Photovoltaic module

Abstract

The application relates to the photovoltaic field and provides a photovoltaic module, which comprises a cell string layer and a back plate layer, the back plate layer is located on one side of the cell string layer, the cell string layer comprises a plurality of cell string columns, the cell string columns are arranged along a first direction, and each cell string column comprises two cell strings arranged along a second direction, the first direction and the second direction intersect, and the first direction and the second direction are perpendicular to the thickness direction of the photovoltaic module; a plurality of first bus bars are located at two ends of the cell string columns along the second direction, the first bus bars extend along the first direction; and a plurality of connecting parts are electrically connected with the first bus bars at two ends, respectively, and extend along the second direction. The photovoltaic module provided by the application can at least simplify a preparation process, improve a process yield and the reliability of the module.

Description

Technical Field

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

[0002] Throughout the development of modern solar energy technology, the development of high-power modules has always been a key focus of the industry. With the continuous increase in the pursuit of photoelectric conversion efficiency, the manufacturing of photovoltaic modules has become more complex, hindering large-scale industrial production and application. Summary of the Invention

[0003] This application provides a photovoltaic module that at least simplifies the manufacturing process, improves process yield, and enhances module reliability.

[0004] According to one aspect of the embodiments of this application, a photovoltaic module is provided, including a cell string layer and a backsheet layer, wherein the backsheet layer is located on one side of the cell string layer, wherein the cell string layer includes: a plurality of cell strings arranged along a first direction, and each cell string includes two cell strings arranged along a second direction, wherein the first direction and the second direction intersect, and the first direction and the second direction are perpendicular to the thickness direction of the photovoltaic module; a plurality of first busbars located at both ends of the cell strings along the second direction, the first busbars extending along the first direction; and a plurality of connecting portions, both ends of the connecting portions being electrically connected to the first busbars, and at least a portion of the connecting portions being located on the side of the backsheet layer away from the cell string layer, the connecting portions extending along the second direction.

[0005] Optionally, two battery strings in the same battery string array are connected in parallel, and two adjacent battery string arrays are connected in series or in parallel.

[0006] Optionally, at least one end of the connecting portion is directly connected to the first busbar at one end of the battery string, and the other end is directly connected to the first busbar at the other end of the battery string.

[0007] Optionally, the photovoltaic module further includes: at least one second busbar, one end of the second busbar being directly connected to the first busbar, the other end of the second busbar being directly connected to the connecting portion, and the second busbar extending along the second direction.

[0008] Optionally, the photovoltaic module further includes: a plurality of first photovoltaic junction boxes and a plurality of second photovoltaic junction boxes, wherein the first photovoltaic junction boxes are located on one side of the battery string along the second direction and are electrically connected to the first busbar, and the second photovoltaic junction boxes are located between two adjacent battery strings and are electrically connected to the second busbar.

[0009] Optionally, the first photovoltaic junction box and the second photovoltaic junction box each include a diode.

[0010] Optionally, the backplate layer has multiple through holes, and the connecting portion passes through the through holes to connect with the first busbar.

[0011] Optionally, the orthographic projection of the through hole on the backsheet layer is a first projection, the orthographic projection of the first busbar on the backsheet layer is a second projection, and the orthographic projection of the connecting portion on the backsheet layer is a third projection, wherein at least one of the first projections and the second projection or the third projection at least partially overlap.

[0012] Optionally, the photovoltaic module further includes: a plurality of third busbars located between two adjacent cell strings along the second direction, the third busbars extending along the first direction.

[0013] Optionally, the photovoltaic module further includes: a first encapsulating film layer located on the side of the cell string layer away from the backsheet layer; a cover plate layer located on the side of the first encapsulating film away from the cell string layer; and a second encapsulating film layer located between the cell string layer and the backsheet layer.

[0014] The technical solution provided in this application has at least the following advantages: by improving the circuit connection method and process flow of the components, eliminating internal jumpers and replacing them with external connection parts for circuit connection, reducing the internal insulation process, simplifying the manufacturing process, and improving the process yield and component reliability. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the drawings in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this application or in the conventional art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a photovoltaic module provided in the first embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the structure of a photovoltaic module provided in the second embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the structure of a photovoltaic module provided in the third embodiment of this application;

[0019] Figure 4 This is a schematic diagram of the structure of a photovoltaic module provided in the fourth embodiment of this application.

