A method and apparatus for the production of photovoltaic modules

Abstract

The application discloses a photovoltaic module preparation method and equipment, relates to the technical field of photovoltaic module production, and comprises the following steps: arranging a plurality of cell string matrices into a cell string group, laying an insulating film strip on the back surface of the end part of the cell string located at least at one end of the photovoltaic module; rotating and folding a plurality of wires extending out of the end part of the cell string to the back surface of the cell sheet along a bending point to form a wire bending part, and the insulating film strip is located between the back surface of the cell sheet and the wire bending part; welding a first busbar on the wire bending part, so that the first busbar is overlapped with the wire bending part, and the first busbar is heated and welded to be interconnected, the insulating film strip and the bent wire are laid in advance before the first busbar is welded, the bent wire is welded and interconnected with the busbar, the occupied area of the cell string in the unit area of the photovoltaic module is reduced, the power generation efficiency of the unit area of the photovoltaic module is improved, the preparation process steps of the photovoltaic module are simplified, and the preparation efficiency of the full-screen module is improved.

Description

Technical Field

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

[0002] In the photovoltaic industry, to improve the power generation efficiency per unit area of ​​photovoltaic modules and reduce the manufacturing cost of cells, the size of solar cells is gradually increasing. However, the busbars of conventional photovoltaic modules occupy a significant portion of the light-receiving surface, resulting in large, thick photovoltaic modules with poor appearance, high material consumption, and high costs. One existing method for manufacturing full-screen photovoltaic modules involves folding the conductors at both ends along the edge of the solar cell to the back of the cell to reduce the area of ​​the solar cell within a unit of the photovoltaic module and increase the utilization rate. Therefore, there is an urgent need for a method and apparatus for manufacturing photovoltaic modules that can bend the conductors at both ends of the module. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a method and apparatus for preparing photovoltaic modules.

[0004] In a first aspect, this application provides a method for manufacturing a photovoltaic module, comprising: arranging a plurality of battery strings in an array to form a battery string group, wherein at least one end of each battery string is provided with a plurality of wires extending out of the end of the battery string;

[0005] An insulating film strip is laid on the back of the battery cell at the end of the battery string at at least one end;

[0006] Several wires extending from the end of the battery string are rotated and folded along the bending point to the back of the battery cell to form a wire bending section. An insulating film strip is located between the back of the battery cell and the wire bending section.

[0007] A first busbar is laid on the bend of the conductor, so that the first busbar overlaps with the bend of the conductor, and then they are heated and welded together.

[0008] Furthermore, it also includes preparing a second busbar, transporting the second busbar to the back of the battery string and perpendicularly overlapping it with the first busbar, and then heating and welding them together.

[0009] Furthermore, folding several wires extending from the end of the battery string to the back of the battery cell includes: pressing against the surface of several wires extending from the end of the battery string, with the pressing point serving as a preset bending point for the wires;

[0010] The bent portion of the drive wire is rotated along the bending point and folded onto the insulating film strip on the back of the battery cell.

[0011] Furthermore, driving the bent portion of the wire to rotate along the bending point and fold over to the back of the battery cell includes: driving the bent portion of the wire to rotate along the bending point by a first angle, and after removing the force pressing against the wire, driving the bent portion of the wire to continue rotating along the bending point by a second angle, so that the bent portion of the wire is stacked on the insulating film strip on the back of the battery cell.

[0012] Further, laying an insulating film strip on the back of the battery cell at the end of the battery string at at least one end includes: laying the insulating film strip on the battery cell at the end of the battery string before the plurality of wires are rotated and folded to the back of the battery cell along the bending point; or, after driving the bent part of the wire to rotate along the bending point by a first angle, laying the insulating film strip on the back of the battery cell, and then rotating the bent part of the wire by a second angle to fold the bent part of the wire to the back of the battery cell, with the insulating film strip sandwiched between the battery cell and the bent part of the wire.

[0013] Furthermore, overlapping the first busbar with the surface of the bent portion of the conductor includes: transporting the first busbar and placing it on the upper surface of the bent portion of the conductor, and pressing the first busbar and the bent portion of the conductor into contact.

