Battery string and photovoltaic module

Abstract

The utility model discloses a cell string and a photovoltaic assembly. The cell string comprises photovoltaic cells, a plurality of solder strips and a positioning member. A plurality of positive grid lines and a plurality of negative grid lines are arranged on the surface of one side of the photovoltaic battery piece, the plurality of welding strips comprise a plurality of middle welding strips, a first edge welding strip and a second edge welding strip, and the first edge welding strip and the second edge welding strip are located on the two sides of the plurality of middle welding strips in the second direction respectively. Therefore, the first edge welding strip and the second edge welding strip are adjacent to the edge of the battery string, the number of the welding strips is increased, collection of current of the edge of the battery string in the second direction is achieved, the problem that the distance between a main grid design edge welding position and the edge of the battery needs to be large is solved, the current led out by the welding strips is increased, and the power of the battery string is improved. The arrangement of the positioning pieces facilitates the fixation of the solder strips, enhances the connection strength between the plurality of solder strips and the photovoltaic cells, and further improves the use reliability of the cell string.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic components, in particular to a battery string and a photovoltaic component. Background Art

[0002] In the prior art, the soldering strips and the fine grid lines are fixed to each other by welding or laminating, which results in a waste of solder paste, high component cost and low efficiency. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery string that can reduce the production cost of the battery string, increase the power of the battery string, and improve the reliability of the battery string.

[0004] The second objective of the present invention is to provide a photovoltaic assembly, comprising the battery string described in the above embodiment.

[0005] According to the battery string of the first embodiment of the utility model, it includes: a photovoltaic cell sheet, a plurality of welding strips and a positioning member. A plurality of positive grid lines and a plurality of negative grid lines are arranged on one side surface of the photovoltaic cell sheet, the plurality of positive grid lines and the plurality of negative grid lines are arranged alternately along the first direction and extend along the second direction, each of the positive grid lines includes a plurality of positive grid line segments arranged at intervals along the second direction, a positive avoidance opening is defined between two adjacent positive grid line segments, and the plurality of positive avoidance openings of the plurality of positive grid lines are respectively opposite to each other along the first direction, each of the negative grid lines includes a plurality of negative grid line segments arranged at intervals along the second direction, a negative avoidance opening is defined between two adjacent negative grid line segments, and the plurality of negative avoidance openings of the plurality of negative grid lines are respectively opposite to each other along the first direction, the positive avoidance opening and the negative avoidance opening are arranged in a staggered manner along the first direction, and the first direction is perpendicular to the second direction.

[0006] The plurality of welding strips are arranged at intervals along the second direction, and the plurality of welding strips all extend along the first direction. The plurality of welding strips include a plurality of middle welding strips, a first edge welding strip and a second edge welding strip. The plurality of middle welding strips include at least one first middle welding strip and at least one second middle welding strip. The first middle welding strip is located at the negative electrode avoidance port and is spaced apart from the adjacent negative electrode grid line segments. The first middle welding strip is electrically connected to the plurality of positive electrode grid line segments. The second middle welding strip is located at the positive electrode avoidance port and is spaced apart from the adjacent positive electrode grid line segments. The second middle welding strip is electrically connected to the plurality of negative electrode grid line segments. The first edge welding strip and the second edge welding strip are respectively located on both sides of the plurality of middle welding strips along the second direction. The first edge welding strip is spaced apart from the negative electrode grid line segments and is electrically connected to the positive electrode grid line segments. The second edge welding strip is spaced apart from the positive electrode grid line segments and is electrically connected to the negative electrode grid line segments. The positioning member is provided on one side of the plurality of welding strips away from the photovoltaic cell sheet to limit the movement of the welding strips relative to the photovoltaic cell sheet.

[0007] According to the battery string of the embodiment of the utility model, the first edge welding strip and the second edge welding strip are adjacent to the edge of the battery string, the number of welding strips is increased, and the current along the edge of the battery string in the second direction is collected, which avoids the problem that the edge welding position of the main grid design needs to be far away from the edge of the battery, increases the current derived by the welding strip, and improves the power of the battery string. The setting of the positioning member facilitates the fixing of the welding strip, enhances the connection strength between the multiple welding strips and the photovoltaic cell sheet, and further improves the reliability of the battery string. The setting of the positive avoidance port and the negative avoidance port facilitates the connection of multiple welding strips to the positive grid line and the negative grid line respectively, so as to achieve insulation between grid lines of different polarities, reduce the loss of the slurry of the printed grid line, and reduce the production cost.

