A photovoltaic module

Abstract

This application discloses a photovoltaic module, including: multiple cell strings and a busbar; the cell strings include multiple cells arranged along a first direction, with adjacent cells at least partially overlapping to form an overlap portion; the busbar is disposed on the back of the cell string, and the busbar at least partially overlaps the overlap portion; the busbar is electrically connected to the cell via an electrical component; and an insulating layer is provided on the side of the busbar facing the overlap portion. This at least partial overlap between the busbar and the overlap portion saves the cell layout space required for the busbar in the photovoltaic module, and avoids the busbar from obstructing other parts of the back of the cell, allowing the electrodes on the cell to be positioned as close to the edge of the cell as possible, thereby improving the current collection capacity of the cell edge area. Simultaneously, during the hot-pressing process of the photovoltaic module, the insulating layer also acts as a buffer between the busbar and the overlap portion, thereby reducing the risk of cracking at the overlap point of the cell.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic technology, specifically relating to a photovoltaic module. Background Technology

[0002] With the continuous development of photovoltaic technology, maximizing the conversion efficiency of solar photovoltaic modules has always been a key research focus. In existing photovoltaic modules, during the cell arrangement process, a certain amount of space needs to be reserved in the middle and on both sides of the entire cell array for the placement of busbars to facilitate the welding of the busbars to the solder strips. This results in the busbars occupying a significant portion of the internal space of the photovoltaic module, preventing some of the module's space from being directly used for power generation and thus affecting the conversion efficiency of the photovoltaic module. Utility Model Content

[0003] This application aims to provide a photovoltaic module that can solve the problem that the busbars in existing photovoltaic modules occupy too much internal space, thus affecting the conversion efficiency of the photovoltaic module.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows:

[0005] In a first aspect, embodiments of this application propose a photovoltaic module, including: multiple battery strings and a busbar;

[0006] The battery string includes a plurality of battery cells arranged along a first direction, and two adjacent battery cells at least partially overlap to form an overlapping portion. The busbar is disposed on the back side of the battery string, and the busbar at least partially overlaps the overlapping portion. The busbar is electrically connected to the battery cells through an electrical component, and the side of the busbar facing the overlapping portion is provided with an insulating layer.

[0007] Optionally, the busbar extends beyond the overlapping portion on both sides along the first direction; and / or, the insulating layer extends beyond the busbar on both sides along the first direction.

[0008] Optionally, the busbar has a first side and a second side disposed opposite to each other along the first direction, the first side extending beyond the overlapping portion by a width of D1, and the second side extending beyond the overlapping portion by a width of D2, satisfying: 0≤|D1-D2|≤7mm.

[0009] Optionally, the width D1 of the first side extending beyond the overlapping portion satisfies: 0mm≤D1≤7mm;

[0010] And / or, the width D2 of the second side extending beyond the overlapping portion satisfies: 0mm ≤ D2 ≤ 7mm.

[0011] Optionally, the insulating layer extends continuously from one side of the battery cell to the other side along a second direction, the second direction being perpendicular to the first direction.

[0012] Optionally, the width of the busbar in the first direction is d1, and the width of the insulating layer in the first direction is d2, satisfying that d2-d1≥0.5mm.

[0013] Optionally, the plurality of solar cells include a first solar cell disposed along the first direction closest to the edge of the photovoltaic module, and a second solar cell adjacent to the first solar cell along the first direction, wherein the first solar cell and the second solar cell at least partially overlap to form the overlapping portion;

[0014] The busbar includes a first busbar, the insulating layer includes a first insulating layer, the first busbar is disposed between the first battery cell and the second battery cell, and the first busbar at least partially overlaps with the overlapping portion, the first busbar is electrically connected to the first battery cell through the electrical component, and the first insulating layer is disposed on the side of the first busbar facing the overlapping portion.

[0015] Optionally, the electrical component includes a first electrical component and a second electrical component with opposite conductivity types. The back sides of both the first and second battery cells are provided with the first electrical component and the second electrical component arranged alternately along a second direction, which intersects with the first direction.

[0016] The first electrical component on the first battery cell is electrically connected to the first busbar, and the second electrical component on the first battery cell is interconnected with the first electrical component on the second battery cell to form an electrical connection structure, and at least part of the first insulating layer is disposed between the electrical connection structure and the first busbar; the second electrical component on the second battery cell is disconnected from the first busbar.

[0017] Optionally, the first electrical component on the first battery cell is electrically connected to the side of the first busbar facing the battery cell, or the first electrical component on the first battery cell is electrically connected to the side of the first busbar away from the battery cell.

[0018] Optionally, the first insulating layer along the first direction has a third side facing the first battery cell and a fourth side facing the second battery cell, the third side extending beyond the width of the first busbar by a width D3, and the fourth side extending beyond the width of the first busbar by a width D4, satisfying: D3 > D4.

[0019] Optionally, the plurality of solar cells include a third solar cell and a fourth solar cell located at the middle position of the photovoltaic module, wherein the third solar cell and the fourth solar cell are arranged adjacent to each other along the first direction and at least partially overlap to form the overlapping portion;

[0020] The busbar includes a second busbar, the insulating layer includes a second insulating layer, the second busbar is disposed between the third battery cell and the fourth battery cell, the second busbar at least partially overlaps with the overlapping portion, the second busbar is electrically connected to the third battery cell and the fourth battery cell respectively through the electrical components, and the second insulating layer is disposed on the side of the second busbar facing the overlapping portion.

[0021] Optionally, the electrical components include a third electrical component and a fourth electrical component with opposite conductivity types. The back sides of both the third and fourth battery cells are provided with the third electrical component and the fourth electrical component arranged alternately along a second direction, which intersects with the first direction.

[0022] The third electrical component on the third battery cell and the third electrical component on the fourth battery cell are respectively electrically connected to the second busbar, and the fourth electrical component on the third battery cell and the fourth electrical component on the fourth battery cell are respectively disconnected from the second busbar.

