photovoltaic modules

Abstract

This utility model relates to a photovoltaic module, comprising a battery string, a solder strip, a spacer strip, and a busbar arranged sequentially; the busbar partially overlaps the battery string in the height direction; the spacer strip is disposed in the overlapping area between the busbar and the battery string; the solder strip connects the battery string and the busbar; the solder strip extends beyond the reserved length of the battery string by less than or equal to the reserved width of the busbar extending beyond the battery string. Using the above-mentioned photovoltaic module can reduce the risk of microcracks in the battery cells.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a photovoltaic module. Background Technology

[0002] In the existing photovoltaic module technology field, the layout design of busbars is one of the key factors affecting module performance and reliability. In traditional photovoltaic modules, busbars are usually placed between cell strings for current collection.

[0003] However, with the continuous advancement of photovoltaic technology, the size of solar cells is gradually increasing, while the overall size of the module is limited by various factors such as installation space and transportation conditions. This results in the spacing between cells in the limited module area being continuously reduced, which increases the risk of microcracks in the solar cells. Utility Model Content

[0004] Therefore, it is necessary to provide a photovoltaic module that addresses the problem of microcracks in existing solar cells.

[0005] A photovoltaic module includes a battery string, solder strips, spacer strips, and busbars arranged sequentially.

[0006] The busbar and the battery string partially overlap in the height direction; the isolation strip is disposed in the overlapping area between the busbar and the battery string;

[0007] The solder strip connects the battery string and the busbar; the solder strip extends beyond the reserved length of the battery string, but is less than or equal to the reserved width of the busbar extending beyond the battery string.

[0008] In one embodiment, the solder strip is a convex solder strip, and the raised area of ​​the solder strip is connected to the busbar.

[0009] In one embodiment, the raised area of ​​the convex weld strip includes mutually perpendicular straight line segments and arc transition segments connecting adjacent straight line segments.

[0010] In one embodiment, the busbar includes an edge busbar and a middle busbar; the middle busbar is disposed in the middle part of the photovoltaic module and partially overlaps with the adjacent cell string in the photovoltaic module in the height direction; the edge busbar partially overlaps with the edge cell string of the photovoltaic module in the height direction.

[0011] The width of the edge busbar is smaller than the width of the middle busbar.

[0012] In one embodiment, the adjacent battery strings include a first battery string and a second battery string; the intermediate busbar is symmetrically disposed between the first battery string and the second battery string.

[0013] In one embodiment, the isolation strip includes a first isolation strip disposed between the intermediate busbar and the first battery string; one side of the first isolation strip is aligned with the edge of the intermediate busbar in the width direction, and the other side is aligned with the edge of the first battery string.

[0014] In one embodiment, the edge busbar includes a head busbar disposed at the head of the photovoltaic module and a tail busbar disposed at the tail of the photovoltaic module.

[0015] In one embodiment, the width of the intermediate busbar is greater than or equal to twice the distance between the adjacent battery strings.

[0016] In one embodiment, the width of the overlapping area between the edge busbar and the edge battery string is greater than or equal to the width of the edge busbar extending beyond the edge battery string.

[0017] In one embodiment, the portion of the edge busbar extending beyond the edge battery string is provided with a groove structure.

[0018] In the aforementioned photovoltaic modules, the isolation strip isolates the busbars and cell strings, reducing potential electrical interference and mechanical friction between them, thus improving the module's stability and reliability. Furthermore, the solder ribbon connecting the cell strings and busbars, with the ribbon extending beyond the pre-reserved length of the cell string but less than or equal to the pre-reserved width of the busbar extending beyond the cell string, ensures complete overlap between the pre-reserved ribbon and the busbar, reducing current fluctuations caused by poor contact. The busbars and cell strings partially overlap in the height direction, with the isolation strip positioned in the overlapping area between them. This layout changes the traditional design of placing the busbars between the cell strings. Through partial overlap in the height direction, the positions of each component are rationally planned within a limited space, expanding the extended area of ​​the cell strings and avoiding stress concentration problems caused by excessively small cell spacing, thereby effectively reducing the risk of microcracks in the cells. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a photovoltaic module in one embodiment;

[0020] Figure 2 This is a schematic diagram of the structure of the raised area of ​​the convex solder strip in one embodiment;

[0021] Figure 3 This is a schematic diagram of the photovoltaic module in another embodiment;

[0022] Figure 4 This is a schematic diagram of the structure of a photovoltaic module in yet another embodiment.

