Photovoltaikmodul

Abstract

Photovoltaic module, comprehensive: a cell string group (100) comprising a first cell string (111) and a second cell string (121) arranged along a first direction (X), wherein each cell string (101) of the first and second cell string (111, 121) comprises a plurality of solar cells (102) connected in series along the first direction (X), and the plurality of solar cells (102) comprises two end solar cells (112) at opposite ends of the respective cell string (101); a plurality of solder strips (103) extending in the first direction (X) and formed in rows of solder strips arranged at intervals along a second direction (Y), wherein each row of solder strips includes a respective row of solder strips (103) arranged at intervals along the first direction (X), wherein the plurality of solder strips (103) includes first solder strips (113) and second solder strips (123), each first solder strip (113) of the first solder strips (113) being configured to electrically connect the end solar cells (112), each second solder strip (123) of the second solder strips (123) being configured to connect a pair of adjacent solar cells (102) in one of the first and to electrically connect the second cell strings (111, 121), whereby a first end solar cell (112) is electrically connected to a second end solar cell (112) by a respective plurality of first solder strips (113) of the first solder strips (113) which are arranged at intervals along the second direction (Y) on the first and second end solar cells (112), wherein the first end solar cell (112) and the second end solar cell (112) are adjacent to each other and are each end solar cells (112) of the first and second cell strings (111, 121); a plurality of strip films (104) extending in the first direction (X) and arranged at intervals along the second direction (Y), wherein the plurality of strip films (104) includes strip films (104) each arranged on at least some of the solder strip rows, each solder strip row of the at least some of the solder strip rows being a row of second solder strips (123); and Busbars (105) arranged on and connected to the plurality of strip films (104), wherein each busbar (105) of the busbars (105) extends in the second direction Y and is electrically connected to and traversed by the respective plurality of first solder strips (113) of the first solder strips (113).

Description

TECHNICAL AREA

[0001] The present disclosure relates to the technical field of photovoltaics and in particular to a photovoltaic module. STATE OF THE ART

[0002] As fossil energy resources are gradually depleted, solar cells have become widely used as a new energy alternative. A large number of solar cells undergo string welding, lamination, and encapsulation to form a photovoltaic module. Solder strips are configured within the photovoltaic module to electrically connect adjacent solar cells. A busbar is configured to electrically connect the solder strips, that is, to collect the current carried through a large number of solder strips and ultimately combine the current at an output terminal of the photovoltaic module.

[0003] However, since photogenerated charge carriers are of different types, a solder strip for one type of photogenerated charge carrier will not be electrically connected to a grid line configured to collect photogenerated charge carriers of another type. Therefore, when designing the busbar for electrical connection with a variety of solder strips, it is necessary to ensure that the busbar is isolated from some of the strips while being electrically connected to others. This results in a complex process when arranging the busbar on a solar cell and can cause unstable electrical connections in local areas, thereby reducing the yield of the photovoltaic module. SUMMARY

[0004] The present disclosure provides a photovoltaic module which contributes to at least improving the yield of the photovoltaic module and reducing a difficulty in the manufacture of the photovoltaic module.

[0005] The present disclosure provides a photovoltaic module comprising: a cell string assembly comprising a first cell string and a second cell string arranged along a first direction. Each cell string of the first and second cell strings comprises a plurality of solar cells connected in series along the first direction, and the plurality of solar cells comprises two end solar cells at opposite ends of the respective cell string. The photovoltaic module further comprises a plurality of solder strips extending in the first direction and formed in rows of solder strips arranged at intervals along a second direction. Each row of solder strips comprises a row of solder strips arranged at intervals along the first direction. The plurality of solder strips comprises first solder strips and second solder strips.Each first solder strip of the first solder strip is configured to electrically connect the end solar cells. Each second solder strip of the second solder strip is configured to electrically connect a pair of adjacent solar cells in one of the first and second cell strings. Thus, each first end solar cell is electrically connected to each second end solar cell by a plurality of first solder strips of the first solder strips, spaced apart along the second direction on the first and second end solar cells. The first end solar cell and the second end solar cell are adjacent to each other and are end solar cells of the first and second cell strings, respectively. The photovoltaic module further includes a plurality of strip films extending in the first direction and spaced apart along the second direction.The plurality of strip films includes strip films that are each arranged on at least some of the solder strip rows, and each solder strip row of the at least some of the solder strip rows is a row of second solder strips. The photovoltaic module further includes busbars that are arranged on and bonded to the plurality of strip films. Each busbar of the busbars extends in the second direction and is electrically connected to and traverses each plurality of first solder strips.

[0006] In some embodiments, a pair of adjacent strip films of the plurality of strip films are spaced apart from each other by at least some of the first solder strips.

[0007] In some embodiments, each cell string includes an even number of solar cells. The plurality of solder strips forms an arrangement comprising alternating first rows of solder strips and second rows of solder strips, spaced at intervals along the second direction. Each first row of the first rows of solder strips includes a plurality of first solder strips and a plurality of second solder strips. Each second row of the second rows of solder strips includes a plurality of second solder strips, and each strip film of the plurality of strip films is arranged on the plurality of second solder strips of the respective second row of solder strips.

[0008] In some embodiments, each cell string includes an odd number of solar cells. The plurality of solder strips forms an arrangement comprising alternating first rows of solder strips and second rows of solder strips spaced at intervals along the second direction. Each row of first and second rows of solder strips includes a plurality of first solder strips of the first solder strips and a plurality of second solder strips of the second solder strips, and the plurality of second solder strips of each row of solder strips includes second end solder strips, each having an end section electrically connected to a corresponding end solar cell.Each strip film of the plurality of strip films is arranged on end sections of the second end solder strips of a first row of solder strips and on a plurality of second solder strips of a second row of solder strips, which is adjacent to the first row in the second direction.

[0009] In some embodiments, the first cell string includes an even number of solar cells, and the second cell string includes an odd number of solar cells. The plurality of solder strips forms an arrangement comprising alternating first rows of solder strips and second rows of solder strips spaced at intervals along the second direction. Each first row of the first rows of solder strips comprises a first solder strip and a plurality of second solder strips.Each second row of the second rows of solder strips includes a plurality of first solder strips of the first row and a plurality of second solder strips of the second row, and the plurality of second solder strips of the respective second row of solder strips includes a second end solder strip with an end section electrically connected to an end solar cell of the second cell string located away from the first cell string. Each strip film of the plurality of strip films is arranged on a plurality of second solder strips of a first row of solder strips and on the end section of the second end solder strip of a second row of solder strips adjacent in the second direction to the first row.

[0010] In some embodiments, the photovoltaic module further includes a plurality of connecting strips for electrically connecting the first and second end solar cells. Each connecting strip of the plurality of connecting strips includes at least two first solder strips of the respective plurality of first solder strips for electrically connecting the first and second end solar cells, and the at least two first solder strips are formed in one piece. The photovoltaic module further includes three busbars. The first cell string further includes a third end solar cell. The second cell string further includes a fourth end solar cell.One busbar of the three busbars is electrically connected to a plurality of first solder strips arranged on the third end solar cell, one busbar of the three busbars is electrically connected to the plurality of connecting strips, and one busbar of the three busbars is electrically connected to a plurality of first solder strips arranged on the fourth end solar cell.

[0011] In some embodiments, each solar cell in the plurality of solar cells includes first grid lines and second grid lines, and the polarity of the first grid lines differs from the polarity of the second grid lines. The first grid lines of the respective solar cell are electrically connected to the second grid lines of another solar cell in the plurality of solar cells that is adjacent to the respective solar cell in the first direction, and the second grid lines of the respective solar cell are electrically connected to the first grid lines of the other solar cell.The first end solar cell has an arrangement of first grid lines and second grid lines that is the same as an arrangement of first grid lines and second grid lines of the second end solar cell, and the first and second cell strings are connected in parallel, or the first end solar cell has an arrangement of first grid lines and second grid lines that differs from an arrangement of first grid lines and second grid lines of the second end solar cell, and the first and second cell strings are connected in series.

[0012] In some embodiments, the photovoltaic module further includes elongated mounting films extending along the second direction. The mounting films traverse the ends of the plurality of solder strips along the second direction, and at least two mounting films are arranged on each solar cell of the plurality of solar cells.

[0013] In some embodiments, the width of each solder strip of the plurality of solder strips in the second direction is less than the width of each strip film in the second direction, and the width of each strip film is greater than the width of each mounting film of the mounting films in the first direction.

[0014] In some embodiments, each strip film of the plurality of strip films comprises a first adhesive film, an insulating film, and a second adhesive film stacked along a third direction, and the first adhesive film is bonded to a corresponding solder strip of the plurality of solder strips and a corresponding solar cell of the plurality of solar cells. In the third direction, the thickness of the first adhesive film is less than or equal to the thickness of the insulating film, and the thickness of the insulating film is greater than the thickness of the second adhesive film.

[0015] In some embodiments, the ratio of the thickness of the first adhesive film, the thickness of the insulating film and the thickness of the second adhesive film is in a range of (3~4): (4~5): (1~2).

[0016] In some embodiments, the thickness of the respective strip film in the third direction is in a range of 280 µm to 320 µm.

[0017] In some embodiments, each busbar of the busbars includes a plurality of slots defined at intervals along the second direction and on sides of the respective busbar, and the first solder strips pass through the plurality of slots.

[0018] In some embodiments, the photovoltaic module further includes conductive blocks. Each conductive block is arranged between a first solder strip and a corresponding busbar.

[0019] In some embodiments, the photovoltaic module further includes a front encapsulation film arranged on one side of the cell string group facing away from the plurality of solder strips, and a rear encapsulation film arranged on one side of the cell string group facing the plurality of solder strips. The rear encapsulation film has a pre-crosslinking degree greater than that of the front encapsulation film, and the pre-crosslinking degree of the rear encapsulation film is in the range of 30% to 50%.

[0020] In some embodiments, the photovoltaic module further includes at least two cell string groups arranged at intervals along the second direction. The first cell string further includes a third end solar cell, the second cell string further includes a fourth end solar cell, and the busbars include end busbars arranged on the third and fourth end solar cells. The end busbars extend along the second direction and are further electrically connected to another cell string group adjacent to the cell string group in the second direction.