[0023] Optionally, the third electrical component is electrically connected to the side of the second busbar facing the battery cell, or the third electrical component is electrically connected to the side of the second busbar away from the battery cell.

[0024] Optionally, the back of the battery cell is provided with a plurality of electrodes spaced apart in the first direction; the vertical distance between the electrode closest to the edge of the battery cell along the first direction and the edge of the battery cell is y; the back of the battery cell is also provided with a plurality of electrical connection portions, each of the electrical connection portions being electrically connected to at least one of the electrodes, the vertical distance between the electrical connection portion closest to the edge of the battery cell along the first direction and the edge of the battery cell is x; the width of the overlapping portion in the first direction is c, and the width of the busbar in the first direction is d1, satisfying: 2y+c≤d1≤2x-c-2y.

[0025] In this application, by making two adjacent solar cells at least partially overlap to form an overlapping portion, the arrangement of solar cells in the photovoltaic module can be made more compact, thereby making full use of the space within the photovoltaic module. Simultaneously, placing the busbar at the overlap of two adjacent solar cells, with the busbar at least partially overlapping the overlapping portion, saves the solar cell arrangement space required for the busbar in the photovoltaic module, and avoids the busbar obstructing other parts of the back of the solar cell. This allows the electrodes on the solar cell to be positioned as close to the edge as possible, thus improving the current collection capacity of the edge area of ​​the solar cell and improving the efficiency of the photovoltaic module. It also facilitates the formation of an electrical connection between the busbar and the corresponding electrode on the solar cell via electrical components. Furthermore, by providing an insulating layer on the side of the busbar facing the overlapping portion, this insulating layer serves both as insulation and isolation between the busbar and the dissimilar electrodes on the solar cell, and as a buffer between the busbar and the overlapping portion during the hot-pressing process of the photovoltaic module, thereby reducing the risk of cracking of the solar cell at the overlap.

[0026] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below, wherein:

[0028] Figure 1 This is a schematic diagram of a photovoltaic module according to an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the structure of a photovoltaic module with a first busbar according to an embodiment of this application;

[0030] Figure 3 yes Figure 2 A schematic diagram of the first structure of part A, shown in the middle circle;

[0031] Figure 4 yes Figure 2 A schematic diagram of the second structure of part A, shown in the middle circle;

[0032] Figure 5 It is along Figure 2 The first structural cross-sectional view of the EE line;

[0033] Figure 6 It is along Figure 2 The second structural cross-sectional view of the EE line;

[0034] Figure 7 It is along Figure 2 The third structural cross-sectional view of the EE line;

[0035] Figure 8 This is a schematic diagram of a photovoltaic module with a second busbar according to an embodiment of this application;

[0036] Figure 9 yes Figure 8 The first structural diagram of part B is shown in the middle circle;

[0037] Figure 10 yes Figure 8 The second structural diagram of part B is shown in the middle circle;

[0038] Figure 11 It is along Figure 8 A cross-sectional view of the MM line;

[0039] Figure 12 It is along Figure 8 The first structural cross-sectional view of the NN line;

[0040] Figure 13 It is along Figure 8 The second structural cross-sectional view of the NN line;

[0041] Figure 14 This is a schematic diagram of the arrangement of two adjacent battery cells according to an embodiment of this application;

[0042] Figure 15 This is a schematic diagram of the arrangement of multiple battery cells according to an embodiment of this application.

[0043] Figure label:

[0044] 1: Battery string; 10: Battery cell; 10a: Overlapping portion; 11: Electrode; 12: Electrical connection portion; 101: First battery cell; 102: Second battery cell; 103: Third battery cell; 104: Fourth battery cell; 2: Busbar; 2a: First side; 2b: Second side; 21: First busbar; 22: Second busbar; 3: Electrical component; 31: First electrical component; 32: Second electrical component; 31a: Electrical connection structure; 33: Third electrical component; 34: Fourth electrical component; 4: Insulating layer; 41: First insulating layer; 41a: Third side; 41b: Fourth side; 42: Second insulating layer; X: First direction; Y: Second direction. Detailed Implementation

[0045] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0046] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0047] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] The photovoltaic modules provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0050] like Figure 1 , Figure 4 and Figure 5As shown, a photovoltaic module according to some embodiments of this application includes: a plurality of battery strings 1 and a busbar 2; the battery strings 1 include a plurality of battery cells 10 arranged along a first direction X, and adjacent two battery cells 10 at least partially overlap to form an overlap portion 10a; the busbar 2 is disposed on the back side of the battery strings 1, the busbar 2 at least partially overlaps with the overlap portion 10a, the busbar 2 is electrically connected to the battery cells 10 through an electrical component 3, and an insulating layer 4 is provided on the side of the busbar 2 facing the overlap portion 10a.

[0051] In this embodiment, by making two adjacent solar cells 10 at least partially overlap to form an overlapping portion 10a, the arrangement of solar cells 10 in the photovoltaic module can be made more compact, thereby making full use of the space within the photovoltaic module. Simultaneously, by placing the busbar 2 at the overlap of two adjacent solar cells 10 and making the busbar 2 at least partially overlap with the overlapping portion 10a, the space occupied by the solar cells 10 for the busbar 2 in the photovoltaic module can be saved, and the busbar 2 can avoid obstructing other parts of the back of the solar cell 10. This allows the electrodes 11 on the solar cell 10 to be positioned as close as possible to the edge of the solar cell 10, thereby improving the current collection capability of the edge area of ​​the solar cell 10 and thus improving the efficiency of the photovoltaic module. It also facilitates the formation of an electrical connection between the busbar 2 and the electrodes on the corresponding solar cell through the electrical component 3. Furthermore, in this application, an insulating layer 4 is provided on the side of the busbar 2 facing the overlapping portion 10a. The insulating layer 4 can not only provide insulation and isolation between the busbar 2 and the opposite electrode 11 on the solar cell 10, but also act as a buffer between the busbar 2 and the overlapping portion 10a during the hot pressing process of the photovoltaic module, thereby reducing the risk of cracking of the solar cell 10 at the overlap.

