Photovoltaic power station, photovoltaic module and bus bar

Abstract

The utility model relates to a photovoltaic power station, a photovoltaic module and a bus bar. The first connecting part arranged corresponding to the outline position of the lead-out hole is connected in series between the current collecting section and the lead-out section, and the first connecting part comprises the linear section which is obliquely arranged towards one side, deviating from the second adhesive film layer, of the current collecting section and / or the curved section which is bent. Therefore, the distance between the first connecting part and the position opposite to the outline of the lead-out hole is larger than the distance between the current collecting section and the second adhesive film layer, so that the lamination pressure on the bus bar and the position opposite to the outline of the lead-out hole can be reduced in the lamination process, and the lamination pressure and the lamination pressure on other parts on the bus bar are mutually balanced; excessive pressure at the local position of the bus bar is avoided, so that bubbles at the position, right opposite to the outline of the lead-out hole, on the bus bar can be smoothly discharged, and the whitening defect is avoided; in addition, production is more convenient, the machining difficulty is reduced, and the production efficiency is higher.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to photovoltaic power stations, photovoltaic modules and busbars. Background Art

[0002] A photovoltaic module is a device that achieves photoelectric conversion and typically includes a cover plate, a first film layer, a cell layer, a second film layer, a backplane, and a junction box, stacked in sequence. The cell layer includes multiple cells and solder ribbons electrically connected to the cells. The solder ribbons are used to connect the multiple cells in series to form a cell string. The cell layer also includes busbars, each connected to the multiple solder ribbons. These busbars are typically bent to form lead-out sections. Lead-out holes corresponding to the positions of the lead-out sections are formed on the second film layer and the backplane. The lead-out sections extend outward through the lead-out holes and are electrically connected to the junction box. The busbars then direct the current from the multiple cell strings to the junction box.

[0003] To meet the appearance requirements, the busbar is usually set to a black busbar, such as Figure 1 As shown, the black bus bar 110 is a conventional bus bar formed by electroplating, coating or chemically depositing a layer of black material. However, the lead wire area of ​​the black bus bar 110 is affected by bending stress and is prone to wrinkling or cracking after lamination, resulting in defects such as white appearance. Figure 1 and Figure 2 In the related art, a black shielding member 120 is usually added to the bend area of ​​the black busbar 110 to solve the problem of the busbar turning white after lamination. However, the provision of the black shielding member 120 increases production costs and wastes human resources, thus affecting production efficiency. Summary of the Invention

[0004] Based on this, it is necessary to overcome the defects of the existing technology and provide a photovoltaic power station, photovoltaic module and bus bar, which can prevent the appearance of whitening defects, while having low material costs and high production efficiency.

[0005] A busbar is provided between a first adhesive film layer and a second adhesive film layer, and extends outward from an outlet hole of the second adhesive film layer to be connected to a junction box. The busbar comprises:

[0006] A current collecting section, the current collecting section being used to be connected to at least one welding strip of the battery layer;

[0007] an outlet section, the outlet section being used to be connected to the junction box; and

[0008] A first connecting portion, the first connecting portion is connected in series between the current collecting section and the lead-out section, the first connecting portion is arranged corresponding to the contour position of the lead-out hole, and the first connecting portion includes a straight line segment and / or a curved curve segment that is inclined toward the side of the current collecting section away from the second adhesive film layer.

[0009] In one embodiment, the busbar further includes a second connecting portion, which is connected in series between the first connecting portion and the lead-out section; at least a portion of the second connecting portion is in contact with the first connecting portion or forms a gap therebetween.

[0010] In one embodiment, the first connecting portion includes a first transition section and a first reinforcement section sequentially connected along the current transmission direction, the second connecting portion includes a second reinforcement section and a second transition section sequentially connected along the current transmission direction, the first reinforcement section and the second reinforcement section are in contact with each other or form a gap, and the first reinforcement section is connected to the second reinforcement section; or, the entire structure of the second connecting portion along the current transmission direction is in contact with the first connecting portion or forms a gap with the first connecting portion.

[0011] In one embodiment, a length D of a portion of the second connecting portion where the second connecting portion and the first connecting portion are in contact with each other or have a gap therebetween along the current transmission direction is 2 mm ≤ D ≤ 4 mm.

