Photovoltaic module

Abstract

The utility model discloses a photovoltaic assembly, and belongs to the field of photovoltaic technology. Comprising a battery piece, a first surface of the battery piece is provided with a plurality of grid lines which extend along a first direction and are arranged at intervals along a second direction, and the first surface of the battery piece is provided with texture lines; the plurality of groups of bonding pads are arranged on the first surface of the battery piece, the plurality of groups of bonding pads are arranged at intervals along the first direction, each group of bonding pads comprises a plurality of bonding pads, the plurality of bonding pads are arranged at intervals along the second direction, and each bonding pad is connected to at least one grid line; the number of the conductive connection layers is multiple, the multiple conductive connection layers are arranged at intervals in the first direction, each conductive connection layer comprises multiple conductive connection points, the multiple conductive connection points are arranged at intervals in the second direction, and at least one conductive connection point is arranged on the surface, away from the battery piece, of one bonding pad; the conductive connection points are of a long-strip-shaped structure, and the included angle between the extension direction of the conductive connection points and the texture lines is larger than or equal to 0 degree and smaller than or equal to 45 degrees.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic, and particularly relates to a photovoltaic module. Background Art

[0002] As the core component of a photovoltaic module, a cell can convert solar energy into electrical energy. A plurality of fine grids extending along a first direction and arranged at intervals along a second direction are provided on the surface of the cell, and the electrical energy generated by the cell is collected through the plurality of fine grids. A plurality of groups of pads are also provided on the surface of the main-grid-free cell, the plurality of groups of pads are arranged at intervals along the first direction, each group of pads includes a plurality of pads arranged at intervals along the second direction, and each pad is connected to at least one fine grid. A solder strip extends along the second direction and covers above a group of pads, and the solder strip is connected to the plurality of fine grids through each group of pads, so as to collect the current collected by the plurality of fine grids and transmit the collected current to an external circuit.

[0003] In order to improve the connection reliability between the solder strip and each group of pads, a conductive connection layer is provided between the pad and the solder strip. In the prior art, usually, a screen printing method is adopted to print a conductive connection material on the surface of the pad to form a conductive connection layer. However, the conductive connection layer in the prior art has problems such as poor printability, low printing rate, and overflowing of the pad, resulting in poor reliability of the photovoltaic module. Summary of the Utility Model

[0004] The utility model discloses a photovoltaic module to solve or at least partially solve the problems existing in the prior art, that is, the conductive connection layer has poor printability, low printing rate, and overflows the pad, resulting in poor reliability of the photovoltaic module.

[0005] In order to solve the above technical problems, the utility model is implemented as follows:

[0006] The utility model discloses a photovoltaic module, which comprises a battery cell. A first surface of the battery cell has a plurality of grid lines extending in a first direction and arranged at intervals in a second direction. The first surface of the battery cell has texture lines, and the texture lines include one of a plurality of pyramid structures arranged linearly, a plurality of pyramid base structures or a plurality of square groove structures. The second direction intersects the first direction. A plurality of groups of pads are all arranged on the first surface of the battery cell. The plurality of groups of pads are arranged at intervals in the first direction. Each group of pads includes a plurality of pads, and the plurality of pads are arranged at intervals in the second direction. Each pad is connected to at least one of the grid lines. A conductive connection layer includes a plurality of groups. The plurality of groups of conductive connection layers are arranged at intervals in the first direction. Each group of conductive connection layers includes a plurality of conductive connection points. The plurality of conductive connection points are arranged at intervals in the second direction. At least one of the conductive connection points is arranged on a surface of a pad away from the battery cell. Wherein, the conductive connection point has a strip-shaped structure, and an included angle between an extending direction of the conductive connection point and the texture line is greater than or equal to 0° and less than or equal to 45°.

[0007] In an embodiment of the utility model, a conductive connection point is arranged on a surface of a pad away from the battery cell, the conductive connection point is arranged to have a strip-shaped structure, and an included angle between an extending direction of the conductive connection point and the texture line is set to be greater than or equal to 0° and less than or equal to 45°. So as to improve the integrity of printing of the conductive connection point, avoid the situation of missing printing or incomplete printing of the conductive connection point, and help to improve the printing speed of the conductive connection point.

[0008] In an embodiment of the utility model, an included angle between an extending direction of the conductive connection point and the texture line is set to be greater than or equal to 0 degree and less than or equal to 45 degrees, so that an extending direction of the conductive connection point and an extending direction of a solder strip have a nearly perpendicular state, and thus the reliability of connection between the solder strip and the pad can be improved through the conductive connection point.

[0009] Further, through the above setting, it is also possible to avoid the conductive connection point overflowing from the surface of the pad, resulting in a short circuit phenomenon of the photovoltaic module. Thus, it helps to improve the reliability of connection between the solder strip and the pad and improve the photoelectric conversion efficiency of the photovoltaic module.

[0010] Optionally, an included angle between an extending direction of the conductive connection point and the texture line is greater than or equal to 0° and less than or equal to 30°.

[0011] In the embodiment of the present utility model, the included angle between the extending direction of the conductive connection point and the texture line is set to be greater than or equal to 0° and less than or equal to 30°. This is to further improve the integrity of the printing of the conductive connection point, avoid the situation of missing printing or incomplete printing of the conductive connection point, and thus further improve the printing speed of the conductive connection point.

[0012] Furthermore, the above setting can further avoid the situation where the conductive connection point overflows the surface of the pad. This helps to improve the reliability of the connection between the solder strip and the pad, and improve the photoelectric conversion efficiency of the photovoltaic module.

[0013] Optionally, along the first direction, the cell has a first side and a second side which are oppositely arranged; the included angle between the conductive connection point close to the first side or the second side and the texture line is a first included angle, and the included angle between the conductive connection point relatively far from the first side or the second side and the texture line is a second included angle, and the first included angle is greater than the second included angle.

