Photovoltaic module

Abstract

The invention discloses a photovoltaic module, and belongs to the technical field of photovoltaic modules. The photovoltaic module comprises a battery piece, the battery piece is provided with a first surface and a second surface which are oppositely arranged, the first surface of the battery piece is provided with a plurality of fine grids which extend in the first direction and are arranged at intervals in the second direction, and the second direction intersects with the first direction; the first bonding pad is arranged on the first surface of the battery piece and is electrically connected with at least part of the fine grid; the first adhesive point is arranged on the first surface of the battery piece, and the first adhesive point is arranged on one side of the first bonding pad along the first direction; the first electric connecting piece is arranged on the first surface of the battery piece, the first electric connecting piece extends in the second direction, the first electric connecting piece is electrically connected with the first bonding pad, and the first electric connecting piece is in lap joint with the first glue point.

Description

Technical Field

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

[0002] A photovoltaic module includes at least two solar cells and electrical connectors. The at least two solar cells are arranged at intervals, and the electrical connectors are disposed on the surface of the solar cells and connect the at least two solar cells to form a cell string. The electrical connectors collect the charge carriers generated by the solar cells and transfer the collected charge carriers to an external circuit.

[0003] In related technologies, a first adhesive dot is placed between the surface of the electrical connector and the surface of the solar cell, and the electrical connector is fixed to the surface of the solar cell through the first adhesive dot. A photovoltaic module is then laminated to make the electrical connector and the solar cell conductive, thereby allowing the collection of charge carriers generated by the solar cell through the electrical connector.

[0004] However, in related technologies, the projection of the first adhesive dot onto the plane of the solar cell lies within the projection of the electrical connector onto the plane of the solar cell, and the projection of the first adhesive dot onto the plane of the solar cell is located at the middle position of the projection of the electrical connector onto the plane of the solar cell. With this configuration, during the lamination process of the photovoltaic module, the first adhesive dot can easily overflow between the fine grid of the solar cell and the electrical connector, causing the electrical connector and the fine grid on the surface of the solar cell to lose conductivity, thus affecting the photoelectric conversion efficiency of the photovoltaic module. Summary of the Invention

[0005] This application discloses a photovoltaic module to solve, or at least partially solve, the problem in the prior art where the first adhesive dot easily overflows between the grid and electrical connector of the solar cell, causing the electrical connector and the grid on the surface of the solar cell to lose conductivity, thus affecting the photoelectric conversion efficiency of the photovoltaic module.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] In a first aspect, this application discloses a photovoltaic module, which includes a solar cell having a first surface and a second surface disposed opposite to each other. The first surface of the solar cell is provided with a plurality of fine grids extending along a first direction and spaced apart along a second direction, the second direction intersecting the first direction; a first pad disposed on the first surface of the solar cell and electrically connected to at least a portion of the fine grids; a first adhesive dot disposed on the first surface of the solar cell, along the first direction, the first adhesive dot being disposed on one side of the first pad; and a first electrical connector disposed on the first surface of the solar cell, the first electrical connector extending along the second direction, the first electrical connector being electrically connected to the first pad, and the first electrical connector overlapping the first adhesive dot.

[0008] The photovoltaic module disclosed in this application has fine grids extending along a first direction and spaced apart along a second direction on the first surface of the solar cell to collect charge carriers generated by the solar cell. The first surface of the solar cell also has a first pad electrically connected to at least the fine grids to collect a portion of the charge carriers collected by the fine grids. A first adhesive dot is disposed on the first surface of the solar cell, along the first direction, and on one side of the first pad. A first electrical connector is disposed on the first surface of the solar cell, extending along the second direction and electrically connected to the first pad to collect the charge carriers collected by the first pad and transmit the collected charge carriers to an external circuit.

[0009] Furthermore, in this application, the first electrical connector overlaps with the first adhesive dot, that is, the first adhesive dot is at least partially located between the solar cell and the first electrical connector, so as to fix the first electrical connector to the surface of the solar cell through the first adhesive dot. During the manufacturing process of the photovoltaic module, the first electrical connector is prevented from shifting, which would cause the first electrical connector to conduct with the non-standard grid line or other electrical connectors, resulting in a partial short circuit in the photovoltaic module and affecting the photoelectric conversion efficiency of the photovoltaic module.

[0010] Furthermore, the first adhesive dot is positioned on one side of the first pad along the first direction to ensure the photoelectric conversion efficiency of the photovoltaic module. This prevents the first adhesive dot from overflowing between the grid and the first electrical connector during the photovoltaic module manufacturing process, or from overflowing between the first pad and the first electrical connector, affecting the reliability of the direct electrical connection between the grid and the first electrical connector, or the reliability of the electrical connection between the first pad and the first electrical connector, which could lead to the first electrical connector being unable to fully collect the charge carriers collected by the grid, thus affecting the photoelectric conversion efficiency of the photovoltaic module. Attached Figure Description

[0011] Figure 1 This diagram illustrates the structure of the photovoltaic module described in the embodiments of this application. Figure 1 ;

[0012] Figure 2 This diagram illustrates the structure of the photovoltaic module described in the embodiments of this application. Figure 2 ;

[0013] Figure 3 This diagram illustrates the structure of the photovoltaic module described in the embodiments of this application. Figure 3 ;

[0014] Figure 4 This diagram illustrates the structure of the photovoltaic module described in the embodiments of this application. Figure 4 ;

[0015] Figure 5This diagram illustrates the structure of the photovoltaic module described in the embodiments of this application. Figure 5 ;

[0016] Figure 6 This diagram illustrates the structure of the photovoltaic module described in the embodiments of this application. Figure 6 ;

[0017] Figure 7 This diagram illustrates the structure of the photovoltaic module described in the embodiments of this application. Figure 7 ;

[0018] Figure 8 This is a partial cross-sectional view of the photovoltaic module described in the embodiments of this application;

[0019] Figure 9 This diagram illustrates the structure of the first pad in an embodiment of this application. Figure 1 ;

[0020] Figure 10 This diagram illustrates the structure of the first pad in an embodiment of this application. Figure 2 ;

[0021] Figure 11 This is a schematic diagram showing the structure of the adhesive dots described in the embodiments of this application.

[0022] Figure label:

[0023] 10: Solar cell; 11: First grid; 12: Second grid;

[0024] 20: First pad; 21: First pad body; 22: End connection portion;

[0025] 30: First electrical connection;

[0026] 40: First glue point;

[0027] 50: First insulating block;

[0028] 60: First bonding layer;

[0029] 70: Second glue point;

[0030] X: First direction; Y: Second direction. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of the present invention.

[0032] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0033] This application discloses a photovoltaic module, which includes a solar cell 10, the solar cell 10 having a first surface and a second surface disposed opposite to each other, the first surface of the solar cell 10 having fine grids extending along a first direction X and spaced apart along a second direction Y, the second direction Y intersecting the first direction X; a first pad 20, the first pad 20 being disposed on the first surface of the solar cell 10 and electrically connected to at least a portion of the fine grids; a first adhesive dot 40, the first adhesive dot 40 being disposed on the first surface of the solar cell 10, along the first direction X, the first adhesive dot 40 being disposed on one side of the first pad 20; and a first electrical connector 30, the first electrical connector 30 being disposed on the first surface of the solar cell 10, the first electrical connector 30 extending along the second direction Y, the first electrical connector 30 being electrically connected to the first pad 20, and the first electrical connector 30 overlapping the first adhesive dot 40.

[0034] It should be noted that the photovoltaic modules disclosed in this application can be back-contact photovoltaic modules, which have advantages such as high photoelectric conversion efficiency and more aesthetically pleasing appearance. The photovoltaic modules disclosed in this application can also be bifacial photovoltaic modules, such as TOPCon photovoltaic modules. In this application, no excessive restrictions are placed on the specific type of photovoltaic module.

