Photovoltaic module and photovoltaic system

Abstract

The embodiment of the utility model provides a photovoltaic module and a photovoltaic system. The photovoltaic module comprises interconnection strips, a middle bus bar and a back plate. The plurality of battery pieces are welded in series by the interconnection strip to form a battery string, and the interconnection strip is welded with the middle bus bar positioned at the end part of the battery string; the battery pieces are provided with edge interconnection strips, the back plate is provided with a wire outlet hole, the wire outlet hole is located between the two middle bus bars, and on at least one battery piece surrounding the wire outlet hole, one edge interconnection strip adjacent to the wire outlet hole comprises a main body section and an extension section; the main body section is completely positioned on the battery piece, and the main body section is welded and fixed with each bonding pad on the battery piece; the extension section extends to the middle bus bar from a bonding pad closest to the middle bus bar in the battery piece and is in lap joint with the middle bus bar, and at least part of the extension section located outside the wire outlet hole is welded and fixed with the middle bus bar. According to the embodiment of the invention, the pseudo soldering risk and the hidden crack risk of the photovoltaic module can be reduced, and the product yield can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic string welding, and in particular to a photovoltaic module and a photovoltaic system. Background Art

[0002] In a photovoltaic module, the battery string needs to be welded and fixed to the middle bus bar at the end of the battery string to collect and output the current of the battery strings at different positions.

[0003] When manufacturing photovoltaic modules, the ends of the middle busbars need to be bent and led out from the outlet holes on the back plate to make electrical connections with the junction box. When the interconnection bar is welded to the bent part of the middle busbar, there is a gap when the two are overlapped and welded, which can easily lead to unreliable welding and cold welding.

[0004] Therefore, during the manufacture of existing photovoltaic modules, quality defects such as cold welding are easily generated when the battery strings are overlap-welded with the middle busbars. Utility Model Content

[0005] The present application provides a photovoltaic module and a photovoltaic system, aiming to solve the problem of poor solder joint quality defects that are easily generated when manufacturing photovoltaic modules.

[0006] The embodiment of the present application provides a photovoltaic module, the photovoltaic module comprising an interconnection bar, an intermediate bus bar and a back plate;

[0007] The interconnection bar welds a plurality of battery cells in series to form a battery string, and the interconnection bar is welded to the middle bus bar located at the end of the battery string;

[0008] The battery sheet is provided with an edge interconnection bar, the back plate is provided with a wire outlet hole, and the wire outlet hole is located between the two middle bus bars, and on at least one battery sheet surrounding the wire outlet hole, an edge interconnection bar adjacent to the wire outlet hole includes a main section and an extension section;

[0009] The main body section is entirely located on the battery sheet, and the main body section is welded and fixed to each pad on the battery sheet arranged along the first direction of the photovoltaic module;

[0010] The extension section extends from the pad closest to the middle bus bar in the battery cell to the middle bus bar, overlaps with the middle bus bar, and at least the portion of the extension section outside the outlet hole is welded and fixed to the middle bus bar.

[0011] Optionally, the main body section and the extension section have a smooth arc transition or a first angle α, 90°≤α≤180°.

[0012] Optionally, the extension section includes a first extension section and a second extension section;

[0013] The first extension section extends from the center of the pad closest to the middle bus bar in the battery string, and the first extension section forms the first angle α with the main section;

[0014] The second extension section extends toward the middle bus bar, the second extension section intersects with the first extension section to form a second angle β, and the first angle α and the second angle β are located on the same side of the edge interconnection bar;

[0015] The second extension section overlaps the middle bus bar, and at least a portion of the second extension section is fixed to the middle bus bar by welding.

[0016] Optionally, when α=90°, 250°≤β≤290°.

[0017] Optionally, when 90°<α<180°, 270°-α≤β≤360°-α.

[0018] Optionally, when α=180°, 90°≤β≤160°.

[0019] Optionally, when β=90°, the length of the first extension section is K, 7.5 mm<K<14.5 mm; and / or,

[0020] When β=90°, the length of the second extension section is M, 4mm<M<22mm.

[0021] Optionally, when 90°<β≤160°, the length of the first extension section is K, 0mm<K<11.5mm; and / or,

[0022] When 90°<β≤160°, the distance between the vertex of the first angle α and the end point of the second extension section in the width direction of the middle bus bar is L1, 4mm<L1<17.5mm.

[0023] Optionally, the extension segment includes a third extension segment, a fourth extension segment and a fifth extension segment;

[0024] The third extension section extends from the center of the pad closest to the middle bus bar in the battery string, and the first angle α is formed between the third extension section and the main section;

[0025] The fourth extension segment intersects with the third extension segment and the fifth extension segment to form a third angle γ and a fourth angle δ, respectively. The third angle γ and the fourth angle δ are located on the same side of the extension segment, and the first angle α and the third angle γ are located on different sides of the edge interconnection strip.

[0026] The fifth extension section extends to the middle bus bar and overlaps with the middle bus bar, and at least a portion of the fifth extension section is welded and fixed to the middle bus bar.

[0027] Optionally, when α=90°, γ=90°, 180°<δ<270°; or,

[0028] When α=90°, 90°<γ<180°, 270°-γ<δ<360°-γ, and δ≠180°.

[0029] Optionally, when 90°<α<180°, α≤γ<180°, 180°-(γ-α)<δ<270°, and δ≠180°.

[0030] Optionally, when α=180°, 180°≤γ<270°, and 90°≤δ<180°.

[0031] Optionally, the length of the third extension section is E, 0mm<E<15mm; and / or,

[0032] The distance between the two vertices of the third angle γ and the fourth angle δ in the length direction of the middle bus bar is F, 2mm≤F≤22mm; and / or,

[0033] The distance between the vertex of the fourth angle δ and the end point of the fifth extension section in the width direction of the middle bus bar is G, 0mm<G<15mm.

[0034] Optionally, the battery cell includes a 0BB battery cell or a MBB battery cell.

[0035] Optionally, the battery cell comprises a back contact battery.

[0036] Optionally, the battery cell is an n-slice battery, where n is a positive integer not less than 2; and / or,

[0037] The length of one side of the battery cell is within the range of 94±3 mm, and the length of the other side of the battery cell is within the range of 182.2±5 mm; and / or,

[0038] The thickness of the battery cell is 100um to 300um; and / or,

[0039] The length of the whole cell before being cut into pieces is 150 mm to 300 mm; and / or,

[0040] The aspect ratio of the battery cell is 20600 to 51500; and / or,

[0041] The cell sheet includes one of a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell or a multi-compound solar cell.

[0042] Optionally, a plurality of main grids are arranged on each of the solar cells, and the number of welding pads arranged on each main grid is greater than 7 and less than 20; and / or,

[0043] The number of main grids provided on each of the solar cells is more than 7 and less than 30; and / or,

[0044] The width of the main grid is 40um to 80um; and / or,

[0045] The number of fine grids arranged on each of the solar cells is more than 100 and less than 250; and / or,

[0046] The width of the fine grid is 20um to 60um.