[0023] Explanation of icon numbers:

[0024] Battery string-1; Welding strip-2; Separator strip-3; Busbar-4; Edge busbar-41; Head busbar-411; Tail busbar-412; Middle busbar-42. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0031] See Figure 1 , Figure 1 The diagram shows a structural schematic of a photovoltaic module according to one embodiment of the present invention. The photovoltaic module includes a battery string 1, a solder strip 2, a spacer strip 3, and a busbar 4 arranged sequentially. The busbar 4 partially overlaps the battery string 1 in the height direction. The spacer strip 3 is disposed in the overlapping area between the busbar 4 and the battery string 1. The solder strip 2 connects the battery string 1 and the busbar 4. The solder strip 2 extends beyond the reserved length of the battery string 1, which is less than or equal to the reserved width of the busbar 4 extending beyond the battery string 1.

[0032] The photovoltaic (PV) module consists of multiple photovoltaic cells connected in a specific manner (e.g., series connection). The photovoltaic cells are the core power generation component of the PV module, converting solar energy into electrical energy. By connecting multiple cells in series, the output voltage of the battery string 1 can be increased to meet the voltage requirements of different applications. The solder ribbon 2 is a conductive material used to connect the cells and the busbar 4. It is typically made of a metal with good conductivity, such as copper, and may be plated with materials like tin to enhance solderability and conductivity. Its main function is to collect and transmit the current generated by the cells to the busbar 4. The insulating strip 3 is a strip-shaped material with insulating properties, placed in the overlapping area between the busbar 4 and the battery string 1. Its function is to prevent short circuits between the busbar 4 and the battery string 1, ensuring that the current flows along a predetermined path. It also provides mechanical isolation and buffering, reducing mechanical friction and stress transmission between the two. The busbar 4 is the component in the PV module used to collect and transmit current, and is typically made of a metal with good conductivity (such as copper or aluminum). It concentrates the current generated by each battery string 1 and outputs the electrical energy to the external circuit through the connecting cable, serving as an important bridge connecting the photovoltaic module to the external electrical system. The reserved length refers to the length beyond the edge of the battery string 1 when the solder strip 2 connects to the battery string 1 and the busbar 4. The reserved width refers to the width beyond the edge of the battery string 1 when the busbar 4 partially overlaps with the battery string 1 in the height direction.

[0033] Specifically, the photovoltaic module in this embodiment includes a battery string 1 composed of multiple photovoltaic cells connected in series. These cells, as the core power generation unit, can efficiently convert solar energy into electrical energy, while the battery string 1 formed by series connection can increase the output voltage to adapt to different power demand. To collect and transmit the current generated by the battery string 1, a crucial component, solder ribbon 2, is introduced. Solder ribbon 2 is generally made of metals with excellent conductivity, such as copper, and may be tin-plated on the surface to optimize soldering performance and conductivity. It precisely connects the battery string 1 and the busbar 4, ensuring that the current can flow smoothly from the battery string 1 to the busbar 4. The busbar 4, as the key hub for current collection and output, is usually made of conductive metals such as copper or aluminum. It bears the responsibility of concentrating the current from each battery string 1 and transmitting it to the external circuit through connecting cables, serving as a bridge tightly connecting the photovoltaic module and the external electrical system. In terms of structural design, the busbar 4 and the battery string 1 partially overlap in the height direction. This layout achieves optimized functional integration within a limited space. In the overlapping area between busbar 4 and battery string 1, a dedicated isolation strip 3 is installed. Isolation strip 3 possesses excellent insulation properties, effectively preventing short circuits between busbar 4 and battery string 1, ensuring stable current flow along the predetermined path. It also serves as mechanical isolation and buffering, reducing mechanical friction and stress transmission between the two, thus preventing damage to the battery cells due to mechanical forces. Furthermore, there are strict requirements for the placement of the solder ribbon 2. The length of solder ribbon 2 extending beyond the battery string 1 must be less than or equal to the width of busbar 4 extending beyond the battery string 1. This design ensures that the reserved solder ribbon 2 fully overlaps with busbar 4, guaranteeing both a good electrical connection and enhanced mechanical stability, contributing to improved reliability and power generation efficiency of the entire photovoltaic module.

