Photovoltaic module and method of manufacturing the same

Abstract

This application relates to the photovoltaic field, providing a photovoltaic module and its manufacturing method. The method includes: multiple solar cells; multiple solder strips, each solder strip including a first folded edge, a second folded edge, and a bent corner. The bent corner is a connection between the first and second folded edges. The solder strips include a first solder strip and a second solder strip. The first folded edges of the first solder strip and the first folded edges of the second solder strip are alternately arranged on the solar cells along a first direction, and the first folded edges extend along a second direction, intersecting the second direction. The second folded edge of the first solder strip is connected to the second folded edge of an adjacent second solder strip, and the second folded edge extends along the first direction. The photovoltaic module provided by this application solves the problem of high risk of microcracks in solar cells in the prior art.

Description

Technical Field

[0001] This application relates to the field of photovoltaics, and in particular to a photovoltaic module and its preparation method. Background Technology

[0002] Existing photovoltaic modules typically achieve electrical connection between cells by welding solder strips and busbars. The solder strips and busbars are stacked and welded in the same area of ​​the cell. Due to the structural overlap between the solder strips and busbars in the welding area, this area is relatively thick. During module encapsulation or subsequent use, the localized mechanical forces exerted on the cell in this welding area are concentrated, which can easily increase the risk of microcracks in the cell. Summary of the Invention

[0003] This application provides a photovoltaic module and its manufacturing method to at least solve the problem of high risk of microcracks in solar cells in the prior art.

[0004] According to some embodiments of this application, one aspect of this application provides a photovoltaic module, including: a plurality of solar cells; a plurality of solder strips, each solder strip including a first folded edge, a second folded edge, and a bent corner portion, the bent corner portion being a connection portion between the first folded edge and the second folded edge, the solder strip including a first solder strip and a second solder strip, the first folded edge of the first solder strip and the first folded edge of the second solder strip being alternately arranged on the solar cells along a first direction, and the first folded edge extending along a second direction, the first direction intersecting the second direction, the second folded edge of the first solder strip being connected to the second folded edge of an adjacent first solder strip, the second folded edge of the second solder strip being connected to the second folded edge of an adjacent second solder strip, the second folded edge extending along the first direction.

[0005] In some embodiments, the angle between the first folded edge and the second folded edge is 90°-93°.

[0006] In some embodiments, the photovoltaic module further includes at least one insulating film located at least on the surface of the first fold of the solder strip away from the solar cell.

[0007] In some embodiments, the photovoltaic module further includes at least one insulating film located at least on a portion of the surface of the solar cell near the second fold of the solder strip.

[0008] In some embodiments, the length of the separator in the second direction is 9-11 mm.

[0009] In some embodiments, the first folds of each of the solder strips are parallel to each other.

[0010] In some embodiments, the distance between the second fold of the first solder strip and the second fold of the adjacent second solder strip in the second direction is [value missing].

[0011] In some embodiments, the width of the solder strip in the first direction is 0.2 mm to 1 mm.

[0012] In some embodiments, the solder strip includes a metal substrate and a solder coating disposed on the surface of the metal substrate, wherein the metal substrate includes copper and the solder coating includes tin.

[0013] According to some embodiments of this application, another aspect of this application provides a method for manufacturing a photovoltaic module, comprising: disposing a plurality of first solder strips along a first direction on a plurality of solar cells; disposing a plurality of second solder strips along the first direction on the solar cells such that the first solder strips and the second solder strips are arranged alternately; and bending each of the first solder strips and each of the second solder strips to form a first folded edge, a second folded edge, and a bent corner.

[0014] The second fold of each of the first solder strips is connected to the second fold of the adjacent second solder strip to obtain a battery cell string; the battery cell string is then packaged to obtain the photovoltaic module.

[0015] In some embodiments, bending each of the first and second welding strips to form a first fold, a second fold, and a bend corner includes: providing a plurality of bending fixtures on each of the battery cells, the bending fixtures corresponding one-to-one with the first and second welding strips, each bending fixture including a cylindrical forming portion; placing the welding strip against the cylindrical forming portion and bending it around the cylindrical forming portion to form the first fold, the second fold, and the bend corner.

