A photovoltaic module

Abstract

The utility model discloses a photovoltaic module relates to photovoltaic module technical field. This photovoltaic module includes at least two photovoltaic cell series, and photovoltaic cell series includes cell piece, solder strip and busbar, and multiple cell pieces arrange in proper order, and the cell piece of adjacent cell piece is connected through solder strip, at least two photovoltaic cell series are connected through busbar, along the length direction of busbar, and the busbar includes inter -string area and intra -string area, and the inter -string area is relative to intra -string area and is set up between at least two photovoltaic cell series, and intra -string area sets up at the back of cell piece. This photovoltaic module releases the thermal stress that the busbar and solder strip produce in the welding process through the inter -string area of arching, prevents the solder strip between main grid line and cell piece warping are pulled off.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module technology, and in particular to a photovoltaic module. Background Technology

[0002] The following problems exist when welding busbars to the back of the battery cell: During the welding process of the busbar to the solder strip, thermal stress will be generated due to the thermal expansion and contraction characteristics of the busbar. Therefore, during the cooling process after welding, the busbar will shrink, causing the busbar to pull the solder strip and pull the solder strip off from the main grid line, which in turn causes the EL (Electroluminescence) in this area to turn black.

[0003] To address the technical problem of the busbar pulling the solder strip during shrinkage, a solution was proposed to arch up a portion of the busbar to form a non-welded section. However, in this solution, the busbar located between battery strings is not arched. During the cooling process after welding, the solder strip at the edge of the battery cell will still be pulled by the busbar, resulting in the solder strip between the main grid lines being pulled off or the battery cell warping. Utility Model Content

[0004] In view of this, the present invention provides a photovoltaic module to solve the technical problem that the solder strips at the edge of the cell are still pulled by the busbars, resulting in the solder strips between the main grid lines being pulled off or the cell warping.

[0005] To solve the above-mentioned technical problems, this utility model provides a photovoltaic module, including at least two photovoltaic cell strings. Each photovoltaic cell string includes cells, solder strips, and busbars. Multiple cells are arranged in sequence, and adjacent cells are connected by solder strips.

[0006] At least two photovoltaic cell strings are connected by a busbar. Along the length of the busbar, the busbar includes an inter-string region and an intra-string region. The inter-string region is arched relative to the intra-string region and is disposed between at least two photovoltaic cell strings. The intra-string region is disposed on the back side of the cell.

[0007] Optionally, the height of the inter-cell region is 0.5 to 1.2 mm along the direction perpendicular to the solar cells.

[0008] Optionally, the shape of the inter-string region can be one or more of the following:

[0009] Arc, rectangle, trapezoid, triangle, wavy, sawtooth.

[0010] Optionally, along the length of the busbar, the string region includes multiple welded portions and non-welded portions connecting two adjacent welded portions; wherein the welded portions are electrically connected to the welding strips on the back of the battery cell, and the non-welded portions are arched relative to two adjacent welded portions and disposed between two adjacent welding strips.

[0011] Optionally, a non-welded portion may be provided between any two adjacent weld strips.

[0012] Optionally, the two welded parts connected to the non-welded parts are electrically connected to any two adjacent weld strips.

[0013] Optionally, the height of the inter-serial region is greater than the height of the non-welded portion.

[0014] Optionally, the height of each non-welded portion is 0.2 to 0.8 mm along the direction perpendicular to the solar cell.

[0015] Alternatively, the non-welded portion may have one or more of the following shapes:

[0016] Arc, rectangle, trapezoid, triangle, wavy, sawtooth.

[0017] Optionally, the length of each weld is 3 to 4 mm along the length of the busbar.