[0034] In the aforementioned photovoltaic modules, the isolation strip isolates the busbars and cell strings, reducing potential electrical interference and mechanical friction between them, thus improving the module's stability and reliability. Furthermore, the solder ribbon connecting the cell strings and busbars, with the ribbon extending beyond the pre-reserved length of the cell string but less than or equal to the pre-reserved width of the busbar extending beyond the cell string, ensures complete overlap between the pre-reserved ribbon and the busbar, reducing current fluctuations caused by poor contact. The busbars and cell strings partially overlap in the height direction, with the isolation strip positioned in the overlapping area between them. This layout changes the traditional design of placing the busbars between the cell strings. Through partial overlap in the height direction, the positions of each component are rationally planned within a limited space, expanding the extended area of ​​the cell strings and avoiding stress concentration problems caused by excessively small cell spacing, thereby effectively reducing the risk of microcracks in the cells.

[0035] In one embodiment, the solder strip is a convex solder strip, and the raised area of ​​the solder strip is connected to the busbar.

[0036] Among them, convex weld strips are a special type of weld strip with a raised cross-section. Compared to traditional flat weld strips, convex weld strips, through their unique raised structure, can provide more specific contact methods and performance advantages during connection. The raised area refers to the upward-protruding part of the convex weld strip surface; this area is a key feature of the convex weld strip structure and plays an important role in connecting with other components.

[0037] Specifically, in the intricate construction of photovoltaic (PV) modules, solder ribbons play an indispensable role as a crucial link for current transmission. The solder ribbons mentioned here employ a special design called convex solder ribbons. These convex solder ribbons are not ordinary planar structures; their cross-sections have a unique convex shape. The convex area is the core feature of the convex solder ribbon, connecting to busbars that partially overlap with the cell string in the height direction. This allows for increased spacing between the cells while ensuring proper current collection by the busbars. During PV module assembly, the convex area of ​​the solder ribbon connects to the busbars. Firstly, the convex structure increases the contact area between the solder ribbon and the busbars. During current transmission, a larger contact area means lower contact resistance, reducing energy loss due to resistance heating and improving the PV module's power generation efficiency. Secondly, this special connection method also enhances the mechanical stability of the connection, making the connection between the solder ribbon and the busbars more secure. Under external forces such as vibration during transportation or pulling during installation, it effectively reduces the risk of loosening or detachment, ensuring the long-term stable operation of the PV module.

[0038] In this embodiment, a convex solder strip is used in the photovoltaic module. The convex solder strip has a unique raised shape in its cross-section, and the raised area is a key feature. During assembly, the raised area of ​​the convex solder strip is connected to the busbar. This connection method can increase the contact area, reduce the contact resistance to reduce power loss, enhance the mechanical stability of the connection, reduce the risk of loosening and falling off, and ensure the stable operation of the module.

[0039] In one embodiment, such as Figure 2 As shown, the raised area of ​​the convex weld strip includes mutually perpendicular straight line segments and arc transition segments connecting adjacent straight line segments.

[0040] The straight segments are the straight line segments within the raised area of ​​the convex weld strip. These perpendicular straight segments form the basic framework of the raised area. The arc transition segments are arc-shaped transition sections used to connect adjacent straight segments. Their function is to make the connection between the straight segments smoother, avoid sharp edges, and reduce stress concentration and other problems.