[0014] In the embodiment of the present utility model, along the first direction, the first included angle between the conductive connection point close to the first side or the second side of the cell and the texture line is set to be greater than the second included angle between the conductive connection point relatively far from the first side or the second side of the cell and the texture line. This makes the printing integrity of the conductive connection point relatively high, avoids the situation of missing printing or incomplete printing of the conductive connection point, and thus helps to improve the printing speed of the conductive connection point. Furthermore, the above setting can also avoid the situation where the conductive connection point overflows the surface of the pad, thereby helping to improve the reliability of the connection between the solder strip and the pad, and improving the photoelectric conversion efficiency of the photovoltaic module.

[0015] Optionally, the conductive connection point extends along the first direction, and the first direction is the same as the forward direction of the squeegee during the printing of the conductive connection layer.

[0016] In the embodiment of the present utility model, a conductive connection point is provided on the surface of the pad away from the cell, the conductive connection point is set in a strip-shaped structure, and the extending direction of the conductive connection point is the same as the forward direction of the squeegee during the printing of the conductive connection layer. This can improve the integrity of the printing of the conductive connection point, avoid the situation of missing printing or incomplete printing of the conductive connection point, and help to improve the printing speed of the conductive connection point.

[0017] Furthermore, through the above setting, it can also avoid the conductive connection point overflowing the surface of the pad, resulting in a short circuit phenomenon in the photovoltaic module. This helps to improve the reliability of the connection between the solder strip and the pad, and improve the photoelectric conversion efficiency of the photovoltaic module.

[0018] Moreover, the above settings ensure that the trailing during the printing of the conductive connection points is on the pad. The conductive connection points shrink during the curing process, which helps increase the height of the conductive connection points, making the height of the conductive connection points greater than that of the insulating glue, improving the reliability of the connection between the solder tape and the conductive connection points, and avoiding problems such as poor soldering.

[0019] Optionally, along the second direction, each group of the pads includes a first pad and a second pad, and the area of the first pad is larger than that of the second pad; at least two of the conductive connection points are disposed on the surface of the same first pad away from the solar cell, and at least two of the conductive connection points are arranged at intervals along the second direction.

[0020] In the embodiment of the present invention, by disposing at least two conductive connection points on the surface of the same first pad away from the solar cell, at least two conductive connection points are both in a strip-shaped structure, extend along the first direction, and are arranged at intervals along the second direction. Thereby, the height of the conductive connection layer above the first pad is reduced, and it is avoided that the conductive connection layer above the first pad supports the solder tape, so as to reduce the probability of solder tape deviation, improve the reliability of the connection between the solder tape and the first pad, and improve the photoelectric conversion efficiency of the photovoltaic module.

[0021] Furthermore, through the above settings, the reliability of the connection between the second pad adjacent to the first pad and the solder tape can also be improved, thereby further improving the yield of the photovoltaic module and increasing the photoelectric conversion efficiency of the photovoltaic module.

[0022] Optionally, along the second direction, the solar cell has a third side and a fourth side which are oppositely arranged, wherein the first pad is located in a region close to the third side or the fourth side, and the second pad is located in a region relatively far from the third side or the fourth side.

[0023] In the embodiment of the present invention, along the second direction B, the first pad is arranged in a region close to the third side or the fourth side of the solar cell, and the second pad is arranged in a region relatively far from the third side or the fourth side. To improve the reliability of the connection between the solder tape and the edge region of the solar cell through the first pad, and avoid solder tape deviation, resulting in poor photovoltaic modules.

[0024] Moreover, the size of the first pad is larger, which can also broaden the process window for printing the conductive connection points and improve the error tolerance of the conductive connection points printed out of the first pad.

[0025] Furthermore, as a marking point during the printing process of the conductive connection layer, the first pad has a larger size, which can provide a regular and square marking point for the capture camera and improve the printing yield of the conductive connection layer.

[0026] Optionally, the pad has a strip-like structure and extends along the first direction; on the plane where the cell is located, the pad has a first projection, and the conductive connection point has a second projection, and the second projection falls within the first projection.

[0027] In the embodiment of the present invention, on the plane where the cell is located, the pad has a first projection, the conductive connection point has a second projection, and the second projection falls within the first projection. The conductive connection point will not overflow the surface of the pad away from the cell, so as to improve the reliability of the connection between the solder strip and the pad and improve the photoelectric conversion efficiency of the photovoltaic module.

[0028] Optionally, along the first direction, the length of the pad is L1, and the length of the conductive connection point is L2, satisfying 0.85L1 ≤ L2 ≤ 0.95L1.

[0029] Through the above settings, the conductive connection point is long enough along the first direction, and the length of the conductive connection point can be greater than the width of the solder strip, thereby improving the reliability of the connection between the solder strip and the conductive connection point.

[0030] The above settings can also prevent the conductive connection point from overflowing the surface of the pad, resulting in a short circuit phenomenon in the photovoltaic module. Thereby, it helps to improve the reliability of the connection between the solder strip and the pad and improve the photoelectric conversion efficiency of the photovoltaic module.

[0031] Furthermore, the above settings can also make the trailing of the conductive connection point during the printing process on the pad. The conductive connection point shrinks during the curing process, which helps to increase the height of the conductive connection point, make the height of the conductive connection point greater than the height of the insulating glue, improve the reliability of the connection between the solder strip and the conductive connection point, and avoid problems such as virtual soldering.

[0032] Optionally, L2 = 0.9L1 is satisfied. As a preferred embodiment, in the embodiment of the present invention, the length L2 of the conductive connection point is set to be equal to 0.9 times the length L1 of the pad, so as to improve the reliability of the connection between the solder strip and the pad, improve the photoelectric conversion efficiency of the photovoltaic module, and avoid problems such as virtual soldering.

[0033] Optionally, the photovoltaic module further includes a solder strip, wherein the solder strip extends along the second direction and is connected to a group of the pads through a group of the conductive connection layers.

