Photovoltaic module and method for manufacturing photovoltaic module

Abstract

The invention relates to a photovoltaic module and a manufacturing method of the photovoltaic module. The photovoltaic module comprises a battery string and a solder strip, the battery string comprises a plurality of battery pieces, and each battery piece comprises a battery piece main body, a plurality of first grid lines and a plurality of bonding pad groups. The plurality of first grid lines are arranged on the target surface of the battery piece body at intervals, and the bonding pad groups are arranged on the first grid lines in a one-to-one correspondence mode. The welding strips and the bonding pad groups are arranged in a one-to-one correspondence manner, and the bonding pad groups of two adjacent battery pieces are electrically connected through the corresponding welding strips; each first grid line comprises two end portions, and the two end portions are located on the two opposite sides of the corresponding bonding pad set in the extending direction of the first grid line. Defining the end part, closer to the other battery piece, of the two end parts of one battery piece in the two adjacent battery pieces as a target end part; and along the thickness direction of the battery piece main body, the welding strips and the target end parts of the corresponding first grid lines are arranged at intervals. And the fragment rate of the photovoltaic module can be reduced, so that the yield of the photovoltaic module can be improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic module and a method for manufacturing the photovoltaic module. Background Art

[0002] A photovoltaic module usually includes a plurality of cells and welding strips. Two adjacent cells are electrically connected via the welding strips. In this way, a plurality of cells can be connected to form a cell string.

[0003] However, the yield rate of photovoltaic modules in the related art is low. Summary of the invention

[0004] Based on this, it is necessary to provide a photovoltaic module and a method for manufacturing a photovoltaic module in response to the above technical problems, which can reduce the breakage rate of the photovoltaic module and thereby improve the yield of the photovoltaic module.

[0005] According to the first aspect of the present application, a photovoltaic module is provided, including a battery string and a welding strip, wherein the battery string includes a plurality of battery cells, and the battery cell includes a battery cell body, a plurality of first grid lines and a plurality of pad groups. Along the thickness direction of the battery cell body, the battery cell body has a first surface and a second surface arranged opposite to each other; at least one of the first surface and the second surface is defined as a target surface. A plurality of first grid lines are arranged at intervals on the target surface of the battery cell body, and the pad groups are arranged on the first grid lines in a one-to-one correspondence. The welding strip is arranged in a one-to-one correspondence with the pad groups, and the pad groups of two adjacent battery cells are electrically connected through the corresponding welding strip; wherein the first grid line includes two ends, and along the extension direction of the first grid line, the two ends are located on opposite sides of the corresponding pad group; the end of the two ends of one of the two adjacent battery cells that is closer to the other battery cell is defined as the target end; along the thickness direction of the battery cell body, the welding strip is arranged at intervals with the target end of the corresponding first grid line.

[0006] In one of the embodiments, along the thickness direction of the battery cell body, the spacing between the welding strip and the corresponding target end of the first grid line is 10µm-500µm.

[0007] In one of the embodiments, along the direction from one of the two adjacent battery slices to the other battery slice, the size of the target end is 3 mm-10 mm.

[0008] In one of the embodiments, the photovoltaic module further includes a spacer layer; the target surface of at least one of the two adjacent cells is provided with the spacer layer covering the target end; the cell provided with the spacer layer among the two adjacent cells is defined as a target cell, and a portion of the welding strip is located on a side of the spacer layer away from the target cell.

[0009] In one embodiment, the thickness of the spacer layer is 10µm-500µm; and / or

[0010] Along the direction in which one of the two adjacent battery cells points to the other battery cell, the size of the spacing layer is 3 mm-10 mm.

[0011] In one of the embodiments, each of the pad groups includes a plurality of pads spaced apart along the extension direction of the first gate line; along the direction in which one of the two adjacent battery cells points toward the other battery cell, the spacer layer is spaced apart from the adjacent pads, and the spacing between the spacer layer and the adjacent pads is L, wherein 0mm<L≤2mm.