[0008] In some embodiments, the first edge welding strip is arranged on the plurality of positive grid line segments and the plurality of negative grid line segments adjacent to the photovoltaic cell edge on one side along the second direction, the first edge welding strip is separated from the plurality of negative grid line segments adjacent to the photovoltaic cell edge on one side along the second direction by a first insulating member, and the first edge welding strip is electrically connected to the plurality of positive grid line segments adjacent to the photovoltaic cell edge on one side along the second direction by a first welding member; the second edge welding strip is arranged on the plurality of positive grid line segments and the plurality of negative grid line segments adjacent to the photovoltaic cell edge on the other side along the second direction, the second edge welding strip is separated from the plurality of positive grid line segments adjacent to the photovoltaic cell edge on the other side along the second direction by a second insulating member, and the second edge welding strip is electrically connected to the plurality of negative grid line segments adjacent to the photovoltaic cell edge on the other side along the second direction by a second welding member.

[0009] In some embodiments, the length of the insulating glue is L 1 , width W 1 , height H 1 , the L 1 , W 1 and H 1 Satisfy respectively: 2mm<L 1 <10mm,0.2mm<W 1 <0.8mm,0.03mm<H 1 <0.1mm.

[0010] In some embodiments, the length of the solder paste is L 2 , width W 2 , height H 2 , the L 2 , W 2 and H 2 Satisfy respectively: 0.3mm<L 2 <1mm,0.2mm<W 2 <0.5mm,0.03mm<H 2 <0.15mm.

[0011] In some embodiments, the first insulating member and the second insulating member are insulating glue, respectively, and the first welding member and the second welding member are low-temperature solder paste, respectively.

[0012] In some embodiments, the first edge welding strip is arranged on the multiple positive pole grid line segments adjacent to the one side edge of the photovoltaic cell along the second direction, the first edge welding strip is located between the one side edge of the photovoltaic cell along the second direction and the multiple negative pole grid line segments adjacent to the one side edge of the photovoltaic cell along the second direction, and the first edge welding strip and the multiple negative pole grid line segments adjacent to the one side edge of the photovoltaic cell along the second direction are spaced apart from each other; the second edge welding strip is arranged on the multiple negative pole grid line segments adjacent to the other side edge of the photovoltaic cell along the second direction, the second edge welding strip is located between the other side edge of the photovoltaic cell along the second direction and the multiple positive pole grid line segments adjacent to the other side edge of the photovoltaic cell along the second direction, and the second edge welding strip and the multiple positive pole grid line segments adjacent to the other side edge of the photovoltaic cell along the second direction are spaced apart from each other.

[0013] In some embodiments, the distance between the first edge welding strip and the edge of the photovoltaic cell along the second direction is D 1 , D 1 Satisfy: 0.5mm<D1 <1.5mm; the distance between the second edge welding strip and the other side edge of the photovoltaic cell along the second direction is D 2 , D 2 Satisfy: 0.5mm<D 2 <1.5mm.

[0014] In some embodiments, a first edge grid line and a second edge grid line are further provided on the surface of one side of the photovoltaic cell sheet, the first edge grid line and the second edge grid line both extend along the first direction, the first edge grid line and the second edge grid line are respectively located on both sides of the multiple positive grid lines and the multiple negative grid lines along the second direction, the first edge grid line is spaced apart from one end of the multiple negative grid lines along the second direction, the first edge grid line is connected to one end of the multiple positive grid lines along the second direction, the second edge grid line is spaced apart from the other end of the multiple positive grid lines along the second direction, and the second edge grid line is connected to the other end of the multiple negative grid lines along the second direction.

[0015] In some embodiments, the distance between the first edge grid line and one end of the plurality of negative grid lines along the second direction is D 3 , D 3 Satisfy: 0.2mm<D 3 <0.8mm; the distance between the second edge grid line and the other end of the plurality of positive grid lines along the second direction is D 4 , D 4 Satisfy: 0.2mm<D 4 <0.8mm.

[0016] In some embodiments, the positioning member includes a dot-shaped film point or a glue point, and the positioning member covers the intersection of the welding strip and the positive electrode grid line or the negative electrode grid line.

[0017] In some embodiments, the positioning member includes a strip of film or a strip of adhesive tape, the positioning member extends along the first direction, and the positioning member covers the welding strip; or the positioning member extends along the second direction, and the positioning member covers the positive electrode grid line or the negative electrode grid line.

[0018] In some embodiments, the positioning member covers the one side surface of the photovoltaic cell.

[0019] In some embodiments, there are a plurality of photovoltaic cells, the plurality of photovoltaic cells are electrically connected to each other through a plurality of welding strips, and the positioning member covers the plurality of photovoltaic cells.

[0020] In some embodiments, the welding strip is a circular welding strip, and the diameters d, d of the welding strip satisfy: 0.15mm≤d≤0.35mm.