[0020] The above figures include the following reference numerals:

[0021] 10. Battery string layer; 101. Battery string; 103. Battery array; 20. First busbar; 25. Connector; 30. Third busbar; 35. Through hole; 40. Second busbar; 45. First photovoltaic junction box; 50. Second photovoltaic junction box; 15. Backsheet layer; 402. Conductive strip; 411. First encapsulating film layer; 413. Second encapsulating film layer; 42. Cover plate layer. Detailed Implementation

[0022] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0025] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0026] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0027] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0028] In the accompanying drawings corresponding to the embodiments of this application, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0029] In the description of the embodiments of this application, when a component "includes" another component, other components are not excluded unless otherwise stated, and other components may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly on" the other component (i.e., located on the surface of the other component with no other components between them), or another component may be present therein. Moreover, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located therein.

[0030] The terminology used in the description of the various embodiments described herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments and the appended claims, the term "foreword" is also intended to include the plural form unless the context clearly indicates otherwise. Components include layers, films, regions, or plates, etc.

[0031] The embodiments of this application will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this application to facilitate a better understanding of the application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0032] As is known from the background art, the design and manufacturing of jumpers in the prior art increases the production complexity and cost of the components, and may also introduce a series of quality problems. To solve the above problems, embodiments of this application provide a photovoltaic module, such as... Figure 1 and Figure 2 As shown, it includes: a battery string layer 10 and a backsheet layer, wherein the backsheet layer is located on one side of the battery string layer 10, wherein the battery string layer 10 includes: a plurality of battery strings 103, each of the battery strings 103 being arranged along a first direction D1, and each of the battery strings 103 including two battery strings 101 arranged along a second direction D2, wherein the first direction D1 and the second direction D2 intersect, and the first direction D1 and the second direction D2 are perpendicular to the thickness direction of the photovoltaic module.

[0033] Specifically, photovoltaic (PV) modules mainly consist of cell string layers and backsheet layers. The cell string layer is the core of the PV module's energy conversion, formed by strings of multiple solar cells connected in series or parallel. The backsheet layer is the back side of the PV module, and its main function is to protect the cell string layer and internal circuitry from damage by the external environment, while also enhancing the module's mechanical strength and stability.

[0034] Multiple first busbars 20, wherein the first busbars 20 are located at both ends of the battery string 103 along the second direction D2, and the first busbars 20 extend along the first direction;

[0035] Specifically, a busbar is a metal strip used to collect and conduct current, gathering the current generated by solar cells connected in series or parallel, and then leading it to an external circuit. In practical applications, the aforementioned first busbar corresponds to the edge busbar in a photovoltaic module, located at both ends of the solar cells.

[0036] Multiple connecting portions 25, with both ends of each connecting portion 25 electrically connected to the first busbar 20, and at least a portion of each connecting portion 25 located on the side of the backsheet layer away from the battery string layer 10, and the connecting portions 25 extending along the second direction D2.

[0037] Specifically, both ends of the connector are electrically connected to the first busbar. This means that the connector acts as a bridge connecting the first busbars, linking the first busbars collected from each battery string, thus achieving electrical series or parallel connection between the battery strings within the module. This connection method is particularly important for multi-segment module designs because it directly affects the module's electrical performance and power output. In practical applications, the material of the connector can be the same as or different from the material of the first busbar, as long as the material of the connector is conductive, such as metal wires, conductive strips, or other conductive materials.

[0038] The photovoltaic module of this application includes a cell string layer and a backsheet layer, with the backsheet layer located on one side of the cell string layer. The cell string layer includes: multiple cell strings arranged along a first direction, and each cell string includes two cell strings arranged along a second direction, wherein the first and second directions intersect and are perpendicular to the thickness direction of the photovoltaic module; multiple first busbars located at both ends of the cell strings along the second direction, extending along the first direction; and multiple connecting portions, with both ends electrically connected to the first busbars, extending along the second direction. By improving the module's circuit connection method and process flow, internal jumpers are eliminated, and circuit connections are made externally using connecting portions, reducing the internal insulation process, simplifying the manufacturing process, and improving process yield and module reliability.

[0039] In some other embodiments, such as Figure 3 As shown, two battery strings 101 within the same battery string array are connected in parallel, and two adjacent battery strings are connected in series or parallel. This electrical connection method, combining the parallel connection of battery strings 101 with the series / parallel connection of battery strings, allows the module to increase its current carrying capacity while maintaining overall voltage output, thereby improving the module's power output. Simultaneously, by connecting the battery strings 101 in parallel, the module's tolerance to partial shading can be improved; when part of the module is shaded, the unaffected portion can still continue to operate, reducing the overall performance degradation.