[0018] The technical solution of this utility model has the following advantages or beneficial effects: Since the inter-string region is arched relative to the intra-string region and is set between at least two photovoltaic cell strings, the inter-string region can release the thermal stress generated by the busbar and the solder ribbon during the welding process. Therefore, during the cooling process after welding, the solder ribbon at the edge of the cell will not be pulled by the busbar. This not only prevents the solder ribbon between the main grid lines from being pulled off, but also prevents the cell from warping. Attached Figure Description

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

[0020] Figure 1 This is a top view of welding busbars onto multiple photovoltaic cell strings according to an embodiment of the present invention;

[0021] Figure 2a , Figure 2b , Figure 2c , Figure 2d , Figure 2e and Figure 2f This is a schematic diagram of the inter-string region of the busbar according to an embodiment of the present utility model;

[0022] Figure 3 This is a top view of a photovoltaic cell string according to an embodiment of the present utility model;

[0023] Figure 4a , Figure 4b , Figure 4c and Figure 4d This is a top view of a busbar being welded onto a photovoltaic cell string according to another embodiment of the present invention;

[0024] Figure 5 This is a top view of welding busbars onto multiple photovoltaic cell strings according to another embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of a structure for welding busbars onto multiple photovoltaic cell strings according to another embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the welding of the inner region of the busbar and the welding strip according to an embodiment of the present utility model.

[0027] The attached figures are labeled as follows:

[0028] 10-Photovoltaic cell string; 11-Solar cell; 12-Welding strip; 13-Busbar; 131-Inter-string area; 132-Intra-string area; 132a-Welded part; 132b-Non-welded part. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] The following problems exist when welding busbars to the back of solar cells: During the welding process, thermal stress is generated due to the thermal expansion and contraction characteristics of the busbars. Therefore, during the cooling process after welding, the busbars shrink, causing them to pull the solder strips and detach them from the main grid lines, resulting in blackening of the solar cells (EL) in that area. To solve the technical problem of the busbars pulling the solder strips during shrinkage, patent CN221427754U (Chinese Utility Model Patent) proposes a solar cell string and solar cell module. However, the busbars located between the cell strings are not arched. During the cooling process after welding, the solder strips at the edges of the solar cells are still pulled by the busbars, leading to the detachment of the solder strips between the main grid lines or warping of the solar cells.

[0033] Therefore, this utility model embodiment proposes to arch the busbar located between battery strings to form an inter-string area. The arched inter-string area releases the thermal stress generated by the busbar 13 and the welding strip 12 during the welding process, thereby preventing the welding strip at the edge of the battery cell from being pulled off by the busbar and the battery cell from warping.

[0034] The specific structure of the photovoltaic module provided in the embodiments of this utility model will be described in detail below.

[0035] like Figure 1 As shown, the photovoltaic module includes at least two photovoltaic cell strings 10. Each photovoltaic cell string 10 includes a cell 11, a solder ribbon 12, and a busbar 13. Multiple cells 11 are arranged sequentially, and adjacent cells 11 are connected by solder ribbons 12. Further, at least two photovoltaic cell strings 10 are connected by busbar 13. Along the length of the busbar 13, the busbar 13 includes an inter-string region 131 and an intra-string region 132. The inter-string region 131 is arched relative to the intra-string region 132 and is disposed between the at least two photovoltaic cell strings 10. The intra-string region 132 is disposed on the back side of the cell 11. Since the inter-string region 131 is arched relative to the intra-string region 132 and is located between at least two photovoltaic cell strings 10, the inter-string region 131 can release the thermal stress generated during the welding process between the busbar 13 and the solder strip 12 at the edge of the cell 11. Therefore, during the cooling process after welding, the solder strip 12 at the edge of the cell 11 will not be pulled by the busbar 13. This not only prevents the solder strip 12 at the edge of the cell 11 from being pulled off by the busbar 13, but also prevents the cell 11 from warping.

[0036] It is understandable that multiple photovoltaic cell strings 10 can be connected in parallel or in series via busbar 13. For example... Figure 1 As shown, two photovoltaic cell strings 10 are connected in parallel or in series via a busbar 13, which extends from the back of one photovoltaic cell string 10 to the back of the other. The photovoltaic modules are then manufactured by stacking, laminating, and framing the arranged photovoltaic cell strings 10.