[0021] The technical solutions provided in the present disclosure have at least the following advantages: For the cell string group, the respective strip film is designed to be arranged on the multiple rows of second solder strips. The respective strip film can simultaneously secure and insulate the multiple rows of second solder strips, thereby simplifying the busbar operation and reducing the manufacturing complexity of the photovoltaic module. Furthermore, since the respective strip film is arranged along the entire length of the second end solder strips on the multiple end solar cells along the first direction, the busbars can be positioned in any region of the multiple end solar cells along the first direction.In other words, the alignment error between the busbars and the multitude of end solar cells does not need to be taken into account, effectively avoiding the problem of faulty contact between the busbars and the multiple rows of second solder strips, thus further improving the yield of the photovoltaic module. This design of the respective strip film enables both reduced manufacturing difficulty and improved yield of the photovoltaic module. Furthermore, since the respective strip film corresponds to the entire cell string group, it can be applied to the full-frame photovoltaic module without requiring a specific length of the cell string group along the first direction.Additionally, targeted placement of the respective strip film in specific areas of the cell string group reduces coating costs due to the smaller quantity of the numerous strip films used, thereby reducing the overall cost of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] One or more embodiments are illustrated with reference to the accompanying drawings, and the exemplary description does not constitute a limitation of the embodiments. The figures in the accompanying drawings do not constitute a limitation relating to scale unless otherwise indicated. In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or in the prior art, a brief description of the accompanying drawings used in the embodiments is provided below. Obviously, the accompanying drawings in the following description illustrate only some embodiments of the present disclosure, and a person skilled in the art can derive other drawings from these accompanying drawings without inventive effort. Fig. Figure 1 is a partial top view of a cell string group of a photovoltaic module provided in some embodiments of the present disclosure; Fig. 2 is a first partial top view of a photovoltaic module provided in some embodiments of the present disclosure; Fig. 3 is a second partial top view of a photovoltaic module provided in some embodiments of the present disclosure; Fig. Figure 4 is a third partial top view of the photovoltaic module provided in the embodiments of the present disclosure; Fig. Figure 5 is a fourth partial top view of the photovoltaic module provided in the embodiments of the present disclosure; Fig. Figure 6 is a fifth partial top view of the photovoltaic module provided in the embodiments of the present disclosure; Fig. Figure 7 is a sixth partial top view of a photovoltaic module provided in some embodiments of the present disclosure; Fig. Figure 8 is a circuit diagram of a photovoltaic module provided in some embodiments of the present disclosure; Fig. Figure 9 is a partial top view of a cell string in a photovoltaic module that includes two adjacent solar cells, which are provided in some embodiments of the present disclosure; Fig. 10 is a partial top view of the in Fig. 2 cell string group shown after the application of a fixing film; Fig. 11 is a partial top view of the in Fig. 3 cell strings shown after the application of a fixative film; Fig. 12 is a partial top view of the in Fig. 2 cell strings shown after arranging a delivery structure; Fig. 13 is a partial top view of the in Fig. 3 cell strings shown after arranging a delivery structure; Fig. Figure 14 shows a partial cross-sectional view of the photovoltaic module in Fig. 10 along a first cross-sectional direction AA1; Fig. Figure 15 shows another partial cross-sectional view of the photovoltaic module in Fig. 10 along the first cross-sectional direction AA1; Fig. Figure 16 shows a partial cross-sectional view of the photovoltaic module in Fig. 10 along a second cross-sectional direction BB1; Fig. 17 is a schematic partial cross-sectional diagram of a strip film in a photovoltaic module, which is provided in some embodiments of the present disclosure; Fig. Figure 18 is a schematic three-dimensional partial diagram of a cell string in a photovoltaic module, which is provided in some embodiments of the present disclosure; Fig. Figure 19 is a schematic partial cross-sectional diagram of a photovoltaic module, which is provided in some embodiments of the present disclosure; Fig. Figure 20 is a seventh partial top view of a photovoltaic module provided in some embodiments of the present disclosure; Fig. Figure 21 is a schematic partial cross-sectional diagram of an electrical connection of busbars in different cell string groups in a photovoltaic module, which is provided in some embodiments of the present disclosure. Reference numbers in the attached drawings:

[0023] 10. Battery module; 100. Cell string group; 101. Cell string; 111. First cell string; 121. Second cell string; 102. Solar cell; 112. End solar cell; 1121. Top end solar cell; 1122. Second end solar cell; 122. First grid line; 132. Second grid line; 142. First finger electrode; 152. Second finger electrode; 1021. First solar cell; 1022. Second solar cell; 103. Solder strip; 113. First solder strip; 123. Second solder strip; 133. Connecting strip; 13. Solder strip group; 1031. End; 104. Strip film; 114. First adhesive film; 124. Insulating film; 134. Second adhesive film; 105. Busbar; 115. Groove; 106, fastening film; 107, conductive block; 108, delivery structure; 118, front encapsulation film; 128, rear encapsulation film; 109, cover plate; 119, welding block. DETAILED DESCRIPTION OF THE EXECUTION FORMS

[0024] As can be seen from the state of the art, the yield of the photovoltaic module must be improved and the manufacturing difficulty of the photovoltaic module reduced.

[0025] The analysis revealed that, to realize a full-screen photovoltaic module, when connecting cell strings using busbars, the end solar cells within the cell string must be individually exposed during a full-surface film coating process. It is then necessary to subsequently arrange an insulating structure on a multitude of solder strips, which require insulation from the busbars, and then to arrange the busbars on the top side of the insulating structure; alternatively, an insulating structure can be arranged on the entire film layer, with the busbars placed on the top side of the insulating structure and the multitude of solder strips on the end solar cell, which require an electrical connection to the busbars, distributed across the insulating structure.If the cell string is not coated to secure the multitude of solder strips, alternative methods are required, such as applying adhesive to the multitude of solder strips, then arranging an insulating structure on the multitude of solder strips that require insulation from the busbars, and finally arranging the busbars on top of the insulating structure.

[0026] Therefore, to ensure that the busbar is isolated from some of the numerous solder strips and electrically connected to others, the structure for mounting the numerous solder strips and the insulating structure for isolating the busbar from some of the numerous solder strips must be designed separately. This not only complicates the busbar setup process but also increases the risk of unstable electrical connections in local areas, thereby impairing the photovoltaic module's yield.

[0027] The present disclosure provides a photovoltaic module. For a cell string group, a strip film is designed to be arranged on at least a plurality of second solder strips aligned along a first direction within a cell string group. The strip film enables the simultaneous attachment and insulation of the plurality of second solder strips, thereby simplifying the operational procedures for arranging a busbar and reducing the manufacturing difficulty of the photovoltaic module. Furthermore, since the strip film is arranged along the entire length of a corresponding second solder strip of the plurality of second solder strips on a corresponding end solar cell along the first direction, the busbar can be arranged in any region of the corresponding end solar cell along the first direction.In other words, misalignment errors between the busbar and the corresponding end solar cell do not need to be considered, and a faulty contact between the busbar and the corresponding second solder strip can be effectively avoided; thus, the yield of the photovoltaic module can be further improved. Therefore, the strip film effectively reduces manufacturing difficulty and improves the yield of the photovoltaic module. Furthermore, the strip film corresponds to an entire cell string, making it suitable for a full-frame photovoltaic module, and it has no length requirement along the first direction. The strip film is selectively applied to a specific area within the cell string, which further contributes to reducing coating costs due to the smaller quantity of strip film used, thereby lowering the overall cost of the photovoltaic module.

[0028] In the description of embodiments of this disclosure, the technical terms "first," "second," etc., are used only to distinguish one element from another and should not be understood as indicating or implying any relative importance or as implying the number, specific order, or priority of the technical features mentioned. In the description of embodiments of this disclosure, "multiple" means two or more unless expressly stated otherwise.

[0029] References to "embodiment(s)" herein mean that certain features, structures, or properties described in combination with the embodiment(s) may be included in at least some embodiments of the present disclosure. A phrase appearing at different points in the patent specification does not necessarily refer to the same embodiment, nor does an independent or alternative embodiment exclude one another from other embodiments. Persons skilled in the art expressly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0030] In the description of embodiments of the present disclosure, the term "and / or" merely indicates a relationship of belonging, describing related objects by specifying that three types of relationships can exist, for example, A and / or B, which signifies three possible cases: the presence of A alone, the presence of both A and B, and the presence of B alone. Furthermore, the symbol " / " herein generally indicates that the related objects are in an "or" relationship.

[0031] In the description of embodiments of the present disclosure, the term “a plurality of” means two or more (including two). Similarly, the term “a plurality of groups” means two or more groups (including two groups), and “a plurality of parts” means two or more parts (including two parts).

[0032] In the description of this disclosure, the terms “central”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, and other specified orientation or position relationships are based on the orientation or position relationships shown in the accompanying drawings and serve only to facilitate and simplify the description of this disclosure, rather than indicating or implying that the specified devices or elements must have a particular orientation or be designed and operated in a particular orientation, and are therefore not to be interpreted as limiting the embodiments of this disclosure.

[0033] In describing the embodiments of this disclosure, it should be noted that, unless otherwise specified and clearly defined, the technical terms "assemble," "connect," and "connection" are to be understood in their broadest sense. For example, the connection may be a fixed connection, a detachable connection, or an integrated connection; a mechanical or an electrical connection; and a direct connection or an indirect connection via an intermediate medium or communication between two elements. For persons skilled in the art, the specific meanings of the aforementioned terms in the embodiments of this disclosure may be understood according to the specific circumstances.

[0034] In the drawings corresponding to the embodiments of this disclosure, the thicknesses and sizes of layers are shown enlarged for clarity and easier illustration. When it is described that a component (such as a layer, a film, an area, or a substrate) is located "on" another component or "on a surface of another component," the component may be located directly on the surface of the other component, or a third component may be placed between the two components. Conversely, when a component is described as being located on the surface of another component, or when a component is described as being formed or attached to the surface of another component, this indicates that no third component exists between the two components.Furthermore, when a component is described as being “essentially formed on” another component, it means that the component is formed neither over the entire surface (or front face) of the other component nor merely on a section of an edge of the same.

[0035] When, in the description of the embodiments of the present disclosure, a particular component is described as "including" another component, this does not, unless otherwise specified, exclude the presence of other components, and other components may likewise be included. Furthermore, when a component such as a layer, a film, a region, or a plate is described as "on" or "attached to" another component, it may be "directly on" the other component (i.e., attached to a surface of the other component without an intervening component), or other components may be attached between it and the other component.Furthermore, if a layer, film, area or plate is located "directly on" another component, or if a layer, film, area or plate is attached to the surface of another component, this indicates that no other components are present between them.