[0035] The photovoltaic module disclosed in this application includes a solar cell 10, which is the core component of the photovoltaic module and can convert solar energy into electrical energy. Along the thickness direction of the photovoltaic module, the solar cell 10 has a first surface and a second surface disposed opposite to each other. When the first surface is the back surface of the solar cell 10, i.e., the backlight surface, the second surface is the front surface of the solar cell 10, i.e., the light-receiving surface. When the first surface is the front surface of the solar cell 10, the second surface is the back surface of the solar cell 10.

[0036] The following description will use the first surface as the back side of the solar cell 10, i.e. the backlight surface, and the second surface as the front side of the solar cell 10, i.e. the light-receiving surface, as an example to illustrate the photovoltaic module disclosed in this application.

[0037] On the plane containing the solar cell 10, the photovoltaic module has intersecting first direction X and second direction Y. For example, when the solar cell 10 is a rectangular cell, the first direction X can be the length direction of the solar cell 10, and the second direction Y can be the width direction of the solar cell 10. Alternatively, when the solar cell 10 is a rectangular cell, the first direction X can be the width direction of the solar cell 10, and the second direction Y can be the length direction of the solar cell 10.

[0038] When the photovoltaic module is a back-contact photovoltaic module, the first surface of the cell 10 is provided with a first fine grid 11 and a second fine grid 12 extending along a first direction X and arranged alternately along a second direction Y, so as to collect the charge carriers generated by the cell 10 through the first fine grid 11 and the second fine grid 12. It should be noted that the first fine grid 11 and the second fine grid 12 have opposite conductivity types. When the first electrical connector 30 needs to be electrically connected to the first fine grid 11, a first insulating block 50 is provided at the intersection of the first electrical connector 30 and the second fine grid 12, see [reference]. Figure 1 and Figure 2 .

[0039] When the photovoltaic module is a bifacial photovoltaic module, the first surface of the solar cell 10 is provided with a first fine grid 11 extending along a first direction X and spaced apart along a second direction Y, and the second surface of the solar cell 10 is provided with a second fine grid 12 extending along the first direction X and spaced apart along the second direction Y, so as to collect the charge carriers generated by the solar cell 10 through the first fine grid 11 and the second fine grid 12. It should be noted that the first fine grid 11 and the second fine grid 12 have opposite conductivity types.

[0040] The electrode pattern on the solar cell 10 can be either a pattern structure with a main grid or a pattern structure without a main grid. The electrode pattern with a main grid includes a main grid extending along the second direction Y, connecting to a fine grid of one polarity (e.g., a first fine grid 11 or a second fine grid 12). First pads 20 are connected through the main grid, and the number of first pads 20 is relatively small, typically between 5 and 12. The electrode pattern without a main grid has an end line extending along the second direction Y at its edge (see...). Figure 6 The end line can be connected to the first pad 20 closest to the edge of the cell 10. In the middle part outside the end line, there is no main grid to connect the same type of fine grid. Instead, they are connected through the first pad 20. The number of the first pads 20 is usually large, for example, generally greater than or equal to 30.

[0041] The photovoltaic module disclosed in this application further includes a first pad 20 and a first electrical connector 30. The first pad 20 is disposed on the first surface of the cell 10 and is electrically connected to at least one first fine grid 11. The first electrical connector 30 is disposed on the first surface of the cell 10, extends along the second direction Y, and is electrically connected to the first pad 20. The first electrical connector 30 is connected to at least one first fine grid 11 through the first pad 20, so that the charge carriers collected by the first fine grid 11 can be transferred through the first pad 20 to the first electrical connector 30, and the collected charge carriers can be transferred to an external circuit through the first electrical connector 30.

[0042] It should be noted that when the photovoltaic module is a back-contact photovoltaic module, the first electrical connector 30 is insulated from the second fine grid 12 to prevent the first electrical connector 30 from conducting with the second fine grid 12, which could lead to a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module. For example, a first insulating block 50 can be provided between the first electrical connector 30 and the second fine grid 12 to insulate and isolate the first electrical connector 30 and the second fine grid 12, thus preventing them from conducting. Alternatively, the second fine grid 12 can be provided with a plurality of sub-fine grids extending along the first direction X and spaced apart along the first direction X, with a gap between adjacent sub-fine grids. The first electrical connector 30 passes through the gap between adjacent sub-fine grids, thereby preventing the first electrical connector 30 from contacting and conducting with the second fine grid 12.

[0043] like Figure 1 As shown, the photovoltaic module disclosed in this application embodiment further includes a first adhesive dot 40, which is disposed on the first surface of the cell 10. Along the first direction X, the first adhesive dot 40 is located on one side of the first pad 20, and the first electrical connector 30 overlaps the first adhesive dot 40. That is, the first adhesive dot 40 is at least partially located between the first surface of the cell 10 and the first electrical connector 30. During the fabrication of the photovoltaic module, the first electrical connector 30 is fixed to the first surface of the cell 10 by the first adhesive dot 40 to prevent the first electrical connector 30 from shifting. The first electrical connector 30 is simultaneously connected to both the first pad 20 and the first adhesive dot 40. The first electrical connector 30 is electrically connected to the first pad 20 through an bonding layer, and is directly physically connected to the first adhesive dot 40.

[0044] It should be noted that in this embodiment, the first adhesive dot 40 is located on one side of the first pad 20 along the first direction X. The term "one side" here does not only refer to the side directly opposite along the first direction X, but also includes other sides. Figure 1 and Figure 2As shown, the positional relationship between the first adhesive dot 40 and its adjacent first pad 20 also refers to the situation where the first adhesive dot 40 is located on one side of the adjacent first pad 20 but is slightly misaligned along the second direction Y. For example, along the first direction X, the first pad 20 has a first side and a second side that are oppositely disposed. The first adhesive dot 40 can be located on the first pad 20 away from the second side, or it can be located on the first pad 20 away from the first side. Of course, there can also be two first adhesive dots 40: one located on the first pad 20 away from the first side, and the other located on the first pad 20 away from the second side.

[0045] In this embodiment, the first adhesive dot 40 is disposed on one side of the first pad 20 along the first direction X to ensure the photoelectric conversion efficiency of the photovoltaic module. This prevents the first adhesive dot 40 from overflowing between the first fine grid 11 and the first electrical connector 30 during the photovoltaic module manufacturing process, or from overflowing between the first pad 20 and the first electrical connector 30, affecting the reliability of the direct electrical connection between the first fine grid 11 and the first electrical connector 30, or affecting the reliability of the electrical connection between the first pad 20 and the first electrical connector 30. This would prevent the first electrical connector 30 from completely collecting the charge carriers collected by the first fine grid 11, thus affecting the photoelectric conversion efficiency of the photovoltaic module.

[0046] In some embodiments, the photovoltaic module disclosed in this application includes a solar cell 10, the solar cell 10 having a first surface and a second surface disposed opposite to each other, the first surface of the solar cell 10 being provided with a plurality of fine grids extending along a first direction X and spaced apart along a second direction Y, the second direction Y intersecting the first direction X; a first adhesive dot 40 disposed on the first surface of the solar cell 10; and a first electrical connector 30 disposed on the first surface of the solar cell 10, the first electrical connector 30 extending along the second direction Y, the first electrical connector 30 being electrically connected to a portion of the fine grids, and the first electrical connector 30 overlapping the first adhesive dot 40.

