Photovoltaic module

Abstract

The embodiment of the invention relates to the photovoltaic field, and provides a photovoltaic module, the photovoltaic module comprises a plurality of battery strings, a first connecting structure, a second connecting structure, an adhesive film and a cover plate, each battery string comprises a plurality of battery pieces, the plurality of battery pieces comprise first battery pieces with chamfers and second battery pieces without chamfers, and the first connecting structure and the second connecting structure are arranged on the cover plate. The first battery piece and the second battery piece are N pieces formed by cutting a whole solar battery piece, N is greater than or equal to 3, and the battery string comprises a head end and a tail end which are oppositely arranged; the two opposite sides of the first connecting structure are electrically connected with the same number of battery strings, the first connecting structure is electrically connected with the battery pieces at the head ends of the battery strings, and the battery pieces at the tail ends of the multiple battery strings located on the same side of the first connecting structure are first battery pieces or second battery pieces; the adhesive film is positioned on the surface of the battery string; the cover plate is located on the surface of the adhesive film deviating from the cell string. According to the embodiment of the invention, the performance of the photovoltaic module can be improved, and the aesthetic property of the photovoltaic module is improved.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the photovoltaic field, and in particular to a photovoltaic module. Background Art

[0002] With global energy consumption rapidly increasing and traditional fossil fuels becoming increasingly depleted, energy and environmental issues are becoming two major global concerns. Pressured by environmental pollution and the need for sustainable development, researchers have prioritized the solar photovoltaic industry as a key area of renewable energy development and utilization.

[0003] Photovoltaic modules are important devices that convert solar energy into electrical energy. However, current photovoltaic modules suffer from high power loss, resulting in poor performance. Summary of the invention

[0004] The embodiments of the present disclosure provide a photovoltaic module, which is at least beneficial to improving the performance of the photovoltaic module and enhancing the aesthetics of the photovoltaic module.

[0005] According to some embodiments of the present disclosure, the embodiments of the present disclosure provide a photovoltaic module, comprising: a plurality of battery strings, the battery strings comprising a plurality of battery cells, the plurality of battery cells comprising a first battery cell with a chamfer and a second battery cell without a chamfer, the first battery cell and the second battery cell being N slices cut from a whole solar cell, N being greater than or equal to 3, the battery string comprising a head end and a tail end arranged opposite to each other; a first connecting structure, opposite sides of the first connecting structure electrically connecting the same number of battery strings, the first connecting structure electrically connecting the battery cells at the head end of the battery string, the battery cells at the tail end of the plurality of battery strings located on the same side of the first connecting structure are all the first battery cells, or are all the second battery cells; a second connecting structure, the second connecting structure being located on opposite sides of the first connecting structure and electrically connected to the battery cells at the tail end of the battery string; an adhesive film, the adhesive film being located on a surface of the battery string; a cover plate, the cover plate being located on a surface of the adhesive film facing away from the battery string.

[0006] In some embodiments, the battery cells at the tail ends of the battery strings on one side of the first connection structure are the first battery cells, and the battery cells at the tail ends of the battery strings on the other side of the first connection structure are the second battery cells.

[0007] In some embodiments, the first battery cell includes a cutting surface and a non-cutting surface that are oppositely arranged, and the chamfers of the first battery cell are arranged on both sides of the non-cutting surface; the non-cutting surfaces of the first battery cells located on the same battery string are oriented in the same direction.

[0008] In some embodiments, the first connection structure includes a plurality of first busbars spaced apart along a first direction, and the first busbars extend along the first direction; the non-cutting surfaces of the first solar cells on one side of the first busbars face in the opposite direction to the non-cutting surfaces of the first solar cells on the other side of the first busbars.

[0009] In some embodiments, at least two of the battery strings are connected to one side of the first busbar. The adjacent battery strings on one side of the first busbar include the same number of the first solar cells and the same number of the second solar cells, and the adjacent first solar cells in the adjacent battery strings are arranged along the first direction, and the adjacent second solar cells are arranged along the first direction.

[0010] In some embodiments, two of the battery strings are electrically connected to each of the opposite sides of the first busbar; the second connection structure includes: a second busbar and a third busbar spaced apart along the first direction. The second busbar extends along the first direction and is electrically connected to the solar cells at the tails of 4 of the battery strings, and the third busbar extends along the first direction and is electrically connected to the solar cells at the tails of 2 of the battery strings.

[0011] In some embodiments, the photovoltaic module further includes: a first jumper wire that extends along a second direction and is electrically connected to the second busbars on both sides of the first busbar; a second jumper wire that extends along the second direction and is electrically connected to the third busbars on both sides of the first busbar.

