Photovoltaic module

Abstract

The embodiment of the present disclosure relates to the photovoltaic field, and particularly relates to a photovoltaic module, which comprises a plurality of cell strings, an insulation layer and a plurality of bus bars, the cell string comprises a plurality of cell pieces arranged along a first direction, the cell string comprises a head end and a tail end arranged oppositely, the cell piece comprises a first edge and a second edge arranged oppositely, and the direction in which the first edge points to the second edge is the same as the direction in which the head end points to the tail end; the insulation layer is located on a first preset area of the cell piece of the head end close to the first edge, and / or the insulation layer is located on a second preset area of the cell piece of the tail end close to the second edge, and the insulation layer extends along a second direction; at least part of the bus bars are located on a side of the insulation layer away from the cell piece, and the bus bars extend along the second direction; wherein the projection of the insulation layer on the thickness direction of the cell piece covers the projection of the bus bar on the thickness direction of the cell piece. 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 (PV) modules are crucial devices for converting solar energy into electrical energy. A PV module consists of multiple cell strings and busbars, which electrically connect adjacent cell strings. However, in related technologies, the busbars occupy additional module space, 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 cell strings, each cell string including a plurality of cells arranged along a first direction, each cell string including a head end and a tail end disposed opposite to each other, each cell including a first edge and a second edge disposed opposite to each other, wherein the direction in which the first edge points to the second edge is the same as the direction in which the head end points to the tail end; an insulating layer, the insulating layer being located on a first predetermined region of the cell at the head end near the first edge, and / or the insulating layer being located on a second predetermined region of the cell at the tail end near the second edge, the insulating layer extending along a second direction; a plurality of busbars, at least a portion of the busbars being located on the side of the insulating layer opposite to the cell, the busbars extending along the second direction; wherein the projection of the insulating layer in the thickness direction of the cell covers the projection of the busbars in the thickness direction of the cell.

[0006] In some embodiments, the thickness of the portion of the busbar that overlaps with the battery cell is 0.1 mm to 0.3 mm.

[0007] In some embodiments, the thickness of the insulating layer is 0.02 mm to 0.1 mm.

[0008] In some embodiments, the photovoltaic module further includes: solder joints located on the solar cells; wherein the solder joints are located outside the first preset region, and / or the solder joints are located outside the second preset region.

[0009] In some embodiments, the distance between the solder joint adjacent to the first edge and the first edge along the first direction is less than or equal to 8 mm, and / or the distance between the solder joint adjacent to the second edge and the second edge along the first direction is less than or equal to 8 mm.

[0010] In some embodiments, the plurality of busbars includes a first busbar, and the plurality of battery strings includes a first battery string and a second battery string arranged along the first direction, wherein the head end of the first battery string is disposed opposite to the head end of the second battery string, the battery cell located at the head end of the first battery string is a first battery cell, and the battery cell located at the head end of the second battery string is a second battery cell; the insulating layer is located on at least one of the first battery cell and the second battery cell; the first busbar is located on the side of the insulating layer opposite to the first battery cell and / or the second battery cell.

[0011] In some embodiments, the width of the first busbar along the first direction is 6mm to 18mm.

[0012] In some embodiments, the photovoltaic module further includes: a first solder strip located on the first solar cell and electrically connected to the first busbar; and a second solder strip located on the second solar cell and electrically connected to the first busbar; wherein the insulating layer is located between the first solder strip and the first solar cell, and also between the second solder strip and the second solar cell.

[0013] In some embodiments, the first busbar includes: a first portion located on the side of the insulating layer opposite to the first battery cell; a second portion located on the side of the insulating layer opposite to the second battery cell; and a connecting portion located between the first portion and the second portion.

[0014] In some embodiments, the width of the connecting portion along the first direction is less than or equal to 2 mm.

[0015] In some embodiments, the thickness of the connecting portion is greater than the thickness of the first portion, and the thickness of the connecting portion is greater than the thickness of the second portion.

[0016] In some embodiments, the thickness of the connecting portion is 0.3 mm to 0.5 mm.

[0017] In some embodiments, the plurality of busbars includes a second busbar, and the plurality of battery strings includes a first battery string and a second battery string arranged along the first direction. The head end of the first battery string is disposed opposite to the head end of the second battery string. The battery cell located at the tail end of the first battery string and the battery cell located at the tail end of the second battery string are third battery cells, and the insulating layer is located on the third battery cell. The second busbar is located on the side of the insulating layer away from the third battery cell.

[0018] In some embodiments, the photovoltaic module further includes: a third solder strip located on the third solar cell and electrically connected to the second busbar; wherein the insulating layer is located between the third solder strip and the third solar cell.

[0019] In some embodiments, the projection of the third solder strip in the thickness direction of the third battery cell does not exceed the second edge.

[0020] In some embodiments, the width of the second busbar along the first direction is 4mm to 10mm.

[0021] The technical solutions provided in this disclosure have at least the following advantages:

[0022] In the photovoltaic module technical solution provided in this disclosure, the insulating layer is disposed on the cells at the first and / or last ends, and at least part of the busbars are disposed on the side of the insulating layer away from the cells. This saves space that would otherwise be required to place some busbars on the photovoltaic module, allowing more cells or larger cells to be placed 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. Furthermore, the projection of the insulating layer along the thickness direction of the cells covers the projection of the busbars along the thickness direction of the cells, preventing short circuits caused by direct contact between the busbars and the cells, thereby improving the reliability of the photovoltaic module. Attached Figure Description

[0023] 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.

