Photovoltaikmodul

Abstract

Photovoltaic module, comprehensive: a solar cell string group (305), wherein the solar cell string group (305) comprises at least two solar cell strings (303) arranged along a first direction (X), wherein the solar cell string (303) comprises solar cells (301) and solder strips (302); wherein a plurality of solar cell string groups (305) are arranged along a second direction (Y), wherein the first direction (X) intersects the second direction (Y); a second busbar (12) which is provided in the first direction (X) on one or each of the two sides of the solar cell string assembly (305); and a connecting section (13) which is arranged in the thickness direction of the solar cell (301) on a side of the second busbar (12) facing a solar cell (301) of the solar cells (301), wherein the second busbar is arranged on a rear surface of the solar cell string assembly, wherein the second busbar (12) and the solder strip (302) are electrically connected by the connecting section (13), where the second busbar (12) partially overlaps the solar cell (301) along the thickness direction of the solar cell (301).

Description

TECHNICAL AREA

[0001] The present disclosure relates to the technical field of solar cells and in particular to a photovoltaic module. BACKGROUND

[0002] The photovoltaic module comprises a multitude of solar cell strings. Each solar cell string contains a multitude of solar cells. The multitude of solar cell strings are arranged in a first direction and electrically connected to form a solar cell string group. A multitude of solar cell string groups are arranged in a second direction. The orientation of the solar cell string group is defined as the first direction, which intersects with the second direction.

[0003] The photovoltaic module also includes a busbar extending in the second direction. In the first direction, the busbar is located on one or both sides of the solar cell string group and is electrically connected to adjacent solar cell string groups, allowing for series or parallel connection of these groups.

[0004] In general, the busbar is located outside the solar cell string group in the first direction, i.e., a gap is provided between the busbar and an adjacent solar cell in the first direction, and a solder strip (or solder strip) on the solar cell string group extends outwards in the first direction and is attached to the busbar by soldering.

[0005] Due to the gap, the space required for arranging the busbar and the solar cell string group is relatively large. Within the limited space, the number of solar cell strings must be reduced to accommodate the space needed for the busbars, which in turn affects the output power of the photovoltaic module.

[0006] Therefore, the question of how to reduce the space required for the busbar and the solar cell string group in order to improve the output power of the photovoltaic module is an important problem that needs to be solved in engineering. SUMMARY

[0007] In view of this, the present disclosure provides a photovoltaic module and its manufacture which can reduce the space required for a busbar and a solar cell string assembly in order to improve the output power of the photovoltaic module.

[0008] A first aspect of the present disclosure provides a photovoltaic module comprising a solar cell string assembly, a second busbar, and a connecting section. The solar cell string assembly comprises at least two solar cell strings arranged along a first direction. The solar cell string contains a plurality (or multiple) of solar cells and a plurality (or multiple) solder strips. In the first direction, adjacent solar cells are electrically connected by at least one of the solder strips, and adjacent solar cell strings are electrically connected by at least one of the solder strips. A plurality (or multiple) solar cell string assembly is arranged along a second direction. The first direction intersects the second direction. In the first direction, the second busbar is located on one side or on two sides of the solar cell string assembly.A connecting section is located in the thickness direction of the solar cell on one side of the second busbar facing the solar cell. The second busbar and at least one of the solder strips are electrically connected to each other via the connecting section, and adjacent solar cell string groups are electrically connected to each other via the second busbar. The second busbar is located on a rear surface of the solar cell string group. In the thickness direction of the solar cell, a projection of the second busbar partially overlaps with a projection of the solar cell.

[0009] In one or more embodiments, the connecting section is attached to the second busbar by soldering or thermocompression fixing. Alternatively, the second busbar and the connecting section are formed as a single piece (integral).

[0010] In one or more embodiments, the second busbar comprises a first edge and a second edge arranged in a first direction. In the first direction, the first edge is located on a side of the second busbar facing the solar cell string assembly, and the second edge is located on a side of the second busbar facing away from the solar cell string assembly. An edge of the connecting section is aligned with the second edge in the thickness direction of the solar cell.

[0011] In one or more embodiments, in the first direction, the width of the second busbar is equal to H1, the width of the connecting section is equal to H2, and 1.3 < H1 / H2 ≤ 75. In the second direction, the length of the connecting section is less than the length of the second busbar.

[0012] In one or more embodiments, the solder strip comprises an edge solder strip. The edge solder strip comprises a first body and a second body arranged along the first direction. The first body is electrically connected to the solar cell, and the second body is electrically connected to the connection section. In the second direction, the width of the second body is greater than the width of the first body.

[0013] In one or more embodiments, the thickness of the second body is smaller than the thickness of the first body in the thickness direction of the solar cell.

[0014] In one or more embodiments, the edge solder strip is located on a light-receiving surface or a rear surface of the solar cell. If the edge solder strip is located on the light-receiving surface of the solar cell, the distance between a light-receiving surface of the first body and the rear surface of the solar cell, in the thickness direction of the solar cell, is equal to L1, the distance between a light-receiving surface of the second busbar and the rear surface of the solar cell is equal to L2, and the thickness of the interconnect section is equal to L3, where L2 ≤ L3 < L1, or L2 < L3 ≤ L1.If the edge solder strip is located on the back of the solar cell, in the thickness direction of the solar cell, a distance between the light-receiving surface of the first body and the light-receiving surface of the second busbar is equal to L4, a distance between a rear surface of the first body and the light-receiving surface of the second busbar is equal to L5, and a thickness of the interconnection section is equal to L6, where L5 ≤ L6 < L4, or L5 < L6 ≤ L4.

[0015] In one or more embodiments, the connecting section has a rectangular cross-section.

[0016] In one or more embodiments, the photovoltaic module also includes an insulating rail. The insulating rail is located in the thickness direction of the solar cell between the second busbar and the solar cell.

[0017] In one or more embodiments, the insulating strip extends in the first direction towards an outside of the solar cell in the direction of the connecting section.

[0018] In one or more embodiments, an insulating strip is located in the second direction. Alternatively, there is a plurality of insulating strips in the second direction that correspond one-to-one with the solar cell string groups. Alternatively, there is a plurality of insulating strips in the second direction, wherein one of the insulating strips is connected to at least two of the solar cell string groups.

[0019] A second aspect of the present disclosure provides a teaching for the formation of a photovoltaic module, comprising the following steps. A solar cell string assembly is formed. The solar cell string assembly comprises at least two solar cell strings arranged along a first direction. The solar cell string assembly comprises a plurality of solar cells and a plurality of solder strips. In the first direction, adjacent solar cells are electrically connected by at least one of the solder strips, and adjacent solar cell strings are electrically connected by at least one of the solder strips. A plurality of solar cell string assemblies is arranged along a second direction. The first direction intersects the second direction. A connecting section is placed in the first direction on one side or on both sides of the solar cell string assembly.The interconnection section extends along the second direction and is adjacent to a rear surface of the solar cell string assembly in the thickness direction of the solar cell. The interconnection section is attached to the solder strip by soldering. An encapsulation layer and a cover plate are placed onto a light-receiving surface and the rear surface of the solar cell string assembly, and then laminated and fixed to form a laminate. A frame is mounted to one edge of the laminate to form a photovoltaic module. Before or after the step of placing the interconnection section on one or both sides of the solar cell string, the assembly process further includes: attaching the interconnection section to the second busbar by soldering.

[0020] In one or more embodiments, the solder strip comprises an edge solder strip, and prior to the step of forming the solar cell string assembly, the method for forming the photovoltaic module comprises: flattening one end of the edge solder strip to form a second body. The step of attaching the connecting section and the solder strip by soldering comprises: attaching the connecting section and the second body by soldering.

[0021] In one or more embodiments, the step of forming the solar cell string group comprises: arranging a plurality of solar cells along the first direction; applying the solder strip to the solar cell and securing it by soldering to form the solar cell string; arranging at least two of the solar cell strings along the first direction; and securing the solder strips of adjacent solar cell strings by soldering to form the solar cell string group.

[0022] In one or more embodiments, the solder strip comprises a first solder strip and a second solder strip, and the step of forming the solar cell string group comprises: arranging a plurality of solar cells along the first direction; placing the first solder strip on the solar cell and securing it by soldering to form the solar cell string; arranging at least two of the solar cell strings along the first direction; and placing two ends of the second solder strip on each adjacent solar cell strings and securing them by soldering to form the solar cell string group in the first direction.

[0023] In one or more embodiments, the teaching for forming the photovoltaic module prior to the step of arranging the at least two solar cell strings in the first direction further comprises: placing an insulating strip on the solar cell string, wherein the insulating strip is arranged in the thickness direction of the solar cell on a rear surface of the solar cell; and fixing the insulating strip and the solar cell string by spot bonding (thermocompression spot bonding).

[0024] In one or more embodiments, the teaching for forming the photovoltaic module prior to the step of attaching the connecting section and the solder strip by soldering further comprises: placing an insulating strip on the solar cell string assembly, wherein the insulating strip is located in the thickness direction of the solar cell on a rear surface of the solar cell; and attaching the insulating strip and the solar cell string assembly by spot gluing.

[0025] In the present disclosure, the second busbar is located on the rear surface of the solar cell, such that part of the second busbar structure is shielded by the solar cell. Without changing the size of the solar cell or the second busbar in the first direction, the overall size of the second busbar and the solar cell string can be reduced in the first direction, thereby reducing the required space for the second busbar and the solar cell string. Furthermore, more solar cells can be arranged in a limited space, thus improving the screen-to-body ratio of the photovoltaic module and increasing the output power of the photovoltaic module.

[0026] The second busbar and the edge solder strip are electrically connected by the connecting section extending in the third direction, thus reducing the risk of bending-related breakage and solder joint cracks of the edge solder strips, as well as the risk of hidden cracks that occur during the lamination process due to the local increase in thickness of the solar cell layer, thereby improving the process yield and the operational stability of the photovoltaic module.

[0027] It should be clear that the above general description and the following detailed description are merely illustrative and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To illustrate the technical solutions in the embodiments of this disclosure more clearly, the drawings to be used in describing these embodiments are briefly described below. It will be evident that other drawings described below merely represent some embodiments of this disclosure, and that those skilled in the art can obtain other drawings corresponding to these without having to exert any creative effort. Fig. Figure 1 is a structural cross-sectional view of a photovoltaic module according to some embodiments of the present disclosure; Fig. Figure 2 is a partial schematic structural diagram of a solar cell according to some embodiments of the present disclosure; Fig. 3 is a top view of a solar cell layer according to some embodiments of the present disclosure; Fig. 4 is an enlarged view of the in Fig. Part A shown in section 3; Fig. 5 is an enlarged view of the in Fig. Part B shown in section 3; Fig. Figure 6 shows a cross-sectional view of a connection structure between a first busbar and a solar cell string in the relevant prior art; Fig. Figure 7 is a cross-sectional view of a connection structure between a second busbar and a solar cell string according to some embodiments of the present disclosure; Fig. 8 is a schematic structure diagram of the first busbar in Fig. 6, which is folded towards the rear surface of the solar cell; Fig. 9 is a top view of a connection structure between a second busbar and a connecting section; Fig. Figure 10 is a top view of a connection structure between a connecting section and an edge solder strip in a third direction; Fig. Figure 11 is a partial schematic structure diagram of an edge solder strip; Fig. 12 is a cross-sectional view of a connection structure between a second busbar and a solar cell string according to some embodiments of the present disclosure; Fig. Figure 13 is a cross-sectional view of an insulating strip according to some embodiments of the present disclosure; Fig. 14 is a bottom view of a connection structure between an insulating strip and a cell in a marginal area according to some embodiments of the present disclosure; Fig. 15 is a bottom view of a connection structure between an insulating strip and a cell in a marginal area according to some embodiments of the present disclosure; Fig. Figure 16 is a bottom view of a connection structure between an insulating strip and a cell in a marginal area according to some embodiments of the present disclosure; Fig. Figure 17 is a cross-sectional view of a connection structure between a second busbar and a solar cell string according to some embodiments of the present disclosure; Fig. Figure 18 is a cross-sectional view of a connection structure between a second busbar and a solar cell string according to some embodiments of the present disclosure; Fig. 19 is a flowchart of a teaching for the formation of a photovoltaic module according to some embodiments of the present disclosure; Fig. Figure 20 is a flowchart of a teaching for the formation of a photovoltaic module according to some embodiments of the present disclosure; Fig. 21 is a flowchart of some steps of a teaching for the formation of a photovoltaic module according to some embodiments of the present disclosure; Fig. 22 is a schematic structural diagram of a solar cell string group according to some embodiments of the present disclosure; Fig. 23 is a flowchart of step A1 according to some embodiments of the present disclosure; Fig. Figure 24 is a schematic structural diagram of a solar cell string group according to some embodiments of the present disclosure; Fig. 25 is a flowchart of step A1 according to some embodiments of the present disclosure; Fig. 26 is a flowchart of the connection between an insulating strip and a solar cell string group according to some embodiments of the present disclosure; Fig. 27 is a flowchart of the connection between an insulating strip and a solar cell string group according to some embodiments of the present disclosure; Fig. Figure 28 shows a cross-sectional view of a connection structure between a first intermediate connecting strip and a solar cell string in the relevant prior art; Fig. 29 is a cross-sectional view of a connection structure between a second intermediate connecting strip and a solar cell string according to some embodiments of the present disclosure; Fig. Figure 30 is a schematic structure diagram of the first intermediate connecting strip in Fig. 28, which is folded onto the rear surface of the solar cell; Fig. Figure 31 is a top view of a connecting structure between a second intermediate connecting strip and an intermediate connecting section in a third direction; Fig. Figure 32 is a top view of a connection structure between an intermediate connection section and an electrical connector in a third direction; Fig. Figure 33 is a partial schematic structure diagram of an electrical connector according to some embodiments of the present disclosure; Fig. 34 is a top view of an electrical connector according to some embodiments of the present disclosure; Fig. Figure 35 is a partial structural diagram of an electrical connector according to some embodiments of the present disclosure; Fig. 36 is a cross-sectional view of a connection structure between a second intermediate connecting strip and a solar cell string according to some embodiments; Fig. Figure 37 is a cross-sectional view of an insulator; Fig. Figure 38 is a bottom view of a connection structure between an insulator and a first end solar cell according to some embodiments of the present disclosure; Fig. Figure 39 is a bottom view of a connection structure between an insulator and a first end solar cell according to some embodiments of the present disclosure; Fig. Figure 40 is a bottom view of a connection structure between an insulator and a first end solar cell according to some embodiments of the present disclosure; Fig. 41 is a cross-sectional view of an intermediate region of a solar cell string group according to some embodiments of the present disclosure; Fig. 42 is a cross-sectional view of an intermediate region of a solar cell string group according to some embodiments of the present disclosure; Fig. Figure 43 is a flowchart of a teaching for the formation of a photovoltaic module according to some embodiments of the present disclosure; Fig. Figure 44 is a flowchart of a teaching for the formation of a photovoltaic module according to some embodiments of the present disclosure; Fig. 45 is a flowchart of some steps of step S1 according to some embodiments of the present disclosure; Fig. 46 is a flowchart of the steps in Fig. 45 according to some embodiments of the present disclosure; Fig. 47 is a flowchart of some steps of step S1 according to some embodiments of the present disclosure; Fig. 48 is a flowchart of the steps in Fig. 47 according to some embodiments of the present disclosure; Fig. 49 is a flowchart of some steps of step S1 according to some embodiments of the present disclosure; and Fig. Figure 50 is a flowchart of some steps of step S1 according to some embodiments of the present disclosure. Reference symbol:

