Photovoltaic module

Abstract

The embodiment of the utility model provides a photovoltaic module, and the photovoltaic module comprises at least two battery pieces, and the adjacent battery pieces are connected through a welding strip. The battery piece comprises a grid line, a welding part and a main body part, the grid line is arranged on the main body part through the welding part, the main grid comprises a connecting part, a body section and an extending section, the welding part comprises first welding parts arranged at the two opposite ends of the body section, the extending section is located on the side, away from the body section, of the first welding part, and the second welding part is connected with the extending section. The connecting part comprises a first connecting section and a second connecting section, at least part of the connecting part is located on the side, away from the body section, of the first welding part, and at least part of the extending section and at least part of the second welding part are located between the first connecting section and the second connecting section. The first welding part is relatively and fixedly connected with the welding strip, and the second welding part is not relatively and fixedly connected with the welding strip. According to the design, the current collection capability of the edge position can be improved, so that the power stability of the photovoltaic module is improved, and the problem of darkening in an EL test is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of solar energy, in particular to a photovoltaic module. BACKGROUND

[0002] With the development of technology, photovoltaic modules are applied more and more widely. When the cell pieces of the photovoltaic module are processed, the grid lines are used to collect the photo-generated current. However, the grid lines located at the edge of the cell pieces and the grid lines located at the position of the fish-tail structure are prone to breakage, which causes EL test to be dark and the power stability of the photovoltaic module to be poor. CONTENT OF THE UTILITY MODEL

[0003] Embodiments of the present application provide a photovoltaic module for improving the power stability of the photovoltaic module.

[0004] Embodiments of the present application provide a photovoltaic module, which comprises:

[0005] at least two cell pieces;

[0006] a solder strip connecting adjacent cell pieces;

[0007] The cell piece comprises a grid line, a soldering portion and a main body portion. The grid line is arranged on the main body portion through the soldering portion. The grid line comprises a main grid and a sub-grid intersecting with each other. The main grid comprises a connecting portion, a body segment and an extension segment. The soldering portion comprises a first soldering portion and a second soldering portion. The first soldering portion is arranged at opposite ends of the body segment. The connecting portion is arranged at the opposite ends of the body segment. The extension segment is located on a side of the first soldering portion away from the body segment. The second soldering portion is connected with the extension segment. The connecting portion comprises a first connecting segment and a second connecting segment. The first connecting segment and the second connecting segment are arranged along the width direction of the cell piece. At least part of the connecting portion is located on a side of the first soldering portion away from the body segment. At least part of the extension segment is located between the first connecting segment and the second connecting segment. At least part of the second soldering portion is located between the first connecting segment and the second connecting segment.

[0008] The first soldering portion is fixedly connected with the solder strip. The second soldering portion is not fixedly connected with the solder strip.

[0009] In a possible implementation, along the extension direction of the main grid, the extension segment is located between the first soldering portion and the second soldering portion.

[0010] In a possible implementation, along the extension direction of the main grid, part of the extension segment is located on a side of the second soldering portion away from the first soldering portion.

[0011] In a possible implementation, the distance between the first welding portion and the nearest edge of the main body portion is L1, and 7.5 mm≤L1≤11.5 mm, and / or the distance between the second welding portion and the nearest edge of the main body portion is L2, and 3.5 mm≤L2≤8.5 mm, along the extension direction of the main grid.

[0012] In a possible implementation, the distance between the first welding portion and the nearest second welding portion is L3, and 3 mm≤L3≤4 mm.

[0013] In a possible implementation, the number of second welding portions on one side of the first welding portion is , the distance between the first welding portion and the nearest edge of the main body portion is L1, and the distance between the first welding portion and the nearest second welding portion is L3, = (L1 / L3)-1, > 0.

[0014] In a possible implementation, the distance between the first welding portion and the nearest edge of the main body portion is L1, and 7.5 mm≤L1≤11.5 mm, and / or the distance between the second welding portion and the nearest edge of the main body portion is L2, and 3.5 mm≤L2≤8.5 mm, along the extension direction of the main grid.