[0024] Figure 1This is a schematic diagram of a partial structure of a photovoltaic module in related technologies;

[0025] Figure 2 This is a schematic diagram of a first partial structure of a photovoltaic module provided in an embodiment of this disclosure;

[0026] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0027] Figure 4 A partial cross-sectional view of the first busbar and the solar cell in a photovoltaic module provided in this embodiment of the present disclosure;

[0028] Figure 5 This is a schematic diagram of a second partial structure of a photovoltaic module provided in an embodiment of this disclosure;

[0029] Figure 6 for Figure 5 A magnified view of part B in the middle section;

[0030] Figure 7 A cross-sectional view of the second busbar and the third battery cell;

[0031] Figure 8 Another cross-sectional view of the second busbar and the third battery cell;

[0032] Figure 9 This is another cross-sectional view of the second busbar and the third battery cell;

[0033] Figure 10 This is a schematic diagram of a third partial structure of a photovoltaic module provided in an embodiment of this disclosure;

[0034] Figure 11 for Figure 10 A magnified view of part C in the middle;

[0035] Figure 12 Another partial cross-sectional view of the first busbar and the solar cell in the photovoltaic module provided in this embodiment of the present disclosure;

[0036] Figure 13 for Figure 10 A magnified view of part D in the middle. Detailed Implementation

[0037] Figure 1 This is a schematic diagram of a partial structure of a photovoltaic module in related technologies.

[0038] refer to Figure 1The photovoltaic module includes multiple cell strings 100 and busbars. Each cell string 100 includes multiple solar cells 110 arranged along a first direction X. Each cell string 100 also includes solder strips for electrically connecting adjacent solar cells 110 and electrically connecting the solar cells 110 to the busbars. The busbars extend along a second direction Y and are connected to the end solar cells 110 of the cell strings 100.

[0039] The busbar includes a central busbar 111 and two edge busbars 121. The central busbar 111 is located between the two edge busbars 121.

[0040] like Figure 1 As shown, in the related technology, the entire busbar is set outside the solar cell 110, which occupies a certain space, resulting in a smaller number of solar cells 110 placed in the photovoltaic module, a smaller area utilization rate of the photovoltaic module, and a smaller power of the photovoltaic module.

[0041] This disclosure provides a photovoltaic module in which at least a portion of the busbars are mounted on the side of the insulation layer away from the solar cells. This saves space previously occupied by placing some busbars on the photovoltaic module, allowing for more solar cells or the use of larger solar cells without changing the module's overall size. This improves the area utilization rate of the photovoltaic module and consequently increases its power output. Furthermore, the projection of the insulation layer along the thickness direction of the solar cells covers the projection of the busbars along the thickness direction of the solar cells, preventing short circuits caused by direct contact between the busbars and the solar cells, thereby enhancing the reliability of the photovoltaic module.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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).

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] Figure 2 This is a schematic diagram of a first partial structure of a photovoltaic module provided in an embodiment of this disclosure. Figure 3 for Figure 2 A magnified view of part A in the middle; Figure 4 This is a partial cross-sectional view of the first busbar and the solar cell in a photovoltaic module provided in an embodiment of this disclosure.

[0052] refer to Figures 2 to 4 The photovoltaic module includes: multiple cell strings 200, an insulating layer 201, and multiple busbars 202. The cell strings 200 include multiple cells 210 arranged along a first direction X. The cell strings 200 include a head end 220 and a tail end 230 arranged opposite to each other. The cells 210 include a first edge 2101 and a second edge 2102 arranged opposite to each other, and the direction in which the first edge 2101 points to the second edge 2102 is the same as the direction in which the head end 220 points to the tail end 230. The insulating layer 201 is located on a first predetermined area of ​​the cells 210 at the head end 220 near the first edge 2101. At least a portion of the busbars 202 are located on the side of the insulating layer 201 away from the cells 210, and the busbars 202 extend along a second direction Y. The projection of the insulating layer 201 in the thickness direction of the cells 210 covers the projection of the busbars 202 in the thickness direction of the cells 210.

[0053] The battery string 200 includes a plurality of battery cells 210 connected in series along a first direction X.

[0054] In some embodiments, the solar cells 210 in the battery string 200 can be one or any combination of PERC (Passivated Emitter Rear Cell), IBC (Interdigitated Back Contact), TOPCON (Tunnel Oxide Passivated Contact), 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.

[0055] In some embodiments, adjacent cells 210 in the battery string 200 are spaced apart. In other embodiments, adjacent cells 210 in the battery string 200 may be partially overlapped, such as in a shingled assembly.

[0056] The direction in which the first edge 2101 points to the second edge 2102 is the same as the direction in which the head end 220 points to the second edge 2102, meaning that the direction in which the first edge 2101 points to the second edge 2102 is parallel and in the same direction as the direction in which the head end 220 points to the second edge 2102.

[0057] The battery cell 210 includes a first surface 2013 and a second surface 2014 facing each other, and the thickness direction of the battery cell 210 is parallel to the direction from the first surface 2013 to the second surface 2014.

[0058] Busbar 202 is used to electrically connect adjacent battery strings 200.

[0059] The projection of the busbar 202 in the thickness direction of the battery cell 210 refers to the orthographic projection of the busbar 202 on the second surface 2014. In some embodiments, the plurality of busbars 202 include a first busbar 212, and the plurality of battery strings 200 include a first battery string 240 and a second battery string 250 arranged along a first direction X. The first end 220 of the first battery string 240 is disposed opposite to the first end 220 of the second battery string 250. The battery cell 210 located at the first end 220 of the first battery string 240 is a first battery cell 260, and the battery cell 210 located at the first end 220 of the second battery string 250 is a second battery cell 270. An insulating layer 201 is located on at least one of the first battery cell 260 and the second battery cell 270. The first busbar 212 is located on the side of the insulating layer 201 facing away from the first battery cell 260 and / or the second battery cell 270.

[0060] In this embodiment, busbar 202 is the first busbar 212.

[0061] The first end 220 of the first battery string 240 and the first end 220 of the second battery string 250 are positioned opposite each other, such that the direction in which the first end 220 of the first battery string 240 points to the tail end 230 of the first battery string 240 is opposite to the direction in which the first end 220 of the second battery string 250 points to the tail end 230 of the second battery string 250, and the direction in which the first edge 2101 of the first battery string 240 points to the second edge 2102 of the first battery string 240 is opposite to the direction in which the first edge 2101 of the second battery string 250 points to the second edge 2102 of the second battery string 250.

[0062] The insulating layer 201 is used to prevent the first busbar 212 from directly contacting the battery cell 210 and causing a short circuit.

[0063] The projection of the insulating layer 201 in the thickness direction of the solar cell 210 refers to the orthographic projection of the insulating layer 201 onto the second surface 2014.