[0047] Optionally, the length of the photovoltaic module is 1700 mm to 2500 mm; and / or,

[0048] The width of the photovoltaic module is 1100 mm to 1200 mm.

[0049] The present application also provides a photovoltaic system, comprising a plurality of any of the aforementioned photovoltaic components arranged in an array.

[0050] In the photovoltaic module of the embodiment of the present application, at least the extension section of the edge interconnection bar located on the middle bus bar and outside the outlet hole is welded to the middle bus bar, thereby avoiding the bent portion of the middle bus bar, reducing the risk of cold welding of the photovoltaic module, and improving the product yield. In addition, the heights of the bent portions of the two middle bus bars on both sides of the outlet hole are more consistent, and the stress at this position is more uniform after lamination, which can reduce the risk of hidden cracks in the module. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0052] Figure 1 A partial schematic diagram of a photovoltaic module in an embodiment of the present application is shown;

[0053] Figure 2 A schematic diagram showing a first arrangement of edge interconnection strips near the outlet holes in a photovoltaic module according to an embodiment of the present application is shown;

[0054] Figure 3A schematic diagram showing a second arrangement of edge interconnection strips near the outlet holes in the photovoltaic module according to the embodiment of the present application is shown;

[0055] Figure 4 A third layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0056] Figure 5 A fourth layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0057] Figure 6 A fifth layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0058] Figure 7 A sixth layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0059] Figure 8 A seventh layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0060] Fig. 9 An eighth layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0061] Fig.10 A ninth layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0062] Fig.11 A tenth layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0063] Fig.12 An eleventh layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0064] Fig.13 A twelfth layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0065] Fig.14 The thirteenth layout schematic diagram of the edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0066] Fig.15 A fourteenth layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0067] Fig.16A schematic diagram showing a fifteenth arrangement of edge interconnection strips near the outlet holes in the photovoltaic module according to the embodiment of the present application is shown;

[0068] Fig.17 A schematic diagram showing a sixteenth arrangement of edge interconnection strips near the outlet holes in the photovoltaic module according to the embodiment of the present application is shown;

[0069] Fig.18 A seventeenth layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0070] Fig.19 An eighteenth layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0071] Fig. 20 A nineteenth layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0072] Fig.21 A schematic diagram showing the twentieth arrangement of edge interconnection strips near the outlet holes in the photovoltaic module according to the embodiment of the present application is shown;

[0073] Fig. 22 A twenty-first layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0074] Fig.23 A twenty-second layout schematic diagram of edge interconnection strips near the outlet holes in the photovoltaic module of the embodiment of the present application is shown;

[0075] Fig.24 A twenty-third schematic diagram of the layout of edge interconnection strips near the wire outlet holes in the photovoltaic module of the embodiment of the present application is shown.

[0076] Description of the accompanying drawings:

[0077] Interconnection bar-10, middle bus bar-11, edge interconnection bar-101, wire outlet hole-121, battery cell-20, pad-201, main section-1011, extension section-1012, first extension section-1012a, second extension section-1012b, third extension section-1012c, fourth extension section-1012d, fifth extension section-1012e, first angle-α, second angle-β, third angle-γ, fourth angle-δ. DETAILED DESCRIPTION

[0078] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0079] Reference Figure 1 and Figure 2 , an embodiment of the present application provides a photovoltaic module, the photovoltaic module comprising an interconnection bar 10, an intermediate bus bar 11 and a back plate (not shown in the figure);

[0080] The interconnection bar 10 welds a plurality of battery cells 20 in series to form a battery string, and the interconnection bar 10 is welded to the middle bus bar 11 located at the end of the battery string;

[0081] The battery sheet 20 is provided with an edge interconnection bar 101, the back plate is provided with a wire outlet hole 121, and the wire outlet hole 121 is located between the two middle bus bars 11, and on at least one battery sheet 20 surrounding the wire outlet hole 121, an edge interconnection bar 101 adjacent to the wire outlet hole 121 includes a main section 1011 and an extension section 1012;

[0082] The main body section 1011 is entirely located on the battery cell 20 , and the main body section 1011 is welded and fixed to each pad 201 on the battery cell 20 ;

[0083] The extension section 1012 extends from the pad 201 closest to the intermediate bus bar 11 in the battery cell 20 to the intermediate bus bar 11, overlaps with the intermediate bus bar 11, and at least the portion of the extension section 1012 located outside the wire outlet hole 121 is welded and fixed to the intermediate bus bar 11.

[0084] Figure 1 A simplified schematic diagram of a photovoltaic module according to an embodiment of the present application is shown. The photovoltaic module is arrayed with multiple solar cells 20 along its length and width. Figure 1 In the illustrated X direction, multiple battery cells 20 are welded together through interconnection bars 10 to form a battery string. Multiple battery strings are arranged along the illustrated Y direction and are all welded to the middle bus bar 11. The middle bus bar 11 collects and outputs the current generated in each battery string.

[0085] Combination Figure 1 As shown in FIG. 1 , the plurality of cells 20 in the photovoltaic module can be collectively referred to as a battery pack. Figure 1In the Y direction shown, the upper part can be called the first battery group, and the lower part can be called the second battery group. The middle bus bar 11 is located between the first battery group and the second battery group, and can collect and output the current of the battery groups at different positions. It should be noted that the bus bar set at one end of the battery string and close to the side of the photovoltaic module is an edge bus bar, and the middle bus bar 11 in the embodiment of the present application is a bus bar at the other end of the battery string and in the middle area of ​​the module. The edge bus bar and the middle bus bar 11 collect current from both ends of the battery string respectively.

[0086] In the photovoltaic module, all cells 20 are supported and fixed by the back sheet, and can be fixed on the surface of the back sheet by lamination with adhesive film. When the back sheet is made of an opaque back sheet or a glass back sheet, the photovoltaic module is called a single glass module or a double glass module accordingly.

[0087] In order to lead the middle bus bar 11 out of the back plate to achieve electrical connection with the junction box on the back plate surface, the back plate is provided with a wire outlet hole 121. The end of the middle bus bar 11 can be bent and passed through the wire outlet hole 121, and then connected to the junction box.

[0088] Combination Figure 1 As shown in FIG. 1 , the outlet hole 121 on the back plate is located between the two middle bus bars 11, and the battery cells 20 from different battery strings are distributed around one outlet hole 121. Figure 1 In the figure, battery cell 20a is a battery cell in a battery string in the first battery group, battery cell 20b is a battery cell in another battery string in the first battery group, battery cell 20c is a battery cell in a battery string in the second battery group, and battery cell 20d is a battery cell in another battery string in the second battery group.

