 and first adhesive dots 21. For these first adhesive dots 21 that overlap with the busbar 40, the first adhesive dots 21 can cover the corresponding area of ​​the first interconnect 31, so that part of the first adhesive dots 21 is located on the side of the first interconnect 31 facing the busbar 40, thereby creating a first adhesive dot 21 between the first interconnect 31 and the busbar 40.

[0043] Reference Figure 13 The adhesive dot 20 also includes a second adhesive dot 22 for pre-fixing the second interconnect 32, which is pre-fixed to the battery cell 10. The second adhesive dot 22 can be used to pre-fix the end of the second interconnect 32 away from the busbar 40. When the adhesive used in the dispensing operation is a curing adhesive, refer to... Figure 2 After placing the busbar assembly, the second adhesive point 22 needs to be cured.

[0044] S105 uses laser to weld the battery cells to the first interconnect and the second interconnect.

[0045] During the welding process, the laser avoids the busbar 40. (Refer to...) Figure 15 The first interconnecting component 31 and the second interconnecting component 32 can be welded using a laser emitted from the laser welding device 150. During the welding process, the first interconnecting component 31 and the second interconnecting component 32 can be pressed using a pressure fixture or a flexible membrane 160. Laser welding has the advantage of a small heat-affected zone, which can reduce the thermal stress and warpage of the solar cell 10, and also reduce the risk of microcracks and cracks in the solar cell 10.

[0046] After the battery cell 10 and the first interconnect 31 and the second interconnect 32 are welded together by laser, a laminated part needs to be formed and then laminated. Figure 3 The diagram shows a first substrate and a first adhesive film 70 stacked together in a laminate. The laminate also includes a battery layer, a second adhesive film, and a second substrate stacked thereon. The battery layer includes battery cells 10, a first interconnect 31, a second interconnect 32, a busbar 40, etc. The first substrate can be front-side glass. The materials of the first adhesive film 70 and the second adhesive film can be EVA (ethylene-vinyl acetate copolymer) or POE (polyolefin elastomer) or a combination of both.

[0047] In this embodiment of the invention, the busbar 40 and the second interconnect 32 are pre-connected as a single unit to form a busbar assembly. During the laser welding process of the battery cell 10 and the first interconnect 31 and the second interconnect 32, the laser does not pass through the busbar 40. This avoids the increased risk of microcracks and cracks at the edge of the battery cell 10 due to the overlap between the busbar 40 and the battery cell 10 caused by the laser passing through the busbar 40, thereby reducing the risk of microcracks and cracks at the edge of the battery cell 10 and improving the process yield. In addition, for the portion of the first interconnect 31 extending between the busbar 40 and the battery cell 10, there are first adhesive dots 21 between the first interconnect 31 and the busbar 40. These first adhesive dots 21 act as a buffer, effectively reducing the stress impact of this portion of the first interconnect 31 extending between the busbar 40 and the battery cell 10 on the edge of the battery cell 10 during the lamination process, thereby reducing the risk of microcracks and cracks at the edge of the battery cell 10 and improving the process yield.

[0048] In some embodiments, refer to Figure 13 and Figure 14 The first adhesive dot 21 includes a first single adhesive dot 211 and a first multiple adhesive dot 212. The busbar 40 is overlapped with the first multiple adhesive dot 212. The first multiple adhesive dot 212 includes at least two sub-adhesive dots 2121 arranged and connected along a first direction. The first multiple adhesive dot 212 covers the end of the first interconnecting member 31.

[0049] Preferably, the first multi-adhesive dot 212 includes two sub-adhesive dots 2121 arranged and connected along a first direction. The shape of the sub-adhesive dot 2121 may be the same as the shape of the first single adhesive dot 211, and the size of the sub-adhesive dot 2121 may or may not be the same as the size of the first single adhesive dot 211. At the first single adhesive dot 211, the end of the first interconnect 31 may extend beyond the first single adhesive dot 211. The first multi-adhesive dot 212 includes at least two sub-adhesive dots 2121 arranged and connected along the first direction, so that it can completely cover the end of the first interconnect 31 and increase the contact area between the busbar 40 and the first interconnect 31, thereby providing a buffering effect for the portion of the first interconnect 31 extending between the busbar 40 and the battery cell 10.

[0050] In some embodiments, the battery cell 10 has a connection portion for welding to a first interconnect 31 or a second interconnect 32. The connection portion may be a solder pad.

[0051] In some embodiments, refer to Figure 9 , Figure 13 and Figure 14The battery cell 10 has two first edges 12 opposite each other along a first direction. The connecting portion includes an edge connecting portion 11 near the first edge 12. The edge connecting portion 11 is used to weld with the first interconnect 31 or the second interconnect 32. Along the first direction, the first single adhesive point 211, the first multiple adhesive point 212, and the second adhesive point 22 are all located between the adjacent edge connecting portion 11 and the first edge 12, and are spaced apart from the edge connecting portion 11, with a spacing distance greater than or equal to 1 mm and less than or equal to 3 mm.