[0029] 10 - Cover plate; 101 - First cover plate; 102 - Second cover plate; 20 - encapsulation layer; 201 - first adhesive film; 202 - second adhesive film; 30 - Solar cell layer; 301 - Solar cell; 3011 - First end solar cell; 3012 - Second end solar cell; 302 - Solder strip; 3021 - First solder strip; 3022 - Second solder strip; 303 - solar cell string; 3031 - first solar cell string; 3032 - second solar cell string; 304 - Busbar element; 305 - Solar cell string assembly; 1 - power rail; 11 - first power rail; 111 - first gap; 12 - second power rail; 121 - first edge; 122 - second edge; 13 - connecting section; 2 - Intermediate connecting strip; 21 - First intermediate connecting strip; 211 - Second gap; 22 - Second intermediate connecting strip; 23 - Intermediate connecting section; 3 - Edge solder strip; 31 - First body; 32 - Second body; 4 - electrical connector; 41 - electrical connector body; 411 - first electrical connector body; 412 - second electrical connector body; 42 - electrical connection section; 421 - first connection section; 422 - second connection section; 43 - first electrical connector; 44 - second electrical connector; 5 - insulating strip; 51 - first layer body; 52 - second layer body; 53 - third layer body; 6 - insulator; 61 - first insulating layer; 62 - second insulating layer; 63 - third insulating layer. DESCRIPTION OF EXECUTION FORMS

[0030] To better understand the technical solutions of the present disclosure, the embodiments of the present disclosure are described in more detail below in conjunction with the drawings.

[0031] It should be clear that the described embodiments represent only some, and not all, embodiments of the present disclosure. All other embodiments that a person skilled in the art obtains without inventive effort according to the embodiments of the present disclosure fall within the scope of protection of the present disclosure.

[0032] The terms used in the embodiments of this disclosure serve only to describe certain embodiments and are not intended to limit the present disclosure. The singular forms "a" and "the" used in the embodiments of this disclosure and the appended claims also include the plural forms, unless the context clearly indicates otherwise.

[0033] It is understood that the term "and / or," used in the context of this revelation, is intended to describe a correlational relationship between related objects and indicates that there can be three relationships; for example, A and / or B can mean only A, both A and B, or only B. Furthermore, the symbol " / " in this context generally indicates that the relationship between the objects before and after the " / " is an "or" relationship.

[0034] A first aspect of the present disclosure provides a photovoltaic module. Fig. Figure 1 is a structural cross-sectional view of the photovoltaic module provided in some embodiments of the present disclosure. As in Fig. As shown in Figure 1, the photovoltaic module comprises a cover plate 10, an encapsulation layer 20 and a solar cell layer 30.

[0035] The cover plate 10 comprises a first cover plate 101 and a second cover plate 102, arranged along the third direction Z. The encapsulation layer 20 and the solar cell layer 30 are located between the first cover plate 101 and the second cover plate 102. Part of the encapsulation layer 20 is located between the solar cell layer 30 and the first cover plate 101, and the other part of the encapsulation layer 20 is located between the solar cell layer 30 and the second cover plate 102, thus achieving the encapsulation and fixation of the cover plate 10 and the solar cell layer 30.

[0036] At least one of the first cover plate 101 and the second cover plate 102 consists of a translucent material that contributes to improving the photoelectric conversion efficiency of the photovoltaic module.

[0037] The material of the first cover plate 101 can be a rigid material, such as tempered glass, polyethylene terephthalate (PET), and polycarbonate (PC). Alternatively, the material of the first cover plate 101 can also be a flexible material, such as polyvinyl fluoride (PVF), ethylene tetrafluoroethylene (ETFE), and polyvinylidene fluoride (PVDF). All of the above-mentioned materials exhibit high light transmittance, which ensures that more light reaches the solar cell layer, thereby increasing the light absorption of the photovoltaic module and improving its photoelectric conversion efficiency.

[0038] The material of the second cover plate 102 can be a rigid material, such as tempered glass, polyethylene terephthalate (PET), and polycarbonate (PC). Alternatively, the material of the second cover plate 102 can be a flexible material, such as polyvinyl fluoride (PVF), ethylene tetrafluoroethylene (ETFE), and polyvinylidene fluoride (PVDF).

[0039] The material of the first cover plate 101 and the second cover plate 102 can be the same or different from each other.

[0040] As in Fig. As shown in Figure 22, the encapsulation layer 20 comprises a first adhesive film 201 and a second adhesive film 202. Along the third direction Z, part of the structure of the first adhesive film 201 is located between the solar cell layer 30 and the first cover plate 101, and part of the structure of the second adhesive film 202 is located between the solar cell and the second cover plate 102.

[0041] The material of the first adhesive film 201 is a polyolefin such as ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE), or polyvinyl butyral (PVB). The aforementioned materials exhibit high light transmittance, which contributes to improving the photoelectric conversion efficiency of the photovoltaic module. The first adhesive film 201 can also be an EPE adhesive film (EVA-POE-EVA coextrusion structure) or an EP adhesive film (EVA-POE coextrusion structure).

[0042] The material of the second adhesive film 202 is one made of polyolefins such as ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE), or polyvinyl butyral (PVB). The second adhesive film 202 can also be an EPE adhesive film (EVA-POE-EVA coextrusion structure) or an EP adhesive film (EVA-POE coextrusion structure).

[0043] The material of the first adhesive film 201 and the second adhesive film 202 can be the same or different.

[0044] Fig. Figure 2 is a partial schematic structure diagram of a solar cell according to some embodiments of the present disclosure. As in Fig. As shown in Figure 2, a solar cell layer 30 comprises a plurality of solar cells 301. In the first direction X, adjacent solar cells 301 are electrically connected via a solder strip 302 to form a solar cell string 303. One thickness direction of the solar cell 301 runs parallel to the third direction Z.

[0045] Fig. Figure 3 is a top view of a solar cell layer according to some embodiments of the present disclosure. As in Fig. As shown in Figure 3, adjacent solar cell strings 303 in the first direction X and / or the second direction Y are electrically connected via a busbar element 304. The busbar element 304 is configured such that a series or parallel connection is achieved between adjacent solar cell strings 303. One thickness direction of the solar cell string 303 runs parallel to the third direction Z. The first direction X, the second direction Y, and the third direction Z can intersect in pairs.

[0046] In the first direction X, the distance between adjacent solar cells 301, for example, is in the range of -1 mm to 2 mm, which can be -1 mm, -0.5 mm, 0 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm or the like.

[0047] In some embodiments, the distance between adjacent solar cells 301 is in the range of -1 mm to 0 mm, wherein it is -1 mm, -0.9 mm, -0.8 mm, -0.7 mm, -0.6 mm, -0.5 mm, -0.4 mm, -0.3 mm, -0.2 mm, -0.1 mm, 0 mm or the like.

[0048] In some embodiments, the distance between adjacent solar cells 301 is in the range of 0 mm to 2 mm, where this may be 0 mm, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm or the like.

[0049] In the first direction X, the distance between adjacent solar cells 301, for example, is in the range of -0.3 mm to 2 mm, which is -0.2 mm, -0.1 mm, 0 mm, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm or the like.

[0050] In one or more embodiments, the spacing between adjacent solar cells 301 is in the range of -0.3 mm to 2 mm, thereby reducing the area of ​​a void on the photovoltaic module. The void refers to an area where no solar cell is arranged and no photoelectric conversion can take place. By reducing the area of ​​the void, the proportion of the light-receiving area of ​​the photovoltaic module can be increased, thereby improving the power output per unit area of ​​the photovoltaic module and increasing the efficiency of the photovoltaic module.

[0051] In some embodiments, the distance between adjacent solar cells is in the range of -0.3 mm to 0 mm, which may be -0.3 mm, -0.29 mm, -0.28 mm, -0.27 mm, -0.26 mm, -0.25 mm, -0.24 mm, -0.23 mm, -0.22 mm, -0.21 mm, -0.2 mm, -0.19 mm, -0.18 mm, -0.17 mm, -0.16 mm, -0.15 mm, -0.14 mm, -0.13 mm, -0.12 mm, -0.11 mm, -0.1 mm, -0.09 mm, -0.08 mm, -0.07 mm, -0.06 mm, -0.05 mm, -0.04 mm, -0.03 mm, -0.02 mm, -0.01 mm, 0 mm or the like.

[0052] In some embodiments, the distance between adjacent solar cells is in the range of 0 mm to 1 mm, which may be 0 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm or the like.

[0053] In some embodiments, the distance between adjacent solar cells is in the range of 1 mm to 2 mm, which may be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm or the like.

[0054] In the first direction X, the distance between adjacent solar cell strings 303, for example, is in the range of 0.3 mm to 6 mm, which can be 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm or the like.

[0055] In some embodiments, the distance between adjacent solar cell strings 303 is in the range of 0.3 mm to 2 mm, which may be 0.3 mm, 0.5 mm, 1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2 mm or the like.

[0056] In some embodiments, the distance between adjacent solar cell strings 303 is in the range of 0.3 mm to 1 mm, which may be 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm or the like.

[0057] In some embodiments, the distance between adjacent solar cell strings 303 is in the range of 1 mm to 2 mm, which may be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm or the like.

[0058] In some embodiments, the distance between adjacent solar cell strings 303 is in the range of 2 mm to 4 mm, which may be 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm or the like.

[0059] In some embodiments, the distance between adjacent solar cell strings 303 is in the range of 4 mm to 6 mm, which may be 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm, 5.2 mm, 5.4 mm, 5.6 mm, 5.8 mm, 6 mm or the like.

[0060] The types of solar cells include, but are not limited to, a Passivated Emitter Rear Cell (PERC), a Tunnel Oxide Passivated Contact (TOPCon), a Heterojunction with Intrinsic Thin-film (HJT), a Perovskite cell, or the like.

[0061] The PERC cell comprises, sequentially along its thickness direction, a front surface with a silver-metal electrode, a front surface with a silicon nitride passivation layer, a phosphor emitter, a p-type silicon substrate layer, a local aluminum backfield, a rear surface with an aluminum-metal electrode, and a rear passivation layer (Al₂O₃ / WiNₓ). In the PERC cell, a passivation film is used to passivate the back surface and replace a back field consisting entirely of aluminum. This improves the internal back reflection of light on a silicon substrate, reduces the recombination rate on the back surface, and increases the solar cell's efficiency by 0.5% to 1%.

[0062] The TOPCon cell comprises, in sequence along its thickness direction, a silver-metal electrode, a silicon nitride passivation layer on the front surface, a boron-doped emitter, an N-type silicon substrate layer, a diffusion doping layer, ultrathin silicon oxide, doped polysilicon, silicon nitride, and a silver-metal electrode. The back side of the solar cell consists of a layer of ultrathin silicon oxide (1 nm to 2 nm) and a layer of phosphorus-doped microcrystalline amorphous Wi mixed film, which together form a passivated contact structure. This structure can prevent the recombination of minority charge carriers and holes, thereby increasing the open-circuit voltage and short-circuit current of the solar cell. The ultrathin oxide layer can block the recombination of minority electrons and holes while simultaneously allowing many electrons to tunnel into a polysilicon layer.A good passivation effect of the ultrathin silicon oxide and a heavily doped silicon film causes the surface energy band of a silicon wafer to curve, creating a field passivation effect that significantly increases the probability of electron tunneling, reduces contact resistance, and improves the open-circuit voltage and short-circuit current of the solar cell, thereby increasing the efficiency of the solar cell.

[0063] The HJT solar cell comprises, in succession along its thickness direction, a front low-temperature silver electrode, a front conductive film, an N-type amorphous silicon film, an intrinsic amorphous silicon film, an N-type substrate silicon layer, a P-type amorphous silicon film, a rear conductive film, and a rear low-temperature silver electrode.

[0064] The perovskite cell comprises, in sequence along its thickness direction, a substrate material, a conductive layer, an electron transport layer (titanium dioxide), a perovskite absorption layer (hole transport layer), and a metal cathode. The perovskite material exhibits a relatively high light absorption coefficient and a relatively long charge carrier diffusion distance. After the photons absorbed by the perovskite material are converted into electrons, they are readily collected by an electrode with low loss, generating a relatively high photovoltage and photocurrent. Thus, the perovskite cell exhibits a relatively high photoelectric conversion efficiency.

[0065] The specific structure of the solar cell is described in more detail below, using the TOPCon cell as an example.