[0014] Furthermore, before folding the wires extending from the end of the battery string to the back of the battery cell, the method further includes offsetting the wires at the end of the battery string along one side by a predetermined distance, so that the bent portion of the wires forms an angle t with the solder strip on the battery cell at the bending point, where 0° < t ≤ 90°.

[0015] Secondly, this application also proposes a photovoltaic module manufacturing apparatus, which applies any of the photovoltaic module manufacturing methods described above, including:

[0016] A layout device for arranging battery strings on a carrier plate to form a battery string group that makes up a photovoltaic module;

[0017] An insulating strip placement device for placing an insulating film strip on the back of the battery cell at the end of the battery string;

[0018] A bending device is used to fold the wires extending from the edge of the solar cell at the end of the photovoltaic module to the back of the solar cell, forming a wire bending section;

[0019] The first busbar preparation device is used to prepare the first busbar and to connect the end of the first busbar to the battery string and the wire bending part.

[0020] A welding device is used to heat and weld the overlap of the first busbar and the bend of the conductor together.

[0021] Furthermore, it also includes a second busbar preparation device, which is used to prepare a second busbar, transport the second busbar to the back of the battery string and overlap it perpendicularly with the first busbar, and the welding device is used to heat the first busbar and the second busbar so that their contact surfaces are welded together.

[0022] Furthermore, it also includes a pressing device, which includes a first driving member, a second driving member, and a pressing member. The pressing member is disposed on the driving end of the first driving member, and the pressing end of the pressing member has an acute angle structure. The first driving member is disposed on the driving end of the second driving member, and the driving direction of the first driving member is perpendicular to the driving direction of the second driving member.

[0023] Furthermore, the bending device includes a receiving member for receiving the bent portion of the wire, and a rotary drive component for driving the receiving member to rotate. The rotation axis of the rotary drive component is located at the front end of the receiving member, and the front end of the receiving member is set as the bending point of the wire.

[0024] Furthermore, it also includes a conveying mechanism, which is movably disposed on the upper part of the battery string and is used to grasp and convey the end of the battery string.

[0025] The beneficial effects of this invention on battery strings are as follows: In the process of manufacturing photovoltaic modules, before welding the busbars, an insulating film strip is pre-laid on the back of the battery cell. The bent portion of the conductor is then stacked on the insulating film strip, which isolates the bent conductor from the circuit on the back of the battery cell. The insulating film strip is then welded to the busbar, which overlaps with the conductor folded onto the surface of the battery cell. The busbar is placed on top of the conductor, and the busbar and conductor are heated, electrically connecting the beginning and end of several battery strings through the busbar. The bending of the conductor at the end of the battery string is set before the busbar welding and can be implemented simultaneously in any step of battery string arrangement or insulating film strip placement. This eliminates the need for a separate device for bending the conductor at the end of the battery string in the photovoltaic module manufacturing process, simplifying the manufacturing process of full-screen photovoltaic modules and improving manufacturing efficiency. Furthermore, the manufacturing process of this photovoltaic module is suitable for full-screen photovoltaic modules. In full-screen photovoltaic modules, there are no gaps on the front side of the module, the battery strings are closely arranged, and the busbars connecting the battery strings are all located on the back side of the battery strings, which reduces the area occupied by the battery strings per unit area of ​​the photovoltaic module and improves the power generation efficiency per unit area of ​​the photovoltaic module. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the manufacturing steps of the photovoltaic module preparation method proposed in this invention;

[0028] Figure 2 for Figure 1 A partially enlarged view of the step-by-step diagram;

[0029] Figure 3 This is a schematic diagram of a photovoltaic module with a welded second busbar as proposed in this invention;

[0030] Figure 4 This is a schematic diagram of a photovoltaic module according to the present invention;

[0031] Figure 5 This is a schematic diagram of another photovoltaic module proposed in this invention;

[0032] Figure 6 This is a schematic diagram of the structure of a photovoltaic module manufacturing equipment proposed in this invention.