[0012] In one embodiment, the material of the spacing layer includes insulating material; and / or

[0013] The spacer layer is elastic.

[0014] In one of the embodiments, each of the pad groups includes a plurality of pads spaced apart along the extension direction of the first gate line; along the direction in which one of the two adjacent battery cells points to the other battery cell, the battery cell has two edge portions arranged opposite to each other; along the direction in which one of the two adjacent battery cells points to the other battery cell, the spacing between the edge portion and the adjacent pad is 2mm-12mm.

[0015] According to a second aspect of the present application, a method for manufacturing a photovoltaic module is provided, comprising: providing a battery string, the battery string comprising a plurality of battery cells; the battery cell comprising a battery cell body, a plurality of first grid lines and a plurality of pad groups; along the thickness direction of the battery cell body, the battery cell body having a first surface and a second surface arranged opposite to each other; defining at least one of the first surface and the second surface as a target surface; a plurality of first grid lines are arranged at intervals on the target surface of the battery cell body; pad groups are arranged one by one on the first grid line; the first grid line comprises two ends, and along the extension direction of the first grid line, the two ends are located on opposite sides of the corresponding pad group; defining the end of the two ends of one of the two adjacent battery cells that is closer to the other battery cell as the target end; electrically connecting the pad groups of the two adjacent battery cells through corresponding welding strips, and spacing the welding strips and the corresponding target ends of the first grid line along the thickness direction of the battery cell body.

[0016] In one of the embodiments, before electrically connecting the pad groups of two adjacent battery cells through the corresponding welding strips and spacing the welding strips and the corresponding target ends of the first grid lines along the thickness direction of the battery cell body, the method further includes: forming a spacing layer covering the target end on the target surface of at least one of the two adjacent battery cells.

[0017] In the technical solution of the present application, by setting the welding strip and the target end of the corresponding first grid line at a distance, it is helpful to reduce the risk of welding the welding strip to the target end of the corresponding first grid line, and further help reduce the risk of the welding strip being welded at the position corresponding to the target end, and further help increase the free margin of the welding strip at the connection between two adjacent battery cells, and further help reduce the occurrence of increased risk of fragmentation due to the welding strip being welded at the edge of the grid line, which is helpful to reduce the breakage rate of the photovoltaic module to a certain extent, and further help improve the yield of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a battery cell in an embodiment of the present application is shown.

[0019] Figure 2 A schematic structural diagram of a photovoltaic module in an embodiment of the present application is shown.

[0020] Figure 3 A schematic diagram of the partial structure of a battery cell, a welding strip and a spacer layer according to an embodiment of the present application is shown.

[0021] Figure numerals: 100, battery cell; 110, battery cell body; 101, edge portion; 120, first grid line; 121, end portion; 130, pad group; 131, pad; 140, edge grid line; 150, second grid line; 200, welding strip; 300, spacer layer. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0023] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0024] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0026] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0028] A photovoltaic module usually includes a plurality of cells and welding strips. Two adjacent cells are electrically connected via the welding strips. In this way, a plurality of cells can be connected to form a cell string.

[0029] However, the welding strips of the photovoltaic modules in the related art are easily welded at the edges of the grid lines of the battery cells, resulting in a high breakage rate of the photovoltaic modules, and further resulting in a low yield rate of the photovoltaic modules in the related art.

[0030] In order to solve the above technical problems, the present application designs a photovoltaic module, which can reduce the occurrence of welding strips at the edge of the first grid line of the battery cell, thereby reducing the breakage rate of the photovoltaic module and improving the yield of the photovoltaic module.

[0031] Figure 1 A schematic diagram of the structure of a battery cell in an embodiment of the present application is shown. Figure 2 FIG. 1 shows a schematic diagram of the structure of a photovoltaic module in an embodiment of the present application. Figure 3 A schematic diagram of the partial structure of a battery cell, a welding strip and a spacer layer according to an embodiment of the present application is shown.