[0041] In one embodiment, the convex welding strip features a unique structural design where the raised area comprises mutually perpendicular straight segments. These segments form a stable and regular basic framework for the raised area, ensuring precise and stable connection with the busbar. Simultaneously, arc transition sections are provided between adjacent straight segments. This design not only effectively avoids stress concentration at the connection points of the straight segments, reducing the risk of weld strip breakage due to stress during use and significantly improving the reliability and durability of the welding strip, but also ensures smoother current transmission within the welding strip, reducing energy loss caused by structural abrupt changes. This, in turn, improves the electrical performance and energy conversion efficiency of the entire welding system, providing strong support for the efficient and stable operation of related equipment.

[0042] In one embodiment, such as Figure 3 As shown, the busbar 4 includes an edge busbar 41 and a middle busbar 42; the middle busbar 42 is disposed in the middle part of the photovoltaic module and partially overlaps with the adjacent cell string in the photovoltaic module in the height direction; the edge busbar 41 partially overlaps with the edge cell string of the photovoltaic module in the height direction; the width of the edge busbar 41 is smaller than the width of the middle busbar 42.

[0043] Among them, the edge busbar 41 is a busbar located at the edge of the photovoltaic module, mainly connecting with the cell strings at the edge of the photovoltaic module and collecting current. The middle busbar 42 is a busbar located in the middle of the photovoltaic module, and its function is to establish a connection with the adjacent cell strings in the middle area of ​​the photovoltaic module to achieve current collection. Height direction: In the three-dimensional structure of the photovoltaic module, the direction perpendicular to the module plane describes the overlap relationship between the busbar and the cell strings in the height direction, reflecting their spatial layout and connection method.

[0044] Specifically, the photovoltaic module includes two different types of busbars: edge busbars 41 and middle busbars 42. The middle busbar 42 is located in the middle of the photovoltaic module, partially overlapping with the adjacent cell strings in the height direction. This design allows the middle busbar 42 to achieve a tight and efficient connection with the cell strings, ensuring stable current conduction from the cell strings to the middle busbar 42. The edge busbar 41 partially overlaps with the edge cell strings of the photovoltaic module in the height direction, similarly ensuring that the current from the edge cell strings can be smoothly collected onto the edge busbar 41. Furthermore, the width of the edge busbar 41 is smaller than the width of the middle busbar 42. This is determined based on the current distribution characteristics of the cell strings in different areas of the photovoltaic module and overall layout optimization. The narrower edge busbar 41 meets the current collection requirements of the edge cell strings while saving material costs; while the wider middle busbar 42 can better handle the relatively large current collection task in the middle area, improving the stability and reliability of current transmission. This differentiated busbar width design and reasonable layout effectively improve the overall performance of photovoltaic modules, reduce losses during current transmission, and enhance the power generation efficiency and stability of the modules.

[0045] In one embodiment, adjacent battery strings include a first battery string and a second battery string; an intermediate busbar is symmetrically disposed between the first battery string and the second battery string.

[0046] In a photovoltaic (PV) module, adjacent cell strings are series or parallel combinations of multiple PV cells connected in a specific way, located close to and adjacent to each other. They work together to convert light energy into electrical energy. The first cell string is a specific cell string within the adjacent string group, named for ease of description and distinction. The second cell string is another cell string adjacent to the first, forming the adjacent cell string relationship. The intermediate busbar is a conductive component located in the middle area of ​​the PV module, used to collect current. It plays a crucial role in converging and conducting the current generated by adjacent cell strings.