[0052] The distances between the first single adhesive dot 211, the first multiple adhesive dots 212, and the second adhesive dot 22 and the edge connection portion 11 can be the same or different. A distance greater than or equal to 1 mm between the first single adhesive dot 211, the first multiple adhesive dots 212, and the second adhesive dot 22 and the edge connection portion 11 can prevent the adhesive dots 20 from affecting the welding of the edge connection portion 11 to the first interconnecting member 31 or the second interconnecting member 32. A distance less than or equal to 3 mm allows for better matching with the length of the first interconnecting member 31 or the second interconnecting member 32, achieving good fixation of the first interconnecting member 31 and the second interconnecting member 32.

[0053] In some embodiments, the heights of the first single adhesive dot 211, the first multiple adhesive dots 212, and the second adhesive dot 22 are greater than or equal to 100 μm and less than or equal to 250 μm. This height can be measured after dispensing and before placing the first interconnecting member 31. This height refers to the distance from the highest point of the surface of the first single adhesive dot 211, the first multiple adhesive dots 212, and the second adhesive dot 22 on the side of the battery cell 10 furthest from the battery cell 10, to the surface of the battery cell 10. An adhesive dot height of 100 μm or greater ensures that after the first interconnecting member 31 and the second interconnecting member 32 are placed, the adhesive dot 20 wraps around the corresponding portions of the first interconnecting member 31 and the second interconnecting member 32 in the height direction, ensuring a secure hold. An adhesive dot height of 250 μm or less prevents excessive adhesive overflow or buildup.

[0054] In some embodiments, the first single adhesive dot 211, the second adhesive dot 22, and the sub-adhesive dot 2121 are all circular protrusions with a diameter greater than or equal to 1.5 mm and less than or equal to 2.5 mm. Specifically, this diameter refers to the diameter of the surface of the adhesive dot 20 that contacts the battery cell 10. This diameter can be measured after adhesive application and before the first interconnecting member 31 is placed. When the diameter of the adhesive dot 20 is within the above range, the diameter of the adhesive dot 20 is greater than the dimensions of the first interconnecting member 31 and the second interconnecting member 32 along the second direction to ensure a secure fixation effect and to avoid excessive adhesive application.

[0055] In some embodiments, refer to Figure 2 and Figure 11 After placing the first interconnecting component 31 and before placing the busbar assembly, the process also includes placing the insulating component 50.

[0056] In this configuration, after the current collector assembly is placed, the insulating component 50 is located between the current collector 40 and the battery cell 10 to achieve insulation between the current collector 40 and the grid lines on the battery cell 10. The insulating component 50 includes a first insulating component 51 and a second insulating component 52. The first insulating component 51 is located between the edge current collector 41 and the battery cell 10, and the second insulating component 52 is located between the middle current collector 42 and the battery cell 10.

[0057] The insulating component 50 can be made of EPE (expandable polyethylene). After the insulating component 50 is placed, it can be locally heated and pressured using a second hot-pressing device to fix it onto the battery cell 10. After the busbar 40 is placed, it can be locally heated and pressured using a third hot-pressing device to fix it together with the insulating component 50.

[0058] In some embodiments, refer to Figure 2 and Figure 6 After arranging multiple solar cells 10 into a solar cell pack corresponding to a photovoltaic module, and before placing the busbar module, the process also includes: attaching a reflective film 60 at the gaps between the solar cells.

[0059] The reflective film 60 is attached to the solar cell 10. After the busbar assembly is placed, the reflective film 60 does not overlap with the busbar assembly 40. The width of the reflective film 60 is greater than the width of the corresponding gap. During the attachment of the reflective film 60, it can be locally heat-pressed to ensure that the reflective film 60 is partially attached to the solar cell 10. The reflective film 60 does not extend beyond the edge of the first substrate.

[0060] Sunlight shines on the front of the photovoltaic module and enters the reflective film 60 through the gaps in the battery pack. After being reflected by the reflective film 60, the light is reflected to the first substrate and then reflected back to the front of the battery cell 10. The reflective film 60 enables the utilization of light incident through the gaps in the battery pack, thereby improving the light utilization rate of the photovoltaic module and thus increasing its output power. Furthermore, since the reflective film 60 is attached to the battery cell 10, the light reflected by the reflective film 60 does not need to pass through the second adhesive film, avoiding slight absorption by the second adhesive film and thus improving light gain.

[0061] In some embodiments, the battery pack includes a plurality of battery cells corresponding to a plurality of battery strings 100, as shown in the reference. Figure 5 In the battery cell, along the first direction, there is a first gap 91 between two adjacent battery cells 10, and along the second direction, there is a second gap 92 between two adjacent battery cells. The second direction is perpendicular to the first direction and refers to the Y direction in the figure.

[0062] A reflective film 60 is affixed to the gaps in the battery pack, including: affixing a first reflective film 61 at a first gap 91 in the battery pack; and affixing a second reflective film 62 at a second gap 92 in the battery pack. Along a second direction, the first reflective film 61 can be continuously or intermittently arranged. The width of the first reflective film 61 can be less than or equal to the width of the second reflective film 62.

[0063] In some embodiments, refer to Figure 2 The step of attaching the reflective film 60 at the gaps in the battery pack is performed before placing the first interconnecting component 31. In this embodiment, the reflective film 60 is attached first, and then the first interconnecting component 31 is placed. At this time, the first reflective film 61 is placed between the battery cell 10 and the first interconnecting component 31. From the front of the photovoltaic module, the first reflective film 61 can shield the first interconnecting component 31 located at the first gap 91, thereby preventing the first interconnecting component 31 from being exposed at the first gap 91 and affecting the aesthetics. This makes the module look neat and beautiful, which is especially beneficial for the appearance design of all-black photovoltaic modules.