[0032] Please refer to Figure 1-Figure 3An embodiment of the present application provides a photovoltaic module, including a battery string and a welding ribbon 200, wherein the battery string includes a plurality of battery cells 100, and the battery cell 100 includes a battery cell body 110, a plurality of first grid lines 120, and a plurality of welding pad groups 130. Along the thickness direction of the battery cell body 110, the battery cell body 110 has a first surface and a second surface disposed opposite to each other, and at least one of the first surface and the second surface is defined as a target surface. The first surface may be the target surface; the second surface may be the target surface; or both the first surface and the second surface may be the target surface.

[0033] A plurality of first grid lines 120 are arranged at intervals on the target surface of the battery cell body 110, and the pad groups 130 are arranged one-to-one on the first grid lines 120. The welding strips 200 and the welding pad groups 130 are arranged one-to-one correspondingly, and the welding pad groups 130 of two adjacent battery cells 100 are electrically connected through the corresponding welding strips 200.

[0034] Each pad group 130 includes a plurality of pads 131 arranged at intervals along the extending direction of the first gate line 120 .

[0035] The first grid line 120 can be extended longitudinally along the length direction L of the battery cell body 110, and the first grid line 120 can also be extended longitudinally along the width direction W of the battery cell body 110, without specific limitation herein, wherein the length direction L of the battery cell body 110, the width direction W of the battery cell body 110 and the thickness direction D of the battery cell body 110 are perpendicular to each other.

[0036] “The pad groups 130 of two adjacent battery cells 100 are electrically connected through corresponding welding strips 200” means that: in two adjacent battery cells 100, at least part of the pads 131 of the pad group 130 of one battery cell 100 is electrically connected to the corresponding welding strip 200, and at least part of the pads 131 of the pad group 130 of the other battery cell 100 is electrically connected to the corresponding welding strip 200. It can be that part of the pads 131 of the pad group 130 of one of the two adjacent battery cells 100 is electrically connected to the corresponding welding strip 200. It can also be that all the pads 131 of the pad group 130 of one of the two adjacent battery cells 100 is electrically connected to the corresponding welding strip 200. No specific limitation is made here.

[0037] Since the pad groups 130 of two adjacent battery cells 100 are electrically connected via the corresponding welding ribbons 200 , the two adjacent battery cells 100 can be connected in series via the corresponding welding ribbons 200 . In this way, a plurality of battery cells 100 can be connected in series to form a battery string.

[0038] In addition, since the plurality of first gate lines 120 are arranged at intervals and the first gate lines 120 extend longitudinally along the length direction L of the battery cell body 110 or the width direction W of the battery cell body 110, the first gate lines 120 are not arranged into a harpoon structure, and it is also possible to avoid the situation where the end 121 of the first gate line 120 is too thick (the harpoon structure will cause the thickness to be too high), thereby reducing the probability of fragmentation.

[0039] The first grid line 120 includes two ends 121, and along the extension direction of the first grid line 120, the two ends 121 are located at opposite sides of the corresponding pad group 130. The end 121 of one of the two ends 121 of the two adjacent battery cells 100 that is closer to the other battery cell 100 is defined as the target end, and along the thickness direction of the battery cell body 110, the welding strip 200 is spaced apart from the target end of the corresponding first grid line 120.

[0040] It can be that before the pad group 130 is welded to the corresponding welding strip 200, the welding strip 200 and the target end of the corresponding first gate line 120 are spaced apart by a temporary component temporarily arranged at the target end, and the temporary component is removed after welding is completed; it can also be that before the pad group 130 is welded to the corresponding welding strip 200, the welding strip 200 and the target end of the corresponding first gate line 120 are spaced apart by a component arranged at the target end (such as the spacing layer 300 described below), and the spacing layer 300 is still retained after welding is completed. Of course, the welding strip 200 and the target end of the corresponding first gate line 120 can also be spaced apart by other methods, which are not specifically limited here.