[0012] In one embodiment, the current collecting section, the first connecting portion, the second connecting portion, and the lead-out section are configured as an integrated structure.

[0013] In one embodiment, the current collecting section, the first connecting portion, the second connecting portion and the lead-out section are integrally formed by sheet metal, die-casting, bending or 3D printing.

[0014] In one embodiment, when the first connecting portion is an arc segment bent toward a side of the current collecting segment away from the second adhesive film layer, the curvature of the arc segment is ≤45°.

[0015] In one embodiment, a distance L between an orthographic projection of a docking position between the first connecting portion and the current collecting segment on the second adhesive film layer and an outline of the lead-out hole is 1 mm to 4 mm.

[0016] A photovoltaic module, comprising a cover plate, a first adhesive film layer, a cell layer, a second adhesive film layer, a back plate and a junction box stacked in sequence; the cell layer comprises a plurality of cells and welding strips electrically connected to the cells; the second adhesive film layer and the back plate are both provided with lead-out holes, and the two lead-out holes are aligned and connected to each other; the cell layer also comprises the bus bar, which extends outward from the lead-out holes and is connected to the junction box.

[0017] A photovoltaic power station includes the photovoltaic components.

[0018] The photovoltaic power station, photovoltaic module and busbar described above are connected in series between the current collecting section and the lead-out section with a first connecting portion arranged corresponding to the position of the lead-out hole contour, and the first connecting portion includes a straight line segment and / or a curved line segment arranged obliquely toward the side of the current collecting section away from the second adhesive film layer, so that the distance between the first connecting portion and the lead-out hole contour at the position directly opposite is greater than the distance between the current collecting section and the second adhesive film layer, thereby reducing the lamination pressure on the busbar at the position directly opposite to the lead-out hole contour during the lamination process, and is consistent with the pressure exerted on other parts of the busbar. The layer pressures are balanced with each other, avoiding excessive pressure at local positions of the busbar, so that the bubbles at the position on the busbar opposite to the lead-out hole outline can be discharged smoothly, thereby avoiding the defect of bubbles gathering and being unable to be discharged at the position on the busbar opposite to the lead-out hole outline due to excessive stress and too fast cross-linking reaction, thereby avoiding the whitening defect; in addition, compared with the related art of setting a black shielding piece in the bending area of ​​the busbar, the material cost of the first connecting part used in the busbar of the present application is lower, and it is easier to produce, the processing difficulty is reduced, and the production efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. 1 is a structural diagram of a bus bar according to an embodiment of the related art.

[0020] Figure 2 FIG. 1 is a structural diagram of a bus bar according to another embodiment of the related art.

[0021] Figure 3 This is a structural diagram of the cell layer of a photovoltaic module according to an embodiment of the present application.

[0022] Figure 4 for Figure 3 Enlarged structural diagram at point A.

[0023] Figure 5 A photovoltaic module according to an embodiment of the present invention is Figure 4 Cross-sectional structure diagram at BB.

[0024] Figure 6 for Figure 5 Structural diagram of the busbars in the shown configuration.

[0025] Figure 7 In another embodiment, a photovoltaic module is Figure 4 Cross-sectional structure diagram at BB.

[0026] Figure 8 for Figure 7 Structural diagram of the busbars in the shown configuration.

[0027] Figure 9 for Figure 8 The three-dimensional structure diagram of the busbar is shown.

[0028] Figure 10 This is a structural diagram of a bus bar according to another embodiment of the present application.

[0029] 110. Black bus bar; 120. Black shielding piece;

[0030] 210. Battery cell layer; 211. Bus bar; 2111. Current collection section; 2112. Lead-out section; 2113. First connection portion; 21131. First transition section; 21132. First reinforcement section; 2114. Second connection portion; 21141. Second reinforcement section; 21142. Second transition section; 212. Battery cell; 213. Welding ribbon; 220. First adhesive film layer; 230. Second adhesive film layer; 231. Lead-out hole; 250. Cover plate; 260. Back plate. DETAILED DESCRIPTION

[0031] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0032] As described in the background technology, the black busbar in the prior art is prone to whitening at the parts surrounding the lead-out hole contour corresponding to the film layer after the lamination step. The inventors have found that the reason for this problem is that during the lamination process, the pressure on the part of the busbar corresponding to the lead-out hole contour of the second film layer is greater than the pressure on other parts of the busbar, which makes the cross-linking reaction of the film layer at the part of the busbar corresponding to the lead-out hole contour of the film layer faster than the cross-linking reaction of other parts, and thus the bubbles are not easily discharged to the outside and lead to aggregation, which easily causes the whitening problem.