[0012] In some embodiments, the photovoltaic module includes a first edge and a second edge that are opposite to each other. The plurality of first busbars include a first edge busbar, a second edge busbar, and an intermediate busbar. The first edge busbar is adjacent to the first edge, the second edge busbar is adjacent to the second edge, and the intermediate busbar is located between the first edge busbar and the second busbar; the first edge busbar and the second busbar are electrically connected to two of the battery strings, and in the two battery strings that are electrically connected, the non-cutting surfaces of the first solar cells face in the same direction; the intermediate busbar and the second busbar are electrically connected to two of the battery strings, and in the two battery strings that are electrically connected, the non-cutting surfaces of the first solar cells face in the same direction; the second edge busbar and the third busbar are electrically connected to two of the battery strings, and in the two battery strings that are electrically connected, the non-cutting surfaces of the first solar cells face in the same direction.

[0013] In some embodiments, adjacent solar cells in the battery string are arranged with partial overlap, and the length of the region of partial overlap between adjacent solar cells in the second direction is a first length, and the first length is 0 to 0.4 mm.

[0014] In some embodiments, the photovoltaic module includes the first solar cell and the second solar cell cut from 51 whole solar cells.

[0015] The technical solutions provided by the embodiments of the present disclosure have at least the following advantages:

[0016] In the photovoltaic module provided by the embodiments of the present disclosure, the solar cell is an N-piece cut from a whole solar cell. Among them, the larger N is, the smaller the area of the solar cell is. And N in the embodiments of the present disclosure is greater than or equal to 3, that is, the value of N is relatively large, so that the area of the solar cell is small, and the current transmission path on the solar cell can be short, so that the current loss on the solar cell can be small, which is beneficial to improving the performance of the photovoltaic module. In addition, multiple solar cells include a first solar cell with a chamfer and a second solar cell without a chamfer. The solar cells at the ends of multiple battery strings on the same side of the first connection structure are all first solar cells or all second solar cells, so that the arrangement of the solar cells at the ends of multiple battery strings on the same side of the first connection structure is regular, which can improve the aesthetics of the photovoltaic module. Description of the Drawings

[0017] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments. Unless otherwise stated, the figures in the drawings do not constitute a proportional limitation; in order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following described drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0018] Figure 1 It is a schematic structural diagram of a photovoltaic module provided by an embodiment of the present disclosure;

[0019] Figure 2 It is a schematic structural diagram of a battery string provided by an embodiment of the present disclosure;

[0020] Figure 3 It is a schematic structural diagram of a whole solar cell provided by an embodiment of the present disclosure;

[0021] Figure 4 For Figure 3 It is a schematic structural diagram of the solar cell after being cut along the dotted line in

[0022] Figure 5 A schematic cross-sectional structure diagram of a photovoltaic module provided by an embodiment of the present disclosure;

[0023] Figure 6 A schematic structure diagram of adjacent solar cells and solder tapes in a photovoltaic module provided by an embodiment of the present disclosure;

[0024] Figure 7 is Figure 1 A partial enlarged schematic diagram of the first connection structure in

[0025] Figure 8 A schematic cross-sectional structure diagram of a first jumper, an isolation film, and a solar cell in a photovoltaic module provided by an embodiment of the present disclosure;

[0026] Figure 9 A schematic circuit diagram of a photovoltaic module provided by an embodiment of the present disclosure;

[0027] Figure 10 Another schematic circuit diagram of a photovoltaic module provided by an embodiment of the present disclosure. Detailed implementation manners

[0028] In the photovoltaic modules in the related art, the solar cells are usually 2-fragments of a whole solar cell. The area of the solar cells is relatively large, so that the current transmission path on the solar cells is long, resulting in large current loss on the solar cells and poor performance of the photovoltaic modules.

[0029] Therefore, the performance of the photovoltaic modules in the related art needs to be improved.

[0030] In the photovoltaic module provided by the embodiment of the present disclosure, the solar cells are N-fragments cut from a whole solar cell. N is greater than or equal to 3, that is, the value of N is relatively large, so that the area of the solar cells is small, and the current transmission path on the solar cells can be short, so that the current loss on the solar cells can be small, which is beneficial to improving the performance of the photovoltaic module. In addition, multiple solar cells include a first solar cell with a chamfer and a second solar cell without a chamfer. The solar cells at the ends of multiple battery strings on the same side of the first connection structure are all first solar cells or all second solar cells, so that the arrangement of the solar cells at the ends of multiple battery strings on the same side of the first connection structure is regular, which can improve the aesthetics of the photovoltaic module.

[0031] In the description of the embodiments of the present disclosure, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present disclosure, "multiple" means more than two, unless otherwise specifically defined.