[0015] In a possible implementation, the first connecting segment and the second connecting segment are perpendicular to the auxiliary grid.

[0016] In a possible implementation, the first connecting segment and the second connecting segment are connected with the first welding portion, or, along the extension direction of the main grid, the connecting portion has a distance from the first welding portion, and the first connecting segment and the second connecting segment are located on opposite sides of the second welding portion.

[0017] In a possible implementation, the area of the first welding portion is 0.6 square microns to 1.4 square microns, and / or the area of the second welding portion is 0.08 square microns to 0.32 square microns.

[0018] This application provides a photovoltaic module comprising at least two solar cells connected by solder strips. Each solar cell includes grid lines, a solder joint, and a main body. The grid lines are disposed on the main body via the solder joints. The main grid includes a connecting portion, a body segment, and an extension segment. The solder joint includes first solder joints located at opposite ends of the body segment. The extension segment is located on the side of the first solder joint away from the body segment. A second solder joint is connected to the extension segment. The connecting portion includes a first connecting segment and a second connecting segment. At least a portion of the connecting segment is located on the side of the first solder joint away from the body segment. At least a portion of the extension segment and at least a portion of the second solder joint are located between the first and second connecting segments. The first solder joint is fixedly connected to the solder strip, while the second solder joint is not fixedly connected to the solder strip. This design improves the current collection capability at the edge, thereby improving the power stability of the photovoltaic module and mitigating the problem of darkening during EL testing. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a photovoltaic module provided in an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the battery cell provided in an embodiment of this application;

[0022] Figure 3 for Figure 2 A schematic diagram of the first embodiment, showing a partial enlarged view of position I;

[0023] Figure 4 for Figure 2 A schematic diagram of the second embodiment, showing a partial enlarged view of position I in the middle;

[0024] Figure 5 for Figure 2 A schematic diagram of the third embodiment, showing a partial enlarged view of position I;

[0025] Figure 6 for Figure 2 A schematic diagram of the fourth embodiment, showing a partial enlarged view of position I;

[0026] Figure 7 for Figure 2 A schematic diagram of the fifth embodiment, showing a partial enlarged view of position I;

[0027] Figure 8 for Figure 2Fig. 6 is a schematic view of a sixth embodiment of the partial enlarged view of the middle I position.

[0028] Reference signs

[0029] 1 - cell;

[0030] 11 - gate line;

[0031] 111 - main gate;

[0032] 111a - body section;

[0033] 111b - extension section;

[0034] 112 - sub gate;

[0035] 12 - welding portion;

[0036] 121 - first welding portion;

[0037] 122 - second welding portion;

[0038] 13 - connecting portion;

[0039] 131 - first connecting section;

[0040] 132 - second connecting section;

[0041] 14 - body portion;

[0042] 2 - solder strip. DETAILED DESCRIPTION

[0043] For better understanding of the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the drawings.