[0089] like Figure 1 As shown in the figure, when multiple battery cells 20 are serially welded together using interconnection bars 10, an interconnection bar 10 adjacent to the side of the battery cell 20 is an edge interconnection bar 101, and the remaining interconnection bars 10 within the edge interconnection bars 101 corresponding to the two sides are middle interconnection bars.

[0090] Combination Figure 1 As shown in the figure, when each interconnection bar 10 extends from the end of the battery string and is welded to the middle bus bar 11, for the four battery cells 20 surrounding the outlet hole 121, the distance between the edge interconnection bar 101 on each battery cell 20 and the center of the outlet hole 121 is not exactly the same, and there is a difference in distance. It is easy to understand that when the edge interconnection bar 101 closest to the center of the outlet hole 121 is along the Figure 1 When the X direction directly extends toward the middle bus bar 11 for welding, since the middle bus bar 11 has a bent portion at the outlet hole 121, the overlap position of the edge interconnection bar 101 is close to the bent portion, which can easily lead to a cold weld.

[0091] Combination Figure 2 In the embodiment of the present application, the edge interconnection strip 101 is divided into a main section 1011 and an extension section 1012. The main section 1011 and the extension section 1012 can be the division of different functional sections of the same complete welding strip, or two independent sections of welding strips welded together. The main section 1011 is entirely located on the battery cell 20, and the main section 1011 is welded and fixed to each pad 201 on the battery cell 20. The pads 201 connected to the main section 1011 are pads of the same polarity, and the linear arrangement direction of these pads of the same polarity is also the length direction of the battery string.

[0092] The pad 201 of the battery cell 20 closest to the middle bus bar 11 in the extension section 1012 extends to the middle bus bar 11, a part of the extension section 1012 is located on the battery cell 20, another part spans the gap between the battery cell 20 and the middle bus bar 11, and the last part of the extension section 1012 is located on the middle bus bar 11. In addition, a part of the last part of the extension section 1012 is located outside the outlet hole 121. When welding the edge interconnection bar 101 and the middle bus bar 11, at least this part is welded to the middle bus bar 11, so that the welding area can avoid the bending part of the middle bus bar 11, thereby helping to reduce the risk of cold welding. In addition, on this basis, the part of the extension section 1012 located on the middle bus bar 11 and inside the outlet hole 121 can also be welded to the middle bus bar 11. Although this position may be cold welded, it can still form a supplementary reinforcement for the welding area outside the outlet hole 121.

[0093] Therefore, in the embodiment of the present application, at least the extension section 1012 of the edge interconnection bar 101 located on the middle bus bar 11 and outside the outlet hole 121 is welded to the middle bus bar 11, thereby avoiding the bent portion of the middle bus bar 11, reducing the risk of cold welding of the photovoltaic module, and improving the product yield. In addition, the heights of the bent portions of the two middle bus bars 11 on both sides of the outlet hole 121 are more consistent, and the stress at this position is more uniform after lamination, which can reduce the risk of hidden cracks in the module.

[0094] Optionally, the main section 1011 and the extension section 1012 have a smooth transition arc or a first angle α, 90°≤α≤180°.

[0095] Specifically, in one embodiment, when laying out the edge interconnection strip 101, the portion between the main segment 1011 and the extension segment 1012 may be designed as a curve shape so that the arc of the portion transitions smoothly, thereby reducing the bending stress of the interconnection strip and the risk of fracture. The curve shape may be a quarter of a circle or an ellipse or other curve shapes.

[0096] In another embodiment, if Figure 2 As shown in the figure, the layout direction of the main section 1011 is consistent with the arrangement direction of each pad 201, and the extension section 1012 is tilted within a certain angle range compared to the main section 1011, and a first angle α is formed between the two.

[0097] like Figure 2 As shown in the figure, when the first angle α=90°, the main section 1011 and a part of the extension section 1012 are perpendicular, the main section 1011 is parallel to the X direction shown in the figure, and a part of the extension section 1012 is parallel to the Y direction shown in the figure. Figure 3 As shown in the figure, when the first angle α=180°, the main section 1011 and a part of the extension section 1012 are on the same straight line, and a part of the main section 1011 and the extension section 1012 are parallel to the X direction shown in the figure, which is a special case that the extension section 1012 is tilted. Figure 4 As shown in FIG. 1 , when the first angle α is greater than 90° and less than 180°, the extension section 1012 extends obliquely toward the middle bus bar 11. In addition, the first angle α may also be 110°, 120°, 150°, 160°, 170°, etc.

[0098] It should be noted that in the embodiment of the present application, the center of the pad 201 closest to the middle bus bar 11 is used as the boundary between the main section 1011 and the extension section 1012, that is, the center of the pad 201 closest to the middle bus bar 11 coincides with the vertex of the first angle α.

[0099] As shown in the figure, when the first angle α is any angle value between 90° and 180°, the extension section 1012 can be guided to be arranged toward a position away from the outlet hole 121 , and the extension section 1012 can be made to avoid the outlet hole 121 from its starting point.

[0100] Optionally, refer to Figures 2 to 4 , the extension section 1012 includes a first extension section 1012a and a second extension section 1012b;

[0101] The first extension section 1012a extends from the center of the pad 201 closest to the middle bus bar 11 in the battery string, and the first angle α is formed between the first extension section 1012a and the main section 1011;

[0102] The second extension section 1012b extends toward the middle bus bar 11, and the second extension section 1012b intersects with the first extension section 1012a to form a second angle β, and the first angle α and the second angle β are located on the same side of the edge interconnection bar 101;

[0103] The second extension section 1012 b overlaps the middle bus bar 11 , and at least a portion of the second extension section 1012 b is fixed to the middle bus bar 11 by welding.

[0104] Specifically, if Figures 2 to 4 As shown, in one embodiment, the extension section 1012 can be bent once to form two sections, specifically including a first extension section 1012a and a second extension section 1012b. The first extension section 1012a is connected to the main section 1011, and the first extension section 1012a extends from the center of the pad 201 closest to the middle bus bar 11 in the battery string. After the first extension section 1012a is deflected relative to the main section 1011, a first angle α is formed between the first extension section 1012a and the main section 1011. The first angle α and the second angle β are located on the same side of the edge interconnection bar 101 (as shown in the figure, α and β are both located on the right side of the edge interconnection bar 101). The second extension section 1012b is connected to the end of the first extension section 1012a, and after the second extension section 1012b is deflected relative to the first extension section 1012a, a second angle β is formed between the second extension section 1012a and the first extension section 1012a. The second extension section 1012b extends toward the middle bus bar 11 until it overlaps with the middle bus bar 11.

[0105] In this embodiment, based on different combinations of the first angle α and the second angle β, different shapes of extension segments 1012 can be combined, and the extension segments 1012 of various shapes can all be staggered with the welding area of ​​the middle bus bar 11 to avoid the outlet hole 121. In the extension segments 1012 of various shapes, the vertex of the second angle β can be located on the battery cell 20, or in the gap between the battery cell 20 and the middle bus bar 11, or on the middle bus bar 11, which is specifically determined by the length of the first extension segment 1012a. The vertex position of the second angle β is not limited in the embodiment of the present application.