[0052] Specifically, a photovoltaic module may include a front glass, a backsheet, an encapsulating film layer, and multiple cell strings 1. The front glass and backsheet are stacked, the encapsulating film layer is disposed between the front glass and the backsheet, and the multiple cell strings 1 are arranged to form a cell layer. The cell layer is embedded in the encapsulating film layer to encapsulate and protect the cell layer. Figure 1 As shown, the battery string 1 includes multiple battery cells 10, which are arranged along a first direction X. Adjacent battery cells 10 overlap each other along the first direction X, forming an overlapping portion 10a at the overlap. A busbar 2 is then placed at the overlap, so that the busbar 2 at least partially overlaps with the overlapping portion 10a.

[0053] Among them, such as Figure 13As shown, the solar cell 10 has multiple electrodes 11 arranged at intervals along a first direction X. An electrical component 3 is provided on the solar cell 10, with one end of the component 3 electrically connected to the electrode 11 and the other end electrically connected to the busbar 2. The electrodes 11 collect the current generated by the solar cell 10, and the current is transmitted to the busbar 2 via the electrical component 3. The current is then combined by the busbar 2 and discharged into the photovoltaic module. It is understood that the electrodes 11 on the solar cell 10 include positive and negative electrodes. The busbar 2 connects electrodes 11 of the same polarity on the same solar cell 10. The specific connection structure can be flexibly set according to the cell layout structure in the photovoltaic module and is not limited here.

[0054] It should be noted that in traditional photovoltaic modules, multiple solar cells 10 are connected in series to form a cell string 1, and then the multiple cell strings 1 are arranged to form a complete cell layer. Typically, blank areas need to be reserved in the middle and on both sides of the complete cell layer to accommodate the busbar 2. To avoid short-circuiting between the busbar 2 and the solar cells 10, the busbar 2 and the cell string 1 need to be staggered by a certain distance. This results in the busbar 2 occupying a large amount of space within the photovoltaic module, preventing the front side (i.e., the light-receiving surface) of the photovoltaic module from being fully covered with solar cells 10, thus underutilizing the front light-receiving area of ​​the photovoltaic module.

[0055] In this application, by overlapping two adjacent solar cells 10 to form an overlapping portion 10a, and placing the busbar 2 on the back side (i.e., the backlight side) of the overlapping portion 10a, it is not necessary to reserve a blank area specifically for the busbar 2 when arranging the solar cells 10. This reduces the impact of the busbar 2 on the arrangement of the solar cells 10, making the structure of the photovoltaic module more compact and allowing full utilization of the front light-receiving area of ​​the photovoltaic module, thereby improving the efficiency of the photovoltaic module. At the same time, by at least partially overlapping the busbar 2 with the overlapping portion 10a, the shading of other parts of the solar cell 10 by the busbar 2 is reduced, so that the electrodes 11 on the solar cell 10 can be placed as close as possible to the edge of the solar cell 10, thereby helping to improve the current collection capability of the electrodes 11 in the edge area of ​​the solar cell 10. Furthermore, placing the busbar 2 at the overlap of two solar cells 10 also reduces the interference of the busbar 2 on other structures on the back side of the solar cell 10, facilitating actual processing operations.

[0056] Furthermore, an insulating layer 4 is provided on the side of the busbar 2 facing the overlapping portion 10a. The insulating layer 4 is used to insulate and isolate the busbar 2 from the opposite electrode 11 on the solar cell 10. At the same time, during the hot pressing process of the photovoltaic module, the material of the insulating layer 4 can be softened by heat. On the one hand, it can act as a stress buffer between the busbar 2 and the overlapping portion 10a, preventing the solar cell 10 from cracking under pressure at the overlapping portion 10a. On the other hand, the two solar cells 10 form a stepped structure at the overlap. When the material of the insulating layer 4 is softened by heat, it has a certain fluidity and can flow and fill the stepped structure, thereby compensating for the height difference at the stepped structure. This can reduce the stress concentration at the overlapping portion 10a and further reduce the risk of the solar cell 10 cracking under pressure at the overlapping portion 10a.

[0057] In some embodiments, the insulating layer 4 may be made of insulating film, insulating adhesive or insulating tape, etc. The insulating layer 4 may be formed by laying insulating film or insulating tape on the overlapping portion 10a, or by coating insulating adhesive on the overlapping portion 10a.

[0058] Specifically, the material of the insulating layer 4 can be one or more of the following: ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE), polyethylene terephthalate (PET), pearl cotton (EPE), etc. Of course, the insulating layer 4 can also be made of other materials, which are not limited here.

[0059] In some implementations, the thickness of the insulation layer 4 ranges from 1mm to 3mm. For example, the thickness of the insulation layer 4 can be set to 1mm, 1.2mm, 1.5mm, 1.7mm, 2mm, 2.5mm, 3mm, etc.

[0060] Among them, such as Figure 5 and Figure 6 As shown, the insulating layer 4 extends beyond the busbar 2 on both sides along the first direction X. This ensures the insulating layer 4 provides insulation between the busbar 2 and the opposite electrodes 11 on the battery cell 10. At the same time, it ensures that the insulating layer 4 can extend a certain amount on both sides to flow during the hot pressing process to fill and compensate for the height difference formed by the overlap of the battery cell 10, thereby reducing the risk of the battery cell 10 cracking under pressure.

[0061] In other embodiments, such as Figure 5 and Figure 6As shown, the sides of the busbar 2 extend beyond the overlapping portion 10a along the first direction X. This ensures that the busbar 2 has sufficient width to facilitate the connection and fixation between the busbar 2 and the electrical component 3, thereby improving the connection strength between the busbar 2 and the electrical component 3. Simultaneously, the busbar 2 completely covers the overlapping portion 10a in the first direction X. Therefore, during the hot pressing process, the pressure transmitted by the busbar 2 can be evenly distributed to different positions of the overlapping portion 10a, resulting in a more balanced overall stress on the overlapping portion 10a. This avoids cracking of the battery cells 10 at the overlapping portion 10a due to uneven local stress.

