Photovoltaic module

Abstract

The embodiment of the present disclosure relates to the photovoltaic field, and provides a photovoltaic module. The photovoltaic module comprises a plurality of cell strings and an insulation part. The cell string comprises a plurality of cell pieces arranged along a first direction. The cell string comprises a first surface and a second surface arranged oppositely. The plurality of cell strings comprises a first cell string and a second cell string. The second surface of the second cell string is overlapped on the first surface of the first cell string. The area where the second cell string is overlapped with the first cell string is an overlapping area. The cell piece comprises a first side and a second side arranged oppositely. A plurality of thin grids are arranged on the first side and the second side. The thin grids extend along a second direction. Part of the thin grids are located in the overlapping area. The insulation part is located on the overlapping area and electrically isolates the thin grids in the overlapping area of the first cell string from the thin grids in the overlapping area of the second cell string. The embodiment of the present disclosure can at least improve the power and reliability of the photovoltaic module.

Description

Technical Field

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

[0002] With global energy consumption rapidly increasing and traditional fossil fuels becoming increasingly depleted, energy and environmental issues have gradually become two major global concerns. Driven by pressure to address environmental pollution and promote sustainable development, researchers have prioritized the solar photovoltaic industry in the development and utilization of renewable energy.

[0003] Photovoltaic modules are essential devices for converting solar energy into electrical energy. A photovoltaic module consists of multiple strings of cells. In related technologies, these strings are typically spaced apart, resulting in lower area utilization and impacting the module's power output. Utility Model Content

[0004] This disclosure provides a photovoltaic module that can at least improve the power and reliability of the photovoltaic module.

[0005] According to some embodiments of this disclosure, a photovoltaic module is provided, comprising: a plurality of battery strings, each battery string including a plurality of battery cells arranged along a first direction, each battery string including a first battery string and a second battery string, the second side of the second battery string overlapping the first side of the first battery string, the area where the second battery string overlaps with the first battery string being an overlap area, each battery cell including a first side and a second side arranged opposite to each other, the first side and the second side being provided with a plurality of fine grids extending along a second direction, a portion of the fine grids being located within the overlap area; and an insulating portion located on the overlap area, which electrically isolates the fine grids in the overlap area of ​​the first battery string from the fine grids in the overlap area of ​​the second battery string.

[0006] In some embodiments, the insulating portion is located on the overlapping area of ​​the first side of the first battery string, and / or the insulating portion is located on the overlapping area of ​​the second side of the second battery string.

[0007] In some embodiments, the first surface includes a first preset region spaced apart from the overlapping region, the overlapping region and the first preset region being respectively disposed adjacent to both ends of the battery string along the second direction, and the insulating portion being located on the overlapping region and the first preset region of the first surface; and / or, the second surface includes a second preset region spaced apart from the overlapping region, the overlapping region and the second preset region being respectively disposed adjacent to both ends of the battery string along the second direction, and the insulating portion being located on the overlapping region and the second preset region of the second surface.

[0008] In some embodiments, the plurality of battery cells include adjacent first and second battery cells, with the first battery cell overlapping the second battery cell.

[0009] In some embodiments, the plurality of battery strings are arranged along a second direction, including two edge battery strings and at least one intermediate battery string located between the two edge battery strings, the intermediate battery string including two overlapping regions, and both overlapping regions being located on the first surface or both being located on the second surface.

[0010] In some embodiments, the plurality of battery strings are arranged along a second direction, including two edge battery strings and at least one intermediate battery string located between the two edge battery strings, the intermediate battery string including two overlapping regions, one overlapping region located on the first surface and the other overlapping region located on the second surface.

[0011] In some embodiments, the length of the overlapping area along the second direction is 0.1 mm to 0.29 mm.

[0012] In some embodiments, the thickness of the insulating portion is 5 μm to 40 μm.

[0013] In some embodiments, the length of the insulating portion along the second direction is 1 mm to 10 mm.

[0014] In some embodiments, the insulating portion includes a first insulating strip extending in the first direction, the first insulating strip being located on a plurality of fine grids continuously arranged on the overlapping area.

[0015] In some embodiments, the insulation portion is located on a portion of the overlapping area.

[0016] In some embodiments, the insulating portion includes at least one first insulating member that covers at least one of the fine grids in the overlapping area.

[0017] In some embodiments, the insulating portion includes at least one second insulating member located between adjacent fine grids, and the thickness of the second insulating member is greater than the height of the fine grids relative to the surface of the battery cell.

[0018] In some embodiments, the ratio of the thickness of the second insulating member to the height of the fine grid relative to the surface of the battery cell is greater than or equal to 1.5.

[0019] In some embodiments, the second insulating member includes a second insulating strip extending along the second direction.

[0020] In some embodiments, the second insulating member includes at least two insulating blocks spaced apart along the second direction.