[0106] Optionally, refer to Figure 2 , Figure 5 and Figure 6 , when α=90°, 250°≤β≤290°.

[0107] Specifically, in one embodiment, when the first angle α=90°, the first extension section 1012a directly extends from the right side of the pad 201. Figure 2 As shown in FIG. 1 , when the length of the first extension section 1012a is such that the vertex of the second angle β is just outside the outlet hole 121 along the X direction, the second angle β can be designed to be 90°, and the second extension section 1012b extends downward along the X direction to directly avoid the outlet hole 121. Figure 5As shown in FIG. 1 , when the length of the first extension section 1012a is short, the second angle β can be designed to be greater than 180° (for example, β=250°), so that the second extension section 1012b extends obliquely to the lower right side, making it easier to avoid the wire outlet hole 121. Figure 6 As shown in FIG. 1 , when the length of the first extension segment 1012a is longer, the second angle β can be designed to be greater than 270° (for example, β=290°), and the second extension segment 1012b can be extended slightly to the left to avoid crossing another adjacent interconnection strip.

[0108] Optionally, refer to Figure 4 , Figures 7 to 9 , when 90°<α<180°, 270°-α≤β≤360°-α.

[0109] Specifically, in one embodiment, when 90°<α<180°, the first extension section 1012a is inclined to be equivalent to the main section 1011. For example, α can be 95°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, etc.

[0110] Combination Figure 4 It is easy to understand that, in the process of α gradually increasing from 90° to 180°, if β is greater than 360°-α, the second extension section 1012b is more likely to intersect with the outlet hole 121 after extending to the middle bus bar 11, and vice versa, it is easier to avoid the outlet hole 121. If β is less than 270°, the second extension section 1012b may not overlap with the middle bus bar 11 after extension. Therefore, 270°-α≤β≤360°-α, for example, according to different values ​​of α, β can be 150°, 160°, 170°, 180°, 190°, 200°, 210°, 220°, 230°, 240°, 250°, 260°, etc.

[0111] Figures 7 to 9 The shapes of the extension section 1012 corresponding to different combinations of α and β when the above angle range is satisfied are shown respectively. Figure 7 As shown in the figure, α = 100°, β = 260°. Figure 8 , α=120°, β=180°, at this time, the first extension section 1012a and the second extension section 1012b are on the same straight line, which is equivalent to not dividing the extension section 1012 into different sections, and the extension section 1012 can be regarded as a complete section without bending, and the extension section 1012 as a whole directly extends from the center of the pad 201 to the right lower side to the bus bar 11. Fig. 9 As shown in the figure, α=120°, β=240°.

[0112] Optionally, refer to Figure 3 , Figures 10 to 12 , when α=180°, 90°≤β≤160°.

[0113] Specifically, in one implementation, when α=180°, the first extension section 1012a and the main section 1011 are on the same straight line.

[0114] Combination Figure 3 As shown in the figure, it is easy to understand that when β is greater than 90°, the second extension section 1012b can be tilted downward and rightward and extend to the middle bus bar 11. At this time, if β is greater than or equal to 160°, the second extension section 1012b may pass through the outlet hole 121 after extension. Therefore, 90°≤β≤160°, for example, β can be 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, etc.

[0115] Figures 10 to 12 The shapes of the extension section 1012 corresponding to different combinations of α and β when the above angle range is satisfied are shown respectively. Fig.10 As shown in the figure, α = 180°, β = 90°. Fig.11 As shown in the figure, α = 180°, β = 135°. Fig.12 , α=180°, β=160°

[0116] Optionally, refer to Fig.10 When β=90°, the length of the first extension section 1012a is K, 7.5mm<K<14.5mm.

[0117] Specifically, based on the above embodiments, Fig.10 As shown, in a type of component, when α=180° and β=90°, if the length K of the first extension section 1012a is less than 7.5mm, the first extension section 1012a cannot contact and overlap the middle bus bar 11. If the length K of the first extension section 1012a is greater than or equal to 14.5mm, the end of the first extension section 1012a is just at the edge of the middle bus bar 11 or extends out. Therefore, in the embodiment of the present application, the length K of the first extension section 1012a satisfies 7.5mm<K<14.5mm, for example, K can be 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, etc. When the type of the component changes, K can also satisfy 9.5mm<K<12.5mm.

[0118] Optionally, refer to Fig.10 When β=90°, the length of the second extension section 1012b is M, 4mm<M<22mm.

[0119] Specifically, based on the above embodiments, Fig.10 As shown, in a type of component, when α=180° and β=90°, if the length M of the second extension section 1012b is less than 4mm, the second extension section 1012b cannot extend outward from the outlet hole 121. If the length M of the second extension section 1012b is greater than or equal to 22mm, the end of the second extension section 1012b is just at the edge or extends from the middle bus bar 11. Therefore, in the embodiment of the present application, the length M of the second extension section 1012b satisfies 4mm<K<22mm, for example, M can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, etc. When the type of the component changes, M can also satisfy 6mm<M<20mm.

[0120] Optionally, refer to Fig.11 , Fig.13 , Fig.14 When 90°<β≤160°, the length of the first extension section 1012a is K, 0mm<K<11.5mm.

[0121] Specifically, on the basis of the above-mentioned embodiment, in a type of component, when α=180°, and 90°<β≤160°, at this time, the first extension section 1012a is inclined relative to the main section 1011, and the second extension section 101b is bent relative to the first extension section 1012a. At least the length K of the first extension section 1012a must be greater than 0. In addition, the length K of the first extension section 1012a is less than 11.5mm, which can prevent the first extension section 1012a from extending too long beyond the middle bus bar 11. 0mm<K<11.5mm can ensure that the vertex of the second angle β is located at one of the three positions on the battery cell 20, between the battery cell 20 and the middle bus bar 11, and on the middle bus bar 11. For example, K can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, etc. When the type of the component changes, M can also meet 6mm<M<20mm.

[0122] like Fig.11 As shown, in a type of assembly, when 2mm<K<6mm, the vertex of the second angle β is located on the battery cell 20. Fig.13 As shown, in a type of assembly, when 6 mm < K < 9.5 mm, the vertex of the second angle β is located between the battery cell 20 and the middle bus bar 11. Fig.14As shown, in one version of the assembly, when 9.5 mm<K<12.5 mm, the vertex of the second angle β is located on the middle bus bar 11 .

[0123] Optionally, refer to Fig.11 When 90°<β≤160°, the distance between the vertex of the second angle β and the end point of the second extension section 1012b in the width direction of the middle bus bar 11 is L1, 4mm<L1<17.5mm.