[0062] Optionally, such as Figure 5 , Figure 6 and Figure 11 As shown, the busbar 2 has a first side 2a and a second side 2b disposed opposite to each other along a first direction X. The width of the first side 2a extending beyond the overlapping portion 10a is D1, and the width of the second side 2b extending beyond the overlapping portion 10a is D2, satisfying: 0mm ≤ |D1-D2| ≤ 7mm. Preferably, the width D1 is equal to the width D2.

[0063] In this embodiment of the application, by setting the range of the difference between the width D1 and the width D2, it is ensured that the force distribution on both sides of the overlapping part 10a is more uniform during the hot pressing process, thereby reducing the risk of cracking of the battery cell 10 at the overlapping part 10a.

[0064] Wherein, |D1-D2| refers to the absolute value of the difference between the width D1 and the width D2, and |D1-D2| can be set to: 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, etc.

[0065] In some embodiments, such as Figure 5 and Figure 6 As shown, the width D1 of the first side 2a extending beyond the overlapping portion 10a satisfies: 0mm ≤ D1 ≤ 7mm. For example, the width D1 can be set to 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, etc.

[0066] In this embodiment, by setting the width D1 of the first side 2a of the busbar 2 extending beyond the overlapping portion 10a to within the range of 0mm-7mm, it can be ensured that the first side 2a of the busbar 2 can fully cover the overlapping portion 10a, thereby making the force on the overlapping portion 10a more balanced. At the same time, it also avoids the first side 2a of the busbar 2 extending too far beyond the overlapping portion 10a, which would block the welding points at the edge of the corresponding battery cell 10 and thus affect the welding of the electrical component 3 and the electrode 11.

[0067] In some embodiments, such as Figure 5 and Figure 6As shown, the width D2 of the second side 2b extending beyond the overlapping portion 10a satisfies: 0mm ≤ D2 ≤ 7mm. For example, the width D2 can be set to 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, etc.

[0068] In this embodiment of the application, by setting the width D2 of the second side 2b of the busbar 2 extending beyond the overlapping portion 10a to be within the range of 0mm-7mm, it can be ensured that the second side 2b of the busbar 2 can fully cover the overlapping portion 10a, thereby making the force on the overlapping portion 10a more balanced. At the same time, it also avoids the second side 2b of the busbar 2 extending too far beyond the overlapping portion 10a, which would block the welding points of the corresponding battery cell 10 edge and thus affect the welding of the electrical component 3 and the electrode 11.

[0069] Optionally, such as Figure 2 and Figure 8 As shown, the insulating layer 4 extends continuously from one side of the battery cell 10 to the other side of the battery cell 10 along the second direction Y, and the second direction Y is perpendicular to the first direction X.

[0070] In this embodiment, by providing an insulating layer 4 that extends continuously from one side of the battery cell 10 to the other side along the second direction Y, that is, the insulating layer 4 is continuously provided between the busbar 2 and the overlapping portion 10a, the continuity of the insulating layer 4 between the busbar 2 and the overlapping portion 10a is ensured, so that the force at different positions between the busbar 2 and the overlapping portion 10a is more balanced, thereby avoiding the risk of cracking caused by uneven local force on the battery cell 10 at the overlapping portion 10a.

[0071] It is understood that the end of the insulating layer 4 can be flush with the edge of the battery cell 10 along the second direction Y, or the end of the insulating layer 4 can be set to have a certain distance from the edge of the battery cell 10 along the second direction Y. The length of the insulating layer 4 can be set according to the length of the busbar 2, and is not limited here.

[0072] Optionally, such as Figure 3 and Figure 9 As shown, busbar 2 (including Figure 3 21 and Figure 9 22) has a width of d1 in the first direction X, and the insulating layer 4 (including Figure 3 41 and Figure 9 42) The width in the first direction X is d2, which satisfies d2-d1≥0.5mm. For example, d2-d1 can be set to 0.5mm, 0.7mm, 0.8mm, 1mm, 1.5mm, 2mm, etc.

[0073] In this embodiment, by controlling the difference between the width d1 of the busbar 2 and the width d2 of the insulating layer 4, d2-d1 is greater than or equal to 0.5mm, on the one hand, a certain deviation is allowed when the busbar 2 and the insulating layer 4 are placed, which facilitates actual operation; on the other hand, it is convenient to make the insulating layer 4 extend beyond the busbar 2 on both sides along the first direction X, thereby ensuring the insulating and buffering effects of the insulating layer 4 between the busbar 2 and the overlapping part 10a.

[0074] Optionally, such as Figures 2 to 5 As shown, the plurality of solar cells 10 include a first solar cell 101 disposed along the first direction X closest to the edge of the photovoltaic module, and a second solar cell 102 adjacent to the first solar cell 101 along the first direction X. The first solar cell 101 and the second solar cell 102 are at least partially overlapped to form an overlap portion 10a. The busbar 2 includes a first busbar 21, and the insulating layer 4 includes a first insulating layer 41. The first busbar 21 is disposed between the first solar cell 101 and the second solar cell 102, and the first busbar 21 at least partially overlaps with the overlap portion 10a. The first busbar 21 is electrically connected to the first solar cell 101 through an electrical component 3, and the first insulating layer 41 is disposed on the side of the first busbar 21 facing the overlap portion 10a.

[0075] It is understandable that the first busbar 21 is a busbar 2 located at the edge of the photovoltaic module (i.e., an edge busbar). In traditional photovoltaic modules, a certain blank area is usually reserved at the edge of the photovoltaic module for the installation of the edge busbar. There is a certain gap between the edge busbar and the outermost solar cell 10, and the electrical components 3 on the solar cell 10 need to extend outward to the edge busbar to form an electrical connection. This means that the solar cell 10 cannot be placed where the edge busbar is located, thus the front area of ​​the photovoltaic module cannot be fully utilized.

