A solar cell module and photovoltaic system

Abstract

This invention relates to the field of solar cell technology, specifically disclosing a solar cell module and photovoltaic system. The module includes: a cell string, including an edge cell string; an edge busbar, which is disposed on the same side edge of the module in a second direction, and extends along the second direction; and an edge busbar solder strip for electrically connecting the edge cell string and the edge busbar, the solder strip including a main body section and a bent section, the main body section extending along a first direction, and the bent section disposed on the side of the main body section near the edge busbar. On the cells in the edge cell string, the end near the corresponding side edge of the module in the second direction is the edge end, and the bent section is bent in the second direction away from the edge end. This invention can effectively reduce the risk of microcracks in the edge region of the module, improve the encapsulation effect, and thus improve the production yield and long-term reliability of the module.

Description

Technical Field

[0001] This invention relates to the field of solar cell technology, and more particularly to a solar cell module and photovoltaic system. Background Technology

[0002] In existing technologies, battery modules typically include a solar module and a frame surrounding the solar module. The solar module includes a battery string, a front encapsulation layer on the front of the battery string, and a back encapsulation layer on the back of the battery string. During assembly, transportation, and long-term use, the edge areas of the battery string near the frame are more prone to stress concentration issues compared to the central area, especially in the stacked connection area between the edge busbar and the edge solder strip closest to the frame. This area is prone to microcracks and can also cause bubbles, edge gaps, and delamination at the edges of the front and back encapsulation layers, affecting the encapsulation effect, reducing the production yield of existing battery modules, and resulting in poor long-term reliability. Summary of the Invention

[0003] The purpose of this invention is to provide a solar cell module and photovoltaic system in response to the existing technological status quo.

[0004] This invention can effectively reduce the risk of microcracks in the edge area of ​​battery modules, reduce the interference of the connection between the edge busbar and the edge busbar on the encapsulation effect of the encapsulation layer, improve the encapsulation effect, and thus improve the production yield and long-term reliability of battery modules.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] First, the present invention provides a solar cell module, comprising:

[0007] A battery string, comprising a plurality of interconnected battery cells arranged along a first direction, and the battery string including an edge battery string;

[0008] An edge busbar is connected in series with the edge battery on the same side edge of the battery assembly in a second direction. The edge busbar extends along the second direction, and the first direction and the second direction intersect each other.

[0009] An edge busbar is used to electrically connect the edge battery string to the edge busbar. The edge busbar includes a main body segment and a bent segment arranged along a first direction. The main body segment extends along the first direction, and the bent segment is located on the side of the main body segment close to the edge busbar.

[0010] On the battery cells in the edge battery string, one end near the corresponding side edge of the battery assembly in the second direction is the edge end, and the bent segment is bent in the second direction away from the edge end.

[0011] In some embodiments, in the second direction, the bending segment includes an offset segment and a parallel segment arranged sequentially away from the main body segment, the line connecting the two ends of the offset segment in the first direction forms an angle with the first direction, and the parallel segment is arranged along the first direction.

[0012] In some embodiments, in the second direction, the distance between the projection of the bent segment on the edge busbar and the edge end is 4mm to 22mm.

[0013] In some embodiments, the battery assembly further includes a series bonding strip for connecting adjacent battery cells in the same battery string in series, the series bonding strip extending along a first direction;

[0014] The edge battery string includes a first battery cell, the main body segment is disposed on the first battery cell, and the main body segment and the serial welding strip are arranged alternately along the second direction on the first battery cell;

[0015] In the second direction, when the solder strip closest to the edge end on the first battery cell is the serial solder strip, the distance between the projection of the bent section on the edge busbar and the edge end is 10mm~22mm.

[0016] In the second direction, when the solder strip closest to the edge end on the first battery cell is the edge busbar solder strip, the distance between the projection of the bent segment on the edge busbar and the edge end in the second direction is 4mm~12mm.

[0017] In some embodiments, the edge battery string includes a first battery cell and a second battery cell arranged adjacent to each other, with the first battery cell disposed at one end of the edge battery string in a first direction, the edge busbar disposed on the back side of the second battery cell, and an insulating member disposed between the edge busbar and the back side of the second battery cell.

[0018] In some embodiments, the battery cell includes a plurality of fine grids and a plurality of end busbars. The fine grids extend along a second direction and the plurality of fine grids are arranged along a first direction. The end busbars are disposed on both sides of the battery cell in the first direction. The end busbars extend along the first direction and the plurality of end busbars are arranged along the second direction. The same end busbar connects to a plurality of fine grids of the same polarity.

[0019] The battery assembly further includes series bonding strips for connecting adjacent battery cells in the same battery string. The series bonding strips extend along a first direction, and a plurality of series bonding strips are arranged along a second direction.

[0020] The series solder strip is electrically connected to the end busbar of the same polarity that is adjacent to it in the second direction; the two ends of the series solder strip in the first direction are provided with solder strip ends, and on the same side of the cell in the first direction, the distance from the first edge to the adjacent end busbar in the first direction is less than the distance from the solder strip end to the first edge in the first direction; the first edge is the edge of the cell where the solder strip end is located that is closest to the solder strip end in the first direction.

[0021] In some embodiments, in a first direction, the edge busbar is disposed on the side of the second battery cell close to the first battery cell; and in a second direction, the projection of the edge busbar on the second battery cell overlaps with the end busbar on the second battery cell, and the projection of the bent section on the second battery cell is offset from the end busbar on the second battery cell.

[0022] In some embodiments, the end busbars include a first end busbar and a second end busbar with opposite polarities, the first end busbar and the second end busbar being staggered in a second direction, and in the second direction, the projection of the bent segment onto the second solar cell is located between the first end busbar and the second end busbar on the second solar cell, wherein...

[0023] On the second solar cell, the distance between the projection of the bent segment and the first end busbar closest to the bent segment in the second direction is 3mm to 8mm; and / or,

[0024] On the second battery cell, the distance between the projection of the bent section and the second end busbar closest to the bent section in the second direction is 1mm to 4mm.

[0025] In some embodiments, in the second direction, the projection of the bent segment onto the second solar cell is offset from the series bonding strip on the second solar cell; and / or,

[0026] In the second direction, the serial solder strips on the second cell are staggered from the end busbars.

[0027] In some embodiments, the serial bonding strip includes a first serial bonding strip and a second serial bonding strip, the first serial bonding strip and the second serial bonding strip are staggered in a first direction, and the first serial bonding strip and the second serial bonding strip are staggered in a second direction. On the second solar cell, the polarity of the fine grid connected to the first serial bonding strip is the same as the polarity of the bent section.