[0021] The photovoltaic assembly according to the second embodiment of the utility model comprises a battery string according to the first embodiment of the utility model.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 Schematic diagram of a battery string according to an embodiment of the present utility model.

[0025] Figure 2 It is a schematic diagram of a photovoltaic cell according to an embodiment of the utility model.

[0026] Figure 3 It is a schematic diagram of a photovoltaic cell and a positioning member according to an embodiment of the utility model.

[0027] Figure 4 It is a schematic diagram of a photovoltaic cell according to another embodiment of the utility model.

[0028] Figure 5 It is a schematic diagram of a photovoltaic cell and a positioning member according to another embodiment of the utility model.

[0029] Reference numerals:

[0030] 100. Battery string;

[0031] 10. Photovoltaic cell; 11. Positive grid line; 111. Positive grid line segment; 112. Positive avoidance port; 113. First edge grid line; 12. Negative grid line; 121. Negative grid line segment; 122. Negative avoidance port; 123. Second edge grid line;

[0032] 20. welding strip; 21. first middle welding strip; 22. second middle welding strip; 23. first edge welding strip; 24. second edge welding strip; 25. first insulating member; 26. second insulating member; 27. first welding member; 28. second welding member;

[0033] 30. Positioning parts;

[0034] A. First direction; B. Second direction. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 5 The cell string 100 according to the embodiment of the present invention is described, comprising: a photovoltaic cell 10, a plurality of welding strips 20 and a positioning member 30. The photovoltaic cell 10 has a first direction A and a second direction B.

[0036] Specifically, if Figure 1-Figure 5 As shown, a plurality of positive grid lines 11 and a plurality of negative grid lines 12 are provided on one side surface of the photovoltaic cell 10, and the plurality of positive grid lines 11 and the plurality of negative grid lines 12 are alternately arranged along a first direction A, and the positive grid lines 11 and the negative grid lines 12 both extend along a second direction B, and the polarities of the positive grid lines 11 and the negative grid lines 12 are opposite.

[0037] The positive grid line 11 and the negative grid line 12 are arranged on one side of the thickness direction of the photovoltaic cell 10. For example, the positive grid line 11 (such as Figure 1 The dark lines in the figure) and the negative grid lines 12 (such as Figure 1 The light-colored lines in the figure can collect and transmit photogenerated carriers to form current, thereby enabling the battery to convert solar energy into electrical energy.

[0038] Each positive grid line 11 includes a plurality of positive grid line segments 111 spaced apart along the second direction B, a positive avoidance opening 112 is defined between two adjacent positive grid line segments 111, the plurality of positive avoidance openings 112 are spaced apart along the two directions, the plurality of positive avoidance openings 112 of the plurality of positive grid lines 11 are respectively opposite to each other along the first direction A, and the number of the plurality of positive avoidance openings 112 of the plurality of positive grid lines 11 is equal. Each negative electrode grid line 12 includes a plurality of negative electrode grid line segments 121 spaced apart along the second direction B, a negative electrode avoidance opening 122 is defined between two adjacent negative electrode grid line segments 121, the plurality of negative electrode avoidance openings 122 are spaced apart along the second direction B, the plurality of negative electrode avoidance openings 122 of the plurality of negative electrode grid lines 12 are respectively opposite to each other along the first direction A, and the number of the plurality of negative electrode avoidance openings 122 of the plurality of negative electrode grid lines 12 is equal, the positive electrode avoidance opening 112 and the negative electrode avoidance opening 122 are staggeredly arranged along the first direction A, and the first direction A and the second direction B are perpendicular.

[0039] In this way, the spacing of the positive grid line segments 111 and the negative grid line segments 121 reduces the material usage of the positive grid lines 11 and the negative grid lines 12, thereby reducing the production costs of the positive grid lines 11 and the negative grid lines 12, and further reducing the production costs of the battery string 100. In addition, compared with the design with main grid lines in the conventional technology, the current transmission distance of part of the positive grid lines 11 and part of the negative grid lines 12 is shortened, thereby reducing the current loss of the battery string 100, thereby improving the utilization rate of the battery string 100 and improving the photoelectric conversion capacity of the battery string 100.