[0044] It should be clear that the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0045] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0046] It should be understood that the term "and / or" used herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0047] like Figure 1 As shown, this application provides a photovoltaic module, which includes at least two solar cells 1 and solder ribbons 2. Adjacent solar cells 1 can be connected by solder ribbons 2. A solar cell 1 can be a whole cell or a half cell. Solar cell 1 includes grid lines 11, a soldering portion 12, and a main body portion 14, as shown... Figure 2 As shown, grid lines 11 are disposed on the main body portion 14, which can be the substrate of the solar cell 1. The grid lines 11 include intersecting main grids 111 and sub-grids 112. Typically, the sub-grids 112 extend along the width direction of the solar cell 1, and the main grids 111 extend along the length direction of the solar cell 1. The sub-grids 112 are used to collect photogenerated current, and the main grids 111 are used to collect current from the sub-grids 112. Figure 3 As shown, the main grid 111 includes a connecting portion 13, a body segment 111a, and an extension segment 111b. The welding portion 12 includes a first welding portion 121 and a second welding portion 122. The first welding portion 121 is located at opposite ends of the body segment 111a, and the connecting portion 13 is located at opposite ends of the body segment 111a. The extension segment 111b is located on the side of the first welding portion 121 away from the body segment 111a. The body segment 111a and the extension segment 111b can be a continuous grid line 11. The connecting portion 13 includes a first connecting segment 131 and a second connecting segment 132. The first connecting segment 131 and the second connecting segment 132 are arranged along the width direction of the cell 1 and have a spacing, which can be used to form a harpoon structure at opposite ends of the main grid 111. The harpoon structure can be used to improve cell efficiency and module power. When the battery cell 1 is welded to the solder ribbon 2, at least a portion of the solder ribbon 2 is located in the area between the first connecting section 131 and the second connecting section 132. The first connecting section 131 and the second connecting section 132 can be used to position the solder ribbon 2, thereby improving the positioning accuracy of the solder ribbon 2. The second welding part 122 is connected to the extension section 111b. Along the width direction of the battery cell 1, at least a portion of the extension section 111b and at least a portion of the second welding part 122 are located between the first connecting section 131 and the second connecting section 132, that is, the extension section 111b can extend into the position where the harpoon structure is located. The first welding part 121 is fixedly connected to the solder ribbon 2, and the second welding part 122 is not fixedly connected to the solder ribbon 2, that is, the first welding part 121 is welded to the solder ribbon 2, and the second welding part 122 is not welded to the solder ribbon 2. The welding part 12 may also include a third welding part 12 (not shown in the figure), the third welding part 12 is disposed in the body section 111a, and the main grid 111 is fixedly disposed in the main body section 14 through the third welding part 12.

[0048] The scheme provided by the embodiments of the present application can extend the main grid 111 by setting the extension section 111b, thereby facilitating to improve the current collection capacity and current transmission capacity of the main grid 111, and improving the darkening of the position of the fishhook structure during EL testing. Meanwhile, during the screen printing of the grid line 11, the strength of the middle region and the edge region is difficult to be simultaneously considered due to the characteristics of the screen plate, and the strength of the edge position of the battery piece 1 can be improved by setting the extension section 111b and the second welding portion 122, thereby reducing the possibility of broken grid, and facilitating to improve the quality and power stability of the battery piece 1 and reducing the possibility of current collection abnormality. The second welding portion 122 is not connected with the solder strip 2, the step of welding the second welding portion 122 and the solder strip 2 can be omitted, the processing steps of the photovoltaic module are reduced, the processing efficiency is improved, and the cost is also reduced. Meanwhile, since the second welding portion 122 is not welded with the solder strip 2, the second welding portion 122 does not need to bear the tension of the solder strip 2, the force acting on the second welding portion 122 is small, the strength requirement of the second welding portion 122 is low, and therefore the area of the second welding portion 122 can be appropriately reduced, thereby facilitating to reduce the cost. Since the second welding portion 122 is not welded with the solder strip 2, when the position of the solder strip 2 is displaced or shaken relative to the battery piece 1, the position limitation of the second welding portion 122 on the solder strip 2 can be reduced, thereby reducing the possibility of damage of the solder strip 2.

[0049] As shown in Figure 3 in a possible implementation, along the extension direction of the main grid 111, the extension section 111b is located between the first welding portion 121 and the second welding portion 122.

[0050] By such a design, the performance of the photovoltaic module can be improved while the cost is reduced, the relative two ends of the extension section 111b are fixedly arranged on the battery piece 1 through the first welding portion 121 and the second welding portion 122 respectively, such a design can improve the stability of the extension section 111b, thereby facilitating to improve the quality of the battery piece 1.

[0051] As shown in Figure 4 in a possible implementation, along the extension direction of the main grid 111, part of the extension section 111b is located on the side of the second welding portion 122 away from the first welding portion 121.

[0052] By such a design, the extension section can be further extended to the edge position of the battery piece 1, thereby facilitating to improve the current collection capacity of the main grid 111.