[0028] On the second solar cell, the distance between the projection of the bent segment and the first series weld strip closest to the bent segment in the second direction is 2mm to 7mm; and / or,

[0029] On the second cell, the distance between the projection of the bent section and the second serial welding strip closest to the bent section in the second direction is 1mm to 4mm.

[0030] In some embodiments, the serial bonding strips include a first serial bonding strip and a second serial bonding strip, the first and second serial bonding strips being staggered in a first direction and in a second direction, wherein on the second solar cell, the fine grid connected to the first serial bonding strip, the first end busbar, and the bent section have the same polarity.

[0031] On the second cell, the first series solder strip is electrically connected to the first end busbar closest to the first series solder strip, and the distance between the two is 0.2mm to 2mm.

[0032] In some embodiments, within the same battery cell, a pad point for electrically connecting the series solder strip and its adjacent end busbar of the same polarity is provided, and in a second direction, the centerline of the pad point is offset from the end busbar to which it is connected.

[0033] In some embodiments, the battery string further includes a secondary edge battery string, which is disposed adjacent to the edge battery string in a second direction;

[0034] Secondary edge bus solder strip A is used to electrically connect the secondary edge battery string and the edge bus. The secondary edge bus solder strip A includes a base segment A and a bend segment A. The base segment A extends along a first direction, and the bend segment A is located on the side of the base segment close to the edge bus.

[0035] In the second direction, the bending segment has the same or opposite bending direction as the turning segment A.

[0036] In some embodiments, the battery assembly further includes a series bonding strip for connecting adjacent battery cells in the same battery string;

[0037] The battery cell includes a third battery cell disposed in the sub-edge battery string, and the first battery cell and the third battery cell are disposed adjacent to each other in a second direction;

[0038] On the first battery cell, the edge busbar and the series solder strip are arranged alternately along the second direction; on the third battery cell, the secondary edge busbar A and the series solder strip are arranged alternately along the second direction.

[0039] In the second direction, the first battery cell has a first end solder strip on the side near the secondary edge battery string, and the third battery cell has a second end solder strip on the side near the edge battery string. The first end solder strip and the second end solder strip are arranged adjacent to each other.

[0040] When the first end solder strip is the edge busbar solder strip and the second end solder strip is the series solder strip, the bending direction of the bending section is opposite to that of the bend section A;

[0041] When the first end weld strip is the edge busbar weld strip and the second end weld strip is the secondary edge busbar weld strip A, the bending direction of the bending section is the same as that of the turning section A;

[0042] When the first end solder strip is the serial solder strip and the second end solder strip is the secondary edge busbar solder strip A, the bending direction of the bending section is the same as that of the turning section A;

[0043] When the first end weld strip is the serial weld strip and the second end weld strip is the serial weld strip, the bending direction of the bending section is opposite to that of the turning section A.

[0044] In some embodiments, the battery string further includes a secondary edge battery string, which is disposed adjacent to the edge battery string in a second direction;

[0045] The secondary edge busbar is disposed adjacent to the edge busbar in the second direction.

[0046] The secondary edge busbar B is used to electrically connect the secondary edge battery string and the secondary edge busbar. The secondary edge busbar B includes a base section B and a bend section B. The base section B extends along a first direction, and the bend section B is located on the side of the base section B close to the edge busbar.

[0047] In the second direction, the bending segment has the same or opposite bending direction as the turning segment B.

[0048] In some embodiments, the battery assembly further includes a series bonding strip for connecting adjacent battery cells in the same battery string;

[0049] The battery cell includes a fourth battery cell disposed in the sub-edge battery string, and the first battery cell and the fourth battery cell are disposed adjacent to each other in a second direction;

[0050] On the first battery cell, the edge busbar and the series solder strip are arranged alternately along the second direction; on the fourth battery cell, the secondary edge busbar B and the series solder strip are arranged alternately along the second direction.

[0051] In the second direction, the first battery cell has a first end solder strip on the side near the secondary edge battery string, and the fourth battery cell has a second end solder strip on the side near the edge battery string. The first end solder strip and the second end solder strip are arranged adjacent to each other.

[0052] When the first end solder strip is the edge busbar solder strip and the second end solder strip is the series solder strip, the bending direction of the bending section is opposite to that of the bend section B;

[0053] When the first end weld strip is the edge busbar weld strip and the second end weld strip is the secondary edge busbar weld strip B, the bending direction of the bending section is the same as that of the turning section B.

[0054] When the first end solder strip is the serial solder strip and the second end solder strip is the secondary edge busbar solder strip B, the bending direction of the bending section is the same as that of the turning section B.

[0055] When the first end weld strip is the serial weld strip and the second end weld strip is the serial weld strip, the bending direction of the bending section is opposite to that of the turning section B.

[0056] Secondly, the present invention also provides a photovoltaic system, including the aforementioned solar cell module.

[0057] The beneficial effects of this invention are as follows:

[0058] Compared to the conventional use of a straight solder strip, this application sets the connection between the edge busbar and the edge busbar as a bent section, and the bent section bends in the second direction away from the edge end. This allows the connection between the edge busbar and the edge busbar to be located further away from the edge of the battery module in the second direction. This effectively avoids the microcrack problem that is easily caused by the stacked connection area between the edge busbar closest to the frame and the edge solder strip closest to the frame being located in the edge area of ​​the battery module. It reduces the risk of microcracks in the edge area of ​​the battery module, reduces the interference of the connection between the edge busbar and the edge busbar on the encapsulation effect of the encapsulation layer, improves the encapsulation effect, and thus improves the production yield and long-term reliability of the battery module. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the structure of a solar cell module according to an embodiment of the present invention.

[0060] Figure 2 for Figure 1 A magnified view of part A.

[0061] Figure 3 for Figure 1 A magnified view of part B.

[0062] Figure 4 This is a partial enlarged view of the edge battery string in an embodiment of the present invention.

[0063] Figure 5 This is a partially enlarged view of the battery assembly according to an embodiment of the present invention.

[0064] Figure 6 This is a schematic diagram of the structure of the second battery cell according to an embodiment of the present invention.

[0065] Figure 7 This is a schematic diagram of the structure at the end busbar of a battery assembly according to one embodiment of the present invention.

[0066] Figure 8 This is a schematic diagram of the structure of the end busbar of the battery assembly in a second embodiment of the present invention.