[0034] In the embodiment of the present invention, the solder strip extends along the second direction and covers the surface of a group of conductive connection points away from the pads, so as to connect the solder strip to a group of pads through a group of conductive connection points, thereby improving the reliability of the connection between the solder strip and the pads and improving the photoelectric conversion efficiency of the photovoltaic module.

[0035] Optionally, the pad is in one of a rectangular structure, a quasi-rectangular structure, a polygonal structure, and an elliptical structure; and / or, the conductive connection point is in one of a rectangular structure, a quasi-rectangular structure, a polygonal structure, and an elliptical structure.

[0036] In an embodiment of the present utility model, the pad is set to be in one of a rectangular structure, a quasi-rectangular structure, a polygonal structure, and an elliptical structure, and the conductive connection point is also set to be in one of a rectangular structure, a quasi-rectangular structure, a polygonal structure, and an elliptical structure, so that the conductive connection point can be printed above the pad, avoiding the conductive connection point being printed out of the pad, which may cause a short-circuit phenomenon in the photovoltaic module. Moreover, the above settings help to improve the reliability of the connection between the solder strip and the pad, and improve the photoelectric conversion efficiency of the photovoltaic module.

[0037] The present utility model discloses a photovoltaic module, which includes a battery cell. The first surface of the battery cell has a plurality of grid lines extending along a first direction and arranged at intervals along a second direction. The first surface of the battery cell has texture lines, and the texture lines include one of a plurality of pyramid structures arranged linearly, a plurality of pyramid base structures, or a plurality of square groove structures. The second direction intersects the first direction; a plurality of groups of pads, and a plurality of groups of the pads are all arranged on the first surface of the battery cell. The plurality of groups of pads are arranged at intervals along the first direction. Each group of pads includes a plurality of pads, and the plurality of pads are arranged at intervals along the second direction. And each pad is connected to at least one of the grid lines; a conductive connection layer, and the conductive connection layer includes a plurality of groups. The plurality of groups of the conductive connection layer are arranged at intervals along the first direction. Each group of the conductive connection layer includes a plurality of the conductive connection points, and the plurality of the conductive connection points are arranged at intervals along the second direction. And each of the conductive connection points is arranged on the surface of a pad away from the battery cell; wherein, the conductive connection point has a strip-shaped structure, and the included angle between the extending direction of the conductive connection point and the texture line is greater than or equal to 0° and less than or equal to 45°.

[0038] In the present utility model, a conductive connection point is arranged on the surface of the pad away from the battery cell. The conductive connection point is set to have a strip-shaped structure, and the included angle between the extending direction of the conductive connection point and the texture line is set to be greater than or equal to 0° and less than or equal to 45°. To improve the integrity of the printing of the conductive connection point, avoid the situation of missing printing or incomplete printing of the conductive connection point, and help to improve the printing speed of the conductive connection point.

[0039] Furthermore, through the above settings, it can also avoid the conductive connection point overflowing the surface of the pad, resulting in a short-circuit phenomenon in the photovoltaic module. Thereby, it helps to improve the reliability of the connection between the solder strip and the pad, and improve the photoelectric conversion efficiency of the photovoltaic module. Description of the Drawings

[0040] Figure 1 Shows a schematic diagram of the screen printing process in the prior art;

[0041] Figure 2 Shows a schematic diagram of a partial structure of a photovoltaic module in the prior art;

[0042] Figure 3 Shows a schematic diagram of the screen printing process in an embodiment of the present invention;

[0043] Figure 4 Shows a schematic diagram of the structure of the photovoltaic module described in an embodiment of the present invention;

[0044] Figure 5 Shows a schematic diagram of a partial structure of the photovoltaic module described in an embodiment of the present invention Figure 1 ;

[0045] Figure 6 Shows a schematic diagram of a partial structure of the photovoltaic module described in an embodiment of the present invention Figure 2 ;

[0046] Figure 7 Shows a partial cross-sectional view of the photovoltaic module described in an embodiment of the present invention;

[0047] Figure 8 Shows a schematic diagram of the structure of the first pad and the second pad described in an embodiment of the present invention;

[0048] Reference numerals:

[0049] 10: cell; 11: texture line; 12: first side; 13: second side; 14: third side; 15: fourth side;

[0050] 20: grid line;

[0051] 30: pad; 31: first pad; 31: second pad;

[0052] 40: conductive connection layer; 41: conductive connection point;

[0053] 50: screen body; 51: screen hole;

[0054] 60: squeegee;

[0055] A: first direction; B: second direction; C: forward direction of the squeegee. Detailed implementation manners

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope fixed by the present utility model.

[0057] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present utility model. Therefore, the "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0058] Referring to Figure 1 , a schematic diagram of a screen printing process in the prior art is shown; referring to Figure 2 , a partial structural schematic diagram of a photovoltaic module in the prior art is shown.

[0059] In the prior art, a conductive connection material is usually printed on the surface of the pad away from the cell by screen printing to form a conductive connection layer on the surface of the pad away from the cell, and the reliability of the connection between the solder tape and the pad is improved through the conductive connection layer.

[0060] As Figure 1 and Figure 2 shown, the conductive connection layer in the prior art is located on the surface of the pad away from the cell, and the conductive connection layer has a strip-shaped structure. The length direction of the conductive connection layer is perpendicular to the advancing direction of the squeegee during printing of the conductive connection layer. The above printing method results in the situation that the conductive connection layer has missing printing and is incomplete, the welding tensile force of the conductive connection layer is low, and the requirement of welding reliability cannot be met. Moreover, the conductive connection layer easily overflows the surface of the pad along the advancing direction of the squeegee, resulting in a short circuit phenomenon in the photovoltaic module. In addition, the slump of the conductive connection layer is relatively high. If the height of the conductive connection layer is lower than the height of the insulating glue between two adjacent conductive connection layers, the reliability of the connection between the solder tape and the conductive connection layer will be affected, resulting in a virtual soldering problem.