[0033] Based on the above reasons, the present application provides a photovoltaic power station, photovoltaic modules and busbars, which can prevent the appearance of whitening defects, while having low material costs, high production efficiency, and avoiding weather risk solutions.

[0034] See Figures 3 to 6 , Figure 3 The structure of the cell layer 210 of the photovoltaic module according to one embodiment of the present application is shown. Figure 4 Shown Figure 3 Enlarged structural diagram at point A. Figure 5 A photovoltaic module according to an embodiment is shown. Figure 4 A structural diagram of an embodiment of the present invention is shown in FIG. Figure 6 Shown Figure 5 Structural diagram of the busbar 211 in the structure shown. One embodiment of the present application provides a busbar 211, which is used to be arranged between the first adhesive film layer 220 and the second adhesive film layer 230, and extends outward from the lead-out hole 231 of the second adhesive film layer 230 to connect to the junction box. The busbar 211 includes a current collecting section 2111, a lead-out section 2112, and a first connecting portion 2113. The current collecting section 2111 is used to connect to at least one welding ribbon 213 of the battery cell layer 210. The lead-out section 2112 is used to connect to the junction box. The first connecting portion 2113 is connected in series between the current collecting section 2111 and the lead-out section 2112. The first connecting portion 2113 is arranged corresponding to the contour position of the lead-out hole 231. The first connecting portion 2113 includes a straight line segment and / or a curved curve segment that is inclined toward the side of the current collecting section 2111 away from the second adhesive film layer 230.

[0035] It should be noted that the first connection portion 2113 is arranged corresponding to the outline of the lead-out hole 231, which means that the projection of the first connection portion 2113 on the surface of the second film layer 230 can intersect with the outline of the lead-out hole 231 along the direction perpendicular to the surface of the second film layer 230.

[0036] When the first connecting portion 2113 is configured as a straight segment inclined toward the side of the current collecting section 2111 away from the second adhesive film layer 230, the first connecting portion 2113 is positioned correspondingly to the contour of the lead-out hole 231, so that the distance S1 at the position where the first connecting portion 2113 and the contour of the lead-out hole 231 directly face each other is greater than the distance S2 between the current collecting section 2111 and the second adhesive film layer 230. Similarly, when the first connecting portion 2113 is configured as a curved segment bent toward the side of the current collecting section 2111 away from the second adhesive film layer 230, the first connecting portion 2113 is positioned correspondingly to the contour of the lead-out hole 231, so that the distance S1 at the position where the first connecting portion 2113 and the contour of the lead-out hole 231 directly face each other is greater than the distance S2 between the current collecting section 2111 and the second adhesive film layer 230.

[0037] In addition, the first connecting portion 2113 can also be set to a combination of straight segments and curved segments, or set to other shapes. The specific setting form can be flexibly adjusted according to actual needs, as long as the spacing S1 at the position where the first connecting portion 2113 and the outline of the lead-out hole 231 are opposite is greater than the spacing S2 between the current collection segment 2111 and the second adhesive film layer 230, and no limitation is made here.

[0038] In some embodiments, the curve segment includes, but is not limited to, various regular and irregular curve shapes such as an arc segment, a parabola segment, or a broken line segment.