[0047] Each first electrical connector 30 corresponds to two rows of first adhesive dots 40. In the first direction X, one row of first adhesive dots 40 is located between the first surface of the solar cell 10 and one edge of the first electrical connector 30, and the other row is located between the first surface of the solar cell 10 and the other edge of the first electrical connector 30. The two rows of first adhesive dots 40 are staggered along the second direction Y. It should be noted that during the processing of the photovoltaic module, the first adhesive dots 40 can be first set on the first surface of the solar cell 10, and then the first electrical connector 30 can be overlapped onto the first pad 20 and at least a portion of the first adhesive dots 40. That is, during the processing of the photovoltaic module, the first adhesive dots 40 are set first, and then the first electrical connector 30 is set. Alternatively, during the processing of the photovoltaic module, the first electrical connector 30 can be first set on the first surface of the solar cell 10, and then the first adhesive dots 40 can be set between the edge of the first electrical connector 30 and the first surface of the solar cell 10. That is, during the processing of the photovoltaic module, the first electrical connector 30 is set first, and then the first adhesive dots 40 are set.

[0048] In some embodiments, such as Figure 1 As shown, the first electrical connector 30 has a first projection on the plane where the battery cell 10 is located, and the first pad 20 has a second projection on the plane where the battery cell 10 is located, with the second projection falling into the first projection.

[0049] like Figure 1 As shown, along the thickness direction of the photovoltaic module, the first electrical connector 30 has a first projection on the plane where the cell 10 is located, and the first pad 20 has a second projection on the plane where the cell 10 is located, with the second projection falling within the first projection. That is, the first pad 20 is located between the first surface of the cell 10 and the first electrical connector 30, so that the first pad 20 can conduct electricity between the first fine grid 11 on the first surface of the cell 10 and the first electrical connector 30, and the first electrical connector 30 can collect the charge carriers collected by the first fine grid 11 and transmit the collected charge carriers to the external circuit.

[0050] Furthermore, the above configuration can also extend the edge of the first electrical connector 30 from the first pad 20 on the surface, and make it conductive with the second grid 12 or other dissimilar electrical connectors, causing a partial short circuit in the photovoltaic module and affecting the photoelectric conversion efficiency of the photovoltaic module.

[0051] In some embodiments, such as Figure 1 As shown, along the first direction X, the size of the first electrical connector 30 is L1, and the size of the first pad 20 is L2, satisfying L1 > L2.

[0052] like Figure 1As shown, the width of the first electrical connector 30 along the first direction X is L1, and the width of the first pad 20 along the first direction X is L2, where L1 > L2. That is, the width L1 of the first electrical connector 30 along the first direction X is greater than the length L2 of the first pad 20 along the first direction X.

[0053] In this embodiment, by setting the width L1 of the first electrical connector 30 along the first direction X to be greater than the length L2 of the first pad 20 along the first direction X, the first electrical connector 30 can completely cover the first pad 20, thus preventing the first pad 20 from extending beyond the side of the first electrical connector 30 along the first direction X, which would cause the first pad 20 to be connected to the heterogeneous grid line or heterogeneous electrical connector, affecting the photoelectric conversion efficiency of the photovoltaic module.

[0054] Furthermore, the first pad 20 is typically a tin pad, silver pad, etc., and the material cost of the first pad 20 is relatively high. The above configuration can also reduce the area of ​​the first pad 20, reduce the amount of material used in the first pad 20, thereby reducing the manufacturing cost of photovoltaic modules and enhancing the market competitiveness of photovoltaic modules.

[0055] In some embodiments, the following conditions are met: 1.2mm ≤ L1 ≤ 5mm; and / or, 1mm ≤ L2 ≤ 3mm.

[0056] In this embodiment of the application, the width L1 of the first electrical connector 30 along the first direction X is set to be greater than or equal to 1.2 mm and less than or equal to 5 mm. For example, the width L1 of the first electrical connector 30 along the first direction X can be set to 1.2 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0057] In this embodiment, the width L1 of the first electrical connector 30 along the first direction X is set to be greater than or equal to 1.2 mm and less than or equal to 5 mm. This ensures the carrier collection efficiency of the first electrical connector 30 and the photoelectric conversion efficiency of the photovoltaic module. Furthermore, the above setting also ensures the reliability of the welding between the first electrical connector 30 and the first pad 20, thereby further ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0058] In a preferred embodiment of this application, the width L1 of the first electrical connector 30 along the first direction X is set to be greater than or equal to 1.8 mm and less than or equal to 2.5 mm. That is, 1.8 mm ≤ L1 ≤ 2.5 mm. This further ensures the carrier collection efficiency of the first electrical connector 30 and the photoelectric conversion efficiency of the photovoltaic module. Furthermore, the above setting can also further ensure the reliability of the welding between the first electrical connector 30 and the first pad 20, thereby further ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0059] In this embodiment, the length L2 of the first pad 20 along the first direction X is set to be greater than or equal to 1 mm and less than or equal to 3 mm. For example, the length L2 of the first pad 20 along the first direction X can be set to 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0060] In this embodiment, the length L2 of the first pad 20 along the first direction X is set to be greater than or equal to 1 mm and less than or equal to 3 mm. This ensures the reliability of the electrical connection between the first pad 20 and the first electrical connector 30, thereby ensuring the photoelectric conversion efficiency of the photovoltaic module, while controlling the manufacturing cost of the photovoltaic module and avoiding excessively high manufacturing costs that could affect its market competitiveness.

[0061] In some embodiments, such as Figure 1 As shown, the first electrical connector 30 has a first projection on the plane where the battery cell 10 is located, and the first adhesive dot 40 has a third projection on the plane where the battery cell 10 is located. The third projection at least partially overlaps with the first projection.

[0062] In this embodiment, the first projection of the first electrical connector 30 on the plane of the solar cell 10 is set to at least partially overlap with the third projection of the first adhesive dot 40 on the plane of the solar cell 10. That is, the first adhesive dot 40 is at least partially disposed between the solar cell 10 and the first electrical connector 30, so as to fix the edge of the first electrical connector 30 along the first direction X through the first adhesive dot 40, avoiding the first electrical connector 30 from shifting during the fabrication of the photovoltaic module, which could lead to a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0063] Furthermore, the above-mentioned arrangement can also prevent excessive adhesive between the first electrical connector 30 and the solar cell 10. During the manufacturing process of the photovoltaic module, the adhesive is prone to overflowing between the first pad 20 and the first electrical connector 30, affecting the reliability of the electrical connection between the first pad 20 and the first electrical connector 30, and thus affecting the photoelectric conversion efficiency of the photovoltaic module.

[0064] In some embodiments, such as Figure 1 As shown, a single first pad 20 may have a first adhesive dot 40 on only one side at most.

[0065] like Figure 1As shown, in this embodiment of the application, the first pad 20 extends along a first direction X, and the first pad 20 has a first end and a second end disposed opposite to each other along the first direction X. The first adhesive dot 40 is spaced apart from the first pad 20 along the first direction X, and the first adhesive dot 40 is located on the side of the first pad 20 away from the second end, or the first adhesive dot 40 is located on the side of the first pad 20 away from the first end. That is, along the first direction X, the first pad 20 has the first adhesive dot 40 on at most one side.

[0066] In this embodiment, the first adhesive dot 20 and the first pad 20 are spaced apart along the first direction X, and the first adhesive dot 40 is located on the side of the first pad 20 away from the first end, and / or, the first adhesive dot 40 is located on the side of the first pad 20 away from the second end. This ensures the reliability of the electrical connection between the first electrical connector 30 and the first pad 20, and prevents the first adhesive dot 40 from overflowing between the first pad 20 and the first electrical connector 30, affecting the reliability of the electrical connection between the first pad 20 and the first electrical connector 30, and thus affecting the photoelectric conversion efficiency of the photovoltaic module.

[0067] In some embodiments, such as Figures 1 to 7 As shown, the first adhesive dot 40 includes multiple first adhesive dots, and two adjacent first adhesive dots 40 are staggered in the first direction X.