[0033] The attached figures are labeled as follows:

[0034] 100. Battery string; 10. Wire bending section; 20. Insulating film strip; 30. First busbar; 40. Second busbar; 1. Carrier plate; 2. Layout device; 3. Bending device; 4. Insulating strip placement device; 5. First busbar preparation device; 6. Welding device; 7. Second busbar preparation device. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0037] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] Existing photovoltaic (PV) modules consist of several cell strings 100. Each cell string 100 has a portion of its end extended with wires. These wires, extending from the cells, are connected in series or parallel with other cell strings 100 via busbars. The busbars located at the ends of the PV module and the wires welded to them occupy a portion of the effective area of ​​the PV module, failing to maximize the utilization of this area. Therefore, folding the busbar portion, which is integrated into the light-receiving surface at the ends of the PV module, to the back of the module not only improves the effective area utilization rate within the light-receiving surface and increases the power generation efficiency per unit area, but also enhances the aesthetics of the PV module by eliminating the need for busbars on the front.

[0039] This invention proposes a method for manufacturing photovoltaic modules, such as... Figure 1 , Figure 2 As shown, the specific steps for preparing a photovoltaic module in which the end wires of a battery string 100 are folded to the back of the battery string 100 include: arranging several battery strings 100 in an array to form a battery string group; laying an insulating film strip 20 on the back of the battery cell at the end of at least one end of the battery string 100 located at one end of the photovoltaic module; rotating and folding several wires extending from the end of the battery string 100 along the bending point to the back of the battery cell to form a wire bending portion 10; the insulating film strip 20 is located between the back of the battery cell and the wire bending portion 10 to prevent the bent wire bending portion 10 from contacting the back of the battery cell, forming an insulating layer to prevent the wires and the battery cell from colliding and short-circuiting; then, arranging a first busbar 30 on the wire bending portion 10 bent to the back of the battery cell, so that the first busbar 30 overlaps with all the wires of the wire bending portion 10, and heating the first busbar 30 or the wire bending portion 10 to weld the overlap together.

[0040] Before bending the wire bending section 10, several wires extending from the edge of the battery string 100 are in a free state. Preset bending points are pressed on several wires near the edge of the battery cell. The free wires on one side of the bending point are rotated along the bending point to the back of the battery cell. Then, the prepared first busbar 30 is overlapped and welded to the wire bending section 10 stacked on the back of the battery cell. By welding the busbar to the bent wires, the wires bent to the back of the battery cell are directly transferred to the busbar welding process. This integrated continuous manufacturing process has a simple logic and improves the manufacturing efficiency of the full-screen component.

[0041] In a photovoltaic module, folding the conductors extending from the ends of the battery string 100 along the bending point to the back of the battery cell includes: the conductors extending from the ends of the battery string 100 are located at one end of the photovoltaic module or at opposite ends; when located at both ends of the photovoltaic module, insulating film strips 20 are placed on the battery cells at opposite ends of the photovoltaic module, and the bent portions 10 of the conductors extending from the ends of the battery string 100 at both ends are rotated and folded onto the insulating film strips 20 of the battery cells at both ends, so as to improve the manufacturing efficiency of the photovoltaic module.

[0042] In some embodiments, such as Figure 3 As shown, the full-screen module manufacturing process also includes welding a second busbar 40 onto the photovoltaic module. The second busbar 40 is located on the back of the battery string 100 and is overlapped and welded to the first busbar 30. The second busbar 40 is connected to the junction box and is used to transmit the current from both ends of the battery string 100 to the junction box for outflow.

[0043] When the second busbar 40 is laid on the back of the battery string 100, an insulating film is also laid between the second busbar 40 and the surface of the battery string 100, so that the area of ​​the second busbar 40 other than the area in contact with the first busbar 30 does not contact the battery cells, thus preventing the busbar from short-circuiting when it comes into contact with the battery cells.