[0067] Figure 9 This is a schematic diagram of the structure of the end busbar of the battery assembly in Embodiment 3 of the present invention.

[0068] Figure 10 This is a schematic diagram of the structure of the intermediate busbar of a battery assembly according to one embodiment of the present invention.

[0069] Figure 11 This is a schematic diagram of the structure of the middle busbar of the battery assembly in Embodiment 2 of the present invention.

[0070] Figure 12 This is a schematic diagram of the structure of the intermediate busbar of the battery assembly in Embodiment 3 of the present invention.

[0071] In the picture:

[0072] Battery string 1, edge battery string 11, first battery cell 111, first battery cell A111A, first battery cell B111B, second battery cell 112, second battery cell A112A, second battery cell B112B, secondary edge battery string 12, third battery cell 121, fourth battery cell 122.

[0073] Edge busbar 2, end busbar 2A, middle busbar 2B;

[0074] Edge busbar 3, first edge busbar 3A, second edge busbar 3B, main body section 31, bending section 32, offset section 321, parallel section 322;

[0075] Insulating component 4;

[0076] Series welding strip 5, first series welding strip 51, second series welding strip 52;

[0077] Sub-edge busbar A61, base section A611, bend section A612;

[0078] Sub-edge busbar welding strip B62, base section B621, bend section B622;

[0079] Fine grid 71, first fine grid 711, second fine grid 712, end bus line 72, first end bus line 721, second end bus line 722, first edge 73, pad point 74, edge end 75;

[0080] Sub-edge bus 8. Detailed Implementation

[0081] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the invention, and should not be construed as limiting the invention. Furthermore, it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0082] In the description of this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" or "a number" means two or more, unless otherwise explicitly specified.

[0083] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0084] In the description of this invention, unless otherwise expressly specified and limited, the term "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them.

[0085] It is understood that busbars (e.g., edge busbar 2, sub-edge busbar 8, etc.) and solder strips (e.g., edge busbar solder strip 3, sub-edge busbar solder strip, series solder strip 5, etc.) themselves do not have polarity. In this invention, for ease of description, the polarity of busbars, solder strips, etc. refers to their polarity on a certain battery cell. The polarity of busbars, solder strips, etc. on a certain battery cell is consistent with the polarity of the grid lines collected on that battery cell. Correspondingly, their opposite-polarity grid lines are grid lines with the opposite polarity to the grid lines collected on that battery cell. For example, a certain busbar... If a grid line on a battery cell is electrically connected to the positive electrode, then the polarity of the busbar on that battery cell is positive, and correspondingly, its opposite-polarity grid line is the negative electrode grid line. For example, if a solder ribbon is electrically connected to the positive electrode grid line on a battery cell, and electrically connected to the negative electrode grid line on an adjacent battery cell, then the polarity of the solder ribbon on that battery cell is positive, and correspondingly, its opposite-polarity grid line on that battery cell is the negative electrode grid line. The polarity on the adjacent battery cell is negative, and correspondingly, its opposite-polarity grid line on the adjacent battery cell is the positive electrode grid line.

[0086] First, see Figures 1 to 3 As shown, an embodiment of the present invention discloses a solar cell module, comprising:

[0087] Battery string 1 has a plurality of battery cells connected in series along a first direction, and battery string 1 includes edge battery string 11.

[0088] Edge busbar 2, edge busbar 2 and edge battery string 11 are located on the same side edge of the battery assembly in the second direction. Edge busbar 2 extends along the second direction and the first direction and the second direction intersect each other.

[0089] Edge busbar 3 is used to electrically connect edge battery string 11 and edge busbar 2. Edge busbar 3 includes a main body section 31 and a bent section 32 arranged along a first direction. The main body section 31 extends along the first direction, and the bent section 32 is located on the side of the main body section 31 close to the edge busbar 2.

[0090] On the cell in the edge battery string 11, the end near the corresponding side edge of the battery assembly in the second direction is the edge end 75, and the bent section 32 is bent in the second direction away from the edge end 75.

[0091] Compared to the conventional use of a straight solder strip, in this application, the connection between the edge busbar 3 and the edge busbar 2 is set as a bent section 32, and the bent section 32 is bent in the second direction away from the edge end 75. This allows the connection between the edge busbar 3 and the edge busbar 2 to be located further away from the edge of the battery module in the second direction. This effectively avoids the problem of microcracks that are easily caused by the stacked connection area between the edge busbar closest to the frame and the edge solder strip closest to the frame being located in the edge area of ​​the battery module. This reduces the risk of microcracks in the edge area of ​​the battery module, reduces the interference of the connection between the edge busbar 3 and the edge busbar 2 on the encapsulation effect of the encapsulation layer, improves the encapsulation effect, and thus improves the production yield and long-term reliability of the battery module.

[0092] In some embodiments, an edge busbar 3, an edge busbar 2, and an edge battery string 11 are provided on either side of the second direction of the battery module. Preferably, an edge busbar 3, an edge busbar 2, and an edge battery string 11 are provided on both sides of the second direction of the battery module to ensure that the electrical connection positions of the edge busbar 2 and the edge busbar 3 on both sides of the battery module can be further away from the edge of the battery module, reducing the risk of microcracks, improving the edge encapsulation effect, and improving the production yield and long-term reliability of the battery module.

[0093] Understandably, electrical connections can be made by welding, bonding with conductive adhesive, etc., but are not limited to these methods.

[0094] It is understandable that in battery string 1, battery string 1 may include two battery cells connected in series, three battery cells connected in series, or other numbers of battery cells. The specific number of battery cells to be connected in series can be determined according to the actual use.

[0095] In some embodiments, see Figure 1 and Figure 2 As shown, in the second direction, the bending segment 32 includes an offset segment 321 and a parallel segment 322 arranged sequentially away from the main body segment 31. The line connecting the two ends of the offset segment 321 in the first direction forms an angle with the first direction, and the parallel segment 322 is arranged along the first direction.

[0096] It is understandable that the line connecting the two ends of the offset segment 321 in the first direction forms an angle with the first direction, which means that the angle between the line connecting the two ends of the offset segment 321 in the first direction and the first direction is not zero, that is, the line connecting the two ends of the offset segment 321 in the first direction is not parallel to the first direction.

[0097] Understandably, since the bent segment 32 bends in the direction away from the edge end 75 in the second direction, the offset segment 321 is arranged in sequence at one end near the main body segment 31 and the offset segment 321 is arranged at one end near the parallel segment 322 in the second direction away from the edge end 75.