[0036] The terminology used in the description of the various embodiments herein is intended to describe only specific embodiments and is not intended to be restrictive. As used in the description of the various embodiments and the appended claims, singular forms are intended to include plural forms unless the context clearly indicates otherwise. The component includes, but is not limited to, a layer, a film, a region, or a plate.

[0037] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented for each embodiment of the present disclosure to facilitate readers' understanding. Nevertheless, the technical solutions to be protected according to the embodiments of the present disclosure can also be implemented in substance without these technical details and various changes and modifications based on the embodiments described below.

[0038] In the drawings, the thicknesses of layers, films, panels, areas, etc., are exaggerated for clarity. The same reference symbols denote the same elements throughout the description. It is understood that when an element such as a layer, film, area, or substrate is described as being "on" another element, it may be located directly on top of that element, or there may be intermediate elements. Conversely, when an element is described as being "directly on" another element, there are no intermediate elements.

[0039] The embodiments of the present disclosure provide a photovoltaic module, which is described in detail below with reference to the accompanying drawings.

[0040] With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 to Fig. Figure 9 includes the photovoltaic module: a cell string group 100, which includes two cell strings 101 arranged along a first direction X, i.e., a first cell string and a second cell string. Each cell string 101 of the two cell strings 101 includes a plurality of solar cells 102 connected in series along the first direction X. The plurality of solar cells 102 includes two opposite end solar cells 112, which are arranged at the ends of the respective cell string 101 in the first direction X. The photovoltaic module further includes a plurality of solder strips 103, which are arranged at intervals along the first direction X and a second direction Y, which intersects the first direction X. The plurality of solder strips 103 includes first solder strips 113 and second solder strips 123. The first solder strips 113 are electrically connected to the end solar cells 112.Each second solder strip 123 of the second solder strips 123 is configured to electrically connect two adjacent solar cells 102 of the plurality of solar cells 102. The second solder strips 123 form a plurality of rows of second solder strips 123 arranged at intervals along the second direction Y. A first end solar cell 112 of the first cell string is electrically connected to a second end solar cell 112 of the second cell string, which is adjacent to the first end solar cell 112, by a plurality of first solder strips 113 of the first solder strips 113, which are arranged on the first and second end solar cells 112 and are in electrical connection. The photovoltaic module further includes a plurality of strip films 104 arranged at intervals along the second direction Y.Each strip film 104 of the plurality of strip films 104 is arranged on at least one row of the plurality of rows of second solder strips 123. The photovoltaic module further includes busbars 105, which are arranged on and bonded to the plurality of strip films 104. In addition, the busbars 105 are electrically connected to the first solder strips 113 and traverse them along the second direction Y.

[0041] Fig. Figure 1 is a partial top view of a cell string group of a photovoltaic module provided in some embodiments of the present disclosure. Fig. Figure 2 is a first partial top view of a photovoltaic module provided in some embodiments of the present disclosure. Fig. Figure 3 is a second partial top view of a photovoltaic module provided in some embodiments of the present disclosure. Fig. Figure 4 is a third partial top view of the photovoltaic module provided in the embodiments of the present disclosure. Fig. Figure 5 is a fourth partial top view of the photovoltaic module provided in the embodiments of the present disclosure. Fig. Figure 6 is a fifth partial top view of the photovoltaic module provided in the embodiments of the present disclosure. Fig. Figure 7 is a sixth partial top view of a photovoltaic module provided in some embodiments of the present disclosure. Fig. Figure 8 is a circuit diagram of a photovoltaic module provided in some embodiments of the present disclosure. Fig. Figure 9 is a partial top view of a cell string in a photovoltaic module that includes two adjacent solar cells according to some embodiments of the present disclosure. It should be noted that, in order to clearly illustrate a positional relationship between the strip films 104 and the plurality of solder strips 103 corresponding to the cell string group 100, the strip films 104 in the Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7 are drawn in perspective. The strip films 104 are discussed below using six examples. Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. The seven cases shown are described in detail. Additionally, the design of the electrical connection between the multitude of solder strips 103 and the solar cells 102 is described below based on Fig. 9 described in detail.

[0042] It is worth noting that, regardless of the type of photogenerated charge carriers collected by grid lines electrically connected to a corresponding solder strip 103, in the plurality of solar cells 102, each cell string 101 includes two solder strips 103, i.e., first solder strips 113 and second solder strips 123. The first solder strips 113 are electrically connected to the end solar cells 112, and the respective second solder strip 123 is configured to electrically connect any two adjacent solar cells 102 of the plurality of solar cells 102. In other words, the first solder strips 113 are only electrically connected to the end solar cells 112. Regardless of whether the plurality of solar cells 102 are the end solar cells 112, the respective second solder strip 123 is configured to electrically connect any two adjacent solar cells 102 of the plurality of solar cells 102. Thus, the first solder strips 113 in the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7 are shown with thicker solid lines, and the second solder strips 123 are shown with thinner solid lines.

[0043] In some embodiments, the busbars 105 are electrically connected to the first solder strips 113 and traverse them along the second direction Y, based on the configuration of the first solder strips 113 and the second solder strips 123. That is, the busbars 105 are electrically connected to the first solder strips 113 on a corresponding end solar cell 112 and are insulated from a plurality of second solder strips 123 arranged on the corresponding end solar cell 112. Therefore, in a cell string group 100, the respective strip film 104 is arranged at least on the plurality of second solder strips 123. That is, the plurality of second solder strips 123 is aligned, or substantially aligned, along the first direction X. The respective strip film 104 is configured to secure the plurality of second solder strips 123.The plurality of rows of second solder strips 123 includes a plurality of second solder strips 123 arranged on a corresponding end solar cell 112, wherein the respective strip film 104 covers a corresponding second solder strip 123 of the plurality of second solder strips 123 arranged on the corresponding end solar cell 112 and insulates the corresponding second solder strip 123 from the busbars 105. In other words, the respective strip film 104 is configured to simultaneously secure and insulate the plurality of rows of second solder strips 123, thereby simplifying the operational processes of the busbar arrangement 105 and reducing the manufacturing difficulty of the photovoltaic module. Additionally, along the first direction X, the respective strip film 104 is arranged over the entire corresponding second solder strip 123 that is arranged on the corresponding end solar cell 112.Therefore, only the first solder strips 113, which are electrically connected to the corresponding end solar cell 112, are exposed. Consequently, it is not necessary for the busbars 105 to be located in specific areas of the corresponding end solar cell 112. Along the first direction X, the busbars 105 can be located in any area of ​​the corresponding end solar cell 112. In other words, it is not necessary to account for an alignment error between the busbar 105 and the corresponding end solar cell 112, thus effectively avoiding the problem of accidental contact between the busbars 105 and the corresponding second solder strip 123, which further improves the yield of the photovoltaic module. In this way, by means of the respective strip film 104, it is beneficial to simultaneously reduce the manufacturing difficulty of the photovoltaic module and improve its yield.Furthermore, the strip films 104 are arranged according to the entire cell string group 100, making them applicable for full-screen photovoltaic modules, and there are no requirements for the length of the cell string group 100 along the first direction X.

[0044] In addition, the strip films 104 are arranged in a local area of ​​the cell string group 100 compared to the attachment of the corresponding solder strip by covering an entire surface of the same with a film, which is also advantageous in order to reduce the coating costs by using fewer strip films 104, thereby reducing the cost of the photovoltaic module.

[0045] It should be noted that the first end solar cell of the first cell string is electrically connected to the second end solar cell of the second cell string, which is adjacent to the first end solar cell, by the plurality of first solder strips 113 of the first solder strips 113 that are arranged on the first and second end solar cells and are in electrical connection, which includes at least: due to the plurality of first solder strips 113 of the first solder strips 113 that are arranged on the first and second end solar cells and are in electrical connection, the first and second end solar cells are connected in series, thereby connecting the first and second cell strings in series; or the first and second end solar cells are connected in parallel, thereby connecting the first and second cell strings in parallel. The series or parallel connections of the first and second cell strings in the cell string group 100 are described in detail below.

[0046] Generally, when each strip film 104 is arranged on the array of multiple rows of second solder strips 123, it will completely cover surfaces of the array of multiple rows of second solder strips 123 to provide all-around insulation for the array of multiple rows of second solder strips 123. However, considering a process error in the arrangement of the strip films 104, if each strip film 104 is arranged on the array of multiple rows of second solder strips 123 away from the multiple solar cells 102, it may not cover part of a side surface of a second solder strip 123 in the array of multiple rows of second solder strips 123.Nevertheless, the respective strip film 104 can still insulate the second solder strip 123 and the bus bars 105 along a third direction, that is, along a thickness direction of a respective solar cell 102 of the plurality of solar cells 102, thereby ensuring the insulation of the bus bars 105 and the corresponding second solder strip 123.

[0047] Furthermore, each end solar cell 112 of the end solar cells 112 is provided with first solder strips 113 and second solder strips 123, which are arranged alternately along the second direction Y. That is, along the second direction Y, each pair of first solder strips 113 of the first solder strips 113 is spaced apart from each other by at least some of the second solder strips 123, and each pair of second solder strips 123 of the second solder strips 123 is spaced apart from each other by at least some of the first solder strips 113. Along the second direction Y, a plurality of second solder strips 123 of the second solder strips 123 are arranged at intervals on each solar cell 102 of the plurality of solar cells 102 in addition to the end solar cells 112. Each pair of adjacent second solder strips 123 of the plurality of second solder strips 123 extends to two solar cells 102 that are adjacent to the respective solar cell 102.Based on this, the second solder strips 123 form a plurality of rows of second solder strips 123, which are arranged at intervals along the second direction; that is, a row of the plurality of rows of second solder strips 123 is aligned or substantially aligned along the first direction X, which can refer to an extension line of the row of the plurality of rows of second solder strips 123 that overlaps or nearly overlaps (slight offset due to process accuracy). Furthermore, the following statement "a plurality of components forms a plurality of component rows" can also refer to an extension line of a row of the plurality of component rows that overlaps or nearly overlaps.

[0048] It should be emphasized that a line of intersection of the first direction X and the second direction Y implies that the first direction X and the second direction Y are orthogonal, or that an angle formed by the line of intersection of the first direction X and the second direction Y is an obtuse angle, or that an angle formed by the line of intersection of the first direction X and the second direction Y is an acute angle.