[0016] In some embodiments, after the plurality of first solder strips are disposed on a plurality of battery cells along a first direction, the method further includes: disposing of a plurality of separator films on the surface of the first folded edge of each first solder strip away from the battery cell, the separator films corresponding one-to-one with the first solder strips; or, disposing of a separator film on the surface of the first folded edge of each first solder strip away from the battery cell, such that the separator film covers the surface of the first folded edge of each first solder strip.

[0017] The technical solution provided in this application has at least the following advantages: By setting the solder strips to a structure with a first fold, a second fold, and a bent corner, and by arranging the first and second solder strips alternately on the battery cell, and by connecting them to each other through the second fold of each solder strip to achieve electrical connection, this application forms an interconnection structure on the battery cell achieved by the solder strips themselves, thus eliminating the need to stack busbars above or below the solder strips. Since there is no longer a thickness overlap between the solder strips and busbars in the welding area, the overall thickness of the welding area on the battery cell is reduced, reducing the local mechanical forces generated in this area during packaging or use, and reducing the risk of microcracks in the battery cell. Attached Figure Description

[0018] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the drawings in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this application or in the conventional art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a solder strip structure provided according to an embodiment of this application is shown;

[0020] Figure 2 A schematic diagram of the arrangement structure of solder ribbons on a solar cell according to an embodiment of this application is shown;

[0021] Figure 3 A schematic diagram of another arrangement structure of solder ribbons on a solar cell according to an embodiment of this application is shown;

[0022] Figure 4 A schematic flowchart of a method for manufacturing a photovoltaic module according to an embodiment of this application is shown;

[0023] Figure 5 A schematic diagram is shown of a method for placing solder strip into a bending fixture according to an embodiment of this application;

[0024] Figure 6 A schematic diagram of a structure for bending solder strips according to an embodiment of this application is shown;

[0025] Figure 7 A schematic diagram of a structure for arranging solder strips on a battery cell according to an embodiment of this application is shown;

[0026] Figure 8A schematic diagram of a structure for arranging a separator on a battery cell according to an embodiment of this application is shown;

[0027] Figure 9 A schematic diagram of another structure for arranging a separator on a battery cell according to an embodiment of this application is shown.

[0028] 10. First fold; 20. Bending corner; 30. Second fold; 40. First welding strip; 50. Second welding strip; 60. Battery cell; 70. Separator; 80. First bending fixture; 90. Second bending fixture. Detailed Implementation

[0029] As is known from the background art, in the prior art, photovoltaic modules are usually made by superimposing solder strips and busbars to achieve electrical connection. Due to the superposition of the thickness of the solder strips and busbars in the welding area, the structural thickness of this area is relatively large. During the encapsulation or use, local mechanical forces are easily concentrated, resulting in a high risk of microcracks in the cells. In order to solve the above technical problems, this application provides a photovoltaic module and its preparation method.

[0030] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0033] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0034] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to 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 embodiments of this application.

[0035] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0036] In the accompanying drawings corresponding to the embodiments of this application, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0037] In the description of the embodiments of this application, when a component "includes" another component, other components are not excluded unless otherwise stated, and other components may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly on" the other component (i.e., located on the surface of the other component with no other components between them), or another component may be present therein. Moreover, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located therein.

[0038] The terminology used in the description of the various embodiments described herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments and the appended claims, the term "foreword" is also intended to include the plural form unless the context clearly indicates otherwise. Components include layers, films, regions, or plates, etc.

[0039] The embodiments of this application will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this application to facilitate a better understanding of the application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0040] This embodiment provides a photovoltaic module, including:

[0041] Multiple solar cells 60;

[0042] Multiple solder strips, such as Figure 1 As shown, the aforementioned welding strip includes a first folded edge 10, a second folded edge 30, and a bent corner portion 20. The bent corner portion 20 is the connecting portion between the first folded edge 10 and the second folded edge 30. Multiple welding strips include multiple first welding strips 40 and multiple second welding strips 50, as shown... Figure 2 As shown, the first fold 10 of the first welding strip 40 and the first fold 10 of the second welding strip 50 are alternately arranged on the battery cell 60 along the first direction X, and the first fold 10 extends along the second direction Y. The first direction X intersects the second direction Y. The second fold 30 of the first welding strip 40 is connected to the second fold 30 of the adjacent first welding strip 40. The second fold 30 of the second welding strip 50 is connected to the second fold 30 of the adjacent second welding strip 50. The second fold 30 extends along the first direction X.