[0032] Reference to "embodiments" in this document means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present disclosure. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment each time, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0033] In the description of the embodiments of the present disclosure, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: the existence of A, the simultaneous existence of A and B, and the existence of B. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0034] In the description of the embodiments of the present disclosure, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0035] In the description of the embodiments of the present disclosure, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present disclosure.

[0036] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0037] In the accompanying drawings corresponding to the embodiments of the present disclosure, for better understanding and convenience of description, the thickness and area of the layers are enlarged. When describing a component (such as a layer, film, region, or substrate) being on or on the surface of another component, the component can be "directly" on the surface of the other component, or there can be a third component between the two components. Conversely, when describing a component being on the surface of another component or when the surface of one component forms or is provided with another component, it means there is no third component between the two components. In addition, when describing a component being "substantially" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor on a partial edge of the entire surface.

[0038] In the description of the embodiments of the present disclosure, when a certain component "includes" another component, unless otherwise specified, other components are not excluded, and other components may further be included. In addition, when components such as layers, films, regions, or plates are referred to as being "on / at" another component, it can be "directly on" the other component (i.e., on the surface of the other component with no other components therebetween), or there can be another component therebetween. In addition, when components such as layers, films, regions, plates, etc. are "directly located on" another component, or when components such as layers, films, regions, plates, etc. are located on the surface of another component, it means there are no other components located therebetween.

[0039] The following will elaborate on each embodiment of the present disclosure in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present disclosure, many technical details are provided to enable readers to better understand the present disclosure. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present disclosure can still be implemented.

[0040] Figure 1 A schematic structural diagram of a photovoltaic module provided for an embodiment of the present disclosure; Figure 2 A schematic structural diagram of a battery string provided for an embodiment of the present disclosure; Figure 3 A schematic structural diagram of a whole solar cell provided for an embodiment of the present disclosure; Figure 4 Along Figure 3 The schematic structural diagram of the cell piece after being cut along the dashed line in Figure 5 A schematic cross-sectional structural diagram of a photovoltaic module provided for an embodiment of the present disclosure.

[0041] With reference to Figures 1 to 5, the photovoltaic module includes: a plurality of cell strings 1, a first connection structure 2, a second connection structure 3, a glue film 4, and a cover plate 5. The cell string 1 includes a plurality of cells 10, and the plurality of cells 10 includes a first cell 12 with a chamfer 11 and a second cell 13 without a chamfer 11. The first cell 12 and the second cell 13 are N pieces obtained by cutting a whole solar cell 14, where N is greater than or equal to 3. The cell string 1 includes a head end and a tail end arranged oppositely; the opposite sides of the first connection structure 2 are electrically connected to the same number of cell strings 1. The first connection structure 2 is electrically connected to the cells 10 at the head end of the cell string 1. The cells 10 at the tail ends of the plurality of cell strings 1 on the same side of the first connection structure 2 are all the first cells 12 or all the second cells 13; the second connection structure 3 is located on the opposite sides of the first connection structure 2 and is electrically connected to the cells 10 at the tail end of the cell string 1; the glue film 4 is located on the surface of the cell string 1; the cover plate 5 is located on the surface of the glue film 4 facing away from the cell string 1.

[0042] The cells 10 in the cell string 1 can be one or any combination of PERC cells (Passivated Emitter Rear Cell), IBC cells (Interdigitated Back Contact), TOPCon cells (Tunnel Oxide Passivated Contact), HIT / HJT cells (Heterojunction Technology), solar thin film cells, and tandem cells. Among them, the solar thin film cells include, but are not limited to, perovskite solar thin film cells, copper indium selenide solar thin film cells, gallium arsenide solar thin film cells, and cadmium sulfide solar thin film cells. The tandem cells are perovskite cells stacked with crystalline silicon cells, perovskite cells stacked with perovskite cells, and perovskite cells stacked with thin film cells. Figures 1 to 5 Taking the cell 10 as a TOPCon cell as an example.

[0043] In some embodiments, the cells 10 can be cells with main grids or cells without main grids.

[0044] In some cases, when the solar cell 10 is a main-grid solar cell, the surface of the solar cell 10 has a plurality of main grids arranged at intervals and a plurality of sub-grids arranged at intervals. The main grid includes a main-grid connection line and pads located on the main-grid connection line. In the process of constructing the battery string 1 using the solar cell 10, the solder tape 6 is electrically connected to at least one main grid on each of two adjacent solar cells 10. The solder tape 6 can be electrically connected to the main grid by means of a welding process to be electrically connected to the pad, or the solder tape 6 can be pre-fixed above the main grid using glue dots, and the electrical connection between the solder tape 6 and the main grid is achieved by the fusion of the glue dots and the deformation of the solder tape 6 during the lamination process.