[0041] By setting the welding ribbon 200 and the target end of the corresponding first grid line 120 at intervals, it is helpful to reduce the risk of welding the welding ribbon 200 to the target end of the corresponding first grid line 120, and further help to reduce the risk of the welding ribbon 200 being welded at the position corresponding to the target end, and further help to increase the movable margin of the welding ribbon 200 at the connection between two adjacent battery cells 100, and further help to reduce the occurrence of increased risk of fragmentation due to the welding ribbon 200 being welded at the edge of the first grid line 120 (if the welding ribbon 200 is welded at the edge of the first grid line 120, it will cause the thickness of the edge of the battery cell 100 to be too high, and further lead to increased risk of fragmentation), which is helpful to reduce the breakage rate of the photovoltaic module to a certain extent, and further can improve the yield of the photovoltaic module.

[0042] In some embodiments, along the thickness direction of the battery cell body 110 , the spacing between the welding ribbon 200 and the target end of the corresponding first grid line 120 is 10 μm-500 μm.

[0043] For example, along the thickness direction of the battery cell body 110 , the spacing between the welding ribbon 200 and the target end of the corresponding first grid line 120 is 10µm, 100µm, 200µm, 300µm, 400µm or 500µm.

[0044] If the spacing between the welding ribbon 200 and the target end of the corresponding first grid line 120 along the thickness direction of the battery cell body 110 is too small, the risk of the welding ribbon 200 being welded at the position corresponding to the target end will increase; if the spacing between the welding ribbon 200 and the target end of the corresponding first grid line 120 along the thickness direction of the battery cell body 110 is too large, the thickness at the edge of the battery cell 100 will be too large, which will easily lead to an increased risk of fragmentation; for this reason, along the thickness direction of the battery cell body 110, the spacing between the welding ribbon 200 and the target end of the corresponding first grid line 120 is set within an appropriate range, that is, set to 10µm-500µm, so that the risk of the welding ribbon 200 being welded at the position corresponding to the target end can be reduced, and the thickness at the edge of the battery cell 100 can be controlled within a suitable range, thereby reducing the risk of fragmentation and improving the yield of the photovoltaic module.

[0045] In some embodiments, along the direction from one of the two adjacent battery cells 100 to the other battery cell 100 , the size of the target end portion is 3 mm-10 mm.

[0046] Along the direction from one of the two adjacent battery cells 100 to the other battery cell 100 , the size of the target end is the width of the target end.

[0047] Illustratively, the width of the target end is 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm.

[0048] If the width of the target end is too small, the risk of the soldering tape 200 being soldered at the position corresponding to the target end will increase; if the width of the target end is too large, the distribution of the multiple soldering pads 131 of the soldering pad group 130 will be too dense, thereby increasing the difficulty of the welding process between the soldering pad group 130 and the soldering tape 200; for this reason, it is necessary to set the width of the target end within an appropriate range, such as 3mm-10mm, so as to reduce the risk of the soldering tape 200 being soldered at the position corresponding to the target end, and facilitate the welding of the multiple soldering pads 131 of the soldering pad group 130 with the corresponding soldering tape 200.

[0049] In some embodiments, the photovoltaic module further includes a spacer layer 300, and a spacer layer 300 covering a target end is provided on a target surface of at least one of the two adjacent cells 100. The cell 100 provided with the spacer layer 300 among the two adjacent cells 100 is defined as a target cell, and a portion of the welding ribbon 200 is located on a side of the spacer layer 300 away from the target cell.

[0050] It can be understood that along the direction parallel to one of the two adjacent battery cells 100 pointing to the other battery cell 100 , the spacer layer 300 is located on the side of the pad group 130 on the target battery cell close to the other battery cell 100 of the two adjacent battery cells 100 .

[0051] By utilizing the spacer layer 300, the welding ribbon 200 can be well spaced apart from the target end of the corresponding first grid line 120, thereby reducing the risk of increased fragmentation caused by the welding ribbon 200 being welded at the edge of the first grid line 120, which is beneficial to reducing the breakage rate of the photovoltaic module to a certain extent, thereby improving the yield of the photovoltaic module.

[0052] In some embodiments, the thickness of the spacer layer 300 is 10 μm-500 μm.