[0037] In some embodiments of this utility model, such as Figure 2a As shown, along the direction perpendicular to the solar cell 11, the height (H1) of the inter-string region 131 is 0.5–1.2 mm. This ensures that the inter-string region 131 can release the thermal stress generated during the welding process between the busbar 13 and the solder strip 12 at the edge of the solar cell 11, thereby effectively preventing the solder strip 12 at the edge of the solar cell 11 from being pulled off by the busbar 13 and preventing the solar cell 11 from warping. If the height of the inter-string region 131 is too small, it cannot effectively release the thermal stress generated during the welding process between the busbar 13 and the solder strip 12 at the edge of the solar cell 11; if the height of the inter-string region 131 is too large, it significantly increases the material used in the busbar 13, leading to a significant increase in the production cost of the photovoltaic module. Preferably, the height of the inter-string region 131 is 0.52 mm–1.0 mm. Preferably, the height of the inter-string region 131 is 0.55 mm–0.8 mm. Preferably, the height of the inter-string region 131 is 0.58 mm–0.7 mm. For example, preferably, the height of the non-welded part 132b can be 0.54mm, 0.58mm, 0.6mm, 0.65mm, 0.8mm or 0.92mm, etc., and this embodiment of the present invention does not limit it.

[0038] Optionally, such as Figures 2a-2f As shown, the shape of the inter-string region 131 can be one or more of the following: arc, rectangle, trapezoid, triangle, wave, sawtooth. These shapes of inter-string region 131 can fully release the thermal stress generated during the welding process between the busbar 13 and the welding strip 12 at the edge of the battery cell 11, thereby effectively preventing the welding strip 12 at the edge of the battery cell 11 from being pulled off by the busbar 13 and the battery cell 11 from warping.

[0039] In some other embodiments of this utility model, an inter-string region 131 is provided between any two connected photovoltaic cell strings 10. This can more effectively prevent the solder strips 12 at the edge of the cell 11 from being pulled off by the busbar and prevent the cell 11 from warping. It should be noted that the shape of the inter-string region 131 on the busbar 13 can be the same or different, and this utility model embodiment does not limit this.

[0040] The arching of the busbar 13 located between the photovoltaic cell strings 10 to form the inter-string region 131 mainly solves the problems of the solder strip 12 at the edge of the cell 11 being pulled off by the busbar 13 and the cell 11 warping. However, in the prior art, because the non-welded part of the busbar is located above the solder strip and is spaced apart from the solder strip, some solder strips on the cell are not welded to the busbar (i.e., the busbar and solder strip are not fully welded), which leads to the risk of arcing during the subsequent use of the photovoltaic module. Moreover, since the non-welded part is spaced apart from at least one solder strip, the number of non-welded parts formed on the busbar is limited, and the thermal stress generated by the busbar and solder strip during the welding process that the non-welded part can release is also limited, which makes it impossible to effectively prevent the solder strip from being pulled due to shrinkage after the busbar is welded. Therefore, this utility model embodiment further proposes to avoid the risk of arcing during the use of the photovoltaic module by fully welding the busbar and solder strip.

[0041] like Figure 3 As shown, in a single battery string 10, multiple battery cells 11 are arranged sequentially and connected in series by solder ribbons 12 to form a photovoltaic cell string. For each battery cell 11, the front side of the battery cell 11 is soldered to the back side of a battery cell 11 on one side via solder ribbons 12, and the back side of the battery cell 11 is soldered to the front side of a battery cell 11 on the other side via solder ribbons 12, thereby forming a photovoltaic cell string 10. Figures 4a-4d As shown, for each photovoltaic cell string 10, along the length of the busbar 13, the string region 132 includes multiple welded portions 132a and non-welded portions 132b connecting two adjacent welded portions 132a. The welded portions 132a are electrically connected to the solder strips 12 on the back of the cell 11, and the non-welded portions 132b are arched relative to two adjacent welded portions 132a and positioned between at least a portion of two adjacent solder strips 12. Since the welded portions 132a are electrically connected to the solder strips 12 on the back of the cell 11, and the non-welded portions 132b are positioned between at least a portion of two adjacent solder strips 12, there is no gap between the non-welded portions 132b and the solder strips 12, thereby avoiding the risk of arcing during the subsequent use of the photovoltaic module.

[0042] It is understood that at least a portion of the welded portion 132a is planar, allowing this portion to contact and weld with the solder strip 12, thereby ensuring the welding reliability between the busbar 13 and the solder strip 12. The non-welded portion 132b is arched relative to two adjacent welded portions 132a, and is disposed between at least a portion of two adjacent solder strips 12, and is not welded to the solder strip 12. In embodiments of this invention, the welded portion 132a is welded to each solder strip 12 on the back of the battery cell 11, a process known as full welding, which effectively avoids the risk of arcing caused by intermittent welding.