[0039] The above-mentioned busbar 211 has a first connecting portion 2113 connected in series between the current collecting section 2111 and the lead-out section 2112, which is arranged corresponding to the outline position of the lead-out hole 231. The first connecting portion 2113 includes a straight segment and / or a curved segment arranged obliquely toward the side of the current collecting section 2111 away from the second adhesive film layer 230. In this way, the distance S1 at the position where the first connecting portion 2113 faces the outline of the lead-out hole 231 is greater than the distance S2 between the current collecting section 2111 and the second adhesive film layer 230. Therefore, during the lamination process, the lamination pressure at the position on the busbar 211 facing the outline of the lead-out hole 231 can be reduced, and the busbar 211 can be connected to the second adhesive film layer 230. The layer pressures exerted on other parts of the busbar 211 are balanced with each other, avoiding excessive pressure at local positions of the busbar 211, so that the bubbles at the position on the busbar 211 that is opposite to the outline of the lead-out hole 231 can be discharged smoothly, thereby avoiding the defect of bubbles gathering and being unable to be discharged at the position on the busbar 211 that is opposite to the outline of the lead-out hole 231 due to excessive stress and too fast cross-linking reaction, thereby avoiding the whitening defect; in addition, compared with the related art of setting a black shielding piece in the bending area of ​​the busbar 211, the material cost of the first connecting part 2113 used in the busbar of this embodiment is lower, and it is easier to produce, the processing difficulty is reduced, and the production efficiency is higher.

[0040] The busbar 211 structure in this embodiment forms an arch or arc at the position of the busbar 211 that is prone to whitening, which can reduce the pressure during the lamination process and avoid whitening defects.

[0041] See also Figure 3 and Figure 4In some embodiments, the busbar 211 further includes a second connection portion 2114. The second connection portion 2114 is connected in series between the first connection portion 2113 and the lead-out section 2112. When at least a portion of the structure of the second connection portion 2114 is in contact with the first connection portion 2113, at least a portion of the structure of the second connection portion 2114 is a reinforcement section, specifically referred to as the second reinforcement section 21141 herein. The reinforcement section in contact with the first connection portion 2113 can form a whole with the first connection portion 2113, thereby increasing the thickness of the plate and thus the structural strength, and protecting the shape of the first connection portion 2113 to a certain extent, so that the first connection portion 2113 is not easily flattened when subjected to a pressure less than a preset range of the layer pressure, and has a better curvature performance, which facilitates control in the production process. Of course, the reinforcement section of the second connection part 2114 is not limited to being in contact with the first connection part 2113, but can also form a gap with the first connection part 2113, that is, it does not fit in contact with the first connection part 2113. When the distance with the first connection part 2113 is small, for example, the distance is controlled within 5 mm, specifically 3 mm or even 1 mm, it can also be regarded as a whole with the first connection part 2113, and also play a certain protective role on the shape of the first connection part 2113, so that the first connection part 2113 is not easily flattened when it is subjected to a pressure less than the preset range of the layer pressure.

[0042] In some embodiments, the second connection portion 2114 in the above embodiment may not be required. For example, the bus bar 211 includes but is not limited to being set as a memory metal or a memory alloy. This not only plays a conductive role, but also has shape memory properties. Even if the first connection portion 2113 is deformed under a pressure within a preset range that is less than the layer pressure, it still has the ability to return to its original shape, and the second connection portion 2114 can be omitted.

[0043] See also Figures 5 to 9In some specific embodiments, the first connecting portion 2113 includes a first transition section 21131 and a first reinforcement section 21132, which are sequentially connected along the current transmission direction. Furthermore, the second connecting portion 2114 includes a second reinforcement section 21141 and a second transition section 21142, which are sequentially connected along the current transmission direction. The first reinforcement section 21132 and the second reinforcement section 21141 are aligned with each other or have a gap therebetween, and the first reinforcement section 21132 and the second reinforcement section 21141 are connected. This alignment or gap between the first reinforcement section 21132 and the second reinforcement section 21141 increases structural strength and protects the shape of the first connecting portion 2113, preventing it from being flattened when subjected to pressure below a predetermined range of the lamination pressure. At the same time, the first reinforcement section 21132 is also connected to the current collection section 2111 via the first transition section 21131, and the second reinforcement section 21141 is also connected to the lead section 2112 via the second transition section 21142. This allows for adjustment of the relative position of the lead section 2112 and the lead hole 231, allowing the lead section 2112 to smoothly pass through the lead hole 231. Specifically, the first transition section 21131 can be either a straight section inclined toward the side of the current collection section 2111 facing away from the second adhesive film layer 230, or a curved section. This is sufficient as long as the spacing S1 between the first transition section 21131 and the outline of the lead hole 231 is greater than the spacing S2 between the current collection section 2111 and the second adhesive film layer 230, thereby reducing the lamination pressure on the busbar 211 at the position directly opposite the outline of the lead hole 231 during the lamination process.