[0021] In some embodiments, the photovoltaic module further includes: a fixing tape located on the second surface of the battery string and connecting two adjacent battery strings, the fixing tape extending along the second direction.

[0022] In some embodiments, the battery cell includes two first sides disposed opposite to each other along the first direction and two second sides disposed opposite to each other along the second direction. The battery cell also includes a corner connecting the first side and the second side. The fixing tape is located on the second side and spaced apart from the corner.

[0023] In some embodiments, the photovoltaic module further includes a busbar located on the second surface and electrically connected to at least two adjacent battery strings.

[0024] The technical solutions provided in this disclosure have at least the following advantages:

[0025] In the photovoltaic module technical solution provided in this disclosure, multiple cell strings include a first cell string and a second cell string, with the second side of the second cell string overlapping the first side of the first cell string. Compared to a scheme where the first and second cell strings are spaced apart, overlapping the first and second cell strings allows for the placement of more cell strings or the use of larger-sized cells while maintaining the same photovoltaic module size. This improves the area utilization rate of the photovoltaic module and consequently increases its power output. Furthermore, an insulating film is provided on the overlapping area of ​​the first and second cell strings to electrically isolate the fine grids in the overlapping area of ​​the first and second cell strings. This prevents short circuits between the fine grids in the overlapping areas of the first and second cell strings, thereby improving the reliability of the photovoltaic module. Attached Figure Description

[0026] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this disclosure or the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1A schematic diagram of a first and second battery string in a photovoltaic module provided in an embodiment of this disclosure;

[0028] Figure 2 A first cross-sectional view of a first and second battery string in a photovoltaic module provided in an embodiment of this disclosure;

[0029] Figure 3 A cross-sectional view of a solar cell in a photovoltaic module provided in this disclosure embodiment;

[0030] Figure 4 A schematic diagram of the structure of a first and second solar cell in a photovoltaic module provided in an embodiment of this disclosure;

[0031] Figure 5 A second cross-sectional view of the first and second battery strings in a photovoltaic module provided in an embodiment of this disclosure;

[0032] Figure 6 A third cross-sectional view of the first and second battery strings in a photovoltaic module provided in an embodiment of this disclosure;

[0033] Figure 7 A partial top view of a cell string in a photovoltaic module provided in an embodiment of this disclosure;

[0034] Figure 8 A fourth cross-sectional view of the first and second battery strings in a photovoltaic module provided in an embodiment of this disclosure;

[0035] Figure 9 A partial bottom view of a cell string in a photovoltaic module provided in an embodiment of this disclosure;

[0036] Figure 10 A fifth cross-sectional view of the first and second cell strings in a photovoltaic module provided in this embodiment of the present disclosure;

[0037] Figure 11 This is a schematic diagram of a structure of multiple battery strings in a photovoltaic module provided in an embodiment of the present disclosure;

[0038] Figure 12 This is a schematic diagram of another structure of multiple cell strings in a photovoltaic module provided in an embodiment of this disclosure;

[0039] Figure 13 This is a schematic diagram of a first structure of the insulating part in a photovoltaic module provided in an embodiment of the present disclosure;

[0040] Figure 14 This is a schematic diagram of a second structure of the insulating part in a photovoltaic module provided in an embodiment of this disclosure;

[0041] Figure 15This is a schematic diagram of a third structure of the insulating part in a photovoltaic module provided in an embodiment of this disclosure;

[0042] Figure 16 This is a schematic diagram of a fourth structure of the insulating part in a photovoltaic module provided in an embodiment of this disclosure;

[0043] Figure 17 This is a schematic diagram of a fifth structure of the insulating part in a photovoltaic module provided in an embodiment of this disclosure;

[0044] Figure 18 A cross-sectional view of the solar cells and insulation in a photovoltaic module provided in this embodiment of the present disclosure;

[0045] Figure 19 This is a schematic diagram of a photovoltaic module provided in an embodiment of the present disclosure;

[0046] Figure 20 This is a schematic diagram of the structure of a solar cell in a photovoltaic module provided in an embodiment of this disclosure. Detailed Implementation

[0047] As can be seen from the background technology, the multiple battery strings in the relevant technology are usually arranged at intervals, which results in a small area utilization rate of the photovoltaic module and affects the power of the photovoltaic module.

[0048] This disclosure provides a photovoltaic module comprising multiple cell strings, including a first cell string and a second cell string, with the second side of the second cell string overlapping the first side of the first cell string. Compared to a scheme where the first and second cell strings are spaced apart, overlapping the first and second cell strings allows for the placement of more cell strings or the use of larger-sized cells while maintaining the same photovoltaic module size. This improves the area utilization rate of the photovoltaic module and consequently increases its power output. Furthermore, an insulating film is provided in the overlapping area of ​​the first and second cell strings to electrically isolate the fine grids in the overlapping area of ​​the first and second cell strings. This prevents short circuits between the fine grids in the overlapping areas of the first and second cell strings, thereby enhancing the reliability of the photovoltaic module.