[0049] In some examples, the angle formed by the line of intersection of the first direction X and the second direction Y can be between 10° and 90°, such as 10°, 20°, 45°, 55°, 70°, 82°, or 90°. In some examples, the angle formed by the line of intersection of the first direction X and the second direction Y can also be between 45° and 90°, such as 50°, 55°, 60°, 65°, 70°, 75°, 80°, or 85°.

[0050] The photovoltaic module provided in the embodiments of the present disclosure is described in detail below with reference to the accompanying drawings.

[0051] In some embodiments, with reference to Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7. For at least one end solar cell 112, the respective strip film 104 is arranged on a corresponding second solder strip 123 on a corresponding end solar cell 112 and on a series of the plurality of series of second solder strips 123, which are aligned or substantially aligned with the corresponding second solder strip 123 along the first direction X. Additionally, the plurality of strip films 104 are arranged on the at least one end solar cell 112 and spaced at intervals along the second direction Y.

[0052] In some embodiments, with reference to Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7. Two strip films 104 of the plurality of strip films 104 are spaced apart from each other by at least some of the first solder strips 113. Thus, for the end solar cells 112, the plurality of strip films 104 only provide insulation protection for the plurality of rows of second solder strips 123. For example, a strip film 104 covers only the plurality of rows of second solder strips 123, but does not provide insulation protection for at least some of the first solder strips 113; that is, at least some of the first solder strips 113 are exposed by the respective strip film 104. In this way, the respective strip film 104 is configured to secure and insulate the plurality of rows of second solder strips 123, which allows for a subsequent configuration of the busbars 105 that can be electrically connected to at least some of the first solder strips 113 on the end solar cell 112.

[0053] In the following, a positional relationship between the plurality of strip films 104 and the plurality of solder strips 103 is described with reference to Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7 described in detail.

[0054] In some embodiments, referring to Fig. 2 or Fig. Each cell string 101 includes a third end solar cell 1121, a first end solar cell 1122, and an even number of solar cells 102. The plurality of solder strips 103 forms an arrangement that includes alternating first rows of solder strips 103 and second rows of solder strips 103, spaced at intervals along the second direction Y. Each first row of the first rows of solder strips 103 includes a plurality of first solder strips 113 and a plurality of second solder strips 123. Each second row of the second rows of solder strips 103 includes a plurality of second solder strips 123. The respective strip film 104 is arranged on the plurality of second solder strips 123 of the respective second row of solder strips 103.

[0055] It is worth noting that, since each cell string 101 includes the even number of solar cells 102, a first solder strip 113 of the respective first row of the first rows of solder strips 103, which is arranged on the third end solar cell 1121, is aligned or substantially aligned with a corresponding first solder strip 113 of the respective first row of the first rows of solder strips 103, which is arranged on the first end solar cell 1122, along the first direction X, and a second solder strip 123 of the respective first row of the first rows of solder strips 103, which is arranged on the third end solar cell 1121, is aligned or substantially aligned with a corresponding second solder strip 123 of the respective first row of the first rows of solder strips 103, which is arranged on the first end solar cell 1122, along the first direction X.Therefore, each strip film 104 is designed as an elongated structure extending along the first direction X, thus fulfilling the requirement that each strip film 104 is arranged on the plurality of second solder strips 123 of the respective first row of the first rows of solder strips 103. It should be noted that... Fig. 2 and Fig. Figure 3 shows only four solar cells 102 in the cell string 101. In actual applications, there is no limit to the number of solar cells 102 in the cell string 101, and it can be designed according to specific requirements. Furthermore, it illustrates Fig. 2 based on the fact that each cell string 101 includes the even number of solar cells 102, a parallel connection of the two cell strings 101 of the cell string group 100, and Fig. Figure 3 illustrates a series connection of the two cell strings 101 of the cell string group 100. The parallel or series connection of the two cell strings 101 of the cell string group 100 is explained in more detail below.

[0056] In some embodiments, referring to Fig. 4 or Fig. Each cell string 101 includes a third end solar cell 1121, a first end solar cell 1122, and an odd number of solar cells 102. The plurality of solder strips 103 forms an arrangement that includes alternating first rows of solder strips 103 and second rows of solder strips 103, spaced apart along the second direction Y. Each row of the first and second rows of solder strips 103 is a solder strip group 13 and includes a plurality of first solder strips 113 and a plurality of second solder strips 123. The plurality of second solder strips 123 of each row of solder strips 103 includes second end solder strips 123, each having an end section electrically connected to a corresponding end solar cell 112.The respective strip film 104 is arranged at end sections of the second end solder strips 123 of a first row of solder strips 103 and at a plurality of second solder strips 123 of a second row of solder strips 103, which is adjacent in the second direction Y to the first row.

[0057] It is worth noting that, since each cell string 101 includes the odd number of solar cells 102, the plurality of first solder strips 113 of the respective row of solder strips 103 arranged on the third end solar cell 1121 are not aligned along the first direction X with the plurality of first solder strips 113 of the respective row of solder strips 103 arranged on the first end solar cell 1122. Therefore, second end solder strips 123 corresponding to the third end solar cell 1121 are not aligned along the first direction X with second end solder strips 123 corresponding to the first end solar cell 1122.The plurality of first solder strips 113 of the respective series of solder strips 103, which are arranged on the third end solar cell 1121, belong to a solder strip group 13, and the plurality of first solder strips 113 of the respective series of solder strips 103, which are arranged on the first end solar cell 1122, belong to a corresponding solder strip group 13 that is adjacent to the solder strip group 13 along the second direction Y. And the plurality of first solder strips 113 of the respective series of solder strips 103, which are arranged on the first end solar cell 1122 of the first cell string, are adjacent to a plurality of first solder strips 113 of the respective series of solder strips 103, which are arranged on a second end solar cell of the second cell string.

[0058] Therefore, each strip film 104 is arranged at end sections of the second end solder strips 123 of a first row of solder strips 103 and at a plurality of second solder strips 123 of a second row of solder strips 103 that is adjacent to the first row in the second direction Y. Thus, each strip film 104 is arranged at the plurality of second solder strips 123 of the respective row of the first and second rows of solder strips 103, and each strip film 104 is located between end sections of the second end solder strips 123 (e.g., second end solder strips 123, each electrically connected to the third end solar cell 1121 of the first cell string on the left, which is in Fig. 4 is shown, or a fourth end solar cell 1122 of the second cell string on the right, which is in Fig. (as shown in Figure 4, connected) a first row of solder strips 103 and a plurality of second solder strips 123 of a second row of solder strips 103, which is adjacent to the first row in the second direction Y, bent. In this way, it can be ensured that the respective strip film 104 can insulate the second end solder strips 123 and the busbars 105 and can attach at least some of the plurality of solder strips 103 to the plurality of solar cells 102.

[0059] It should be noted that the Fig. 4 and Fig. 5 only represent five solar cells 102 in the respective cell string 101. In practical applications, there is no limit to the number of solar cells 102 in the respective cell string 101, and it can be designed according to specific requirements. Fig. 4 and Fig. 5. Each of two adjacent solder strip groups 13 along the second direction Y is indicated by two dashed boxes. Additionally illustrated Fig. 4 based on the fact that the respective cell string 101 includes the odd number of solar cells 102, a parallel connection of the two cell strings 101 of the cell string group 100, and Fig. Figure 5 illustrates a series connection of the two cell strings 101 of the cell string group 100. The parallel or series connection of the two cell strings 101 of the cell string group 100 is explained in more detail below.

[0060] In some embodiments, with reference to Fig. 4 and Fig. 5 the respective strip film 104 is arranged at end sections of the second end solder strips 123 of a first row of solder strips 103 and at a plurality of second solder strips 123 of a second row of solder strips 103, which is adjacent in the second direction Y to the first row.

[0061] In some embodiments, referring to Fig. 6 or Fig. 7. The cell string group 100 includes a first cell string 111 and a second cell string 121. The first cell string 111 includes a first end cell 1122, a third end cell 1121, and an even number of solar cells 102, and the second cell string 121 includes a second end cell 1121, a fourth end cell 1122 (i.e., a target solar cell), and an odd number of solar cells 102. The plurality of solder strips 103 forms an arrangement that includes alternating first rows of solder strips 103 and second rows of solder strips 103, spaced at intervals along the second direction Y. Each first row of the first rows of solder strips 103 includes a first solder strip 113 and a plurality of second solder strips 123.Each second row of the second rows of solder strips 103 includes a plurality of first solder strips 113 of the first solder strips 113 and a plurality of second solder strips 123 of the second solder strips 123. The plurality of second solder strips 123 of the respective second row of solder strips 103 includes a second end solder strip 123 with an end section that is electrically connected to an end solar cell 112 of the second cell string 121, which is located away from the first cell string 111. That is, the second end solder strip 123 has an end section that is electrically connected to the fourth end solar cell 1122 of the second cell string 121. The respective strip film 104 is arranged on a plurality of second solder strips 123 of a first row of solder strips 103 and on the end section of the second end solder strip 123 of a second row of solder strips 103 that is adjacent in the second direction Y to the first row.

[0062] It is worth noting that, since the first cell string 111 includes the even number of solar cells 102 and the second cell string 121 includes the odd number of solar cells 102, a first solder strip 113 of the respective second row of solder strips 103, which is located on the third end solar cell 1121 of the first cell string 111, is aligned, or substantially aligned, with a corresponding first solder strip 113 of the respective second row of solder strips 103, which is located on the first end solar cell 1122 of the first cell string 111, along the first direction X. However, the first solder strip 113 of the respective first row of the first rows of solder strips 103 is not aligned with the plurality of first solder strips 113 of the respective second row of solder strips 103.Furthermore, a first solder strip 113 of each row of the first and second rows, located on the first end solar cell 1122 of the first cell string 111, is adjacent to a corresponding first solder strip 113 of the respective row of the first and second rows, located on the second end solar cell 1121 of the second cell string 121. Finally, only a first solder strip 113, located on the fourth end solar cell 1122 of the second cell string 121, is not aligned with first solder strips 113 located on the first and third end solar cells 1122 of the first cell string 111 and the second end solar cell 1121 of the second cell string 121 along the first direction X.