[0061] To solve the above technical problems, the present utility model discloses a photovoltaic module, specifically as follows:

[0062] Referring to Figure 3 , a schematic diagram of a screen printing process in the embodiments of the present utility model is shown; referring to Figure 4 , a structural schematic diagram of the photovoltaic module described in the embodiments of the present utility model is shown; referring to Figure 5, showing a partial structural schematic diagram of the photovoltaic module in the embodiment of the present utility model Figure 1 ; Refer to Figure 6 , showing a partial structural schematic diagram of the photovoltaic module in the embodiment of the present utility model Figure 2 ; Refer to Figure 7 , showing a partial cross-sectional view of the photovoltaic module in the embodiment of the present utility model; Refer to Figure 8 , showing a structural schematic diagram of the first pad and the second pad in the embodiment of the present utility model.

[0063] As Figures 3 to 8 shown, an embodiment of the present utility model discloses a photovoltaic module. The photovoltaic module includes a cell 10. The first surface of the cell 10 has a plurality of grid lines 20 extending along a first direction A and arranged at intervals along a second direction B. The first surface of the cell 10 has texture lines 11. The texture lines 11 include one of a plurality of pyramid structures arranged linearly, a plurality of pyramid base structures, or a plurality of square groove structures; a plurality of groups of pads 30 are all arranged on the first surface of the cell 10. The plurality of groups of pads 30 are arranged at intervals along the first direction A. Each group of pads 30 includes a plurality of pads 30. The plurality of pads 30 are arranged at intervals along the second direction B, and each pad 30 is connected to at least one grid line 20; a conductive connection layer 40 includes a plurality of groups. The plurality of groups of conductive connection layers 40 are arranged at intervals along the first direction A. Each group of conductive connection layers 40 includes a plurality of conductive connection points 41. The plurality of conductive connection points 41 are arranged at intervals along the second direction B, and each conductive connection point 41 is arranged on the surface of a pad 30 away from the cell 10; wherein, the conductive connection point 41 has a strip-shaped structure, and the included angle between the extending direction of the conductive connection point 41 and the texture line 11 is greater than or equal to 0° and less than or equal to 45°.

[0064] The photovoltaic module disclosed in the embodiment of the present utility model includes a cell 10. As the core component of the photovoltaic module, the cell 10 can convert solar energy into electrical energy. The cell 10 has a front surface facing the sun, which is also called the light-receiving surface. The cell 10 also has a back surface facing away from the sun, which is also called the backlight surface.

[0065] It should be noted that the first surface of the cell 10 in the embodiment of the present utility model can be the front surface of the cell 10 or the back surface of the cell 10. In this regard, the present utility model does not make a specific limitation. Hereinafter, taking the first surface of the cell 10 as the back surface of the cell 10 as an example, relevant descriptions will be made. That is to say, hereinafter, taking the photovoltaic module as a back-contact photovoltaic module as an example, relevant descriptions will be made.

[0066] As Figures 3 to 8As shown in the figure, the back surface of the solar cell 10 has a plurality of grid lines 20 extending along the first direction A and arranged at intervals along the second direction B. The plurality of grid lines 20 collect the current generated by the solar cell 10. Among the plurality of grid lines 20, there are positive grid lines and negative grid lines, and the positive grid lines and negative grid lines are arranged alternately. Exemplarily, along the second direction B, there is a negative grid line between two adjacent positive grid lines, and there is a positive grid line between two adjacent negative grid lines.

[0067] As Figures 3 to 8 shown in the figure, a plurality of groups of pads 30 are further provided on the back surface of the solar cell 10. The plurality of groups of pads 30 are arranged at intervals along the first direction A. Each group of pads 30 includes a plurality of pads 30, and the plurality of pads 30 are arranged at intervals along the second direction B. And each pad 30 is connected to at least one grid line 20. The solder strip extends along the second direction B and is disposed above each group of pads 30. The solder strip is connected to the plurality of grid lines 20 through each group of pads 30 to collect the current collected by the plurality of grid lines 20 and transmit it to an external circuit.

[0068] The photovoltaic module disclosed in the embodiment of the present invention further includes a conductive connection layer 40. The conductive connection layer 40 is disposed between the solder strip and the pad 30 to improve the connection reliability between the solder strip and the pad 30 through the conductive connection layer 40.

[0069] As Figures 3 to 8 shown in the figure, the conductive connection layer 40 includes a plurality of groups. The plurality of groups of conductive connection layers 40 are arranged at intervals along the second direction B. Each group of conductive connection layers 40 includes a plurality of conductive connection points 41. Each conductive connection point 41 is disposed on the surface of a pad 30 away from the solar cell 10. It can be understood that at least one conductive connection point 41 is disposed on the surface of each pad 30 away from the solar cell 10 to improve the connection reliability between the solder strip and the pad 30 through at least one conductive connection point 41.

[0070] It should be noted that in the embodiment of the present invention, the conductive welding material is usually printed on the surface of the pad 30 away from the solar cell 10 by screen printing to form the conductive connection layer 40. Exemplarily, the conductive welding material can be tin paste, aluminum paste, etc. In the embodiment of the present invention, there is no excessive limitation on the specific material of the conductive welding material. In actual applications, those skilled in the art can select appropriate materials according to needs.

[0071] In the embodiment of the present utility model, the solar cell 10 is cut from a silicon rod. Therefore, the light-receiving surface and the backlight surface of the solar cell 10 both have texture lines 11, that is to say, the first surface and the second surface of the solar cell 10 both have texture lines 11. The first surface and the second surface of the solar cell 10 both have texture lines 11. The texture lines 11 include a plurality of pyramid structures, a plurality of pyramid base structures or a plurality of square groove structures. The plurality of pyramid structures, the plurality of pyramid base structures or the plurality of square groove structures are arranged at intervals to form the texture lines 11 in a linear structure. And the extending direction of the texture lines 11 is generally the same as the first direction A, that is, the extending direction of the texture lines 11 is the same as the extending direction of the grid lines 20.