[0040] In practical applications, each battery string consists of two battery strings arranged along the second direction, meaning that these two strings are connected in parallel within the same battery string. Parallel connection means that the two battery strings share the same voltage, but the current can be split between them, thus increasing the overall current carrying capacity of the module. This design reduces the current on individual cells, lowers the cell's own electrical losses and heat accumulation, and helps improve the module's photoelectric conversion efficiency and operational stability. The connection between adjacent battery strings can be either series or parallel. A series connection means connecting multiple battery strings end-to-end, with the voltages of each battery string superimposed to ultimately output a high voltage. A parallel connection, on the other hand, connects the positive and negative terminals of the battery strings together, allowing the current to be split among the multiple battery strings, ultimately outputting a large current. The choice between these two connection methods depends on the specific design goals of the module. For example, high voltage output is suitable for long-distance power transmission and high-voltage inverters, while high current output is more suitable for local power grids and low-voltage inverter applications.

[0041] In some other embodiments, such as Figures 1 to 3 As shown, at least one end of the aforementioned connecting portion 25 is directly connected to the first busbar 20 at one end of the aforementioned battery string, and the other end is directly connected to the first busbar 20 at the other end of the aforementioned battery string. The photovoltaic module also includes: a plurality of second photovoltaic junction boxes 50, the second photovoltaic junction boxes 50 being located between two adjacent aforementioned battery strings 101. Compared with the complex jumper connections inside traditional modules, the direct connection design simplifies the internal electrical wiring of the module, reduces the number of connection points inside the module, lowers the probability of electrical defects occurring during the module's production process, and improves the overall process yield and product quality.

[0042] In practical applications, in the circuit design of photovoltaic modules, "direct connection" between electrical components usually means that there are no additional intermediaries or parts, and current can flow directly and seamlessly from one component to another. In this invention, the direct connection between the connector and the first busbar means that the current flow path between the battery string and the external circuit is shortened and simplified as much as possible, thereby reducing circuit resistance and energy loss and improving current transmission efficiency. At least one end of the connector is directly connected to the first busbar at one end of the battery string, while the other end is directly connected to the first busbar at the other end of the battery string. This means that the connector directly leads the current collected by two parallel battery strings inside the battery string to the external circuit system of the module without the need for multiple internal jumper connections.

[0043] In some other embodiments, such as Figure 1 and Figure 2As shown, the photovoltaic module further includes at least one second busbar 40, one end of which is directly connected to the first busbar 20, and the other end of which is directly connected to the connection portion 25. The second busbar 40 extends along the second direction D2. By adding the second busbar 40 to optimize current distribution and collection, the power output capability of the module can be improved.

[0044] In practical applications, one end of the second busbar is directly connected to the first busbar, and the other end is directly connected to the connector. This "direct connection" means there are no additional intermediary components, resulting in the shortest current path, highest transmission efficiency, and reduced potential electrical connection failure points. The second busbar extends along the aforementioned second direction, that is, parallel to either the length or width direction of the component. Furthermore, the length of the second busbar ranges from 20 to 800 mm. That is, the length of the second busbar can be any one of 20 mm, 80 mm, 150 mm, 250 mm, 280 mm, 320 mm, 360 mm, 400 mm, 450 mm, 550 mm, 680 mm, 720 mm, or 800 mm, or any value within the range of any two of the aforementioned values. In practical applications, the length of the second busbar is less than the length of the connector.

[0045] In some other embodiments, such as Figure 1 and Figure 2 As shown, the backsheet layer has multiple through holes 35, through which the connecting portion 25 passes and connects to the first busbar 20. The direct connection path between the connecting portion 25 and the first busbar 20 reduces the length of internal electrical connections, thereby further reducing internal resistance and energy loss due to current transmission, thus further improving the overall efficiency of the component. The direct connection of the connecting portion through the through holes 35 in the backsheet layer to the first busbar reduces internal connection points, lowering the risk of electrical faults caused by poor connections or excessive contact resistance, thereby further improving the reliability and stability of the component.

[0046] In practical applications, a through-hole refers to an opening structure on the backsheet layer. Its design purpose is to allow electrical connections to pass through the backsheet and directly establish an electrical connection with the first busbar located on one side of the cell string layer. This design avoids the problems caused by complex jumper connections within traditional modules, such as limited internal space, difficulty in effective encapsulation, and an increase in potential electrical failure points. By creating through-holes on the backsheet, the connection can directly exit from the back of the module, forming the shortest and most direct connection path with the first busbar. In practical applications, the average aperture of the aforementioned through-holes ranges from 6 to 14 mm. That is, the average aperture of the aforementioned through-holes can be any one of 6 mm, 8 mm, 10 mm, 12 mm, and 14 mm, or any value within the range of any two of the aforementioned values. The apertures of the aforementioned through-holes can be the same or different. The average aperture of the aforementioned through-holes is the average of the apertures of multiple aforementioned through-holes; that is, the aperture of some of the aforementioned through-holes may be outside the range of the aforementioned average aperture.