[0043] In the above embodiments, by alternately arranging the first folded edges 10 of the first solder strip 40 and the second solder strip 50 along the first direction and welding them onto the battery cell 60 respectively, while connecting the second folded edges 30 of adjacent solder strips, a stable electrical connection path can be formed without superimposing busbars, reducing the thickness of the welding area and local stress concentration, thereby reducing the risk of microcracks in the battery cell 60 and improving the reliability of the module connection.

[0044] Specifically, when the battery cell 60 is a battery cell 60 with a main grid, its back surface is provided with a main grid and a fine grid. The main grid includes a first main grid and a second main grid that are alternately distributed along the first direction X, and both the first and second main grids extend along the second direction Y. The fine grid includes a first fine grid and a second fine grid that are alternately distributed along the second direction Y, and both the first and second fine grids extend along the first direction X. These are used to collect and guide the photocurrent generated in the battery body. The first fine grid intersects with the first main grid and forms an electrical connection, so that the first main grid can collect and output the photocurrent collected by the first fine grid. The second fine grid intersects with the second main grid and forms an electrical connection, so that the second main grid can collect and output the photocurrent collected by the second fine grid. In this embodiment, the first main grid and the second main grid have opposite polarities; one is the positive main grid of the battery cell 60, and the other is the negative main grid of the battery cell 60. The first fine grid has the same polarity as the first main grid, and the second fine grid has the same polarity as the second main grid. The first fine grid is disconnected at the second main grid. At least its ends are coated with insulating adhesive to prevent short circuits caused by electrical connection between the first fine grid and the second main grid. The second fine grid is spaced apart from the first main grid, meaning it is disconnected at the first main grid to prevent short circuits caused by electrical connection between the second fine grid and the first main grid. A first solder strip 40 is disposed at the first main grid, with its first folded edge 10 covering and adhering to the corresponding first main grid. The first folded edge 10 is then welded to the first main grid to form a welded electrical connection. A second solder strip 50 is disposed at the second main grid, with its first folded edge 10 covering and adhering to the corresponding second main grid. The first folded edge 10 is then welded to the second main grid to form a welded electrical connection. Optionally, when the back surface of the solar cell 60 is provided with pads connected to the main grid, the first folded edge 10 of the first solder strip 40 is soldered to the first pad electrically connected to the first main grid, and the first folded edge 10 of the second solder strip 50 is soldered to the second pad electrically connected to the second main grid, so as to realize the electrical connection between the solder strip and the main grid. Along the first direction described above, the second folded edges 30 of adjacent first solder strips 40 are overlapped, and the second folded edges 30 of the first solder strip 40 form a welded electrical connection with the second folded edges 30 of the adjacent first solder strips 40, thereby forming an electrical connection between adjacent solder strips.

[0045] It should be noted that the first direction intersects with the second direction, such as... Figure 2 As shown, one of the first direction X and the second direction Y can be the length direction of the battery cell 60, and the other can be the width direction of the battery cell 60.

[0046] In the case where the solar cell 60 is a gridless solar cell, the back surface of the gridless solar cell is provided with a first fine grid and a second fine grid. The first fine grid and the second fine grid are arranged at intervals along a first direction X and extend along a second direction Y. The polarities of the first fine grid and the second fine grid are opposite. The first folded edge 10 of the first solder ribbon 40 extends in a direction perpendicular to the first fine grid and is electrically connected to the first fine grid, but insulated from the second fine grid. The first folded edge 10 of the second solder ribbon 50 extends in a direction perpendicular to the first fine grid and is electrically connected to the second fine grid, but insulated from the first fine grid.

[0047] In some exemplary embodiments, the angle between the first folded edge 10 and the second folded edge 30 is 90°-93°.

[0048] Specifically, a bending angle 20 is provided between the first folded edge 10 and the second folded edge 30, so that the first folded edge 10 and the second folded edge 30 form an angle. Adjacent solder strips are connected by overlapping through their respective second folded edges 30, and since the second folded edges 30 of the solder strips are all provided on the battery cell 60, the first folded edge 10 and the second folded edge 30 will form an angle of 90°-93°.