[0049] In the description of the embodiments of this disclosure, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0050] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In the description of the embodiments of this disclosure, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0053] In the description of the embodiments of this disclosure, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0054] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0055] In the accompanying drawings corresponding to the embodiments of this disclosure, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0056] In the description of embodiments of this disclosure, when a component "includes" another component, other components are not excluded unless otherwise stated, and may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly on" the other component (i.e., located on the surface of the other component with no other components between them), or another component may be present therein. Additionally, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located therein.

[0057] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0058] Figure 1 This is a schematic diagram of a first and second battery string in a photovoltaic module provided in an embodiment of this disclosure. Figure 2 A first cross-sectional view of a first and second battery string in a photovoltaic module provided in an embodiment of this disclosure; Figure 3 This is a cross-sectional view of a solar cell in a photovoltaic module provided in an embodiment of this disclosure. Figure 3 The insulating part is not shown in the diagram.

[0059] refer to Figures 1 to 3The photovoltaic module includes: multiple battery strings 10, each battery string 10 including multiple battery cells 11 arranged along a first direction X, each battery string 10 including a first surface 12 and a second surface 13 arranged opposite to each other, the multiple battery strings 10 including a first battery string 101 and a second battery string 102, the second surface 13 of the second battery string 102 overlapping the first surface 12 of the first battery string 101, the area where the second battery string 102 overlaps with the first battery string 101 is an overlap area 14, each battery cell 11 including a first side 111 and a second side 112 arranged opposite to each other, the first side 111 and the second side 112 being provided with multiple fine grids 113, the fine grids 113 extending along a second direction Y, and some of the fine grids 113 being located within the overlap area 14; the photovoltaic module also includes an insulating part 15, the insulating part 15 being located on the overlap area 14 and electrically isolating the fine grids 113 in the overlap area 14 of the first battery string 101 from the fine grids 113 in the overlap area 14 of the second battery string 102.

[0060] The multiple battery strings 10 include adjacent first battery strings 101 and second battery strings 102, with the second side 13 of the second battery string 102 overlapping the first side 12 of the first battery string 101. This allows for the placement of more battery strings 10 or the use of larger-sized solar cells 11 without changing the overall size of the photovoltaic module, which improves the area utilization of the photovoltaic module and consequently increases its power output.

[0061] The battery string 10 includes a plurality of battery cells 11 connected in series along a first direction X.

[0062] In some embodiments, the solar cells 11 in the battery string 10 can be one or any combination of TOPCON (Tunnel Oxide Passivated Contact), PERC (Passivated Emitter Rear Cell), heterojunction cells, thin-film solar cells, and tandem cells. Thin-film solar cells include, but are not limited to, perovskite thin-film solar cells, copper indium selenide (CIGS) thin-film solar cells, gallium arsenide (GaAs) thin-film solar cells, and cadmium sulfide (CdS) thin-film solar cells. Tandem cells include, but are not limited to, perovskite cells stacked with crystalline silicon cells, perovskite cells stacked with perovskite cells, and perovskite cells stacked with thin-film cells. Figure 3 The illustration uses a TOPCON battery.

[0063] Figure 4 This is a schematic diagram of the structure of a first and second solar cell in a photovoltaic module provided in an embodiment of this disclosure.

[0064] in, Figure 4 The main grid and fine grid of the solar cell are not shown in the diagram.

[0065] Reference Figure 1 and Figure 4 In some embodiments, the battery string 10 further includes a solder strip 103 for connecting two adjacent battery cells 11.

[0066] In some embodiments, the plurality of solar cells 11 include adjacent first solar cells 115 and second solar cells 116, with a portion of the first solar cells 115 overlapping the second solar cells 116. Specifically, the first solar cells 115 partially overlap the second solar cells 116. Compared to a scheme where the first solar cells 115 and the second solar cells 116 are spaced apart, the first solar cells 115 overlapping the second solar cells 116 allows for the placement of more solar cells 11 or the use of larger-sized solar cells 11 without changing the size of the photovoltaic module. This is beneficial for improving the area utilization rate of the photovoltaic module, and thus for increasing the power of the photovoltaic module.

[0067] Reference Figure 3 and Figure 4 The battery cell 11 includes a first side 111 and a second side 112 disposed opposite to each other. Multiple fine grids 113 are disposed on the first side 111 and the second side 112, and the fine grids 113 extend along a second direction Y. The polarity of the fine grids 113 on the first side 111 is different from the polarity of the fine grids 113 on the second side 112. For example, the fine grids 113 on the first side 111 are positive fine grids 113, and the fine grids 113 on the second side 112 are negative fine grids 113.

[0068] In some embodiments, the battery cell 11 further includes a main grid 114 that extends along a first direction X and is in electrical contact with the fine grid 113.