[0076] In this application, by setting the first busbar 21 at the overlap of the first solar cell 101 and the second solar cell 102, the first solar cell 101 and the second solar cell 102 overlap to form an overlapping portion 10a, so that the first busbar 21 and the overlapping portion 10a at least partially overlap. In this way, by hiding the first busbar 21 on the back of the overlapping portion 10a, the front of the photovoltaic module can be covered with solar cells 10 as much as possible, thereby improving the efficiency of the photovoltaic module. Furthermore, electrodes 11 are arranged on the back of both the first solar cell 101 and the second solar cell 102. If the first busbar 21 is placed at other positions on the back of the first solar cell 101 or the second solar cell 102, mutual interference will occur between the first busbar 21 and the electrodes 11 on the solar cell 10. Moreover, since the surface of the solar cell 10 has an uneven structure after the electrodes 11 are placed on the back, if the first busbar 21 is placed on the electrodes 11, it will affect the flow and filling of the encapsulating film material into the gaps between the electrodes 11 during the hot pressing process, which can easily cause uneven local stress on the solar cell 10 and lead to cracking. Therefore, in this application, by making the first busbar 21 at least partially overlap with the overlapping portion 10a of the first solar cell 101 and the second solar cell 102, it is possible not only to improve the conversion efficiency of the photovoltaic module, but also to reduce the impact of the first busbar 21 on the structure of the electrodes 11 on the back of the solar cell 10.

[0077] Optionally, such as Figure 3 and Figure 4 As shown, electrical component 3 includes a first electrical component 31 and a second electrical component 32 with opposite conductivity types. The back surfaces of both the first battery cell 101 and the second battery cell 102 are provided with alternating first electrical components 31 and 32 arranged along a second direction Y, which intersects with the first direction X. The first electrical component 31 on the first battery cell 101 is electrically connected to the first busbar 21. The second electrical component 32 on the first battery cell 101 and the first electrical component 31 on the second battery cell 102 are interconnected to form an electrical connection structure 31a. At least a portion of the first insulating layer 41 is disposed between the electrical connection structure 31a and the first busbar 21. The second electrical component 32 on the second battery cell 102 is disconnected from the first busbar 21. This disconnection means that the second electrical component 32 on the second battery cell 102 is insulated from the first busbar 21.

[0078] Specifically, such as Figure 3As shown, both the first battery cell 101 and the second battery cell 102 are provided with alternating first electrical components 31 and second electrical components 32, and the arrangement of electrical components 3 on the first battery cell 101 and the second battery cell 102 can be set to be opposite, that is, along the second direction Y, the arrangement of electrical components 3 on the first battery cell 101 is: first electrical component 31-second electrical component 32-first electrical component 31-second electrical component 32... and so on; the arrangement of electrical components 3 on the second battery cell 102 is: second electrical component 32-first electrical component 31-second electrical component 32-first electrical component 31... and so on. In this way, along the first direction X, the first electrical component 31 on the first battery cell 101 corresponds to the second electrical component 32 on the second battery cell 102, and the second electrical component 32 on the first battery cell 101 corresponds to the first electrical component 31 on the second battery cell 102. The first busbar 21 only forms an electrical connection with the first electrical component 31 on the first battery cell 101.

[0079] In this embodiment, by electrically connecting the first electrical component 31 on the first battery cell 101 to the first busbar 21, disconnecting the second electrical component 32 on the second battery cell 102 from the first busbar 21, and connecting the second electrical component 32 on the first battery cell 101 to the first electrical component 31 on the second battery cell 102 to form an electrical connection structure 31a, and using the first insulating layer 41 to insulate the electrical connection structure 31a from the first busbar 21, the electrical connection between the first busbar 21 and the first battery cell 101, as well as the series connection between the first battery cell 101 and the second battery cell 102, is achieved. Thus, the first busbar 21 can be used to collect the current of the battery string 1.

[0080] It should be noted that, as Figure 1 As shown, a first busbar 21 can cover two adjacent battery strings 1 along the second direction Y, thereby forming an electrical connection between the first busbar 21 and the first battery cell 101 in both battery strings 1. Thus, the first busbar 21 can be used to realize the series connection between the two battery strings 1. The specific electrical connection structure 31a between the first busbar 21 and the first battery cell 101 in the two adjacent battery strings 1 can be flexibly set according to actual needs, and is not limited here.

[0081] In some embodiments, such as Figure 6 As shown, the second electrical component 32 on the second solar cell 102 can be extended to partially overlap with the insulating layer 4 in the thickness direction, so that the second electrical component 32 is as close as possible to the edge of the second solar cell 102, thereby improving the current collection capability at the edge of the second solar cell 102 and helping to improve the efficiency of the photovoltaic module. Here, the thickness direction refers to the thickness direction of the solar cell 10, which is perpendicular to the first direction X and the second direction Y.

[0082] Of course, such as Figure 5 As shown, along the first direction X, a certain gap can also be provided between the second electrical component 32 on the second battery cell 102 and the insulating layer 4 to reduce the lifting effect of the second electrical component 32 on the insulating layer 4, thereby reducing the problem of local cracking of the battery cell 10 at the overlapping part 10a during the hot pressing process.

[0083] In some embodiments, such as Figure 3 As shown, the first electrical component 31 on the first battery cell 101 can also be electrically connected to the side of the first busbar 21 away from the battery cell 10. This connection structure facilitates the welding operation of the first electrical component 31 and the first busbar 21, and also makes it easier to detect the welding effect through testing equipment.

[0084] In other embodiments, such as Figure 4 As shown, the first electrical component 31 on the first battery cell 101 can be electrically connected to the side of the first busbar 21 facing the battery cell 10. With this connection structure, since the end of the first electrical component 31 is not raised by the first busbar 21, the placement accuracy of the first electrical component 31 can be ensured, thereby improving the stability of the connection structure between the first electrical component 31 and the first busbar 21 in the component manufacturing process.