[0049] In the above embodiments, by setting the included angle between the first folded edge 10 and the second folded edge 30 to 90°-93°, the second folded edge 30 can be made to fit against the surface of the battery cell 60, avoiding the second folded edge 30 from partially lifting up and causing a height difference at the connection position, thus reducing the risk of microcracks in the battery cell 60.

[0050] In some other exemplary embodiments, the photovoltaic module further includes:

[0051] At least one separator 70, wherein the separator 70 is located at least on the portion of the surface of the first fold 10 of the solder strip away from the battery cell 60.

[0052] In the case of multiple separator membranes (70 in total), such as Figure 3 As shown, multiple separators 70 are respectively disposed on the surface of the first fold 10 of the first welding strip 40 near the bending corner 20, and multiple separators 70 are respectively located on the surface of the second fold 30 of the second welding strip 50 near the battery cell 60.

[0053] When the separator membrane is 70mm thick, such as Figure 2 As shown, the separator 70 covers a portion of the surface of the first fold 10 of the first solder strip 40 near the bend corner 20, parallel to the first direction X, and covers the surface of the second fold 30 of the second solder strip 50 near the cell 60.

[0054] In the above embodiments, by setting the isolation membrane 70 to electrically isolate adjacent solder strips, direct contact between adjacent solder strips is avoided to prevent electrical connection, thereby reducing the risk of short circuit in photovoltaic modules and improving the electrical connection reliability of modules.

[0055] In another alternative, such as Figure 2 As shown, the length L of the aforementioned separator 70 in the second direction Y is 9-11 mm.

[0056] In the above embodiments, by limiting the length of the isolation membrane 70 in the second direction, the isolation membrane 70 can cover the area where adjacent solder strips are most likely to come into contact, thereby effectively preventing short circuits caused by direct contact between solder strips of different polarities due to positional offset, pressure, etc. At the same time, the length is not too large, which can reduce the obstruction of other areas of the solder strip and the amount of material used, taking into account both insulation reliability and structural rationality.

[0057] In some exemplary embodiments, the first folds 10 of each of the aforementioned solder strips are parallel to each other.

[0058] In the above embodiments, the parallel first fold edges 10 of each solder strip can make the arrangement of the solder strips on the battery cell 60 more regular, ensuring that the bonding direction of each solder strip with the corresponding main grid or solder pad is consistent, and reducing the offset of the welding position.

[0059] In other exemplary embodiments, such as Figure 2 As shown, the distance D between the second fold 30 of the first weld strip 40 and the second fold 30 of the adjacent second weld strip 50 in the second direction Y is 2-15mm.

[0060] In the above embodiments, by limiting the distance D, it is possible to ensure a reliable overlapping connection of the second folded edges 30 of adjacent solder strips while avoiding direct contact and short circuits between adjacent solder strips of different polarities due to excessive distance.

[0061] In one alternative, such as Figure 1 As shown, the width d of the first solder strip 40 or the second solder strip 50 in the first direction X is 0.2mm-1mm.

[0062] In the above embodiments, by limiting the width of the solder strip, it is possible to reduce the shading of the solder strip on the solar cell 60 while ensuring current transmission capability.

[0063] In another alternative embodiment, the solder strip includes a metal substrate and a welding coating disposed on the surface of the metal substrate, wherein the metal substrate includes copper and the welding coating includes tin.

[0064] In the above embodiments, by using a copper substrate and providing a tin soldering coating on its surface, the solder strip has both good conductivity and solderability, thereby improving soldering reliability and electrical connection stability.

[0065] Embodiments of this application also provide a method for preparing a photovoltaic module, such as... Figure 4 As shown, it includes:

[0066] Step S101: Place multiple first welding strips 40 onto multiple battery cells 60 along the first direction X;

[0067] Step S102: Multiple second welding strips 50 are disposed on the battery cell 60 along the first direction X, so that the first welding strip 40 and the second welding strip 50 are arranged alternately.

[0068] Step S103: Bend each of the first welding strips 40 and each of the second welding strips 50 to form a first fold 10, a second fold 30 and a bent corner 20.

[0069] Step S104: Connect the second fold 30 of each of the first welding strips 40 to the second fold 30 of the adjacent second welding strips 50 to obtain a series of 60 battery cells.