[0069] Understandably, cell 11 can be a main grid cell. The main grid cell can shorten the current conduction path and reduce internal losses, thereby increasing the power of the photovoltaic module. Cell 11 can also be a gridless cell, in which case solder ribbon 103 is used to replace the original main grid and is directly connected to the fine grid 113, which can significantly reduce silver paste consumption and thus reduce the cost of photovoltaic modules. Figure 2 and Figure 3 The image shows a battery cell 11 with a main grid 114 as an example. In reality, the battery cell 11 can also be a battery without a main grid.

[0070] For the same battery string 10, when the first battery cell 115 and the second battery cell 116 are connected, the orientation of the first side 111 of the first battery cell 115 is the same as the orientation of the second side 112 of the second battery cell 116. The fine grid 113 of the first side 111 of the first battery cell 115 is electrically contacted with the fine grid 113 of the second side 112 of the second battery cell 116 through the solder ribbon 103, so as to realize the series connection of the first battery cell 115 and the second battery cell 116.

[0071] like Figure 2 As shown, a portion of the fine grid 113 is located within the overlap region 14. The insulating portion 15 is located within the overlap region 14, thereby electrically isolating the fine grid 113 in the overlap region 14 of the first battery string 101 from the fine grid 113 in the overlap region 14 of the second battery string 102, preventing a short circuit between the fine grid 113 in the overlap region 14 of the first battery string 101 and the fine grid 113 in the overlap region 14 of the second battery string 102.

[0072] Continue to refer to Figure 2 In some embodiments, the insulating portion 15 is located on the overlapping area 14 of the first surface 12 of the first battery string 101. That is, by providing the insulating portion 15 on the overlapping area 14 of the first surface 12 of the first battery string 101, the fine grid 113 in the overlapping area 14 of the first battery string 101 is electrically isolated from the fine grid 113 in the overlapping area 14 of the second battery string 102.

[0073] In some embodiments, the insulating portion 15 is located on the overlap area of ​​the second surface 13 of the second battery string 102. That is, by providing the insulating portion 15 on the overlap area 14 of the second surface 13 of the second battery string 102, the fine grid 113 in the overlap area 14 of the first battery string 101 is electrically isolated from the fine grid 113 in the overlap area 14 of the second battery string 102.

[0074] Figure 5 This is a second cross-sectional view of the first and second battery strings in a photovoltaic module provided in an embodiment of this disclosure.

[0075] refer to Figure 5 In some embodiments, the insulating portion 15 is located on the overlapping area 14 of the first surface 12 of the first battery string 101, and the insulating portion 15 is located on the overlapping area of ​​the second surface 13 of the second battery string 102. That is, by providing the insulating portion 15 on the overlapping area 14 of the first surface 12 of the first battery string 101, the fine grid 113 in the overlapping area 14 of the first battery string 101 is electrically isolated from the fine grid 113 in the overlapping area 14 of the second battery string 102.

[0076] Figure 6 This is a third cross-sectional view of the first and second cell strings in a photovoltaic module provided in an embodiment of this disclosure. Figure 7 This is a partial top view of a cell string in a photovoltaic module provided in an embodiment of this disclosure. For ease of illustration, Figure 7 Only three battery cells are shown in the diagram.

[0077] refer to Figure 6 and Figure 7In some embodiments, the first surface 12 includes a first preset area spaced apart from the overlapping area 14. The overlapping area 14 and the first preset area are respectively disposed adjacent to the two ends of the battery string 10 along the second direction Y. The insulating part 15 is located on the overlapping area 14 and the first preset area of ​​the first surface 12.

[0078] The width of the first preset area along the second direction Y is the same as the width of the overlapping area 14 along the second direction Y.

[0079] Specifically, the first surface 12 may include a first region 121 and a second region 122. One of the first region 121 and the second region 122 is an overlapping region 14, and the other of the first region 121 and the second region 122 is a first preset region. If the battery string 10 is the first battery string 101, then the second region 122 is the overlapping region 14, and the first region 121 is the first preset region. If the battery string 10 is the second battery string 102, then the first region 121 is the overlapping region 14, and the second region 122 is the first preset region.

[0080] Insulating portions 15 are provided on both the overlapping area 14 and the first preset area of ​​the first side 12 of the battery string 10, i.e. Figure 7 Insulating parts 15 are provided on both the first region 121 and the second region 122. When manufacturing the battery string 10, it is not necessary to mass-produce the first battery string 101 and the second battery string 102 separately. The first battery string 101 and the second battery string 102 can be mass-produced at the same time, thereby improving the manufacturing efficiency of photovoltaic modules.

[0081] Figure 8 This is a fourth cross-sectional view of the first and second cell strings in a photovoltaic module provided in an embodiment of this disclosure. Figure 9 This is a partial bottom view of a cell string in a photovoltaic module provided in an embodiment of this disclosure. For ease of illustration, Figure 9 Only three battery cells are shown in the diagram.