[0068] like Figures 1 to 7 As shown, a plurality of first adhesive dots 40 are provided between the first surface of the battery cell 10 and the first electrical connector 30, with adjacent first adhesive dots 40 being staggered in the first direction X. It can be understood that one of the two adjacent first adhesive dots 40 is located away from the first end of its corresponding first pad 20, and the other is located away from the second end of its corresponding first pad 20. That is, one of the two adjacent first adhesive dots 40 is located between the edge of the first electrical connector 30 along the first direction X and the first surface of the battery cell 10, and the other is located between the other edge of the first electrical connector 30 along the first direction X and the first surface of the battery cell 10.

[0069] In this embodiment, by staggering two adjacent first adhesive dots 40 in the first direction X, the first electrical connector 30 is supported on both sides by the multiple first adhesive dots 40, so as to prevent the first electrical connector 30 from shifting along the first direction X, causing the first electrical connector 30 to be connected to the second fine grid 12, resulting in a partial short circuit in the photovoltaic module and affecting the photoelectric conversion efficiency of the photovoltaic module.

[0070] In some embodiments, two adjacent first adhesive dots 40 are located on different sides of different first pads 20 in the first direction X.

[0071] In other words, along the first direction X, two adjacent first adhesive dots 40 are positioned such that one first adhesive dot 40 is located on one side of the first pad 20, and the other first adhesive dot 40 is located on the other side of the adjacent first pad 20 along the second direction Y. This allows the two adjacent first adhesive dots 40 to be staggered in the first direction X. This provides support for the two edges of the first electrical connector 30, preventing the first electrical connector 30 from shifting along the first direction X, which could lead to a partial short circuit in the photovoltaic module and affect its photoelectric conversion efficiency.

[0072] In some embodiments, such as Figure 1 As shown, the photovoltaic module in this embodiment of the application further includes a first insulating block 50, which is disposed between the first electrical connector 30 and the second fine grid 12; along the first direction X, the size of the first insulating block 50 is L3, which satisfies L3 > L1.

[0073] like Figure 1 As shown, the photovoltaic module in this embodiment is a back-contact photovoltaic module. A first insulating block 50 is provided between the first electrical connector 30 and the second fine grid 12 to insulate and isolate the first electrical connector 30 and the second fine grid 12, so as to avoid the first electrical connector 30 and the second fine grid 12 from conducting and causing a partial short circuit in the photovoltaic module, which would affect the photoelectric conversion efficiency of the photovoltaic module.

[0074] It should be noted that in this embodiment, the first insulating block 50 extends along the first direction X, wherein the length L3 of the first insulating block 50 along the first direction X is greater than the width L1 of the first electrical connector 30 along the first direction X. This is to enable the first insulating block 50 to better insulate and isolate the first electrical connector 30 and the second fine grid 12, so as to avoid the first electrical connector 30 and the second fine grid 12 from conducting, which would cause a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module. The first adhesive dot 40 can be disposed between two adjacent first insulating blocks 50 to limit the width and height of the first adhesive dot 40, ensuring a larger aspect ratio to support the first electrical connector 30.

[0075] In some embodiments, such as Figures 1 to 7 As shown, the first adhesive dots 40 include two columns, which are spaced apart in the first direction X, and the single column of first adhesive dots 40 is spaced apart in the second direction Y; the first electrical connector 30 includes a first edge and a second edge that are arranged opposite to each other along the first direction X, the projection of the first edge on the battery cell 10 passes through the projection of one of the columns of first adhesive dots 40 on the battery cell 10, and the projection of the second edge on the battery cell 10 passes through the projection of the other column of first adhesive dots 40 on the battery cell 10.

[0076] like Figures 1 to 7As shown, each first electrical connector 30 corresponds to two rows of first adhesive dots 40. One row of first adhesive dots 40 is located between the first surface of the solar cell 10 and the first edge of the first electrical connector 30, and the other row of first adhesive dots 40 is located between the first surface of the solar cell 10 and the second edge of the first electrical connector 30. This design allows one row of first adhesive dots 40 to support the first edge of the first electrical connector 30, and the other row of first adhesive dots 40 to support the second edge of the first electrical connector 30, thereby preventing the first electrical connector 30 from shifting along the first direction X, which could lead to a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0077] In some embodiments, such as Figure 1 As shown, the first pad 20 includes a plurality of pads, and two adjacent first pads 20 are spaced apart along the second direction Y and are arranged opposite each other in the first direction X.

[0078] Or, such as Figure 2 As shown, the first pad 20 includes multiple pads, and two adjacent first pads 20 are spaced apart along the second direction Y and staggered in the first direction X.

[0079] like Figure 1 As shown, multiple first pads 20 are arranged at relative intervals along the second direction Y, that is, multiple first pads 20 are arranged in a row along the second direction Y. This allows multiple first grids 11 to be connected to the first electrical connector 30 through the multiple first pads 20, ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0080] like Figure 2 As shown, in this embodiment, multiple first pads 20 are arranged at intervals along the second direction Y and staggered in the first direction X. It can be understood that the multiple first pads 20 are arranged in two columns along the second direction Y, one column along the first direction X located near the side of the first electrical connector 30, and the other column along the first direction X located near the other side of the first electrical connector 30. This is to support both sides of the first electrical connector 30 through the two columns of first pads 20, preventing the first electrical connector 30 from shifting along the first direction X, causing the first electrical connector 30 to become conductive with the second fine grid 12, resulting in a partial short circuit in the photovoltaic module and affecting the photoelectric conversion efficiency of the photovoltaic module.

[0081] In some embodiments, such as Figure 7 As shown, the number of first adhesive dots 40 is equal to the number of first solder pads 20; or, as... Figures 1 to 6 As shown, the number of first adhesive dots 40 is less than the number of first pads 20; or in some embodiments, the number of first adhesive dots 40 may be greater than the number of first pads 20.

[0082] like Figure 7As shown, the number of first adhesive dots 40 is equal to the number of first pads 20. That is, each first pad 20 has one first adhesive dot 40 on its outer side along the first direction X. The first adhesive dots 40 fix the first electrical connector 30 to the first surface of the solar cell 10, improving the reliability of the connection between the first electrical connector 30 and the solar cell 10, and preventing the first electrical connector 30 from shifting and conducting with the second grid 12, which could lead to a partial short circuit in the photovoltaic module and affect its photoelectric conversion efficiency. Figure 7 In one embodiment, the first pad 20 can connect two first fine gates 11, and the number of first pads 20 is relative to... Figure 1-6 The number of solutions will be greatly reduced. Furthermore, the first pad 20 can connect more first fine gates 11, and the number of first pads 20 is less. At this time, the number of first adhesive dots 40 can be greater than the number of first pads 20.

[0083] In an electrode pattern structure with a main gate, the number of first pads 20 is less, and the number of first adhesive dots 40 is also greater than the number of first pads 20, in order to ensure sufficient adhesion and prevent lamination tilting.

[0084] Furthermore, the first adhesive dot 40 can also support both sides of the first electrical connector 30, thereby further preventing the first electrical connector 30 from shifting, causing the first electrical connector 30 to conduct with the second fine grid 12, resulting in a partial short circuit in the photovoltaic module and affecting the photoelectric conversion efficiency of the photovoltaic module.

[0085] like Figures 1 to 6 As shown, the number of first adhesive dots 40 is less than the number of first pads 20. That is, some of the first pads 20 have first adhesive dots 40 on their outer side along the first direction X, while other parts of the first pads 20 do not have first adhesive dots 40 on their outer side along the first direction X. By setting first adhesive dots 40 on some of the first pads 40 along the first direction X, the first electrical connector 30 can be firmly fixed to the first surface of the solar cell 10. This avoids setting first adhesive dots 40 on the outer side of other parts of the first pads 20 along the first direction X, thus preventing an excessive number of first adhesive dots 40, which would waste adhesive material. Furthermore, during the photovoltaic module lamination process, overflow of the first adhesive dots 40 could affect the reliability of the electrical connection between the first electrical connector 30 and the first pads 20, thereby affecting the photoelectric conversion efficiency of the photovoltaic module.