[0070] Step S105: Encapsulate the above 60 strings of solar cells to obtain the above photovoltaic module.

[0071] In the above embodiments, by using the alternating arrangement of the first solder strip 40 and the second solder strip 50 and connecting them to each other through the second folded edge 30, the electrical connection between the battery cells 60 is achieved. This eliminates the need for traditional busbars to complete current collection and transmission, reduces the number of conductive structures inside the module, simplifies the module structure, and helps to reduce the number and thickness of welding layers, reduce mechanical stress on the battery cells 60, and reduce the risk of microcracks in the battery cells 60.

[0072] In one alternative embodiment, each of the first weld strips 40 and each of the second weld strips 50 is bent to form a first fold 10, a second fold 30, and a bent corner 20, including:

[0073] Multiple bending fixtures are provided on each of the aforementioned battery cells 60. The bending fixtures correspond one-to-one with the first welding strip 40 and the second welding strip 50. Each bending fixture includes a cylindrical forming part.

[0074] The welding strip is placed against the cylindrical forming part and bent around the cylindrical forming part so that the first welding strip 40 and the second welding strip 50 form the first fold 10, the second fold 30 and the bent corner 20.

[0075] In the above embodiments, by setting bending fixtures corresponding one-to-one with the welding strips on the battery cell 60, and using cylindrical forming parts to guide the welding strips to bend around them, the bending position and bending rate of the welding strips can be kept consistent, thereby stably forming the first fold 10, the second fold 30, and the bending corner 20, reducing the angle deviation and dimensional fluctuation caused by manual bending; at the same time, the cylindrical forming parts can make the bending transition smoother, reduce the stress concentration and material damage risk at the bending point, and make the welding strips adhere better to the surface of the battery cell 60, which is conducive to improving the connection consistency and reliability of the second fold 30 of adjacent welding strips, and reducing the local mechanical stress generated by the welding strips on the battery cell 60, thus reducing the risk of microcracks in the battery cell 60.

[0076] In another alternative embodiment, after the plurality of first solder strips 40 are disposed on the plurality of solar cells 60 along the first direction, the method further includes:

[0077] A plurality of separator films 70 are provided on the surface of the first folded edge 10 of each of the first weld strips 40 away from the battery cell 60, and each separator film 70 corresponds to one of the first weld strips 40.

[0078] Alternatively, a separator 70 may be provided on the surface of the first fold 10 of the first solder strip 40 that is away from the battery cell 60, so that the separator 70 covers the surface of the first fold 10 of each of the first solder strips 40.

[0079] In the above embodiments, by setting an isolation film 70 on the side of the first folded edge 10 of the first solder strip 40 away from the solar cell 60, reliable electrical isolation can be formed between adjacent solder strips, preventing solder strips of different polarities from directly contacting each other during subsequent bending, overlapping, or lamination processes, thus reducing the risk of short circuits in the photovoltaic module. When the isolation film 70 is set in a one-to-one correspondence with the first solder strip 40, targeted insulation protection can be provided at corresponding positions of each solder strip, ensuring consistent isolation effects between the solder strips. When a single isolation film 70 covers the first folded edges 10 of multiple first solder strips 40, the number of isolation films 70 and the setting process can be reduced while meeting insulation requirements, simplifying the process and reducing material usage.

[0080] The method for preparing the photovoltaic module described above in this application will be specifically described below with reference to specific embodiments. The method includes:

[0081] Step S1: As Figure 5 As shown, firstly, multiple first welding strips 40 are placed into multiple first bending fixtures 80, including cylindrical forming parts;

[0082] Step S2: As Figures 5 to 6As shown, the first welding strip 40 is bent around the cylindrical forming part of the first bending fixture 80 to obtain a bending angle part 20 with a bending angle of 90°-93°. A second bending fixture 90 including a cylindrical forming part is provided at the connection between the second folded edge 30 of the first welding strip 40 and the second folded edge 30 of the adjacent first welding strip 40, and the connection between the second folded edge 30 of the first welding strip 40 and the second folded edge 30 of the adjacent first welding strip 40 is lap welded.

[0083] Step S5: As Figure 7 As shown, the first weld strip 40 after welding is placed at the corresponding welding point of the battery cell 60, and the first weld strip 40 is welded to the battery cell 60.