[0066] Fig. 4 is an enlarged view of the in Fig. Part A shown in section 3. As in Fig. 3 and Fig. As shown in Figure 4, the busbar element 304 comprises a busbar 1 in the first direction X, which is located at the outermost edge of the solar cell layer; that is, the busbar 1 is arranged on one side or on both sides of the solar cell layer in the first direction X. The solder strip 302 comprises an edge solder strip 3, which is arranged on the outside of the solar cell layer. One end of the edge solder strip 3 is electrically connected to the outermost solar cell 301, and the other end of the edge solder strip 3 extends outwards and is electrically connected to the busbar 1.

[0067] If solar cell 301 is a TOPCon cell, both the light-receiving surface and the rear surface of solar cell 301 are connected to the solder strip 302.

[0068] Fig. 5 is an enlarged view of the in Fig. Part B shown in section 3. As in Fig. 3 and Fig. As shown in Figure 5, the busbar 304 in the first direction X includes an intermediate connecting strip 2 located between adjacent solar cell strings 303. The solder strip 302 includes an electrical connector 4. Two ends of the electrical connector 4 are each electrically connected to the solar cells 301 on the adjacent solar cell strings 303, such that the adjacent solar cell strings 303 are connected in series or parallel to form a solar cell string group 305. The plurality of solar cell string groups 305 is arranged along the second direction Y. In the second direction Y, at least two solar cell string groups 305 are electrically connected to the same intermediate connecting strip 2, such that the adjacent solar cell string groups 305 are connected in series or parallel.

[0069] The cross-sectional shape of the 302 solder strip can be circular or rectangular.

[0070] If the cross-sectional shape of the solder strip 302 is circular, then the solder strip 302 is a circular solder strip. The diameter of the solder strip 302 is in the range of 0.2 mm to 0.35 mm. In some embodiments, the diameter of the solder strip 302 can be 0.2 mm, 0.21 mm, 0.23 mm, 0.25 mm, 0.27 mm, 0.29 mm, 0.3 mm, 0.31 mm, 0.35 mm, or the like.

[0071] In some embodiments, the diameter of the solder strip 302 is in the range of 0.2 mm to 0.3 mm and can be 0.2 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm, 0.3 mm or the like.

[0072] In some embodiments, the diameter of the solder strip 302 is in the range of 0.3 mm to 0.35 mm and can be 0.3 mm, 0.31 mm, 0.32 mm, 0.33 mm, 0.34 mm, 0.35 mm or the like.

[0073] One side of the in Fig. The busbar 1 shown in Figure 4 is referred to as the edge region of the solar cell layer 30, and one side of the Fig. The intermediate connecting strip 2 shown in Figure 5 is referred to as the intermediate region of the solar cell layer 30. The connecting structures of the edge region and the intermediate region are discussed separately below.

[0074] First, the connection structure of the edge area will be explained in detail.

[0075] Fig. Figure 6 is a sectional view of a connection structure between a busbar and a solar cell string in the relevant prior art. As in Fig. As shown in Figure 6, the busbar 1 is referred to as the first busbar 11 in the relevant prior art. A first gap 111 is provided between the first busbar 11 and the adjacent solar cell 301 in the first direction X. The first gap 111 results in a relatively large space for the first busbar 11 and the solar cell strings 303. Within this limited space, it is necessary to reduce the number of solar cell strings 303 to create the space required for the first busbar 11, which in turn affects the output power of the photovoltaic module.

[0076] In order to reduce the space required for the busbar 1 and the solar cell strings 303 in this context, shows Fig. 7 A sectional view of a connection structure between the busbar and the solar cell string according to some embodiments of the present disclosure. As in Fig. As shown in Figure 7, the busbar 1 is referred to as the second busbar 12 in one or more embodiments of the present disclosure. The busbar element 304 further comprises a connecting section 13. In the third direction Z, the connecting section 13 is located on one side of the second busbar 12 facing the solar cell 301, and the second busbar 12 is electrically connected to the edge solder strip 3 via the connecting section 13, such that adjacent solar cell string groups are electrically connected via the second busbar 12. The second busbar 12 is located on the rear surface of the solar cell string, i.e., in the third direction Z, part of the structure of the second busbar 12 is located on the rear surface of the solar cell 301, so that the projection of the second busbar 12 in the third direction Z partially overlaps with the projection of the solar cell in the third direction Z.

[0077] In one or more embodiments, the second busbar 12 is located on the rear surface of the solar cell 301, so that part of the structure of the second busbar 12 is shielded by the solar cell 301. Without adjusting the dimensions of the solar cell 301 or the second busbar 12 in the first direction X, the overall size of the second busbar 12 and the solar cell string 303 in the first direction X can be reduced, thereby reducing the space required for the second busbar 12 and the solar cell string 303. This allows for the arrangement of additional solar cells 301 within a limited space, thus improving the ratio of effective area to the body area of ​​the photovoltaic module and increasing the output power of the photovoltaic module.

[0078] Based on the in Fig. According to the relevant prior art shown in Figure 6, the first busbar 11, when arranged on the rear surface of the solar cell, must be folded, with the folded structure in Fig. Figure 8 is shown. Subsequently, part of the edge solder strip structure 3, together with the first busbar 11, is folded onto the rear surface of the solar cell 301. At the first busbar 11, the total thickness of the solar cell layer 30 is determined by the thickness of the edge solder strip 3 facing the light-receiving area, the thickness of the solar cell 301, the thickness of the first busbar 11, and the thickness of the edge solder strip 3 facing the light-receiving area. This locally increases the thickness of the solar cell layer 30, leading to a relatively high risk of hidden cracks occurring during the subsequent lamination process. Furthermore, folding the edge solder strip 3 can cause it to break and become damaged, and can also increase the risk of cracks in the solder joints.

[0079] Therefore, as in Fig. Figure 7 shows that in one or more embodiments the second busbar 12 and the edge solder strip 3 are electrically connected to each other via the connecting section 13 extending in the third direction Z, so that the risk of breakage and cracks caused by bending on the edge solder strip 3 as well as the risk of hidden cracks that may occur during the lamination process due to the local increase in thickness of the layer of solar cells 30 is reduced, thereby improving the process yield and the operational stability of the photovoltaic module.

[0080] The second busbar 12 and the connecting section 13 can be formed in one piece to simplify the connection difficulties and reduce the connection time.

[0081] Alternatively, the second busbar 12 and the connecting section 13 have a split structure, and the second busbar 12 and the connecting section 13 are firmly joined together by soldering or thermocompression fixing, thus reducing the processing difficulties of the second busbar 12 and the connecting section 13 and thereby shortening the processing time. The connecting section 13 can then be a solder strip, and its cross-sectional shape can be circular or rectangular; that is, the connecting section 13 can be a circular solder strip or a flat solder strip.

[0082] The connecting section 13 and the edge solder strip 3 are firmly connected to each other by soldering or thermocompression fixing, so that the processing effort for the connecting section 13 and the edge solder strip 3 is reduced and the processing time is thereby shortened.

[0083] As in Fig. As shown in Figure 7, the second busbar 12 comprises a first edge 121 and a second edge 122, which are arranged along the first direction X. In the first direction X, the first edge 121 is located on a side of the second busbar 12 facing the solar cell string group 305, while the second edge 122 is located on a side of the second busbar 12 facing away from the solar cell string group 305. In the third direction Z, an edge of the connecting section 13 is aligned with the second edge 122.

[0084] In one or more embodiments, the connecting section 13 is aligned with an edge of the second busbar 12, resulting in a gap between the connecting section 13 and the solar cell 301 in the first direction X. This reduces the risk of a short circuit of the solar cell 301 caused by direct contact between the connecting section 13 and the solar cell 301. Furthermore, the connecting section 13 is aligned with the outer edge of the second busbar 12. Due to the gap between the connecting section 13 and the solar cell 301 in the first direction X, the overall size of the connecting section 13, the second busbar 12, and the solar cell string 303 in the first direction X can be reduced. This allows the solar cell 301 to be arranged in a confined space and improves the output power of the photovoltaic module.

[0085] As in Fig. As shown in Figure 7, in the first direction X the width of the second busbar 12 is equal to H1, the width of the connecting section 13 is equal to H2, where 1.3 < H1 / H2 ≤ 75 applies. In some embodiments, H1 / H2 may be equal to 1.31, 1.5, 1.7, 2, 2.7, 3, 3.7, 4, 4.7, 5, 5.7, 6, 6.7, 7, 7.7, 8, 8.7, 9, 9.7, 10, 10.7, 11, 11.7, 12, 12.7, 13, 13.7, 14, 14.7, 15, 15.7, 16, 16.6, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75 or the like.

[0086] If H1 / H2 is relatively small, the width difference between the second busbar 12 and the connecting section 13 is relatively small, and the contact between the connecting section 13 and the solar cell 301 leads to a relatively high risk of a short circuit of the solar cell 301.

[0087] If H1 / H2 is relatively large, the width of the second busbar 12 is relatively large, resulting in relatively high material costs for the second busbar 12. Alternatively, the width of the connecting section 13 is relatively small, leading to a relatively low current transmission capacity of the connecting section 13 and also resulting in relatively low connection stability between the connecting section 13 and the edge solder strip 3.

[0088] Therefore, in one or more embodiments, 1.3 < H1 / H2 ≤ 75, which allows the width difference between the second busbar 12 and the connection section 13 to be increased, thereby reducing the risk of a short circuit of the solar cell 301 caused by contact between the connection section 13 and the solar cell 301. Furthermore, the width of the second busbar 12 can be reduced, lowering the material costs of the second busbar 12, and the width of the connection section 13 can be increased, thereby improving the current transmission capacity of the connection section 13 and the connection stability between the connection section 13 and the edge solder strip 3, and thus increasing the output power and operational stability of the photovoltaic module.

[0089] In some embodiments, 1.3 < H1 / H2 ≤ 1.7, and H1 / H2 can be 1.31, 1.33, 1.35, 1.37, 1.39, 1.4, 1.41, 1.43, 1.45, 1.47, 1.49, 1.5, 1.51, 1.53, 1.55, 1.57, 1.59, 1.6, 1.61, 1.63, 1.65, 1.67, 1.69, 1.7 or the like.

[0090] In some embodiments, 1.7 ≤ H1 / H2 ≤ 10.7, and H1 / H2 can be 1.7, 1.71, 1.75, 2, 2.5, 2.7, 3, 3.5, 3.7, 4, 4.5, 4.7, 5, 5.5, 5.7, 6, 6.5, 6.7, 7, 7.5, 7.7, 8, 8.5, 8.7, 9, 9.5, 9.7, 10, 10.5, 10.7 or the like.

[0091] In some embodiments, 10.7 ≤ H1 / H2 ≤ 16.7, and H1 / H2 can be 10.7, 10.71, 10.75, 11, 11.3, 11.5, 11.7, 11.9, 12, 12.1, 12.3, 12.5, 12.7, 12.9, 13, 13.1, 13.3, 13.5, 13.7, 13.9, 14, 14.1, 14.3, 14.5, 14.7, 14.9, 15, 15.1, 15.3, 15.5, 15.7, 15.9, 16, 16.1, 16.3, 16.5, 16.6, 16.69 or similar.

[0092] In some embodiments, 1.3 < H1 / H2 < 16.7, and H1 / H2 may be 1.31, 1.5, 1.7, 2, 2.7, 3, 3.7, 4, 4.7, 5, 5.7, 6, 6.7, 7, 7.7, 8, 8.7, 9, 9.7, 10, 10.7, 11, 11.7, 12, 12.7, 13, 13.7, 14, 14.7, 15, 15.7, 16, 16.6 or the like.

[0093] In some embodiments, 16.7 ≤ H1 / H2 ≤ 20, and H1 / H2 can be 16.7, 16.8, 16.9, 17, 17.2, 17.4, 17.6, 17.8, 18, 18.2, 18.4, 18.6, 18.8, 19, 19.2, 19.4, 19.6, 19.8, 20 or the like.

[0094] In some embodiments, 20 ≤ H1 / H2 ≤ 55, and H1 / H2 can be 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50 or the like.

[0095] In some embodiments, 55 ≤ H1 / H2 ≤ 75, and H1 / H2 can be 55, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 75 or the like.

[0096] The width H1 of the second busbar 12 satisfies the following equation: 4 mm ≤ H1 ≤ 15 mm. In some embodiments, H1 can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm or the like.

[0097] In some embodiments, 4 mm ≤ H1 ≤ 7 mm, and H1 may be 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm, 5.2 mm, 5.4 mm, 5.6 mm, 5.8 mm, 6 mm, 6.2 mm, 6.4 mm, 6.6 mm, 6.8 mm, 7 mm or the like.

[0098] In some embodiments, 7 mm ≤ H1 ≤ 10 mm, and H1 may be 7 mm, 7.2 mm, 7.4 mm, 7.6 mm, 7.8 mm, 8 mm, 8.2 mm, 8.4 mm, 8.6 mm, 8.8 mm, 9 mm, 9.2 mm, 9.4 mm, 9.6 mm, 9.8 mm, 10 mm or the like.

[0099] In some embodiments, 4 mm ≤ H1 ≤ 10 mm, and H1 can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm or the like.

[0100] In some embodiments, 10 mm ≤ H1 ≤ 15 mm, and H1 may be 10 mm, 10.2 mm, 10.4 mm, 10.6 mm, 10.8 mm, 11 mm, 11.2 mm, 11.4 mm, 11.6 mm, 11.8 mm, 12 mm, 12.2 mm, 12.4 mm, 12.6 mm, 12.8 mm, 13 mm, 13.2 mm, 13.4 mm, 13.6 mm, 13.8 mm, 14 mm, 14.2 mm, 14.4 mm, 14.6 mm, 14.8 mm, 15 mm or the like.

[0101] The width H2 of the connecting section 13 satisfies the following equation: 0.2 mm ≤ H2 ≤ 3 mm. In some embodiments, H2 may be 0.2 mm, 0.4 mm, 0.6 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or the like.

[0102] In some embodiments, 0.2 mm ≤ H2 ≤ 0.6 mm, and H2 may be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm or the like.

[0103] In some embodiments, 0.6 mm ≤ H2 ≤ 1 mm, and H2 can be 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm or the like.

[0104] In some embodiments, 1 mm ≤ H2 ≤ 3 mm, and H2 can be 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm or the like.