[0064] The insulating layer 201 can be made of silicone, epoxy resin, butyl rubber, etc.

[0065] Understandable Figures 2 to 4 The illustration shows the case where the insulating layer 201 is located on the first battery cell 260 and the second battery cell 270. In reality, the insulating layer 201 can be located only on the first battery cell 260, with the first busbar 212 located on the side of the insulating layer 201 away from the first battery cell 260. Alternatively, the insulating layer 201 can be located only on the second battery cell 270, with the first busbar 212 located on the side of the insulating layer 201 away from the second battery cell 270.

[0066] In some embodiments, the width of the first busbar 212 along the first direction X is 6mm to 18mm, for example, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm or 18mm. The width of the first busbar 212 is within the above range. A larger width of the first busbar 212 results in a smaller bulk resistance, which is beneficial for improving the power of the photovoltaic module.

[0067] In some embodiments, the photovoltaic module further includes a first solder ribbon 203 and a second solder ribbon 204. The first solder ribbon 203 is located on the first solar cell 260 and is electrically connected to the first busbar 212; the second solder ribbon 204 is located on the second solar cell 270 and is electrically connected to the first busbar 212; wherein, the insulating layer 201 is located between the first solder ribbon 203 and the first solar cell 260, and also between the second solder ribbon 204 and the second solar cell 270.

[0068] The first busbar 212 is electrically connected to both the first solder strip 203 and the second solder strip 204, so as to realize the electrical connection of the first busbar 212 to the first battery string 240 and the second battery string 250.

[0069] It is understandable that, such as Figure 2 As shown, the first solder strip 203 can be located on the surface of the first busbar 212 opposite to the first solar cell 260, and the second solder strip 204 can be located on the surface of the first busbar 212 opposite to the second solar cell 270, as shown. Figure 4 As shown, the first solder strip 203 can also be located between the first busbar 212 and the first battery cell 260, and the second solder strip 204 can also be located between the first busbar 212 and the second battery cell 270.

[0070] In some embodiments, the photovoltaic module further includes series bonding ribbons 205. The series bonding ribbons are located on the solar cells 210 and are connected in series with adjacent solar cells 210.

[0071] In some embodiments, the first busbar 212 includes a first part 2121, a second part 2122, and a connecting part 2123. The first part 2121 is located on the side of the insulating layer 201 away from the first battery cell 260; the second part 2122 is located on the side of the insulating layer 201 away from the second battery cell 270; and the connecting part 2123 is located between the first part 2121 and the second part 2122.

[0072] The first part 2121 is the portion of the first busbar 212 projected onto the first battery cell 260 in the thickness direction of the battery cell 210, the second part 2122 is the portion of the first busbar 212 projected onto the second battery cell 270 in the thickness direction of the battery cell 210, and the connecting part 2123 corresponds to the spacing between the first battery cell 260 and the second battery cell 270.

[0073] In some embodiments, the width of the connecting portion 2123 along the first direction X is less than or equal to 2 mm, for example, 0.1 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, or 2 mm. The width of the connecting portion 2123 being within the above range, i.e., the spacing between the first solar cell 260 and the second solar cell 270 along the first direction X being within the above range, can avoid the risk of cell cracking due to direct contact between the first solar cell 260 and the second solar cell 270, and can also avoid excessive spacing between the first solar cell 260 and the second solar cell 270, which would reduce the area utilization rate of the photovoltaic module.

[0074] It is understood that in other embodiments, the connecting part 2123 may be omitted, that is, the first battery cell 260 and the second battery cell 270 may directly abut against each other.

[0075] In some embodiments, the thickness of the connecting portion 2123 is greater than the thickness of the first portion 2121, and the thickness of the connecting portion 2123 is greater than the thickness of the second portion 2122. Thus, the larger thickness of the connecting portion 2123 helps to reduce the bulk resistance of the first busbar 212 and improve the power of the photovoltaic module. Furthermore, the thickness of the first portion 2121 is smaller, and the thickness of the second portion 2122 is also smaller.

[0076] The first part 2121 is the overlapping portion of the busbar 202 with the first battery cell 260. Since the entire structure of the overlapping portion of the first battery cell 260 and the busbar 202 includes the insulating layer 201 and the first part 2121, the thickness of the entire structure of the overlapping portion of the first battery cell 260 and the busbar 202 is greater than the thickness of the portion of the first battery cell 260 that does not overlap with the busbar 202. If the thickness of the first part 2121 is too large, the height of the entire structure of the overlapping portion of the first battery cell 260 and the busbar 202 will be too large compared to the height of the portion of the first battery cell 260 that does not overlap with the busbar 202. This will cause stress concentration in the overlapping portion of the first battery cell 260 and the busbar 202 during lamination, potentially leading to cracking of the first battery cell 260. Setting the thickness of the first part 2121 to be smaller can prevent cracking of the first battery cell 260 during lamination due to excessive thickness of the first part 2121.

[0077] Similarly, the second part 2122 is the overlapping portion of the busbar 202 with the second battery cell 270. Since the entire structure of the overlapping portion of the second battery cell 270 and the busbar 202 includes the insulating layer 201 and the second part 2122, the thickness of the entire structure of the overlapping portion of the second battery cell 270 and the busbar 202 is greater than the thickness of the portion of the second battery cell 270 that does not overlap with the busbar 202. If the thickness of the second part 2122 is too large, the height of the entire structure of the overlapping portion of the second battery cell 270 and the busbar 202 will be too large compared to the height of the portion of the second battery cell 270 that does not overlap with the busbar 202, causing stress concentration in the overlapping portion of the second battery cell 270 and the busbar 202 during lamination, potentially leading to cracking of the second battery cell 270. Setting the thickness of the second part 2122 to be smaller can prevent cracking of the second battery cell 270 during lamination due to excessive thickness of the second part 2122.

[0078] In some embodiments, the thickness of the connecting portion 2123 is 0.3mm to 0.5mm, for example, 0.3mm, 0.35mm, 0.4mm, 0.45mm or 0.5mm. The thickness of the connecting portion 2123 is within the above range. A larger thickness of the connecting portion 2123 is beneficial to reducing the bulk resistance of the first busbar 212 and improving the power of the photovoltaic module.