[0064] In some embodiments, the step of attaching reflective film 60 at the gaps in the battery pack is performed after the first interconnecting member 31 is placed.

[0065] In some embodiments, before dispensing adhesive onto the battery cell 10 to form adhesive dots, the method further includes: stacking a first substrate and a first adhesive film 70. The first adhesive film 70 is disposed on top of the first substrate.

[0066] After the first substrate and the first adhesive film 70 are stacked, they can be pre-fixed. Pre-fixation methods include: pre-lamination, bonding the edge of the first adhesive film 70 to the first substrate, and clamping the edge of the first adhesive film 70 to the first substrate using a clamp. In the pre-lamination method, the entire first adhesive film 70 is bonded to the first substrate. In the method of bonding the edge of the first adhesive film 70 to the first substrate, a hot-pressing device can be used to bond the edge of the first adhesive film 70 to the first substrate, and the bonding width can be less than or equal to 15 mm. The clamp can be a strip-shaped clamp with a clamping width of less than or equal to 15 mm to avoid the clamp affecting the placement of the battery cells 10.

[0067] Arranging multiple solar cells 10 into a solar cell pack corresponding to a photovoltaic module includes: arranging the multiple solar cells 10 into a solar cell pack corresponding to a photovoltaic module on a first adhesive film 70. The front side of each solar cell 10 is in contact with the first adhesive film 70. During the arrangement of the solar cells 10, the back side of each solar cell 10 faces upwards, so that the front side of the arranged solar cells 10 is in contact with the first adhesive film 70.

[0068] Reference Figure 2 and Figure 4After arranging multiple solar cells 10 into a solar cell array corresponding to a photovoltaic module, and before placing the first interconnecting element, the method further includes: locally heating and applying pressure to the designated points 80 of the solar cells 10.

[0069] The setting point 80 can be located at one of the four corners of the solar cell 10. (Refer to...) Figure 5 The first hot-pressing device 130 can be used to locally heat and apply pressure to the set point 80 of the battery cell 10. The first hot-pressing device 130 may include a heating rod with a heating head, which is used to abut against the battery cell 10 to locally heat and apply pressure to the battery cell 10. The heating temperature can be 150℃-230℃.

[0070] When the set point 80 of the battery cell 10 is heated and pressed, the area of ​​the first adhesive film 70 that is in contact with the set point 80 is heated, so that the first adhesive film 70 is bonded to the set point 80 of the battery cell 10 and the first substrate.

[0071] In this embodiment, after the battery cell 10 is placed, local heating and pressure are applied to the designated points 80 of the battery cell 10 to achieve pre-fixation between the battery cell 10 and the first substrate. On the one hand, this prevents the battery cell 10 from shifting during subsequent transfer. On the other hand, before welding, the first substrate, the first adhesive film, and the battery cell 10 are pre-fixed. During and after welding, if the battery cell 10 tends to warp, the first substrate and the first adhesive film will hold the battery cell 10 in place, effectively preventing warping and significantly reducing the degree of warping. Furthermore, when the reflective film 60 is applied, it prevents the reflective film 60 from pulling the battery cell 10, thereby reducing the risk of displacement of the battery cell 10. During the lamination process, it also reduces the risk of displacement of the battery cell 10 caused by the shrinkage of the reflective film 60.

[0072] In some embodiments, welding the battery cell 10 and the first interconnect 31 and the second interconnect 32 by laser includes welding the battery cell 10 and the first interconnect 31 and the second interconnect 32 by laser emitted by a laser welding device.

[0073] During the welding process, the laser welding device 150 moves along a first direction and emits a laser beam. The laser welding device 150 includes a laser that outputs a laser beam, which is focused into a laser spot. The laser spot illuminates the welding position, and the center of the laser spot can be positioned at the center of the connection part. The laser spot can be rectangular or circular. The dimension of the laser spot along the second direction is larger than the dimensions of the first and second interconnecting members along the second direction. During the welding process, laser welding can be performed only in the welding area of ​​the solar cell 10, without laser welding between adjacent solar cells 10.

[0074] The laser welding device 150 includes a control module that pre-stores a pattern drawing of the photovoltaic module to be welded. The pattern drawing includes information such as the position of the battery string, the position of the cells within the battery string, the welding area on the cells, and the position of the busbar 40. Before welding begins, a vision system can capture feature points of the battery pack to determine its actual position. Based on the actual position of the battery pack and the aforementioned pattern drawing, the travel path of the laser welding device 150 can be determined. This travel path can be configured to avoid the busbar 40. Based on the actual position of the battery pack, the aforementioned pattern drawing, and the travel speed of the laser welding device 150, the laser emission time can be determined. This emission time can be configured to ensure that the laser emits light only in the welding area, avoiding non-welding areas and the busbar 40.

[0075] During the welding process, the travel path of the laser welding device 150 is controlled so that the travel path of the laser welding device 150 avoids the busbar 40, thereby avoiding the busbar 40; and / or, during the welding process, the laser emission time is controlled so that when the laser welding device 150 travels above the busbar 40, the laser welding device 150 does not emit laser light, thereby avoiding the busbar 40.