[0124] Specifically, based on the above embodiments, Fig.11 As shown, in a type of component, when α=180°, and 90°<β≤160°, at this time, the first extension section 1012a extends out obliquely relative to the main section 1011, and the second extension section 101b is bent relative to the first extension section 1012a. The distance between the center of the pad 201 closest to the middle bus bar 11 in the battery string and the end point of the second extension section 1012b in the width direction of the middle bus bar 11 is L1. If L1 is small (for example, less than 4mm), the end point of the second extension section 1012b cannot fall on the middle bus bar 11 and weld it. If L1 is large (for example, greater than 17.5mm), the end point of the second extension section 1012b will exceed the middle bus bar 11, causing waste and unsightly. Therefore, 4mm<L1<17.5mm. For example, L1 may be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, etc. When the version of the component changes, L1 may also satisfy 6 mm < M < 15.5 mm.

[0125] Optionally, refer to Fig.15 , the extension section 1012 includes a third extension section 1012c, a fourth extension section 1012d and a fifth extension section 1012e;

[0126] The third extension section 1012c extends from the center of the pad 201 closest to the middle bus bar 11 in the battery string, and the first angle α is formed between the third extension section 1012c and the main section 1011;

[0127] The fourth extension segment 1012d intersects with the third extension segment 1012c and the fifth extension segment 1012e to form a third angle γ and a fourth angle δ, respectively. The third angle γ and the fourth angle δ are located on the same side of the extension segment, and the first angle α and the third angle γ are located on different sides of the edge interconnection strip.

[0128] The fifth extension section 1012 d extends to the middle bus bar 11 and overlaps with the middle bus bar 11 , and at least a portion of the fifth extension section 1012 e is welded and fixed to the middle bus bar 11 .

[0129] Specifically, if Fig.15 As shown, in one embodiment, the extension section 1012 can also be bent twice to form three sections, specifically including a third extension section 1012c, a fourth extension section 1012d and a fifth extension section 1012e. The third extension section 1012c is connected to the main section 1011, and the third extension section 1012c extends from the center of the pad 201 closest to the middle bus bar 11 in the battery string. After the third extension section 1012c is deflected relative to the main section 1011, a first angle α is formed between the third extension section 1012c and the main section 1011. The fourth extension section 1012d is connected to the end of the third extension section 1012c, and after the fourth extension section 1012d is deflected relative to the third extension section 1012c, a third angle γ is formed between the fourth extension section 1012c and the third extension section 1012c. The fifth extension section 1012e is connected to the end of the fourth extension section 1012d, and after the fifth extension section 1012e is deflected relative to the fourth extension section 1012d, a fourth angle δ is formed between the fifth extension section 1012e and the fourth extension section 1012d. The third angle γ and the fourth angle δ are located on the same side of the extension section, and the first angle α and the third angle γ are located on different sides (as shown in the figure, γ and δ can both be located on the left side of the extension section, and α is located on the right side of the edge interconnection strip). The fifth extension section 1012e extends toward the middle bus bar 11 until it overlaps the middle bus bar 11.

[0130] In this embodiment, based on different combinations of the third angle γ and the fourth angle δ, different shapes of extension segments 1012 can be combined, and the extension segments 1012 of various shapes can all be staggered with the welding area of ​​the middle bus bar 11 to avoid the outlet hole 121. In the extension segments 1012 of various shapes, the vertices of the third angle γ and the fourth angle δ can be located on the battery cell 20, or in the gap between the battery cell 20 and the middle bus bar 11, or on the middle bus bar 11, which is specifically determined by the lengths of the third extension segment 1012c and the fourth extension segment 1012d. The vertex positions of the third angle γ and the fourth angle δ are not limited in the embodiment of the present application.

[0131] Optionally, refer to Fig.16 and Fig.17 , when α=90°, γ=90°, 180°<δ<270°; or,

[0132] When α=90°, 90°<γ<180°, 270°-γ<δ<360°-γ, and δ≠180°.

[0133] Specifically, for the layout shape in which the extension section 1012 includes three sections, in one implementation, when the first angle α=90°, the third extension section 1012 c directly extends from the right side of the pad 201 .

[0134] like Fig.16 As shown in the figure, when the length of the third extension section 1012c is such that the vertex of the third angle γ is just outside the outlet hole 121 when extending along the X direction, the third angle γ can be designed to be 90°, and the fourth extension section 1012d extends downward along the X direction to directly avoid the outlet hole 121.

[0135] like Fig.17 As shown in the figure, when the length of the third extension section 1012c is short, the third angle γ can be designed to be greater than 90° (for example, γ=110°), so that the fourth extension section 1012c extends obliquely to the right, making it easier to avoid the outlet hole 121. Of course, it is easy to understand that if the third angle γ is equal to 180°, it means that the fourth extension section 1012c extends horizontally to the right. Therefore, 90°≤γ<180°, γ can be 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, etc.

[0136] Accordingly, in order to ensure that the layout direction of the fifth extension section 1012e can effectively extend to the middle bus bar 11, the range of the fourth angle δ needs to be controlled. Fig.16 It is easy to understand that when γ=90°, 180°<δ<270° can realize that the fifth extension section 1012e tilts to the right to avoid the outlet hole 121. Fig.17 It is easy to understand that when 90°<γ<180°, 270°-γ<δ<360°-γ can ensure that the fifth extension section 1012e is always tilted to the right relative to the X direction to avoid the outlet hole 121. In addition, in order to prevent the fourth extension section 1012c and the fifth extension section 1012e from coinciding with a straight line, δ≠180°. For example, when γ=120°, 150°<δ<240°, and δ can be 155°, 160°, 165°, 170°, 175°, 180°, 190°, 200°, 210°, 220°, 230°, etc. Figure 16 to Figure 17 The shapes of the extension section 1012 corresponding to different combinations of α, γ, and δ when the above angle range is satisfied are shown respectively. Fig.16 As shown in the figure, α = 90°, γ = 90°, δ = 170°. Fig.17 , α=90°, γ=110°, δ=170°.

[0137] Optionally, refer to Fig.15 , Fig.18 , Fig.19, when 90°<α<180°, α≤γ<180°, 180°-(γ-α)<δ<270°.

[0138] Specifically, in one embodiment, when 90°<α<180°, the third extension section 1012c is inclined relative to the main section 1011. For example, α can be 95°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, etc.

[0139] Combination Fig.15 As shown, it is easy to understand that, in the process of α gradually increasing from 90° to 180°, controlling the third angle γ to be greater than or equal to the first angle α can ensure that the fourth extension section 1012d is tilted to the right compared to the X direction to avoid the outlet hole 121. Obviously, in order to avoid the overlap of the third extension section 1012c and the fourth extension section 1012d, γ needs to be less than 180°.

[0140] Accordingly, in order to ensure that the layout direction of the fifth extension section 1012e can effectively extend to the middle bus bar 11, it is also necessary to control the range of the fourth angle δ.