[0053] Illustratively, the thickness of the spacer layer 300 is 10 µm, 50 µm, 100 µm, 200 µm, 300 µm, 400 µm or 500 µm.

[0054] If the thickness of the spacer layer 300 is too thin, the difficulty of the manufacturing process of the spacer layer 300 will increase; if the thickness of the spacer layer 300 is too thick, the thickness at the edge of the battery cell 100 will be too large, which will easily lead to an increased risk of fragmentation; for this reason, the thickness of the spacer layer 300 needs to be set within an appropriate range, that is, the thickness of the spacer layer 300 is set to 10µm-500µm. In this way, the risk of the welding ribbon 200 being welded at the position corresponding to the target end can be reduced, and the thickness at the edge of the battery cell 100 can be controlled within a suitable range, thereby reducing the risk of fragmentation and improving the yield of the photovoltaic module.

[0055] In some embodiments, in some embodiments, along the direction from one of the two adjacent battery cells 100 to the other battery cell 100 , the size of the spacer layer 300 is 3 mm-10 mm.

[0056] Along the direction from one of the two adjacent battery cells 100 to the other battery cell 100 , the size of the spacer layer 300 is the width of the spacer layer 300 .

[0057] Illustratively, the width of the spacer layer 300 is 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm.

[0058] If the width of the spacer layer 300 is too narrow, the risk of the welding tape 200 being welded at the edge of the first grid line 120 will increase; if the width of the spacer layer 300 is too wide, it will easily cause the spacer layer 300 to cover the pad group 130, thereby increasing the probability of the outermost welding pad 131 in the pad group 130 being desoldered; for this reason, it is necessary to set the width of the spacer layer 300 within a suitable range, such as setting the width of the spacer layer 300 to 3mm-10mm. In this way, the risk of the welding tape 200 being welded at the edge of the first grid line 120 can be reduced, thereby reducing the risk of breakage, and helping the welding pad 131 of the pad group 130 to be firmly welded to the corresponding welding tape 200, thereby improving the yield of the photovoltaic module.

[0059] In some embodiments, along the direction from one of the two adjacent battery cells 100 to the other battery cell 100 , the spacer layer 300 is spaced apart from the adjacent pad 131 , and the spacing between the spacer layer 300 and the adjacent pad 131 is L, where 0mm<L≤2mm.

[0060] For example, the distance between the spacer layer 300 and the adjacent pad 131 is 0.1 mm, 0.5 mm, 1 mm or 2 mm.

[0061] If the spacing between the spacer layer 300 and the adjacent pad 131 is too small, for example, when the spacing between the spacer layer 300 and the adjacent pad 131 is zero, it is easy to increase the probability of the outermost pad 131 in the pad group 130 being desoldered; if the spacing between the spacer layer 300 and the adjacent pad 131 is too large, it will increase the risk of the soldering ribbon 200 being soldered at the edge of the first gate line 120;

[0062] To this end, it is necessary to set the spacing between the spacer layer 300 and the adjacent soldering pad 131 within a suitable range, such as within the range of "0mm<L≤2mm". In this way, the risk of the soldering strip 200 being soldered at the edge of the first grid line 120 can be greatly reduced, thereby reducing the risk of breakage, and helping the soldering pad 131 of the soldering pad group 130 to be firmly soldered to the corresponding soldering strip 200, thereby improving the yield of the photovoltaic module.

[0063] Optionally, along the direction from one of the two adjacent battery cells 100 to the other battery cell 100 , a side of the spacer layer 300 away from the adjacent solder pad 131 is arranged flush with the edge portion 101 of the battery cell 100 .

[0064] In some embodiments, the material of the spacer layer 300 includes insulating material.

[0065] In this way, the probability of the welding ribbon 200 being welded on the spacer layer 300 can be reduced, thereby improving the reliability and yield of the photovoltaic module.

[0066] In some embodiments, the spacer layer 300 is elastic.

[0067] The elastic spacer layer 300 can be used to improve the impact resistance of the battery cell 100, thereby reducing the risk of the battery cell 100 being broken, and thus improving the yield of the photovoltaic module.