[0044] See also Figure 10 In some specific embodiments, the second transition section 21142 of the above embodiment can be omitted, and the entire structure of the second connecting portion 2114 along the current transmission direction is affixed to the first connecting portion 2113 or forms a gap with the first connecting portion 2113. In addition, the length of the first connecting portion 2113 along the current transmission direction is greater than the length of the second connecting portion 2114 along the current transmission direction. This prevents the lead-out section 2112 from being too close to the wall of the lead-out hole 231, preventing it from smoothly passing through the lead-out hole 231.

[0045] See also Figure 6 or Figure 8In some embodiments, the length D of the portion of the second connection portion 2114 that is in contact with or has a gap with the first connection portion 2113 along the current transmission direction is 2mm≤D≤4mm. The length D includes but is not limited to 2mm, 2.5mm, 3mm, 3.5mm or 4mm. In this way, the length D is set more appropriately, so that the reinforcement effect of the first connection portion 2113 meets the process requirements, protects the shape of the first connection portion 2113, and also facilitates the welding operation of the lead segment and the junction box; in addition, when the length D is less than 2mm, the lamination process cannot eliminate the stress in the bending area; when the length D is greater than 4mm, due to the size limitation of the lead-out hole 231, there is a risk of overlapping of the busbar 211, and the welding difficulty of the junction box is increased.

[0046] In some embodiments, the current collection section 2111, the first connection portion 2113, the second connection portion 2114, and the lead-out section 2112 are configured as an integrated structure. Specifically, the current collection section 2111, the first connection portion 2113, the second connection portion 2114, and the lead-out section 2112 include, but are not limited to, sheet metal one-piece molding, die-cast one-piece molding, bending one-piece molding, or 3D printing one-piece molding. For example, in this embodiment, two metal sheets are first processed and connected at an angle, and the angle between the two metal sheets is, for example, 60°, 90°, or 120°; then, the corners of the two metal sheets are extruded using an extrusion tool or manually, so that the corners of the two metal sheets form the first connection portion 2113 and the second connection portion 2114, respectively.

[0047] In some embodiments, when the first connecting portion 2113 is an arc-shaped segment that curves toward the side of the current collecting section 2111 away from the second adhesive film layer 230, the curvature of the arc segment is ≤ 45°. Thus, on the one hand, the curvature of the arc segment can be, for example, 15°, 30°, 35°, or 45°. A larger curvature allows the spacing S1 between the first connecting portion 2113 and the outline of the lead-out hole 231 to be greater than the spacing S2 between the current collecting section 2111 and the second adhesive film layer 230. This reduces the lamination pressure on the busbar 211 at the location directly opposite the outline of the lead-out hole 231 during the lamination process, balancing the lamination pressure on other portions of the busbar 211 and preventing excessive pressure on localized locations of the busbar 211. Furthermore, the curvature of the arc segment is not excessively large, preventing increased difficulty in laying the package board.

[0048] See also Figure 5In some embodiments, the distance L between the orthographic projection of the first connection portion 2113 and the current collection segment 2111 on the second film layer 230 and the outline of the lead-out hole 231 is 1 mm to 4 mm. Specifically, the distance L includes, but is not limited to, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, or 4 mm. Thus, the distance L is appropriately sized to reduce the lamination pressure at the location on the busbar 211 directly opposite the outline of the lead-out hole 231 during the lamination process, and to balance the lamination pressure on other parts of the busbar 211, thereby avoiding excessive pressure on localized locations on the busbar 211.

[0049] See also Figure 5 In one embodiment, the present application provides a photovoltaic module, which includes a cover plate 250, a first adhesive film layer 220, a cell layer 210, a second adhesive film layer 230, a back plate 260 and a junction box stacked in sequence. The cell layer 210 includes a plurality of cell sheets 212 and a welding ribbon 213 electrically connected to the cell sheets 212. The welding ribbon 213 is used to connect the plurality of cell sheets 212 in series to form a cell string. In addition, both the second adhesive film layer 230 and the back plate 260 are provided with lead-out holes 231, and the two lead-out holes 231 are aligned and connected to each other. The cell layer 210 also includes a bus bar 211 according to any of the above embodiments, and the bus bar 211 extends outward from the lead-out hole 231 and is connected to the junction box. Optionally, the bus bar 211 is connected to more than one welding ribbon 213, for example, it is connected to multiple welding ribbons 213, that is, it is connected to multiple cell strings.