[0040] Multiple welding strips 20 are arranged at intervals along the second direction B, and the multiple welding strips 20 all extend along the first direction A. The multiple welding strips 20 include multiple middle welding strips 20, first edge welding strips 23 and second edge welding strips 24. The multiple middle welding strips 20 include at least one first middle welding strip 21 and at least one second middle welding strip 22. The first middle welding strip 21 is located at multiple negative electrode avoidance openings 122 of multiple negative electrode grid lines 12 and is spaced apart from adjacent negative electrode grid line segments 121. The first middle welding strip 21 is electrically connected to multiple positive electrode grid line segments 111. The second middle welding strip 22 is located at multiple positive electrode avoidance openings 112 of multiple positive electrode grid lines 11 and is spaced apart from adjacent positive electrode grid line segments 111. The second middle welding strip 22 is electrically connected to multiple negative electrode grid line segments 121. The first edge welding strip 23 and the second edge welding strip 24 are respectively located on both sides of the multiple middle welding strips 20 along the second direction B. The first edge welding strip 23 is separated from the multiple negative pole grid line segments 121 at the edge of one side of the adjacent photovoltaic cell 10 along the second direction B, and is electrically connected to the multiple positive pole grid line segments 111 at the edge of one side of the adjacent photovoltaic cell 10 along the second direction B. The second edge welding strip 24 is separated from the multiple positive pole grid line segments 111 at the edge of the other side of the adjacent photovoltaic cell 10 along the second direction B, and is electrically connected to the multiple negative pole grid line segments 121 at the edge of the other side of the adjacent photovoltaic cell 10 along the second direction B.

[0041] The plurality of welding strips 20 are suitable for being electrically connected to the photovoltaic cell sheet 10. When the first intermediate welding strip 21 extends through the negative electrode avoidance opening 122, the first intermediate welding strip 21 has no contact with the negative electrode grid line 12, thereby achieving insulation between the first intermediate welding strip 21 and the negative electrode grid line 12. When the second intermediate welding strip 22 extends through the positive electrode avoidance opening 112, the second intermediate welding strip 22 has no contact with the positive electrode grid line 11, thereby achieving insulation between the second intermediate welding strip 22 and the positive electrode grid line 11. The first edge welding strip 23 has no contact with the multiple negative electrode grid lines 12 on the side edge along the second direction B of the adjacent photovoltaic cell 10. The first edge welding strip 23 and the multiple negative electrode grid lines 12 can be separated by an insulating member, or can be separated by a specific structural separation designed by the length of the negative electrode grid line segment 121, so that there is no electrical connection between the first edge welding strip 23 and the multiple negative electrode grid lines 12, and the first edge welding strip 23 is electrically connected to the multiple positive electrode grid lines 11 on the side edge along the second direction B of the adjacent photovoltaic cell 10. The second edge welding strip 24 has no contact with the multiple positive grid lines 111 on the other side edge of the adjacent photovoltaic cell 10 along the second direction B. The second edge welding strip 24 and the multiple positive grid lines 11 can be separated by an insulating member, or can be separated by a specific structural design of the length of the positive grid lines 111, so that there is no electrical connection between the second edge welding strip 24 and the multiple positive grid lines 11, and the second edge welding strip 24 is electrically connected to the multiple negative grid lines 121 on the other side edge of the adjacent photovoltaic cell 10 along the second direction B.

[0042] The positioning member 30 is arranged on one side of the plurality of welding strips 20 away from the photovoltaic cell 10 to limit the movement of the welding strips 20 relative to the photovoltaic cell 10. The positioning member 30 is arranged on one side of the thickness direction of the photovoltaic cell 10, and the positive grid line 11, the negative grid line 12 and the plurality of welding strips 20 are arranged between the positioning member 30 and the photovoltaic cell 10. The positioning member 30 can cover the plurality of welding strips 20 so that the plurality of welding strips 20 are fixed on the photovoltaic cell 10. The positioning member 30 is an auxiliary element for accurately aligning and fixing the plurality of welding strips 20, ensuring the structural stability of the photovoltaic cell 10 in subsequent packaging, welding and other processes, as well as the electrical performance and reliability of the photovoltaic string.

[0043] According to the battery string 100 of the embodiment of the utility model, the first edge welding strip 23 and the second edge welding strip 24 are adjacent to the edge of the battery string 100, the number of welding strips is increased, and the current along the edge of the battery string in the second direction is collected, which avoids the problem that the edge welding position of the main grid design needs to be far away from the edge of the battery, increases the current derived by the welding strip 20, and improves the power of the battery string 100. The setting of the positioning member 30 facilitates the fixing of the welding strip 20, enhances the connection strength between the multiple welding strips 20 and the photovoltaic cell sheet 10, and further improves the reliability of the battery string 100. The setting of the positive electrode avoidance port 112 and the negative electrode avoidance port 122 facilitates the connection of multiple welding strips 20 with the positive electrode grid line 11 and the negative electrode grid line 12 respectively, so as to achieve insulation between grid lines of different polarities, reduce the loss of the slurry of the printed grid line, and reduce the production cost.