[0105] In the first direction X, the distance between the connecting section 13 and the edge of the solar cell 301 is greater than 0 and less than or equal to 1.5 mm. In some embodiments, the distance in the first direction between the connecting section 13 and the edge of the solar cell 301 can be 0.01 mm, 0.1 mm, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, or the like.

[0106] In one or more embodiments, if the distance between the connecting section 13 and the edge of the solar cell 301 is relatively large, the area of ​​the empty space of the photovoltaic module is relatively large, which impairs the output power of the photovoltaic module.

[0107] Therefore, the distance between the connection section 13 and the edge of the solar cell 301 is greater than 0 and less than or equal to 1.5 mm, which reduces the risk of the solar cell 301 being short-circuited by the contact between the connection section 13 and the solar cell 301, and also reduces the area ratio of the empty area on the photovoltaic module, thereby improving the output power of the photovoltaic module.

[0108] In some embodiments, the distance between the connecting section 13 and the edge of the solar cell 301 is greater than 0 and less than or equal to 0.4 mm. In the first direction X, the distance between the connecting section 13 and the edge of the solar cell 301 can be 0.01 mm, 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.1 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3 mm, 3.1 mm, 3.3 mm, 3.5 mm, 3.7 mm, 3.9 mm, 4 mm, or the like.

[0109] In some embodiments, the distance between the connecting section 13 and the edge of the solar cell 301 is between 0.4 mm and 1.5 mm. In the first direction X, the distance between the connecting section 13 and the edge of the solar cell 301 can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, or the like.

[0110] In the second direction Y, the length of the connecting section 13 can correspond to the length of the second busbar 12, i.e., one end of the connecting section 13 is aligned with one end of the second busbar 12.

[0111] Alternatively, shows Fig. 9 A top view of the connection structure between the second conductor rail 12 and the connection section 13 in the third direction Z. As in Fig. As shown in Figure 9, the length of the connecting section 13 is shorter than the length of the second busbar 12, thus reducing the risk of the connecting section 13 protruding from the second busbar 12 in the second direction Y. Therefore, a gap must be provided in the second direction Y between the end of the connecting section 13 and the end of the second busbar 12, and the size of the gap in the second direction Y is H3.

[0112] If the second busbar 12 is bent and routed out along the third direction Z and welded to the junction box, then: 20 mm ≤ H3 ≤ 50 mm. In some embodiments, H3 can be 20 mm, 30 mm, 40 mm, 50 mm, or the like.

[0113] In one or more embodiments, if H3 is relatively small, the bending size of the reserved second busbar 12 is relatively small, which increases the connection difficulty between the second busbar 12 and the junction box. If H3 is relatively large, the material costs of the second busbar 12 are relatively high. Therefore, 20 mm ≤ H3 ≤ 50 mm, which can reduce the connection difficulty between the second busbar 12 and the junction box and can also reduce the material costs of the second busbar 12.

[0114] In some embodiments, 20 mm ≤ H3 ≤ 35 mm, and H3 may be 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm or the like.

[0115] In some embodiments, 35 mm ≤ H3 ≤ 50 mm, and H3 may be 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm, 45 mm, 46 mm, 47 mm, 48 mm, 49 mm, 50 mm or the like.

[0116] If the second junction box 12 does not need to be welded to the junction box, then 0 mm ≤ H3 ≤ 5 mm. In some embodiments, H3 may be 0 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or the like.

[0117] In one or more embodiments, the material costs of the second busbar 12 are relatively high if H3 is relatively large. Therefore, 0 mm ≤ H3 ≤ 5 mm, which reduces the material costs of the second busbar 12.

[0118] In some embodiments, 0 mm ≤ H3 ≤ 2.5 mm, and H3 may be 0 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm or the like.

[0119] In some embodiments, 2.5 mm ≤ H3 ≤ 5 mm, and H3 may be 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, 5 mm or the like.

[0120] Fig. Figure 10 is a top view of a connection structure between a connection section 13 and an edge solder strip 3 in a third direction. As in Fig. As shown in Figure 10, the edge solder strip 3 comprises a first body 31 and a second body 32, which are arranged along the first direction X. The first body 31 is electrically connected to the solar cell 301 in Fig. 7 is connected, and the second body 32 is electrically connected to the connection section 13. In the second direction Y, the width of the second body 32 is greater than the width of the first body 31, so that the second body 32 has a larger contact area with the connection section 13, which improves the connection stability between the second body 32 and the connection section 13, improves the operational stability of the photovoltaic module, further reduces the contact resistance between the second body 32 and the connection section 13 and thus improves the output power of the photovoltaic module.

[0121] In the third direction Z, the thicknesses of the first body 31 and the second body 32 can be the same or different.

[0122] Fig. Figure 11 is a partial schematic structure diagram of an edge solder strip. As in Fig. As shown in Figure 11, in the third direction Z the thickness of the second body 32 is less than the thickness of the first body 31. In the processing process, the end of the edge solder strip 3 can be flattened to form the second body 32, thereby simplifying the processing of the edge solder strip 3, reducing the processing costs of the edge solder strip 3 and advantageously shortening the processing time of the edge solder strip 3.

[0123] The thickness of the second body 32 in the third direction Z, for example, is in the range of 0.1 mm to 0.15 mm, which could be 0.1 mm, 0.11 mm, 0.13 mm, 0.15 mm or the like.

[0124] If the thickness of the second body 32 is relatively small, its structural strength is also relatively low. Conversely, if the thickness of the second body 32 is relatively large, the contact area between the second body 32 and the connecting section 13 is relatively small. Therefore, in one or more embodiments, the thickness of the second body 32 in the third direction Z is in the range of 0.1 mm to 0.15 mm, which can improve the structural strength of the second body 32 and simultaneously increase the contact area between the second body 32 and the connecting section 13, thereby improving the operational stability of the photovoltaic module.

[0125] In some embodiments, the thickness of the second body 32 in the third direction Z is in the range of 0.1 mm to 0.13 mm, where it may be 0.1 mm, 0.105 mm, 0.11 mm, 0.115 mm, 0.12 mm, 0.125 mm, 0.13 mm or the like.

[0126] In some embodiments, the thickness of the second body 32 in the third direction Z is in the range of 0.13 mm to 0.15 mm, where it may be 0.13 mm, 0.135 mm, 0.14 mm, 0.145 mm, 0.15 mm or the like.

[0127] Fig. Figure 12 shows a sectional view of a connection structure between a second busbar and a solar cell string according to some embodiments. As in Fig. As shown in Figure 12, the photovoltaic module further comprises an insulating strip 5. In the third direction Z, the insulating strip 5 is located between the second busbar 12 and the solar cell 301, i.e., between the rear surface of the solar cell 301 and the second busbar 12, and between the solder strip 302 of the rear surface and the second busbar 12, which is insulated by the insulating strip 5. This reduces the risk of the solar cell 301 being short-circuited by the insulating strip 5 due to contact between the second busbar 12 and the solar cell 301, and thus improves the operational stability of the solar cell 301 and the photovoltaic module.

[0128] As in Fig. As shown in Figure 12, the insulating strip 5 extends in the first direction X to the outside of the solar cell 301 in the direction of the connection section 13, i.e. the insulating strip 5 protrudes in the first direction X beyond the edge of the solar cell 301, which further reduces the risk of a short circuit of the solar cell 301 caused by the contact between the second busbar 12 and the solar cell 301 and further improves the operational stability of the solar cell 301 and the photovoltaic module.

[0129] As in Fig. As shown in Figure 12, the insulating strip 5 is in contact with the connecting section 13 in the first direction X, thereby improving the insulating effect of the insulating strip 5.

[0130] Alternatively, in the first direction X a gap is provided between the insulating strip 5 and the connecting section 13, thereby reducing the risk of installation difficulties caused by interference between the connecting section 13 and the insulating strip 5, thus reducing the installation difficulties.

[0131] Fig. Figure 13 is a cross-sectional view of an insulating strip. As in Fig. As shown in Figure 13, the insulating strip 5 comprises at least a first layer body 51, a second layer body 52 and a third layer body 53. In the third direction Z, the second layer body 52 is located between the first layer body 51 and the third layer body 53.

[0132] In some embodiments, the first layer body 51 may consist of EVA, or be a three-layer co-extruded EVA-POE-EVA structure, or consist of polyolefin (PO).

[0133] In some embodiments, the second layer body 52 consists of PET.

[0134] In some embodiments, the third layer body 53 may consist of EVA, PO, or be a three-layer co-extruded EVA-POE-EVA structure.

[0135] In the second direction Y there is an insulating strip 5. Fig. Figure 14 is a bottom-side view of a connection structure between an insulating strip and a cell in an edge region according to some embodiments of the present disclosure, wherein the bottom-side view relates to a pattern obtained from the rear surface of the solar cell. As in Fig. As shown in Figure 14, all solar cells 301 arranged along the second direction Y are connected to the same insulating strip 5 in the edge area.

[0136] In the second direction Y there are a large number of insulating strips 5. Fig. Figure 15 is a bottom-side view of a connection structure between an insulating strip and a cell in an edge region according to some embodiments of the present disclosure. As in Fig. As shown in Figure 15, in the second direction Y there is a plurality of insulating strips 5 which are in a one-to-one correspondence to the solar cell string groups, i.e. the insulating strips 5 are in a one-to-one correspondence to the solar cells 301 in the edge region.

[0137] In the second direction Y there are a large number of insulating strips 5. Fig. Figure 16 shows a bottom-side view of a connection structure between an insulating strip and a cell in an edge region according to some embodiments of the present disclosure. As in Fig. As shown in Figure 16, there is a plurality of insulating strips 5 in the second direction Y. One of the insulating strips 5 is connected to at least two of the solar cell string groups, i.e., at least two of the solar cells 301 arranged along the second direction Y are connected in the edge region to the same insulating strip 5.

[0138] The thickness of the insulating strip 5 in the third direction Z, for example, is in the range of 0.1 mm to 0.8 mm, which could be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm or the like.

[0139] In some embodiments, the thickness of the insulating strip 5 in the third direction Z is in the range of 0.1 mm to 0.5 mm, where it may be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm or the like.

[0140] In some embodiments, the thickness of the insulating strip 5 in the third direction Z is in the range of 0.5 mm to 0.8 mm, where it may be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm or the like.

[0141] In the first direction X, the width of the insulating strip 5, for example, is in the range of 6 mm to 30 mm, which could be 6 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm or the like.

[0142] In some embodiments, the width of the insulating strip 5 is in the range of 6 mm to 10 mm, and may be 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm or the like.

[0143] In some embodiments, the width of the insulating strip 5 is in the range of 10 mm to 20 mm, and may be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm or the like.

[0144] In some embodiments, the width of the insulating strip 5 is in the range of 20 mm to 30 mm, which may be 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm or the like.

[0145] Based on the above structure, the edge solder strip 3 is located on the light-receiving surface of the solar cell 301 or the edge solder strip 3 is located on the rear surface of the solar cell 301.

[0146] Fig. Figure 17 is a cross-sectional view of a connection structure between a second busbar and a solar cell string according to some embodiments. As in Fig. As shown in Figure 17, when the second busbar 12 is located on the rear surface of the solar cell 301 and the edge solder strip 3 is located on the light-receiving surface of the solar cell 301, the distance in the third direction Z between the light-receiving surface of the first body 31 and the rear surface of the solar cell 301 is equal to L1, the distance between the light-receiving surface of the second busbar 12 and the rear surface of the solar cell 301 is equal to L2, and the thickness of the connecting section 13 is equal to L3, where L2 ≤ L3 < L1 or L2 < L3 ≤ L1, allowing the connecting section 13 to be connected to the edge solder strip 3 on the light-receiving surface and thus reducing the risk of the connecting section 13 lifting the edge solder strip 3 to form a local protrusion due to a relatively large height of the connecting section 13.and thus reduces the risk of damage to the laminate at the local protrusion during the lamination process.

[0147] Fig. Figure 18 is a cross-sectional view of a connection structure between a second busbar and a solar cell string according to some embodiments. As in Fig. As shown in Figure 18, when the second busbar 12 is located on the rear surface of the solar cell 301 and the edge solder strip 3 is located on the rear surface of the solar cell 301, the distance in the third direction Z between the light-receiving surface of the first body 31 and the light-receiving surface of the second busbar 12 is equal to L4, the distance between the rear surface of the first body 31 and the light-receiving surface of the second busbar 12 is equal to L5, and the thickness of the connecting section 13 is equal to L6, where L5 ≤ L6 < L4 or L5 < L6 ≤ L4, which allows the connecting section 13 to be connected to the edge solder strip 3 on the rear surface while also reducing the risk of the connecting section 13 lifting the edge solder strip 3 to form a local protrusion due to a relatively large height of the connecting section 13.and thus reduces the risk of damage to the laminate at the local protrusion during the lamination process.

[0148] In the third direction Z, the thickness of the second busbar 12, for example, is in the range of 0.05 mm to 0.4 mm, which could be 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm or the like.

[0149] In some embodiments, the thickness of the second busbar 12 is in the range of 0.05 mm to 0.1 mm, which may be 0.05 mm, 0.055 mm, 0.06 mm, 0.065 mm, 0.07 mm, 0.075 mm, 0.08 mm, 0.085 mm, 0.09 mm, 0.095 mm, 0.1 mm or the like.

[0150] In some embodiments, the thickness of the second busbar 12 is in the range of 0.1 mm to 0.2 mm, which may be 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm or the like.

[0151] In some embodiments, the thickness of the second busbar 12 is in the range of 0.2 mm to 0.4 mm, being 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.3 mm, 0.32 mm, 0.34 mm, 0.36 mm, 0.38 mm, 0.4 mm or the like.

[0152] In the third direction Z, the thickness of the connecting section 13, for example, is in the range of 0.2 mm to 0.6 mm, where it can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm or the like.

[0153] In some embodiments, the thickness of the connecting section 13 is in the range of 0.2 mm to 0.4 mm, which may be 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.3 mm, 0.32 mm, 0.34 mm, 0.36 mm, 0.38 mm, 0.4 mm or the like.