[0050] It should be noted that the specific number of welding strips 213 connected to a busbar 211 can be flexibly adjusted and set according to needs, and is not limited here. In this way, the currents of multiple battery strings are respectively delivered to the busbar 211 through multiple welding strips 213, and the busbar 211 outputs the current to the junction box, so that the current collection efficiency is improved. In addition, there is more than one busbar 211, but it can be set to multiple, for example. The specific number of busbars 211 can be flexibly adjusted and set according to actual needs, and is not limited here. When the number of busbars 211 is increased, the current collection efficiency can be further improved. Among them, for two adjacently arranged busbars 211, the lead-out sections 2112 of the two busbars 211 are, for example, led out through the same lead-out hole 231 and connected to the junction box, thereby reducing the number of lead-out holes 231 and simplifying the structure of the photovoltaic module.

[0051] In the photovoltaic module described above, since a first connection portion 2113 corresponding to the outline position of the lead-out hole 231 is connected in series between the current collecting section 2111 and the lead-out section 2112, the first connection portion 2113 includes a straight line segment and / or a curved line segment inclined toward the side of the current collecting section 2111 away from the second adhesive film layer 230, so that the distance S1 at the position where the first connection portion 2113 faces the outline of the lead-out hole 231 is greater than the distance S2 between the current collecting section 2111 and the second adhesive film layer 230, thereby reducing the lamination pressure at the position on the bus bar 211 facing the outline of the lead-out hole 231 during the lamination process, and The layer pressures exerted on other parts of 211 are balanced with each other, avoiding excessive pressure at local positions of the busbar 211, so that the bubbles at the position on the busbar 211 that is opposite to the outline of the lead-out hole 231 can be discharged smoothly, thereby avoiding the defect of bubbles gathering and being unable to be discharged at the position on the busbar 211 that is opposite to the outline of the lead-out hole 231 due to excessive stress and too fast cross-linking reaction, thereby avoiding the whitening defect; in addition, compared with the related art of setting a black shielding piece in the bending area of ​​the busbar 211, the material cost of the first connecting part 2113 used in the busbar in this embodiment is lower, and it is easier to produce, the processing difficulty is reduced, and the production efficiency is higher.

[0052] In some embodiments, the first and second film layers 220 and 230 are independently provided and may be organic encapsulating films such as EVA or POE. These encapsulating films cover the surface of the cell string to seal and protect it. During the lamination process, the first and second film layers 220 and 230 undergo a cross-linking reaction, thereby securing the cover plate 250, cell layer 210, and backsheet 260, thereby protecting the photovoltaic module.

[0053] Furthermore, the cover plate 250 can be made of glass or plastic to protect the cell strings. Optionally, a light-trapping structure can be provided on the cover plate 250 to increase the utilization of incident light. Specifically, the cover plate 250 can be made of glass or plastic, thereby providing light transmission. Furthermore, the photovoltaic module has a high current collection capacity and a low carrier recombination rate, achieving high photoelectric conversion efficiency.

[0054] In one embodiment, the present application provides a photovoltaic power station, which includes the photovoltaic assembly of any of the above embodiments.

[0055] In the photovoltaic power station described above, the busbar 211 in the photovoltaic module is connected in series with a first connection portion 2113 arranged corresponding to the outline position of the lead-out hole 231 between the current collection section 2111 and the lead-out section 2112. The first connection portion 2113 includes a straight line segment and / or a curved line segment arranged obliquely toward the side of the current collection section 2111 away from the second adhesive film layer 230. In this way, the spacing S1 at the position where the first connection portion 2113 faces the outline of the lead-out hole 231 is greater than the spacing S2 between the current collection section 2111 and the second adhesive film layer 230. Therefore, during the lamination process, the lamination pressure at the position on the busbar 211 facing the outline of the lead-out hole 231 can be reduced. , and balances the layer pressure exerted on other parts of the busbar 211, avoiding excessive pressure at local positions of the busbar 211, so that the bubbles at the position on the busbar 211 that is opposite to the outline of the lead-out hole 231 can be discharged smoothly, thereby avoiding the defect of bubbles gathering and being unable to be discharged at the position on the busbar 211 that is opposite to the outline of the lead-out hole 231 due to excessive stress and too fast cross-linking reaction, thereby avoiding the whitening defect; in addition, compared with the related art of setting a black shielding piece in the bending area of ​​the busbar 211, the material cost of the first connecting part 2113 used in the busbar 211 in this embodiment is lower, and it is easier to produce, the processing difficulty is reduced, and the production efficiency is higher.