[0068] In some embodiments, the material of the spacer layer 300 includes insulating material, and the spacer layer 300 is elastic.

[0069] For example, the material of the spacer layer 300 is one or more of ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE), polyethylene foam (EPE), polyvinyl butyral (PVB), polyethylene terephthalate (PET), polyvinyl chloride (PVC), thermoplastic polyurethane elastomer (TPU), polycarbonate (PC), and polyvinylidene fluoride (PVDF).

[0070] In some embodiments, each pad group 130 includes a plurality of pads 131 spaced apart along the extension direction of the first grid line 120. In the direction in which one of the two adjacent battery cells 100 points to the other battery cell 100, the battery cell 100 has two edge portions 101 disposed opposite to each other. In the direction in which one of the two adjacent battery cells 100 points to the other battery cell 100, the spacing between the edge portion 101 and the adjacent pad 131 is 2 mm-12 mm.

[0071] For example, along the direction from one of the two adjacent battery cells 100 to the other battery cell 100 , the distance between the edge portion 101 and the adjacent pad 131 is 2 mm, 4 mm, 6 mm, 8 mm, 10 mm or 12 mm.

[0072] If the spacing between the edge portion 101 and the adjacent soldering pad 131 is too narrow, the target end portion located outside the soldering pad group 130 will be too narrow, thereby causing the risk of the soldering ribbon 200 being soldered at the edge of the first grid line 120; if the spacing between the edge portion 101 and the adjacent soldering pad 131 is too wide, the activity of the soldering ribbon 200 will be too high, thereby increasing the risk of desoldering; for this reason, it is necessary to set the spacing between the edge portion 101 and the adjacent soldering pad 131 within an appropriate range, such as 2mm-12mm. In this way, the risk of the soldering ribbon 200 being soldered at the edge of the first grid line 120 can be greatly reduced, thereby reducing the risk of breakage, and helping the soldering pads 131 of the soldering pad group 130 to be firmly soldered to the corresponding soldering ribbon 200, thereby improving the yield of the photovoltaic module.

[0073] In some embodiments, the cell 100 further includes two edge grid lines 140 and a plurality of second grid lines 150 disposed on the target surface, wherein one edge grid line 140 is electrically connected to one end of all first grid lines 120 on the target surface, and the other edge grid line 140 is electrically connected to the other end of all first grid lines 120 on the target surface. The plurality of first grid lines 120 are arranged at intervals along one of the length direction L of the cell 100 and the width direction W of the cell 100, and the plurality of second grid lines 150 are arranged at intervals along the other of the length direction L of the cell 100 and the width direction W of the cell 100. The second grid lines 150 are electrically connected to the first grid lines 120, and the second grid lines 150 are electrically connected to the cell body 110.

[0074] It can be understood that the first grid line 120 can be electrically connected to the battery cell body 110 .

[0075] For example, the plurality of first gate lines 120 are arranged at intervals along the length direction L of the battery cell 100 , and the plurality of second gate lines 150 are arranged at intervals along the width direction W of the battery cell 100 .

[0076] The edge grid lines 140 and the first grid lines 120 are both main grids, and the second grid lines 150 are auxiliary grids. During the operation of the photovoltaic module, the current generated by the photovoltaic effect can be collected by multiple second grid lines 150, and then the current collected by multiple second grid lines 150 can be collected by multiple first grid lines 120, and the multiple first grid lines 120 then export the collected current.

[0077] The cell 100 of the photovoltaic module may be a back contact cell (BC), a tunneling oxide passivated contact solar cell (TOPCon), a passivated emitter and rear cell (PERC), or an intrinsic thin film heterojunction cell (HJT).