[0063] Therefore, the end solar cell of the second cell string 121, which is located away from the first cell string 111, serves as the target solar cell, as does the fourth end solar cell 1122 of the second cell string 121 in Fig. 6 and Fig. 7. The respective strip film 104 is arranged on the plurality of second solder strips 123 of the first row of solder strips 103 and on the end section of the second end solder strip 123 on the target solar cell, and is also bent between the second end solder strip 123 on the target solar cell and a corresponding first solder strip 113 adjacent to the second end solder strip 123. In this way, it can be ensured that the respective strip film 104 can insulate the plurality of second solder strips 123 on the end solar cell 112 and the busbars 105 and can secure at least some of the plurality of solder strips 103 on the plurality of solar cells 102.

[0064] It should be noted that Fig. 6 and Fig. Figure 7 shows only four solar cells 102 in the first cell string 111 and five solar cells 102 in the second cell string 121. In practical applications, the number of solar cells 102 in the first cell string 111 and the second cell string 121 is not limited and can be designed according to specific requirements. Furthermore, it illustrates Fig. 6 based on the fact that the first cell string 111 includes the even number of solar cells 102 and the second cell string 121 includes the odd number of solar cells 102, a parallel connection of the two cell strings 101 of the cell string group 100, and Fig. Figure 7 illustrates a series connection of the two cell strings 101 of the cell string group 100. The parallel or series connection of the two cell strings 101 of the cell string group 100 is explained in more detail below.

[0065] In the above embodiments, with reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7. The photovoltaic module further includes a plurality of connecting strips 133 for electrically connecting the first and second end solar cells 112. Each connecting strip 133 of the plurality of connecting strips 133 includes at least two first solder strips 113 of the plurality of first solder strips 113 for electrically connecting the first and second end solar cells 112. The at least two first solder strips 113 are formed in one piece. The photovoltaic module further includes three busbars 105, the first cell string 111 further includes a third end solar cell 112, and the second cell string 121 further includes a fourth end solar cell 112.One busbar 105 of the three busbars 105 is electrically connected to a plurality of first solder strips 113 arranged on the third end solar cell 112, one busbar 105 of the three busbars 105 is electrically connected to the plurality of connecting strips 133, and one busbar 105 of the three busbars 105 is electrically connected to a plurality of first solder strips 113 arranged on the fourth end solar cell 112.

[0066] It is worth noting that the busbar 105 of the three busbars 105 is electrically connected to the multiple connecting strips 133; that is, the busbar 105 of the three busbars 105 is located in the center of the cell string group 100. In other words, the busbar 105 of the three busbars 105 can be located on the first end solar cell 1122 of the first cell string or on the second end solar cell 1121 of the second cell string. This allows for greater flexibility in the arrangement of the busbars 105, which can further improve the yield of the photovoltaic module.

[0067] It is worth mentioning that, with reference to Fig. 4, Fig. 5, Fig. 6 to Fig. 7 A first solder strip 113 of a first row of solder strips 103 and a corresponding second solder strip 123 of a second row of solder strips 103, which is adjacent to the first row in the second direction Y, form a pair of solder strips. As in Fig. 4, Fig. 5, Fig. 6 to Fig. As shown in Figure 7, for example, a first solar cell 1021 includes 5 pairs of solder strips and a second solder strip 123. The respective strip film 104 is simultaneously arranged on two second solder strips 123, which are adjacent to each other along the second direction Y on a final solar cell 112 of at least one cell string 101 of the two cell strings 101. In practical applications, if a plurality of pairs of solder strips are arranged on a solar cell of the plurality of solar cells, then the respective strip film will only cover one second solder strip on a final solar cell.

[0068] In some embodiments, with reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 to Fig. 9. Each solar cell 102 of the plurality of solar cells 102 has first grid lines 122 and second grid lines 132, and the polarity of the first grid lines 122 differs from the polarity of the second grid lines 132. The first grid lines 122 of each solar cell 102 are electrically connected to the second grid lines 132 of another solar cell 102 of the plurality of solar cells 102 that is adjacent to the respective solar cell 102 in the first direction X, and the second grid lines 132 of each solar cell 102 are electrically connected to the first grid lines 122 of the other solar cell 102. In other words, in each cell string 101, the plurality of solar cells 102 includes a first solar cell 1021 and a second solar cell 1022 that is adjacent to the first solar cell 1021.The first grid lines 122 of the first solar cell 1021 are electrically connected to the second grid lines 132 of the second solar cell 1022, and the first grid lines 122 of the second solar cell 1022 are electrically connected to the second grid lines 132 of the first solar cell 1021. It is worth noting that each solar cell 1022 has an arrangement of first grid lines 122 and second grid lines 132 that differs from the arrangement of first grid lines 122 and second grid lines 132 of any other solar cell 1022 of the plurality of solar cells 1022 adjacent to the respective solar cell 1022 in the first direction X. For example, along the first direction X, each first grid line 122 of the first grid lines 122 of the first solar cell 1021 is aligned, or substantially aligned, with a corresponding second grid line 132 of the second grid lines 132 of the second solar cell 1022 along the first direction X.The polarity difference between the first grid lines 122 and the second grid lines 132 is due to different types of photogenerated charge carriers collected by the first grid lines 122 and the second grid lines 132.

[0069] It should be noted that, to clearly illustrate the different types of the multitude of solar cells 102 in the cell string 101 Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 to Fig. Figure 9 shows the first solar cell 1021 and the second solar cell 1022 with different filling methods. The first solar cell 1021 is characterized by a white filling. Furthermore, the final solar cell 112 can be configured as either the first solar cell 1021 or the second solar cell 1022, depending on specific requirements.

[0070] Furthermore, with reference to Fig. 9. The first grid lines 122 and the second grid lines 132 can be considered the main grids of the first and second solar cells. Each solar cell 102 of the first and second solar cells can also have alternating first finger electrodes 142 and second finger electrodes 152 arranged along the first direction X. Each first finger electrode 142 of the first finger electrodes 142 is electrically connected to a corresponding first grid line 122 of the first grid lines 122. Each first finger electrode 142 has a break at a corresponding second grid line 132 of the second grid lines 132 or has an insulating structure at its intersection with the corresponding second grid line 132. Each second finger electrode 152 of the second finger electrodes 152 is electrically connected to a corresponding second grid line 132 of the second grid lines 132.The respective second finger electrode 152 has a break at a corresponding first grid line 122 of the first grid lines 122 or has an insulating structure at its intersection with the corresponding first grid line 122. It should be noted that in . Fig. Figure 9 shows an example of the respective first finger electrode 142 with the interruption at the corresponding second grid line 132 and the respective second finger electrode 152 with the interruption at the corresponding first grid line 122. Furthermore, it shows Fig. 9 the multitude of solder strips 103 in perspective representation to clearly illustrate an electrical connection relationship between the respective first grid line 122 and the corresponding second grid line 132 in the first and second solar cells.

[0071] Furthermore, with reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 to Fig. In the second direction Y, each solar cell 102 has a predefined edge S. Within each cell string 101, the plurality of solar cells 102 enclose a first solar cell 1021 and a second solar cell 1022, which is adjacent to the first solar cell 1021. One of the first grid lines 122 and the second grid line 132 on the first solar cell 1021 faces the predefined edge S, and the other of the first grid lines 122 and the second grid line 132 on the second solar cell 1022 faces the predefined edge S. It should be noted that in Fig. 9 an example of the first grid lines 122 on the first solar cell 1021, which face the preset edge S, and the second grid lines 132 on the second solar cell 1022, which face the preset edge S, is taken.

[0072] A method for electrically connecting the two cell strings 101 in the cell string group 100 based on the first solar cell 1021 and the second solar cell 1022 is described in detail below.

[0073] In some embodiments, with reference to Fig. 2, Fig. 4 or Fig. 6 in cell string group 100, the first end solar cell 112 has an arrangement of first grid lines and second grid lines that is the same as an arrangement of first grid lines and second grid lines of the second end solar cell 112, i.e., the first and second end solar cells 112 are either both first solar cells 1021 or both second solar cells 1022, thus connecting the two cell strings 101 in parallel. It should be noted that in Fig. 2, Fig. 4 and Fig. 6. An example is taken where the first and second end solar cells 112 are both first solar cells 1021. In practical applications, the first and second end solar cells can also both be second solar cells.

[0074] In some embodiments, with reference to Fig. 3, Fig. 5 or Fig. 7 in the cell string group 100 the first end solar cell 112 has an arrangement of first grid lines and second grid lines that differs from an arrangement of first grid lines and second grid lines of the second end solar cell 112, i.e. the first and second end solar cells 112 are implemented as a first solar cell 1021 and a second solar cell 1022, whereby the two cell strings 101 are connected in series.

[0075] In some embodiments, with reference to Fig. 10 or Fig. 11. Each solder strip 103 has two ends 1031 along the first direction X. The photovoltaic module can further include elongated mounting films 106 extending along the second direction Y. The mounting films 106 traverse a plurality of ends 1031 spaced at intervals along the second direction Y. At least two mounting films 106 are arranged on each solar cell 102 of the plurality of solar cells 102. Thus, each mounting film 106 of the mounting films 106 is configured to secure a corresponding solder strip 103 of the plurality of solder strips 103 without a strip film 104. It is worth noting that if the busbars 105 are arranged downstream, the busbars 105 can be arranged in any area on the end solar cell 112, except where the respective mounting film 106 is located.

[0076] Fig. 10 is a partial top view of the in Fig. 2 cell string group shown after the application of a fixing film. Fig. Figure 11 is a partial top view of the in Fig. The cell string group shown in Figure 3 includes a mounting film. To clearly illustrate the positional relationship between the mounting film 106 and the corresponding solder strip 103, the mounting film 106 is shown in Figure 3. Fig. 10 and Fig. 11 shown in perspective.

[0077] In some embodiments, with further reference to Fig. 10 or Fig. 11 A plurality of mounting films 106 and a plurality of strip films 104, arranged on the cell string group 100, are formed in one piece. In this way, the plurality of mounting films 106 and the plurality of strip films 104 can form a grid structure for the cell string group 100, which is advantageous for attaching the plurality of solder strips 103 to the respective solar cell 102 in the cell string group 100 in a single process and achieving insulation protection for the second solder strips 123 on the end solar cells 112, thereby further simplifying the process difficulty for realizing a full-frame photovoltaic module.