[0084] Step S6: As Figures 7 to 8 As shown, a whole strip of separator 70 is laid on the surface of the first fold 10 of the first weld strip 40 away from the battery cell 60, or, as... Figures 7 to 9 As shown, on the surface of the first folded edge 10 of the first solder strip 40 away from the battery cell 60, a plurality of separators 70 are provided one-to-one, and the size of the plurality of separators 70 is 10mm×10mm.

[0085] Step S7: The second welding strip 50, which has been shaped by the bending fixture, is welded and fixed onto the aforementioned battery cell 60, resulting in the following: Figure 2 or Figure 3 The battery string shown.

[0086] Those skilled in the art will understand that the above embodiments are specific examples of implementing this application, and in practical applications, various changes in form and detail can be made without departing from the spirit and scope of this application. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this application; therefore, the scope of protection of this application should be determined by the scope defined in the claims.

Claims

1. A photovoltaic module, characterized in that, include: Multiple battery cells; Multiple welding strips, each welding strip including a first folded edge, a second folded edge, and a bent corner portion, wherein the bent corner portion is the connection portion between the first folded edge and the second folded edge, the welding strip including a first welding strip and a second welding strip, the first folded edge of the first welding strip and the first folded edge of the second welding strip are alternately arranged on the battery cell along a first direction, and the first folded edge extends along a second direction, the first direction intersecting the second direction, the second folded edge of the first welding strip overlaps with the second folded edge of the adjacent first welding strip, the second folded edge of the second welding strip overlaps with the second folded edge of the adjacent second welding strip, and the second folded edge extends along the first direction.

2. The photovoltaic module according to claim 1, characterized in that, The angle between the first fold and the second fold is 90°-93°.

3. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module also includes: At least one separator film, the separator film being located at least on the portion of the surface of the solder strip away from the first fold of the solar cell.

4. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module also includes: At least one separator film, the separator film being located at least on the second fold of the solder strip near the portion of the surface of the battery cell.

5. The photovoltaic module according to claim 3 or 4, characterized in that, The length of the isolation membrane in the second direction is 9-11 mm.

6. The photovoltaic module according to claim 1, characterized in that, The first folded edges of each of the aforementioned welding strips are parallel to each other.

7. The photovoltaic module according to claim 1, characterized in that, The distance between the second fold of the first solder strip and the second fold of the adjacent second solder strip in the second direction is 2-15mm.

8. The photovoltaic module according to claim 1, characterized in that, The width of the welding strip in the first direction is 0.2mm-1mm.

9. The photovoltaic module according to claim 1, characterized in that, The solder strip includes a metal substrate and a solder coating disposed on the surface of the metal substrate, wherein the metal substrate includes copper and the solder coating includes tin.

10. A method for preparing a photovoltaic module, characterized in that, include: Multiple first welding strips are disposed on multiple battery cells along a first direction; Multiple second solder strips are arranged on the battery cell along the first direction, so that the first solder strips and the second solder strips are arranged alternately. Each of the first and second welding strips is bent to form a first fold, a second fold, and a bend corner, wherein the first fold extends along a second direction, the first direction intersects the second direction, and the second fold extends along the first direction; The second fold of each of the first solder strips is overlapped with the second fold of the adjacent first solder strip to obtain a battery cell string; The battery cell string is packaged to obtain the photovoltaic module.

11. The method according to claim 10, characterized in that, Bending each of the first and second weld strips to form a first fold, a second fold, and a bend corner, includes: Multiple bending fixtures are provided on each of the battery cells, and the bending fixtures correspond one-to-one with the first welding strip and the second welding strip. Each bending fixture includes a cylindrical forming part. The welding strip is placed against the cylindrical forming part and bent around the cylindrical forming part so that the first welding strip and the second welding strip form the first folded edge, the second folded edge and the bent corner.

12. The method according to claim 10, characterized in that, After attaching multiple first solder strips along a first direction onto multiple battery cells, the method further includes: Multiple separator films are disposed on the surface of each of the first weld strips on the portion of the first folded edge away from the battery cell, with each separator film corresponding to one of the first weld strips. Alternatively, an isolation film may be provided on the surface of the first fold of the first solder strip away from the battery cell, such that the isolation film covers the surface of the first fold of each of the first solder strips.

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