[0047] In some embodiments, the orthographic projection of the through-hole on the backsheet layer is a first projection, the orthographic projection of the first busbar on the backsheet layer is a second projection, and the orthographic projection of the connection portion on the backsheet layer is a third projection. At least one of the first projections at least partially overlaps with the second or third projection. The positional relationship between the through-hole, the first busbar, and the connection portion can further ensure that the connection portion can complete current transmission with the shortest distance and the lowest resistance, thereby further reducing power loss and further improving the electrical performance of the component. At the same time, the overlapping method can also further reduce errors in the connection process and improve the reliability of the electrical connection.

[0048] In practical applications, the first projection overlaps at least partially with the second projection or the third projection, that is, the first projection overlaps at least partially with the second projection, meaning the through hole is located directly below at least part of the first busbar; or, the first projection overlaps at least partially with the third projection, meaning the through hole is located directly below at least part of the connection portion.

[0049] In some other embodiments, such as Figure 2 As shown, the photovoltaic module also includes a plurality of third busbars 30, which are located between two adjacent cell strings along the second direction D2 and extend along the first direction D1. The third busbars can quickly collect the current generated by each pair of adjacent cell strings, reducing the distance the current travels within the cell strings, thereby reducing resistance and energy loss during current transmission and improving the module's power conversion efficiency.

[0050] In practical applications, the third busbar is an auxiliary current-collecting element used to establish a direct electrical connection between two adjacent cell strings along the second direction. Extending along the first direction, its main function is to collect the current generated by the cell strings arranged along the second direction and laterally converge it onto the longer first busbar, or directly connect it to an external connection point to guide the current to other parts of the photovoltaic system. This layout helps to achieve uniform current distribution, reduces energy loss caused by excessive distance during current transmission, and also balances the potential between the cell strings, improving the overall electrical performance of the module. The material of the third busbar is the same as that of the first and fourth busbars.

[0051] In some other embodiments, such as Figure 1 and Figure 2 As shown, the photovoltaic module also includes: multiple first photovoltaic junction boxes 45 and multiple second photovoltaic junction boxes 50. The first photovoltaic junction boxes 45 are located on one side of the aforementioned battery string 103 along the aforementioned second direction D2 and are electrically connected to the aforementioned first busbar 20. The second photovoltaic junction boxes 50 are located between two adjacent battery strings 101 and are electrically connected to the aforementioned second busbar 40. By setting junction boxes at the edge and inside of the module, the internal structure of the module can be optimized, reducing the manufacturing difficulty and potential failure points caused by the complex internal circuit design, and enhancing the structural strength and environmental adaptability of the module. In addition, compared with the junction box design in the prior art, the junction boxes in this solution are smaller in size, thereby further reducing the shading of the solar cells.

[0052] In some embodiments, the first photovoltaic junction box and the second photovoltaic junction box each include a diode. The presence of the diode can optimize the current flow path inside the module, allowing the current to be transferred more efficiently from the cell string to the junction box, and then output from the junction box to the photovoltaic system, reducing losses during current transmission and improving the electrical efficiency of the module.

[0053] In practical applications, especially in multi-cell photovoltaic module designs, diodes can electrically isolate different cells of the module. Even if one cell is affected by shading or malfunctions, the other cells can still operate normally and will not be affected by reverse current. This keeps the module's total output voltage and current relatively stable, improving system availability. Built-in diodes in photovoltaic junction boxes can prevent reverse current caused by partial cell shading or malfunctions. Such reverse current could damage other normally functioning cells or reduce the overall efficiency of the module.

[0054] like Figure 4 As shown, the photovoltaic module described in this application also includes:

[0055] The first encapsulating film layer 411 is located on the side of the battery string layer 10 away from the backsheet layer 15.

[0056] The first encapsulation film layer typically uses highly transparent and weather-resistant materials such as EVA or POE. These materials not only have good optical properties, ensuring high light transmittance, but also excellent adhesion and mechanical strength, enabling them to form a strong bond with the glass and solar cells under high temperature and pressure, ensuring the long-term stability of the module.

[0057] The cover layer 42 is located on the side of the first encapsulating film layer 411 away from the battery string layer 10.