[0044] According to some embodiments of the present invention, Figure 2 and Figure 3 As shown, the first edge welding strip 23 is arranged on a plurality of positive grid line segments 111 and a plurality of negative grid line segments 121 on a side edge along the second direction B of an adjacent photovoltaic cell 10, the first edge welding strip 23 and the plurality of negative grid line segments 121 on a side edge along the second direction B of an adjacent photovoltaic cell 10 are separated by a first insulating member 25, and the first edge welding strip 23 and the plurality of positive grid line segments 111 on a side edge along the second direction B of an adjacent photovoltaic cell 10 are electrically connected by a first welding member 27.

[0045] The first insulating member 25 is disposed between the first edge welding strip 23 and the photovoltaic cell 10 along the thickness direction of the photovoltaic cell 10. The first insulating member 25 is disposed at a plurality of negative electrode avoidance openings 122 adjacent to the side edge of the photovoltaic cell 10 along the second direction B. The first edge welding strip 23 is separated from a plurality of negative electrode gridline segments 121 adjacent to the side edge of the photovoltaic cell 10 along the second direction B by the first insulating member 25. The first edge welding strip 23 is electrically connected to a plurality of positive electrode gridline segments 111 adjacent to the side edge of the photovoltaic cell 10 along the second direction B. The first welding member 27 is disposed between the first edge welding strip 23 and the plurality of positive electrode gridline segments 111 along the thickness direction of the photovoltaic cell 10. The first edge welding strip 23 is welded to the plurality of positive electrode gridline segments 111.

[0046] The second edge welding strip 24 is arranged on multiple positive grid line segments 111 and multiple negative grid line segments 121 on the other side edge of the adjacent photovoltaic cell 10 along the second direction B. The second edge welding strip 24 and the multiple positive grid line segments 111 on the other side edge of the adjacent photovoltaic cell 10 along the second direction B are separated by a second insulating member 26, and the second edge welding strip 24 and the multiple negative grid line segments 121 on the other side edge of the adjacent photovoltaic cell 10 along the second direction B are electrically connected through a second welding member 28.

[0047] The second insulating member 26 is disposed between the second edge welding strip 24 and the photovoltaic cell 10 along the thickness direction of the photovoltaic cell 10, and the second insulating member 26 is disposed at a plurality of positive electrode avoidance openings 112 adjacent to the other side edge of the photovoltaic cell 10 along the second direction B, and the second edge welding strip 24 is separated from a plurality of positive electrode gridline segments 111 adjacent to the other side edge of the photovoltaic cell 10 along the second direction B by the second insulating member 26. The second edge welding strip 24 is electrically connected to a plurality of negative electrode gridline segments 121 adjacent to the other side edge of the photovoltaic cell 10 along the second direction B, and the second welding member 28 is disposed between the second edge welding strip 24 and the plurality of negative electrode gridline segments 121 along the thickness direction of the photovoltaic cell 10, and the second edge welding strip 24 is welded to the plurality of negative electrode gridline segments 121.

[0048] Thus, the first insulating member 25 is used to separate and insulate the first edge welding strip 23 and the negative electrode grid line segment 121, the first welding member 27 is used to connect the first edge welding strip 23 to the positive electrode grid line segment 111, the second insulating member 26 is used to separate and insulate the second edge welding strip 24 from the positive electrode grid line segment 111, and the second welding member 28 is used to connect the second edge welding strip 24 to the negative electrode grid line segment 121. The arrangement of the first insulating member 25 and the second insulating member 26 can prevent the battery string 100 from short-circuiting when the first edge welding strip 23 and the second edge welding strip 24 are electrically connected to the positive electrode grid line segment 111 and the negative electrode grid line segment 121 respectively.

[0049] The first insulating member 25 and the second insulating member 26 also have a bonding function, and can bond the first edge welding strip 23 and the second edge welding strip 24 to the photovoltaic cell 10, so as to prevent the first edge welding strip 23 and the second edge welding strip 24 from falling off the photovoltaic cell 10, and improve the stability of the electrical connection between the first edge welding strip 23 and the positive grid line segment 111, and the second edge welding strip 24 and the negative grid line segment 121, thereby facilitating the long-term normal use of the battery string 100. The provision of the first welding member 27 and the second welding member 28 can enhance the connection strength between the first edge welding strip 23 and the second edge welding strip 24 and the positive grid line segment 111 and the negative grid line segment 121, respectively, thereby improving the reliability of the battery string 100.

[0050] According to some embodiments of the present invention, Figure 2 and Figure 3 As shown, the length of the insulating glue is L 1 , width W 1 , height H 1 , the L 1 , W 1 and H 1 Satisfy respectively: 2mm<L 1 <10mm,0.2mm<W 1 <0.8mm,0.03mm<H1 <0.1mm.