[0079] In some embodiments, the thickness of the portion of the busbar 202 that overlaps with the battery cell 210 is 0.1 mm to 0.3 mm. For example, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, or 0.3 mm. Since the entire structure of the overlapping portion of the battery cell 210 and the busbar 202 includes the insulating layer 201 and the busbar 202, the thickness of the entire structure of the overlapping portion of the battery cell 210 and the busbar 202 is greater than the thickness of the portion of the battery cell 210 that does not overlap with the busbar 202. If the thickness of the portion of the busbar 202 that overlaps with the battery cell 210 is too large, the difference between the thickness of the entire structure of the overlapping portion of the battery cell 210 and the busbar 202 and the thickness of the portion of the battery cell 210 that does not overlap with the busbar 202 will be large. That is, the height of the entire structure of the overlapping portion of the battery cell 210 and the busbar 202 will be too large compared to the height of the portion of the battery cell 210 that does not overlap with the busbar 202. This will cause stress to concentrate in the overlapping portion of the battery cell 210 and the busbar 202 during the lamination process, resulting in the battery cell 210 cracking. By ensuring that the thickness of the portion of the busbar 202 overlapping with the battery cell 210 is within the aforementioned range, and that the thickness of the busbar 202 overlapping with the battery cell 210 is relatively small, it is possible to avoid the battery cell 210 cracking during the lamination process due to the excessive thickness of the busbar 202 overlapping with the battery cell 210.

[0080] In this embodiment, the thickness of the portion of the busbar 202 that overlaps with the battery cell 210 is the thickness of the first part 2121.

[0081] In some embodiments, the thickness of the insulating layer 201 is 0.02 mm to 0.1 mm, for example 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm or 0.1 mm. Since the entire structure of the overlapping portion of the battery cell 210 and the busbar 202 includes the insulating layer 201 and the busbar 202, the thickness of the entire structure of the overlapping portion of the battery cell 210 and the busbar 202 is greater than the thickness of the portion of the battery cell 210 that does not overlap with the busbar 202. If the thickness of the insulating layer 201 is too large, the thickness of the entire structure of the overlapping portion of the battery cell 210 and the busbar 202 will differ significantly from the thickness of the portion of the battery cell 210 that does not overlap with the busbar 202. That is, the height of the entire structure of the overlapping portion of the battery cell 210 and the busbar 202 will be too large compared to the height of the portion of the battery cell 210 that does not overlap with the busbar 202. This will cause stress to concentrate in the overlapping portion of the battery cell 210 and the busbar 202 during the lamination process, resulting in the battery cell 210 cracking. By keeping the thickness of the insulating layer 201 within the aforementioned range, a smaller thickness of the insulating layer 201 can prevent the cell 210 from cracking during the lamination process due to an excessively thick insulating layer 201.

[0082] In some embodiments, the photovoltaic module further includes solder joints 206 located on the solar cell 210; wherein the solder joints 206 are located outside the first preset area. The solder joints 206 are used to electrically connect the solar cell 210 and the solder ribbon. With this configuration, the insulating layer 201 will not contact any solder joint 206, which can prevent the insulating layer 201 from affecting the current collected by the solder ribbon from the solar cell 210 due to contact between the insulating layer 201 and the solder joint 206.

[0083] In some embodiments, the distance between the solder joint 206 adjacent to the first edge 2101 and the first edge 2101 along the first direction X is less than or equal to 8 mm, for example, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, or 8 mm. Since the solder joint 206 is located outside a predetermined area, the width of the first portion 2121 along the first direction X is less than 8 mm, and the width of the second portion 2122 along the first direction X is less than 8 mm. This avoids short circuits between the first portion 2121 and the solder joint 206, and also avoids short circuits between the second portion 2122 and the solder joint 206.

[0084] The photovoltaic module also includes an end busbar 207.

[0085] The end busbar 207 is electrically connected to the tail end 230 of the battery string 200, which is the battery cell 210.

[0086] In some embodiments, the photovoltaic module further includes an encapsulating film and a cover plate, wherein the encapsulating film is used to cover the surface of the battery string 200; and the cover plate is used to cover the surface of the encapsulating film opposite to the surface of the battery string 200.

[0087] 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 battery string 200, and the second encapsulating layer covers the other of the front or back sides of the battery string 200. Specifically, at least one of the first and second encapsulating layers can be an organic encapsulating film such as polyvinyl butyral (PVB) film, ethylene-vinyl acetate copolymer (EVA) film, polyvinyl octene coelastomer (POE) film, or polyethylene terephthalate (PET) film; or, at least one of the first and second encapsulating layers can also be an EP film, EPE film, or PVP film.

[0088] Among them, 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 manufactured 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.

[0089] 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.

[0090] 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.

[0091] In this embodiment, at least a portion of the first busbar 212 is disposed on the side of the insulating layer 201 opposite to the solar cell 210 at the first end 220. This saves space by eliminating the need to place a portion of the first busbar 212 on the photovoltaic module. This allows for the placement of more solar cells 210 or the use of larger-sized solar cells 210 without changing the overall size of the photovoltaic module, thus improving the area utilization rate and consequently increasing the power output. Furthermore, the projection of the insulating layer 201 onto the thickness of the solar cell 210 covers the projection of the first busbar 212 onto the thickness of the solar cell 210, preventing short circuits caused by direct contact between the first busbar 212 and the solar cell 210, thereby improving the reliability of the photovoltaic module.

[0092] Figure 5 This is a schematic diagram of a second partial structure of a photovoltaic module provided in an embodiment of this disclosure. Figure 6 for Figure 5 A magnified view of part B in the middle section.

[0093] refer to Figure 5 and Figure 6The photovoltaic module includes: multiple cell strings 300, an insulating layer 301, and multiple busbars 302. The cell strings 300 include multiple cells 310 arranged along a first direction X. The cell strings 300 include a head end 320 and a tail end 330 arranged opposite to each other. The cells 310 include a first edge 3101 and a second edge 3102 arranged opposite to each other, and the direction in which the first edge 3101 points to the second edge 3102 is the same as the direction in which the head end 320 points to the tail end 330. The insulating layer 301 is located on a second predetermined area of ​​the cell 310 at the tail end 330 near the second edge 3102, and the insulating layer 301 extends along a second direction Y. At least a portion of the busbars 302 are located on the side of the insulating layer 301 away from the cells 310, and the busbars 302 extend along the second direction Y. The projection of the insulating layer 301 in the thickness direction of the cells 310 covers the projection of the busbars 302 in the thickness direction of the cells 310.