[0086] In some embodiments, the photovoltaic module in this application further includes a first bonding layer 60, which is disposed between the first pad 20 and the first electrical connector 30.

[0087] In this embodiment, a first bonding layer 60 can be provided on the side of the first pad 20 away from the battery cell 10. That is, the first bonding layer 60 is provided between the first pad 20 and the first electrical connector 30. The first electrical connector 30 is soldered to the first pad 20 through the first bonding layer 60, thereby improving the reliability of the electrical connection between the first electrical connector 30 and the first pad 20.

[0088] For example, the first bonding layer 60 can be a tin layer or a tin alloy layer. Of course, in this embodiment, there are no major restrictions on the specific material of the first bonding layer 60. In practical applications, those skilled in the art can set the specific material of the first bonding layer 60 as needed.

[0089] In some embodiments, such as Figure 3 As shown, the first pad 20 in this embodiment includes a first pad body 21, the first pad body 21 having a third end and a fourth end disposed opposite to each other along the first direction X; and an end connection portion 22, which is connected to the third end or the fourth end of the first pad body 21 along the first direction X.

[0090] like Figure 3 As shown, the first pad 20 in this embodiment includes a first pad body 21 and an end connection portion 22. The first pad body 21 extends along a first direction X and has a third end and a fourth end disposed opposite to each other along the first direction X. The end connection portion 22 is connected to the third end of the first pad body 21 along the first direction X, or the end connection portion 22 is connected to the fourth end of the first pad body 21 along the first direction X.

[0091] In this embodiment, the first pad 20 includes a first pad body 21 and an end connection portion 22 connected to one end of the first pad body 21. The first electrical connector 30 is connected to the first fine gate 11 through the first pad body 21 to collect the charge carriers collected by the first fine gate 11 and transmit the collected charge carriers to an external circuit. The end connection portion 22 is connected to one end of the first pad body 21. The end connection portion 22 is provided so that when the first electrical connector 30 is offset to a certain extent, the end connection portion 22 can connect the first electrical connector 30 to the first fine gate 11, so that the first electrical connector 30 is connected to the first fine gate 11 and can still transmit the charge carriers collected by the first fine gate 11 to the external circuit.

[0092] It should be noted that during the manufacturing process of photovoltaic modules, the first pad body 21 and the end connection part 22 are integrally formed, and there is no interface between the first pad body 21 and the end connection part 22.

[0093] In some embodiments, such as Figure 9As shown, along the first direction X, the end connection portion 22 has a fifth end connected to the first pad body 21 and a sixth end away from the first pad body 21; along the second direction Y, the size of the fifth end of the end connection portion 22 is L4, and the size of the sixth end of the end connection portion 22 is L5, satisfying L4 > L5.

[0094] like Figure 9 As shown, the end connection portion 22 has a fifth end and a sixth end disposed opposite to each other along the first direction X. The fifth end is the end connected to the first pad body 21, and the sixth end is the end away from the first pad body 21. The dimension L4 of the fifth end of the end connection portion 22 along the second direction Y is greater than the dimension L5 of the sixth end of the end connection portion 22 along the second direction Y. That is, the width of the end of the end connection portion 22 connected to the first pad body 21 along the second direction Y is greater than the width of the other end of the end connection portion 22 away from the first pad body 21 along the second direction Y.

[0095] In this embodiment, by setting the dimension L4 of the end connection portion 22 connected to one end of the first pad body 21 along the second direction Y to be greater than the width L5 of the other end of the end connection portion 22 away from the first pad body 21 along the second direction Y, when the first electrical connector 30 is offset, the end connection portion 22 can connect the first electrical connector 30 to the first fine gate 11, making the first electrical connector 30 and the first fine gate 11 conductive. The first electrical connector 30 can then transfer the charge carriers collected by the first fine gate 11 to the external circuit. Furthermore, the material usage of the end connection portion 22 will be reduced, thereby helping to reduce the manufacturing cost of the photovoltaic module and enhance its market competitiveness.

[0096] In some embodiments, 0.2mm≤L4≤0.5mm is satisfied; and / or 0mm≤L5≤L4.

[0097] In this embodiment, the width L4 of the end connection portion 22 connected to the fifth end of the first pad body 21 along the second direction Y is set to be greater than or equal to 0.2 mm and less than or equal to 0.5 mm. This ensures that, in the event of a misalignment of the first electrical connector 30, the end connection portion 22 can guarantee the reliability of the electrical connection between the first electrical connector 30 and the first fine gate 11.

[0098] For example, the width L4 of the end connection portion 22 connected to the fifth end of the first pad body 21 along the second direction Y can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc.

[0099] In this embodiment, the width L5 of the sixth end of the end connection portion 22 away from the first pad body 21 along the second direction Y is set to be greater than or equal to 0 mm, and less than or equal to the width L4 of the fifth end of the end connection portion 22 connected to the first pad body 21 along the second direction Y. This improves the reliability of the connection between the end connection portion 22 and the first electrical connector 30 and the first fine gate 11, and avoids the width L5 of the sixth end of the end connection portion 22 away from the first pad body 21 along the second direction Y being too small, which would result in poor reliability of the connection between the first electrical connector 30 and the first fine gate 11.

[0100] For example, the width L5 of the sixth end of the end connection portion 22 away from the first pad body 21 along the second direction Y can be 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc.

[0101] In some embodiments, along the first direction X, the sum of the dimensions of the first pad body 21 and the end connection portion 22 is L6, satisfying 1mm≤L6≤3mm.

[0102] In this embodiment, the sum of the dimensions L6 of the first pad body 21 and the end connection portion 22 along the first direction X is set to be greater than or equal to 1 mm and less than or equal to 3 mm. This ensures the reliability of the connection between the first pad body 21 and the end connection portion 22 and the first electrical connector 30 and the first fine gate 11, and ensures that the charge carriers collected by the first fine gate 11 can be transferred to the first electrical connector 30 through the first pad body 21 and / or the end connection portion 22, thereby ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0103] For example, the sum of the dimensions L6 of the first pad body 21 and the end connection portion 22 along the first direction X can be set to 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, etc.

[0104] In some embodiments, along the first direction X, the size of the first pad body 21 is L7, which satisfies L7≥2 / 3*L6.

[0105] In this embodiment, the dimension L7 of the first pad body 21 along the first direction X is set to be greater than or equal to 2 / 3 of the dimension L6 of the first pad body 21 and the end connection portion 22 along the first direction X. This allows the first electrical connector 30 to be connected to the first fine gate 11 through the first pad body 21, thereby further ensuring the reliability of the electrical connection between the first electrical connector 30 and the first fine gate 11.

[0106] It is understood that in this embodiment of the application, the length L7 of the first pad body 21 along the first direction X is set to be greater than or equal to 0.67 mm and less than or equal to 2 mm. For example, the length L7 of the first pad body 21 along the first direction X can be set to 0.67 mm, 0.7 mm, 0.8 mm, 1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 2 mm, etc.

[0107] In some embodiments, such as Figure 9 and Figure 10 As shown, the width of the end connection portion 22 gradually decreases along the second direction Y in the direction extending from the fifth end to the sixth end.

[0108] like Figure 9 and Figure 10 As shown in this embodiment, the width of the end connection portion 22 along the second direction Y gradually decreases from the fifth end to the sixth end. This reduces the material usage of the end connection portion 22, thereby lowering the manufacturing cost of the photovoltaic module, while ensuring the reliability of the connection between the first electrical connector 30 and the first fine grid 11, and thus ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0109] It is understood that the end connection portion 22 in this embodiment can be a tapered structure. Of course, the above are merely individual examples of the specific structure of the end connection portion 22 and are not intended to limit this application. In practical applications, those skilled in the art can also customize the specific structure of the end connection portion 22 as needed.