[0098] In some embodiments, the offset segment 321 can be a linear structure composed of segments such as inclined straight lines and curved lines. For example, it can be composed of multiple inclined straight line segments, multiple curved line segments, or at least one inclined straight line segment and at least one curved line segment. Preferably, the offset segment 321 includes an inclined straight line segment, a first curved line segment, and a second curved line segment. The first curved line segment is located between the main body segment 31 and the inclined straight line segment, and the second curved line segment is located between the parallel segment 322 and the inclined straight line segment.

[0099] In some embodiments, see Figure 4 As shown, in the second direction, the distance W1 between the projection of the bent section 32 on the edge confluence member 2 and the edge end 75 is 4mm~22mm.

[0100] For example, W1 can be 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm, but is not limited thereto.

[0101] Understandably, edge 75 here refers to the edge of the non-beveled area of ​​the battery cell, that is, the edge of the battery cell parallel to the first direction.

[0102] If the distance W1 between the projection of the bent section 32 on the edge busbar 2 and the edge end 75 is too small, it can easily affect the reduction of the risk of microcracks and the improvement of the encapsulation effect.

[0103] In some embodiments, the battery assembly further includes a series bonding strip 5, which is used to connect adjacent battery cells in the same battery string in series, and the series bonding strip 5 is provided to extend along a first direction.

[0104] The edge battery string 11 includes a first battery cell 111, a main body segment 31 disposed on the first battery cell 111, and the main body segment 31 and the series welding strip 5 are arranged alternately along the second direction on the first battery cell 111.

[0105] In the second direction, when the solder strip closest to the edge end 75 on the first battery cell 111 is a series solder strip 5, the distance between the projection of the bent section 32 on the edge busbar 2 and the edge end 75 is 10mm~22mm.

[0106] In the second direction, when the solder strip closest to the edge end 75 on the first battery cell 111 is the edge busbar solder strip 3, the distance between the projection of the bent section 32 on the edge busbar 2 and the edge end 75 is 4mm~12mm.

[0107] In some embodiments, the solar cell module is a back-contact cell module.

[0108] Understandably, the projection of the bent section 32 onto the edge busbar 2 refers to the orthographic projection of the bent section 32 onto the edge busbar 2 along the thickness direction of the battery cell.

[0109] In some embodiments, see Figures 2 to 4 As shown, the edge battery string 11 includes a first battery cell 111 and a second battery cell 112 arranged adjacent to each other. The first battery cell 111 is located at one end of the edge battery string 11 in a first direction. The edge busbar 2 is located on the back side of the second battery cell 112. An insulating member 4 is provided between the edge busbar 2 and the back side of the second battery cell 112.

[0110] The edge busbar 2 is located on the back of the second cell 112, which allows the battery module to reserve more space to install the cells, resulting in a larger effective light-receiving area and higher conversion efficiency. At the same time, when viewed from the front of the cell, the edge busbar 2 is not exposed, making the overall appearance of the battery module better.

[0111] Understandably, the edge busbar 2 can be either an end busbar 2A or an intermediate busbar 2B. The end busbar 2A is a busbar used to connect at least two battery strings 1 arranged adjacent to each other along the second direction, and the intermediate busbar 2B is a busbar used to connect at least two battery strings 1 arranged adjacent to each other along the first direction in parallel.

[0112] See Figure 1 , Figure 2 and Figure 5 As shown, when the edge busbar 2 is an end busbar 2A, the first battery cell 111 is disposed at one end of the edge battery string 11 near the edge of the battery assembly in the first direction. This first battery cell 111 is denoted as the first battery cell A111A, the corresponding second battery cell 112 is denoted as the second battery cell A112A, and the corresponding edge busbar solder strip 3 is denoted as the first edge busbar solder strip 3A; see also... Figure 1 and Figure 3 As shown, when the edge busbar 2 is the middle busbar 2B, the first battery cell 111 is located at one end of the edge of the edge battery string 11 away from the first direction of the battery assembly. The first battery cell 111 is referred to as the first battery cell B111B, the corresponding second battery cell 112 is referred to as the second battery cell B112B, and the corresponding edge busbar solder strip 3 is referred to as the second edge busbar solder strip 3B.

[0113] In some embodiments, see Figure 1 , Figure 5 and Figure 6As shown, the battery cell includes a plurality of fine grids 71 ​​and a plurality of end busbars 72. The fine grids 71 ​​extend along a second direction and the plurality of fine grids 71 ​​are arranged along a first direction. The end busbars 72 are located on both sides of the battery cell in the first direction and extend along the first direction. The plurality of end busbars 72 are arranged along the second direction, and the same end busbar 72 connects to a plurality of fine grids 71 ​​of the same polarity.

[0114] The battery assembly also includes series bonding strips 5, which are used to connect adjacent battery cells in the same battery string 1 in series. The series bonding strips 5 extend along a first direction, and several series bonding strips 5 are arranged along a second direction.

[0115] The series welding strip 5 is electrically connected to its adjacent end bus line 72 of the same polarity in the second direction; the two ends of the series welding strip 5 in the first direction are provided with welding strip ends. On the same side of the cell in the first direction, the distance h1 from the first edge 73 to its adjacent end bus line 72 in the first direction is less than the distance h2 from the welding strip end to the first edge 73 in the first direction; the first edge 73 is the edge of the cell where the welding strip end is located that is closest to the welding strip end in the first direction.

[0116] It is understandable that the series welding strip 5 connects adjacent cells in the same battery string 1, and the two ends of the same series welding strip 5 are respectively located on the side of the adjacent cell that is far away from each other in the first direction.

[0117] In this embodiment, an end bus line 72 is provided on the battery cell to collect the fine grid 71 at the first edge of the battery cell in the first direction. The distance h1 from the first edge 73 to its adjacent end bus line 72 in the first direction is less than the distance h2 from the end of the solder ribbon to the first edge 73 in the first direction. This ensures that the end of the solder ribbon 5 does not exceed the first edge 73 of the battery cell, avoiding risks such as short circuits and microcracks. At the same time, the end bus line 72 can collect the current of the fine grid 71 between the end of the solder ribbon and the first edge 73 on the battery cell, increasing the current collection capacity of the fine grid 71 in this area, thereby improving the overall conversion efficiency of the battery module.

[0118] In some embodiments, see Figures 4 to 6 As shown, in the first direction, the edge busbar 2 is disposed on the side of the second battery cell 112 close to the first battery cell 111; and in the second direction, the projection of the edge busbar 2 on the second battery cell 112 overlaps with the end busbar 72 on the second battery cell 112, and the projection of the bent section 32 on the second battery cell 112 is offset from the end busbar 72 on the second battery cell 112.