[0072] As Figure 5 shown, in the embodiment of the present utility model, the conductive connection point 41 is in a strip-shaped structure, and the included angle between the extending direction of the strip-shaped conductive connection point 41 and the texture lines 11 is greater than or equal to 0° and less than or equal to 45°. It should be noted that in the embodiment of the present utility model, the extending direction of the conductive connection point 41 is its length direction. In the manufacturing process, the extending direction of the conductive connection point 41 is its printing direction.

[0073] Exemplarily, the included angle between the extending direction of the strip-shaped conductive connection point 41 and the texture lines 11 can be 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, etc. The above are only examples of the specific included angle between the extending direction of the conductive connection point 41 and the texture lines 11, and do not limit the present utility model. In actual applications, those skilled in the art can set the included angle between the extending direction of the conductive connection point 41 and the texture lines 11 to any value greater than or equal to 0° and less than or equal to 45°.

[0074] In the embodiment of the present utility model, the conductive connection point 41 is arranged on the surface of the pad 30 away from the solar cell 10. The conductive connection point 41 is arranged in a strip-shaped structure, and the included angle between the extending direction of the conductive connection point 41 and the texture lines 11 is set to be greater than or equal to 0° and less than or equal to 45°. To improve the integrity of the printing of the conductive connection point 41, avoid the situation of missing printing of the conductive connection point 41 or incomplete printing of the conductive connection point 41, and help to improve the printing speed of the conductive connection point 41.

[0075] In the embodiment of the present utility model, the included angle between the extending direction of the conductive connection point 41 and the texture lines 11 is set to be greater than or equal to 0 degree and less than or equal to 45 degrees, so that the extending direction of the conductive connection point 41 and the extending direction of the solder tape are in a nearly perpendicular state, thereby improving the reliability of the connection between the solder tape and the pad 30 through the conductive connection point 41.

[0076] Furthermore, through the above settings, it is also possible to prevent the conductive connection point 41 from overflowing the surface of the pad 30, which may cause a short - circuit phenomenon in the photovoltaic module. This helps to improve the reliability of the connection between the solder tape and the pad 30, and enhance the photoelectric conversion efficiency of the photovoltaic module.

[0077] Preferably, the angle between the extending direction of the conductive connection point 41 and the texture line 11 is greater than or equal to 0° and less than or equal to 30°. Exemplarily, the angle between the extending direction of the conductive connection point 41 and the texture line 11 is 0°, 6°, 12°, 18°, 24°, 30°, etc.

[0078] As a preferred embodiment, in the embodiment of the present invention, the angle between the extending direction of the conductive connection point 41 and the texture line 11 is set to be greater than or equal to 0° and less than or equal to 30°. This is to further improve the integrity of the printing of the conductive connection point 41, avoid the situation of missing printing or incomplete printing of the conductive connection point 41, and thus further improve the printing speed of the conductive connection point 41.

[0079] Certainly, the above settings can also further prevent the conductive connection point 41 from overflowing the surface of the pad 30. This helps to improve the reliability of the connection between the solder tape and the pad 30, and enhance the photoelectric conversion efficiency of the photovoltaic module.

[0080] As shown in Figure 5 the figure, along the first direction A, the cell 10 has a first side 12 and a second side 13 which are oppositely arranged. There is a first angle between the conductive connection point 41 close to the first side 12 or the second side 13 and the texture line 11, and there is a second angle between the conductive connection point 41 relatively far from the first side 12 or the second side 13 and the texture line 11, and the second angle is greater than the first angle.

[0081] As shown in Figure 5 the figure, the texture lines 11 on the surface of the cell 10 are arc - shaped, and the texture lines 11 extend from the first side 12 of the cell 10 to the second side 13 of the cell 10. Along the second direction B, the cell 10 has a third side 14 and a fourth side 15 which are oppositely arranged. Along the second direction B, the middle part of the texture line 11 bends towards the direction close to the third side 14, while both ends of the texture line 11 bend towards the direction close to the fourth side 15.

[0082] The conductive connection point 41 is printed on the surface of the pad 30 away from the cell 10 by screen printing. During the printing process, the direction of each conductive connection point 41 is the same. This forming method of the conductive connection point 41 results in that the first angle between the conductive connection point 41 close to the first side 12 or the second side 13 and the texture line 11 is greater than the second angle between the conductive connection point 41 relatively far from the first side 12 or the second side 13 and the texture line 11.

[0083] That is to say, along the first direction A, the first included angle between the conductive connection point 41 close to the first side 12 or the second side 13 of the battery cell 10 and the texture line 11 is greater than the second included angle between the conductive connection point 41 relatively far from the first side 12 or the second side 13 of the battery cell 10 and the texture line 11. This enables a relatively high printing integrity of the conductive connection point 41, avoiding the situations of missing printing or incomplete printing of the conductive connection point 41, and thus helps to improve the printing speed of the conductive connection point 41.

[0084] Furthermore, the above setting can also avoid the situation where the conductive connection point 41 overflows the surface of the pad 30, thereby helping to improve the reliability of the connection between the solder strip and the pad 30 and enhancing the photoelectric conversion efficiency of the photovoltaic module.

[0085] Optionally, the conductive connection point 41 extends along the first direction A, and the first direction A is the same as the advancing direction of the squeegee 60 during the printing of the conductive connection layer 40.

[0086] As Figures 3 to 8 shown, the conductive connection point 41 in the embodiment of the present invention has a strip-shaped structure, and the length direction of the conductive connection point 41 is the first direction A, while the first direction A is the same as the advancing direction of the squeegee 60 during the printing of the conductive connection layer 40. That is to say, during the printing of the conductive connection layer 40, the advancing direction of the squeegee 60 is the same as the length direction of the conductive connection point 41.