[0110] In some embodiments, such as Figure 9 and Figure 10 As shown, the end connection portion 22 also has a first side and a second side connected between the fifth end and the sixth end. The first side is a straight structure or an arc structure, and the second side is a straight structure or an arc structure.

[0111] like Figure 9 and Figure 10 As shown, the end connection portion 22 in this embodiment is formed by a fifth end, a first side, a sixth end, and a second side. The fifth end, the first side, the sixth end, and the second side can all be straight structures; that is, the fifth end, the first side, the sixth end, and the second side together form a tapered end connection portion 22.

[0112] Alternatively, the fifth and sixth ends are straight structures, and the first and second sides are arc structures, so that the end connection portion 22, which is formed by the fifth end, the first side, the sixth end and the second side, is a cone-shaped structure.

[0113] Alternatively, the fifth end is a straight structure, and the sixth end, the first side, and the second side are arc-shaped structures, so that the fifth end, the first side, the sixth end, and the second side enclose and form a cone-shaped end connection portion 22.

[0114] Among them, the cone-shaped structure refers to the end connection part 22 having an overall structure similar to a cone structure, except that some of its sides or ends are arc-shaped structures.

[0115] In this embodiment, by setting the first side of the end connection portion 22 to a straight or arc-shaped structure, and setting the second side of the end connection portion 22 to a straight or arc-shaped structure, the end connection portion 22 is facilitated during the manufacturing process of the photovoltaic module. Furthermore, this configuration helps to further improve the reliability of the connection between the end connection portion 22 and the first electrical connector 30 and the first fine grid 11, ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0116] In some embodiments, such as Figures 3 to 5 As shown, along the first direction X, the first adhesive dot 40 is disposed on the side of the end connection portion 22 away from the first pad body 21.

[0117] like Figures 3 to 5 As shown in the embodiment of this application, the first adhesive dot 40 is disposed on the side of the end connection portion 22 away from the first pad body 21, so as to avoid the first adhesive dot 40 overflowing between the first pad body 21 and the first electrical connector 30, affecting the reliability of the electrical connection between the first pad body 21 and the first electrical connector 30, thereby ensuring that the charge carriers collected by the first fine grid 11 can be transmitted through the first pad body 21 to the first electrical connector 30, and then transmitted to the external circuit through the first electrical connector 30, thus ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0118] In some embodiments, the first adhesive dot 40 is spaced apart from the end connection portion 22 along the first direction X; or, the first adhesive dot 40 at least partially covers the end connection portion 22.

[0119] In this embodiment, the first adhesive dot 40 and the end connection portion 22 are spaced apart along the first direction X to prevent the first adhesive dot 40 from overflowing between the end connection portion 22 and the first electrical connector 30 during the manufacturing process of the photovoltaic module, thereby affecting the reliability of the electrical connection between the end connection portion 22 and the first electrical connector 30 and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0120] Alternatively, the first adhesive dot 40 can be partially covered on the end connection portion 22 so that most of the first adhesive dot 40 can be located between the first surface of the cell 10 and the first electrical connector 30. This improves the reliability of the first adhesive dot 40 in fixing the first electrical connector 30 to the first surface of the cell 10, and prevents the first electrical connector 30 from shifting, contacting and conducting with the second grid 12, which could lead to a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0121] In some embodiments, such as Figure 9 As shown, the photovoltaic module in this embodiment of the application further includes a first bonding layer 60, which is disposed between the first pad body 21 and the first electrical connector 30.

[0122] like Figure 9 As shown in this embodiment, a first bonding layer 60 is provided on the side of the first pad body 21 away from the solar cell 10. That is, the first bonding layer 60 is provided between the first pad body 21 and the first electrical connector 30. During the processing of the photovoltaic module, the first bonding layer 60 is heated and melted, connecting the first pad body 21 and the first electrical connector 60 together, making the first pad body 21 and the first electrical connector 60 conductive. The charge carriers collected by the first fine grid 11 can be transferred to the first electrical connector 30 through the first pad body 21 and the first bonding layer 60, and then transferred to the external circuit through the first electrical connector 30.

[0123] In this embodiment, a first bonding layer 60 is provided on the side of the first pad body 21 away from the cell 10, so that the sum of the heights of the first pad body 21 and the first bonding layer 60 is greater than the height of the first insulating block 50, thereby ensuring that the first bonding layer 60 can be electrically connected to the first electrical connector 30 after melting, forming a carrier transport path, ensuring the carrier transport efficiency, and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0124] In some embodiments, two adjacent first pads 20, such as Figure 4 and Figure 5 As shown, the end connection portion 22 is disposed on the same side of the first pad body 21 along the first direction X, or, as... Figure 3 As shown in Figure 5, the end connection portion 22 is disposed on the opposite side of the first pad body 21 along the first direction X.

[0125] like Figure 4 and Figure 5As shown, in two adjacent first pads 20 along the second direction Y, the end connection portion 22 can be disposed on the same side of the first pad body 21 along the first direction X, so that the first electrical connector 30 is connected to the first fine gate 11 through the first pad body 21 located on the same side, thereby improving the reliability of the electrical connection between the first electrical connector 30 and the first fine gate 11, so that the charge carriers collected by the first fine gate 11 can be transmitted to the first electrical connector 30 and transmitted to the external circuit through the first electrical connector 30, thereby ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0126] like Figures 3 to 5 As shown, in two adjacent first pads 20 along the second direction Y, the end connection portion 22 can be disposed on the opposite side of the first pad body 21 along the first direction X. This is to support the first electrical connector 30 on both sides along the first direction X through the first pad body 21, preventing the first electrical connector 30 from shifting and causing the first electrical connector 30 to conduct with the second fine grid 12, resulting in a partial short circuit in the photovoltaic module and affecting the photoelectric conversion efficiency of the photovoltaic module.

[0127] In some embodiments, the first adhesive dot 40 includes at least one of a circular adhesive dot, a square adhesive dot, a rectangular adhesive dot, a triangular adhesive dot, a pentagonal adhesive dot, and a hexagonal adhesive dot. The first adhesive dot 40 is wider along the first direction X, specifically, its width in the first direction X is 0.6-2 mm; while the first adhesive dot 40 is narrower in the second direction Y, specifically, its width in the second direction Y is 0.5-1.6 mm. Furthermore, on the back contact battery, the width of the first adhesive dot 40 along the second direction Y may be limited by the insulating adhesive.

[0128] In this embodiment, the first adhesive dot 40 can be a circular adhesive dot, a square adhesive dot, a rectangular adhesive dot, a triangular adhesive dot, a pentagonal adhesive dot, or a hexagonal adhesive dot. Of course, the first adhesive dot 40 can also be other irregularly shaped adhesive dots.

[0129] It should be noted that, in this embodiment, the specific structure of the first adhesive dot 40 is not subject to excessive restrictions. In practical applications, those skilled in the art can set the specific structure of the first adhesive dot 40 as needed.

[0130] like Figure 11As shown, the first adhesive dot 40 in this embodiment is an irregularly shaped adhesive dot. Taking the photovoltaic module manufacturing process as an example, the first adhesive dot 40 is set first, and then the first electrical connector 30 is set. During the setting process, the first adhesive dot 40 can be a regular-shaped first adhesive dot, such as a square first adhesive dot. After the first electrical connector 30 overlaps with the first adhesive dot 40, the shape of the first adhesive dot 40 changes, thereby forming an irregularly shaped first adhesive dot 40. That is to say, the first adhesive dot 40 is ultimately formed as an irregularly shaped structure.

[0131] In some embodiments, the first adhesive dot 40 has a third projection on the plane where the battery cell 10 is located, and the area of ​​the third projection is S1; the first adhesive dot 40 located between the battery cell 10 and the first electrical connector 30 has a fourth projection on the plane where the battery cell 10 is located, and the area of ​​the fourth projection is S2, satisfying S2≥0.5*S1.