[0044] In some embodiments, refer to Figure 4 As shown, folding the wires extending from the end of the battery string 100 to the back of the battery cell includes: pressing the surface of several wires extending from the end of the battery string 100, with the pressing point serving as the bending point of the wire; while pressing the bending point, driving the wire bending portion 10 on one side of the bending point to rotate 180 degrees toward the back of the battery cell and laying it on the insulating film strip 20 laid on the surface of the battery cell at the end of the battery string 100; then moving the prepared first busbar 30 above the wire bending portion 10 bent onto the insulating film strip 20; and overlapping and heating the first busbar 30 and the wire bending portion 10 together.

[0045] The first busbar 30 can be a busbar that connects the length of the bent portion 10 of the end wire of a battery string 100, or it can be a group of busbars that are linearly arranged and segmented to connect the length of the bent portions 10 of the end wires of multiple battery strings 100. Depending on the series and parallel connection type of the component circuit, it may contain different busbar compositions.

[0046] In another embodiment, driving the wire bending portion 10 to rotate along the bending point and fold over to the back of the battery cell includes: driving the wire bending portion 10 to rotate along the bending point by a first angle; after releasing the wire, driving the wire bending portion 10 to continue rotating along the bending point by a second angle, so that the wire bending portion 10 is stacked on the insulating film strip 20 on the back of the battery cell, thus completing the bending of the wire at the end of the battery string 100. After the wire is bent by the first angle, the wire bending portion 10 and the surface of the battery cell form an angle of less than 90 degrees. After releasing the wire, the wire bending portion 10 tends to tilt towards the surface of the battery cell. When the wire bending portion 10 is driven to rotate towards one side of the battery cell, the bending point of the wire tends to bend, and the bending point does not change until the wire bending portion 10 on one side of the bending point covers the back of the battery cell.

[0047] In alternative embodiments, such as Figure 4 As shown, laying an insulating film strip 20 on the back of the battery cell at at least one end of the battery string 100 includes: laying the insulating film strip 20 on the battery cell at the end of the battery string 100 before rotating and folding several wires along the bending point to the back of the battery cell, or,

[0048] After the drive wire bending part 10 rotates at a first angle along the bending point, the insulating film strip 20 is laid on the back of the battery cell. Then, the drive wire bending part 10 is rotated at a second angle to fold the drive wire bending part 10 to the back of the battery cell, and the insulating film strip 20 is sandwiched between the battery cell and the drive wire bending part 10.

[0049] In the above embodiments, the insulating film strip 20 can be laid on the surface of the battery cell before pressing against the wire, or it can be laid during the bending of the wire, specifically including:

[0050] After the drive wire bending part 10 rotates at a first angle along the bending point, the insulating film strip 20 is laid on the back of the battery cell. Then, the drive wire bending part 10 is rotated at a second angle to clamp the insulating film strip 20 between the battery cell and the drive wire bending part 10, thereby laying the insulating film strip 20. In this embodiment, when laying the insulating film strip 20, the force pressing against the wire is released in advance to provide sufficient space for laying the insulating film strip 20 and improve the efficiency of film laying.

[0051] Preferably, the first busbar 30 is overlapped with the surface of the wire bending portion 10, which includes: transporting the first busbar 30 and placing it on the upper surface of the bent wire bending portion 10, pressing the first busbar 30 and the wire bending portion 10 into contact, and heating and welding during or after contact.

[0052] Reference Figure 5 As shown, before folding the wires extending from the end of the battery string 100 to the back of the battery cell, the wires at the end of the battery string 100 are offset by a predetermined distance along one side, so that the bent portion 10 of the wires forms an angle t with the wires on the battery cell at the bending point, where 0° < t ≤ 90°. The wires in the bent portion 10 are staggered within the gaps between the wires on the surface of the battery cell, and do not contact the wires on the surface of the battery cell. This does not increase the thickness of the wires, reduces the amount of EVA film used during photovoltaic module lamination, and also reduces the risk of air bubbles generated during module lamination, thereby improving the module production yield.

[0053] In addition, based on the above-mentioned photovoltaic module manufacturing methods, such as Figure 6 As shown, this application also proposes a photovoltaic module manufacturing equipment, including a layout device 2 for arranging cell strings 100 on a carrier plate 1, which are arranged into groups of cell strings 100 that constitute a photovoltaic module.