[0119] The location of the end busbar 72 is inherently prone to stress concentration. If it is placed at the connection between the edge busbar 2 and the edge busbar solder strip 3, the stress generated during the welding, lamination and other production processes will directly act on the location of the end busbar 72, which will easily superimpose stress and exacerbate the risk of stress concentration. In this embodiment, by making the projection of the bent section 32 on the second cell 112 staggered with the end busbar 72 on the second cell 112, the projection of the bent section 32 on the second cell 112 and the end busbar 72 on the second cell 112 are avoided from overlapping, thus further reducing stress concentration and avoiding the risk of microcracks and fragmentation, so that the battery module has both high conversion efficiency and better long-term reliability.

[0120] In some embodiments, see Figure 4 and Figure 6 As shown, the end busbar 72 includes a first end busbar 721 and a second end busbar 722 with opposite polarities. The first end busbar 721 and the second end busbar 722 are staggered in a second direction. In the second direction, the projection of the bent section 32 on the second battery cell 112 is located between the first end busbar 721 and the second end busbar 722 on the second battery cell 112.

[0121] On the second battery cell 112, the distance W2 between the projection of the bent segment 32 and the first end busbar 721 closest to the bent segment 32 in the second direction is 3mm~8mm; and / or,

[0122] On the second battery cell 112, the distance W3 between the projection of the bent section 32 and the second end busbar 722 closest to the bent section 32 in the second direction is 1mm to 4mm.

[0123] For example, W2 can be 3mm, 4mm, 5mm, 6mm, 7mm or 8mm, but is not limited to this.

[0124] For example, W3 can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm or 4mm, but is not limited thereto.

[0125] Within this range, the projection of the bent section 32 on the second cell 112 and the spacing between the first end busbar 721 and the second end busbar 722 on both sides of it in the second direction can be balanced, ensuring that the projection of the bent section 32 on the second cell 112 and the first end busbar 721 and the second end busbar 722 on both sides of it in the second direction have a relatively appropriate distance. In production, it is permissible for the bent section 32 to have a certain degree of offset in the second direction relative to the first end busbar 721 and the second end busbar 722 on both sides of it, reducing the production accuracy requirements and further improving the long-term reliability and production yield of the battery module.

[0126] In some embodiments, the fine grid 71 includes a first fine grid 711 and a second fine grid 712 with opposite polarities, and the first fine grid 711 and the second fine grid 712 are arranged alternately on the back side of the battery cell along a first direction.

[0127] The first end bus 721 is electrically connected to a plurality of first fine gates 711, and the second end bus 722 is electrically connected to a plurality of second fine gates 712.

[0128] In some embodiments, see Figures 4 to 6 As shown, in the second direction, the projection of the bent segment 32 onto the second solar cell 112 is offset from the projection of the series welding strip 5 onto the second solar cell 112; and / or,

[0129] In the second direction, the serial welding strip 5 on the second cell 112 is staggered from the end bus line 72.

[0130] In the first embodiment, the projection of the bent section 32 on the second battery cell 112 is offset from the series welding strip 5 on the second battery cell 112.

[0131] By staggering the projection of the bending section 32 on the second cell 112 with the series welding strip 5 on the second cell 112, the risk of microcracks and fragmentation caused by excessive local stacking thickness is avoided, thereby further increasing the long-term stability of the battery module.

[0132] In the second embodiment, the serial solder strip 5 on the second battery cell 112 is staggered from the end bus line 72.

[0133] By staggering the series solder strip 5 and the end busbar 72, the stress generated during the production process such as welding of the series solder strip 5 and lamination of the battery module is prevented from acting directly on the location of the end busbar 72, thereby further reducing stress concentration, avoiding the risk of microcracks and fragmentation, and further increasing the long-term stability of the battery module.

[0134] Preferably, in the third embodiment, the projection of the bent section 32 on the second cell 112 is offset from the series welding strip 5 on the second cell 112, and the series welding strip 5 on the second cell 112 is offset from the end bus line 72. That is, in the second direction, the projection of the bent section 32 on the second cell 112, the series welding strip 5 on the second cell 112, and the end bus line 72 on the second cell 112 are offset from each other, further reducing stress concentration, avoiding the risk of microcracks and fragmentation, and further increasing the long-term stability of the battery module.

[0135] In some embodiments, see Figure 5As shown, adjacent battery cells are connected by series soldering ribbons 5. Specifically, the series soldering ribbons 5 include a first series soldering ribbon 51 and a second series soldering ribbon 52. In the first direction, the first series soldering ribbon 51 and the second series soldering ribbon 52 are staggered. In the second direction, the first series soldering ribbon 51 and the second series soldering ribbon 52 are staggered. In a battery string 1, the Nth battery cell, the N+1th battery cell, and the N+2th battery cell (N is a positive integer greater than 1) are arranged sequentially along the first direction. The positive electrode solder joint / positive electrode grid of the Nth battery cell is connected to the negative electrode solder joint / negative electrode grid of the N+1th battery cell by multiple first series soldering ribbons 51 arranged along the second direction. The positive electrode solder joint / positive electrode grid of the N+1th battery cell is connected to the negative electrode solder joint / negative electrode grid of the N+2th battery cell by multiple second series soldering ribbons 52 arranged along the second direction.

[0136] In some embodiments, see Figures 4 to 6 As shown, the series bonding strip 5 includes a first series bonding strip 51 and a second series bonding strip 52. The first series bonding strip 51 and the second series bonding strip 52 are staggered in a first direction, and are also staggered in a second direction. On the second cell, the polarity of the fine grid 71 connected to the first series bonding strip 51 is the same as the polarity of the bent section 32.

[0137] On the second solar cell 112, the spacing W4 in the second direction between the projection of the bent segment 32 and the first tandem weld strip 51 closest to the bent segment 32 is 2mm~7mm; and / or,

[0138] On the second cell 112, the distance W5 between the projection of the bent section 32 and the second serial welding strip 52 closest to the bent section 32 in the second direction is 1mm to 4mm.

[0139] For example, W4 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm or 7mm, but is not limited thereto.

[0140] For example, W5 can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm or 4mm, but is not limited thereto.