[0047] Specifically, adjacent battery strings consist of two parts: a first battery string and a second battery string. To achieve efficient and balanced current collection, an intermediate busbar is symmetrically positioned between the first and second battery strings. This symmetrical layout ensures that the connection distance and angle between the intermediate busbar and the first and second battery strings remain consistent, guaranteeing that the current path length from the first and second battery strings to the intermediate busbar is equal and the resistance is balanced. In other words, the overlap area between the intermediate busbar and the first battery string is equal to the overlap area between the intermediate busbar and the second battery string. This results in more stable and smooth current transmission, avoiding problems such as uneven current distribution and localized overheating caused by path differences. Simultaneously, the symmetrical arrangement enhances the stability and reliability of the photovoltaic module structure, reducing the risk of mechanical stress and electrical faults that may arise from improper layout. This effectively improves the overall performance and lifespan of the photovoltaic module, providing a strong guarantee for the efficient and stable operation of the photovoltaic power generation system. It can be understood that a symmetrical arrangement means that the area difference between the overlap area of ​​the intermediate busbar with the first battery string and the overlap area with the second battery string is small, less than a preset threshold. For example, the intermediate busbar can also be asymmetrically arranged between the first battery string and the second battery string.

[0048] In one embodiment, the isolation strip includes a first isolation strip disposed between the intermediate busbar and the first battery string; one side of the first isolation strip is aligned with the edge of the intermediate busbar in the width direction, and the other side is aligned with the edge of the first battery string.

[0049] Among them, the isolation strip is a strip-shaped component in a photovoltaic module used to achieve electrical isolation and prevent short circuits or leakage between different components, ensuring the safe and stable operation of the internal circuitry of the photovoltaic module. The width direction is the dimension perpendicular to the length direction for components such as isolation strips, busbars, and cell strings.

[0050] Specifically, the isolation strip includes a first isolation strip disposed between the intermediate busbar and the first battery string. During installation, the first isolation strip is positioned in the width direction, with one side strictly aligned with the edge of the intermediate busbar and the other side precisely aligned with the edge of the first battery string. This precise alignment ensures that the first isolation strip can completely cover the area between the intermediate busbar and the first battery string where electrical contact may occur, effectively avoiding the risk of electrical short circuits caused by irregular component edges or installation deviations. Simultaneously, a reasonable isolation strip layout does not obstruct the normal transmission of current, maintaining good electrical performance of the photovoltaic module while ensuring electrical safety, improving the reliability and lifespan of the photovoltaic module, and reducing subsequent maintenance costs. For example, one side of the first isolation strip in the width direction may not be aligned with the edge of the intermediate busbar, and the other side may not be aligned with the edge of the first battery string; that is, the cross-sectional area of ​​the first isolation strip is slightly smaller than the overlapping area of ​​the intermediate busbar and the first battery string. After lamination, the first isolation strip can completely cover the overlapping area, thus saving costs.

[0051] In one embodiment, such as Figure 4 As shown, the edge busbar 41 includes a head busbar 411 disposed at the head of the photovoltaic module and a tail busbar 412 disposed at the tail of the photovoltaic module.

[0052] The head busbar 411 is an edge busbar located at the head of the photovoltaic module (generally referring to the starting position of the photovoltaic module during installation or layout), mainly responsible for collecting the current of the cell strings near that end. The tail busbar 412 is an edge busbar located at the tail of the photovoltaic module (opposite to the head, which is the end position of the photovoltaic module during installation or layout), used to collect the current of the cell strings near that end.

[0053] Specifically, to achieve efficient and orderly current collection from photovoltaic (PV) modules, an edge busbar layout design was implemented. The edge busbars include a head busbar 411 located at the head of the PV module and a tail busbar 412 located at the tail of the PV module. The head busbar 411 is precisely installed at the head of the PV module, enabling timely and effective collection of current generated by the nearby cell strings, preventing current accumulation that could lead to energy loss and potential safety hazards. The tail busbar 412 is strategically located at the tail of the PV module, similarly undertaking the important task of collecting current from the nearby cell strings. This layout, with edge busbars positioned at the head and tail, ensures that current from different areas of the PV module is collected and conducted efficiently, forming a complete and smooth current transmission loop. This not only improves current collection efficiency and reduces losses during current transmission but also enhances the stability and reliability of the overall electrical structure of the PV module, contributing to improved power generation performance and lifespan, and providing strong support for the efficient operation of the solar power system.