[0076] In some embodiments, the battery pack has two half-plate regions located on either side of the intermediate busbar 42, each half-plate region having N battery cells arranged at intervals along a second direction. For example, N can be 6.

[0077] Reference Figure 15 In some embodiments, the laser welding device 150 includes a laser welding assembly comprising N lasers arranged at intervals along a second direction, and each of the N lasers is used for welding N battery cells. In this embodiment, the laser welding device 150 needs to travel along a first direction from one end of the battery pack to the other, and the travel path will pass through the intermediate busbar 42. The laser emission time is controlled so that when the laser welding device 150 travels above the intermediate busbar 42, the laser welding device 150 does not emit laser light, thereby avoiding the intermediate busbar 42. At both ends of the battery pack along the first direction, the travel path avoids the edge busbar 41.

[0078] In some embodiments, the laser welding apparatus 150 includes two laser welding components, which are respectively used for welding two half-plate regions of the battery pack. In this embodiment, welding of both half-plate regions can be performed simultaneously, which can shorten welding time and improve welding efficiency.

[0079] As an example, one laser welding assembly travels between the left edge and the center of the battery pack, avoiding the left edge busbar 41 and the center busbar 42. Another laser welding assembly travels between the center and the right edge of the battery pack, avoiding the center busbar 42 and the right edge busbar 41.

[0080] In some embodiments, refer to Figure 2 Before placing the busbar assembly, the process also includes: welding the busbar 40 and the second interconnecting member 32 together using a prefabrication device to form the busbar assembly.

[0081] Reference Figure 10 There are three types of busbar components prepared by the prefabrication device: one is an intermediate busbar component, which includes an intermediate busbar 42 and a second interconnecting component 32 connected as one unit; another is a first edge busbar component, which includes a second interconnecting component 32 connected as one unit and an edge busbar 41 located at one end of the photovoltaic module; and the third is a second edge busbar component, which includes a second interconnecting component 32 connected as one unit and an edge busbar 41 located at the other end of the photovoltaic module.

[0082] In some embodiments, refer to Figure 2 After placing the first interconnecting component 31 and before placing the insulating component 50, the process includes: curing the first adhesive dot 21; after placing the busbar assembly and before welding the battery cell 10 to the first interconnecting component 31 and the second interconnecting component 32 using a laser, the process also includes: curing the second adhesive dot 22. The first adhesive dot 21 and the second adhesive dot 22 can be cured using a curing device, such as a UV (ultraviolet) curing lamp.

[0083] In some embodiments, refer to Figure 2 and Figure 15 After the second adhesive dot 22 is cured, before welding the battery cell 10 and the first interconnect 31 and the second interconnect 32 by laser, the process includes: transferring the first substrate and the first adhesive film 70, along with the battery cell 10, the first interconnect 31, the second interconnect 32, and the busbar 40 thereon, to the carrier device 170; adsorbing the first substrate through the first vacuum adsorption hole 180 on the carrier device 170; laying the flexible film 160 on the battery cell 10; adsorbing the flexible film 160 through the second vacuum adsorption hole 190 on the carrier device 170, creating a negative pressure between the flexible film 160 and the first substrate and the first adhesive film 70, so that the flexible film 160 presses the first interconnect 31 and the second interconnect 32 tightly. The flexible film 160 is transparent to laser light. The flexible film 160 is washable for reuse. A vacuum is drawn between the flexible film 160 and the first substrate and the first adhesive film 70 to form a negative pressure. On the one hand, this allows the flexible film 160 to press the first interconnect member 31 and the second interconnect member 32 tightly. On the other hand, it helps to reduce the energy loss of the laser.

[0084] In some embodiments, refer to Figure 2 After welding the battery cell 10 and the first interconnect 31 and the second interconnect 32 with a laser, the process further includes: removing the flexible film 160; transferring the first substrate and the first adhesive film 70, along with the battery cell 10, the first interconnect 31, the second interconnect 32 and the busbar 40 thereon, to the lamination station; sequentially laying the second adhesive film and the second substrate on the battery cell 10 to form a laminate; and laminating the laminate.

[0085] Reference Figure 2 This invention provides another method for manufacturing a photovoltaic module, comprising: S201, stacking a first substrate and a first adhesive film; S202, applying adhesive to the solar cells to form adhesive dots; S203, arranging multiple solar cells on the first adhesive film to form a solar cell pack corresponding to one photovoltaic module; S204, locally heating and applying pressure to designated points on the solar cells; S205, attaching reflective film at the gaps in the solar cell pack; S206, placing a first interconnecting component; S207, curing the first adhesive dots; S208, welding a current collector and a second interconnecting component together using a prefabrication device to form a current collector assembly; S209, placing an insulating component; S210, placing the current collector assembly; S211, curing the second adhesive dots; S212, stacking the first substrate and the first adhesive film and the solar cells on them. S213: The first interconnect, the second interconnect, and the busbar are transferred to the carrier device; S214: The first substrate is adsorbed through the first vacuum adsorption hole on the carrier device; S215: The flexible film is laid on the battery cell; S216: The flexible film is adsorbed through the second vacuum adsorption hole on the carrier device, so that a negative pressure is formed between the flexible film and the first substrate and the first adhesive film, so that the flexible film presses the first interconnect and the second interconnect; S217: The battery cell and the first interconnect and the second interconnect are welded by laser; S218: The flexible film is removed; S219: The first substrate and the first adhesive film, as well as the battery cell, the first interconnect, the second interconnect, and the busbar on them, are transferred to the lamination station; S210: The second adhesive film and the second substrate are sequentially laid on the battery cell to form the part to be laminated, and the part to be laminated is laminated.