[0085] It should be noted that during the photovoltaic module manufacturing process, the first electrical component 31 and the first busbar 21 can be placed separately and then fixed by welding; alternatively, the first electrical component 31 and the first busbar 21 can be welded together to form a combined structure, and then the combined structure can be laid on the corresponding solar cell 10. The specific operating process can be flexibly set according to actual needs and is not limited here.

[0086] Optionally, such as Figure 7 As shown, along the first direction X, the first insulating layer 41 has a third side 41a facing the first battery cell 101 and a fourth side 41b facing the second battery cell 102. The third side 41a extends beyond the first busbar 21 by a width of D3, and the fourth side 41b extends beyond the first busbar 21 by a width of D4, satisfying: D3 > D4.

[0087] In this embodiment, by setting the width of the first insulating layer 41 extending beyond the first busbar 21 on the side facing the first battery cell 101 to be greater than the width extending beyond the first busbar 21 on the side facing the second battery cell 102, the portion of the third side 41a of the first insulating layer 41 extending beyond the first busbar 21 during hot pressing can fill the gap between the first electrical component 31 and the first battery cell 101, thereby reducing the stress concentration in the overlapping portion 10a caused by the end deformation of the first electrical component 31 under pressure, and thus reducing the risk of cracking caused by uneven stress on the battery cell 10 at the overlapping portion 10a.

[0088] It is understandable that the first busbar 21 is only electrically connected to the first electrical component 31 on the first solar cell 101. When the first electrical component 31 is laid, the end of the first electrical component 31 will be raised by the overlapping part 10a and the insulating layer 4, so that there is a gap between the part of the first electrical component 31 near the end and the solar cell 10. During the hot pressing process of the photovoltaic module, the suspended part of the first electrical component 31 will be deformed into the gap, so that the end of the first electrical component 31 will generate a tensile force along the thickness direction on the busbar 2 and the overlapping part 10a. However, there is no tensile force at other positions of the overlapping part 10a. This can easily cause the solar cell 10 at the overlapping part 10a to crack due to uneven local stress.

[0089] Therefore, in this embodiment, by setting the width of the first insulating layer 41 extending beyond the first busbar 21 on the side facing the first battery cell 101 to be greater than the width extending beyond the first busbar 21 on the side facing the second battery cell 102, that is, by extending the third side 41a of the first insulating layer 41 into the gap between the first electrical component 31 and the battery cell 10, the material of the first insulating layer 41 softens under heat during the hot pressing process and fills the gap between the first electrical component 31 and the first battery cell 101, thereby eliminating the local stress concentration caused by the pressure deformation of the first electrical component 31 on the overlapping portion 10a, thereby reducing the cracking problem caused by uneven stress on the battery cell 10 at the overlapping portion 10a, and improving the quality stability of the photovoltaic module.

[0090] Optionally, such as Figures 8 to 10 As shown, the plurality of solar cells 10 include a third solar cell 103 and a fourth solar cell 104 located in the middle of the photovoltaic module. The third solar cell 103 and the fourth solar cell 104 are arranged adjacent to each other along the first direction X and at least partially overlap to form an overlapping portion 10a. The busbar 2 includes a second busbar 22, and the insulating layer 4 includes a second insulating layer 42. The second busbar 22 is located between the third solar cell 103 and the fourth solar cell 104. The second busbar 22 at least partially overlaps with the overlapping portion 10a. The second busbar 22 is electrically connected to the third solar cell 103 and the fourth solar cell 104 respectively through an electrical component 3. The second insulating layer 42 is located on the side of the second busbar 22 facing the overlapping portion 10a.

[0091] Understandably, the second busbar 22 is a busbar 2 located in the middle of the photovoltaic module (i.e., the intermediate busbar). In traditional photovoltaic modules, a certain blank area is usually reserved between two adjacent cell strings 1 in the middle of the photovoltaic module for the intermediate busbar. There is a certain gap between the intermediate busbar and the cell strings 1 on both sides. The electrical components 3 on the cells 10 on both sides need to extend to the intermediate busbar to form an electrical connection. This means that the cell 10 cannot be placed in the position where the intermediate busbar is located, thus the front area of ​​the photovoltaic module cannot be fully utilized.

[0092] In this application, by placing the second busbar 22 at the overlap of the third cell 103 and the fourth cell 104, the third cell 103 and the fourth cell 104 overlap to form an overlapping portion 10a, so that the second busbar 22 at least partially overlaps with the overlapping portion 10a. In this way, by hiding the second busbar 22 on the back of the overlapping portion 10a, there is no need to reserve a blank area in the middle of the photovoltaic module, so that the front of the photovoltaic module can be covered with cells 10 as much as possible, thereby improving the efficiency of the photovoltaic module. Furthermore, electrodes 11 are arranged on the back of both the third solar cell 103 and the fourth solar cell 104. If the second busbar 22 is offset to another position on the back of the third solar cell 103 or the fourth solar cell 104, the second busbar 22 will interfere with the electrodes 11 on the solar cell 10. Moreover, since the surface of the back of the solar cell 10 has an uneven structure after the electrodes 11 are set, if the second busbar 22 is set on the electrodes 11, it will affect the flow and filling of the encapsulating film material between the electrodes 11 during the hot pressing process, which can easily cause uneven local stress and cracking problems. Therefore, in this application, by setting the second busbar 22 to at least partially overlap the overlapping portion 10a of the third solar cell 103 and the fourth solar cell 104, it is possible not only to improve the conversion efficiency of the photovoltaic module, but also to reduce the impact of setting the second busbar 22 on the structure of the electrodes 11 on the back of the solar cell 10.

[0093] Optionally, such as Figure 9 and Figure 10 As shown, electrical component 3 includes a third electrical component 33 and a fourth electrical component 34 with opposite conductivity types. The back surfaces of both the third battery cell 103 and the fourth battery cell 104 are provided with third electrical components 33 and fourth electrical components 34 arranged alternately along a second direction Y, which intersects with the first direction X. The third electrical component 33 on the third battery cell 103 and the third electrical component 33 on the fourth battery cell 104 are electrically connected to the second busbar 22, while the fourth electrical component 34 on the third battery cell 103 and the fourth electrical component 34 on the fourth battery cell 104 are disconnected from the second busbar 22. This disconnection refers to the insulation isolation between the fourth electrical component 34 and the second busbar 22.