[0141] Within this range, the projection of the bent section 32 on the second cell 112 and the spacing between the first series welding strip 51 and the second series welding strip 52 on both sides of it in the second direction can be balanced, ensuring that the projection of the bent section 32 on the second cell 112 and the first series welding strip 51 and the second series welding strip 52 on both sides of it in the second direction have a relatively appropriate distance. In production, a certain degree of offset of the bent section 32 relative to the first series welding strip 51 and the second series welding strip 52 on both sides of it in the second direction is allowed, reducing the production accuracy requirements and further improving the long-term reliability and production yield of the battery module.

[0142] In some embodiments, see Figures 4 to 6 As shown, the tandem solder strip 5 includes a first tandem solder strip 51 and a second tandem solder strip 52. The first tandem solder strip 51 and the second tandem solder strip 52 are staggered in a first direction, and are also staggered in a second direction. On the second cell, the fine grid 71, the first end busbar 721, and the bent section 32 connected to the first tandem solder strip 51 have the same polarity.

[0143] On the second cell 112, the first tandem solder strip 51 is electrically connected to the first end busbar 721 closest to the first tandem solder strip 51, and the distance W6 between the two is 0.2mm~2mm.

[0144] For example, W6 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm, but is not limited thereto.

[0145] Within this range, the spacing between the series welding strip 5 on the second cell 112 and the first end busbar 721 and the second end busbar 722 on both sides of it in the second direction can be balanced, ensuring that the series welding strip 5 on the second cell 112 has a relatively appropriate distance from the first end busbar 721 and the second end busbar 722 on both sides of it in the second direction. In production, the bending section 32 is allowed to have a certain degree of offset in the second direction relative to the first end busbar 721 and the second end busbar 722 on both sides of it, reducing the production accuracy requirements and further improving the long-term reliability and production yield of the battery module.

[0146] In some embodiments, see Figures 4 to 6 As shown, in the same battery cell, a pad point 74 for electrically connecting the series solder strip 5 and its adjacent end bus line 72 of the same polarity is provided, and in the second direction, the center line of the pad point 74 is offset from the end bus line 72 connected to it.

[0147] The series solder strip 5 is electrically connected to its adjacent end busbar 72 of the same polarity through pad point 74, and a certain degree of offset between the series solder strip 5 and its adjacent end busbar 72 of the same polarity is allowed, reducing the production accuracy requirements and further improving the long-term reliability and production yield of the battery module.

[0148] Understandable. Figure 6 For illustrative purposes only, the fine grid 71 may have blank areas (not shown in the figure) at the locations of opposite-polarity conductive components such as the end bus line 72, solder strip, and pad point, where the fine grid 71 paste is not printed. Insulating adhesive (not shown in the figure) may also be printed near these locations to electrically isolate them from opposite-polarity conductive components. The above-mentioned electrical isolation structure can be found in the prior art and will not be described in detail here.

[0149] In some embodiments, see Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the battery string 1 also includes a secondary edge battery string 12, which is arranged adjacent to the edge battery string 11 in the second direction.

[0150] The secondary edge busbar A61 is used to electrically connect the secondary edge battery string 12 and the edge busbar 2. The secondary edge busbar A61 includes a base section A611 and a bend section A612. The base section A611 extends along a first direction, and the bend section A612 is located on the side of the base section close to the edge busbar 2. At this time, the edge busbar 2 is an end busbar 2A, and the edge battery string 11 and the secondary edge battery string 12 are connected in series with each other through the edge busbar 2.

[0151] In the second direction, the bending direction of the bending segment 32 is the same as or opposite to that of the turning segment A612.

[0152] In some embodiments, see Figure 2 , Figures 7 to 9 As shown, the battery assembly also includes a series bonding strip 5 for connecting adjacent cells in the same battery string 1.

[0153] The battery cell includes a third battery cell 121 disposed in the secondary edge battery string 12, and the first battery cell 111 and the third battery cell 121 are disposed adjacent to each other in the second direction;

[0154] On the first battery cell 111, the edge busbars 3 and the series welds 5 are arranged alternately along the second direction; on the third battery cell 121, the secondary edge busbars A61 and the series welds 5 are arranged alternately along the second direction.

[0155] In the second direction, the first battery cell 111 has a first end solder strip on the side near the secondary edge battery string 12, and the third battery cell 121 has a second end solder strip on the side near the edge battery string 11. The first end solder strip and the second end solder strip are arranged adjacent to each other.

[0156] See Figure 7 As shown, when the first end weld strip is the edge busbar weld strip 3 and the second end weld strip is the series weld strip 5, the bending direction of the bending section 32 is opposite to that of the turning section A612.

[0157] See Figure 5 As shown, when the first end weld strip is the edge busbar weld strip 3 and the second end weld strip is the sub-edge busbar weld strip A61, the bending direction of the bending section 32 and the bending section A612 is the same.

[0158] See Figure 8 As shown, when the first end weld strip is a series weld strip 5 and the second end weld strip is a secondary edge bus weld strip A61, the bending direction of the bending section 32 and the bending section A612 is the same.

[0159] See Figure 9 As shown, when the first end weld strip is a series weld strip 5 and the second end weld strip is a series weld strip 5, the bending direction of the bending section 32 is opposite to that of the turning section A612.

[0160] If the distance between the first end solder strip and the second end solder strip is too small, on the one hand, the process deviations in the placement of the first end solder strip and the second end solder strip may cause them to interfere with each other, resulting in a short circuit and affecting the production yield; on the other hand, if the distance between them is too small, it may also cause local overheating in this area, increasing the risk of hot spots and reducing the long-term reliability and overall busbar efficiency of the battery module.

[0161] When the distance between the first end solder strip and the second end solder strip is too large, on the one hand, the edge busbar 2 cannot be effectively utilized in this area, and its own resistance will generate additional ohmic losses, resulting in a decrease in the output power of the module; on the other hand, it is easy to reduce the mechanical strength of this area, making it more prone to deformation under lamination and subsequent mechanical loads, applying stress to the solder joints, and reducing the long-term reliability of the battery module.

[0162] In this embodiment, the bending direction of the edge busbar 3 and the secondary edge busbar A61 is designed for different scenarios to ensure that the distance between the first end strip and the second end strip is not too small or too large, so as to ensure that the battery module can have good output power, production yield and long-term reliability.

[0163] In some embodiments, see Figure 1 , Figure 3As shown, the battery string 1 also includes a secondary edge battery string 12, which is arranged adjacent to the edge battery string 11 in the second direction.

[0164] Secondary edge busbar 8 is arranged adjacent to edge busbar 2 in the second direction.