[0078] The grid lines of a tunnel oxide passivated contact solar cell (TOPCon), a passivated emitter and rear cell (PERC), or an intrinsic thin film heterojunction cell (HJT) may include the first grid line 120 , the edge grid line 140 , and the second grid line 150 described above. In other embodiments, if the cell 100 of the photovoltaic module is an example of a back-contact cell, that is, the photovoltaic module is a back-contact photovoltaic module, the first surface of the cell 100 is the front side, the second surface of the cell 100 is the back side, and a plurality of first grid lines 120 and a plurality of second grid lines 150 (not shown in the figure) are provided on the back side of the cell 100, the first grid lines 120 are main grids, the second grid lines 150 are auxiliary grids, the plurality of first grid lines 120 on the back side of the cell 100 include a plurality of first sub-grid lines and a plurality of second sub-grid lines that are alternately arranged, the first sub-grid lines and the second sub-grid lines both have two ends 121, the plurality of second grid lines 150 on the back side of the cell 100 include a plurality of third sub-grid lines and a plurality of fourth sub-grid lines that are arranged at intervals, the first sub-grid lines and the third sub-grid lines are arranged perpendicular to each other and are perpendicular to the back side, each first sub-grid line is electrically connected to a plurality of adjacent third sub-grid lines, so that all the first sub-grid lines are used to collect the current collected by all the third sub-grid lines. The second sub-grid line and the fourth sub-grid line are arranged perpendicular to each other and perpendicular to the back surface. Each second sub-grid line is electrically connected to a plurality of adjacent fourth sub-grid lines, so that all the second sub-grid lines are used to collect the current collected by all the fourth sub-grid lines. The plurality of welding strips 200 include a first welding strip corresponding to the first sub-grid line and a second welding strip corresponding to the second sub-grid line. In this way, along the thickness direction of the battery cell body 110, the first welding strip is spaced apart from the target end of the corresponding first sub-grid line, and the second welding strip is spaced apart from the target end of the corresponding second sub-grid line.

[0079] An embodiment of the present application further provides a method for manufacturing a photovoltaic module, comprising the following steps:

[0080] S11, providing a battery string, the battery string includes a plurality of battery cells 100; the battery cell 100 includes a battery cell body 110, a plurality of first grid lines 120 and a plurality of pad groups 130; along the thickness direction of the battery cell body 110, the battery cell body 110 has a first surface and a second surface disposed opposite to each other, and at least one of the first surface and the second surface is defined as a target surface. A plurality of first grid lines 120 are arranged on the target surface of the battery cell body 110 at intervals, and the pad groups 130 are arranged on the first grid lines 120 in a one-to-one correspondence. The first grid line 120 includes two end portions 121, and along the extension direction of the first grid line 120, the two end portions 121 are located on opposite sides of the corresponding pad group 130.

[0081] S20 , electrically connecting the pad groups 130 of two adjacent battery cells 100 through the corresponding welding ribbons 200 , and spacing the welding ribbons 200 and the target ends of the corresponding first grid lines 120 along the thickness direction of the battery cell body 110 .

[0082] In this way, the risk of the welding ribbon 200 being welded at the position corresponding to the target end can be reduced, thereby increasing the movable margin of the welding ribbon 200 at the connection between two adjacent battery cells 100, thereby helping to reduce the risk of increased fragmentation caused by the welding ribbon 200 being welded at the edge of the first grid line 120, which is helpful to reduce the breakage rate of the photovoltaic module to a certain extent, thereby improving the yield of the photovoltaic module.

[0083] Optionally, before step S20, the method for manufacturing a photovoltaic module further includes:

[0084] S12, forming a spacer layer 300 covering a target end portion on a target surface of at least one of two adjacent battery cells 100.

[0085] By utilizing the spacer layer 300, the welding ribbon 200 can be well spaced apart from the target end of the corresponding first grid line 120, thereby reducing the risk of increased fragmentation caused by the welding ribbon 200 being welded at the edge of the first grid line 120, which is beneficial to reducing the breakage rate of the photovoltaic module to a certain extent, thereby improving the yield of the photovoltaic module.