[0082] refer to Figure 8 and Figure 9 The second surface 13 includes a second preset region spaced apart from the overlapping region 14. The overlapping region 14 and the second preset region are respectively disposed adjacent to both ends of the battery string 10 along the second direction Y. The insulating portion 15 is located on the overlapping region 14 and the second preset region of the second surface 13. In this way, the insulating portion 15 is provided on both the overlapping region 14 and the second preset region of the second surface 13 of the battery string 10. When manufacturing the battery string 10, it is not necessary to mass-produce the first battery string 101 and the second battery string 102 separately. The first battery string 101 and the second battery string 102 can be mass-produced at the same time, thereby improving the manufacturing efficiency of photovoltaic modules.

[0083] The width of the second preset area along the second direction Y is the same as the width of the overlapping area 14 along the second direction Y.

[0084] Specifically, the second surface 13 may include a third region 131 and a fourth region 132. One of the third region 131 and the fourth region 132 is an overlapping region 14, and the other of the third region 131 and the fourth region 132 is a second preset region. If the battery string 10 is the first battery string 101, then the fourth region 132 is the overlapping region 14, and the third region 131 is the second preset region. If the battery string 10 is the second battery string 102, then the third region 131 is the overlapping region 14, and the fourth region 132 is the second preset region.

[0085] Insulating portions 15 are provided on both the overlapping area 14 and the second preset area of ​​the second side 13 of the battery string 10, i.e. Figure 9 Insulating parts 15 are provided on both the third region 131 and the fourth region 132. When manufacturing the battery string 10, it is not necessary to mass-produce the first battery string 101 and the second battery string 102 separately. The first battery string 101 and the second battery string 102 can be mass-produced at the same time, thereby improving the manufacturing efficiency of photovoltaic modules.

[0086] Figure 10 This is a fifth cross-sectional view of the first and second cell strings in a photovoltaic module provided in an embodiment of this disclosure.

[0087] refer to Figure 10 The first surface 12 includes a first preset region spaced apart from the overlapping region 14. The overlapping region 14 and the first preset region are respectively located adjacent to both ends of the first battery string 101 along the second direction Y. The second surface 13 includes a second preset region spaced apart from the overlapping region 14. The overlapping region 14 and the second preset region are respectively located adjacent to both ends of the battery string 10 along the second direction Y. The insulating portion 15 is located on the overlapping region 14 and the first preset region of the first surface 12, and on the overlapping region 14 and the second preset region of the second surface 13. By providing the insulating portion 15 on the overlapping region 14 and the first preset region of the first surface 12, and on the overlapping region 14 and the second preset region of the second surface 13, the first battery string 101 and the second battery string 102 do not need to be mass-produced separately during the manufacturing of the battery string 10. Instead, the first battery string 101 and the second battery string 102 can be mass-produced uniformly, thereby improving the manufacturing efficiency of the photovoltaic module.

[0088] Figure 11 This is a schematic diagram of a structure of multiple battery strings in a photovoltaic module provided in an embodiment of this disclosure.

[0089] refer to Figure 11In some embodiments, multiple battery strings 10 are arranged along a second direction Y, including two edge battery strings 104 and at least one intermediate battery string 105 located between the two edge battery strings 104. The intermediate battery string 105 includes two overlapping regions 14, and both overlapping regions 14 are located on the first surface 12 or both are located on the second surface 13. This arrangement of multiple battery strings 10 helps to ensure the uniformity of stress experienced by the battery strings 10 during the lamination process, thereby improving the yield of photovoltaic modules.

[0090] Figure 12 This is another schematic diagram of the structure of multiple cell strings in a photovoltaic module provided in an embodiment of this disclosure.

[0091] refer to Figure 12 In some embodiments, multiple battery strings 10 are arranged along a second direction Y, including two edge battery strings 104 and at least one intermediate battery string 105 located between the two edge battery strings 104. The intermediate battery string 105 includes two overlapping regions 14, one overlapping region 14 located on a first surface 12 and the other overlapping region 14 located on a second surface 13. In this way, the stacking arrangement between adjacent battery strings 10 is simple and facilitates the automated arrangement of battery strings 10.

[0092] Figure 11 and Figure 12 The illustration shows the case where there are 4 intermediate battery strings 105. In fact, the number of intermediate battery strings can also be other values, such as 1, 2, 3, 5, etc.

[0093] Continue to refer to Figure 2 In some embodiments, the length of the overlap region 14 along the second direction Y is 0.1mm to 0.29mm, for example, 0.1mm, 0.15mm, 0.2mm, 0.25mm, or 0.29mm. The length of the overlap region 14 within this range ensures a tighter arrangement between adjacent cell strings 10, effectively saving module space. This allows for the placement of more cell strings 10 or the use of larger-sized cells 11 without changing the overall size of the photovoltaic module, thus improving the area utilization rate of the photovoltaic module and consequently increasing its power output. Furthermore, the length of the overlap region 14 within this range also prevents it from being too long, which could negatively impact the absorption of sunlight by the cell strings 10.