[0165] The secondary edge busbar B62 is used to electrically connect the secondary edge battery string 12 and the secondary edge busbar 8. The secondary edge busbar B62 includes a base section B621 and a bend section B622. The base section B621 extends along the first direction, and the bend section B622 is located on the side of the base section B621 near the edge busbar 2. At this time, the edge busbar 2 is a middle busbar 2B. The two edge battery strings 11 arranged along the first direction are connected in parallel to each other through the edge busbar 2, and the two secondary edge battery strings 12 arranged along the first direction are connected in parallel to each other through the secondary edge busbar 8.

[0166] In the second direction, the bending direction of the bending segment 32 is the same as or opposite to that of the turning segment B622.

[0167] In some embodiments, see Figure 1 , Figure 3 , Figures 10 to 12 As shown, the battery assembly also includes a series bonding strip 5 for connecting adjacent cells in the same battery string 1.

[0168] The battery cell includes a fourth battery cell 122 disposed in the secondary edge battery string 12, and the first battery cell 111 and the fourth battery cell 122 are disposed adjacent to each other in the second direction;

[0169] On the first battery cell 111, the edge busbars 3 and the series welds 5 are arranged alternately along the second direction; on the fourth battery cell 122, the secondary edge busbars B62 and the series welds 5 are arranged alternately along the second direction.

[0170] In the second direction, the first battery cell 111 has a first end solder strip on the side near the secondary edge battery string 12, and the fourth battery cell 122 has a second end solder strip on the side near the edge battery string 11. The first end solder strip and the second end solder strip are arranged adjacent to each other.

[0171] See Figure 10 As shown, when the first end weld strip is the edge busbar weld strip 3 and the second end weld strip is the series weld strip 5, the bending direction of the bending section 32 is opposite to that of the turning section B622.

[0172] See Figure 3 As shown, when the first end weld strip is the edge busbar weld strip 3 and the second end weld strip is the sub-edge busbar weld strip B62, the bending direction of the bending section 32 and the bending section B622 is the same.

[0173] See Figure 11 As shown, when the first end weld strip is a series weld strip 5 and the second end weld strip is a secondary edge bus weld strip B62, the bending direction of the bending section 32 and the bending section B622 is the same.

[0174] See Figure 12 As shown, when the first end weld strip is a series weld strip 5 and the second end weld strip is a series weld strip 5, the bending direction of the bending section 32 is opposite to that of the turning section B622.

[0175] If the distance between the first end solder strip and the second end solder strip is too small, the two are prone to interference due to process deviations during placement, resulting in short circuits and affecting production yield.

[0176] When the distance between the first end solder strip and the second end solder strip is too large, on the one hand, the area between the first end solder strip and the second end solder strip of the edge busbar 2 and the secondary edge busbar 8 cannot be effectively utilized, and their own resistance will generate additional ohmic losses, resulting in a decrease in the output power of the module; on the other hand, it is easy to reduce the mechanical strength of this area, and it is more likely to deform under lamination and subsequent mechanical loads, which will put stress on the solder joint and reduce the long-term reliability of the battery module.

[0177] In this embodiment, the bending direction of the edge busbar 3 and the secondary edge busbar B62 is designed for different scenarios to ensure that the distance between the first end strip and the second end strip is not too small or too large, so as to ensure that the battery module can have good output power, production yield and long-term reliability.

[0178] Secondly, the present invention also provides a photovoltaic system, including the aforementioned solar cell module.

[0179] In this embodiment, the photovoltaic system can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system are not limited to these; that is, the photovoltaic system can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple battery modules; for example, multiple battery modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0180] In the description of this specification, references to terms such as "some embodiments," "exemplary," "example," or "for example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0181] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A solar cell module, characterized in that, include: A battery string, comprising a plurality of interconnected battery cells arranged along a first direction, and the battery string includes an edge battery string located on any one or both edges of the battery assembly in a second direction. An edge busbar is connected in series with the edge battery on the same side edge of the battery assembly in a second direction. The edge busbar extends along the second direction, and the first direction and the second direction intersect each other. Edge bus solder strip, the edge bus solder strip being all solder strips on the edge battery string for electrically connecting the edge battery string and the edge bus member, the edge bus solder strip including a main body segment and a bent segment arranged along a first direction, the main body segment extending along the first direction, and the bent segment located on the side of the main body segment close to the edge bus member; On the battery cells in the edge battery string, one end near the corresponding side edge of the battery assembly in the second direction is the edge end, and the bent segment is bent in the second direction away from the edge end.

2. A solar cell module according to claim 1, characterized in that, In the second direction, the bending segment includes an offset segment and a parallel segment arranged sequentially away from the main body segment. The line connecting the two ends of the offset segment in the first direction forms an angle with the first direction, and the parallel segment is arranged along the first direction.

3. A solar cell module according to claim 1, characterized in that, In the second direction, the distance between the projection of the bent segment on the edge busbar and the edge end is 4mm to 22mm.

4. A solar cell module according to claim 3, characterized in that, The battery assembly further includes a series bonding strip for connecting adjacent battery cells in the same battery string, the series bonding strip extending along a first direction; The edge battery string includes a first battery cell, the main body segment is disposed on the first battery cell, and the main body segment and the serial welding strip are arranged alternately along the second direction on the first battery cell; In the second direction, when the solder strip closest to the edge end on the first battery cell is the serial solder strip, the distance between the projection of the bent section on the edge busbar and the edge end is 10mm~22mm. In the second direction, when the solder strip closest to the edge end on the first battery cell is the edge busbar solder strip, the distance between the projection of the bent section on the edge busbar and the edge end is 4mm~12mm.

5. A solar cell module according to claim 1, characterized in that, The edge battery string includes a first battery cell and a second battery cell arranged adjacent to each other, with the first battery cell located at one end of the edge battery string in a first direction, the edge busbar located on the back side of the second battery cell, and an insulating member provided between the edge busbar and the back side of the second battery cell.

6. A solar cell module according to claim 5, characterized in that, The battery cell includes a plurality of fine grids and a plurality of end busbars. The fine grids extend along a second direction and the plurality of fine grids are arranged along a first direction. The end busbars are located on both sides of the battery cell in the first direction. The end busbars extend along the first direction and the plurality of end busbars are arranged along the second direction. The same end busbar connects to a plurality of fine grids of the same polarity. The battery assembly further includes series bonding strips for connecting adjacent battery cells in the same battery string. The series bonding strips extend along a first direction, and a plurality of series bonding strips are arranged along a second direction. The series solder strip is electrically connected to the end busbar of the same polarity that is adjacent to it in the second direction; the two ends of the series solder strip in the first direction are provided with solder strip ends, and on the same side of the cell in the first direction, the distance from the first edge to the adjacent end busbar in the first direction is less than the distance from the solder strip end to the first edge in the first direction; the first edge is the edge of the cell where the solder strip end is located that is closest to the solder strip end in the first direction.