[0094] It should be noted that the battery string 300, battery cell 310, first end 320, last end 330 and series welding strip 305 in this embodiment can refer to the battery string 200, battery cell 210, first end 220, last end 230 and series welding strip 205 in the above embodiment.

[0095] In some embodiments, the plurality of busbars 302 include a second busbar 322, and the plurality of battery strings 300 include a first battery string 340 and a second battery string 350 arranged along a first direction X. The first end 320 of the first battery string 340 is disposed opposite to the first end 320 of the second battery string 350. The battery cell 310 located at the tail end 330 of the first battery string 340 and the battery cell 310 located at the tail end 330 of the second battery string 350 are third battery cells 380, and the insulating layer 301 is located on the third battery cell 380. The second busbar 322 is located on the side of the insulating layer 301 away from the third battery cell 380.

[0096] In this embodiment, busbar 302 is the second busbar 322.

[0097] The second busbar 322 is used for electrical connection with the end cell 310.

[0098] Figure 7 This is a cross-sectional view of the second busbar and the third battery cell. Figure 8 This is another cross-sectional view of the second busbar and the third battery cell. Figure 9 This is another cross-sectional view of the second busbar and the third battery cell.

[0099] refer to Figure 7 The second busbar 322 extends beyond the edge of the third solar cell 380; only a portion of the projection of the second busbar 322 onto the third solar cell 380 in the thickness direction of the solar cell 310. (See reference) Figure 8The edge of the second busbar 322, which is away from the first end 320, can coincide exactly with the third edge. (Reference) Figure 9 The projection of the second busbar 322 onto the thickness direction of the battery cell 310 is completely located on the third battery cell 380, and the distance between the edge of the second busbar 322 away from the first end 320 and the third edge along the first direction X can be greater than 0.

[0100] Continue to refer to Figure 5 and Figure 6 In some embodiments, the photovoltaic module further includes a third solder strip 308, which is located on the third cell 380 and electrically connected to the second busbar 322; wherein, the insulating layer 301 is located between the third solder strip 308 and the third cell 380.

[0101] The third solder strip 308 is used for electrical connection with the second busbar 322.

[0102] It is understandable that, such as Figure 5 As shown, the third solder strip 308 can be located on the surface of the second busbar 322 opposite to the third solar cell 380, as... Figure 6 As shown, the third welding strip 308 can also be located between the second busbar 322 and the third battery cell 380.

[0103] In some embodiments, the projection of the third solder strip 308 in the thickness direction of the third solar cell 380 does not exceed the second edge 3102. Thus, the length of the third solder strip 308 along the first direction X can be smaller, which helps to save on the manufacturing cost of the third solder strip 308.

[0104] In some embodiments, the width of the second busbar 322 along the first direction X is 4mm to 10mm, for example, 4mm, 6mm, 8mm or 10mm. A wider width of the second busbar 322 within the above range is beneficial for reducing the bulk resistance of the second busbar 322 and improving the power of the photovoltaic module.

[0105] In some embodiments, the thickness of the portion of the busbar 302 that overlaps with the battery cell 310 is 0.1 mm to 0.3 mm. For example, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, or 0.3 mm. The thickness of the portion of the busbar 302 that overlaps with the battery cell 310 is within the aforementioned range. The thickness of the overlapping portion of the busbar 302 is relatively small. Since the entire structure of the overlapping portion of the battery cell 310 and the busbar 302 includes the insulating layer 301 and the busbar 302, the thickness of the entire structure of the overlapping portion of the battery cell 310 and the busbar 302 is greater than the thickness of the portion of the battery cell 310 that does not overlap with the busbar 302. If the thickness of the overlapping portion of the busbar 302 with the battery cell 310 is too large, the difference between the thickness of the entire structure of the overlapping portion of the battery cell 310 and the thickness of the portion of the battery cell 310 that does not overlap with the busbar 302 will be large. That is, the height of the entire structure of the overlapping portion of the battery cell 310 and the busbar 302 will be too large compared to the height of the portion of the battery cell 310 that does not overlap with the busbar 302. This will cause stress to concentrate in the overlapping portion of the battery cell 310 and the busbar 302 during the lamination process, resulting in the battery cell 310 cracking. By ensuring that the thickness of the portion of the busbar 302 that overlaps with the battery cell 310 is within the aforementioned range, and that the thickness of the busbar 302 overlapping with the battery cell 310 is relatively small, it is possible to avoid the battery cell 310 cracking during the lamination process due to the excessive thickness of the busbar 302 overlapping with the battery cell 310.

[0106] In some embodiments, the thickness of the insulating layer 301 is 0.02 mm to 0.1 mm, for example 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm or 0.1 mm. Since the entire structure of the overlapping portion of the battery cell 310 and the busbar 302 includes the insulating layer 301 and the busbar 302, the thickness of the entire structure of the overlapping portion of the battery cell 310 and the busbar 302 is greater than the thickness of the portion of the battery cell 310 that does not overlap with the busbar 302. If the thickness of the insulating layer 301 is too large, the difference between the thickness of the entire structure of the overlapping portion of the battery cell 310 and the busbar 302 and the thickness of the portion of the battery cell 310 that does not overlap with the busbar 302 will be large. That is, the height of the entire structure of the overlapping portion of the battery cell 310 and the busbar 302 will be too large compared to the height of the portion of the battery cell 310 that does not overlap with the busbar 302. This will cause stress to concentrate in the overlapping portion of the battery cell 310 and the busbar 302 during the lamination process, resulting in the battery cell 310 cracking. By keeping the thickness of the insulating layer 301 within the aforementioned range, a smaller thickness of the insulating layer 301 can prevent the cell 310 from cracking during the lamination process due to an excessively large thickness of the insulating layer 301.