[0078] In some embodiments, the multiple strip films and the mounting films can be produced sequentially. It is worth noting that, regardless of whether the multiple strip films and the mounting films are formed in one piece or in stages, they can be made of the same material. Furthermore, if the multiple strip films and the mounting films are produced sequentially, they can be made of different materials. The multiple strip films are made of a material with good adhesion and insulation properties. The mounting films can be made of a material with good adhesion properties, and the insulation performance requirements for the mounting films are not high.

[0079] In some embodiments, with reference to Fig. 12 or Fig. 13 The respective solder strip 103 has two ends 1031 along the first direction X. The photovoltaic module can further include delivery structures 108 arranged at least at a plurality of ends 1031 spaced at intervals along the second direction Y. The delivery structures 108 are arranged at ends 1031 of the first solder strip 113 and ends 1031 of the second solder strip 123 without the arranged strip films 104. Thus, the delivery structure 108 is configured to attach a corresponding solder strip 103 without the arranged strip films 104. The delivery structures 108 are small, which helps to further reduce the manufacturing costs of the photovoltaic module. It is worth noting that if the busbar 105 is arranged downstream, the busbar 105 can be arranged in any area on the end solar cell 112 except where the delivery structures 108 are arranged.Furthermore, the operational processes for disposing of the dispensing structures 108 and the strip films 104 do not conflict. In one process, the dispensing structures 108 and the strip films 104 can be arranged simultaneously using different devices.

[0080] Fig. 12 is a partial top view of the in Fig. 2 cell string group shown after arranging dosing structures. Fig. 13 is a partial top view of the in Fig. 3 cell string group shown after arranging dosing structures.

[0081] It should be noted that with further reference to Fig. 12 and Fig. 13 In addition to the arrangement of a dispensing structure 108 at an end 1031 of a corresponding solder strip 103 without an arranged strip film 104, a dispensing structure 108 can also be arranged in an area of ​​a corresponding second solder strip 123 outside the end 1031 and in an area of ​​a connecting strip 133 outside the end 1031 in order to increase a fastening effect on the corresponding second solder strip 123 and the connecting strip 133.

[0082] In some embodiments, with reference to Fig. 12 For the output structure 108 that is not located at the end 1031 of the corresponding solder strip 103, the output structures 108 are evenly distributed on the corresponding second solder strip 123 or the corresponding connecting strip 133. That is, for a plurality of output structures 108 on the corresponding second solder strip 123 or the corresponding connecting strip 133, the distance between two corresponding output structures 108 that are adjacent to each other along the first direction X is nearly equal to the distance between two other corresponding output structures 108 that are adjacent to each other along the first direction X. It should be noted that in Fig. 12 Four output structures 108, arranged on the corresponding second solder strip 123 or the corresponding connecting strip 133, are taken as an example. In practical applications, the number of output structures arranged on the corresponding second solder strip or connecting strip is not limited; for example, it can be three, five, or six, etc.

[0083] In some embodiments, with reference to Fig. 13 for the output structures 108 which are not arranged at one end 1031 of a corresponding solder strip 103, the output structures 108 are arranged facing the edge of a corresponding solar cell 102.

[0084] In some embodiments, with reference to Fig. 10, 14 to 16, the width of the respective solder strip 103 in the second direction Y (i.e., a first width W1) is less than the width of the respective strip film 104 in the second direction Y (i.e., a second width W2). The second width W2 is greater than or equal to the width of a respective mounting film 106 of the mounting films 106 in the first direction X (i.e., a third width W3).

[0085] Fig. Figure 14 shows a partial cross-sectional view of the photovoltaic module in Fig. 10 along a first cross-sectional direction AA1. Fig. Figure 15 shows another partial cross-sectional view of the photovoltaic module in Fig. 10 along the first cross-sectional direction AA1. Fig. Figure 16 shows a partial cross-sectional view of the photovoltaic module in Fig. 10 along a second cross-sectional direction BB1. It should be noted that Fig. Figure 16 illustrates that the respective strip film 104 and the corresponding fastening film 106 are formed in one piece, and the respective strip film 104 and the corresponding fastening film 106 are roughly divided by dashed lines.

[0086] It is worth noting that the first width W1 is defined as smaller than the second width W2, which is advantageous for further ensuring coverage of the respective strip film 104 on the second solder strip 123, thereby improving the insulating effect of the respective strip film 104 on the second solder strip 123. Furthermore, the second width W2 is defined as being greater than or equal to the third width W3, which is advantageous for minimizing the number of mounting films 106 used to attach the corresponding solder strip 103 without the corresponding strip film 104, thereby further reducing the manufacturing costs of the photovoltaic module.

[0087] In some examples, the respective solder strip 103 can be a flat solder strip or a round solder strip. The flat solder strip has a square-like cross-sectional shape, and the round solder strip has a circular or elliptical cross-sectional shape. The first width W1 of the respective solder strip 103 can refer to a dimension of the flat solder strip along the second direction or to a diameter of the round solder strip. In some examples, the first width W1 can be 1.5 mm.

[0088] In some examples, the second width W2 of the respective strip film 104 can be 2 mm to 2.2 mm, such as 2 mm, 2.05 mm, 2.1 mm, 2.15 mm or 2.2 mm, etc.

[0089] In some examples, the third width W3 of the respective mounting film 106 can be 1.5 mm to 2 mm, such as 1.5 mm, 1.55 mm, 1.6 mm, 1.65 mm, 1.7 mm, 1.75 mm, 1.8 mm, 1.85 mm, 1.9 mm, 1.95 mm or 2 mm etc.

[0090] In some embodiments, with reference to Fig. 10 or Fig. 11. Each solder strip 103 has two ends 1031 along the first direction X. The photovoltaic module can further include elongated mounting films 106 extending along the second direction Y. The mounting films 106 are arranged at a plurality of ends 1031 spaced apart along the second direction Y. At least two mounting films 106 are arranged on each solar cell 102. Thus, each mounting film 106 is configured to secure a corresponding solder strip 103 of the plurality of solder strips 103 without a strip film 104. It is worth noting that when the busbar 105 is subsequently arranged, the busbar 105 can be positioned in any area on the end solar cell 112 except where the respective mounting film 106 is located.

[0091] In some embodiments, with reference to Fig. 17 and Fig. 13 Fig. Figure 17 shows a schematic partial cross-sectional diagram of a strip film in a photovoltaic module, which is provided in some embodiments of the present disclosure. The respective strip film 104 can include a first adhesive film 114, an insulating film 124, and a second adhesive film 134, which are stacked along the third direction Z. The first adhesive film 114 is bonded to a corresponding solder strip 103 and a corresponding solar cell 102. Along the third direction Z, a second thickness H2 of the insulating film 124 is greater than or equal to a first thickness H1 of the first adhesive film 114, and the second thickness H2 of the insulating film 124 is greater than a third thickness H3 of the second adhesive film 134. The third direction Z is a thickness direction of a respective solar cell 102 of the plurality of solar cells 102.

[0092] It is worth noting that the first adhesive film 114 is primarily configured for attaching the respective strip film 104 to the corresponding solder strip 103 and the corresponding solar cell 102, and the insulation performance requirements for the respective strip film 104 are not high; the second adhesive film 134 is primarily used to attach the strip film 104 to the busbar 105, and its insulation performance requirements are not high. The insulating film 124 is primarily configured for insulating between the corresponding second solder strip 123 and the busbar 105.Thus, the second thickness H2 of the insulating film 124 is defined as greater than or equal to the first thickness H1 of the first adhesive film 114, and the second thickness H2 is defined as greater than the third thickness H3 of the second adhesive film 134. This is advantageous for minimizing the manufacturing costs of the first adhesive film 114 and the second adhesive film 134, while still providing the necessary insulating effect of the insulating film 124 and the adhesive performance of both the first adhesive film 114 and the second adhesive film 134. Furthermore, the first adhesive film 114, unlike the second adhesive film 134, must simultaneously bond the corresponding solder strip 103 and the corresponding solar cell 102. The first adhesive film 114 is thicker than the second adhesive film 134, which further improves the bonding effect of the first adhesive film 114 to the corresponding solder strip 103 and the corresponding solar cell 102.

[0093] In some embodiments, with reference to Fig. 17 a ratio of the first thickness H1, the second thickness H2 and the third thickness H3 in a range of (3~4):(4~5):(1~2) such as 4:4:2.

[0094] In some embodiments, with reference to Fig. 17 a thickness H4 of the respective strip film 104 in the third direction Z in a range of 280µm to 320µm, such as 280µm, 285µm, 290µm, 295µm, 300µm, 305µm, 310µm, 315µm or 320µm, etc.

[0095] In some embodiments, referring to Fig. 14 Each busbar 105 of the busbars 105 has a plurality of slots 115, which are defined at intervals along the second direction Y and on the sides of the respective busbar 105. The first solder strips 113 run through the plurality of slots 115.

[0096] Thus, by covering the first solder strips 113 with the plurality of grooves 115, a top surface and a side surface of a corresponding first solder strip 113 are brought into contact with the respective busbar 105 as far as possible, thereby increasing the contact area between the respective busbar 105 and the corresponding first solder strip 113 and reducing the contact resistance between them.Furthermore, since the respective strip film 104 is arranged on the array of multiple rows of second solder strips 123, and a surface of a corresponding solar cell 102, on which a multiple of solder strips 103 are arranged, is defined as the reference surface, the arrangement of the respective strip film 104 causes a region of the respective busbar 105 directly opposite the array of multiple rows of second solder strips 123 to have a greater height than a region of the respective busbar 105 directly opposite the first solder strips 113. Thus, the first solder strips 113 run through the multiple slots 115.This means that the cross-sectional shape of the respective busbar 105 along the second direction Y and the third direction Z is defined as a non-uniform strip shape, which helps to reduce the risk of bending of the respective busbar 105 due to a height difference caused by the respective strip film 104, thereby reducing the risk of microcracks in the multitude of solar cells 102 caused by uneven force when arranging the busbars 105, in order to further improve the yield of the photovoltaic module.

[0097] In some embodiments, with reference to Fig. 15, the photovoltaic module further includes conductive blocks 107. Each conductive block 107 is arranged between a first solder strip 113 and a corresponding busbar 105. The respective conductive block 107 is arranged on a side of a first solder strip 113 that faces away from the plurality of solar cells 102.