[0043] When the thermal stress of the busbar 13 is not high, and the tensile force on the weld strip 12 caused by the shrinkage of the busbar 13 after welding is not large, a non-welded portion 132b can be provided only between some of the adjacent weld strips 12, such as... Figure 4a and Figure 4b As shown, the thermal stress generated during the welding process between the busbar 13 and the weld strip 12 is released through the non-welded portion 132b. Figure 4a As shown, two welding strips 12 are provided between two adjacent non-welded parts 132b, and each welded part 132a is welded to both welding strips 12. Figure 4b As shown, three welding strips 12 are provided between two adjacent non-welded parts 132b, and each welding part 132a is welded to the three welding strips 12. That is, each welding strip 12 on the battery cell 11 is welded to the busbar 13.

[0044] When the thermal stress of the busbar 13 is high, the tensile force on the weld strip 12 caused by the shrinkage of the busbar 13 after welding is also large. Therefore, a non-welded portion 132b can be provided between any two adjacent weld strips 12, such as... Figure 4c As shown, the thermal stress generated during the welding process between the busbar 13 and the welding strip 12 is fully released through the non-welded portion 132b. In this embodiment, a welding strip 12 is provided between two adjacent non-welded portions 132b, and each welding portion 132a is welded to a welding strip 12.

[0045] It should be noted that the number of welding strips 12 provided between two adjacent non-welded parts 132b in this embodiment of the invention is not limited. Only one welding strip 12 can be provided, or multiple welding strips 12 can be provided, such as two, three, four, or five, etc. The number of welding strips 12 is mainly determined by the magnitude of the thermal stress generated between the busbar 13 and the welding strips 12 during the welding process. Generally speaking, the greater the thermal stress generated between the busbar 13 and the welding strips 12 during the welding process, the fewer welding strips 12 are provided between two adjacent non-welded parts 132b; conversely, the smaller the thermal stress generated between the busbar 13 and the welding strips 12 during the welding process, the more welding strips 12 are provided between two adjacent non-welded parts 132b.

[0046] It is understood that, in the embodiments of this utility model, the magnitude of the thermal stress generated during the welding process of the busbar 13 and the welding strip 12 is relative to the welding of the busbar 13 with each welding strip 12 on the same battery cell 11.

[0047] In some embodiments of this utility model, such as Figure 4cAs shown, a non-welded portion 132b is provided between any two adjacent solder strips 12. Therefore, the busbar 13 has a sufficient number of non-welded portions 132b, which can effectively release the thermal stress generated during the welding process between the busbar 13 and the solder strips 12. Compared to the prior art technique of arching up a portion of the busbar to form a non-welded portion, the photovoltaic cell string provided in this embodiment can have more non-welded portions 132b on the busbar 13. This more effectively prevents the solder strips 12 from being pulled off the main grid lines due to the contraction of the busbar 13 after welding, thus more effectively preventing EL blackening in this area and improving process yield and the reliability of the photovoltaic module.

[0048] Optionally, such as Figure 4c As shown, the two welded portions 132a connected to the non-welded portion 132b are electrically connected to any two adjacent solder strips 12. Therefore, the photovoltaic cell string 10 can, on the one hand, fully release the thermal stress generated by the busbar 13 during the welding process, ensuring that the solder strips 12 will not be pulled off by the busbar 13 during the cooling process after welding; on the other hand, the welded portions 132a of the busbar 13 are welded to each solder strip 12 on the cell 11, which can avoid the risk of arcing when the photovoltaic module is working in the case of incomplete welding, thereby improving the reliability of the photovoltaic module.

[0049] Considering the significant tensile force exerted on the weld strips 12 at the edge of the battery cell 11 during the cooling process of the busbar 13, which could cause the battery cell 11 to warp, the number of non-welded portions 132b at the edge of the battery cell 11 can be appropriately increased. In other embodiments of this utility model, such as Figure 4d As shown, for the solder strips 12 located in the middle of the battery cell 11, non-welded portions 132b are provided only between some of the adjacent solder strips 12. That is, there are two or more solder strips 12 between two adjacent non-welded portions 132b, and each welding portion 132a is welded to two or more solder strips 12. For the solder strips 12 located at the edge of the battery cell 11, non-welded portions 132b are provided between any two adjacent solder strips 12. That is, there is only one solder strip 12 between two adjacent non-welded portions 132b, and each welding portion 132a is welded to one solder strip 12.