[0094] The insulating part 15 is used to electrically isolate the fine grid 113 in the overlapping area 14 of the first battery string 101 from the fine grid 113 in the overlapping area 14 of the second battery string 102.

[0095] The insulation portion 15 can be prepared by first printing the initial insulation portion 15 on the overlapping area 14, and then curing it with a UV lamp to transform the initial insulation portion 15 into the insulation portion 15.

[0096] The material of the insulating part 15 can be thermosetting adhesive, UV adhesive (ultraviolet curing adhesive), silicone, etc.

[0097] In some embodiments, the thickness of the insulating portion 15 is 5 μm to 40 μm, for example 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm or 40 μm. The thickness of the insulating portion 15 within the above range can effectively electrically isolate the fine grid 113 in the overlapping region 14 of the first battery string 101 from the fine grid 113 in the overlapping region 14 of the second battery string 102.

[0098] In some embodiments, the length of the insulating portion 15 along the second direction Y is 1mm to 10mm, for example 1mm, 2mm, 3mm, 5mm, 7mm or 10mm. The length of the insulating portion 15 is within the above range, which can cover the overlapping area 14 and ensure the electrical isolation effect between the fine grid 113 in the overlapping area 14 of the first battery string 101 and the fine grid 113 in the overlapping area 14 of the second battery string 102.

[0099] Figure 13 This is a schematic diagram of a first structure of the insulating part in a photovoltaic module provided in an embodiment of this disclosure.

[0100] Reference Figure 2 and Figure 13 In some embodiments, the insulating portion 15 includes a first insulating strip 151 extending in a first direction X, the first insulating strip 151 being located on a plurality of fine grids 113 continuously arranged on the overlapping area 14. The first insulating strip 151 extends along the first direction X, covering the plurality of fine grids 113 within the overlapping area 14, which can ensure electrical isolation effect and also facilitates production.

[0101] Figures 14 to 17 These are schematic diagrams of several structures of the insulating part in a photovoltaic module provided in the embodiments of this disclosure.

[0102] refer to Figures 14 to 17 In some embodiments, the insulating portion 15 is located on a portion of the overlapping area 14. This helps to reduce the manufacturing cost of the insulating portion 15.

[0103] refer to Figure 2 , Figure 14 and Figure 15 In some embodiments, the insulating portion 15 includes at least one first insulating member 152, which covers at least one fine grid 113 within the overlapping area 14. When the insulating portion 15 includes a plurality of first insulating members 152 and the plurality of first insulating members 152 are spaced apart, the material of the insulating portion 15 is advantageous.

[0104] Figure 18This is a cross-sectional view of the solar cells and insulation in a photovoltaic module provided in an embodiment of this disclosure.

[0105] refer to Figure 2 , Figure 16 and Figure 18 In some embodiments, the insulating portion 15 includes at least one second insulating member 153, which is located between adjacent fine grids 113, and the thickness of the second insulating member 153 is greater than the height of the fine grids 113 relative to the surface of the battery cell 11. The second insulating member 153 may not be in direct contact with the fine grids 113, and is disposed between adjacent fine grids 113. The second insulating member 153 is relatively thick, so it can play a supporting role, ensuring that the fine grids 113 in the overlapping area 14 of the first battery string 101 do not contact the fine grids 113 in the overlapping area 14 of the second battery string 102, thereby avoiding short circuits.

[0106] The thickness of the second insulating member 153 is greater than the height of the fine grid 113 relative to the surface of the battery cell 11, meaning that the surface of the second insulating member 153 facing away from the battery cell 11 is higher than the surface of the fine grid 113 facing away from the battery cell 11.

[0107] In some embodiments, the ratio of the thickness of the second insulating member 153 to the height of the fine grid 113 relative to the surface of the battery cell 11 is greater than or equal to 1.5, for example, 1.5, 1.6, 1.8, 2, 2.5, 3, 3.5, or 4. When the ratio of the thickness of the second insulating member 153 to the height of the fine grid 113 relative to the surface of the battery cell 11 is within the aforementioned range, it can further ensure that the fine grid 113 in the overlapping area 14 of the first battery string 101 does not contact the fine grid 113 in the overlapping area 14 of the second battery string 102, further preventing short circuits.

[0108] refer to Figure 2 and Figure 16 In some embodiments, the second insulating member 153 includes a second insulating strip 1531 extending along the second direction Y. The strip-shaped insulating strip provides better support and can effectively ensure that there is no electrical contact between the fine grid 113 in the overlapping area 14 of the first battery string 101 and the fine grid 113 in the overlapping area 14 of the second battery string 102, thereby avoiding the occurrence of short circuits.