[0141] 180°-(γ-α)<δ can ensure that the fifth extension section 1012e is always tilted to the right relative to the X direction to avoid the outlet hole 121. In order to prevent the fifth extension section 1012e from tilting upward relative to the Y direction, δ needs to be less than 270°. In addition, no matter how much γ is, it is necessary to avoid the fifth extension section 1012e and the fourth extension section 1012c from coinciding with a straight line, so δ≠180°. Figure 18 to Figure 19 The shapes of the extension section 1012 corresponding to different combinations of α, γ, and δ when the above angle range is satisfied are shown respectively. Fig.18 As shown in the figure, α = 120°, γ = 130°, and δ = 175°. Fig.19 , α=100°, γ=110°, δ=175°.

[0142] Optionally, refer to Fig. 20 , when α=180°, 180°<γ≤270°, 90°≤δ<180°.

[0143] Specifically, in one implementation, when α=180°, the third extension segment 1012c and the main body segment 1011 are on the same straight line.

[0144] Combination Fig. 20As shown in the diagram, it is easy to understand that when γ is less than or equal to 270°, the third extension section 1012c can be tilted to the right to avoid the outlet hole 121. At this time, if γ is less than or equal to 180°, the third extension section 1012c may pass through the outlet hole 121 after extension. Therefore, 180°<γ≤270°, for example, γ can be 190°, 200°, 210°, 220°, 230°, 240°, 250°, 260°, 270°, etc. Similarly, when δ is greater than or equal to 90°, the fifth extension section 1012e can be tilted to the right to avoid the outlet hole 121. At this time, if δ is greater than or equal to 180°, the fifth extension section 1012e may not be able to contact and overlap with the middle bus bar 11 after extension. Therefore, 90°≤δ<180°, for example, δ can be 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, etc.

[0145] Figure 21 to Figure 22 The shapes of the extension section 1012 corresponding to different combinations of α, γ, and δ when the above angle range is satisfied are shown respectively. Fig.21 As shown in the figure, α = 180°, γ = 270°, and δ = 90°. Fig. 22 , α=180°, γ=270°, δ=120°.

[0146] Optionally, refer to Fig.21 , Fig.23 and Fig.24 , the length of the third extension section 1012c is E, 0mm<E<15mm.

[0147] Specifically, based on the above embodiments, Fig.21 As shown, in a type of component, when α=180°, the length E of the third extension section 1012c should be no less than 0mm so that it can extend outward from the center of the pad 201. If the length E of the third extension section 1012c is greater than or equal to 15mm, the end of the third extension section 1012c is just at the edge or extends out of the middle bus bar 11. Therefore, in the embodiment of the present application, the length E of the third extension section 1012c satisfies 0mm<E<15mm, for example, E can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, etc.

[0148] like Fig.21 As shown, in a type of assembly, when 0 mm < E < 6 mm, the vertex of the third angle γ is located on the battery cell 20. Fig.23 As shown, in a type of assembly, when 6mm<E<9.5mm, the vertex of the third angle γ is located between the battery cell 20 and the middle bus bar 11. Fig.24 As shown, in one version of the assembly, when 9.5 mm<K<12.5 mm, the vertex of the third angle γ is located on the middle bus bar 11 .

[0149] Optionally, refer to Fig.21 The distance between the two vertices of the third angle γ and the fourth angle δ in the length direction of the middle bus bar 11 is F, 2mm≤F≤22mm.

[0150] Specifically, based on the above embodiments, Fig.21 As shown, in a type of component, when α=180°, along the length direction of the middle bus bar 11 (i.e., the Y direction shown in the figure), if the distance F between the two vertices of the third angle γ and the fourth angle δ in the length direction of the middle bus bar 11 (i.e., the Y direction shown in the figure) is too small (e.g., less than 2 mm), the end of the fifth extension section 1012e may still be within the outlet hole 121, and if the above distance F is too large (e.g., greater than 22 mm), the end of the fifth extension section 1012e may exceed the middle bus bar 11. Therefore, in the embodiment of the present application, 2mm≤F≤22mm. For example, F can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, etc.

[0151] Optionally, refer to Fig.21 The distance between the vertex of the fourth angle δ and the end point of the fifth extension section 1012e in the width direction of the middle bus bar 11 (ie, the X direction shown in the figure) is G, 0mm<G<15mm.

[0152] Specifically, based on the above embodiments, Fig.21 As shown, in a type of component, when α=180°, if the distance G between the vertex of the fourth angle δ and the end point of the fifth extension section 1012e in the width direction of the middle bus bar 11 (i.e., the X direction shown in the figure) is 0, it means that the fifth extension section 1012e extends horizontally to the right. At this time, if G is short, it is not possible to ensure that the vertex of the third angle γ is on the middle bus bar 11, and it is obviously impossible to achieve welding of the extension section 1012 and the middle bus bar 11. Therefore, G should be greater than 0mm. In addition, if the above distance G is too large (for example, greater than 15mm), the end of the fifth extension section 1012e may exceed the middle bus bar 11. Therefore, in the embodiment of the present application, 0mm<G<15mm. For example, G can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, etc.

[0153] Optionally, the battery cell 20 includes a 0BB battery cell or a MBB battery cell.

[0154] Specifically, the cell 20 used in the embodiment of the present application can be a traditional MBB cell, that is, a multi-grid cell. Correspondingly, the edge interconnection bar 101 involved in the aforementioned embodiment corresponds to the edge main grid position welded on the multi-grid cell, and the edge main grid is the main grid closest to the side of the cell on the multi-grid cell. In addition, the cell 20 used in the embodiment of the present application can also be a 0BB cell with fewer or even zero main grids, which is called a busbar-free cell. Whether it is a 0BB cell or an MBB cell, the yield of the photovoltaic module obtained by string welding using the edge interconnection bar 101 can be improved in accordance with the method disclosed in the aforementioned embodiment.

[0155] Optionally, the battery cell 20 includes a back contact battery.

[0156] Specifically, taking a main grid cell as an example, the cell 20 of the embodiment of the present application can be a back contact cell in which the positive main grid, the negative main grid, the positive fine grid, and the negative fine grid are all distributed on the backlight side of the cell. The back contact cell has a higher conversion efficiency because the front side is unobstructed, so that the photovoltaic module has a higher power.

[0157] Optionally, the battery cell 20 is an n-slice battery, where n is a positive integer not less than 2.

[0158] Specifically, the cell 20 used for string welding to form a cell string in the photovoltaic module of the embodiment of the present application can be a complete square or rectangular cell that is cut to form a half-cell, three-cell, four-cell or eight-cell cell, etc., so as to meet the electrical performance requirements of different types of components.

[0159] Optionally, the length of one side of the battery cell 20 is within the range of 94±3 mm, and the length of the other side of the battery cell 20 is within the range of 182.2±5 mm.

[0160] Specifically, in various embodiments of the present application, the battery cell 20 may be a half-cell battery formed by cutting a full rectangular battery cell with four chamfered corners. The length direction of the half-cell battery cell 20 in the embodiment of the present application is also the length direction of the whole battery cell before cutting, and the width direction of the half-cell battery cell 20 is also the width of the whole battery cell before cutting.