[0050] like Figure 5As shown, an inter-string region 131 is provided between any two connected photovoltaic cell strings 10, and a non-welded part 132b is provided between any two adjacent solder strips 12. The two solder parts 132a connected to the non-welded part 132b are electrically connected to any two adjacent solder strips 12 respectively. This can release the thermal stress generated by the busbar 13 and the solder strips 12 during the welding process to the greatest extent, thereby preventing the solder strips 12 on the cell 11 from being pulled off by the busbar 13 and the cell 11 from warping to the greatest extent. It can also effectively avoid the risk of arcing caused by intermittent welding.

[0051] In some embodiments of this utility model, not only is an inter-string region 131 provided between any two connected photovoltaic cell strings 10, but also... Figure 6 As shown in region A, furthermore, the busbar 13 located at the end of the photovoltaic module can also be provided with an inter-string region 131, such as... Figure 6 As shown in region B, this can more effectively release the thermal stress of the busbar 13, thereby preventing the solder ribbon 12 on the battery cell 11 from being pulled off by the busbar 13 and the battery cell 11 from warping.

[0052] Generally speaking, the thermal stress in the inter-string region 131 is greater than that in the intra-string region 132. In order to effectively release the thermal stress of the busbar 13, the height (H1) of the inter-string region 131 is greater than the height (H2) of the non-welded part 132b. This can not only effectively prevent the solder strip 12 on the battery cell 11 from being pulled off by the busbar 13 and the battery cell 11 from warping, but also save the material used for the busbar 13.

[0053] In some embodiments of this utility model, such as Figure 7 As shown, along the direction perpendicular to the solar cell 11, the height (H2) of each non-welded portion 132b is 0.2–0.8 mm. This ensures that the non-welded portion 132b can fully release the thermal stress generated during the welding process between the busbar 13 and the solder strip 12, thereby effectively preventing the solder strip 12 from being pulled off between the main grid lines due to the shrinkage of the busbar 13 after welding. If the height of the non-welded portion 132b is too small, the thermal stress generated during the welding process between the busbar 13 and the solder strip 12 cannot be fully released; if the height of the non-welded portion 132b is too large, the material used for the busbar 13 will be significantly increased, leading to a significant increase in the production cost of the photovoltaic cell string. Preferably, the height of the non-welded portion 132b is 0.22 mm–0.7 mm. Preferably, the height of the non-welded portion 132b is 0.28 mm–0.6 mm. Preferably, the height of the non-welded portion 132b is 0.3 mm–0.5 mm. For example, preferably, the height of the non-welded part 132b can be 0.25mm, 0.32mm, 0.4mm, 0.45mm, 0.56mm or 0.65mm, etc., and this embodiment of the present invention does not limit it.

[0054] Optionally, the non-welded portion 132b can have one or more of the following shapes: arc-shaped, rectangular, trapezoidal, triangular, wavy, or serrated. These shapes of non-welded portions 132b can effectively release the thermal stress generated during the welding process between the busbar 13 and the solder strip 12, thereby effectively preventing the solder strip 12 from being pulled off between the main grid lines due to the contraction of the busbar 13 after welding. It should be noted that the shapes of the non-welded portions 132b on the busbar 13 can be the same or different, mainly determined by the magnitude of the thermal stress generated during the welding process between the busbar 13 and the solder strip 12. Generally speaking, if the thermal stress generated during the welding process between the busbar 13 and the solder strip 12 is large, the shape of the non-welded portion 132b can be arc-shaped; if the thermal stress generated during the welding process between the busbar 13 and the solder strip 12 is small, the shape of the non-welded portion 132b can be trapezoidal or rectangular.