[0045] In other cases, when the solar cell 10 is a main-gridless solar cell, the surface of the solar cell 10 has a plurality of sub-grids arranged at intervals. In the process of constructing the battery string 1 using the solar cell 10, the solder tape 6 is electrically connected to a plurality of sub-grids on each of two adjacent solar cells 10. The solder tape 6 can be fixed at a specific position above the solar cell 10 using glue dots, and then the electrical connection between the solder tape 6 and the sub-grid is achieved by the fusion of the glue dots and the deformation of the solder tape 6 during the lamination and forming process.

[0046] In some embodiments, the photovoltaic module includes a first solar cell 12 and a second solar cell 13 cut from 51 whole solar cells 14. Compared with the solution of using solar cells cut from 72 or 66 whole solar cells in the related art, the photovoltaic module using solar cells 10 cut from 51 whole solar cells 14 can reduce the size of the photovoltaic module, enabling the photovoltaic module to be adapted to more application scenarios, thereby facilitating the improvement of the practicality of the photovoltaic module.

[0047] In some embodiments, the width of the photovoltaic module in the first direction X can be 1130 mm to 1140 mm, such as 1130 mm, 1132 mm, 1134 mm, 1136 mm, 1138 mm or 1140 mm; the length of the photovoltaic module in the second direction Y can be 1854 mm to 1906 mm, such as 1854 mm, 1860 mm, 1870 mm, 1880 mm, 1890 mm, 1900 mm or 1906 mm.

[0048] Figure 6 This is a schematic structural diagram of adjacent solar cells and solder tapes in the photovoltaic module provided by the embodiments of the present disclosure.

[0049] Reference Figure 2 and Figure 6, in some embodiments, adjacent solar cells 10 in the battery string 1 are arranged with partial overlap, and the length of the region where adjacent solar cells 10 partially overlap along the second direction Y is a first length, and the first length is 0 to 0.4 mm, such as 0.1 mm, 0.2 mm, 0.3 mm or 0.4 mm. The adjacent solar cells 10 in the battery string 1 are arranged with partial overlap, which can reduce the length of the battery string 1, is beneficial to reducing the size of the photovoltaic module, enabling the photovoltaic module to be adapted to more application scenarios, and thus is beneficial to improving the practicality of the photovoltaic module. When the first length is within the above range, while reducing the size of the photovoltaic module, it can avoid the overlapped region being too large and affecting the absorption of sunlight by the solar cells 10.

[0050] In some embodiments, a buffer member (not shown) may be provided between the solder tape 6 and the solar cell 10, and the buffer member is arranged in the overlapping region. The buffer member can provide a buffering force for the locally rearranged solar cells 10, reducing the rigid contact between the solar cells 10 and the solder tape 6, thereby avoiding the problem of the solar cells 10 being cracked due to the solder tape 6 directly squeezing the solar cells 10 during the lamination process.

[0051] The material of the buffer member may be EVA (ethylene-vinyl acetate copolymer) or rubber, etc.

[0052] Reference Figure 2 , Figure 4 and Figure 6 , in some embodiments, the size of the chamfer 11 of the first solar cell 12 is less than or equal to the first length. Thus, when the second solar cell 13 is placed on the first solar cell 12 with the chamfer 11, the size of the chamfer 11 of the first solar cell 12 being less than or equal to the first length can avoid the chamfer 11 being exposed, making the appearance of the first solar cell 12 after being partially shaded similar to that of the second solar cell 13 after being partially shaded, and the appearance of the solar cells 10 in the battery string 1 can be similar, which is beneficial to improving the aesthetics of the photovoltaic module.

[0053] In some embodiments, the adjacent solar cells 10 in the battery string 1 may also be arranged at intervals, and the distance between adjacent solar cells 10 along the second direction Y may be 0 to 1.5 mm, such as 0.1 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm or 1.5 mm.

[0054] Reference Figures 2 to 4 , the solar cells 10 in the battery string 1 are N sub-pieces cut from a whole solar cell 14, and N is greater than or equal to 3. For example, N may be 3, 4, 5, etc. Chamfers 11 are provided at the respective boundaries of the solar cell 14 to reduce the stress outside the battery and avoid damage to the corners of the battery. After cutting the whole solar cell 14, a first solar cell 12 with a chamfer 11 and a second solar cell 13 without a chamfer 11 will be formed.

[0055] In some embodiments, the width of the solar cell 14 in the first direction X is 180 mm to 190 mm, such as 180 mm, 182 mm, 184 mm, 186 mm or 188 mm; the length of the solar cell 14 in the second direction Y is 210 mm to 220 mm, such as 210 mm, 212 mm, 214 mm, 216 mm or 218 mm.