[0154] In some embodiments, the thickness of the connecting section 13 is in the range of 0.4 mm to 0.6 mm, being 0.4 mm, 0.42 mm, 0.44 mm, 0.46 mm, 0.48 mm, 0.5 mm, 0.52 mm, 0.54 mm, 0.56 mm, 0.58 mm, 0.6 mm or the like.

[0155] Based on the above structure of the boundary region, a second aspect of one or more embodiments of the present disclosure provides a teaching for the manufacture (or formation) of the photovoltaic module. Fig. 19 is a flowchart of a method for manufacturing a photovoltaic module according to several embodiments. As in Fig. As shown in Figure 19, the instruction for manufacturing the photovoltaic module comprises the following steps. A1: The solar cell string group 305 is formed. A2: A large number of solar cell string groups 305 are arranged along the second direction Y. A3: The connecting section 13 is arranged in the first direction X on one or both sides of the solar cell string group 305. The connecting section 13 extends along the second direction Y and is located in the third direction Z on the rear surface of the solar cell string group 305. A4: The connecting section 13 is attached by soldering to the solder strip 302 on the solar cell string group 305. A5: The encapsulation layer 20 and the cover plate 10 are placed on a light-receiving surface and the rear surface of the solar cell string assembly 305 and then laminated and fastened to form a laminate. A6: A frame is mounted on one edge of the laminate to form a photovoltaic module.

[0156] Before or after step A3, the teaching for the manufacture of the photovoltaic module further includes the following steps.

[0157] A7: The connecting section 13 is attached to the second busbar 12 by soldering.

[0158] In one or more embodiments, the second busbar 12 is located on the rear surface of the solar cell 301, such that part of the structure of the second busbar 12 is shielded by the solar cell 301. Without adjusting the dimensions of the solar cell 301 or the second busbar 12 in the first direction X, the overall size of the second busbar 12 and the solar cell string 303 in the first direction X can be reduced, thereby reducing the space required for the second busbar 12 and the solar cell string 303. This allows for the arrangement of additional solar cells 301 within a limited space, thus improving the ratio of effective area to the body area of ​​the photovoltaic module and increasing the output power of the photovoltaic module.

[0159] Fig. Figure 19 shows step A7 after step A4 and before step A5.

[0160] Fig. Figure 20 is a flowchart of a teaching for the manufacture of a photovoltaic module according to some embodiments. Fig. Figure 20 shows step A7 before step A3.

[0161] Fig. Figure 21 is a flowchart of some steps in a teaching for the manufacture of a photovoltaic module according to some embodiments. As in Fig. As shown in Figure 21, the teaching for the manufacture of the photovoltaic module comprises the following steps prior to step A1.

[0162] A01: The end of the edge solder strip 3 is flattened to form the second body 32.

[0163] Based on step A01, step A4 includes the following steps.

[0164] A41: The connecting section 13 is attached to the second body 32 by soldering.

[0165] In one or more embodiments, the end of the edge solder strip 3 is flattened to form the second body 32, so that the second body 32 has a larger contact area with the connection section 13, thereby improving the connection stability between the second body 32 and the connection section 13 and thus further improving the operational stability of the photovoltaic module.

[0166] Fig. Figure 22 is a schematic structural diagram of a solar cell string assembly according to some embodiments. As in Fig. As shown in Figure 22, the solder strip 302 extends at one end of the solar cell string 303 to the outside of the solar cell 301, and the solder strip 302 of the adjacent solar cell string 303 can be directly attached by soldering.

[0167] Based on the in Fig. The structure shown in 22 is Fig. 23 A flowchart of step A1 in some embodiments. As in Fig. As shown in 23, step A1 comprises the following steps.

[0168] A11: The multiple cells 301 are arranged along the first direction X.

[0169] A12: The solder strip 302 is placed on the solar cell 301 and attached to the solar cell 301 by soldering to form the solar cell string 303.

[0170] A13: At least two solar cell strings 303 are arranged along the first direction X.

[0171] A14: The solder strips 302 of the adjacent solar cell strings 303 are attached by soldering to form the solar cell string group 305.

[0172] In the third direction Z, the projections of the solder strips 302 of the adjacent solar cell strings 303 may or may not have overlapping sections.

[0173] Fig. Figure 24 is a schematic structural diagram of a solar cell string assembly according to some embodiments. As in Fig. As shown in Figure 3, the solder strip 302 comprises a first solder strip 3021 and a second solder strip 3022. In one of the solar cell strings 303, the first solder strip 3021 is configured to connect adjacent solar cells 301, and the second solder strip 3022 is configured to connect adjacent solar cell strings 303.

[0174] Based on the in Fig. The structure shown in section 24 is Fig. 25 A flowchart of step A1 in some embodiments. As in Fig. As shown in 25, step A1 comprises the following steps.

[0175] A15: The multiple cells 301 are arranged along the first direction X.

[0176] A16: The first solder strip 3021 is placed on the solar cell 301 and attached to the solar cell 301 by soldering to form the solar cell string 303.

[0177] A17: At least two solar cell strings 303 are arranged along the first direction X.

[0178] A18: Two ends of the second solder strip 3022 are each placed on adjacent solar cell strings 303 and attached by soldering to form the solar cell string group 305 in the first direction X.

[0179] If the rear surface of solar cell 301 is provided with the insulating strip 5, the insulating strip 5 can first be attached to solar cell string assembly 303, and then the solar cell string assemblies 303 can be welded together to form solar cell string assembly 305. Alternatively, the solar cell strings 303 can first be welded together to form solar cell string assembly 305, and then the insulating strip 5 can be attached to solar cell string assembly 305.

[0180] Using the example of the in Fig. The process shown in step 25 is Fig. 26 A flow diagram of the connection between an insulating strip and a solar cell string assembly according to some embodiments. As in Fig. As shown in Figure 26, the teaching for the formation of the photovoltaic module after step A16 and before step A17 further includes the following steps.

[0181] A02: The insulating strip 5 is placed on the solar cell string 303, and in the third direction Z the insulating strip 5 is located on the rear surface of the solar cell 301.

[0182] A03: The insulating strip 5 is attached to the solar cell string 303 by spot gluing.

[0183] For example, Fig. 25 a process that in Fig. Figure 27 is shown as a flowchart of the connection between an insulating strip and a solar cell string assembly according to some embodiments. As shown in Fig. As shown in Figure 27, the teaching for the manufacture of the photovoltaic module after step A1 and before step A4 further comprises the following steps.

[0184] A04: The insulating strip 5 is placed on the solar cell string group 305, and in the third direction Z the insulating strip 5 is located on the rear surface of the solar cell 301.

[0185] A05: The insulating strip 5 is attached to the solar cell string group 305 by spot gluing.

[0186] Furthermore, the insulating rail 5 can first be rigidly connected to the second busbar 12, and then the insulating rail 5 is attached to the solar cell string assembly by spot bonding. The fastening sequence of the insulating rail 5 is not particularly restricted in one or more embodiments of the present disclosure.

[0187] Steps A03 and A05 may include specific spot bonding steps: performing hot air blowing and pressing on the insulating strip 5 to allow the insulating strip 5 to be attached to the solar cell 301.

[0188] Alternatively, specific steps for spot bonding can be: irradiating the insulating strip 5 with infrared lamps to enable the attachment of the insulating strip 5 to the solar cell 301.

[0189] The specific steps of spot gluing are not particularly limited in one or more embodiments of the present disclosure.

[0190] In summary, in the teaching for forming the photovoltaic module provided in one or more embodiments of the present disclosure, the connecting section 13 can first be attached to the solar cell string assembly 305 and then the second busbar 12 can be rigidly connected to the connecting section 13. Alternatively, the connecting section 13 and the second busbar 12 can be rigidly connected to each other as a whole, and then the whole assembly is attached to the solar cell string assembly 305.

[0191] The insulating strip 5 can first be attached to the solar cell string group 303. The solar cell strings 303 are then connected together to form the solar cell string group 305. Alternatively, the solar cell strings 303 can first be connected together to form the solar cell string group 305, and then the insulating strip 5 is attached to the solar cell string group 305.

[0192] In some embodiments, in which the solar cell strings 303 are first connected to form a solar cell string group 305 and then the connecting section 13, the second busbar 12 and the insulating strip 5 are attached to the solar cell string group 305, the following two steps are provided.

[0193] First, the insulating strip 5 is attached to the solar cell string group 305, and then the connecting section 13 and the second busbar 12 are attached to the solar cell string group.

[0194] Secondly, the connecting section 13, the second busbar 12 and the insulating strip 5 are connected together as a whole, and then the whole is attached to the solar cell string group 305.

[0195] The connection structure of the edge area is explained in more detail below.

[0196] As in Fig. 3 and Fig. As shown in Figure 5, the busbar 304 includes an intermediate connecting strip 2 located in the first direction X between adjacent solar cell strings 303. The solder strip 302 includes an electrical connector 4. The two ends of the electrical connector 4 are each electrically connected to the solar cells 301 on the adjacent solar cell strings 303, such that the adjacent solar cell strings 303 are connected in series or parallel to form a solar cell string group 305. The plurality of solar cell string groups 305 are arranged along the second direction Y. In the second direction Y, at least two solar cell string groups 305 are electrically connected to the same intermediate connecting strip 2, such that the adjacent solar cell string groups 305 are connected in series or parallel.

[0197] Fig. Figure 28 shows a sectional view of a connection structure between the intermediate connecting strip and the solar cell string in the relevant prior art. As in Fig. As shown in Figure 28, the intermediate connecting strip 2 is referred to as the first intermediate connecting strip 21 in the relevant prior art. A relatively large second gap 211 is provided between the first intermediate connecting strip 21 and the adjacent cell 301 in the first direction X. In the first direction X, the size of the second gap 211 must be larger than the size of the first intermediate connecting strip 21, so that a projection of the first intermediate connecting strip 21 can lie completely within the second gap 211.

[0198] The second gap 211 leads to a relatively large arrangement space for the first intermediate connecting strip 21 and the solar cell strings 303. Within the limited space, it is necessary to reduce the number of solar cell strings 303 in order to create the arrangement space required for the first intermediate connecting strip 21, which in turn affects the output power of the photovoltaic module.

[0199] In order to reduce the space required for the connecting strip 2 and the solar cell string 303 in this context, shows Fig. 29 A sectional view of a connection structure between the intermediate connecting strip and the solar cell string according to some embodiments of the present disclosure. As in Fig. As shown in Figure 29, the intermediate connecting strip 2 is referred to as the second intermediate connecting strip 22 in one or more embodiments of the present disclosure, and the busbar 304 further comprises an intermediate connecting section 23. In the third direction Z, the intermediate connecting section 23 is located on a side of the second intermediate connecting strip 22 that faces the solar cell 301.In the first direction X, at least part of a structure of the intermediate connection section 23 is located between two adjacent solar cell strings 303, and the second intermediate connection strip 22 is electrically connected to the electrical connector 4 via the intermediate connection section 23, so that adjacent solar cell strings 303 in the first direction X are electrically connected to each other via the second intermediate connection strip 22 and adjacent solar cell string groups 305 in the second direction Y are electrically connected to each other via the second intermediate connection strip 22.

[0200] The second interconnect strip 22 is located on the rear surface of the solar cell string group 305, i.e., in the third direction Z, part of the structure of the second interconnect strip 22 is located on the rear surface of the solar cell 301, so that the projection of the second interconnect strip 22 in the third direction Z partially overlaps with the projection of the solar cell 301 in the third direction Z.

[0201] In one or more embodiments, the second connecting strip 22 is located on the rear surface of the solar cell 301, such that part of the structure of the second connecting strip 22 is shielded by the solar cell 301. Without adjusting the dimensions of the solar cell 301 or the second connecting strip 22 in the first direction X, the overall size of the second connecting strip 22 and the solar cell string 303 in the first direction X can be reduced, thereby reducing the space required for the arrangement of the second connecting strip 22 and the solar cell string 303. This allows for the arrangement of additional solar cells 301 within a limited space, thus improving the ratio of effective area to the body area of ​​the photovoltaic module and increasing the output power of the photovoltaic module.

[0202] Based on the in Fig. According to the relevant prior art shown in Figure 28, the first intermediate connecting strip 21, when arranged on the rear surface of the solar cell 301, must be folded, the folded structure being in Fig. Figure 30 is shown. Subsequently, part of the structure of the electrical connector 4, together with the first intermediate connecting strip 21, is folded onto the rear surface of the solar cell 301. At the first intermediate connecting strip 21, the total thickness of the solar cell layer 30 results from the thickness of the electrical connector 4 facing the light-receiving area, the thickness of the solar cell 301, the thickness of the first intermediate connecting strip 21, and the thickness of the electrical connector 4 facing the light-receiving area. This locally increases the thickness of the solar cell layer 30, leading to a relatively high risk of hidden cracks occurring during the subsequent lamination process. Furthermore, folding the electrical connector 4 can cause it to break and become damaged, and it can also increase the risk of cracks in the solder joints.

[0203] Therefore, as in Fig. 29 shows that in one or more embodiments the second intermediate connecting strip 22 and the electrical connector 4 are electrically connected via the intermediate connecting section 23 extending in the third direction Z, thus reducing the risk of breakage damage and cracks at the solder joints of the electrical connector 4 caused by bending, as well as the risk of hidden cracks that occur during the lamination process due to the local increase in thickness of the solar cell layer 30, thereby improving the process yield and the operational stability of the photovoltaic module.

[0204] As in Fig. As shown in Figure 7, in the first direction X, the distance by which the edge solder strip 3 extends beyond the edge of the solar cell 301 is equal to H0, where 1 mm ≤ H0 ≤ 5 mm. In some embodiments, H0 is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, or the like.

[0205] If the distance by which the edge solder strip 3 extends beyond the edge of the solar cell 301 is relatively large, the size of the solar cell layer in the first direction X is relatively large, while the area ratio of the actual solar cell 301 is relatively small, which impairs the output power of the photovoltaic module.

[0206] If the distance between the edge solder strip 3 and the connection section 13 is small, it is difficult to connect the edge solder strip 3 and the connection section 13, and there is a risk of a small connection dimension between the edge solder strip 3 and the connection section 13 as well as poor connection stability.