[0087] In the embodiment of the present invention, the conductive connection point 41 is arranged on the surface of the pad 30 away from the battery cell 10, and the conductive connection point 41 is arranged in a strip-shaped structure, and the extending direction of the conductive connection point 41 is the same as the advancing direction of the squeegee 60 during the printing of the conductive connection layer 40. Thereby, the printing integrity of the conductive connection point 41 can be improved, avoiding the situations of missing printing or incomplete printing of the conductive connection point 41, and it helps to improve the printing speed of the conductive connection point 41.

[0088] Furthermore, through the above setting, it can also avoid the conductive connection point 41 overflowing the surface of the pad 30, resulting in a short circuit phenomenon in the photovoltaic module. Thereby, it helps to improve the reliability of the connection between the solder strip and the pad 30 and enhances the photoelectric conversion efficiency of the photovoltaic module.

[0089] Moreover, the above setting makes the trailing of the conductive connection point 41 during the printing process on the pad 30. The conductive connection point 41 shrinks during the curing process, which helps to increase the height of the conductive connection point 41, making the height of the conductive connection point 41 greater than the height of the insulating glue, improving the reliability of the connection between the solder strip and the conductive connection point 41, and avoiding problems such as false soldering.

[0090] Optionally, along the second direction B, each group of pads 30 includes a first pad 31 and a second pad 32, and the area of the first pad 31 is larger than that of the second pad 32; at least two conductive connection points 41 are disposed on the surface of the same first pad 31 away from the cell 10, and the at least two conductive connection points 41 are arranged at intervals along the second direction B.

[0091] In the embodiment of the present invention, by disposing at least two conductive connection points 41 on the surface of the same first pad 31 away from the cell 10, the at least two conductive connection points 41 are both in a strip-like structure, extend along the first direction A, and are arranged at intervals along the second direction B. Thereby reducing the height of the conductive connection layer 40 above the first pad 31, preventing the conductive connection layer 40 above the first pad 31 from supporting the solder strip, reducing the probability of solder strip deviation, improving the reliability of the connection between the solder strip and the first pad 31, and improving the photoelectric conversion efficiency of the photovoltaic module.

[0092] Furthermore, through the above settings, the reliability of the connection between the second pad 32 adjacent to the first pad 31 and the solder strip can also be improved, thereby further improving the yield of the photovoltaic module and the photoelectric conversion efficiency of the photovoltaic module.

[0093] Optionally, along the second direction B, the cell 10 has a third side 14 and a fourth side 15 which are oppositely arranged, wherein the first pad 31 is located in a region close to the third side 14 or the fourth side 15, and the second pad 32 is located in a region relatively far from the third side 14 or the fourth side 15.

[0094] In the embodiment of the present invention, along the second direction B, the first pad 31 is arranged in a region close to the third side 14 or the fourth side 15 of the cell 10, and the second pad 32 is arranged in a region relatively far from the third side 14 or the fourth side 15. To improve the reliability of the connection between the solder strip and the edge region of the cell 10 through the first pad 31, and prevent the solder strip from deviating, resulting in defective photovoltaic modules.

[0095] Moreover, the size of the first pad 31 is relatively large, which can also broaden the process window for printing the conductive connection points 41 and improve the error tolerance of printing the conductive connection points 41 out of the first pad 31.

[0096] Furthermore, the first pad 31 serves as a marking point during the printing process of the conductive connection layer 40. With a relatively large size, it can provide a regular and square marking point for the capture camera, improving the printing yield of the conductive connection layer 40.

[0097] Optionally, as Figures 3 to 6As shown, the pad 30 in the embodiment of the present utility model has a strip-shaped structure, and the pad 30 extends along the first direction A; on the plane where the battery cell 10 is located, the pad 30 has a first projection, and the conductive connection point 41 has a second projection, and the second projection falls within the first projection.

[0098] As Figures 3 to 6 As shown, the pad 30 in the embodiment of the present utility model has a strip-shaped structure, and the strip-shaped pad 30 extends along the first direction A, while the solder ribbon extends along the second direction B. The extension direction of the pad 30 is set to be perpendicular to the extension direction of the solder ribbon, so that a solder ribbon can be connected to multiple grid lines 20 through a group of pads 30 to collect the current collected by the multiple grid lines 20, thereby improving the reliability of the connection between the solder ribbon and the pad 30 and avoiding the solder ribbon deviating from the pad 30, which affects the photoelectric conversion efficiency of the photovoltaic module.

[0099] In the embodiment of the present utility model, on the plane where the battery cell 10 is located, the pad 30 has a first projection, and the conductive connection point 41 has a second projection, and the second projection falls within the first projection. It can be understood that the conductive connection point 41 in the embodiment of the present utility model will not overflow the surface of the pad 30 away from the battery cell 10, so as to improve the reliability of the connection between the solder ribbon and the pad 30 and improve the photoelectric conversion efficiency of the photovoltaic module. If the conductive connection point 41 overflows the surface of the pad 30 away from the battery cell 10, the photovoltaic module is prone to short-circuit phenomena, which affects the photoelectric conversion efficiency of the photovoltaic module.

[0100] Optionally, along the first direction A, the length of the pad 30 is L1, and the length of the conductive connection point 41 is L2, satisfying 0.85L1 ≤ L2 ≤ 0.95L1.

[0101] In the embodiment of the present utility model, along the first direction A, the length of the pad 30 is set to L1, and the length of the conductive connection point 41 is set to L2, satisfying 0.85L1 ≤ L2 ≤ 0.95L1. Through the above settings, the conductive connection point 41 is long enough along the first direction A, and the length of the conductive connection point 41 can be greater than the width of the solder ribbon, thereby improving the reliability of the connection between the solder ribbon and the conductive connection point 41.

[0102] The above settings can also prevent the conductive connection point 41 from overflowing the surface of the pad 30, resulting in short-circuit phenomena in the photovoltaic module. Thus, it helps to improve the reliability of the connection between the solder ribbon and the pad 30 and improve the photoelectric conversion efficiency of the photovoltaic module.