[0161] The length of the half-cell shaped battery cell 20 can be 91 mm, 92 mm, 93 mm, 94 mm, 95 mm, 96 mm, 97 mm. For example, when a half-cell cell is obtained by cutting a whole cell cell with a length of 188 mm, the length of the battery cell 10 can be 94 mm.

[0162] Specifically, a battery cell that is too long (for example, greater than 97 mm) is not conducive to process manufacturing, and a battery cell that is too short (for example, less than 91 mm) will result in a lower power of the battery cell.

[0163] Based on the above, the length of the battery cell is between 91mm and 97mm, which can reduce the difficulty of the process and ensure the power of the component.

[0164] In addition, the width of the half-cell shaped battery cell 20 can be 177.2 mm, 178.2 mm, 179.2 mm, 180.2 mm, 182.2 mm, 185.2 mm, 187.2 mm. For example, when a full-cell battery cell with a width of 182.2 mm is cut to obtain a half-cell battery cell, the width of the battery cell 20 remains unchanged at 182.2 mm.

[0165] Specifically, a battery cell width that is too large (for example, greater than 187.2 mm) is not conducive to process manufacturing, and a battery cell width that is too small (for example, less than 177.2 mm) will result in a lower power of the battery cell.

[0166] Based on the above, the width of the battery cell is between 177.2mm and 187.2mm, which can reduce the difficulty of the process and ensure the power of the component.

[0167] Optionally, the battery cell 20 has a thickness of 100 um to 300 um.

[0168] Specifically, the thickness of the cell 20 used in the photovoltaic module of the embodiment of the present application can be 100um, 150um, 180um, 220um, 250um or 300um. In some types of modules, the thickness of the solar cell can be 120um to 180um, specifically 120um, 134um, 153um or 179um. Thus, the cell 20 can have both lightness and structural strength.

[0169] Optionally, the entire length of the battery cell 20 before being sliced ​​is 150 mm to 300 mm.

[0170] Specifically, the length of the whole cell sheet before cutting and slicing corresponding to the cell sheet 20 in the photovoltaic module of the embodiment of the present application can be 150mm to 300mm, specifically 156.75mm, 158.75mm, 166mm, 182mm, and 210mm. The cell sheet 20 obtained by cutting the whole cell sheet of this size range helps to make full use of the surface area of ​​the existing components, has a relatively high proportion, and can output a higher power generation power.

[0171] Optionally, the cell 20 of the embodiment of the present application may include one of a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell or a multi-compound solar cell. The multi-compound solar cell may specifically be a cadmium sulfide solar cell, a gallium arsenide solar cell, a copper indium selenide solar cell or a perovskite solar cell. These different types of solar cells have different photoelectric conversion performances and can be adapted to different places of use.

[0172] Optionally, a plurality of main grids are arranged on each of the battery cells 20 , and the number of welding pads arranged on each main grid is greater than 7 and less than 20.

[0173] Specifically, in the embodiment of the present application, the number of pads corresponding to the main grid on the battery cell 20 can be 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20, etc. The more pads on a single main grid, the more reliable the welding, but it will increase the cost. Based on the above, the number of pads on the main grid of the present application can take into account both welding reliability and cost reduction. For example, the number of pads can be 9.

[0174] Optionally, the number of main grids provided on each of the battery cells 20 is greater than 7 and less than 30.

[0175] Specifically, in the embodiment of the present application, the number of busbars on the battery cell 20 can be between 7 and 30. For example, the number of busbars can be 7, 8, 10, 12, 14, 16, 18, 20, etc., and the number of positive busbars and negative busbars can be equal. The more busbars there are on the battery cell 20, the better the current collection performance, but it will lead to increased costs. Based on the above, the number of busbars in the embodiment of the present application can take into account both current collection performance and cost reduction. For example, the number of busbars can be 18.

[0176] Optionally, the width of the main grid is 40um to 80um.

[0177] Specifically, in the embodiment of the present application, the width of the main grid on the battery cell 20 can be 40um, 50um, 60um, 70um or 80um. For example, for a battery cell with a length of 210mm, the width of the main grid is 50um to 60um, and can be 50um, 53um, 56um or 60um. The width of the main grid within this range can take into account the current collection performance and avoid excessive area blocking.

[0178] Optionally, the number of fine grids arranged on each of the battery cells 20 is greater than 100 and less than 250.

[0179] Specifically, the number of fine grids on the battery cell 20 in the embodiment of the present application can be 100, 110, 120, 130, 140, 150, 160, 170, or 180. In some versions of the components, the number of fine grid lines is 140 to 180, specifically 148, 150, 156, 166, 171, 178, or 180. The number of fine grids in the embodiment of the present application can take into account both current collection performance and cost reduction.

[0180] Optionally, the width of the fine grid is 20um to 60um.

[0181] Specifically, in the embodiment of the present application, the width of the fine grid on the battery cell 20 can be 20um, 30um, 40um, 50um or 60um. In some types of components, the width of the fine grid is 20um to 40um, and can be 23um, 26um, 34um or 39um. The width of the fine grid within this range can take into account the current collection performance and avoid excessive area blocking.

[0182] Optionally, the length of the photovoltaic module is 1700 mm to 2500 mm.

[0183] Specifically, the length of the photovoltaic assembly in the embodiment of the present application can be 1700mm~1740mm, for example, the length can be 1700mm, 1710mm, 1720mm, 1725mm, 1730mm, 1740mm. The length of the photovoltaic assembly in the embodiment of the present application can be 1741mm~1780mm, for example, the length can be 1741mm, 1748mm, 1760mm, 1769mm, 1774mm, 1780mm. The length of the photovoltaic assembly in the embodiment of the present application can also be 1781mm~1820mm, for example, the length can be 1781mm, 1787mm, 1799mm, 1800mm, 1810mm, 1820mm. The length of the photovoltaic assembly in the embodiment of the present application can also be 1971mm~2020mm, for example, the length can be 1971mm, 1977mm, 1980mm, 2005mm, 2016mm, 2020mm. In the embodiment of the present application, the length of the photovoltaic assembly can also be 2161mm to 2210mm, for example, the length can be 2161mm, 2167mm, 2180mm, 2196mm, 2200mm, 2210mm. In the embodiment of the present application, the length of the photovoltaic assembly can also be 2361mm to 2400mm, for example, the length can be 2361mm, 2367mm, 2375mm, 2380mm, 2395mm, 2400mm. In the embodiment of the present application, the length of the photovoltaic assembly can be 2400mm to 2500mm, for example, the length can be 2400mm, 2410mm, 2420mm, 2430mm, 2440mm, 2450mm, 2460mm, 2470mm, 2480mm, 2490mm, 2500mm.

[0184] Optionally, the width of the photovoltaic module is 1100 mm to 1200 mm.