[0207] Therefore, 1 mm ≤ H0 ≤ 5 mm, which can improve the ratio of the area of ​​the solar cell 301 to the total area of ​​the solar cell layer and can also improve the connection stability between the edge solder strip 3 and the connection section 13, thereby improving the output power of the photovoltaic module.

[0208] In some embodiments, 1 mm ≤ H0 ≤ 2.5 mm, and the distance by which the edge solder strip 3 extends beyond the edge of the solar cell 301 is 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm or the like.

[0209] In some embodiments, 2.5 mm ≤ H0 ≤ 5 mm, and the distance by which the edge solder strip 3 extends beyond the edge of the solar cell 301 is 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, 5 mm or the like.

[0210] The second intermediate connecting strip 22 and the intermediate connecting section 23 can be formed in one piece to simplify the connection difficulties and reduce the connection time.

[0211] Alternatively, the second intermediate connecting strip 22 and the intermediate connecting section 23 are separate structures, and the second intermediate connecting strip 22 and the intermediate connecting section 23 are firmly joined together by soldering or thermocompression fixing, thus reducing the machining effort for the second intermediate connecting strip 22 and the intermediate connecting section 23 and thereby shortening the machining time. In this case, the intermediate connecting section 23 can be a solder strip, and its cross-sectional shape can be circular or rectangular; that is, the intermediate connecting section 23 can be a circular solder strip or a flat solder strip.

[0212] The intermediate connection section 23 and the electrical connector 4 are firmly connected to each other by soldering or thermocompression fixing, so that the processing effort for the intermediate connection section 23 and the electrical connector 4 is reduced and the processing time is shortened.

[0213] As in Fig. As shown in Figure 29, the solar cell string group 305 comprises at least a first solar cell string 3031 and a second solar cell string 3032, which are arranged along a first direction X. The first solar cell string 3031 comprises a first end solar cell 3011. The second solar cell string 3032 comprises a second end solar cell 3012. In the first direction X, the first end solar cell 3011 is adjacent to the second end solar cell 3012.

[0214] In the third direction Z, a projection of the second intermediate connecting strip 22 partially overlaps with a projection of the first end solar cell 3011 and / or a projection of the second intermediate connecting strip 22 partially overlaps with a projection of the second end solar cell 3012.

[0215] In some embodiments, in the third direction Z, the projection of the second intermediate connecting strip 22 partially overlaps with the projection of the first end solar cell 3011, wherein the projection of the second intermediate connecting strip 22 does not overlap with the projection of the second end solar cell 3012.

[0216] In some embodiments, the projection of the second intermediate connecting strip 22 in the third direction Z does not partially overlap with the projection of the first end solar cell 3011, while the projection of the second intermediate connecting strip 22 overlaps with the projection of the second end solar cell 3012.

[0217] In some embodiments, in the third direction Z, the projection of the second intermediate connecting strip 22 partially overlaps with the projection of the first end solar cell 3011, and the projection of the second intermediate connecting strip 22 partially overlaps with the projection of the second end solar cell 3012.

[0218] In one or more embodiments, the projection of the second connecting strip 22 partially overlaps with the projection of the first end solar cell 3011, and the projection of the second connecting strip 22 partially overlaps with the projection of the second end solar cell 3012, thereby further reducing the distance between adjacent solar cell strings 303 in the first direction X, further increasing the number of solar cells 301 that can be arranged, and thus improving the output power of the photovoltaic module.

[0219] As in Fig. As shown in Figure 29, in the third direction Z, a geometric center of the second intermediate connecting strip 22 is located within a projection area of ​​the intermediate connecting section 23, i.e., the intermediate connecting section 23 is arranged at a midpoint of the second intermediate connecting strip 22, so that the distances between the intermediate connecting section 23 and the solar cells 301 on both sides are equal or similar, thereby improving the uniformity of the arrangement of the solar cell strings 303 in the first direction X.

[0220] As in Fig. As shown in Figure 29, a gap is provided in the first direction X between the intermediate connection section 23 and the solar cell 301, thereby reducing the risk of a short circuit of the solar cell 301 caused by direct contact between the intermediate connection section 23 and the solar cell 301.

[0221] As in Fig. As shown in Figure 29, in the first direction X, the width of the second intermediate connecting strip 22 is equal to H4, the width of the intermediate connecting section 23 is equal to H5, and 1.3 < H4 / H5 ≤ 75. In some embodiments, H4 / H5 can be 1.31, 1.5, 1.7, 2, 2.7, 3, 3.7, 4, 4.7, 5, 5.7, 6, 6.7, 7, 7.7, 8, 8.7, 9, 9.7, 10, 10.7, 11, 11.7, 12, 12.7, 13, 13.7, 14, 14.7, 15, 15.7, 16, 16.6, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75 or something similar.

[0222] If H4 / H5 is relatively small, the width difference between the second intermediate connecting strip 22 and the intermediate connecting section 23 is relatively small, and the contact between the intermediate connecting section 23 and the solar cell 301 leads to a relatively high risk of a short circuit of the solar cell 301.

[0223] If H4 / H5 is relatively large, the width of the second intermediate connecting strip 22 is relatively large, resulting in relatively high material costs for the second intermediate connecting strip 22. Alternatively, the width of the intermediate connecting section 23 is relatively small, resulting in a relatively low current transmission capacity of the intermediate connecting section 23 and also relatively poor connection stability between the intermediate connecting section 23 and the electrical connector 4.

[0224] Therefore, in one or more embodiments, 1.3 < H4 / H5 ≤ 75, whereby the width difference between the second intermediate connection strip 22 and the intermediate connection section 23 can be increased, thereby reducing the risk of a short circuit of the solar cell 301 caused by contact between the intermediate connection section 23 and the solar cell 301. Furthermore, the width of the second intermediate connection strip 22 can be reduced, the material costs of the second intermediate connection strip 22 can be lowered, and the width of the intermediate connection section 23 can be increased, thereby improving the current transmission capacity of the intermediate connection section 23 and the connection stability between the intermediate connection section 23 and the electrical connector 4, and thus increasing the output power and operational stability of the photovoltaic module.

[0225] In some embodiments, 1.3 < H4 / H5 ≤ 1.7, and H4 / H5 may be 1.31, 1.33, 1.35, 1.37, 1.39, 1.4, 1.41, 1.43, 1.45, 1.47, 1.49, 1.5, 1.51, 1.53, 1.55, 1.57, 1.59, 1.6, 1.61, 1.63, 1.65, 1.67, 1.69, 1.7 or the like.

[0226] In some embodiments, 1.7 ≤ H4 / H5 ≤ 10.7, and H4 / H5 can be 1.7, 1.71, 1.75, 2, 2.5, 2.7, 3, 3.5, 3.7, 4, 4.5, 4.7, 5, 5.5, 5.7, 6, 6.5, 6.7, 7, 7.5, 7.7, 8, 8.5, 8.7, 9, 9.5, 9.7, 10, 10.5, 10.7 or the like.

[0227] In some embodiments, 10.7 ≤ H4 / H5 ≤ 16.7, and H4 / H5 can be 10.7, 10.71, 10.75, 11, 11.3, 11.5, 11.7, 11.9, 12, 12.1, 12.3, 12.5, 12.7, 12.9, 13, 13.1, 13.3, 13.5, 13.7, 13.9, 14, 14.1, 14.3, 14.5, 14.7, 14.9, 15, 15.1, 15.3, 15.5, 15.7, 15.9, 16, 16.1, 16.3, 16.5, 16.6, 16.69 or the like.

[0228] In some embodiments, 1.3 < H1 / H2 < 16.7, and H1 / H2 may be 1.31, 1.5, 1.7, 2, 2.7, 3, 3.7, 4, 4.7, 5, 5.7, 6, 6.7, 7, 7.7, 8, 8.7, 9, 9.7, 10, 10.7, 11, 11.7, 12, 12.7, 13, 13.7, 14, 14.7, 15, 15.7, 16, 16.6 or the like.

[0229] In some embodiments, 16.7 ≤ H1 / H2 ≤ 20, and H1 / H2 can be 16.7, 16.8, 16.9, 17, 17.2, 17.4, 17.6, 17.8, 18, 18.2, 18.4, 18.6, 18.8, 19, 19.2, 19.4, 19.6, 19.8, 20 or the like.

[0230] In some embodiments, 20 ≤ H1 / H2 ≤ 55, and H1 / H2 can be 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50 or the like.

[0231] In some embodiments, 55 ≤ H1 / H2 ≤ 75, and H1 / H2 can be 55, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 75 or the like.

[0232] The width H4 of the second intermediate connecting strip 22 satisfies the following relationship: 4 mm ≤ H4 ≤ 15 mm. In some embodiments, H4 may be equal to 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm or the like.

[0233] In some embodiments, 4 mm ≤ H4 ≤ 7 mm, and H4 may be 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm, 5.2 mm, 5.4 mm, 5.6 mm, 5.8 mm, 6 mm, 6.2 mm, 6.4 mm, 6.6 mm, 6.8 mm, 7 mm or the like.

[0234] In some embodiments, 7 mm ≤ H4 ≤ 10 mm, and H4 may be 7 mm, 7.2 mm, 7.4 mm, 7.6 mm, 7.8 mm, 8 mm, 8.2 mm, 8.4 mm, 8.6 mm, 8.8 mm, 9 mm, 9.2 mm, 9.4 mm, 9.6 mm, 9.8 mm, 10 mm or the like.

[0235] In some embodiments, 4 mm ≤ H4 ≤ 10 mm, and H4 may be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm or the like.

[0236] In some embodiments, 10 mm ≤ H4 ≤ 15 mm, and H4 may be 10 mm, 10.2 mm, 10.4 mm, 10.6 mm, 10.8 mm, 11 mm, 11.2 mm, 11.4 mm, 11.6 mm, 11.8 mm, 12 mm, 12.2 mm, 12.4 mm, 12.6 mm, 12.8 mm, 13 mm, 13.2 mm, 13.4 mm, 13.6 mm, 13.8 mm, 14 mm, 14.2 mm, 14.4 mm, 14.6 mm, 14.8 mm, 15 mm or the like.

[0237] The width H5 of the intermediate connecting section 23 satisfies the following relationship: 0.2 mm ≤ H5 ≤ 3 mm. In some embodiments, H5 may be 0.2 mm, 0.4 mm, 0.6 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or the like.

[0238] In some embodiments, 0.2 mm ≤ H5 ≤ 0.6 mm, and H5 may be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm or the like.

[0239] In some embodiments, 0.6 mm ≤ H5 ≤ 1 mm, and H5 can be 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm or the like.

[0240] In some embodiments, 1 mm ≤ H5 ≤ 3 mm, and H5 may be 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm or the like.

[0241] In the first direction X, the distance between the connecting section 13 and the edge of the solar cell 301 is greater than 0 and less than or equal to 1.5 mm. In some embodiments, the distance in the first direction between the intermediate connecting section 23 and the edge of the solar cell 301 can be 0.01 mm, 0.1 mm, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, or the like.

[0242] In one or more embodiments, if the distance between the intermediate connection section 23 and the edge of the solar cell 301 is relatively large, the area of ​​the empty space of the photovoltaic module is relatively large, which impairs the output power of the photovoltaic module.

[0243] Therefore, the distance between the intermediate connection section 23 and the edge of the solar cell 301 is greater than 0, and the distance between the intermediate connection section 23 and the edge of the solar cell 301 is less than or equal to 1.5 mm, which reduces the risk of a short circuit of the solar cell 301 by the intermediate connection section 23 caused by contact between the intermediate connection section 23 and the solar cell 301, and also reduces the area ratio of the empty area on the photovoltaic module, thereby improving the output power of the photovoltaic module.

[0244] In some embodiments, the distance between the connecting section 23 and the edge of the solar cell 301 is greater than 0 and less than or equal to 0.4 mm. In the first direction X, the distance between the connecting section 23 and the edge of the solar cell 301 can be 0.01 mm, 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.1 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3 mm, 3.1 mm, 3.3 mm, 3.5 mm, 3.7 mm, 3.9 mm, 4 mm, or the like.

[0245] In some embodiments, the distance between the connecting section 23 and the edge of the solar cell 301 is between 0.4 mm and 1.5 mm. In the first direction X, the distance between the connecting section 23 and the edge of the solar cell 301 can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, or the like.

[0246] In the second direction Y, the length of the intermediate connecting section 23 can correspond to the length of the second intermediate connecting strip 22, i.e., one end of the intermediate connecting section 23 is aligned with one end of the second intermediate connecting strip 22.

[0247] Alternatively, shows Fig. 31 A top view of a connecting structure between a second intermediate connecting strip and an intermediate connecting section in a third direction. As in Fig. As shown in Figure 31, the length of the intermediate connecting section 23 is smaller than the length of the second intermediate connecting strip 22, thus reducing the risk of the intermediate connecting section 23 protruding from the second intermediate connecting strip 22 in the second direction Y. Therefore, a gap must be provided in the second direction Y between the end of the intermediate connecting section 23 and the end of the second intermediate connecting strip 22, and the size of the gap in the second direction Y is H6.

[0248] If the second intermediate connecting strip 22 is bent and led out along the third direction Z and welded to the junction box, then 20 mm ≤ H6 ≤ 50 mm. In some embodiments, H6 may be 20 mm, 30 mm, 40 mm, 50 mm, or the like.

[0249] In one or more embodiments, if H6 is relatively small, the bending dimension of the reserved second intermediate connecting strip 22 is relatively small, which increases the connection difficulty between the second intermediate connecting strip 22 and the junction box. If H6 is relatively large, the material costs of the second intermediate connecting strip 22 are relatively high. Therefore, 20 mm ≤ H6 ≤ 50 mm, which reduces the connection difficulty between the second intermediate connecting strip 22 and the junction box and also reduces the material costs of the second intermediate connecting strip 22.

[0250] In some embodiments, 20 mm ≤ H6 ≤ 35 mm, and H6 may be 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm or the like.

[0251] In some embodiments, 35 mm ≤ H6 ≤ 50 mm, and H6 may be 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm, 45 mm, 46 mm, 47 mm, 48 mm, 49 mm, 50 mm or the like.