[0132] In this embodiment, the area of ​​the third projection of the first adhesive dot 40 on the plane of the solar cell 10 is set as S1, and the area of ​​the fourth projection of the first adhesive dot 40 located between the solar cell 10 and the first electrical connector 30 on the plane of the solar cell 10 is set as S2, where S2 is greater than or equal to 0.5 times S1. That is, at least half of the first adhesive dot 40 is located between the solar cell 10 and the first electrical connector 30 to ensure that the first adhesive dot 40 can securely connect the first electrical connector 30 to the first surface of the solar cell 10, preventing the first electrical connector 30 from shifting, contacting and conducting with the second fine grid 12, which could lead to a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0133] For example, S2 = 0.5 * S1; or, S2 = 0.6 * S1; or, S2 = 0.7 * S1; or, S2 = 0.8 * S1; or, S2 = 0.9 * S1; or, S2 = S1, etc.

[0134] In some embodiments, along the second direction Y, the solar cell 10 has a third side and a fourth side disposed opposite to each other; the photovoltaic module also includes a second adhesive dot 70, which is disposed on a first surface of the solar cell 10 and between the solar cell 10 and the first electrical connector 30. Along the second direction Y, the second adhesive dot 70 is located between the first pad 20 closest to the third side and the third side, or the second adhesive dot 70 is located between the first pad 20 closest to the fourth side and the fourth side.

[0135] In this embodiment, the battery cell 10 is a rectangular battery cell, and the battery cell 10 has a third side and a fourth side disposed opposite to each other along the second direction Y. A first end line is provided on the surface of the battery cell 10. The first end line is disposed between the first pad 20 closest to the third side and the third side, and one end of the first end line is connected to the first pad 20, and the other end extends along the second direction Y to a position of the battery cell 10 near the third side. The first end line is connected to multiple first fine grids 11 so as to collect the charge carriers collected by the multiple first fine grids 11 in the region of the battery cell 10 near the third side through the first end line, and directly transmit the collected charge carriers to the first electrical connector 30, or, the collected charge carriers are first transmitted to the first pad 20, then transmitted to the first electrical connector 30 through the first pad 20, and then transmitted to the external circuit through the first electrical connector 30.

[0136] And / or, the surface of the battery cell 10 is also provided with a second terminal line. The second terminal line is located between the first pad 20 closest to the fourth side and the fourth side. One end of the second terminal line is connected to the first pad 20, and the other end extends along the second direction Y to the position of the battery cell 10 near the fourth side. The second terminal line is connected to multiple first fine grids 11 to collect the charge carriers collected by the multiple first fine grids 11 in the region of the battery cell 10 near the fourth side through the second terminal line, and directly transmit the collected charge carriers to the first electrical connector 30. Alternatively, the collected charge carriers are first transmitted to the first pad 20, then transmitted to the first electrical connector 30 through the first pad 20, and then transmitted to the external circuit through the first electrical connector 30.

[0137] like Figure 6 and Figure 7 As shown, a second adhesive dot 70 is provided on the first surface of the battery cell 10. The second adhesive dot 70 is disposed between the first surface of the battery cell 10 and the first electrical connector 30, and the second adhesive dot 70 is located along the second direction Y near the third side of the battery cell 10, so as to connect the first electrical connector 30 to the first surface of the battery cell 10 near the third side through the second adhesive dot 70, so as to prevent the portion of the first electrical connector 30 near the third side from shifting. Alternatively, the second adhesive dot 70 is located along the second direction Y near the fourth side of the battery cell 10, so as to prevent the portion of the first electrical connector 30 near the fourth side from shifting.

[0138] For example, such as Figure 6 and Figure 7As shown, the second adhesive dot 70 is at least partially located between the first terminal line and the first electrical connector 30. Alternatively, the second adhesive dot 70 is at least partially located between the second terminal line and the first electrical connector 30. The second adhesive dot 70 connects the first electrical connector 30 to the first terminal line and / or the second terminal line, causing the first electrical connector 30 to contact and conduct with the first terminal line and / or the second terminal line, thereby collecting the charge carriers collected by the first terminal line and the second terminal line and transferring the collected charge carriers to an external circuit.

[0139] In some embodiments, such as Figure 6 and Figure 7 As shown, the first electrical connector 30 has a first projection on the plane where the battery cell 10 is located, and the second adhesive dot 70 has a fifth projection on the plane where the battery cell 10 is located, with the fifth projection falling into the first projection.

[0140] like Figure 6 and Figure 7 As shown, the fifth projection of the second adhesive dot 70 on the plane where the cell 10 is located is set to fall within the first projection of the first electrical connector 30 on the plane where the cell 10 is located. That is, all the second adhesive dots 70 are located between the first surface of the cell 10 and the first electrical connector 30, so that the second adhesive dots 70 can firmly bond the first electrical connector 30 to the first surface of the cell 10, and prevent the end of the first electrical connector 30 near the third side or the end of the first electrical connector 30 near the fourth side from shifting and contacting the second grid 12 and conducting, which would cause a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0141] In some embodiments, such as Figure 6 and Figure 7 As shown, the first adhesive dot 40 has a third projection on the plane where the battery cell 10 is located, and the area of ​​the third projection is S1; the second adhesive dot 70 has a sixth projection on the plane where the battery cell 10 is located, and the area of ​​the sixth projection is S3, satisfying S3 > S1.

[0142] like Figure 6 and Figure 7 As shown, since the charge carriers generated by the first fine grid 11 near the third side of the solar cell 10 can be transmitted to the first pad 20 through the first end line, and the charge carriers generated by the first fine grid 11 near the fourth side of the solar cell 10 can be transmitted to the first pad 20 through the second end line, the size of the second adhesive dot 70 located near the third or fourth side of the solar cell 10 has a relatively small impact on the charge carrier transmission efficiency. However, the second adhesive dot 70 can fix the end of the first electrical connector 30 near the third or fourth side to the first surface of the solar cell 10, preventing the end of the first electrical connector 30 from becoming a free end, shifting, contacting and conducting with the second fine grid 12, which could lead to a partial short circuit in the photovoltaic module.

[0143] In this embodiment, the area S3 of the sixth projection of the second adhesive dot 70 onto the plane of the solar cell 10 is set to be larger than the third projection S1 of the first adhesive dot 40 onto the plane of the solar cell 10. This ensures that the area of ​​the second adhesive dot 70 is large enough to securely connect the end of the first electrical connector 30 near the third or fourth side to the first surface of the solar cell 10, preventing the end of the first electrical connector 30 from shifting and causing a partial short circuit in the photovoltaic module.

[0144] In some embodiments, the second adhesive dot 70 includes a circular adhesive dot with a diameter of d2, satisfying 0.5mm≤d2≤0.7mm.

[0145] In this embodiment, when the second adhesive dot 70 is circular, its diameter d2 is set to be greater than or equal to 0.5 mm and less than or equal to 0.7 mm. This ensures the second adhesive dot 70 is large enough to securely connect the first electrical connector 30 to the first surface of the solar cell 10, preventing end displacement of the first electrical connector 30 and thus avoiding partial short circuits in the photovoltaic module. Furthermore, it prevents the second adhesive dot 70 from being too large, which could melt during photovoltaic module fabrication and overflow between the first bonding layer 60 and the first electrical connector 30, affecting the reliability of the electrical connection between them.

[0146] For example, when the second adhesive dot 70 is a circular adhesive dot, the diameter d2 of the second adhesive dot 70 can be set to 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, etc.

[0147] In some embodiments, the number of first adhesive dots 40 is m, satisfying m≥2.