[0094] Specifically, both the third battery cell 103 and the fourth battery cell 104 are provided with alternating third electrical components 33 and fourth electrical components 34, and the arrangement structure of the electrical components on the third battery cell 103 and the fourth battery cell 104 can be set to be the same. That is, along the second direction Y, the arrangement structure of the electrical components on the third battery cell 103 is: third electrical component 33-fourth electrical component 34-third electrical component 33-fourth electrical component 34... and so on; the arrangement structure of the electrical components on the fourth battery cell 104 is also: third electrical component 33-fourth electrical component 34-third electrical component 33-fourth electrical component 34... and so on. Thus, along the first direction X, the third electrical component 33 on the third battery cell 103 corresponds to the third electrical component 33 on the fourth battery cell 104, and the fourth electrical component 34 on the third battery cell 103 corresponds to the fourth electrical component 34 on the fourth battery cell 104. The second busbar 22 is electrically connected to the third electrical component 33 on the third battery cell 103 and the third electrical component 33 on the fourth battery cell 104, respectively.

[0095] In this embodiment, by electrically connecting the third electrical component 33 on the third battery cell 103 and the third electrical component 33 on the fourth battery cell 104 to the second busbar 22, and disconnecting the fourth electrical component 34 on the third battery cell 103 and the fourth electrical component 34 on the fourth battery cell 104 from the first busbar 21, the second busbar 22 can be used to realize the parallel connection between two adjacent battery strings 1 along the first direction X, so that the current of the battery strings 1 on both sides can be collected and transmitted by the second busbar 22.

[0096] In some embodiments, such as Figure 9 As shown, the third electrical component 33 is electrically connected to the side of the second busbar 22 away from the battery cell 10. This connection structure facilitates the welding operation between the third electrical component 33 and the second busbar 22, and also makes it easier to inspect the welding effect through testing equipment.

[0097] In other embodiments, such as Figure 10 As shown, the third electrical component 33 is electrically connected to the side of the second busbar 22 facing the battery cell 10. With this connection structure, since the end of the third electrical component 33 is not raised by the second busbar 22, the placement accuracy of the third electrical component 33 can be ensured, and the twisting or offset of the third electrical component 33 can be avoided, thereby improving the stability of the electrical component 3 in the module manufacturing process.

[0098] It should be noted that the third electrical component 33 and the second busbar 22 can be placed separately and then fixed by welding; alternatively, the third electrical component 33 and the second busbar 22 can be welded together to form a combined structure, and then the combined structure can be laid on the corresponding battery cell 10. The specific operating process can be flexibly set according to actual needs and is not limited here.

[0099] In some embodiments, such as Figure 12 As shown, a certain gap can be provided between the fourth electrical component 34 on the third battery cell 103 and the fourth electrical component 34 on the fourth battery cell 104 and the second insulating layer 42; or, as shown... Figure 13 As shown, the fourth electrical component 34 on the third battery cell 103 and the fourth electrical component 34 on the fourth battery cell 104 can also be extended to the side of the second insulating layer 42 facing the overlapping portion 10a, so that the fourth electrical component 34 and the second insulating layer 42 partially overlap. The arrangement structure of the fourth electrical component 34 and the second insulating layer 42 can be flexibly arranged according to actual needs, and is not limited here.

[0100] Optionally, such as Figure 14 and Figure 15 As shown, the back of the battery cell 10 is provided with a plurality of electrodes 11 arranged at intervals in a first direction X; the vertical distance between the electrode 11 closest to the edge of the battery cell 10 along the first direction X and the edge of the battery cell 10 is y; the back of the battery cell 10 is also provided with a plurality of electrical connection portions 12, each electrical connection portion 12 being electrically connected to at least one electrode 11, the vertical distance between the electrical connection portion 12 closest to the edge of the battery cell 10 along the first direction X and the edge of the battery cell 10 is x; the width of the overlapping portion 10a in the first direction X is c, and the width of the busbar 2 in the first direction X is d1, satisfying: 2y+c≤d1≤2x-c-2y.

[0101] In this embodiment, by establishing the relationship between the width d1, the width c, the distance x, and the distance y, the width of the busbar 2 can be reasonably set based on the width of the overlapping portion 10a and the positions of the electrodes 11 and electrical connection portions 12 on the battery cell 10. On the one hand, this ensures that the busbar 2 has a certain width, which can form a stable connection with the electrical component 3, reducing the risk of tensile failure, and also ensuring the current-gathering capacity of the busbar 2. On the other hand, it ensures that there is a certain overlap area between the busbar 2 and the battery cell 10, preventing the busbar 2 from shifting to the back of the battery cell 10 on one side, thus avoiding obstruction of the electrical connection portions 12 at the edge of the battery cell 10. At the same time, it can also reduce the problem of cell cracking caused by local stress concentration during hot pressing. Furthermore, during the soldering process of the electrical component 3 at the electrical connection portion 12, solder dross will be splashed. By maintaining a certain distance between the busbar 2 and the electrical connection portion 12 at the edge of the battery cell 10, the solder dross generated during the soldering of the dissimilar electrical component 3 will not come into contact with the busbar 2 and cause a short circuit. In addition, by maintaining a certain distance between the busbar 2 and the electrical connection portion 12 at the edge of the battery cell 10, the busbar 2 can avoid short circuit with the dissimilar electrical component 3 if it is misaligned during the placement of the busbar 2.

[0102] In some embodiments, the distance y is in the range of 0.05mm-1mm, for example, it can be set to 0.05mm, 0.1mm, 0.2mm, 0.5mm, 0.7mm, 1mm, etc.