[0107] In some embodiments, the photovoltaic module further includes: solder joints 306 located on the solar cell 310; wherein the solder joints 306 are located outside the second preset area. Thus, the insulating layer 301 will not cover any solder joint 306, preventing the insulating layer 301 from covering the solder joint 306 and affecting the current collection of the solar cell 310 by the solder ribbon.

[0108] In some embodiments, the distance between the solder joint 306 adjacent to the second edge 3102 and the second edge 3102 along the first direction X is less than or equal to 8 mm, for example, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, or 8 mm. Thus, the portion of the second busbar 322 projected onto the third battery cell 380 in the thickness direction of the battery cell 310 has a length along the first direction X of less than 8 mm. This avoids short circuits caused by contact between the second busbar 322 and the solder joint 306.

[0109] In some embodiments, the photovoltaic module further includes an intermediate busbar 309.

[0110] The intermediate busbar 309 is used for electrical connection with the battery cell 310 at the first end 320 of the battery string 300.

[0111] In this embodiment, at least a portion of the second busbar 322 is disposed on the side of the insulating layer 301 facing away from the third solar cell 380. This saves space that would otherwise be required to place a portion of the second busbar 322 on the photovoltaic module. This allows for the placement of more solar cells 310 or the use of larger-sized solar cells 310 without changing the overall size of the photovoltaic module, thus improving the area utilization rate and consequently increasing the power output. Furthermore, the projection of the insulating layer 301 onto the thickness of the solar cell 310 covers the projection of the second busbar 322 onto the thickness of the solar cell 310, preventing short circuits caused by direct contact between the second busbar 322 and the solar cell 310, thereby enhancing the reliability of the photovoltaic module.

[0112] Figure 10 This is a schematic diagram of a third partial structure of a photovoltaic module provided in an embodiment of this disclosure. Figure 11 for Figure 10 A magnified view of part C in the middle; Figure 12 This is another partial cross-sectional view of the first busbar and the solar cell in a photovoltaic module provided in an embodiment of this disclosure. Figure 13 for Figure 10 A magnified view of part D in the middle.

[0113] Reference Figures 10 to 13The photovoltaic module includes: multiple cell strings 400, an insulating layer 401, and multiple busbars 402. Each cell string 400 includes multiple cells 410 arranged along a first direction X. Each cell string 400 includes a head end 420 and a tail end 430 opposite to each other. Each cell 410 includes a first edge 4101 and a second edge 4102 opposite to each other, with the direction from the first edge 4101 to the second edge 4102 being the same as the direction from the head end 420 to the tail end 430. The insulating layer 401 is located at the head end 420. The battery cell 410 is located in a first predetermined region near the first edge 4101 and in a second predetermined region near the second edge 4102 at the tail end 430. The insulating layer 401 extends along the second direction Y. At least a portion of the busbar 402 is located on the side of the insulating layer 401 away from the battery cell 410 and extends along the second direction Y. The projection of the insulating layer 401 in the thickness direction of the battery cell 410 covers the projection of the busbar 402 in the thickness direction of the battery cell 410.

[0114] It should be noted that the battery string 400, battery cell 410, first end 420, last end 430, insulating layer 401, first busbar 412 and series solder strip 405 in this embodiment can refer to the battery string 200, battery cell 210, first end 220, last end 230, insulating layer 201, first busbar 212 and series solder strip 205 in the above embodiment; the third battery cell 480 and the second busbar 422 in this embodiment can refer to the third battery cell 380 and the second busbar 322 in the above embodiment, and will not be described again here.

[0115] The multiple busbars 402 include a first busbar 412 and a second busbar 422.

[0116] In some embodiments, the thickness of the portion of the busbar 402 that overlaps with the battery cell 410 is 0.1 mm to 0.3 mm. For example, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, or 0.3 mm. Since the entire structure of the overlapping portion of the battery cell 410 and the busbar 402 includes the insulating layer 401 and the busbar 402, the thickness of the entire structure of the overlapping portion of the battery cell 410 and the busbar 402 is greater than the thickness of the portion of the battery cell 410 that does not overlap with the busbar 402. If the thickness of the portion of the busbar 402 that overlaps with the battery cell 410 is too large, the difference between the thickness of the entire structure of the overlapping portion of the battery cell 410 and the portion of the battery cell 410 that does not overlap with the busbar 402 will be large. That is, the height of the entire structure of the overlapping portion of the battery cell 410 and the busbar 402 will be too large compared to the height of the portion of the battery cell 410 that does not overlap with the busbar 402. This will cause stress to concentrate in the overlapping portion of the battery cell 410 and the busbar 402 during the lamination process, resulting in the battery cell 410 cracking. The thickness of the portion of the busbar 402 that overlaps with the battery cell 410 is within the aforementioned range. The thickness of the overlapping portion of the busbar 402 is relatively small, which can prevent the battery cell 410 from cracking during the lamination process due to the excessive thickness of the overlapping portion of the busbar 402.

[0117] In some embodiments, the thickness of the insulating layer 401 is 0.02 mm to 0.1 mm, for example 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm or 0.1 mm. Since the entire structure of the overlapping portion of the battery cell 410 and the busbar 402 includes the insulating layer 401 and the busbar 402, the thickness of the entire structure of the overlapping portion of the battery cell 410 and the busbar 402 is greater than the thickness of the portion of the battery cell 410 that does not overlap with the busbar 402. If the thickness of the insulating layer 401 is too large, the thickness of the entire structure of the overlapping portion of the battery cell 410 and the busbar 402 will differ significantly from the thickness of the portion of the battery cell 410 that does not overlap with the busbar 402. That is, the height of the entire structure of the overlapping portion of the battery cell 410 and the busbar 402 will be too large compared to the height of the portion of the battery cell 410 that does not overlap with the busbar 402. This will cause stress to concentrate in the overlapping portion of the battery cell 410 and the busbar 402 during the lamination process, resulting in the battery cell 410 cracking. By keeping the thickness of the insulating layer 401 within the aforementioned range, a smaller thickness of the insulating layer 401 can prevent the cell 410 from cracking during the lamination process due to an excessively large thickness of the insulating layer 401.