[0056] In the description of this 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 this 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 this application.

[0057] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0058] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0059] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this 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. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0060] 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 an intermediate 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 an intermediate element. 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 embodiment.

[0061] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0062] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A busbar, arranged between a first adhesive film layer (220) and a second adhesive film layer (230), and extending outward from an outlet hole (231) of the second adhesive film layer (230) to connect to a junction box, characterized in that: The busbar (211) comprises: a current collecting section (2111), the current collecting section (2111) being used to be connected to at least one welding strip (213) of the battery layer (210); an outlet section (2112), the outlet section (2112) being used to be connected to the junction box; and A first connecting portion (2113), the first connecting portion (2113) is connected in series between the current collecting section (2111) and the lead-out section (2112), the first connecting portion (2113) is arranged corresponding to the contour position of the lead-out hole (231), and the first connecting portion (2113) includes a straight line segment and / or a curved curve segment that is inclined toward the side of the current collecting section (2111) away from the second adhesive film layer (230).

2. The bus bar according to claim 1, wherein: The busbar (211) further includes a second connecting portion (2114), which is connected in series between the first connecting portion (2113) and the lead-out section (2112); at least a portion of the structure of the second connecting portion (2114) is in contact with the first connecting portion (2113) or forms a gap therebetween.

3. The bus bar according to claim 2, wherein: The first connecting portion (2113) includes a first transition section (21131) and a first reinforcement section (21132) which are sequentially connected along the current transmission direction; the second connecting portion (2114) includes a second reinforcement section (21141) and a second transition section (21142) which are sequentially connected along the current transmission direction; the first reinforcement section (21132) and the second reinforcement section (21141) are fitted to each other or form a gap; the first reinforcement section (21132) and the second reinforcement section (21141) are connected; or, the entire structure of the second connecting portion (2114) along the current transmission direction is fitted to the first connecting portion (2113) or forms a gap with the first connecting portion (2113).

4. The bus bar according to claim 2, wherein: The length D of the portion of the second connecting portion (2114) where the first connecting portion (2113) is in contact with each other or where a gap is formed is 2 mm ≤ D ≤ 4 mm along the current transmission direction.

5. The bus bar according to claim 2, wherein: The current collecting section (2111), the first connecting portion (2113), the second connecting portion (2114) and the lead-out section (2112) are configured as an integrated structure.

6. The bus bar according to claim 5, wherein: The current collecting section (2111), the first connecting portion (2113), the second connecting portion (2114) and the lead-out section (2112) are formed in one piece by sheet metal, in one piece by die casting, in one piece by bending or in one piece by 3D printing.

7. The bus bar according to claim 1, wherein: When the first connecting portion (2113) is an arc segment bent toward the current collecting section (2111) and away from the second adhesive film layer (230), the curvature of the arc segment is ≤45°.

8. The bus bar according to claim 1, wherein: The distance L between the orthographic projection of the docking position of the first connecting portion (2113) and the current collecting section (2111) on the second adhesive film layer (230) and the outline of the lead-out hole (231) is 1 mm to 4 mm.

9. A photovoltaic module, characterized in that: The photovoltaic module comprises a cover plate (250), a first adhesive film layer (220), a cell layer (210), a second adhesive film layer (230), a back plate (260) and a junction box which are stacked in sequence; the cell layer (210) comprises a plurality of cell sheets (212) and a welding strip (213) electrically connected to the cell sheets (212); the second adhesive film layer (230) and the back plate (260) are both provided with lead-out holes (231), and the two lead-out holes (231) are aligned and connected to each other; the cell layer (210) further comprises a bus bar (211) as claimed in any one of claims 1 to 8, and the bus bar (211) passes outward from the lead-out holes (231) to be connected to the junction box.

10. A photovoltaic power station, characterized in that: The photovoltaic power station includes the photovoltaic assembly according to claim 9.

Images