[0054] Insulating strip placement device 4, used to place insulating film strip 20 on the back of the battery cell;

[0055] The bending device 3 is used to fold the wires extending from the edge of the solar cell at the end of the photovoltaic module to the back of the solar cell, forming the wire bending part 10.

[0056] The first busbar preparation device 5 is used to prepare the first busbar 30 and to connect the end of the first busbar 30 to the battery string 100 and the wire bending part 10.

[0057] The welding device 6 is used to heat and weld the overlap of the first busbar 30 and the wire bend 10 together.

[0058] In the process of manufacturing photovoltaic modules, the layout device 2 arranges the battery strings 100 on the carrier plate 1, where the carrier plate 1 can be glass. Before or after the battery strings 100 are arranged on the glass plate, the bending device 3 rotates and folds the wires at the short end of the battery strings 100 along the bending point to the back of the battery cell. The battery strings 100 after the end wires are bent are transported to the busbar welding process. The first busbar preparation device 5 transfers the prepared first busbar 30 to the end of the battery string 100 and overlaps it with all the wires of the wire bending part 10. The welding device 6 welds the first busbar 30 on the wire bending part 10 and fixes the ends of all the free wires in the wire bending part 10 through the first busbar 30.

[0059] In some embodiments, a second busbar preparation device 7 is also included to prepare a second busbar 40, transport the second busbar 40 to the back of the battery string 100 and overlap it perpendicularly with the first busbar 30, and the welding device 6 is also used to heat the first busbar 30 and the second busbar 40 so that the overlap of the first busbar 30 and the second busbar 40 is welded together.

[0060] In some embodiments, a pressing device is further included. The pressing device includes a first driving member, a second driving member, and a pressing member. The pressing member is disposed on the driving end of the first driving member, and the pressing end of the pressing member has an acute angle structure. The first driving member is disposed on the driving end of the second driving member, and the driving direction of the first driving member is perpendicular to the driving direction of the second driving member.

[0061] Specifically, the bending device 3 includes a receiving member for receiving the bent portion 10 of the wire, and a rotary drive component for driving the receiving member to rotate. The rotation shaft of the rotary drive component is located at the front end of the receiving member, and the front end of the receiving member is set as the bending point of the wire.

[0062] In some embodiments, a conveying mechanism is also included. The conveying mechanism is movably disposed on the upper part of the battery string 100 for gripping and conveying the end of the battery string 100 to convey the end of the battery string 100 to the bending device 3. The bending device 3 carries the wire bending portion 10 at the end of the battery string 100 and drives the wire bending portion 10 to bend to the back of the battery cell.

[0063] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0064] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An apparatus for the production of a photovoltaic module, characterized in that The utility model relates to a photovoltaic module production line, which comprises: a layout device (2) for arranging battery strings (100) on a carrier plate (1) to form groups of battery strings (100) constituting a photovoltaic module; an insulation strip placing device (4) for placing an insulation film strip (20) on the back surface of a cell sheet at the end of the group of battery strings (100); a pressing device for pressing the surface of a plurality of wires extending out of the end of the group of battery strings, the pressing point serving as a preset bending point of the wires; the pressing device comprises a first driving member, a second driving member and a pressing member, the pressing member is arranged on the driving end of the first driving member, the pressing end of the pressing member is an acute angle structure, the first driving member is arranged on the driving end of the second driving member, the driving direction of the first driving member is perpendicular to the driving direction of the second driving member; a bending device (3) for driving the wires extending out of the end of the group of battery strings (100) at the end of the photovoltaic module to be folded to the back surface of the cell sheet to form a wire bending part (10); a first bus bar preparation device (5) for preparing a first bus bar (30) and transferring the first bus bar (30) to the end of the group of battery strings (100) to be overlapped with the wire bending part (10); 2. The photovoltaic module production apparatus according to claim 1, wherein a welding device (6) for heating and welding the overlapped part of the first bus bar (30) and the wire bending part (10) to be interconnected.