[0053] As shown in Figure 3As shown, in one possible implementation, along the extending direction of the main gate 111, the distance between the first welded portion 121 and the nearest edge of the main body portion 14 is L1, and 7.5 mm ≤ L1 ≤ 11.5 mm, and / or, the distance between the second welded portion 122 and the nearest edge of the main body portion 14 is L2, and 3.5 mm ≤ L2 ≤ 8.5 mm.

[0054] The distance between the first welded portion 121 and the nearest edge of the main body portion 14 can be 7.5 mm, 8.0 mm, 8.5 mm, 9.0 mm, 9.5 mm, 10.0 mm, 10.5 mm, 11.0 mm, 11.5 mm, etc. The distance between the second welded portion 122 and the nearest edge of the main body portion 14 can be 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, 7.5 mm, 8.0 mm, 8.5 mm, etc.

[0055] With this design, the positions of the first welding part 121 and the second welding part 122 can be adjusted as needed, thereby adjusting the size of the harpoon structure, improving the quality of the grid lines 11 at the edge of the battery cell 1, reducing the possibility of grid breakage, and thus improving the problem of darkening during EL testing.

[0056] like Figure 3 As shown, in one possible implementation, the distance between the first welded portion 121 and the second welded portion 122 is L3, and 3 mm ≤ L3 ≤ 4 mm. The distance between the first welded portion 121 and the nearest second welded portion 122 can be 3.0 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4.0 mm, etc.

[0057] When the distance between the first welding part 121 and the second welding part 122 is too large, the position of the second welding part 122 is too close to the edge of the battery cell 1, requiring adjustment of the fixture structure. When the distance between the first welding part 121 and the second welding part 122 is too small, it will affect the setting of the extension section 111b. When the extension section 111b is located between the first welding part 121 and the second welding part 122, the distance between the first welding part 121 and the second welding part 122 is too short, resulting in an excessively short extension section 111b and a reduced current collection capacity. When the position of the extension section 111b exceeds the position of the second welding part 122, the second welding part 122 is too close to the first welding part 121, and the portion of the extension section 111b exceeding the position of the second welding part 122 is too long, reducing the fixing effect of the second welding part 122 on the extension section 111b, thus affecting the stability of the extension section 111b.

[0058] In a possible implementation, the number of the second welding portions 122 is , the distance between the first welding portion 121 and the nearest edge of the main body portion 14 along the extension direction of the main grid 111 is L1, and the distance between the first welding portion 121 and the nearest second welding portion 122 is L3, = (L1 / L3)-1. The distance between the first welding portion 121 and the nearest edge of the main body portion 14 is L1, the distance between the first welding portion 121 and the nearest second welding portion 122 is L3, and the intermediate quantity N is calculated, and since the number of the second welding portions 122 needs to be a positive integer, N is rounded down to obtain the number of the second welding portions 122 , and > 0.

[0059] For example, when L1=7.5 mm and L3=3.5 mm, N is calculated to be about 1.14, and N is rounded down to obtain =1, that is, when L1=7.5 mm and L3=3.5 mm, the number of the second welding portions 122 can be one. Since the opposite ends of the main grid 111 both have the connecting portions 13, one second welding portion 122 is arranged at each of the opposite ends of the main grid 111, that is, one main grid 111 can correspond to two fish-tail structures, and has two extension segments 111b, two first welding portions 121 and two second welding portions 122.

[0060] The number of the second welding portions 122 can be set according to the position of the first welding portion 121. When the distance between the first welding portion 121 and the nearest edge of the main body portion 14 is large, the size of the fish-tail structure of the battery tab 1 is large, and therefore the size of the extension segment 111b is long, and multiple second welding portions 122 can be arranged to improve the stability of the arrangement of the extension segment 111b and the current collection capacity of the main grid 111. Generally, the number of the second welding portions 122 is proportional to the distance from the position of the first welding portion 121 to the edge of the main body portion 14.

[0061] As shown in Figure 5 , in a possible implementation, the distance between the first connecting segment 131 and the second connecting segment 132 gradually increases in the direction away from the first welding portion 121.