[0118] In some embodiments, the photovoltaic module further includes solder joints 406 located on the solar cell 410; wherein the solder joints 406 are located outside a first preset area and outside a second preset area. Thus, the insulating layer 401 will not cover any solder joint 406, preventing the insulating layer 401 from covering the solder joint 406 and affecting the current collection of the solar cell 410 by the solder ribbon.

[0119] In some embodiments, the distance between the solder joint 406 adjacent to the first edge 4101 and the first edge 4101 along the first direction X is less than or equal to 8 mm, for example, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, or 8 mm, and the distance between the solder joint 406 adjacent to the second edge 4102 and the second edge 4102 along the first direction X is less than or equal to 8 mm, for example, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, or 8 mm. Thus, the width of the first portion 4121 along the first direction X is less than 8 mm, and the width of the second portion 4122 along the first direction X is less than 8 mm, which can prevent short circuits between the first portion 4121 and the solder joint 406, and also prevent short circuits between the second portion 4122 and the solder joint 406. Furthermore, the portion of the second busbar 422 whose projection in the thickness direction of the battery cell 410 is located on the third battery cell 480 has a length along the first direction X of less than 8 mm, which can prevent short circuits between the second busbar 422 and the solder joint 406.

[0120] In some embodiments, the plurality of busbars 402 include a first busbar 412, and the plurality of battery strings 400 include a first battery string 440 and a second battery string 450 arranged along a first direction X. The first end 420 of the first battery string 440 is disposed opposite to the first end 420 of the second battery string 450. The battery cell 410 located at the first end 420 of the first battery string 440 is a first battery cell 460, and the battery cell 410 located at the first end 420 of the second battery string 450 is a second battery cell 470. An insulating layer 401 is located on at least one of the first battery cell 460 and the second battery cell 470. The first busbar 412 is located on the side of the insulating layer 401 facing away from the first battery cell 460 and / or the second battery cell 470.

[0121] In some embodiments, the width of the first busbar 412 along the first direction X is 6mm to 18mm, for example, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm or 18mm. The width of the first busbar 412 is within the above range. A larger width of the first busbar 412 allows for a smaller bulk resistance, which is beneficial for improving the power of the photovoltaic module.

[0122] In some embodiments, the photovoltaic module further includes a first solder ribbon 403 and a second solder ribbon 404. The first solder ribbon 403 is located on the first solar cell 460 and is electrically connected to the first busbar 412. The second solder ribbon 404 is located on the second solar cell 470 and is electrically connected to the first busbar 412. An insulating layer 401 is located between the first solder ribbon 403 and the first solar cell 460, and also between the second solder ribbon 404 and the second solar cell 470.

[0123] In some embodiments, the first busbar 412 includes a first part 4121, a second part 4122, and a connecting part 4123. The first part 4121 is located on the side of the insulating layer 401 away from the first battery cell 460; the second part 4122 is located on the side of the insulating layer 401 away from the second battery cell 470; and the connecting part 4123 is located between the first part 4121 and the second part 4122.

[0124] In some embodiments, the width of the connecting portion 4123 along the first direction X is less than or equal to 2 mm, for example, 0.1 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, or 2 mm. The width of the connecting portion 4123 being within the above range, i.e., the spacing between the first solar cell 460 and the second solar cell 470 along the first direction X being within the above range, can avoid the risk of cell cracking due to direct contact between the first solar cell 460 and the second solar cell 470, and can also avoid excessive spacing between the first solar cell 460 and the second solar cell 470, which would reduce the area utilization rate of the photovoltaic module.

[0125] It is understood that in other embodiments, the connecting part 4123 may be omitted, that is, the first battery cell 460 and the second battery cell 470 may directly abut against each other.

[0126] In some embodiments, the thickness of the connecting portion 4123 is greater than the thickness of the first portion 4121, and the thickness of the connecting portion 4123 is greater than the thickness of the second portion 4122. Thus, the larger thickness of the connecting portion 4123 helps to reduce the bulk resistance of the first busbar 412 and improve the power of the photovoltaic module. Furthermore, the thickness of the first portion 4121 is smaller, and the thickness of the second portion 4122 is also smaller.

[0127] The first part 4121 is the overlapping portion of the busbar 402 with the first battery cell 460. Since the entire structure of the overlapping portion of the first battery cell 460 and the busbar 402 includes the insulating layer 401 and the first part 4121, the thickness of the entire structure of the overlapping portion of the first battery cell 460 and the busbar 402 is greater than the thickness of the portion of the first battery cell 460 that does not overlap with the busbar 402. If the thickness of the first part 4121 is too large, the height of the entire structure of the overlapping portion of the first battery cell 460 and the busbar 402 will be too large compared to the height of the portion of the first battery cell 460 that does not overlap with the busbar 402, causing stress concentration in the overlapping portion of the first battery cell 460 and the busbar 402 during lamination, potentially leading to cracking of the first battery cell 460. The smaller thickness of the first part 4121 avoids this cracking during lamination caused by excessive thickness of the first part 4121.

[0128] Similarly, the second part 4122 is the overlapping portion of the busbar 402 with the second battery cell 470. Since the entire structure of the overlapping portion of the second battery cell 470 and the busbar 402 includes the insulating layer 401 and the second part 4122, the thickness of the entire structure of the overlapping portion of the second battery cell 470 and the busbar 402 is greater than the thickness of the portion of the second battery cell 470 that does not overlap with the busbar 402. If the thickness of the second part 4122 is too large, the height of the entire structure of the overlapping portion of the second battery cell 470 and the busbar 402 will be too large compared to the height of the portion of the second battery cell 470 that does not overlap with the busbar 402, causing stress concentration in the overlapping portion of the second battery cell 470 and the busbar 402 during lamination, potentially leading to cracking of the second battery cell 470. The smaller thickness of the second part 4122 avoids cracking of the second battery cell 470 during lamination due to excessive thickness of the second part 4122.

[0129] In some embodiments, the thickness of the connecting portion 4123 is 0.3mm to 0.5mm, for example 0.3mm, 0.35mm, 0.4mm, 0.45mm or 0.5mm.