7. A solar cell module according to claim 6, characterized in that, In a first direction, the edge busbar is disposed on the side of the second battery cell close to the first battery cell; and in a second direction, the projection of the edge busbar on the second battery cell overlaps with the end busbar on the second battery cell, and the projection of the bent section on the second battery cell is offset from the end busbar on the second battery cell.

8. A solar cell module according to claim 7, characterized in that, The end busbars include a first end busbar and a second end busbar with opposite polarities. The first end busbar and the second end busbar are staggered in a second direction, and in the second direction, the projection of the bent section on the second solar cell is located between the first end busbar and the second end busbar on the second solar cell. On the second solar cell, the distance between the projection of the bent segment and the first end busbar closest to the bent segment in the second direction is 3mm to 8mm; and / or, On the second battery cell, the distance between the projection of the bent section and the second end busbar closest to the bent section in the second direction is 1mm to 4mm.

9. A solar cell module according to claim 6, characterized in that, In the second direction, the projection of the bent segment onto the second solar cell is offset from the series bonding strips on the second solar cell; and / or, In the second direction, the serial solder strips on the second cell are staggered from the end busbars.

10. A solar cell module according to claim 9, characterized in that, The series bonding strips include a first series bonding strip and a second series bonding strip. The first and second series bonding strips are staggered in a first direction and staggered in a second direction. On the second solar cell, the polarity of the fine grid connected to the first series bonding strip is the same as the polarity of the bent section. On the second solar cell, the distance between the projection of the bent segment and the first series weld strip closest to the bent segment in the second direction is 2mm to 7mm; and / or, On the second cell, the distance between the projection of the bent section and the second serial welding strip closest to the bent section in the second direction is 1mm to 4mm.

11. A solar cell module according to claim 9, characterized in that, The series bonding strips include a first series bonding strip and a second series bonding strip, which are staggered in a first direction and in a second direction. The end busbars include a first end busbar and a second end busbar with opposite polarities, which are staggered in a second direction. On the second solar cell, the grid connected to the first series bonding strip, the first end busbar, and the bent section have the same polarity. On the second cell, the first series solder strip is electrically connected to the first end busbar closest to the first series solder strip, and the distance between the two is 0.2mm to 2mm.

12. A solar cell module according to claim 6, characterized in that, In the same battery cell, a pad point for electrically connecting the series solder strip and its adjacent end busbar of the same polarity is provided, and in a second direction, the centerline of the pad point is offset from the end busbar to which it is connected.

13. A solar cell module according to claim 5, characterized in that, The battery string also includes a secondary edge battery string, which is arranged adjacent to the edge battery string in the second direction; Secondary edge bus solder strip A is used to electrically connect the secondary edge battery string and the edge bus. The secondary edge bus solder strip A includes a base segment A and a bend segment A. The base segment A extends along a first direction, and the bend segment A is located on the side of the base segment close to the edge bus. In the second direction, the bending segment has the same or opposite bending direction as the turning segment A.

14. A solar cell module according to claim 13, characterized in that, The battery assembly also includes a series bonding strip for connecting adjacent battery cells in the same battery string; The battery cell includes a third battery cell disposed in the sub-edge battery string, and the first battery cell and the third battery cell are disposed adjacent to each other in a second direction; On the first battery cell, the edge busbar and the series solder strip are arranged alternately along the second direction; on the third battery cell, the secondary edge busbar A and the series solder strip are arranged alternately along the second direction. In the second direction, the first battery cell has a first end solder strip on the side near the secondary edge battery string, and the third battery cell has a second end solder strip on the side near the edge battery string. The first end solder strip and the second end solder strip are arranged adjacent to each other. When the first end solder strip is the edge busbar solder strip and the second end solder strip is the series solder strip, the bending direction of the bending section is opposite to that of the bend section A; When the first end weld strip is the edge busbar weld strip and the second end weld strip is the secondary edge busbar weld strip A, the bending direction of the bending section is the same as that of the turning section A; When the first end solder strip is the serial solder strip and the second end solder strip is the secondary edge busbar solder strip A, the bending direction of the bending section is the same as that of the turning section A; When the first end weld strip is the serial weld strip and the second end weld strip is the serial weld strip, the bending direction of the bending section is opposite to that of the turning section A.

15. A solar cell module according to claim 5, characterized in that, The battery string also includes a secondary edge battery string, which is arranged adjacent to the edge battery string in the second direction; The secondary edge busbar is disposed adjacent to the edge busbar in the second direction. The secondary edge busbar B is used to electrically connect the secondary edge battery string and the secondary edge busbar. The secondary edge busbar B includes a base section B and a bend section B. The base section B extends along a first direction, and the bend section B is located on the side of the base section B close to the edge busbar. In the second direction, the bending segment has the same or opposite bending direction as the turning segment B.

16. A solar cell module according to claim 15, characterized in that, The battery assembly also includes a series bonding strip for connecting adjacent battery cells in the same battery string; The battery cell includes a fourth battery cell disposed in the sub-edge battery string, and the first battery cell and the fourth battery cell are disposed adjacent to each other in a second direction; On the first battery cell, the edge busbar and the series solder strip are arranged alternately along the second direction; on the fourth battery cell, the secondary edge busbar B and the series solder strip are arranged alternately along the second direction. In the second direction, the first battery cell has a first end solder strip on the side near the secondary edge battery string, and the fourth battery cell has a second end solder strip on the side near the edge battery string. The first end solder strip and the second end solder strip are arranged adjacent to each other. When the first end solder strip is the edge busbar solder strip and the second end solder strip is the series solder strip, the bending direction of the bending section is opposite to that of the bend section B; When the first end weld strip is the edge busbar weld strip and the second end weld strip is the secondary edge busbar weld strip B, the bending direction of the bending section is the same as that of the turning section B. When the first end solder strip is the serial solder strip and the second end solder strip is the secondary edge busbar solder strip B, the bending direction of the bending section is the same as that of the turning section B. When the first end weld strip is the serial weld strip and the second end weld strip is the serial weld strip, the bending direction of the bending section is opposite to that of the turning section B.

17. A photovoltaic system, characterized in that, Includes a solar cell module according to any one of claims 1 to 16.

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