[0103] Furthermore, the above settings can also make the trailing of the conductive connection point 41 during the printing process on the pad 30. The conductive connection point 41 shrinks during the curing process, which helps to increase the height of the conductive connection point 41, make the height of the conductive connection point 41 greater than the height of the insulating glue, improve the reliability of the connection between the solder ribbon and the conductive connection point 41, and avoid problems such as false soldering.

[0104] Exemplarily, L2 = 0.85L1 is satisfied; alternatively, L2 = 0.87L1 is satisfied; alternatively, L2 = 0.92L1 is satisfied; alternatively, L2 = 0.95L1 is satisfied. Preferably, L2 = 0.9L1 is satisfied.

[0105] Optionally, the photovoltaic module disclosed in the embodiment of the present invention further includes a solder ribbon, wherein the solder ribbon extends along the second direction B and is connected to a set of pads 30 through a set of conductive connection layers 40.

[0106] The photovoltaic module disclosed in the embodiment of the present invention further includes a solder ribbon, the solder ribbon extends along the second direction B and covers the surface of a set of conductive connection points 41 away from the pads 30, so as to connect the solder ribbon to a set of pads 30 through a set of conductive connection points 41, thereby improving the reliability of the connection between the solder ribbon and the pads 30 and improving the photoelectric conversion efficiency of the photovoltaic module.

[0107] It should be noted that the solder ribbons in the embodiment of the present invention include multiple ones, and each solder ribbon is correspondingly arranged with a set of conductive connection points 41 and a set of pads 30, so as to connect one solder ribbon to a set of pads 30 through each set of conductive connection layers 40, thereby collecting the current collected by multiple grid lines 20 through multiple solder ribbons and transmitting the current to an external circuit.

[0108] Optionally, as Figures 3 to 6 shown, the pads 30 in the embodiment of the present invention are in one of a rectangular structure, a quasi-rectangular structure, a polygonal structure, and an elliptical structure; and / or, the conductive connection points 41 are in one of a rectangular structure, a quasi-rectangular structure, a polygonal structure, and an elliptical structure.

[0109] The pads 30 in the embodiment of the present invention can be set to be in a rectangular structure, and the long side of the rectangular structure extends along the first direction A. The pads 30 can be set to be in a quasi-rectangular structure, and the quasi-rectangular structure refers to a rectangular structure with chamfers at all four corners or a rectangular structure with chamfers at some of the four corners, and the length direction of the quasi-rectangular structure is the first direction A. The pads 30 can be set to be in a polygonal structure, and the length direction of the polygonal structure extends along the first direction A. The pads 30 can also be set to be in an elliptical structure, and the major axis of the elliptical structure extends along the first direction A.

[0110] Similarly, the conductive connection point 41 in the embodiment of the present utility model can be set in a rectangular structure, and the length of the rectangular structure extends along the first direction A. The conductive connection point 41 can be set in a quasi-rectangular structure, where the quasi-rectangular structure refers to a rectangular structure with chamfers at all four corners or a rectangular structure with chamfers at some of the four corners, and the length direction of the quasi-rectangular structure is the first direction A. The conductive connection point 41 can be set in a polygonal structure, and the length direction of the polygonal structure extends along the first direction A. The conductive connection point 41 can also be set in an elliptical structure, and the major axis of the elliptical structure extends along the first direction A.

[0111] It should be noted that the structure of the conductive connection point 41 can be the same as that of the pad 30. For example, the conductive connection point 41 is a rectangular structure, and the pad 30 is also a rectangular structure. The structure of the conductive connection point 41 can also be different from that of the pad 30. For example, the conductive connection point 41 is an elliptical structure, while the pad 30 is a rectangular structure.

[0112] In the embodiment of the present utility model, the pad 30 is set to be one of a rectangular structure, a quasi-rectangular structure, a polygonal structure, and an elliptical structure, and the conductive connection point 41 is also set to be one of a rectangular structure, a quasi-rectangular structure, a polygonal structure, and an elliptical structure, so that the conductive connection point 41 can be printed above the pad 30, avoiding the conductive connection point 41 being printed outside the pad 30, which may cause a short circuit phenomenon in the photovoltaic module. Moreover, the above settings help to improve the reliability of the connection between the solder strip and the pad 30 and enhance the photoelectric conversion efficiency of the photovoltaic module.

[0113] As Figure 5 shown, the embodiment of the present utility model also discloses a stencil, which includes a stencil body 50. A plurality of groups of mesh holes 51 are provided on the stencil body 50. The plurality of groups of mesh holes 51 are arranged at intervals along the first direction A. Each group of mesh holes 51 includes a plurality of mesh holes 51. The plurality of mesh holes 51 are arranged at intervals along the second direction B. Among them, the structure of the mesh hole 51 is the same as that of the conductive connection point 41 in the above embodiment. The mesh hole 51 extends along the first direction A, and the first direction A is the same as the forward direction of the squeegee 60 during the printing of the conductive connection layer 40.

[0114] As Figure 5 shown, a plurality of groups of mesh holes 51 are provided on the stencil body 50. The plurality of groups of mesh holes 51 are arranged at intervals along the first direction A. Each group of mesh holes 51 includes a plurality of mesh holes 51. The plurality of mesh holes 51 are arranged at intervals along the second direction B. Each mesh hole 51 has the same structure as the conductive connection point 41. Each mesh hole 51 is in a strip structure, and the extending direction of the strip-shaped mesh hole 51 is the first direction A. The first direction A is the same as the forward direction of the squeegee 60 during the printing of the conductive connection layer 40. That is to say, during the printing of the conductive connection layer 40, the forward direction of the squeegee 60 is the same as the length direction of the conductive connection layer 40.