[0148] In this embodiment, the number m of the first adhesive dots 40 is set to be greater than or equal to 2, so that the first adhesive dots 40 can bond the middle position of the first electrical connector 30 to the first surface of the battery cell 10, avoiding the middle position of the first electrical connector 30 from shifting and becoming connected to the second fine grid 12, which would cause a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0149] It should be noted that the number m of the first adhesive dots 40 is a positive integer greater than or equal to 2. For example, the number m of the first adhesive dots 40 can be set to 2, 3, 4, 5, 6, 7, 8, 9, etc.

[0150] In some embodiments, such as Figure 1As shown, along the first direction X, the distance between the end of the first bonding layer 60 and the first adhesive dot 40 near the corresponding end of the first bonding layer 60 is L8, which satisfies L8≥0.4mm.

[0151] like Figure 1 As shown, the first bonding layer 60 has a seventh end and an eighth end disposed opposite to each other along the first direction X. When the seventh end is the end closest to the first adhesive dot 40, the distance between the seventh end and the position of the first adhesive dot 40 near the seventh end is L8, and L8 is greater than or equal to 0.4 mm. This arrangement prevents the first adhesive dot 40 from melting due to heat during photovoltaic module processing and overflowing between the first bonding layer 60 and the first electrical connector 30, thus affecting the reliability of the electrical connection between the first bonding layer 60 and the first electrical connector 30.

[0152] For example, the distance L8 between the end of the first bonding layer 60 and the first adhesive dot 40 near the corresponding end of the first bonding layer 60 can be set to 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, etc.

[0153] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0154] Although alternative embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the alternative embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0155] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or terminal device that includes that element.

[0156] The technical solution provided by the present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the principle and implementation of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A photovoltaic module, characterized by, The battery piece (10) has a first surface and a second surface arranged oppositely, the first surface of the battery piece (10) is provided with a plurality of fine grids extending along a first direction (X) and arranged at intervals along a second direction (Y), the second direction (Y) intersects the first direction (X); A first pad (20) is arranged on the first surface of the battery piece (10) and is electrically connected with at least part of the fine grids; A first glue point (40) is arranged on the first surface of the battery piece (10), and the first glue point (40) is arranged on one side of the first pad (20) along the first direction (X); A first electrical connecting member (30) is arranged on the first surface of the battery piece (10), the first electrical connecting member (30) extends along the second direction (Y), the first electrical connecting member (30) is electrically connected with the first pad (20), and the first electrical connecting member (30) overlaps the first glue point (40). The first electrical connecting member (30) has a first projection on the plane of the battery piece (10), the first pad (20) has a second projection on the plane of the battery piece (10), and the second projection falls within the first projection.

2. The photovoltaic module of claim 1, wherein, Along the first direction (X), the size of the first electrical connecting member (30) is L1, and the size of the first pad (20) is L2, which satisfies L1>L2.

3. The photovoltaic module of claim 1, wherein, It satisfies 1.2mm≤L1≤5mm; and / or, 1mm≤L2≤3mm.

4. The photovoltaic module of claim 3, wherein, The first electrical connecting member (30) has a first projection on the plane of the battery piece (10), the first glue point (40) has a third projection on the plane of the battery piece (10), and the third projection at least partially overlaps the first projection.

5. The photovoltaic module of claim 1, wherein, At most only one side of a single first pad (20) is provided with the first glue point (40).

6. The photovoltaic module of claim 1, wherein, The first glue point (40) includes a plurality of first glue points (40), and adjacent two first glue points (40) are arranged staggered in the first direction (X); 7. The photovoltaic module of claim 6, wherein, And / or, adjacent two first glue points (40) are respectively located on different sides of different first pads (20) in the first direction (X). The fine grid includes a plurality of first fine grids (11) and a plurality of second fine grids (12) arranged alternately along the second direction (Y), and the first pad (20) is connected with the first fine grid (11); the photovoltaic module further comprises a first insulating block (50) arranged between the first electrical connecting member (30) and the second fine grid (12); 8. The photovoltaic module of claim 3, wherein, Along the first direction (X), the size of the first insulating block (50) is L3, which satisfies L3>L1. The first glue point (40) includes two columns, two columns of first glue points (40) are arranged at intervals in the first direction (X), and a single column of first glue points (40) is arranged at intervals in the second direction (Y); 9. The photovoltaic module of claim 1, wherein, ​ The first electric connecting piece (30) comprises a first edge and a second edge oppositely arranged along the first direction (X), a projection of the first edge on the battery piece (10) passes through a projection on the battery piece (10) of one of the two columns of the first glue points (40), and a projection of the second edge on the battery piece (10) passes through a projection on the battery piece (10) of the other of the two columns of the first glue points (40).

10. The photovoltaic module of claim 1, wherein, The first pad (20) comprises a plurality of pads, and two adjacent first pads (20) are arranged at intervals along the second direction (Y) and oppositely along the first direction (X).

11. The photovoltaic module of claim 1, wherein, The first pad (20) comprises a plurality of pads, and two adjacent first pads (20) are arranged at intervals along the second direction (Y) and oppositely along the first direction (X).

12. The photovoltaic module of claim 1, wherein, The number of the first glue points (40) connected with a single first electric connecting piece (30) is less than the number of the first pads (20).

13. The photovoltaic module of claim 1, wherein, The photovoltaic module further comprises a first bonding layer (60) arranged between the first pad (20) and the first electric connecting piece (30).

14. The photovoltaic module of claim 1, wherein, The first pad (20) comprises: A first pad body (21) having a third end and a fourth end oppositely arranged along the first direction (X); An end connecting portion (22) connected to the third end or the fourth end of the first pad body (21) along the first direction (X).

15. The photovoltaic module of claim 14, wherein, Along the first direction (X), the end connecting portion (22) has a fifth end connected to the first pad body (21) and a sixth end away from the first pad body (21); Along the second direction (Y), the size of the fifth end of the end connecting portion (22) is L4, and the size of the sixth end of the end connecting portion (22) is L5, satisfying L4>L5.

16. The photovoltaic module of claim 15, wherein, Along the direction from the fifth end to the sixth end of the end connecting portion (22), the width of the end connecting portion (22) along the second direction (Y) gradually decreases.

17. The photovoltaic module of claim 14, wherein, Along the first direction (X), the first glue point (40) is arranged on the side of the end connecting portion (22) away from the first pad body (21).

18. The photovoltaic module of claim 17, wherein, Along the first direction (X), the first glue point (40) is arranged at intervals with the end connecting portion (22). Alternatively, the first glue point (40) at least partially covers the end connecting portion (22).

19. The photovoltaic module of claim 14, wherein, The photovoltaic module further comprises a first bonding layer (60) arranged between the first pad body (21) and the first electric connecting piece (30).

20. The photovoltaic module of claim 14, wherein, Two adjacent first pads (20), the end connecting portion (22) is arranged on the same side of the first pad body (21) along the first direction (X), or the end connecting portion (22) is arranged on the opposite side of the first pad body (21) along the first direction (X).

21. The photovoltaic module of claim 1, wherein, Along the second direction (Y), the battery piece (10) has a third side edge and a fourth side edge oppositely arranged; The photovoltaic module further comprises a second glue dot (70) disposed on the first surface of the cell sheet (10), the second glue dot (70) is disposed between the cell sheet (10) and the first electrical connector (30), along the second direction (Y), the second glue dot (70) is located between the first pad (20) closest to the third side and the third side, or the second glue dot (70) is located between the first pad (20) closest to the fourth side and the fourth side.

22. The photovoltaic module of claim 21, wherein, The first electrical connector (30) has a first projection on the plane where the cell sheet (10) is located, and the second glue dot (70) has a fifth projection on the plane where the cell sheet (10) is located, and the fifth projection falls within the first projection.

23. The photovoltaic module of claim 21, wherein, The first glue dot (40) has a third projection on the plane where the cell sheet (10) is located, and the area of the third projection is S1; The second glue dot (70) has a sixth projection on the plane where the cell sheet (10) is located, and the area of the sixth projection is S3, and S3>S1 is satisfied.

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