[0252] If the second intermediate connecting strip 22 does not need to be welded to the junction box, then 0 mm ≤ H6 ≤ 5 mm. In some embodiments, H6 may be 0 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or the like.

[0253] In one or more embodiments, the material costs of the second connecting strip 22 are relatively high when H6 is relatively large. Therefore, the material costs of the second connecting strip 22 can be reduced when 0 mm ≤ H6 ≤ 5 mm.

[0254] In some embodiments, 0 mm ≤ H6 ≤ 2.5 mm, and H6 may be 0 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm or the like.

[0255] In some embodiments, 2.5 mm ≤ H6 ≤ 5 mm, and H6 may be 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, 5 mm or the like.

[0256] Fig. Figure 32 is a top view of a connection structure between an intermediate connection section and an electrical connector in a third direction. As in Fig. As shown in Figure 32, the electrical connector 4 comprises an electrical connecting body 41 and an electrical connecting section 42. The electrical connecting body 41 comprises a first electrical connecting body 411 and a second electrical connecting body 412. In the first direction X, the electrical connecting section 42 is located between the first electrical connecting body 411 and the second electrical connecting body 412, wherein the first electrical connecting body 411 and the second electrical connecting body 412 are each electrically connected to adjacent solar cell strings 303, and the electrical connecting section 42 is electrically connected to the intermediate connecting section 23.

[0257] In the second direction Y, the width of the electrical connection section 42 is greater than the width of the first electrical connection body 411, and the width of the electrical connection section 42 is greater than the width of the second electrical connection body 412, resulting in a larger contact area between the electrical connection section 42 and the intermediate connection section 23, thereby improving the connection stability between the electrical connection section 42 and the intermediate connection section 23, further improving the operational stability of the photovoltaic module, and reducing the contact resistance between the electrical connection section 42 and the intermediate connection section 23, thereby improving the output power of the photovoltaic module.

[0258] In the third direction Z, the thicknesses of the electrical connection section 42 and the first electrical connection body 411 can be the same or different, and the thicknesses of the electrical connection section 42 and the second electrical connection body 412 can be the same or different.

[0259] Fig. Figure 33 is a partial schematic structure diagram of an electrical connector. As in Fig. As shown in Figure 33, in the third direction Z, the thickness of the electrical connection section 42 is less than the thickness of the first electrical connection body 411, and the thickness of the electrical connection section 42 is less than the thickness of the second electrical connection body 412. In the manufacturing process, the intermediate section of the electrical connector 4 can be flattened to form the second body 32, thereby simplifying the machining of the edge solder strip 3, reducing the manufacturing cost of the edge solder strip 3, and shortening the machining time of the edge solder strip 3.

[0260] The thickness of the electrical connection section 42 in the third direction Z, for example, is in the range of 0.1 mm to 0.15 mm, which could be 0.1 mm, 0.11 mm, 0.13 mm, 0.15 mm or the like.

[0261] If the thickness of the electrical connection section 42 is relatively small, its structural strength is also relatively low. Conversely, if the thickness of the electrical connection section 42 is relatively large, the contact area between the electrical connection section 42 and the intermediate connection section 23 is relatively small. Therefore, in one or more embodiments, the thickness of the electrical connection section 42 in the third direction Z is in the range of 0.1 mm to 0.15 mm, which can improve the structural strength of the electrical connection section 42 and simultaneously increase the contact area between the electrical connection section 42 and the intermediate connection section 23, thereby improving the operational stability of the photovoltaic module.

[0262] In some embodiments, the thickness of the electrical connection section 42 in the third direction Z is in the range of 0.1 mm to 0.13 mm, where it may be 0.1 mm, 0.105 mm, 0.11 mm, 0.115 mm, 0.12 mm, 0.125 mm, 0.13 mm or the like.

[0263] In some embodiments, the thickness of the electrical connection section 42 in the third direction Z is in the range of 0.13 mm to 0.15 mm, where it may be 0.13 mm, 0.135 mm, 0.14 mm, 0.145 mm, 0.15 mm or the like.

[0264] The first electrical connecting body 411, the electrical connecting section 42 and the second electrical connecting body 412 can be split structures or integrally formed structures.

[0265] As in Fig. As shown in Figure 33, the electrical connection section 42 comprises a first connection section 421 and a second connection section 422. The first connection section 421 and the first electrical connection body 411 are integrally formed structures. The second connection section 422 and the second electrical connection body 412 are also integrally formed structures. The first connection section 421 is rigidly connected to the second connection section 422.

[0266] A structure formed by the second connecting section 422 and the second electrical connecting body 412 is referred to as the first electrical connector 43. A structure formed by the first connecting section 421 and the second connecting section 422 is referred to as the second electrical connector 44. In the manufacturing process, the first electrical connector 43 and the second electrical connector 44 can each be formed, then the first electrical connector 43 is welded to the first end solar cell 3011, the second electrical connector 44 is welded to the second end solar cell 3012, and subsequently the first connecting section 421 and the second connecting section 422 are firmly joined together, so that adjacent solar cell strings 303 are connected to form a solar cell string group 305.

[0267] In one or more embodiments, the electrical connector 4 for connecting two adjacent solar cell strings 303 is formed by connecting the first electrical connector 43 and the second electrical connector 44, which are arranged separately, to each other, so that the first electrical connector 43 and the second electrical connector 44 can be attached to the solar cell 301 by soldering, thereby simplifying the connection difficulty of the first electrical connector 43 and the second electrical connector 44 to the solar cell 301 and thus reducing the manufacturing difficulty of the solar cell string group 305.

[0268] The first connecting section 421 and the second connecting section 422 can be directly connected to each other or indirectly connected to each other via the intermediate connecting section 23.

[0269] When the first connecting section 421 and the second connecting section 422 are directly connected, the first connecting section 421 and the second connecting section 422 are each firmly connected to the intermediate connecting section 23, thereby improving the connection stability between the first electrical connector 43 and the intermediate connecting section 23, as well as between the second electrical connector 44 and the intermediate connecting section 23.

[0270] If the first connecting section 421 and the second connecting section 422 are directly connected, as in Fig. As shown in Figure 32, the first connecting section 421 and the second connecting section 422 can be arranged opposite each other along the first direction X and be in contact with each other, and the first connecting section 421 and the second connecting section 422 are firmly connected to each other at the contact surface.

[0271] If the first connecting section 421 and the second connecting section 422 are directly connected to each other, it shows Fig. 34 A top view of the electrical connector in some other embodiments. As in Fig. As shown in Figure 34, the first connecting section 421 and the second connecting section 422 can be arranged offset along the second direction Y and be in contact with each other, wherein the first connecting section 421 and the second connecting section 422 are firmly connected to each other at the contact surface.

[0272] If the first connecting section 421 and the second connecting section 422 are directly connected to each other, it shows Fig. 35 A partially schematic structural diagram of the electrical connector in some embodiments. As in Fig. As shown in Figure 35, in the third direction Z the projection of the first connecting section 421 can partially overlap with the projection of the second connecting section 422, that is, the first connecting section 421 and the second connecting section 422 are arranged one above the other along the third direction Z, and the first connecting section 421 and the second connecting section 422 are firmly connected to each other at a contact surface.

[0273] If the first connecting section 421 and the second connecting section 422 are indirectly connected via the intermediate connecting section 23, the first connecting section 421 and the second connecting section 422 can be in contact with each other or have a gap, and the arrangement of the first connecting section 421 and the second connecting section 422 can be related to the one shown in the Fig. 32, Fig. 33, Fig. 34 to Fig. The 35 species shown refer to the details of which are not described again here.

[0274] Fig. Figure 36 is a sectional view of a connection structure between a second intermediate connecting strip and a solar cell string according to some embodiments. As in Fig. As shown in Figure 36, the photovoltaic module further comprises an insulator 6. In the third direction Z, the insulator 6 is located between the second interconnect strip 22 and the solar cell 301, i.e., between the rear surface of the solar cell 301 and the second interconnect strip 22, and between the solder strip 302 of the rear surface and the second interconnect strip 22, which is insulated by the insulator 6. This reduces the risk of the solar cell 301 being short-circuited by the second interconnect strip 22 due to contact between the second interconnect strip 22 and the solar cell 301, and thus improves the operational stability of the solar cell 301 and the photovoltaic module.

[0275] As in Fig. As shown in Figure 36, the insulator 6 extends in the first direction X to the outside of the solar cell 301 in the direction of the intermediate connection section 23, i.e., the insulator 6 protrudes in the first direction X beyond the edge of the solar cell 301, which further reduces the risk of a short circuit of the solar cell 301 caused by the contact between the second intermediate connection strip 22 and the solar cell 301 and further improves the operational stability of the solar cell 301 and the photovoltaic module.

[0276] As in Fig. As shown in Figure 36, the insulator 6 is in contact with the intermediate connection section 23 in the first direction X, thereby improving the insulating effect of the insulator 6.

[0277] Alternatively, in the first direction X a gap is provided between the insulator 6 and the intermediate connection section 23, thereby reducing the risk of installation difficulties caused by interference between the insulator 6 and the intermediate connection section 23, thus reducing the installation difficulties.

[0278] Fig. Figure 37 is a sectional view of an insulator. As in Fig. As shown in Figure 37, the insulator 6 comprises at least a first insulating layer 61, a second insulating layer 62 and a third insulating layer 63. The second insulating layer 62 is located in the third direction Z between the first insulating layer 61 and the third insulating layer 63.

[0279] In some embodiments, the first insulating layer 61 may consist of EVA, be a three-layer co-extruded EVA-POE-EVA structure, or consist of PO.

[0280] In some embodiments, the second insulating layer 62 consists of PET.

[0281] In some embodiments, the third insulating layer 63 may consist of EVA, PO, or be a three-layer co-extruded EVA-POE-EVA structure.

[0282] In the second direction Y there is an insulator 6. Fig. Figure 38 is a bottom-side view of a connection structure between an insulator and a first end solar cell according to some embodiments of the present disclosure, wherein the bottom-side view relates to a pattern obtained from the rear surface of the solar cell. As in Fig. As shown in Figure 38, in an intermediate region of the solar cell string group 305, on a solar cell string 303 of a solar cell string group 305, all solar cells 301 arranged along the second direction Y are connected to the same insulator 6, i.e., all solar cells 3011 arranged along the second direction Y at the first end are connected to the same insulator 6, and all solar cells 3012 arranged along the second direction Y at the second end are connected to the same insulator 6.

[0283] In the second direction Y there are a large number of insulators 6. Fig. Figure 39 is a top view of a connection structure between an insulator and an end solar cell according to some embodiments. As in Fig. As shown in Figure 39, in the second direction Y there are a plurality of insulators 6 in a one-to-one correspondence to the solar cell string groups, i.e., the insulators 6 are in a one-to-one correspondence to the first end solar cells 3011 in the intermediate area and in a one-to-one correspondence to the second end solar cells 3012 in the intermediate area.

[0284] In the second direction Y there are several insulators 6. Fig. Figure 40 is a top view of a connection structure between an insulator and an end solar cell according to some embodiments. As in Fig. As shown in Figure 40, there are several insulators 6 in the second direction Y. One of the insulators 6 is connected to at least two solar cell string groups, i.e., in the intermediate area, at least two first end solar cells 3011 arranged along the second direction Y are connected to the same insulator 6, and at least two second end solar cells 3012 arranged along the second direction Y are connected to the same insulator 6.

[0285] The thickness of the insulator 6 in the third direction Z, for example, is in the range of 0.1 mm to 0.8 mm, where it can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm or the like.

[0286] In some embodiments, the thickness of the insulator 6 in the third direction Z is in the range of 0.1 mm to 0.5 mm, where it may be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm or the like.

[0287] In some embodiments, the thickness of the insulator 6 in the third direction Z is in the range of 0.5 mm to 0.8 mm, where it may be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm or the like.

[0288] In the first direction X, the width of the insulator 6, for example, is in the range of 6 mm to 30 mm, which could be 6 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm or the like.

[0289] In some embodiments, the width of the insulator 6 is in the range of 6 mm to 10 mm, which may be 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm or the like.

[0290] In some embodiments, the width of the insulator 6 is in the range of 10 mm to 20 mm, and may be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm or the like.

[0291] In some embodiments, the width of the insulator 6 is in the range of 20 mm to 30 mm, and may be 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm or the like.

[0292] Based on the above structure, the electrical connector 4 is located on the light-receiving surface of the solar cell 301 or the electrical connector 4 is located on the rear surface of the solar cell 301.

[0293] Fig. 41 is a sectional view of an intermediate region of a solar cell string assembly according to some embodiments of the present disclosure. As in Fig. As shown in Figure 41, when the second intermediate connecting strip 22 is located on the rear surface of the solar cell 301 and the electrical connector 4 is located on the light-receiving surface of the solar cell 301, the distance in the third direction Z between the light-receiving surface of the electrical connector 41 and the rear surface of the solar cell 301 is equal to W1, the distance between the light-receiving surface of the second intermediate connecting strip 22 and the rear surface of the solar cell 301 is equal to W2, and the thickness of the intermediate connecting section 23 is equal to W3, where W2 ≤ W3 < W1, or W2 < W3 ≤ W1, thus enabling the intermediate connecting section 23 to be connected to the electrical connector 4 on the light-receiving surface while simultaneously reducing the risk ofthat the intermediate connection section 23 lifts the electrical connector 4 and, due to the relatively high height of the intermediate connection section 23, forms a local bulge, thereby reducing the risk of damage to the laminate at the local bulge during the lamination process.

[0294] Fig. 42 is a sectional view of an intermediate region of a solar cell string assembly according to some embodiments. As in Fig. As shown in Figure 42, when the second intermediate connecting strip 22 is located on the rear surface of the solar cell 301 and the electrical connector 4 is located on the rear surface of the solar cell 301, in the third direction Z, the distance between the light-receiving surface of the electrical connector 41 and the light-receiving surface of the second intermediate connecting strip 22 is equal to W4, the distance between the rear surface of the electrical connector 41 and the light-receiving surface of the second intermediate connecting strip 22 is equal to W5, and the thickness of the intermediate connecting section 23 is equal to W6, where W5 ≤ W6 < W4, or W5 < W6 ≤ W4, thus enabling the intermediate connecting section 23 to be connected to the electrical connector 4 on the rear surface while simultaneously reducing the risk ofthat the intermediate connection section 23 lifts the electrical connector 4 and, due to the relatively high height of the intermediate connection section 23, forms a local bulge, thereby reducing the risk of damage to the laminate at the local bulge during the lamination process.