[0086] Reference Figures 4 to 15This invention also provides a photovoltaic module manufacturing apparatus, including a dispensing device 110, a cell arrangement device 120, a belt arrangement device 140, a first arrangement device, and a laser welding device 150. The dispensing device 110 is used to dispense adhesive onto the solar cells 10 to form adhesive dots 20. The cell arrangement device 120 is used to arrange multiple solar cells 10 into a cell pack corresponding to a photovoltaic module. The belt arrangement device 140 is used to place first interconnecting members 31, wherein the first interconnecting members 31 are used to electrically connect two adjacent solar cells 10, and the adhesive dots 20 include components for pre-fixing the first interconnecting members. The first adhesive dot 21 of 31; the first placement device is used to place the busbar assembly, wherein the busbar assembly includes a busbar 40 and a second interconnecting member 32 connected as one unit, the first interconnecting member 31 and the second interconnecting member 32 both extend along a first direction, the busbar 40 overlaps with the adjacent battery cell 10, and the busbar 40 overlaps with the adjacent first interconnecting member 31 and the first adhesive dot 21; the laser welding device 150 is used to weld the battery cell 10 and the first interconnecting member 31 and the second interconnecting member 32 by laser, wherein during the welding process, the laser avoids the busbar 40.

[0087] After the battery cell 10 is loaded, it can be corrected to ensure the consistency of the placement accuracy of the battery cell 10 before dispensing. During the correction, the actual position of the battery cell 10 can be determined by the vision system, and the battery cell 10 can be corrected based on the deviation between the actual position and the set position. After the correction, the battery cell 10 is transported to the bottom of the dispensing device 110, and then the feature points on the battery cell 10 are captured by the vision system to determine the actual position of the battery cell 10. Then, based on the actual position, dispensing is performed at the set point of the battery cell 10.

[0088] After dispensing is completed, the solar cell 10 is conveyed to the dispensing accuracy detection device, which is used to detect defects such as the presence, size, adhesion, and positional deviation of the glue dots 20. For solar cells 10 with poor dispensing, they can be ejected using a suction cup gripper, and missing solar cells 10 can be replaced.

[0089] The cell arrangement device 120 includes a robotic arm with a suction cup for adsorbing the battery cells 10. When the suction cup adsorbs the battery cells 10, its position avoids the adhesive dots 20 and the main grids of the battery cells. The belt arrangement device 140 may include grippers for grasping the first interconnect member 31.

[0090] In this embodiment of the invention, the busbar 40 and the second interconnect 32 are pre-connected as a single unit to form a busbar assembly. During the laser welding process of the battery cell 10 and the first interconnect 31 and the second interconnect 32, the laser does not pass through the busbar 40. This avoids the increased risk of microcracks and cracks at the edge of the battery cell 10 due to the overlap between the busbar 40 and the battery cell 10 caused by the laser passing through the busbar 40, thereby reducing the risk of microcracks and cracks at the edge of the battery cell 10 and improving the process yield. In addition, for the portion of the first interconnect 31 extending between the busbar 40 and the battery cell 10, there are first adhesive dots 21 between the first interconnect 31 and the busbar 40. These first adhesive dots 21 act as a buffer, effectively reducing the stress impact of this portion of the first interconnect 31 extending between the busbar 40 and the battery cell 10 on the edge of the battery cell 10 during the lamination process, thereby reducing the risk of microcracks and cracks at the edge of the battery cell 10 and improving the process yield.

[0091] In some embodiments, the photovoltaic module manufacturing equipment further includes a prefabrication device for welding the busbar 40 and the second interconnect 32 together to form a busbar module.

[0092] Reference Figure 10 There are three types of busbar components prepared by the prefabrication device: one is an intermediate busbar component, which includes an intermediate busbar 42 and a second interconnecting component 32 connected as one unit; another is a first edge busbar component, which includes a second interconnecting component 32 connected as one unit and an edge busbar 41 located at one end of the photovoltaic module; and the third is a second edge busbar component, which includes a second interconnecting component 32 connected as one unit and an edge busbar 41 located at the other end of the photovoltaic module.

[0093] In some embodiments, the photovoltaic module manufacturing equipment further includes a film-applying device for applying a reflective film 60 to the gaps between the battery packs.

[0094] In some embodiments, refer to Figure 5 The photovoltaic module fabrication equipment also includes a first hot-pressing device 130, which is used to locally heat and apply pressure to designated points 80 of the solar cell 10. The designated points 80 can be located at the four corners of the solar cell 10. The first hot-pressing device 130 may include a heating rod with a heating head, which is used to press against the solar cell 10 to locally heat and apply pressure. The heating temperature can be between 150℃ and 230℃.

[0095] In some embodiments, the photovoltaic module manufacturing equipment further includes a second placement device for placing the insulating component 50.