[0051] The length of the insulating glue along the second direction B is L 1 , the width of the insulating glue along the first direction A is W 1 The height of the insulating glue in the thickness direction of the photovoltaic cell 10 is H 1 When the size of the insulating rubber: L 1 <2mm,W 1 <0.2mm,H 1 When the size of the insulating glue is less than 0.03 mm, the volume of the insulating glue is small, and the area covered by the insulating glue at the positive electrode avoidance opening 112 and the negative electrode avoidance opening 122 is small, resulting in poor insulation effect of the insulating glue. The first edge welding strip 23 and the negative electrode grid line segment 121, and the second edge welding strip 24 and the positive electrode grid line segment 111 are easily in contact, so that the battery string 100 is prone to short circuit, which is not conducive to the normal use of the battery string 100. When the size of the insulating glue is: L 1 >10mm,W 1 >0.8mm, H 1 When the size of the insulating glue is larger than 0.03 mm, the volume of the insulating glue is too large, and the area covered by the insulating glue at the positive electrode avoidance opening 112 and the negative electrode avoidance opening 122 is too large, which may easily cause waste of insulating glue materials, thereby increasing the production cost of the battery string 100, and the excess insulating glue may easily cover the positive electrode grid line segment 111 and the negative electrode grid line segment 121, shortening the length of the positive electrode grid line segment 111 and the negative electrode grid line segment 121, and reducing the occupied area of ​​the positive electrode grid line segment 111 and the negative electrode grid line segment 121 on the photovoltaic cell 10, thereby reducing the utilization of the surface of the photovoltaic cell 10, and further reducing the utilization efficiency of the battery string 100. For example, the size of the insulating glue is: L 1 =6mm, W 1 =0.5mm, H 1 =0.06mm.

[0052] Therefore, the size of the insulating glue is limited, and thus the amount of the insulating glue is limited to ensure the insulating effect of the insulating glue, avoid contact between the first edge welding strip 23 and the negative electrode grid line segment 121, and between the second edge welding strip 24 and the positive electrode grid line segment 111, avoid short circuit of the battery string 100, ensure the current transmission performance and production yield of the battery string 100, thereby extending the service life of the battery string 100, and prevent excessive use of the insulating glue to reduce the production cost of the battery string 100.

[0053] According to some embodiments of the present invention, Figure 2 and Figure 3 As shown, the length of solder paste is L 2 , width W 2 , height is H 2 , the L 2 , W 2and H 2 Satisfy respectively: 0.3mm<L 2 <1mm,0.2mm<W 2 <0.5mm,0.03mm<H 2 <0.15mm.

[0054] The length of the solder paste along the second direction B is L 2 , the width of the solder paste along the first direction A is W 2 The height of the solder paste in the thickness direction of the photovoltaic cell 10 is H 2 When the solder paste size: L 2 <0.3mm,W 2 <0.2mm,H 2 When the solder paste size is less than 0.03 mm, the volume of the solder paste is small and the amount of solder paste is large. The solder paste is used for welding between the first edge solder strip 23 and the positive grid line segment 111, and between the first edge solder strip 23 and the negative grid line segment 121. Too little solder paste is not conducive to the connection strength between the first edge solder strip 23 and the positive grid line segment 111, and between the first edge solder strip 23 and the negative grid line segment 121, and is not conducive to the structural strength of the battery string 100. When the size of the solder paste is: L 2 >1mm,W 2 >0.5mm, H 2 When the thickness is larger than 0.15 mm, the volume of solder paste is large and the amount of solder paste used is large. Excessive solder paste will not only cause material waste, but also cause the solder paste to overflow onto the adjacent positive electrode grid line segment 111 or negative electrode grid line segment 121, causing a short circuit in the battery string 100. For example, L 2 =0.7mm, W 2 =0.4mm, H 2 =0.1mm.

[0055] Thus, the size of the solder paste is limited, and thus the amount of solder paste is limited to ensure the connection strength between the first edge solder strip 23 and the positive electrode grid line segment 111, and between the first edge solder strip 23 and the negative electrode grid line segment 121, which is beneficial to the electrical connection between the first edge solder strip 23 and the positive electrode grid line segment 111, and between the first edge solder strip 23 and the negative electrode grid line segment 121, and can also reduce the production cost of the battery string 100, ensure the structural strength of the battery string 100, enhance the reliability of the battery string 100, and extend the service life of the battery string 100.

[0056] According to some embodiments of the present invention, the first insulating member 25 and the second insulating member 26 are insulating glue, respectively, and the first welding member 27 and the second welding member 28 are low-temperature solder paste, respectively.