[0056] In some embodiments, the first cell 12 includes a cutting surface 121 and a non-cutting surface 122 which are oppositely arranged, and the chamfers 11 of the first cell 12 are arranged on both sides of the non-cutting surface 122; the non-cutting surfaces 122 of the first cells 12 on the same battery string 1 face the same direction. Along Figure 3 After cutting along the dotted line, the second cell 13 will have two oppositely arranged cutting surfaces 121, while the first cell 12 will only have one non-cutting surface 122, and the chamfers 11 are located on both sides opposite to the non-cutting surface 122, that is, the orientation of the non-cutting surface 122 affects the position where the chamfers 11 are located. The non-cutting surfaces 122 of the first cells 12 on the same battery string 1 face the same direction, so that the chamfers 11 of the first cells 12 on a single battery string 1 are arranged regularly, which is beneficial to improving the aesthetics of the photovoltaic module.

[0057] The orientation of the non-cutting surface 122 of the first cell 12 refers to the direction in which the non-cutting surface 122 in the first cell 12 points to the non-cutting surface 122.

[0058] In some embodiments, the cell 10 at the tail end of multiple battery strings 1 on one side of the first connection structure 2 is the first cell 12, and the cell 10 at the tail end of multiple battery strings 1 on the other side of the first connection structure 2 is the second cell 13. With such an arrangement, users can distinguish the two sides of the first connection structure 2 by whether the cell 10 at the tail end of the battery string 1 is the first cell 12 or the second cell 13.

[0059] The first connection structure 2 is used to electrically connect the cells 10 at the head end of the battery string 1, and the second connection structure 3 is used to electrically connect the cells 10 at the tail end of the battery string 1.

[0060] Figure 7 For Figure 1 Partial enlarged view of the first connection structure.

[0061] With reference to Figure 1 、 Figure 4 and Figure 7, in some embodiments, the first connection structure 2 includes a plurality of first busbars 20 spaced apart along the first direction X, and the first busbars 20 extend along the first direction X; the orientations of the non-cut surfaces 122 of the first solar cells 12 on one side of the first busbars 20 are opposite to the orientations of the non-cut surfaces 122 of the first solar cells 12 on the other side of the first busbars 20. Among them, the chamfers 11 are located on both sides opposite to the non-cut surfaces 122, and the opposite orientations of the non-cut surfaces 122 of the first solar cells 12 on one side of the first busbars 20 and the non-cut surfaces 122 of the first solar cells 12 on the other side of the first busbars 20 make the arrangement rules of the chamfers 11 of the first solar cells 12 in the battery strings 1 on both sides of the first busbars 20, which is beneficial to improving the aesthetics of the photovoltaic module.

[0062] In some embodiments, at least two battery strings 1 are connected to one side of the first busbar 20. The adjacent battery strings 1 on one side of the first busbar 20 include the same number of first solar cells 12 and the same number of second solar cells 13, and the adjacent first solar cells 12 in the adjacent battery strings 1 are arranged along the first direction X, and the adjacent second solar cells 13 are arranged along the first direction X. The adjacent first solar cells 12 in the adjacent battery strings 1 are arranged along the first direction X, that is, the distances between the adjacent first solar cells 12 in the adjacent battery strings 1 and the solar cell 10 at the head end can be the same, that is to say, the positions of the adjacent first solar cells 12 in the respective battery strings 1 can be the same. Similarly, the adjacent second solar cells 13 in the adjacent battery strings 1 are arranged along the first direction X, and the positions of the adjacent second solar cells 13 in the respective battery strings 1 are the same. With such an arrangement, the first solar cells 12 in the adjacent battery strings 1 on one side of the first busbar 20 are arranged regularly, and the second solar cells 13 are arranged regularly, which is beneficial to improving the aesthetics of the photovoltaic module.

[0063] Reference Figure 1 and Figure 7 , in some embodiments, two battery strings 1 are electrically connected to the opposite sides of the first busbar 20 respectively; the second connection structure 3 includes: a second busbar 31 and a third busbar 32 arranged at intervals along the first direction X. The second busbar 31 extends along the first direction X and is electrically connected to the solar cells 10 at the tails of 4 battery strings 1, and the third busbar 32 extends along the first direction X and is electrically connected to the solar cells 10 at the tails of 2 battery strings 1.

[0064] Figure 8 is a schematic cross-sectional structure diagram of a first jumper, an isolation film and a solar cell in the photovoltaic module provided by the embodiment of the present disclosure; Figure 9 is a schematic circuit diagram of the photovoltaic module provided by the embodiment of the present disclosure.