[0295] In the third direction Z, the thickness of the second intermediate connecting strip 22 in some embodiments is in the range of 0.05 mm to 0.4 mm, which may be 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm or the like.

[0296] In some embodiments, the thickness of the second intermediate connecting strip 22 is in the range of 0.05 mm to 0.1 mm, and may be 0.05 mm, 0.055 mm, 0.06 mm, 0.065 mm, 0.07 mm, 0.075 mm, 0.08 mm, 0.085 mm, 0.09 mm, 0.095 mm, 0.1 mm or the like.

[0297] In some embodiments, the thickness of the second intermediate connecting strip 22 is in the range of 0.1 mm to 0.2 mm, which may be 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm or the like.

[0298] In some embodiments, the thickness of the second intermediate connecting strip 22 is in the range of 0.2 mm to 0.4 mm, and may be 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.3 mm, 0.32 mm, 0.34 mm, 0.36 mm, 0.38 mm, 0.4 mm or the like.

[0299] In the third direction Z, the thickness of the intermediate connecting section 23 in some embodiments is in the range of 0.2 mm to 0.6 mm, where it may be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm or the like.

[0300] In some embodiments, the thickness of the intermediate connecting section 23 is in the range of 0.2 mm to 0.4 mm, being 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.3 mm, 0.32 mm, 0.34 mm, 0.36 mm, 0.38 mm, 0.4 mm or the like.

[0301] In some embodiments, the thickness of the intermediate connecting section 23 is in the range of 0.4 mm to 0.6 mm, and may be 0.4 mm, 0.42 mm, 0.44 mm, 0.46 mm, 0.48 mm, 0.5 mm, 0.52 mm, 0.54 mm, 0.56 mm, 0.58 mm, 0.6 mm or the like.

[0302] Based on the above structure of the intermediate area, a third aspect of one or more embodiments of the present disclosure provides a teaching for the manufacture (or formation) of the photovoltaic module. Fig. Figure 43 is a flowchart of a method for manufacturing a photovoltaic module according to several embodiments. As in Fig. As shown in Figure 43, the instruction for manufacturing the photovoltaic module comprises the following steps. S1: The solar cell string group 305 is formed. S2: A large number of solar cell string groups 305 are arranged along the second direction Y. S3: The intermediate connection section 23 is placed on the electrical connector 4 in the first direction X. The intermediate connection section 23 extends along the second direction Y and is located on the rear surface of the solar cell string group 305 in the third direction Z. S4: The intermediate connection section 23 is attached to the electrical connector 4 by soldering. S5: The encapsulation layer 20 and the cover plate 10 are placed on a light-receiving surface and the rear surface of the solar cell string assembly 305 and then laminated and fastened to form a laminate. S6: A frame is mounted on one edge of the laminate to form a photovoltaic module.

[0303] Before or after step S3, the teaching for manufacturing the photovoltaic module further includes the following steps.

[0304] S7: The intermediate connecting section 23 is attached to the second intermediate connecting strip 22 by soldering.

[0305] In one or more embodiments, the second connecting strip 22 is located on the rear surface of the solar cell 301, such that part of the structure of the second connecting strip 22 is shielded by the solar cell 301. Without adjusting the dimensions of the solar cell 301 or the second connecting strip 22 in the first direction X, the overall size of the second connecting strip 22 and the solar cell string 303 in the first direction X can be reduced, thereby reducing the space required for the arrangement of the second connecting strip 22 and the solar cell string 303. This allows for the arrangement of additional solar cells 301 within a limited space, thus improving the ratio of effective area to the body area of ​​the photovoltaic module and increasing the output power of the photovoltaic module.

[0306] Fig. Figure 43 shows step S7 after step S4 and before step S5.

[0307] Fig. Figure 44 is a flowchart of a teaching for the manufacture of a photovoltaic module according to some embodiments and shows step S7 before step S3.

[0308] For the one-piece structure or the split structure of the electrical connector, one or more embodiments of the present disclosure offer different manufacturing methods.

[0309] If the electrical connector has a split structure, it is Fig. 45 A flowchart of step S1 in some embodiments. As in Fig. As shown in 45, step S1 comprises the following steps.

[0310] S11: The multitude of cells 301 is arranged along the first direction X.

[0311] S12: The solder strip 302 and the electrical connector 4 are placed on the solar cell 301 and attached by soldering to form the solar cell string 303.

[0312] S13: At least two solar cell strings 303 are arranged along the first direction X.

[0313] S14: The electrical connections 4 of the adjacent solar cell strings 303 are attached by soldering to form the solar cell string group.

[0314] The adjacent electrical connectors 4 are the first electrical connector 43 and the second electrical connector 44 described above. The first electrical connector 43 and the second electrical connector 44 can be arranged adjacent to each other along the first direction X, or they can be arranged adjacent to each other along the second direction Y, or they can have an overlapping section in the third direction Z.

[0315] Fig. 46 is a flowchart of the steps in Fig. 45 in some embodiments, and as in Fig. As shown in Figure 46, the teaching for the formation of the photovoltaic module before step S12 further includes the following steps.

[0316] S01: One end of the electrical connector 4 is flattened to form the electrical connection section 42, and the part of the electrical connector 4 that is not flattened is the electrical connection body 41. In the first direction X, the electrical connection sections 42 of the adjacent electrical connectors 4 are the first connection section 421 and the second connection section 422.

[0317] Following step S01, step S12 includes: placing the electrical connecting body 41 onto the solar cell 301 and fixing it by soldering to form the solar cell string 303.

[0318] Step S14 includes: firmly connecting the first connection section 421 and the second connection section 422.

[0319] If the electrical connector has a one-piece structure, it is Fig. 47 A flowchart of some steps of step S1 in some embodiments. As in Fig. As shown in 47, step S1 comprises the following steps.

[0320] S15: A multitude of cells 301 are arranged along the first direction X.

[0321] S16: The solder strip 302 is placed on the solar cell 301 and attached to the solar cell 301 by soldering to form the solar cell string 303.

[0322] S17: At least two solar cell strings 303 are arranged along the first direction X.

[0323] S18: Two ends of the electrical connector 4 are each placed on adjacent solar cell strings 303 and secured by soldering to form the solar cell string group 305 in the first direction X.

[0324] Fig. 48 is a flowchart of the steps in Fig. 47 in some embodiments, and as in Fig. As shown in Figure 48, the teaching for the formation of the photovoltaic module before step S18 further includes the following steps.

[0325] S02: An intermediate section of the electrical connector 4 is flattened to form the electrical connection section 42, and a part of the electrical connector that is not flattened is the electrical connection body 41.

[0326] Following step S01, step S18 includes: arranging the electrical connecting bodies 41 on adjacent solar cell strings 303 and fixing them by soldering.

[0327] If the rear surface of the solar cell 301 is provided with the insulator 6, the insulator 6 can first be attached to the solar cell string 303, and then the solar cell strings 303 are welded together to form the solar cell string group 305. Alternatively, the solar cell strings 303 can first be welded together to form the solar cell string group 305, and then the insulator 6 is attached to the solar cell string group 305.

[0328] With the in Fig. The process shown as an example in section 48 is Fig. 49 A flowchart of some steps of step S1 in some embodiments. As in Fig. As shown in Figure 49, step S1 after step S16 and before step S17 comprises the following steps.

[0329] S03: The insulator 6 is placed on the rear surface of the solar cell string 303.

[0330] S04: The insulator 6 is attached to the solar cell string 303 by spot gluing.

[0331] For example, Fig. 50 A flowchart of some steps of step S1 in some embodiments. As in Fig. As shown in Figure 50, the teaching for the manufacture of the photovoltaic module after step S3 and before step S4 comprises the following steps.

[0332] S05: The insulator 6 is placed on the rear surface of the solar cell string group 305.

[0333] S06: The insulator 6 is attached to the solar cell string group 305 by spot gluing.

[0334] Steps S03 and S05 may include specific spot bonding steps: performing hot air blowing and pressing on the insulator 6 to allow the insulator 6 to be attached to the solar cell 301.

[0335] Alternatively, specific spot bonding steps can be: Irradiating the insulator 6 with infrared lamps to attach the insulator 6 to the solar cell 301.

[0336] The specific steps of spot gluing are not particularly limited in one or more embodiments of the present disclosure.

[0337] In summary, in the teaching for manufacturing the photovoltaic module, which is provided in one or more embodiments of the present disclosure, the intermediate connecting section 23 can first be attached to the solar cell string assembly 305, and then the second intermediate connecting strip 22 is firmly connected to the intermediate connecting section 23. Alternatively, the intermediate connecting section 23 and the second intermediate connecting strip 22 can be firmly connected to each other as a whole, and then the whole is attached to the solar cell string assembly 305.

[0338] The insulator 6 can first be attached to the solar cell string group 303. The solar cell strings 303 are then connected together to form the solar cell string group 305. Alternatively, the solar cell strings 303 can first be connected together to form the solar cell string group 305, and then the insulator 6 is attached to the solar cell string group 305.

[0339] In some embodiments, when the solar cell strings 303 are first connected to form a solar cell string group 305 and then the intermediate connecting section 23, the second intermediate connecting strip 22 and the insulator 6 are attached to the solar cell string group 305, the following two steps are taken.

[0340] First, the insulator 6 is attached to the solar cell string group 305, and then the intermediate connecting section 23 and the second intermediate connecting strip 22 are attached to the solar cell string group.

[0341] Secondly, the intermediate connecting section 23, the second intermediate connecting strip 22 and the insulator 6 are connected together as a whole, and then the whole is attached to the solar cell string group 305.

Claims

Photovoltaic module comprising: a solar cell string group (305), wherein the solar cell string group (305) comprises at least two solar cell strings (303) arranged along a first direction (X), the solar cell string (303) comprising solar cells (301) and solder strips (302); wherein a plurality of solar cell string groups (305) are arranged along a second direction (Y), the first direction (X) intersecting the second direction (Y); a second busbar (12) provided in the first direction (X) on one or each of the two sides of the solar cell string group (305);and a connecting section (13) which is arranged in the thickness direction of the solar cell (301) on a side of the second busbar (12) facing a solar cell (301) of the solar cells (301), wherein the second busbar is arranged on a rear surface of the solar cell string group, wherein the second busbar (12) and the solder strip (302) are electrically connected by the connecting section (13), wherein along the thickness direction of the solar cell (301) the second busbar (12) partially overlaps the solar cell (301). Photovoltaic module according to claim 1, wherein the connecting section (13) and the second busbar (12) are attached by soldering or thermocompression fixing; alternatively, the second busbar (12) and the connecting section (13) are an integrally formed structure. Photovoltaic module according to claim 1, wherein the second busbar (12) has a first edge (121) and a second edge (122) arranged along the first direction (X), in the first direction (X) the first edge (121) is arranged on a side of the second busbar (12) facing the solar cell string group (305) and the second edge (122) is arranged on a side of the second busbar (12) facing away from the solar cell string group (305); and in the thickness direction of the solar cell (301) an edge of the connecting section (13) is aligned with the second edge (122). Photovoltaic module according to claim 3, wherein in the first direction (X) a width of the second busbar (12) is equal to H1, a width of the connecting section (13) is equal to H2, wherein 1.3 < H1 / H2 ≤ 75; and in the second direction (Y) a length of the connecting section (13) is less than a length of the second busbar (12). Photovoltaic module according to claim 1, wherein the solder strip (302) comprises an edge solder strip (3), wherein the edge solder strip (3) comprises a first body (31) and a second body (32) arranged along the first direction (X), wherein the first body (31) is electrically connected to the solar cell (301), and the second body (32) is electrically connected to the connecting section (13); and in the second direction (Y) a width of the second body (32) is greater than a width of the first body (31). Photovoltaic module according to claim 5, wherein in the thickness direction of the solar cell (301) a thickness of the second body (32) is smaller than a thickness of the first body (31). Photovoltaic module according to claim 6, wherein the edge solder strip (3) is arranged on a light-receiving surface or a rear surface of the solar cell (301); then, if the edge solder strip (3) is arranged on the light-receiving surface of the solar cell (301), a distance in the thickness direction of the solar cell (301) between a light-receiving surface of the first body (31) and the rear surface of the solar cell (301) is equal to L1, a distance between a light-receiving surface of the second busbar (12) and the rear surface of the solar cell (301) is equal to L2, and a thickness of the connecting section (13) is equal to L3, wherein L2 ≤ L3 < L1, or L2 < L3 ≤ L1;and then, when the edge solder strip (3) is located on the rear surface of the solar cell (301), in the thickness direction of the solar cell (301) a distance between the light-receiving surface of the first body (31) and the light-receiving surface of the second busbar (12) is equal to L4, a distance between a rear surface of the first body (31) and the light-receiving surface of the second busbar (12) is equal to L5, and a thickness of the connecting section (13) is equal to L6, where L5 ≤ L6 < L4, or L5 < L6 ≤ L4.; Photovoltaic module according to one of claims 1 to 7, wherein the connecting section (13) has a rectangular cross-section. Photovoltaic module according to one of claims 1 to 8, which further comprises an insulating strip (5), wherein the insulating strip (5) is arranged in the thickness direction of the solar cell (301) between the second busbar (12) and the solar cell (301). Photovoltaic module according to claim 9, wherein in the first direction (X) the insulating strip (5) extends to an outside of the solar cell (301) in a direction from the solar cell (301) to the connecting section (13). Photovoltaic module according to claim 9, wherein an insulating strip (5) is provided in the second direction; alternatively, a plurality of insulating strips (5) are provided in the second direction (Y) and the plurality of insulating strips (5) correspond one-to-one with the solar cell string groups (305); alternatively, a plurality of insulating strips (5) are provided in the second direction (Y) and one of the plurality of insulating strips (5) is connected to at least two of the solar cell string groups (305).

Images