[0098] It is worth noting that, since the respective strip film 104 is arranged on the array of multiple rows of second solder strips 123, and the surface of the corresponding solar cell 102, on which the multiple rows of solder strips 103 are arranged, is defined as the reference surface, the arrangement of the respective strip film 104 causes a region of the respective busbar 105 directly opposite the array of multiple rows of second solder strips 123 to have a greater height than a region of the respective busbar 105 directly opposite the first solder strip 113. Thus, the respective conductive block 107 is arranged on a side of a first solder strip 113 facing away from the multiple rows of solar cells 102, thereby compensating for a height difference between the regions in the corresponding busbar 105 directly opposite the first solder strip 113 and a corresponding second solder strip 123.In other words, the top surface of an entire assembly formed by the first solder strip 113 and the corresponding conductive block 107, facing away from the reference surface, is almost flush with the top surface of an entire assembly formed by the corresponding second solder strip 123 and a corresponding strip film 104, also facing away from the reference surface. This allows the busbar 105 to be a flat strip structure, positioned facing away from the corresponding solder strip 103 along the sides of both the conductive block 107 and the corresponding strip film 104. Thus, a good electrical connection between the corresponding first solder strip 113 and the busbar 105 can be achieved by means of the conductive block 107, and the risk of the corresponding busbar 105 bending due to the height difference caused by the corresponding strip film 104 can be reduced.This reduces the risk of microcracks in the corresponding solar cell 102 caused by uneven force when arranging the busbar 105, thereby further improving the yield of the photovoltaic module.

[0099] In some embodiments, the respective conductive block 107 may be made of solder paste.

[0100] In some embodiments, the photovoltaic module can be described with reference to Fig. 18 and Fig. 19 further include a front encapsulation film 118, which is arranged on one side of the cell string group 100 facing away from the plurality of solder strips 103, and a rear encapsulation film 128, which is arranged on one side of the cell string group 100 facing towards the plurality of solder strips. The rear encapsulation film 128 has a degree of pre-crosslinking that is greater than that of the front encapsulation film 118, and the degree of pre-crosslinking of the rear encapsulation film 128 is 30% to 50%.

[0101] Fig. Figure 18 is a schematic three-dimensional partial diagram of a cell string in a photovoltaic module, which is provided in some embodiments of the present disclosure. Fig. Figure 19 is a schematic partial cross-sectional diagram of a photovoltaic module, provided in some embodiments of the present disclosure. It should be noted that the front encapsulation film 118 and the rear encapsulation film 128 have a boundary line between them before lamination. After lamination, the front encapsulation film 118 and the rear encapsulation film 128 no longer have a clear boundary line between them; that is, the front encapsulation film 118 and the rear encapsulation film 128 have formed an integral encapsulation film. Based on this, a relative positional relationship between the front encapsulation film 118 and the rear encapsulation film 128 and the plurality of solar cells 102 is roughly indicated by dashed lines in Figure 1. Fig. subdivided into 19.

[0102] It is worth noting that during the lamination process, the front encapsulation film 118 flows primarily downwards to cover the surfaces of the array of solar cells 102, particularly to fill minute gaps around grid lines in the front encapsulation film 118 and prevent the formation of air bubbles. The front encapsulation film 118 can also form a uniform, dense, and stress-free protective layer that prevents the at least one cover plate on one side of the front encapsulation film 118, facing away from the array of solar cells 102, from directly exerting mechanical stress on the front encapsulation film 118, while simultaneously providing insulation and adhesion. Furthermore, the degree of pre-dislocation of the array of solar cells 102 is designed to be greater than that of the front encapsulation film 118, giving the front encapsulation film 118 better flow properties than the rear encapsulation film 128.The low-flow rear encapsulation film 128 can effectively prevent excessive overflow of the compressed front encapsulation film 118, thereby enclosing an adhesive around the multitude of solar cells 102 and between the multitude of solar cells 102 and the rear encapsulation film 128, ultimately forming a photovoltaic module with uniform thickness and smooth surface.

[0103] Furthermore, the degree of pre-crosslinking of the rear encapsulation film 128 is designed to be between 30% and 50% to control its flowability within a suitable range. This protects the surface of a corresponding solar cell 102 while preventing the rear encapsulation film 128 from flowing between a solder strip 103 (without a corresponding strip film 104) and the corresponding solar cell 102, thus ensuring a good electrical connection between the solder strip 103 and the corresponding solar cell 102. It is worth noting that the solder strip 103 (without the corresponding strip film 104) can be directly covered by the rear encapsulation film 128 during lamination, or the solder strip 103 (without the corresponding strip film 104) can be secured by a suitable mounting film or delivery structure before being covered by the rear encapsulation film 128.

[0104] In some embodiments, at least one of the front encapsulation film 118 and the rear encapsulation film 128 can be an organic encapsulation film such as a polyvinyl butyral film (PVB film), an ethylene vinyl acetate copolymer film (EVA film), a polyolefin elastomer film (POE film), or a polyethylene terephthalate film (PET film). Alternatively, at least one of the front encapsulation film 118 and the rear encapsulation film 128 can also be an EP film, an EPE film, or a PVP film. The EP film refers to a coextruded film composed of stacked EVA and POE films. The EPE film is a coextruded film formed by sequentially stacking the EVA film, the POE film, and the EVA film. The PVP film is a co-extruded film formed by stacking the POE film, the EVA film, and the POE film.Co-extruded films can be produced by successively extruding one or more materials onto another pre-made film during film production, or by bonding different types of pre-made films together.

[0105] In some embodiments, with reference to Fig. 19 The photovoltaic module further includes at least one cover plate 109, which may be a glass cover, a plastic cover, or another cover plate with a translucent function. A surface of each cover plate of the at least one cover plate 109, facing the at least one encapsulation film formed by the front encapsulation film 118 and the rear encapsulation film 128, may be an uneven surface or a textured surface containing a plurality of protruding structures, thereby increasing the utilization rate of incident light. The at least one cover plate 109 may include a first cover plate facing the front encapsulation film 118 and a second cover plate facing the rear encapsulation film 128.

[0106] In some embodiments, with reference to Fig. Figure 20, which is a seventh partial top view of a photovoltaic module provided in some embodiments of the present disclosure, shows at least two cell string groups 100 arranged at intervals along the second direction Y. The busbars 105 include end busbars 105 located on the third end cell of the first cell string and the fourth end cell of the second cell string. The end busbars 105 extend along the second direction Y. The end busbars 105 are further electrically connected to another cell string group 100 that is adjacent to the cell string group 100 in the second direction Y. In other words, the two cell string groups 100 can share the end busbar 105 to further simplify the manufacturing process of the photovoltaic module, thereby reducing the process difficulty and manufacturing costs of the photovoltaic module.

[0107] In some embodiments, with reference to Fig. 21 Fig. 21 A schematic partial cross-sectional diagram of an electrical connection of busbars in different cell string groups in a photovoltaic module, which is provided in some embodiments of the present disclosure. In the two cell string groups 100, with reference to Fig. 20 The end busbars 105 are arranged separately in the two cell string groups 100. Then a stack welding process is applied, that is, a welding block 119 is arranged at two adjacent ends of two end busbars 105. During lamination, the welding block 119 is welded to the two adjacent ends by low-temperature welding in order to realize the electrical connection of the two corresponding busbars 105.

[0108] In some embodiments, when the welding block 119 is welded to the two adjacent ends of the two end busbars 105 using low-temperature welding, the welding temperature for low-temperature welding may be 150 °C~160 °C, such as 150 °C, 151 °C, 152 °C, 153 °C, 154 °C, 155 °C, 156 °C, 157 °C, 158 °C, 159 °C or 160 °C, etc.

[0109] In some embodiments, with reference to Fig. 8 and Fig. 20 The end busbars 105, which are arranged on the third end solar cell 112 and the fourth end solar cell 112, along the second direction Y. The end busbars 105 are electrically connected to another cell string group that is adjacent to the cell string group 100 in the second direction Y. Furthermore, the first and second cell strings 101 within the cell string group 100 do not share the end busbars 105, so that diodes between the cell string groups 100 and the other cell string group 100 can be electrically connected by the stack welding process. It should be noted that in Fig. 8 a parallel connection of the first and second cell strings 101 within the cell string group 100 via the bus bars 105 is taken as an example.

[0110] Furthermore, the cell string groups 100 and the other cell string group that share the end busbars 105 form a battery module 10. The photovoltaic module can also include at least two battery modules 10 connected in series along the second direction Y, and the at least two battery modules 10 include at least a first battery module 10 and a second battery module 10. In addition, to achieve a series connection between one battery module 10 and another battery module 10 adjacent to the first battery module 10, the end busbars 105 can be electrically connected to a cell string group 100 of the first battery module 10 and a corresponding cell string group 100 of the second battery module 10. It should be noted that Fig. Figure 8 shows a battery module 10 indicated by a dashed box and takes as an example a photovoltaic module that includes three battery modules 10 connected in series along the second direction Y.

[0111] In some embodiments, referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7. Each cell string 101 comprises a plurality of solar cells 102 connected in series and spaced apart from each other by a gap. The gap is very small compared to the size of each individual solar cell 102 in the plurality of solar cells 102 along the first direction X. In other words, the plurality of solar cells 102 in the respective cell string 101 can be arranged at small intervals.

[0112] In some embodiments, the respective cell string 101 can include a plurality of solar cells connected in series and arranged without gaps. For example, the plurality of solar cells can be arranged in a stacked manner, meaning that the edges of any two adjacent solar cells of the plurality of solar cells overlap; or the plurality of solar cells can be arranged with zero gaps, meaning that the edges of any two adjacent solar cells are in contact.

[0113] In summary, for the cell string group 100, the respective strip film 104 is designed to be arranged on the multiple rows of second solder strips 123. The respective strip film 104 can simultaneously secure and insulate the multiple rows of second solder strips 123, thereby simplifying the operation of the busbar 105 and thus reducing the manufacturing difficulty of the photovoltaic module. Furthermore, since the respective strip film 104 is arranged along the entire length of the second end solder strips 123 on the multiple end solar cells 112 along the first direction X, the busbars 105 can be arranged in any region of the multiple end solar cells 112 along the first direction X.In other words, it is not necessary to consider the alignment error between the busbars 105 and the multitude of end solar cells 112, thus effectively avoiding the problem of faulty contact between the busbars 105 and the multiple rows of second solder strips 123, thereby further improving the yield of the photovoltaic module. This design of the respective strip film 104 enables both reduced manufacturing difficulty and improved yield of the photovoltaic module. Furthermore, since the respective strip film 104 corresponds to the entire cell string group 100, it can be applied to the full-frame photovoltaic module without requiring a specific length of the cell string group 100 along the first direction X.In addition, targeted placement of the respective strip film 104 in specific areas of the cell string group 100 reduces the coating costs due to the smaller quantity of the multitude of strip films 104 used, thereby reducing the overall cost of the photovoltaic module.