[0065] Combined with reference to Figure 1 , Figure 4 and Figures 7 to 9, in some embodiments, the photovoltaic module includes opposite first and second edges 15 and 16. The plurality of first busbars 20 includes a first edge busbar 21, a second edge busbar 22, and an intermediate busbar 23. The first edge busbar 21 is adjacent to the first edge 15, the second edge busbar 22 is adjacent to the second edge 16, and the intermediate busbar 23 is located between the first edge busbar 21 and the second busbar 31. The first edge busbar 21 and a second busbar 31 electrically connect two cell strings 1, and in the two electrically connected cell strings, the non-cutting surfaces 122 of the first cells 12 face the same direction; the intermediate busbar 23 and a second busbar 31 electrically connect two cell strings 1, and in the two electrically connected cell strings 1, the non-cutting surfaces 122 of the first cells 12 face the same direction; the second edge busbar 22 and a third busbar 32 electrically connect two cell strings 1, and in the two electrically connected cell strings 1, the non-cutting surfaces 122 of the first cells 12 face the same direction.

[0066] The first edge busbar 21 and the second busbar 31 are connected in parallel to two cell strings 1, and in the two cell strings 1 connected in parallel, the non-cutting surfaces 122 of the first cells 12 face the same direction. The chamfers 11 are located on both sides of the non-cutting surface 122, so that the chamfers 11 of the first cells 12 in the two cell strings 1 connected in parallel by the first edge busbar 21 and the second busbar 31 are arranged regularly, which is beneficial to improving the aesthetics of the photovoltaic module.

[0067] The intermediate busbar 23 and the second busbar 31 are connected in parallel to two cell strings 1, and in the two cell strings 1 connected in parallel, the non-cutting surfaces 122 of the first cells 12 face the same direction. The chamfers 11 are located on both sides of the non-cutting surface 122, so that the chamfers 11 of the first cells 12 in the two cell strings 1 connected in parallel by the intermediate busbar 23 and the second busbar 31 are arranged regularly, which is beneficial to improving the aesthetics of the photovoltaic module.

[0068] The second edge busbar 22 and the third busbar 32 are connected in parallel to two cell strings 1, and in the two cell strings 1 connected in parallel, the non-cutting surfaces 122 of the first cells 12 face the same direction, and the chamfers 11 are located on both sides of the non-cutting surface 122, so that the chamfers 11 of the first cells 12 in the two cell strings 1 connected in parallel by the second edge busbar 22 and the third busbar 32 are arranged regularly, which is beneficial to improving the aesthetics of the photovoltaic module.

[0069] Combined with reference Figure 1 、 Figure 5 、 Figure 8 and Figure 9, in some embodiments, the photovoltaic module further includes a first jumper 71 and a second jumper 72. The first jumper 71 extends along the second direction Y, and the first jumper 71 is electrically connected to the second busbars 31 located on both sides of the first busbar 20; the second jumper 72 extends along the second direction Y, and the second jumper 72 is electrically connected to the third busbars 32 located on both sides of the first busbar 20 and is electrically connected to the middle busbar 23.

[0070] Figure 10 Another circuit schematic diagram of the photovoltaic module provided by the embodiments of the present disclosure.

[0071] With reference to Figure 1 , Figure 5 , Figure 8 and Figure 10 , in some embodiments, the photovoltaic module may further include a first bypass diode (not labeled), a second bypass diode (not labeled), and a third bypass diode (not labeled). The two ends of the first bypass diode are respectively connected to the first edge busbar 21 and the first jumper 71. The first bypass diode can be reversely connected in parallel to the battery string 1 electrically connected to the first edge busbar 21, so that when the battery string 1 electrically connected to the first edge busbar 21 is shaded or fails, the first bypass diode can conduct, allowing the current to bypass the shaded or faulty current string 1, flow through the first bypass diode and the first jumper 71, and not affect the power generation of other normal battery strings 1 of the photovoltaic module.

[0072] The two ends of the second bypass diode are respectively connected to the middle busbar 23 and the first jumper 71. The second bypass diode can be reversely connected in parallel to the battery string 1 electrically connected to the middle busbar 23, so that when the battery string 1 electrically connected to the middle busbar 23 is shaded or fails, the second bypass diode can conduct, allowing the current to bypass the shaded or faulty current string 1, flow through the second bypass diode and the first jumper 71, and not affect the power generation of other normal battery strings 1 of the photovoltaic module.