[0057] Insulation glue is a gel-like material designed to meet the needs of electrical insulation. It has excellent electrical insulation properties, can effectively prevent the passage of current, prevent charge accumulation or leakage, and ensure the safe operation of electrical equipment. Insulation glue has good electrical insulation properties, chemical stability, physical properties, flame retardancy, hydrophobicity, environmental adaptability and a wide temperature range. Low-temperature solder paste is a specially formulated welding material, mainly used in the field of electronic manufacturing, especially in the assembly process where lower welding temperatures are required to protect sensitive components or heat-sensitive substrates. Its main feature is that it has a lower melting point than conventional solder paste, and can achieve good formation of solder joints at lower temperatures, thereby reducing the potential risk of thermal damage to components and circuit boards.

[0058] Therefore, the first insulating member 25 and the second insulating member 26 are insulating glues, which can ensure the insulation effect between the first edge welding strip 23 and the multiple negative grid line segments 121 on the edge of the side of the adjacent photovoltaic cell 10 along the second direction B, and between the second edge welding strip 24 and the multiple positive grid line segments 111 on the edge of the other side of the adjacent photovoltaic cell 10 along the second direction B, thereby avoiding short circuit of the battery string 100 and further improving the reliability of the battery string 100. The first welding member 27 and the second welding member 28 are low-temperature solder pastes, which can protect the photovoltaic cell 10 when the first edge welding strip 23 and the positive grid line segment 111, and the first edge welding strip 23 and the negative grid line segment 121 are welded, thereby avoiding the photovoltaic cell 10 from warping due to high temperature and affecting the quality of the finished product of the battery string 100, thereby improving the reliability of the battery string 100.

[0059] According to some embodiments of the present utility model, as shown in FIG. Figure 5 As shown, the first edge welding strip 23 is arranged on a plurality of positive grid line segments 111 on a side edge of the adjacent photovoltaic cell 10 along the second direction B, the first edge welding strip 23 is located between a side edge of the photovoltaic cell 10 along the second direction B and a plurality of negative grid line segments 121 on a side edge of the adjacent photovoltaic cell 10 along the second direction B, and the first edge welding strip 23 and the plurality of negative grid line segments 121 on a side edge of the adjacent photovoltaic cell 10 along the second direction B are spaced apart from each other.

[0060] The first edge welding strip 23 is electrically connected to a plurality of positive grid line segments 111 disposed on a side edge of the photovoltaic cell 10 along the second direction B, and the first edge welding strip 23 is spaced apart from an end of a side edge of the photovoltaic cell 10 along the second direction B adjacent to a plurality of negative grid line segments 121 disposed on a side edge of the photovoltaic cell 10 along the second direction B.

[0061] The second edge welding strip 24 is arranged on a plurality of negative electrode grid line segments 121 on the other side edge of the adjacent photovoltaic cell 10 along the second direction B. The second edge welding strip 24 is located between the other side edge of the photovoltaic cell 10 along the second direction B and a plurality of positive electrode grid line segments 111 on the other side edge of the adjacent photovoltaic cell 10 along the second direction B. The second edge welding strip 24 and the plurality of positive electrode grid line segments 111 on the other side edge of the adjacent photovoltaic cell 10 along the second direction B are spaced apart from each other.

[0062] The second edge welding strip 24 is electrically connected to a plurality of negative electrode grid line segments 121 disposed on the other side edge of the photovoltaic cell 10 along the second direction B, and the second edge welding strip 24 is spaced apart from an end of a plurality of positive electrode grid line segments 111 disposed on the other side edge of the photovoltaic cell 10 along the second direction B that is adjacent to the other side edge of the photovoltaic cell 10 along the second direction B.

[0063] Therefore, the first edge welding strip 23 and the second edge welding strip 24 are arranged adjacent to the two side edges of the photovoltaic cell 10 along the second direction B, which can increase the number of welding strips 20 to a certain extent, improve the current collection capacity of the battery string 100, and reduce the amount of insulating glue and solder paste used, reduce the production process steps of the battery string 100, and reduce the production cost of the battery string 100.

[0064] According to some embodiments of the present invention, Figure 4 and Figure 5 As shown, the distance between the first edge welding strip 23 and the edge of one side of the photovoltaic cell 10 along the second direction B is D 1 , D 1 Satisfy: 0.5mm<D 1 <1.5mm; the distance between the second edge welding strip 24 and the other side edge of the photovoltaic cell 10 along the second direction B is D 2 , D 2 Satisfy: 0.5mm<D 2 <1.5mm.

[0065] When the distance D between the first edge welding strip 23 and one side edge of the photovoltaic cell 10 along the second direction B is 1 <0.5mm, the distance between the second edge welding strip 24 and the other side edge of the second direction B of the photovoltaic cell 10 is D 2When the thickness of the photovoltaic cell 10 is less than 0.5 mm, the distance between the first edge welding strip 23 and the edge of one side of the photovoltaic cell 10 along the second direction B is small, and the distance between the second edge welding strip 24 and the edge of the other side of the photovoltaic cell 10 along the second direction B is small, which makes it inconvenient to set the first edge welding strip 23 at the edge of one side of the photovoltaic cell 10 along the second direction B, and it is inconvenient to set the second edge welding strip 24 at the edge of the other side of the photovoltaic cell 10 along the second direction B, thereby increasing the production difficulty of the battery string 100.