[0096] In some embodiments, refer to Figure 4The dispensing device 110 includes two dispensing assemblies for simultaneously dispensing adhesive onto two solar cells 10. During dispensing, the two dispensing assemblies operate simultaneously to dispense adhesive onto both solar cells 10 at the same time, thereby improving dispensing efficiency.

[0097] In some embodiments, during the welding process, the laser welding device 150 moves along a first direction and emits a laser; during the welding process, the movement path of the laser welding device 150 is controlled so that the movement path of the laser welding device 150 avoids the busbar 40, thereby causing the laser to avoid the busbar 40; and / or, during the welding process, the laser emission time is controlled so that when the laser welding device 150 moves above the busbar 40, the laser welding device 150 does not emit a laser, thereby causing the laser to avoid the busbar 40.

[0098] Reference Figure 15 In some embodiments, the laser welding apparatus 150 includes a laser welding assembly comprising N lasers arranged at intervals along a second direction, and the N lasers are used for welding N battery cells respectively.

[0099] In some embodiments, the laser welding apparatus 150 includes two laser welding components, which are respectively used for welding two half-plate regions of the battery pack. In this embodiment, welding of both half-plate regions can be performed simultaneously, which can shorten welding time and improve welding efficiency.

[0100] In the embodiments of photovoltaic module manufacturing equipment, the specific processes, details and beneficial effects of the operations performed by each device can be referred to the corresponding descriptions in the embodiments of photovoltaic module manufacturing methods, and will not be repeated here.

[0101] Reference Figure 16 The present invention also provides a photovoltaic module, which is prepared by a photovoltaic module preparation method of any or a combination of the above embodiments.

[0102] Reference Figure 13 , Figure 14 and Figure 16 The photovoltaic module includes a cell string 100 and a busbar 40. The cell string 100 includes a plurality of cells 10 arranged along a first direction. The plurality of cells 10 are connected in series by a first interconnect 31. The cell string 100 is electrically connected to the busbar 40 by a second interconnect 32. The first interconnect 31 is welded to the cells 10 and is pre-fixed to the cells 10 by a first adhesive dot 21. The busbar 40 overlaps with the adjacent cells 10 and overlaps with the adjacent first interconnect 31 and first adhesive dot 21.

[0103] In some embodiments, refer to Figure 16The busbar 40 includes an edge busbar 41 located at the edge of the photovoltaic module and a middle busbar 42 located in the middle of the photovoltaic module. (See reference...) Figure 13 The edge busbar 41 overlaps with the solar cell 10 near the edge of the photovoltaic module, and also overlaps with the adjacent first interconnect 31 and first adhesive dot 21. (Refer to...) Figure 14 The intermediate busbar 42 is located at the gap between two adjacent battery cells 10 and overlaps with the battery cells 10 on both sides. The intermediate busbar 42 overlaps with the adjacent first interconnect 31 and first adhesive dots 21. For these first adhesive dots 21 that overlap with the busbar 40, they partially wrap around the first interconnect 31 in the height direction.

[0104] In this embodiment of the invention, for the portion of the first interconnect 31 extending between the busbar 40 and the battery cell 10, there are first adhesive dots 21 between the first interconnect 31 and the busbar 40. These first adhesive dots 21 act as a buffer, and during the lamination process, they can effectively reduce the stress impact of the portion of the first interconnect 31 extending between the busbar 40 and the battery cell 10 on the edge of the battery cell 10, thereby reducing the risk of microcracks and cell cracks at the edge of the battery cell 10 and improving the process yield.

[0105] In some embodiments, the busbar 40 and the second interconnect 32 are pre-welded together to form a busbar assembly; the battery cell 10 and the first interconnect 31 and the second interconnect 32 are welded by laser welding, and during the laser welding process, the laser avoids the busbar 40.

[0106] In this embodiment of the invention, the busbar 40 and the second interconnect 32 are pre-connected to form a busbar assembly. During the welding process of the battery cell 10 and the first interconnect 31 and the second interconnect 32 by laser, the laser does not pass through the busbar 40. This avoids the risk of microcracks and cracks at the edge of the battery cell 10 due to the overlap between the busbar 40 and the battery cell 10 caused by the laser passing through the busbar 40, thereby reducing the risk of microcracks and cracks at the edge of the battery cell 10 and improving the process yield.

[0107] In some embodiments, refer to Figure 13 and Figure 14 The first adhesive dot 21 includes a first single adhesive dot 211 and a first multiple adhesive dot 212. The busbar 40 is overlapped with the first multiple adhesive dot 212. The first multiple adhesive dot 212 includes at least two sub-adhesive dots 2121 arranged and connected along a first direction. The first multiple adhesive dot 212 covers the end of the first interconnecting member 31.

[0108] In some embodiments, refer to Figure 9 , Figure 13 and Figure 14The battery cell 10 has two first edges 12 opposite each other along a first direction and an edge connecting portion 11 near the first edge 12. The edge connecting portion 11 is used to weld with the first interconnect 31 or the second interconnect 32. The adhesive dot 20 also includes a second adhesive dot 22 for pre-fixing the second interconnect 32. Along the first direction, the first single adhesive dot 211, the first multiple adhesive dot 212, and the second adhesive dot 22 are all located between the adjacent edge connecting portion 11 and the first edge 12, and are spaced apart from the edge connecting portion 11, with a spacing distance greater than or equal to 1 mm and less than or equal to 3 mm.