[0073] The two ends of the third bypass diode are respectively connected to the second edge busbar 22 and the second jumper 72. The third bypass diode can be reversely connected in parallel to the battery string 1 electrically connected to the second edge busbar 22, so that when the battery string 1 electrically connected to the second edge busbar 22 is shaded or fails, the third bypass diode can conduct, allowing the current to bypass the shaded or faulty current string 1, flow through the third bypass diode and the second jumper 72, and not affect the power generation of other normal battery strings 1 of the photovoltaic module.

[0074] In some embodiments, the photovoltaic module further includes an isolation film 8, which is located between the first jumper 71 and the battery string 1, and also between the second jumper 72 and the battery string 1. The width of the isolation film 8 along the first direction X is greater than the width of the jumper 7 along the first direction X. The isolation film 8 can prevent the first jumper 71 from directly contacting the cell 10 in the battery string 1 and causing a short circuit, and can also prevent the second jumper 72 from directly contacting the cell 10 in the battery string 1 and causing a short circuit.

[0075] In some embodiments, the encapsulant film 4 can be a white film layer. In this way, it can have the same color as the encapsulant film 4, which can improve the aesthetics of the photovoltaic module. In a specific example, the encapsulant film 4 can be a white EVA layer, and the isolation film 8 can be a PET (polyethylene terephthalate) layer.

[0076] The isolation film 8 can also be other polymer materials other than PET, such as a PVB (polyvinyl butyral) layer.

[0077] Continuing to refer to Figure 1 and Figure 5 , in some embodiments, the encapsulant film 4 includes a first encapsulation layer and a second encapsulation layer. The first encapsulation layer covers one of the front or back surfaces of the cell 10, and the second encapsulation layer covers the other of the front or back surfaces of the cell Specifically, at least one of the first encapsulation layer or the second encapsulation layer can be an organic encapsulant film such as a polyvinyl butyral encapsulant film, an ethylene-vinyl acetate copolymer (EVA) encapsulant film, a polyethylene octene copolymer elastomer (POE) encapsulant film, or a polyethylene terephthalate (PET) encapsulant film. Alternatively, at least one of the first encapsulation layer or the second encapsulation layer can also be an encapsulant film such as an EP encapsulant film, an EPE encapsulant film, or a PVP encapsulant film. Among them, the EP encapsulant film refers to a co-extruded encapsulant film composed of an EVA encapsulant film and a POE encapsulant film stacked, the EPE encapsulant film refers to a co-extruded encapsulant film formed by sequentially stacking an EVA encapsulant film + a POE encapsulant film + an EVA encapsulant film, and the PVP encapsulant film refers to a co-extruded encapsulant film formed by stacking a POE encapsulant film + an EVA encapsulant film + a POE encapsulant film. The co-extruded encapsulant film can be prepared by extruding one or more raw materials onto another already formed encapsulant film in sequence during the encapsulant film processing, or by bonding different types of already formed encapsulant films together.

[0078] In some cases, there is a demarcation line between the first encapsulation layer and the second encapsulation layer before lamination. After the lamination process, there will no longer be the concept of the first encapsulation layer and the second encapsulation layer in the formed photovoltaic module, that is, the first encapsulation layer and the second encapsulation layer have formed the integral encapsulant film 4.

[0079] In some embodiments, the cover plate 5 may be a cover plate with a light-transmitting function such as a glass cover plate or a plastic cover plate. Specifically, the surface of the cover plate 5 facing the adhesive film 4 may be an uneven surface, thereby increasing the utilization rate of incident light. The cover plate 5 includes a first cover plate and a second cover plate. The first cover plate faces the first encapsulation layer, and the second cover plate faces the second encapsulation layer.

[0080] In some embodiments, the photovoltaic module is a double-glass module. The adhesive film 4 includes a front adhesive film and a back adhesive film. The cover plate 5 includes a front cover plate and a back cover plate. The front adhesive film and the front cover plate are located on the front side of the battery cell 10, and the back adhesive film and the back cover plate are located on the back side of the battery cell 10. The front cover plate is a glass cover plate, the front adhesive film is a high-transmittance adhesive film, the back adhesive film is a white EVA adhesive film, and the back cover plate is also a glass cover plate. The high-transmittance adhesive film can ensure that more sunlight passes through and enters the interior of the module, enabling the battery cell 10 to fully absorb light in the short wavelength band and increasing the short-circuit current. The white EVA adhesive film on the back can, through reflection, extend the path of light inside the module, enabling the battery cell to more fully absorb and utilize light incident from various angles, thereby improving the overall light utilization efficiency of the module.

[0081] In some embodiments, the photovoltaic module is a single-glass module. The adhesive film 4 includes a front adhesive film and a back adhesive film. The cover plate 5 includes a front cover plate and a back cover plate. The front adhesive film and the front cover plate are located on the front side of the battery cell 10, and the back adhesive film and the back cover plate are located on the back side of the battery cell 10. The front cover plate is a glass cover plate, the front adhesive film is a high-transmittance adhesive film, the back adhesive film is a white EVA adhesive film, and the back cover plate is also a white back plate.