[0114] A person skilled in the art can understand that the above embodiments are particular embodiments for implementing the present disclosure, and that in practical application various changes to the form and details can be made without departing from the spirit and scope of protection of the embodiments of the present disclosure. Persons skilled in the art can make variations or modifications without departing from the spirit and scope of protection of the embodiments of the present disclosure; therefore, the scope of protection of the embodiments of the present disclosure is subject to the scope of protection as defined by the claims.

Claims

Photovoltaic module comprising: a cell string group (100) comprising a first cell string (111) and a second cell string (121) arranged along a first direction (X), wherein each cell string (101) of the first and second cell strings (111, 121) comprises a plurality of solar cells (102) connected in series along the first direction (X), and the plurality of solar cells (102) comprises two end solar cells (112) at opposite ends of the respective cell string (101); a plurality of solder strips (103) extending in the first direction (X) and formed in rows of solder strips arranged at intervals along a second direction (Y), wherein each row of solder strips comprises a respective row of solder strips (103) arranged at intervals along the first direction (X), wherein the plurality of solder strips (103) comprise first solder strips (113) and second solder strips (113). (123) includes,a respective first solder strip (113) of the first solder strips (113) is configured to electrically connect the end solar cells (112); a respective second solder strip (123) of the second solder strips (123) is configured to electrically connect a pair of adjacent solar cells (102) in one of the first and second cell strings (111, 121), whereby a first end solar cell (112) is electrically connected to a second end solar cell (112) by a respective plurality of first solder strips (113) of the first solder strips (113) arranged at intervals along the second direction (Y) on the first and second end solar cells (112), wherein the first end solar cell (112) and the second end solar cell (112) are adjacent to each other and are each end solar cells (112) of the first and second cell strings (111, 121); a plurality of strip films (104) which are arranged in extend in the first direction (X) and are arranged at intervals along the second direction (Y),wherein the plurality of strip films (104) includes strip films (104) which are each arranged on at least some of the solder strip rows, each solder strip row of the at least some of the solder strip rows being a row of second solder strips (123); and busbars (105) which are arranged on and connected to the plurality of strip films (104), each busbar (105) of the busbars (105) extending in the second direction Y and being electrically connected to and traversing each plurality of first solder strips (113) of the first solder strips (113). Photovoltaic module according to claim 1, wherein a pair of adjacent strip films (104) of the plurality of strip films (104) are spaced apart from each other by at least some of the first solder strips (113). Photovoltaic module according to claim 1, wherein the respective cell string (101) includes an even number of solar cells (102); and the plurality of solder strips (103) forms an arrangement with alternating first rows of solder strips (103) and second rows of solder strips (103) arranged at intervals along the second direction (Y), wherein each first row of the first rows of solder strips (103) includes a plurality of first solder strips (113) of the first solder strips (113) and a plurality of second solder strips (123) of the second solder strips (123), each second row of the second rows of solder strips (103) includes a plurality of second solder strips (123) of the second solder strips (123), and each strip film (104) of the plurality of strip films (104) is arranged on the plurality of second solder strips (123) of the respective second row of solder strips (103). Photovoltaic module according to claim 1, wherein the respective cell string (101) includes an odd number of solar cells (102); the plurality of solder strips (103) forms an arrangement with alternating first rows of solder strips (103) and second rows of solder strips (103) arranged at intervals along the second direction (Y), wherein each row of the first and second rows of solder strips (103) includes a plurality of first solder strips (113) of the first solder strips (113) and a plurality of second solder strips (123) of the second solder strips (123), and the plurality of second solder strips (123) of the respective row of solder strips (103) includes second end solder strips, each having an end section that is electrically connected to a corresponding end solar cell (112);and a respective strip film (104) of the plurality of strip films (104) is arranged on end sections of the second end solder strips of a first row of solder strips (103) and on a plurality of second solder strips (123) of a second row of solder strips (103) which is adjacent to the first row in the second direction (Y). Photovoltaic module according to claim 1, wherein the first cell string (111) includes an even number of solar cells (102) and the second cell string (121) includes an odd number of solar cells (102);the plurality of solder strips (103) forms an arrangement with alternating first rows of solder strips (103) and second rows of solder strips (103) arranged at intervals along the second direction (Y), wherein each first row of the first rows of solder strips (103) includes a first solder strip (113) and a plurality of second solder strips (123) of the second solder strips (123), each second row of the second rows of solder strips (103) includes a plurality of first solder strips (113) of the first solder strips (113) and a plurality of second solder strips (123) of the second solder strips (123), and the plurality of second solder strips (123) of each second row of solder strips (103) includes a second end solder strip having an end section electrically connected to an end solar cell (112) of the second cell string (121) that is spaced away from the first cell string (111);and a respective strip film (104) of the plurality of strip films (104) is arranged on a plurality of second solder strips (123) of a first row of solder strips (103) and on the end section of the second end solder strip of a second row of solder strips (103) which is adjacent in the second direction (Y) to the first row.; Photovoltaic module according to one of claims 1 to 5, including a plurality of connecting strips (133) for electrically connecting the first and second end solar cells (112), wherein each connecting strip (133) of the plurality of connecting strips (133) includes at least two first solder strips (113) of the plurality of first solder strips (113) for electrically connecting the first and second end solar cells (112), and the at least two first solder strips (113) are formed in one piece;and wherein the photovoltaic module further includes three busbars (105), the first cell string (111) further includes a third end solar cell (1121), the second cell string (121) further includes a fourth end solar cell (1122), one busbar (105) of the three busbars (105) is electrically connected to a plurality of first solder strips (113) arranged on the third end solar cell (1121), one busbar (105) of the three busbars (105) is electrically connected to the plurality of connecting strips (133), and one busbar (105) of the three busbars (105) is electrically connected to a plurality of first solder strips (113) arranged on the fourth end solar cell (1122). Photovoltaic module according to one of claims 1 to 5, wherein each solar cell (102) of the plurality of solar cells (102) includes first grid lines (122) and second grid lines (132) and a polarity of the first grid lines (122) differs from a polarity of the second grid lines (132); wherein the first grid lines (122) of the respective solar cell (102) are electrically connected to the second grid lines (132) of another solar cell (102) of the plurality of solar cells (102) that is adjacent to the respective solar cell (102) in the first direction (X), and the second grid lines (132) of the respective solar cell (102) are electrically connected to first grid lines (122) of the other solar cell (102);and wherein the first end solar cell (112) has an arrangement of first grid lines (122) and second grid lines (132) that is the same as an arrangement of first grid lines (122) and second grid lines (132) of the second end solar cell (102), and the first and second cell strings (111, 121) are connected in parallel, or the first end solar cell (112) has an arrangement of first grid lines (122) and second grid lines (132) that differs from an arrangement of first grid lines (122) and second grid lines (132) of the second end solar cell (112), and the first and second cell strings (111, 121) are connected in series. Photovoltaic module according to one of claims 1 to 5, further comprising elongated mounting films (106) extending along the second direction (Y), wherein the mounting films (106) traverse the ends of the plurality of solder strips (103) along the second direction (Y), and at least two mounting films (106) of the mounting films (106) are arranged on a respective solar cell (102) of the plurality of solar cells (102). Photovoltaic module according to claim 8, wherein a width of each solder strip (103) of the plurality of solder strips (103) in the second direction (Y) is less than a width of each strip film (104) in the second direction (Y), and the width of each strip film (104) is greater than a width of each mounting film (106) of the mounting films (106) in the first direction (X). Photovoltaic module according to one of claims 1 to 4, wherein each strip film (104) of the plurality of strip films (104) includes a first adhesive film (114), an insulating film (124) and a second adhesive film (134) stacked along a third direction (Z), and the first adhesive film (114) is connected to a corresponding solder strip (103) of the plurality of solder strips (103) and a corresponding solar cell (102) of the plurality of solar cells (102); and wherein in the third direction (Z) a thickness of the first adhesive film (114) is less than or equal to a thickness of the insulating film (124) and the thickness of the insulating film (124) is greater than a thickness of the second adhesive film (134). Photovoltaic module according to claim 10, wherein the ratio of the thickness of the first adhesive film (114), the thickness of the insulating film (124) and the thickness of the second adhesive film (134) is in a range of (3~4) : (4~5) : (1~2). Photovoltaic module according to claim 10, wherein the thickness of the respective strip film (104) in the third direction (Z) is in a range of 280 µm to 320 µm. Photovoltaic module according to one of claims 1 to 4, wherein a respective busbar (105) of the busbars (105) includes a plurality of slots (115) defined at intervals along the second direction (Y) and on sides of the respective busbar (105), and the first solder strips (113) pass through the plurality of slots (115) respectively. Photovoltaic module according to one of claims 1 to 4, further comprising conductive blocks (107), wherein a respective conductive block (107) of the conductive blocks (107) is arranged between a first solder strip (113) and a corresponding busbar (105) of the busbars (105). Photovoltaic module according to one of claims 1 to 4, further comprising a front encapsulation film (118) arranged on a side of the cell string group (101) facing away from the plurality of solder strips (103), and a rear encapsulation film (128) arranged on a side of the cell string group (101) facing the plurality of solder strips (103); wherein the rear encapsulation film (128) has a pre-crosslinking degree greater than the pre-crosslinking degree of the front encapsulation film (118), and the pre-crosslinking degree of the rear encapsulation film (128) is in the range of 30% to 50%. Photovoltaic module according to one of claims 1 to 4, comprising at least two cell string groups (101) arranged at intervals along the second direction (Y); wherein the first cell string (111) further includes a third end solar cell (1121), the second cell string (121) further includes a fourth end solar cell (1122), and the busbars (105) include end busbars arranged on the third end solar cell (1121) and the fourth end solar cell (1122); and wherein the end busbars extend along the second direction (Y) and are further electrically connected to another cell string group (101) adjacent to the cell string group (101) in the second direction (Y).

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