[0062] Through such a design, the fish-tail structure can be approximately formed as a horn structure, which can improve the current collection capacity and facilitate the positioning of the welding strip 2, and is beneficial to improve the positioning accuracy of the welding strip 2 and thus improve the quality of the battery tab 1.

[0063] As shown in Figure 6As shown, in a possible implementation, the first connecting segment 131 and the second connecting segment 132 are perpendicular to the auxiliary grid 112, that is, the first connecting segment 131 and the second connecting segment 132 are arranged in parallel with the main grid 111.

[0064] By such an arrangement, the size of the first connecting segment 131 and the second connecting segment 132 can be reduced, thereby facilitating cost reduction.

[0065] As shown, in a possible implementation, the first connecting segment 131 and the second connecting segment 132 are connected with the first welding part 121, or, as shown, along the extension direction of the main grid 111, the connecting part 13 and the first welding part 121 have a spacing, and the first connecting segment 131 and the second connecting segment 132 are located on opposite sides of the second welding part 122. Figure 5 Figure 6 The specific shape of the harpoon structure can be set according to requirements. When the connecting part 13 is connected with the first welding part 121, the stability of the arrangement of the connecting part 13 can be improved, thereby improving the quality of the battery piece 1, and at the same time, the size of the formed harpoon structure is relatively large, facilitating positioning of the solder strip 2. When the connecting part 13 and the first welding part 121 have a spacing, the size of the connecting part 13 can be reduced, thereby facilitating cost reduction.

[0066] In a possible implementation, the area of the first welding part 121 is 0.6 square microns to 1.4 square microns, and / or the area of the second welding part 122 is 0.12 square microns to 0.24 square microns.

[0067] The width of the first welding part 121 can be 1.0 microns to 1.4 microns, and the length can be 0.6 microns to 1.0 microns. The width of the first welding part 121 can be 1.00 microns, 1.05 microns, 1.10 microns, 1.15 microns, 1.20 microns, 1.25 microns, 1.30 microns, 1.35 microns, 1.40 microns, etc., and the length of the first welding part 121 can be 0.60 microns, 0.65 microns, 0.70 microns, 0.75 microns, 0.80 microns, 0.85 microns, 0.90 microns, 0.95 microns, 1.00 microns, etc. The width of the second welding part 122 can be 0.4 microns to 0.8 microns, and the length can be 0.2 microns to 0.4 microns. The width of the second welding part 122 can be 0.40 microns, 0.45 microns, 0.50 microns, 0.55 microns, 0.60 microns, 0.65 microns, 0.70 microns, 0.75 microns, 0.80 microns, etc., and the length of the second welding part 122 can be 0.20 microns, 0.25 microns, 0.30 microns, 0.35 microns, 0.40 microns, etc.

[0068] The width of the first welding part 121 can be 1.0 microns to 1.4 microns, and the length can be 0.6 microns to 1.0 microns. The width of the first welding part 121 can be 1.00 microns, 1.05 microns, 1.10 microns, 1.15 microns, 1.20 microns, 1.25 microns, 1.30 microns, 1.35 microns, 1.40 microns, etc., and the length of the first welding part 121 can be 0.60 microns, 0.65 microns, 0.70 microns, 0.75 microns, 0.80 microns, 0.85 microns, 0.90 microns, 0.95 microns, 1.00 microns, etc. The width of the second welding part 122 can be 0.4 microns to 0.8 microns, and the length can be 0.2 microns to 0.4 microns. The width of the second welding part 122 can be 0.40 microns, 0.45 microns, 0.50 microns, 0.55 microns, 0.60 microns, 0.65 microns, 0.70 microns, 0.75 microns, 0.80 microns, etc., and the length of the second welding part 122 can be 0.20 microns, 0.25 microns, 0.30 microns, 0.35 microns, 0.40 microns, etc.