[0115] In the embodiment of the present utility model, by arranging the mesh holes 51 in a strip structure, and the extending direction of the strip-structured mesh holes 51 is the same as the forward direction of the squeegee 60 during the printing of the conductive connection layer 40. Thus, the integrity of the printing of the conductive connection points 41 can be improved, avoiding the situation of missing printing or incomplete printing of the conductive connection points 41, and it helps to improve the printing speed of the conductive connection points 41.

[0116] Furthermore, through the above settings, it can also prevent the conductive connection points 41 from overflowing the surface of the pads 30, resulting in a short-circuit phenomenon in the photovoltaic module. Thus, it helps to improve the reliability of the connection between the solder tape and the pads 30 and improve the photoelectric conversion efficiency of the photovoltaic module.

[0117] Moreover, with the above settings, the trailing of the conductive connection points 41 during the printing process is on the pads 30, and the conductive connection points 41 contract during the curing process, which helps to increase the height of the conductive connection points 41, making the height of the conductive connection points 41 greater than the height of the insulating glue, improving the reliability of the connection between the solder tape and the conductive connection points 41, and avoiding problems such as false soldering.

[0118] Optionally, as Figure 5 shown, two adjacent groups of mesh holes 51 are arranged staggeredly along the second direction B.

[0119] In the case where the photovoltaic module is a back-contact photovoltaic module, the back surface of the battery cell 10 has a plurality of grid lines 20 extending along the first direction A and spaced apart along the second direction B. Among the plurality of grid lines 20, there are positive grid lines and negative grid lines, and the positive grid lines and the negative grid lines are arranged alternately along the second direction B. Among two adjacent groups of pads 30, if one group of pads 30 is connected to the positive grid line, then the other group of pads 30 is connected to the negative grid line.

[0120] Based on the above settings, in the embodiment of the present utility model, two adjacent groups of mesh holes 51 are arranged staggeredly along the second direction B so that each group of pads 30 can be connected to the corresponding grid line.

[0121] It should be noted that the embodiments in this specification are all described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0122] Although the optional embodiments of the embodiments of the present utility model have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted to include the optional embodiments and all changes and modifications falling within the scope of the embodiments of the present utility model.

[0123] Finally, it should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity from another, and do not necessarily require or imply any actual relationship or order between these entities. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that an article or terminal device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such article or terminal device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the article or terminal device comprising the element.

[0124] The technical solutions provided by the present utility model have been introduced in detail above. Specific examples are used in this text to elaborate on the principle and implementation mode of the present utility model. At the same time, for those of ordinary skill in the art, based on the principle and implementation mode of the present utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A photovoltaic module, characterized in that: include: A battery cell, wherein the first surface of the battery cell has a plurality of grid lines extending along a first direction and arranged at intervals along a second direction, and the first surface of the battery cell has texture lines, wherein the texture lines include one of a plurality of pyramid structures, a plurality of pyramid base structures, or a plurality of square groove structures arranged in a linear manner, and the second direction intersects the first direction; A plurality of groups of pads, the plurality of groups of pads being arranged on the first surface of the battery cell, the plurality of groups of pads being arranged at intervals along the first direction, each group of pads comprising a plurality of pads, the plurality of pads being arranged at intervals along the second direction, and each of the pads being connected to at least one of the gate lines; A conductive connection layer, wherein the conductive connection layer comprises a plurality of groups, the plurality of groups of conductive connection layers are arranged at intervals along the first direction, each group of the conductive connection layers comprises a plurality of conductive connection points, the plurality of conductive connection points are arranged at intervals along the second direction, and at least one of the conductive connection points is disposed on a surface of the solder pad away from the battery cell; The conductive connection point is in a long strip structure, and the angle between the extension direction of the conductive connection point and the texture line is greater than or equal to 0° and less than or equal to 45°.

2. The photovoltaic module according to claim 1, characterized in that: An angle between an extension direction of the conductive connection point and the texture line is greater than or equal to 0° and less than or equal to 30°.

3. The photovoltaic module according to claim 1, characterized in that: Along the first direction, the battery cell has a first side edge and a second side edge that are oppositely arranged; There is a first angle between the conductive connection point close to the first side or the second side and the texture line, and there is a second angle between the conductive connection point relatively far from the first side or the second side and the texture line, and the first angle is greater than the second angle.

4. The photovoltaic module according to claim 1, characterized in that: The conductive connection points extend along the first direction, and the first direction is the same as the forward direction of the scraper when the conductive connection layer is printed.

5. The photovoltaic module according to claim 1, characterized in that: Along the second direction, each group of the pads includes a first pad and a second pad, and an area of ​​the first pad is larger than an area of ​​the second pad; At least two of the conductive connection points are disposed on a surface of the same first pad away from the battery cell, and at least two of the conductive connection points are spaced apart along the second direction.

6. The photovoltaic module according to claim 5, characterized in that: Along the second direction, the battery cell has a third side and a fourth side that are arranged opposite to each other, wherein: The first pad is located in a region close to the third side or the fourth side, and the second pad is located in a region relatively far away from the third side or the fourth side.

7. The photovoltaic module according to claim 1 or 4, characterized in that: The pad is in a long strip structure, and the pad extends along the first direction; On the plane where the battery cell is located, the pad has a first projection, the conductive connection point has a second projection, and the second projection falls within the first projection.

8. The photovoltaic module according to claim 7, characterized in that: Along the first direction, the length of the pad is L1, and the length of the conductive connection point is L2, satisfying 0.85L1≤L2≤0.95L1.

9. The photovoltaic module according to claim 8, characterized in that: Satisfies L2=0.9L1.

10. The photovoltaic module according to claim 1, characterized in that: The photovoltaic module also includes a welding strip, wherein: The soldering strip extends along the second direction and is connected to a group of the soldering pads through a group of the conductive connection layers.

11. The photovoltaic module according to claim 1, characterized in that: The pad is in one of a rectangular structure, a quasi-rectangular structure, a polygonal structure, and an elliptical structure; And / or, the conductive connection point is in one of a rectangular structure, a quasi-rectangular structure, a polygonal structure, and an elliptical structure.

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