[0082] Those of ordinary skill in the art can understand that the above-described embodiments are specific embodiments for implementing the present disclosure. In practical applications, various changes can be made to them in terms of form and details without departing from the spirit and scope of the present disclosure. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present disclosure. Therefore, the protection scope of the present disclosure should be determined by the scope defined by the claims.

Claims

1. A photovoltaic module, characterized in that, Comprising: Multiple battery strings, each battery string including multiple battery cells, the multiple battery cells including chamfered first battery cells and non-chamfered second battery cells, the first battery cells and the second battery cells being N sub-pieces cut from a whole solar cell, N being greater than or equal to 3, and the battery string including a head end and a tail end disposed opposite to each other; A first connection structure, opposite sides of the first connection structure being electrically connected to the same number of the battery strings, the first connection structure being electrically connected to the battery cells at the head end of the battery string, and the battery cells at the tail end of the multiple battery strings on the same side of the first connection structure all being the first battery cells or all being the second battery cells; A second connection structure, the second connection structure being located on opposite sides of the first connection structure and being electrically connected to the battery cells at the tail end of the battery string; A glue film, the glue film being located on the surface of the battery string; A cover plate, the cover plate being located on the surface of the glue film facing away from the battery string.

2. The photovoltaic module according to claim 1, characterized in that The battery cells at the tail end of the multiple battery strings on one side of the first connection structure are the first battery cells, and the battery cells at the tail end of the multiple battery strings on the other side of the first connection structure are the second battery cells.

3. The photovoltaic module according to claim 1, wherein, The first battery cell includes a cut surface and a non-cut surface disposed opposite to each other, and the chamfers of the first battery cell are disposed on both sides of the non-cut surface; The non-cut surfaces of the first battery cells on the same battery string face the same direction.

4. The photovoltaic module according to claim 3, wherein The first connection structure includes multiple first busbars spaced apart along a first direction, the first busbars extending along the first direction; The non-cut surface of the first battery cell on one side of the first busbar faces in a direction opposite to the non-cut surface of the first battery cell on the other side of the first busbar.

5. The photovoltaic module according to claim 4, characterized in that, At least 2 battery strings are connected to one side of the first busbar, and the adjacent battery strings on one side of the first busbar include the same number of the first battery cells and the same number of the second battery cells, and the adjacent first battery cells in the adjacent battery strings are arranged along the first direction, and the adjacent second battery cells are arranged along the first direction.

6. The photovoltaic module according to claim 5, characterized in that, Two battery strings are electrically connected to opposite sides of the first busbar respectively; The second connection structure includes: a second busbar and a third busbar arranged at intervals along the first direction, the second busbar extending along the first direction and being electrically connected to the battery cells at the tail end of 4 battery strings, and the third busbar extending along the first direction and being electrically connected to the battery cells at the tail end of 2 battery strings.

7. The photovoltaic module according to claim 6, wherein, The photovoltaic module includes a first edge and a second edge opposite to each other, the multiple first busbars including a first edge busbar, a second edge busbar, and a middle busbar, the first edge busbar being adjacent to the first edge, the second edge busbar being adjacent to the second edge, and the middle busbar being located between the first edge busbar and the second busbar; The first edge busbar is electrically connected to one of the second busbars to connect two of the battery strings, and in the two battery strings that are electrically connected, the non-cut surfaces of the first solar cells face the same direction; The middle busbar is electrically connected to one of the second busbars to connect two of the battery strings, and in the two battery strings that are electrically connected, the non-cut surfaces of the first solar cells face the same direction; The second edge busbar is electrically connected to one of the third busbars to connect two of the battery strings, and in the two battery strings that are electrically connected, the non-cut surfaces of the first solar cells face the same direction.

8. The photovoltaic module according to claim 7, wherein The photovoltaic module further includes: A first jumper wire that extends along a second direction, and the first jumper wire is electrically connected to the second busbars located on both sides of the first busbar; A second jumper wire that extends along the second direction, and the second jumper wire is electrically connected to the third busbars located on both sides of the first busbar and is electrically connected to the middle busbar.

9. The photovoltaic module according to claim 1, characterized in that In the battery string, adjacent solar cells are arranged with partial overlap, and the length of the region where adjacent solar cells partially overlap along the second direction is a first length, and the first length is 0 to 0.4 mm.

10. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module includes the first solar cell and the second solar cell that are cut from 51 whole solar cells.

Images