[0069] ​The first welding part 121 is used for welding with the solder strip 2, and can be used for bearing the tension of the solder strip 2 and other forces while playing a role of collecting current. When the area of the first welding part 121 is less than 0.6 square microns, the area of the first welding part 121 is too small, and the structural strength is low, which is easy to be damaged when bearing the tension, and affects the connection stability of the solder strip 2. When the area of the first welding part 121 is greater than 1.4 square microns, the area of the first welding part 121 is too large, which increases the cost, and the large area of the first welding part 121 affects the light receiving area of the battery piece 1, thereby affecting the efficiency of the battery piece 1. When the area of the second welding part 122 is less than 0.08 square microns, the area of the second welding part 122 is too small, which reduces the connection stability of the extension section 111b and affects the current collection efficiency of the extension part. When the area of the second welding part 122 is greater than 0.32 square microns, the area of the second welding part 122 is too large, which increases the cost. The second welding part 122 is not welded with the solder strip 2, so the force acting on the second welding part 122 is relatively small, and the structural strength requirement of the second welding part 122 is low, so the area of the second welding part 122 can be appropriately reduced, which plays a role of collecting current while reducing the cost, and also reduces the influence of the second welding part 122 on the light receiving area of the battery piece 1, which is beneficial to improve the efficiency of the battery piece 1.

[0070] As shown in Figure 3 , in a possible implementation, the first welding part 121 and the connecting part 13 can be used to form a fishing rod structure, and the second welding part 122 and the extension part are located in the range of the fishing rod structure to improve the current collection capacity.

[0071] As shown in Figure 4 , in a possible implementation, the extension section 111b can be continuously extended and exceed the position of the second welding part 122, and the second welding part 122 can be located in the middle region of the extension section 111b. Such a design is beneficial to increase the size of the extension section 111b, thereby further improving the current collection capacity of the main grid 111.

[0072] As shown in Figure 5 , in a possible implementation, the position of the second welding part 122 can be set according to requirements, and the second welding part 122 can be arranged towards the edge of the battery piece 1 to improve the quality of the grid line 11 at the edge position of the battery piece 1, reduce the possibility of grid breakage of the grid line 11 at the edge position of the battery piece 1, and improve the quality of the battery piece 1 and the EL test darkening.

[0073] As shown in Figure 6As shown, in a possible implementation, the first connecting segment 131 and the second connecting segment 132 can be perpendicular to the auxiliary grid 112, and the first connecting segment 131 and the second connecting segment 132 are spaced apart from the first welding portion 121, which can facilitate reducing the size of the connecting portion 13, thereby facilitating reducing the cost.

[0074] As shown, in a possible implementation, the first welding portion 121 can be moved to a position close to the edge of the battery piece 1, thereby reducing the distance between the first welding portion 121 and the edge of the battery piece 1, and improving the current collection capability of the main grid 111 for the edge position. Figure 7

[0075] As shown, in a possible implementation, the battery piece 1 can be provided with a plurality of second welding portions 122, and the distance between adjacent second welding portions 122 can be 3-4 mm, and the distance between adjacent first welding portions 121 can be 3.0 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4.0 mm, etc. By providing a plurality of second welding portions 122, the stability of the extension segment 111b can be improved, and the current collection capability of the extension segment 111b can be improved, thereby facilitating improving the overall efficiency of the battery and meeting the actual use requirements. Figure 8

[0076] The scheme provided in the embodiments of the present application can improve the current collection capability of the main grid 111 for the edge position of the battery piece 1 by providing the extension segment 111b and the second welding portion 122, thereby improving the efficiency of the battery piece 1. The increase of the graphic design in the fishhook structure position can facilitate reducing the problem of broken grid at the edge position of the battery piece 1, thereby improving the EL test darkening problem, and facilitating improving the stability of the product power. The scheme provided in the embodiments of the present application can be used for different battery pieces 1, including but not limited to the battery piece 1 with the main grid 111 number of 10BB, 16BB, 20BB, etc.