[0185] Specifically, the width of the photovoltaic module in the embodiment of the present application can be 1100mm, 1110mm, 1120mm, 1125mm, 1130mm, 1131mm, 1132mm, 1133mm, 1134mm, 1135mm, 1136mm, 1137mm, 1138mm, 1139mm, 1140mm, 1145mm, 1150mm, 1160mm, 1170mm, 1180mm, 1190mm, and 1200mm.

[0186] Components that meet the above length and width dimensions have a more suitable area size and are easier to transport and install. When installed and fixed on a building, they can reduce the risk of wind uplift caused by the overall component size being too large, and avoid insufficient power generation caused by the overall component size being too small.

[0187] The embodiments of the present application also provide a photovoltaic system, which may use multiple photovoltaic modules as described in the aforementioned embodiments. Multiple photovoltaic modules may be installed on the roof of a building to form a distributed photovoltaic power generation system.

[0188] Specifically, the photovoltaic modules can be fixed to the building by using adhesive with strong adhesion and excellent weather resistance, or by using connectors such as a pressing block assembly used in conjunction with the photovoltaic module frame, or by using a hanger fastener used in conjunction with the photovoltaic module frame to mount the photovoltaic module on the wall of the building. The appropriate installation structure can be selected according to the actual construction conditions.

[0189] Based on the above, it can be seen that the photovoltaic system can take into account conversion efficiency, cost, building matching and stability and reliability.

[0190] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0191] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic module includes an interconnection bar, an intermediate bus bar and a back sheet; The interconnection bar welds a plurality of battery cells in series to form a battery string, and the interconnection bar is welded to the middle bus bar located at the end of the battery string; the battery cell is provided with an edge interconnection bar, the back plate is provided with a wire outlet hole, and the wire outlet hole is located between two middle bus bars, and on at least one battery cell surrounding the wire outlet hole, an edge interconnection bar adjacent to the wire outlet hole includes a main section and an extension section; The main body section is entirely located on the battery cell, and the main body section is fixed to each pad on the battery cell by welding; The extension section extends from the pad closest to the middle bus bar in the battery cell to the middle bus bar, overlaps with the middle bus bar, and at least the portion of the extension section outside the outlet hole is welded and fixed to the middle bus bar.

2. The photovoltaic module according to claim 1, characterized in that: The main section and the extension section have a smooth arc transition or a first angle α, 90°≤α≤180°.

3. The photovoltaic module according to claim 2, characterized in that: The extension section includes a first extension section and a second extension section; The first extension section extends from the center of the pad closest to the middle bus bar in the battery string, and the first extension section forms the first angle α with the main section; The second extension section extends toward the middle bus bar, the second extension section intersects with the first extension section to form a second angle β, and the first angle α and the second angle β are located on the same side of the edge interconnection bar; The second extension section overlaps the middle bus bar, and at least a portion of the second extension section is fixed to the middle bus bar by welding.

4. The photovoltaic module according to claim 3, characterized in that: When α=90°, 250°≤β≤290°.

5. The photovoltaic module according to claim 3, characterized in that: When 90°<α<180°, 270°-α≤β≤360°-α.

6. The photovoltaic module according to claim 3, characterized in that: When α=180°, 90°≤β≤160°.

7. The photovoltaic module according to claim 6, characterized in that: When β=90°, the length of the first extension section is K, 7.5 mm<K<14.5 mm; and / or, When β=90°, the length of the second extension section is M, 4mm<M<22mm.

8. The photovoltaic module according to claim 6, characterized in that: When 90°<β≤160°, the length of the first extension section is K, 0mm<K<11.5mm; and / or, When 90°<β≤160°, the distance between the vertex of the first angle α and the end point of the second extension section in the width direction of the middle bus bar is L1, 4mm<L1<17.5mm.

9. The photovoltaic module according to claim 2, characterized in that: The extension segment includes a third extension segment, a fourth extension segment and a fifth extension segment; The third extension section extends from the center of the pad closest to the middle bus bar in the battery string, and the first angle α is formed between the third extension section and the main section; The fourth extension segment intersects with the third extension segment and the fifth extension segment to form a third angle γ and a fourth angle δ, respectively. The third angle γ and the fourth angle δ are located on the same side of the extension segment, and the first angle α and the third angle γ are located on different sides of the edge interconnection strip. The fifth extension section extends to the middle bus bar and overlaps with the middle bus bar, and at least a portion of the fifth extension section is welded and fixed to the middle bus bar.

10. The photovoltaic module according to claim 9, characterized in that: When α=90°, γ=90°, 180°<δ<270°; or, When α=90°, 90°<γ<180°, 270°-γ<δ<360°-γ, and δ≠180°.

11. The photovoltaic module according to claim 9, characterized in that: When 90°<α<180°, α≤γ<180°, 180°-(γ-α)<δ<270°, and δ≠180°.

12. The photovoltaic module according to claim 9, characterized in that: When α=180°, 180°<γ≤270°, 90°≤δ<180°.

13. The photovoltaic module according to claim 12, characterized in that: The length of the third extension section is E, 0mm<E<15mm; and / or, The distance between the two vertices of the third angle γ and the fourth angle δ in the length direction of the middle bus bar is F, 2mm≤F≤22mm; and / or, The distance between the vertex of the fourth angle δ and the end point of the fifth extension section in the width direction of the middle bus bar is G, 0mm<G<15mm.

14. The photovoltaic module according to any one of claims 1 to 13, characterized in that: The battery cell includes an 0BB battery cell or an MBB battery cell.

15. The photovoltaic module according to any one of claims 1 to 13, characterized in that: The cell sheet includes a back contact cell.

16. The photovoltaic module according to any one of claims 1 to 13, characterized in that: The battery cell is an n-piece battery, where n is a positive integer not less than 2; and / or, The length of one side of the battery cell is within the range of 94±3 mm, and the length of the other side of the battery cell is within the range of 182.2±5 mm; and / or, The thickness of the battery cell is 100um to 300um; and / or, The length of the whole cell before being cut into pieces is 150 mm to 300 mm; and / or, The cell sheet includes one of a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell or a multi-compound solar cell.

17. The photovoltaic module according to any one of claims 1 to 13, characterized in that: Each of the solar cells is provided with a plurality of main grids, and the number of the welding pads provided on each main grid is greater than 7 and less than 20; and / or, The number of main grids provided on each of the solar cells is more than 7 and less than 30; and / or, The width of the main grid is 40um to 80um; and / or, The number of fine grids arranged on each of the solar cells is more than 100 and less than 250; and / or, The width of the fine grid is 20um to 60um.

18. The photovoltaic module according to any one of claims 1 to 13, characterized in that: The length of the photovoltaic module is 1700 mm to 2500 mm; and / or, The width of the photovoltaic module is 1100 mm to 1200 mm.

19. A photovoltaic system, characterized in that: A plurality of photovoltaic modules according to any one of claims 1 to 18 arranged in an array.

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