[0109] refer to Figure 17 In some embodiments, the second insulating member 153 includes at least two insulating blocks 1532 arranged at intervals along the second direction Y. This is advantageous for saving material of the second insulating member 153.

[0110] It should be noted that, Figure 17The diagram illustrates the circular shape of the insulating block 1532. However, the insulating block 1532 can also be triangular, quadrilateral, polygonal, elliptical, etc. Furthermore, Figures 14 to 18 The illustration shows that the insulating portions in one overlapping area are of the same structure. In reality, the insulating portions in the same overlapping area can have multiple structures. For example, the insulating portions in the same overlapping area can simultaneously include a first insulating element and a second insulating element. In multiple overlapping areas of a photovoltaic module, the structures of the insulating portions in different overlapping areas can be the same or different, and the embodiments disclosed herein do not limit this.

[0111] Figure 19 This is a schematic diagram of a photovoltaic module provided in an embodiment of this disclosure. Figure 19 The insulating part is not shown in the diagram.

[0112] refer to Figure 2 and Figure 19 In some embodiments, the photovoltaic module further includes a fixing tape 16 located on the second side 13 of the battery string 10 and connecting two adjacent battery strings 10, the fixing tape 16 extending along the second direction Y.

[0113] The fixing tape 16 is used to fix adjacent battery strings 10 to prevent relative displacement of the battery strings 10 during transportation or lamination, and to ensure that the battery strings 10 are kept in the preset position, thereby ensuring the reliability of the photovoltaic module.

[0114] Figure 20 This is a schematic diagram of the structure of a solar cell in a photovoltaic module provided in an embodiment of this disclosure.

[0115] refer to Figure 19 and Figure 20 In some embodiments, the battery cell 11 includes two first sides 117 arranged opposite each other along a first direction X and two second sides 118 arranged opposite each other along a second direction Y. The battery cell 11 also includes a corner 119, which connects the first sides 117 and the second sides 118. The fixing tape 16 is located on the second side 118 and spaced apart from the corner 119.

[0116] The solar cell 11 is typically formed by laser or mechanical cutting. The cut edges at the corner 119 are more prone to retaining defects such as microcracks and chipping. These micro-defects become "weak points" in stress transmission. If the fixing tape 16 covers this area, even a small external force can cause the microcracks to propagate, leading to the failure of the solar cell 11. Therefore, by alternating the fixing tape 16 with the corner 119, the failure of the solar cell 11 caused by the fixing tape 16 covering the corner 119 can be avoided.

[0117] Continue to refer to Figure 2 and Figure 19 In some embodiments, the photovoltaic module further includes a busbar 17, which is located on the second surface 13 and electrically connects at least two adjacent cell strings 10. Placing the busbar 17 on the second surface 13 saves space in the photovoltaic module, allowing for the placement of more cells 11 or the use of larger cells 11 without changing the overall size of the photovoltaic module. This improves the area utilization rate of the photovoltaic module and consequently increases its power output.

[0118] Busbar 17 is electrically connected to the adjacent battery string 10 via a welding strip.

[0119] When the busbar 17 connects two adjacent battery strings 10 arranged along the second direction Y, the busbar 17 can play a certain role in fixing them. Therefore, there is no need to install fixing tape 16 at the location of the busbar 17, which helps to save the cost of fixing tape 16.

[0120] In some embodiments, the photovoltaic module further includes an encapsulating film (not shown) and a cover plate (not shown), the encapsulating film being used to cover the surface of the battery string and the cover plate being used to cover the surface of the encapsulating film away from the battery string.

[0121] In some embodiments, the encapsulating film includes a first encapsulating layer and a second encapsulating layer. The first encapsulating layer covers one of the front or back sides of the solar cell, and the second encapsulating layer covers the other of the front or back sides of the solar cell. Specifically, at least one of the first or second encapsulating layer can be an organic encapsulating film such as polyvinyl butyral (PVB) film, ethylene-vinyl acetate copolymer (EVA) film, polyvinyl octene elastomer (POE) film, or polyethylene terephthalate (PET) film. Alternatively, at least one of the first or second encapsulating layer can also be an EP film, an EPE film, or a PVP film. Here, EP film refers to a co-extruded film composed of stacked EVA film and POE film; EPE film refers to a co-extruded film formed by sequentially stacking EVA film, POE film, and EVA film; and PVP film refers to a co-extruded film formed by stacking POE film, EVA film, and POE film. Co-extruded films can be prepared by sequentially extruding one or more raw materials onto another pre-made film during the film processing, or by bonding different types of pre-made films together.

[0122] In some cases, the first encapsulation layer and the second encapsulation layer still have a boundary line before lamination. After lamination, the photovoltaic module no longer has the concept of a first encapsulation layer and a second encapsulation layer, that is, the first encapsulation layer and the second encapsulation layer have formed an integral encapsulation film.