[0077] The above embodiments shown in the drawings detail the structure, features and effects of the present application, and the above description is only the preferred embodiments of the present application, but the present application is not limited to the drawings shown, any changes or modifications made in accordance with the concept of the present application, or the equivalent embodiments with equivalent changes, still within the scope of the present application.​​

Claims

1. A photovoltaic module, characterized by, The photovoltaic module comprises: at least two cell pieces (1); a solder strip (2) connecting adjacent cell pieces (1); wherein the cell piece (1) comprises a grid line (11), a soldering portion (12) and a main body portion (14), the grid line (11) is arranged on the main body portion (14) through the soldering portion (12), the grid line (11) comprises a main grid (111) and a sub-grid (112) intersecting, the main grid (111) comprises a connecting portion (13), a body segment (111a) and an extension segment (111b), the soldering portion (12) comprises a first soldering portion (121) and a second soldering portion (122), the first soldering portion (121) is arranged at opposite ends of the body segment (111a), the connecting portion is arranged at opposite ends of the body segment (111a), the extension segment (111b) is located on a side of the first soldering portion (121) away from the body segment (111a), the second soldering portion (122) is connected with the extension segment (111b), the connecting portion (13) comprises a first connecting segment (131) and a second connecting segment (132), the first connecting segment (131) and the second connecting segment (132) are arranged along a width direction of the cell piece (1), at least part of the connecting portion (13) is located on a side of the first soldering portion (121) away from the body segment (111a), at least part of the extension segment (111b) is located between the first connecting segment (131) and the second connecting segment (132), and at least part of the second soldering portion (122) is located between the first connecting segment (131) and the second connecting segment (132); the first soldering portion (121) is fixedly connected with the solder strip (2), and the second soldering portion (122) is not fixedly connected with the solder strip (2).

2. The photovoltaic module of claim 1, wherein, Along the extension direction of the main grid (111), the extension segment (111b) is located between the first soldering portion (121) and the second soldering portion (122).

3. The photovoltaic module of claim 1, wherein, Along the extension direction of the main grid (111), part of the extension segment (111b) is located on a side of the second soldering portion (122) away from the first soldering portion (121).

4. The photovoltaic module of claim 1, wherein, Along the extension direction of the main grid (111), the distance between the first soldering portion (121) and the edge of the nearest main body portion (14) is L1, and 7.5 mm≤L1≤11.5 mm, and / or the distance between the second soldering portion (122) and the edge of the nearest main body portion (14) is L2, and 3.5 mm≤L2≤8.5 mm.

5. The photovoltaic module of claim 1, wherein, The distance between the first soldering portion (121) and the nearest second soldering portion (122) is L3, and 3 mm≤L3≤4 mm.

6. The photovoltaic module of claim 1, wherein, The number of the second welding portions (122) located on one side of the first welding portion (121) is The distance between the first welding portion (121) and the edge of the main body portion (14) closest to the first welding portion (121) is L1, and the distance between the first welding portion (121) and the second welding portion (122) closest to the first welding portion (121) is L3, in the extension direction of the main grid (111), = (L1 / L3) - 1, >

0.

7. The photovoltaic module according to any of claims 1 to 6, characterized in that, Along the direction away from the first soldering portion (121), the distance between the first connecting segment (131) and the second connecting segment (132) gradually increases.

8. The photovoltaic module according to any of claims 1 to 6, characterized in that, The first connecting segment (131) and the second connecting segment (132) are perpendicular to the sub-grid (112).

9. The photovoltaic module according to any of claims 1 to 6, characterized in that, The first connecting section (131) and the second connecting section (132) are connected with the first welding portion (121), or, along the extension direction of the main grid (111), the connecting portion (13) and the first welding portion (121) have a spacing, and the first connecting section (131) and the second connecting section (132) are located on opposite sides of the second welding portion (122).

10. The photovoltaic module according to any of claims 1 to 6, characterized in that, The area of the first welding portion (121) is 0.6 square microns to 1.4 square microns, and / or the area of the second welding portion (122) is 0.08 square microns to 0.32 square microns.

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