3. The photovoltaic module production apparatus according to claim 1, wherein The utility model further comprises a second bus bar preparation device (7) for preparing a second bus bar (40) and transferring the second bus bar (40) to be overlapped with the first bus bar (30) on the back surface of the group of battery strings (100), and the welding device (6) is used for heating the first bus bar (30) and the second bus bar (40) to be welded and interconnected at the contact surface.

4. The photovoltaic module production apparatus according to claim 1, wherein The bending device (3) comprises a receiving member for receiving the wire bending part (10) and a rotary driving part for driving the receiving member to rotate, the rotary shaft of the rotary driving part is arranged at the front end of the receiving member, and the front end of the receiving member is arranged as the bending point of the wire.

5. A method of manufacturing a photovoltaic module based on the apparatus for manufacturing a photovoltaic module according to any one of claims 1 to 4, characterized by, The utility model further comprises a conveying mechanism movably arranged on the upper part of the group of battery strings (100) for grabbing and conveying the end of the group of battery strings (100) to the bending device (3). The utility model relates to a photovoltaic module production line, which comprises: a plurality of battery strings (100) are arranged in a matrix to form a group of battery strings, at least one end of each battery string (100) is provided with a plurality of wires extending out of the end of the battery string (100); an insulation film strip (20) is laid on the back surface of a cell sheet at the end of the battery string (100) at the at least one end; a plurality of wires extending out of the end of the battery string (100) are folded to the back surface of the cell sheet along a bending point to form a wire bending part (10), and the insulation film strip (20) is located between the back surface of the cell sheet and the wire bending part (10); a first bus bar (30) is laid on the wire bending part (10) to be overlapped with all the wires of the wire bending part (10), and the first bus bar (30) and the wire bending part (10) are heated and welded to be interconnected.

6. The photovoltaic module production method according to claim 5, wherein The second bus bar (40) is prepared, the second bus bar (40) is carried to the back of the battery string (100) and is vertically overlapped with the first bus bar (30), and the interconnection is heated and welded.

7. The photovoltaic module production method according to claim 5, wherein The step of folding the wires extending out of the end of the battery string (100) to the back of the battery sheet includes pressing the surface of the wires extending out of the end of the battery string (100), and the pressing point is the preset folding point of the wires. The wire folding part (10) is driven to rotate along the folding point and fold onto the insulating film strip (20).

8. The photovoltaic module production method according to claim 7, wherein The wire folding part (10) is driven to rotate along the folding point and fold onto the back of the battery sheet, including: driving the wire folding part (10) to rotate along the folding point by a first angle, and after the wires are released, driving the wire folding part (10) to continue to rotate along the folding point by a second angle, so that the wire folding part (10) is stacked on the insulating film strip (20) on the back of the battery sheet of the battery sheet.

9. The photovoltaic module production method of claim 5, wherein, The insulating film strip (20) is laid on the back of the battery sheet at the end of the battery string (100) at least at one end, including: laying the insulating film strip (20) on the battery sheet at the end of the battery string (100) before the wires are rotated and folded onto the back of the battery sheet along the folding point, or After the wire folding part (10) is driven to rotate along the folding point by a first angle, the insulating film strip (20) is laid on the back of the battery sheet, and the wire folding part (10) is rotated by a second angle to fold the wire folding part (10) onto the back of the battery sheet, and the insulating film strip (20) is clamped between the battery sheet and the wire folding part (10).

10. The photovoltaic module production method according to claim 5, wherein The first bus bar (30) is overlapped with the surface of the wire folding part (10), including: carrying the first bus bar (30) to be placed on the folded wire folding part (10), and pressing the first bus bar (30) and the wire folding part (10) in contact.

11. The photovoltaic module production method according to claim 5, wherein Before the wires extending out of the end of the battery string (100) are folded to the back of the battery sheet, the wires at the end of the battery string (100) are offset by a preset distance along one side, so that the wire folding part (10) forms an angle t with the solder strip on the battery sheet at the folding point, 0°<t≤90°.

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