[0123] In some embodiments, the cover plate can be a glass cover plate, a plastic cover plate, or other cover plate with light-transmitting function. Specifically, the surface of the cover plate facing the encapsulating film can be an uneven surface or a textured surface containing multiple raised structures, thereby increasing the utilization rate of incident light. The cover plate includes a first cover plate and a second cover plate, the first cover plate being opposite to the first encapsulation layer, and the second cover plate being opposite to the second encapsulation layer.

[0124] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of this disclosure. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this disclosure; therefore, the scope of protection of this disclosure should be determined by the scope defined in the claims.

Claims

1. A photovoltaic module, characterized in that, include: Multiple battery strings, each battery string comprising multiple battery cells arranged along a first direction, each battery string comprising a first side and a second side disposed opposite to each other, the multiple battery strings comprising a first battery string and a second battery string, the second side of the second battery string overlapping the first side of the first battery string, the area of ​​the second battery string overlapping the first battery string being an overlapping area, each battery cell comprising a first side and a second side disposed opposite to each other, the first side and the second side being provided with multiple fine grids, the fine grids extending along a second direction, a portion of the fine grids being located within the overlapping area; An insulating portion is located on the overlap area and electrically isolates the fine grid in the overlap area of ​​the first battery string from the fine grid in the overlap area of ​​the second battery string.

2. The photovoltaic module according to claim 1, characterized in that, The insulating portion is located on the overlapping area of ​​the first side of the first battery string, and / or the insulating portion is located on the overlapping area of ​​the second side of the second battery string.

3. The photovoltaic module according to claim 1, characterized in that, The first surface includes a first preset area spaced apart from the overlapping area. The overlapping area and the first preset area are respectively located adjacent to both ends of the battery string along the second direction. The insulating portion is located on the overlapping area and the first preset area of ​​the first surface. And / or, The second surface includes a second preset area spaced apart from the overlapping area. The overlapping area and the second preset area are respectively located adjacent to both ends of the battery string along the second direction. The insulating portion is located on the overlapping area and the second preset area of ​​the second surface.

4. The photovoltaic module according to claim 1, characterized in that, The plurality of battery cells include adjacent first and second battery cells, with the first battery cell overlapping the second battery cell.

5. The photovoltaic module according to claim 1, characterized in that, The plurality of battery strings are arranged along a second direction, including two edge battery strings and at least one intermediate battery string located between the two edge battery strings. The intermediate battery string includes two overlapping regions, and both overlapping regions are located on the first surface or both are located on the second surface.

6. The photovoltaic module according to claim 1, characterized in that, The plurality of battery strings are arranged along a second direction, including two edge battery strings and at least one intermediate battery string located between the two edge battery strings. The intermediate battery string includes two overlapping regions, one of which is located on the first surface and the other of which is located on the second surface.

7. The photovoltaic module according to claim 1, characterized in that, The length of the overlapping area along the second direction is 0.1mm to 0.29mm.

8. The photovoltaic module according to claim 1, characterized in that, The thickness of the insulating part is 5μm to 40μm.

9. The photovoltaic module according to claim 1, characterized in that, The length of the insulating part along the second direction is 1mm to 10mm.

10. The photovoltaic module according to claim 1, characterized in that, The insulating portion includes a first insulating strip extending in the first direction, the first insulating strip being located on a plurality of fine grids continuously arranged on the overlapping area.

11. The photovoltaic module according to claim 1, characterized in that, The insulating portion is located on a portion of the overlapping area.

12. The photovoltaic module according to claim 11, characterized in that, The insulating portion includes at least one first insulating member that covers at least one of the fine grids in the overlapping area.

13. The photovoltaic module according to claim 11, characterized in that, The insulating portion includes at least one second insulating member located between adjacent fine grids, and the thickness of the second insulating member is greater than the height of the fine grids relative to the surface of the battery cell.

14. The photovoltaic module according to claim 13, characterized in that, The ratio of the thickness of the second insulating member to the height of the fine grid relative to the surface of the battery cell is greater than or equal to 1.

5.

15. The photovoltaic module according to claim 13, characterized in that, The second insulating element includes a second insulating strip extending along the second direction.

16. The photovoltaic module according to claim 13, characterized in that, The second insulating element includes at least two insulating blocks spaced apart along the second direction.

17. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module also includes: A fixing tape is located on the second surface of the battery string and connects two adjacent battery strings, the fixing tape extending along the second direction.

18. The photovoltaic module according to claim 17, characterized in that, The battery cell includes two first sides arranged opposite each other along the first direction and two second sides arranged opposite each other along the second direction. The battery cell also includes a corner, which connects the first side and the second side. The fixing tape is located on the second side and spaced apart from the corner.

19. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module also includes: A busbar is located on the second surface and electrically connects at least two adjacent battery strings.

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