[0130] In some embodiments, the plurality of busbars 402 include a second busbar 422, and the plurality of battery strings 400 include a first battery string 440 and a second battery string 450 arranged along a first direction X. The first end 420 of the first battery string 440 is disposed opposite to the first end 420 of the second battery string 450. The battery cell 410 located at the tail end 430 of the first battery string 440 and the battery cell 410 located at the tail end 430 of the second battery string 450 are third battery cells 480, and an insulating layer 401 is located on the third battery cell 480. The second busbar 422 is located on the side of the insulating layer 401 away from the third battery cell 480.

[0131] In some embodiments, the photovoltaic module further includes: a third solder strip 408, which is located on the third cell 480 and electrically connected to the second busbar 422; wherein, an insulating layer 401 is located between the third solder strip 408 and the third cell 480.

[0132] In some embodiments, the projection of the third solder strip 408 in the thickness direction of the third solar cell 480 does not exceed the second edge 4102. Thus, the length of the third solder strip 408 along the first direction X can be smaller, which helps to save on the manufacturing cost of the third solder strip 408.

[0133] In some embodiments, the width of the second busbar 422 along the first direction X is 4mm to 10mm, for example, 4mm, 6mm, 8mm or 10mm. A wider width of the second busbar 422 within the above range is beneficial for reducing the bulk resistance of the second busbar 422 and improving the power of the photovoltaic module.

[0134] In this embodiment, at least a portion of the first busbar 412 is disposed on the side of the insulating layer 401 opposite to the first end 420 of the solar cell 410, and at least a portion of the second busbar 422 is disposed on the side of the insulating layer 401 opposite to the third solar cell 480. This saves space by eliminating the need to place a portion of the first busbar 412 and at least a portion of the second busbar 422 on the photovoltaic module. This allows for the placement of more solar cells 410 or the use of larger-sized solar cells 410 without changing the size of the photovoltaic module, thus improving the area utilization rate of the photovoltaic module and consequently increasing its power output. Furthermore, the projection of the insulating layer 401 onto the thickness direction of the solar cell 410 covers the projection of the busbar 402 onto the thickness direction of the solar cell 410, preventing short circuits caused by direct contact between the busbar 402 and the solar cell 410, thereby improving the reliability of the photovoltaic module.

[0135] 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 head end and a tail end disposed opposite to each other, each battery cell comprising a first edge and a second edge disposed opposite to each other, wherein the direction in which the first edge points to the second edge is the same as the direction in which the head end points to the tail end; An insulating layer is located on a first predetermined region of the battery cell at the first end near the first edge, and / or the insulating layer is located on a second predetermined region of the battery cell at the tail end near the second edge, the insulating layer extending along a second direction; Multiple busbars, at least some of which are located on the side of the insulating layer opposite to the battery cell, and the busbars extend along the second direction; The projection of the insulating layer onto the thickness of the battery cell covers the projection of the busbar onto the thickness of the battery cell.

2. The photovoltaic module according to claim 1, characterized in that, The thickness of the portion of the busbar that overlaps with the battery cell is 0.1 mm to 0.3 mm.

3. The photovoltaic module according to claim 1, characterized in that, The thickness of the insulating layer is 0.02 mm to 0.1 mm.

4. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module also includes: Solder joint, the solder joint being located on the battery cell; Wherein, the solder joint is located outside the first preset area, and / or, the solder joint is located outside the second preset area.

5. The photovoltaic module according to claim 4, characterized in that, The distance between the solder joint adjacent to the first edge and the first edge along the first direction is less than or equal to 8 mm, and / or the distance between the solder joint adjacent to the second edge and the second edge along the first direction is less than or equal to 8 mm.

6. The photovoltaic module according to claim 1, characterized in that, The plurality of busbars include a first busbar, and the plurality of battery strings include a first battery string and a second battery string arranged along the first direction. The first end of the first battery string and the first end of the second battery string are disposed opposite to each other. The battery cell located at the first end of the first battery string is a first battery cell, and the battery cell located at the first end of the second battery string is a second battery cell. The insulating layer is located on at least one of the first battery cell and the second battery cell; The first busbar is located on the side of the insulating layer opposite to the first battery cell and / or the second battery cell.

7. The photovoltaic module according to claim 6, characterized in that, The width of the first busbar along the first direction is 6mm to 18mm.

8. The photovoltaic module according to claim 6, characterized in that, The photovoltaic module also includes: The first solder strip is located on the first battery cell and is electrically connected to the first busbar. The second solder strip is located on the second battery cell and is electrically connected to the first busbar. The insulating layer is located between the first solder strip and the first battery cell, and also between the second solder strip and the second battery cell.

9. The photovoltaic module according to claim 6, characterized in that, The first bus bar includes: The first part is located on the side of the insulating layer opposite to the first battery cell; The second part is located on the side of the insulating layer opposite to the second battery cell; A connecting portion, which is located between the first portion and the second portion.

10. The photovoltaic module according to claim 9, characterized in that, The width of the connecting portion along the first direction is less than or equal to 2 mm.

11. The photovoltaic module according to claim 9, characterized in that, The thickness of the connecting part is greater than the thickness of the first part, and the thickness of the connecting part is greater than the thickness of the second part.

12. The photovoltaic module according to claim 10, characterized in that, The thickness of the connecting part is 0.3mm to 0.5mm.

13. The photovoltaic module according to claim 1 or 6, characterized in that, The plurality of busbars includes a second busbar, and the plurality of battery strings includes a first battery string and a second battery string arranged along the first direction. The first end of the first battery string is disposed opposite to the first end of the second battery string. The battery cell located at the tail end of the first battery string and the battery cell located at the tail end of the second battery string are third battery cells. The insulating layer is located on the third battery cell. The second busbar is located on the side of the insulating layer away from the third battery cell.

14. The photovoltaic module according to claim 13, characterized in that, The photovoltaic module also includes: The third solder strip is located on the third battery cell and is electrically connected to the second busbar. The insulating layer is located between the third solder strip and the third battery cell.

15. The photovoltaic module according to claim 14, characterized in that, The projection of the third solder strip in the thickness direction of the third battery cell does not exceed the second edge.

16. The photovoltaic module according to claim 13, characterized in that, The width of the second busbar along the first direction is 4mm to 10mm.

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