[0103] In other embodiments, the photovoltaic module includes a front glass, an encapsulation film, and a backsheet stacked together. A battery layer is embedded in the encapsulation film and is formed by arranging multiple battery cells 10. The formula c = (b - 2z - na) / (n - 1), where b is the length of the front glass in the photovoltaic module along the first direction X, z is the designed safety distance between the battery layer and the edge of the front glass along the first direction X, n is the number of battery cells 10 arranged from one end of the photovoltaic module to the other along the first direction X, and a is the length of each battery cell 10 along the first direction X. For example, the designed safety distance z ≥ 12.9 mm; for example, z can be set to 12.9 mm, 13 mm, 14 mm, 15 mm, etc. The number of battery cells 10 n ≥ 2; for example, n can be set to 18, 20, 22, 24, etc.

[0104] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0105] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized by, include: Multiple battery strings and busbars; The battery string includes a plurality of battery cells arranged along a first direction, and two adjacent battery cells at least partially overlap to form an overlapping portion. The busbar is disposed on the back side of the battery string, and the busbar at least partially overlaps the overlapping portion. The busbar is electrically connected to the battery cells through an electrical component, and the side of the busbar facing the overlapping portion is provided with an insulating layer.

2. The photovoltaic module of claim 1, wherein, The busbar extends beyond the overlapping portion on both sides along the first direction; and / or the insulating layer extends beyond the busbar on both sides along the first direction.

3. The photovoltaic module of claim 2, wherein, The busbar has a first side and a second side disposed opposite to each other along the first direction. The width of the first side extending beyond the overlapping portion is D1, and the width of the second side extending beyond the overlapping portion is D2, satisfying: 0≤|D1-D2|≤7mm.

4. The photovoltaic module of claim 3, wherein, The width D1 of the first side extending beyond the overlapping portion satisfies: 0mm ≤ D1 ≤ 7mm; And / or, the width D2 of the second side extending beyond the overlapping portion satisfies: 0mm ≤ D2 ≤ 7mm.

5. The photovoltaic module of claim 1, wherein, The insulating layer extends continuously from one side of the battery cell to the other side along a second direction, which is perpendicular to the first direction.

6. The photovoltaic module of claim 1, wherein, The width of the busbar in the first direction is d1, and the width of the insulating layer in the first direction is d2, satisfying that d2-d1≥0.5mm.

7. The photovoltaic module according to any of claims 1 to 6, characterized in that The plurality of solar cells include a first solar cell disposed along the first direction closest to the edge of the photovoltaic module, and a second solar cell adjacent to the first solar cell along the first direction, wherein the first solar cell and the second solar cell at least partially overlap to form the overlapping portion; The busbar includes a first busbar, the insulating layer includes a first insulating layer, the first busbar is disposed between the first battery cell and the second battery cell, and the first busbar at least partially overlaps with the overlapping portion, the first busbar is electrically connected to the first battery cell through the electrical component, and the first insulating layer is disposed on the side of the first busbar facing the overlapping portion.

8. The photovoltaic module of claim 7, wherein, The electrical components include a first electrical component and a second electrical component with opposite conductivity types. The back sides of both the first and second battery cells are provided with the first electrical component and the second electrical component arranged alternately along a second direction, which intersects with the first direction. The first electrical component on the first battery cell is electrically connected to the first busbar, and the second electrical component on the first battery cell is interconnected with the first electrical component on the second battery cell to form an electrical connection structure, and at least part of the first insulating layer is disposed between the electrical connection structure and the first busbar; the second electrical component on the second battery cell is disconnected from the first busbar.

9. The photovoltaic module of claim 8, wherein, The first electrical component on the first battery cell is electrically connected to the side of the first busbar facing the battery cell, or the first electrical component on the first battery cell is electrically connected to the side of the first busbar away from the battery cell.

10. The photovoltaic module of claim 7, wherein, Along the first direction, the first insulating layer has a third side facing the first battery cell and a fourth side facing the second battery cell. The third side extends beyond the width of the first busbar by a width D3, and the fourth side extends beyond the width of the first busbar by a width D4, satisfying that D3 > D4.

11. The photovoltaic module according to any of claims 1-6, wherein, The plurality of solar cells include a third solar cell and a fourth solar cell located at the middle position of the photovoltaic module, wherein the third solar cell and the fourth solar cell are arranged adjacent to each other along the first direction and at least partially overlap to form the overlapping portion; The busbar includes a second busbar, the insulating layer includes a second insulating layer, the second busbar is disposed between the third battery cell and the fourth battery cell, the second busbar at least partially overlaps with the overlapping portion, the second busbar is electrically connected to the third battery cell and the fourth battery cell respectively through the electrical components, and the second insulating layer is disposed on the side of the second busbar facing the overlapping portion.

12. The photovoltaic module of claim 11, wherein, The electrical components include a third electrical component and a fourth electrical component with opposite conductivity types. The back sides of the third battery cell and the fourth battery cell are provided with the third electrical component and the fourth electrical component arranged alternately along a second direction, which intersects with the first direction. The third electrical component on the third battery cell and the third electrical component on the fourth battery cell are respectively electrically connected to the second busbar, and the fourth electrical component on the third battery cell and the fourth electrical component on the fourth battery cell are respectively disconnected from the second busbar.

13. The photovoltaic module of claim 12, wherein, The third electrical component is electrically connected to the side of the second busbar facing the battery cell, or the third electrical component is electrically connected to the side of the second busbar away from the battery cell.

14. The photovoltaic module according to claim 1, characterized in that, The back of the battery cell is provided with a plurality of electrodes arranged at intervals in the first direction; the vertical distance between the electrode closest to the edge of the battery cell along the first direction and the edge of the battery cell is y; the back of the battery cell is also provided with a plurality of electrical connection portions, each of the electrical connection portions being electrically connected to at least one of the electrodes, the vertical distance between the electrical connection portion closest to the edge of the battery cell along the first direction and the edge of the battery cell is x; the width of the overlapping portion in the first direction is c, and the width of the busbar in the first direction is d1, satisfying: 2y+c≤d1≤2x-c-2y.

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