[0109] In some embodiments, the heights of the first single adhesive dot 211, the first multiple adhesive dot 212, and the second adhesive dot 22 are greater than or equal to 100 μm and less than or equal to 250 μm.

[0110] In some embodiments, the first single adhesive dot 211, the second adhesive dot 22, and the sub-adhesive dot 2121 are all circular protrusions with a diameter greater than or equal to 1.5 mm and less than or equal to 2.5 mm.

[0111] In some embodiments, the photovoltaic module further includes an insulator 50 located between the busbar 40 and the solar cell 10.

[0112] In some embodiments, the photovoltaic module further includes a first reflective film 61 and a second reflective film 62; in the battery string, along the first direction, there is a first gap 91 between two adjacent battery cells 10, and the first reflective film 61 is disposed at the first gap 91; along the second direction, there is a second gap 92 between two adjacent battery strings, and the second reflective film 62 is disposed at the second gap 92.

[0113] In the photovoltaic module embodiment, the specific structural forms and beneficial effects of the first adhesive point 21, the second adhesive point 22, the insulating component 50, the first reflective film 61, and the second reflective film 62 can be referred to the corresponding descriptions in the photovoltaic module preparation method embodiment, and will not be repeated here.

[0114] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0115] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other modifications under the guidance of the present invention without departing from the spirit and scope of the present invention, and all of these modifications are within the protection scope of the present invention.

Claims

1. A method for manufacturing a photovoltaic module, characterized in that, include: Apply adhesive to the solar cells to form adhesive dots; The multiple solar cells are arranged into a solar cell pack corresponding to a photovoltaic module; Place the first interconnecting component; wherein the first interconnecting component is used to electrically connect two adjacent battery cells, and the adhesive dots include first adhesive dots for pre-fixing the first interconnecting component; A current-carrying assembly is placed, wherein the current-carrying assembly includes a current-carrying component and a second interconnecting component connected as one unit, the first interconnecting component and the second interconnecting component both extending along a first direction, the current-carrying component overlapping with an adjacent battery cell, and the current-carrying component overlapping with an adjacent first interconnecting component and a first adhesive dot; The battery cell, the first interconnect, and the second interconnect are welded together using a laser, wherein the laser avoids the busbar during the welding process.

2. The photovoltaic module manufacturing method according to claim 1, characterized in that, The laser welding of the battery cell, the first interconnect, and the second interconnect includes: The solar cell, the first interconnect, and the second interconnect are welded together using a laser emitted by a laser welding device. During the welding process, the laser welding device moves along the first direction and emits a laser. During the welding process, the travel path of the laser welding device is controlled so that the travel path of the laser welding device avoids the busbar, thereby causing the laser to avoid the busbar; and / or, during the welding process, the laser emission time is controlled so that when the laser welding device travels above the busbar, the laser welding device does not emit laser light, thereby causing the laser to avoid the busbar.

3. The photovoltaic module manufacturing method according to claim 1, characterized in that, Before placing the busbar assembly, the following is also included: The busbar and the second interconnect are welded together by a prefabrication device to form a busbar assembly.

4. The photovoltaic module manufacturing method according to claim 1, characterized in that, The first adhesive dot includes a first single adhesive dot and a first multiple adhesive dot, and the manifold is arranged overlapping the first multiple adhesive dot; The first multi-adhesive dot includes at least two sub-adhesive dots arranged and connected along the first direction, and the first multi-adhesive dot covers the end of the first interconnect.

5. The photovoltaic module manufacturing method according to claim 4, characterized in that, The battery cell has two first edges opposite each other along the first direction and an edge connection portion near the first edge, the edge connection portion being used for welding to the first interconnect or the second interconnect; the adhesive point also includes a second adhesive point for pre-fixing the second interconnect. Along the first direction, the first single glue dot, the first multiple glue dot, and the second glue dot are all located between the adjacent edge connection portion and the first edge, and are spaced apart from the edge connection portion, with a spacing of greater than or equal to 1 mm and less than or equal to 3 mm. And / or, the height of the first single adhesive dot, the first multiple adhesive dot, and the second adhesive dot is greater than or equal to 100 μm and less than or equal to 250 μm; And / or, the first single adhesive dot, the second adhesive dot, and the sub-adhesive dot are all circular protrusions with a diameter greater than or equal to 1.5 mm and less than or equal to 2.5 mm.

6. The method for preparing a photovoltaic module according to claim 4 or 5, characterized in that, The busbar includes an edge busbar, which overlaps with the solar cells near the edge of the photovoltaic module; And / or, the busbar includes an intermediate busbar located in the middle of the photovoltaic module, the intermediate busbar being located at the gap between two adjacent cells and overlapping with the cells on both sides.

7. The method for preparing a photovoltaic module according to any one of claims 1 to 5, characterized in that, After placing the first interconnecting component and before placing the busbar assembly, the method further includes: An insulating component is placed; wherein, after the current collector assembly is placed, the insulating component is located between the current collector assembly and the battery cell.