[0058] Specifically, the cover layer can be made of light-transmitting materials such as glass or plastic. Furthermore, the surface of the cover layer facing the encapsulation layer can be uneven, thereby increasing the utilization rate of incident light. The cover layer includes a first cover plate and a second cover plate, the first cover plate being disposed opposite to the first encapsulation layer, and the second cover plate being disposed opposite to the second encapsulation layer.

[0059] The second encapsulating film layer 413 is located between the battery string layer 10 and the backsheet layer 15.

[0060] The primary function of the second encapsulating film layer is to encapsulate the cell string layer, tightly bonding the cells to the backsheet layer to form a sealed internal environment that protects the cells from external environmental factors. During the encapsulation process, the film melts under high temperature and pressure, filling the gaps between the cells and the backsheet, and provides robust physical and chemical protection after curing. EVA film is one of the most commonly used materials for photovoltaic module encapsulation. It possesses excellent light transmittance, adhesion, and weather resistance. At high temperatures, EVA film melts and bonds to the cells and backsheet, forming a stable encapsulation layer after cooling and curing.

[0061] In practical applications, the photovoltaic module also includes a conductive strip 402, which allows two adjacent cell strings to be electrically connected.

[0062] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0063] The photovoltaic module of this application includes a cell string layer and a backsheet layer, with the backsheet layer located on one side of the cell string layer. The cell string layer includes: multiple cell strings arranged along a first direction, and each cell string includes two cell strings arranged along a second direction, wherein the first and second directions intersect and are perpendicular to the thickness direction of the photovoltaic module; multiple first busbars located at both ends of the cell strings along the second direction, extending along the first direction; and multiple connecting portions, with both ends electrically connected to the first busbars, extending along the second direction. By improving the module's circuit connection method and process flow, internal jumpers are eliminated, and circuit connections are made externally using connecting portions, reducing the internal insulation process, simplifying the manufacturing process, and improving process yield and module reliability.

[0064] Those skilled in the art will understand that the above embodiments are specific examples of implementing this application, and in practical applications, various changes in form and detail can be made without departing from the spirit and scope of this application. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this application; therefore, the scope of protection of this application should be determined by the scope defined in the claims.

Claims

1. A photovoltaic module, characterized in that, The battery string layer includes a battery string layer and a backsheet layer, wherein the backsheet layer is located on one side of the battery string layer, and the battery string layer includes: Multiple battery strings are arranged along a first direction, and each battery string includes two battery strings arranged along a second direction, wherein the first direction and the second direction intersect, and the first direction and the second direction are perpendicular to the thickness direction of the photovoltaic module. Multiple first busbars, the first busbars being located at both ends of the battery string along the second direction, the first busbars extending along the first direction; Multiple connecting portions are provided, with both ends of each connecting portion electrically connected to the first busbar, and at least a portion of each connecting portion is located on the side of the backsheet layer away from the battery string layer. The connecting portions extend along the second direction, and the material of the connecting portions is different from the material of the first busbar. The photovoltaic module also includes: At least one third busbar, directly connected to the connection portion, extending along the second direction, the third busbar being used to establish a direct electrical connection between two adjacent battery strings along the first direction. The photovoltaic module further includes: a plurality of second busbars, the second busbars being located between two adjacent cell strings along the second direction, and the second busbars extending along the first direction. The photovoltaic module further includes: a first photovoltaic junction box and a second photovoltaic junction box. The first photovoltaic junction box is located on one side of the battery string array along the second direction and is electrically connected to the first busbar. The second photovoltaic junction box is located between two adjacent battery strings and is electrically connected to the second busbar. The first photovoltaic junction box and the second photovoltaic junction box each include a diode.

2. The photovoltaic module according to claim 1, characterized in that, Two battery strings in the same battery string array are connected in parallel, and two adjacent battery string arrays are connected in series or in parallel.

3. The photovoltaic module according to claim 1, characterized in that, At least one end of the connecting portion is directly connected to the first busbar at one end of the battery string, and the other end is directly connected to the first busbar at the other end of the battery string.

4. The photovoltaic module according to claim 1, characterized in that, The backplate layer has multiple through holes, and the connecting part passes through the through holes to connect with the first busbar.

5. The photovoltaic module according to claim 4, characterized in that, The orthographic projection of the through hole on the backsheet layer is a first projection, the orthographic projection of the first busbar on the backsheet layer is a second projection, and the orthographic projection of the connecting portion on the backsheet layer is a third projection. At least one of the first projections and the second projection or the third projection at least partially overlap.

6. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module also includes: The first encapsulating film layer is located on the side of the battery string layer away from the backsheet layer; The cover layer is located on the side of the first encapsulating film away from the battery string layer; The second encapsulating film layer is located between the battery string layer and the backsheet layer.

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