[0054] In one embodiment, the width of the intermediate busbar is greater than or equal to twice the distance between adjacent battery strings.

[0055] Specifically, to ensure efficient and stable current collection and transmission in photovoltaic modules, the width of the intermediate busbar was designed. Considering the layout of adjacent cell strings within the photovoltaic module and the characteristics of current transmission, the width of the intermediate busbar was set to be greater than or equal to twice the distance between adjacent cell strings. This design provides the intermediate busbar with sufficient width to establish good electrical connections with multiple adjacent cell strings simultaneously, fully covering the area between adjacent cell strings and effectively avoiding problems such as poor connection and current transmission obstruction caused by insufficient busbar width. Simultaneously, the wider intermediate busbar reduces resistance during current transmission, minimizes energy loss, and improves current collection efficiency. Furthermore, this design enhances the mechanical strength of the intermediate busbar, making it less prone to damage during photovoltaic module use, improving the overall reliability and stability of the photovoltaic module, helping to extend its lifespan and reduce maintenance costs.

[0056] In one embodiment, the width of the overlapping area between the edge busbar and the edge battery string is greater than or equal to the width of the edge busbar extending beyond the edge battery string.

[0057] The overlapping area is the part where the edge busbar and the edge battery string cover each other in space. The electrical connection quality of this area directly affects the efficiency and reliability of current transmission from the edge battery string to the edge busbar.

[0058] The over-width is the width of the portion of the edge busbar that extends beyond the edge of the edge battery string in a direction perpendicular to its contact surface with the edge battery string.

[0059] Specifically, to optimize the current collection performance of photovoltaic (PV) modules, the layout and dimensional relationship between the edge busbars and the edge cell strings were designed. Specifically, a specific overlap area is formed between the edge busbars and the edge cell strings, and the width of this overlap area is set to be greater than or equal to the width of the edge busbar extending beyond the edge cell string. This design offers several advantages. First, the larger overlap area ensures a sufficiently large contact area between the edge busbars and the edge cell strings, thereby reducing contact resistance and allowing current to be transferred more smoothly from the edge cell strings to the edge busbars, reducing energy loss at the line connection and improving current collection efficiency. Second, this dimensional relationship enhances the stability of the connection between the edge busbars and the edge cell strings. When PV modules are affected by external environmental factors (such as temperature changes and vibrations), it effectively avoids contact problems caused by loose connections, ensuring the long-term stable operation of the PV modules. Furthermore, the reasonable dimensional design also helps to improve the overall structural strength of the PV modules, reduces the risk of component damage due to localized stress concentration, extends the service life of the PV modules, and reduces maintenance costs.

[0060] In one embodiment, the portion of the edge busbar extending beyond the edge battery string is provided with a groove structure.

[0061] The groove structure is an inwardly recessed groove-like structure set in the part of the edge busbar that extends beyond the edge battery string. This structure can be formed through specific processing technology, and its shape, size and distribution can be designed according to actual needs.

[0062] Specifically, to further improve the performance and reliability of photovoltaic modules, the structure of the edge busbar was designed. Specifically, the portion of the edge busbar extending beyond the edge cell string features a grooved structure. This design has several important implications. From an electrical connection perspective, the grooved structure increases the friction and adhesion between the edge busbar and adjacent components (such as encapsulation materials, other conductive structures, etc.), making the edge busbar more stable within the photovoltaic module and reducing loosening and displacement caused by vibration, temperature changes, etc. This ensures the long-term stability of the electrical connection between the edge busbar and the edge cell string, reduces contact resistance, and improves current transmission efficiency. From a mechanical performance perspective, the grooved structure disperses the stress generated when the edge busbar is subjected to external forces, preventing stress concentration that could lead to cracks or breakage, thus enhancing the mechanical strength and durability of the edge busbar. Furthermore, this unique structural design optimizes the heat dissipation performance inside the photovoltaic module. The grooved structure increases the surface area of ​​the edge busbar, facilitating heat dissipation and preventing localized overheating from affecting the power generation efficiency and lifespan of the photovoltaic module. In summary, the groove structure of the edge busbar extending beyond the edge battery string effectively improves the overall performance and reliability of the photovoltaic module.