[0055] It should also be noted that the length of the welded portion 132a is minimized to reduce the heat-exposed area of ​​the busbar 13 and the thermal stress generated between the busbar 13 and the weld strip 12 during welding, thereby reducing the shrinkage and deformation of the busbar 13 during cooling. This not only further prevents the busbar 13 from pulling on the weld strip 12 during cooling, but also reduces the height of the non-welded portion 132b, thus saving material on the busbar 13.

[0056] In some embodiments of this utility model, such as Figure 7 As shown, along the length of the busbar 13, the length (L) of each welded portion 132a is 3-4 mm. This reduces the heat-receiving area of ​​the busbar 13, thereby reducing the thermal stress generated between the busbar 13 and the welding strip 12 during welding, and thus reducing the shrinkage deformation of the busbar 13 during cooling. If the length of the welded portion 132a is too small, the welding reliability between the welded portion 132a and the welding strip 12 cannot be guaranteed. Preferably, the length of the welded portion 132a is 3-4 mm. Preferably, the length of the welded portion 132a is 3-4 mm. Preferably, the length of the welded portion 132a is 3-4 mm. For example, preferably, the length of the welded portion 132a can be 0.25 mm, 0.32 mm, 0.4 mm, 0.45 mm, 0.56 mm, or 0.65 mm, etc., and this embodiment of the present invention does not limit this. It should be noted that the length of the welding part 132a is the length of the welding area reserved for the busbar 13, not the length of the busbar 13 and the welding strip 12.

[0057] Optionally, the busbar 13 has a thickness of 0.05–0.12 mm and a width of 4–12 mm to ensure reliable welding between the busbar 13 and the solder strip 12. Optionally, the solder strip 12 is a tin-lead solder strip with a diameter of 0.12–0.3 mm to ensure a reliable welding effect after the solder strip 12 is tinned. Optionally, the solar cell 11 is a triple-cut or quadruple-cut solar cell.

[0058] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A photovoltaic module, characterized in that, It includes at least two photovoltaic cell strings (10), each photovoltaic cell string (10) includes a cell (11), a solder strip (12) and a busbar (13), and multiple cells (11) are arranged in sequence, and adjacent cells (11) are connected by the solder strip (12); The at least two photovoltaic cell strings (10) are connected by the busbar (13). Along the length of the busbar (13), the busbar (13) includes an inter-string region (131) and an intra-string region (132). The inter-string region (131) is arched relative to the intra-string region (132) and is disposed between the at least two photovoltaic cell strings (10). The intra-string region (132) is disposed on the back side of the cell (11).

2. The photovoltaic module according to claim 1, characterized in that, Along the direction perpendicular to the battery cell (11), the height of the inter-string region (131) is 0.5 to 1.2 mm.

3. The photovoltaic module according to claim 2, characterized in that, The shape of the inter-string region (131) is one or more of the following: Arc, rectangle, trapezoid, triangle, wavy, sawtooth.

4. The photovoltaic module according to any one of claims 1-3, characterized in that, Along the length of the busbar (13), the string region (132) includes a plurality of welded portions (132a) and non-welded portions (132b) connecting two adjacent welded portions (132a); wherein the welded portions (132a) are electrically connected to the solder strips (12) on the back of the battery cell (11), and the non-welded portions (132b) are arched relative to two adjacent welded portions (132a) and disposed between two adjacent solder strips (12).

5. The photovoltaic module according to claim 4, characterized in that, The non-welded portion (132b) is provided between any two adjacent weld strips (12).

6. The photovoltaic module according to claim 5, characterized in that, The two welded parts (132a) connected to the non-welded part (132b) are electrically connected to any two adjacent weld strips (12).

7. The photovoltaic module according to claim 4, characterized in that, The height of the inter-string region (131) is greater than the height of the non-welded portion (132b).

8. The photovoltaic module according to claim 7, characterized in that, Along the direction perpendicular to the battery cell (11), the height of each of the non-welded portions (132b) is 0.2 to 0.8 mm.

9. The photovoltaic module according to claim 4, characterized in that, The non-welded portion (132b) has one or more of the following shapes: Arc, rectangle, trapezoid, triangle, wavy, sawtooth.

10. The photovoltaic module according to claim 4, characterized in that, Along the length direction of the busbar (13), the length of each welded portion (132a) is 3 to 4 mm.

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