[0086] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A photovoltaic module, characterized in that: include: A battery string, including a plurality of battery cells; The battery cell comprises: A battery cell body, wherein along a thickness direction of the battery cell body, the battery cell body has a first surface and a second surface disposed opposite to each other; at least one of the first surface and the second surface is defined as a target surface; A plurality of first grid lines are arranged at intervals on the target surface of the battery cell body; and A plurality of pad groups, each of which is arranged on the first gate line in a one-to-one correspondence; and Welding strips are arranged in one-to-one correspondence with the welding pad groups, and the welding pad groups of two adjacent battery cells are electrically connected through the corresponding welding strips; Wherein, the first gate line comprises two ends, and along the extension direction of the first gate line, the two ends are located at opposite sides of the corresponding pad group; defining the end of the two ends of one of the two adjacent battery slices, which is closer to the other battery slice, as a target end; Along the thickness direction of the battery cell body, the welding strip is spaced apart from the target end of the corresponding first grid line.

2. The photovoltaic module according to claim 1, characterized in that: Along the thickness direction of the battery cell body, the spacing between the welding strip and the corresponding target end of the first grid line is 10µm-500µm.

3. The photovoltaic module according to claim 1, characterized in that: Along the direction from one of the two adjacent battery slices to the other battery slice, the size of the target end is 3 mm-10 mm.

4. The photovoltaic module according to claim 1, characterized in that: The photovoltaic module also includes a spacing layer; The target surface of at least one of the two adjacent battery cells is provided with the spacer layer covering the target end; The cell provided with the spacer layer in two adjacent cell sheets is defined as a target cell sheet, and a portion of the welding strip is located on a side of the spacer layer facing away from the target cell sheet.

5. The photovoltaic module according to claim 4, characterized in that: The thickness of the spacer layer is 10µm-500µm; and / or Along the direction in which one of the two adjacent battery cells points to the other battery cell, the size of the spacing layer is 3 mm-10 mm.

6. The photovoltaic module according to claim 4, characterized in that: Each of the pad groups includes a plurality of pads spaced apart along the extending direction of the first gate line; Along the direction from one of the two adjacent battery cells to the other battery cell, the spacer layer is spaced apart from the adjacent pads, and the spacing between the spacer layer and the adjacent pads is L, wherein 0mm<L≤2mm.

7. The photovoltaic module according to claim 4, characterized in that: The material of the spacing layer includes insulating material; and / or The spacer layer is elastic.

8. The photovoltaic module according to any one of claims 1 to 7, characterized in that: Each of the pad groups includes a plurality of pads spaced apart along the extending direction of the first gate line; Along the direction in which one of the two adjacent battery slices points to the other battery slice, the battery slice has two edge portions that are arranged oppositely; Along the direction in which one of the two adjacent battery cells points to the other battery cell, the distance between the edge portion and the adjacent welding pad is 2 mm-12 mm.

9. A method for manufacturing a photovoltaic module, characterized in that: include: Providing a battery string, the battery string comprising a plurality of battery cells; The battery cell comprises a battery cell body, a plurality of first grid lines and a plurality of pad groups; Along the thickness direction of the battery cell body, the battery cell body has a first surface and a second surface that are arranged opposite to each other; at least one of the first surface and the second surface is defined as a target surface; a plurality of first grid lines are arranged on the target surface of the battery cell body at intervals; pad groups are arranged on the first grid lines in a one-to-one correspondence; the first grid line includes two ends, and along the extension direction of the first grid line, the two ends are located on opposite sides of the corresponding pad group; the end of one of the two ends of the battery cell in two adjacent battery cells that is closer to the other battery cell is defined as a target end; The pad groups of two adjacent battery cells are electrically connected through corresponding welding strips, and the welding strips and the corresponding target ends of the first grid lines are spaced apart along the thickness direction of the battery cell body.

10. The method for manufacturing a photovoltaic module according to claim 9, characterized in that: Before the pad groups of two adjacent battery cells are electrically connected through the corresponding welding strips, and the welding strips and the corresponding target ends of the first grid lines are spaced apart along the thickness direction of the battery cell body, the method further includes: A spacer layer covering the target end is formed on the target surface of at least one of the two adjacent battery cells.

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