[0063] In one specific embodiment, a photovoltaic module is also provided, in which a busbar is partially placed on the back of the photovoltaic module, with the portion extending beyond the cell string used for welding to the solder strips on the cell string. A separator strip is used to block the circuit at the contact point between the cell and the busbar. The separator strip is transparent, made of PET (Polyethylene Terephthalate) as the substrate, and co-extruded with an EVA (Ethylene Vinyl Acetate Copolymer) layer, offering advantages such as aesthetic appearance and reduced bifaciality. The head and tail busbars of the photovoltaic module are 6mm wide (3mm on the back of the cell and 3mm extending beyond the cell edge); the middle busbar is 11mm wide, both placed on the back of the cell for welding to the solder strips on the cell string. The spacing between adjacent cell strings is 5mm.

[0064] For example, using the aforementioned photovoltaic module, the distance from the busbar to the short side of the glass can be increased from 12.7mm to 19.2mm, increasing the formwork space by 6.5mm (a total increase of 13mm from the beginning to the end), allowing for further increases in cell size; the cell size can be increased from 182*183.75 to 182*184.85, theoretically increasing the power of the same formwork module by ≥4W. Furthermore, if the cell size remains unchanged, the inter-cell spacing can be increased from 0.8mm to 1.5mm, reducing the main grid microcrack defect rate from 30% to 2%, significantly increasing process yield, and improving module quality and reliability; simultaneously, it can be paired with large-diameter round wire welding strips, increasing power by ≥2W; the reflected light from the inter-cell reflective film can be approximately doubled, increasing power by 2W, and the overall power can be increased by 4W.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A photovoltaic module, characterized by, This includes battery strings, solder strips, separators, and busbars arranged in sequence; The busbar and the battery string partially overlap in the height direction; the isolation strip is disposed in the overlapping area between the busbar and the battery string; The solder strip connects the battery string and the busbar; the solder strip extends beyond the reserved length of the battery string, but is less than or equal to the reserved width of the busbar extending beyond the battery string.

2. The photovoltaic module of claim 1, wherein, The welding strip is a convex welding strip, and the convex area of ​​the welding strip is connected to the busbar.

3. The photovoltaic module of claim 2, wherein, The raised area of ​​the convex weld strip includes mutually perpendicular straight line segments and arc transition segments connecting adjacent straight line segments.

4. The photovoltaic module of claim 1, wherein, The busbar includes an edge busbar and a middle busbar; the middle busbar is located in the middle part of the photovoltaic module and partially overlaps with the adjacent cell string in the photovoltaic module in the height direction; the edge busbar partially overlaps with the edge cell string of the photovoltaic module in the height direction. The width of the edge busbar is smaller than the width of the middle busbar.

5. The photovoltaic module according to claim 4, characterized in that, The adjacent battery strings include a first battery string and a second battery string; the intermediate busbar is symmetrically arranged between the first battery string and the second battery string.

6. The photovoltaic module of claim 5, wherein, The isolation strip includes a first isolation strip disposed between the intermediate busbar and the first battery string; one side of the first isolation strip is aligned with the edge of the intermediate busbar in the width direction, and the other side is aligned with the edge of the first battery string.

7. The photovoltaic module of claim 4, wherein, The edge busbars include a head busbar disposed at the head of the photovoltaic module and a tail busbar disposed at the tail of the photovoltaic module.

8. The photovoltaic module of claim 4, wherein, The width of the intermediate busbar is greater than or equal to twice the distance between the adjacent battery strings.

9. The photovoltaic module of claim 4, wherein, The width of the overlapping area between the edge busbar and the edge battery string is greater than or equal to the width of the edge busbar extending beyond the edge battery string.

10. The photovoltaic module of claim 4, wherein, The portion of the edge busbar that extends beyond the edge battery string is provided with a groove structure.

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