8. The photovoltaic module manufacturing method according to claim 1, characterized in that, After arranging the multiple solar cells into a battery pack corresponding to a photovoltaic module, and before placing the busbar module, the method further includes: A reflective film is attached to the gaps between the battery cells. The reflective film is attached to the battery cells and the current collector is placed without overlapping.

9. The photovoltaic module manufacturing method according to claim 8, characterized in that, The step of attaching reflective film at the gaps in the battery pack is performed before the first interconnecting component is placed. Alternatively, the step of attaching reflective film at the gaps in the battery pack may be performed after the first interconnecting member is placed.

10. The method for preparing a photovoltaic module according to claim 8 or 9, characterized in that, The battery pack includes multiple battery cells corresponding to multiple battery strings. In each battery cell, there is a first gap between two adjacent battery cells along the first direction and a second gap between two adjacent battery cells along the second direction. The second direction is perpendicular to the first direction. The step of attaching a reflective film at the gaps in the battery pack includes: A first reflective film is attached to the first gap of the battery pack; A second reflective film is attached to the second gap of the battery pack.

11. The method for preparing a photovoltaic module according to claim 1, characterized in that, Before applying adhesive to the battery cell to form adhesive dots, the process further includes: The first substrate and the first adhesive film are stacked together; The process of arranging multiple solar cells into a battery pack corresponding to a photovoltaic module includes: On the first adhesive film, a plurality of solar cells are arranged to form a solar cell array corresponding to a photovoltaic module; wherein the front side of the solar cells is in contact with the first adhesive film; After arranging the multiple solar cells into a battery pack corresponding to a photovoltaic module, and before placing the first interconnecting element, the method further includes: Local heating and pressure are applied to designated points on the battery cell; The area of ​​the first adhesive film that contacts the designated point is heated, causing the first adhesive film to bond with the designated point of the battery cell and the first substrate.

12. A photovoltaic module manufacturing equipment, characterized in that, It includes a dispensing device, a sheet-positioning device, a belt-positioning device, a first placement device, and a laser welding device; The dispensing device is used to dispense adhesive onto the battery cells to form adhesive dots; The arranging device is used to arrange multiple solar cells into a battery pack corresponding to a photovoltaic module; The swaying device is used to place the first interconnecting component, wherein the first interconnecting component is used to electrically connect two adjacent battery cells, and the adhesive dots include first adhesive dots for pre-fixing the first interconnecting component. The first placement device is used to place a current-combining assembly, wherein the current-combining assembly includes a current-combining component and a second interconnecting component connected as one unit, the first interconnecting component and the second interconnecting component both extend along a first direction, the current-combining component overlaps with the adjacent battery cell, and the current-combining component overlaps with the adjacent first interconnecting component and the first adhesive dot. The laser welding device is used to weld the battery cell and the first interconnect and the second interconnect using a laser, wherein the laser avoids the busbar during the welding process.

13. The photovoltaic module manufacturing equipment according to claim 12, characterized in that, It also includes a prefabrication device for welding the busbar and the second interconnecting member together to form a busbar assembly; And / or, it also includes a film application device for applying reflective film at the gaps in the battery pack; And / or, it also includes a first hot-pressing device, which is used to locally heat and apply pressure to a set point of the battery cell; And / or, it also includes a second placement device for placing the insulating element.

14. The photovoltaic module manufacturing equipment according to claim 12, characterized in that, The dispensing device includes two dispensing assemblies, which are used to simultaneously dispense adhesive onto two of the battery cells.

15. A photovoltaic module, characterized in that, The device includes a battery string and a busbar. The battery string includes multiple battery cells arranged along a first direction. The multiple battery cells are connected in series through a first interconnecting member. The battery string is electrically connected to the busbar through a second interconnecting member. The first interconnect is welded to the battery cell, and the first interconnect is pre-fixed to the battery cell by a first adhesive dot; The busbar overlaps with the adjacent battery cell, and the busbar overlaps with the adjacent first interconnect and first adhesive dot.

16. The photovoltaic module according to claim 15, characterized in that, The first adhesive dot includes a first single adhesive dot and a first multiple adhesive dot, and the manifold is arranged overlapping the first multiple adhesive dot; The first multi-adhesive dot includes at least two sub-adhesive dots arranged and connected along the first direction, and the first multi-adhesive dot covers the end of the first interconnect.

17. The photovoltaic module according to claim 16, characterized in that, The battery cell has two first edges opposite each other along the first direction and an edge connection portion near the first edge, the edge connection portion being used for welding to the first interconnect or the second interconnect; the adhesive point also includes a second adhesive point for pre-fixing the second interconnect. Along the first direction, the first single glue dot, the first multiple glue dot, and the second glue dot are all located between the adjacent edge connection portion and the first edge, and are spaced apart from the edge connection portion, with a spacing of greater than or equal to 1 mm and less than or equal to 3 mm. And / or, the height of the first single adhesive dot, the first multiple adhesive dot, and the second adhesive dot is greater than or equal to 100 μm and less than or equal to 250 μm; And / or, the first single adhesive dot, the second adhesive dot, and the sub-adhesive dot are all circular protrusions with a diameter greater than or equal to 1.5 mm and less than or equal to 2.5 mm.

18. The photovoltaic module according to any one of claims 15 to 17, characterized in that, The photovoltaic module also includes an insulating component located between the busbar and the solar cell.

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