[0066] When the distance D between the first edge welding strip 23 and one side edge of the photovoltaic cell 10 along the second direction B is 1 >1.5mm, the distance between the second edge welding strip 24 and the other side edge of the photovoltaic cell 10 in the second direction B is D 2 When the distance between the first edge welding strip 23 and the edge of one side of the photovoltaic cell 10 along the second direction B is larger, and the distance between the second edge welding strip 24 and the edge of the other side of the photovoltaic cell 10 along the second direction B is larger, which reduces the number of welding strips 20 arranged on the photovoltaic cell 10, and also reduces the number of positive grid lines 11 and negative grid lines 12 arranged on the photovoltaic cell 10, which is not conducive to improving the photoelectric conversion capacity and current collection capacity of the battery string 100. For example, D 1 =1mm, D 2 =1mm.

[0067] Therefore, by limiting the distance between the first edge welding strip 23 and the second edge welding strip 24 and the two side edges of the photovoltaic cell 10 along the second direction B, the difficulty of welding the first edge welding strip 23 and the second edge welding strip 24 to the photovoltaic cell 10 can be reduced, the production difficulty of the battery string 100 can be reduced, the surface utilization rate of the photovoltaic cell 10 can be ensured, and the performance of the battery string 100 can be improved.

[0068] According to some embodiments of the present invention, Figure 1-Figure 5 As shown, a first edge grid line 113 and a second edge grid line 123 are further provided on a surface of one side of the photovoltaic cell 10, and the first edge grid line 113 and the second edge grid line 123 both extend along the first direction A, and the first edge grid line 113 and the second edge grid line 123 are respectively located on both sides of the plurality of positive grid lines 11 and the plurality of negative grid lines 12 along the second direction B, the first edge grid line 113 is spaced apart from one end of the plurality of negative grid lines 12 along the second direction B, the first edge grid line 113 is connected to one end of the plurality of positive grid lines 11 along the second direction B, the second edge grid line 123 is spaced apart from the other end of the plurality of positive grid lines 11 along the second direction B, and the second edge grid line 123 is connected to the other end of the plurality of negative grid lines 12 along the second direction B.

[0069] Combination Figure 1The first edge grid line 113 extends along the first direction A, and the first edge grid line 113 is connected to one end of the plurality of positive grid lines 11 along the second direction B, and the first edge grid line 113 is spaced apart from one end of the plurality of negative grid lines 12 along the second direction B. The second edge grid line 123 is opposite to the first edge grid line 113 along the second direction B, and the second edge grid line 123 extends along the first direction A, and the second edge grid line 123 is connected to the other end of the plurality of negative grid lines 12 along the second direction B, and the second edge grid line 123 is spaced apart from the other end of the plurality of positive grid lines 11 along the second direction B.

[0070] For example, in Figure 1 In the example, the right ends of the plurality of positive grid lines 11 are electrically connected to the first edge grid lines 113, respectively, and the right ends of the plurality of negative grid lines 12 are spaced apart from the first edge grid lines 113, respectively. The left ends of the plurality of negative grid lines 12 are electrically connected to the second edge grid lines 123, respectively, and the left ends of the plurality of positive grid lines 11 are spaced apart from the second edge grid lines 123, respectively. With such a configuration, compared with the cell in the conventional technology, no main grid line is provided on the photovoltaic cell 10, thereby reducing the amount of slurry used to make the grid lines of the photovoltaic cell 10, thereby reducing the production cost of the photovoltaic cell 10, simplifying the production steps of the photovoltaic cell 10, and improving the production efficiency of the photovoltaic cell 10. In addition, it also avoids the main grid line collecting current and transmitting it to the pad point for output through the secondary grid lines (i.e., the positive grid lines 11 and the negative grid lines 12), thereby reducing the resistance of the photovoltaic cell 10, thereby increasing the power of the photovoltaic cell 10, and improving the performance of the photovoltaic cell 10.

[0071] In addition, the first edge grid line 113 can collect the current of multiple positive grid lines 11, and the second edge grid line 123 can collect the current of multiple negative grid lines 12, so as to facilitate the current convergence and the use of the current. For example, when the end of the positive grid line 11 close to the first edge grid line 113 is broken, the positive grid line 11 connected to the first edge grid line 113 can output the current through the first edge grid line 113. When the end of the negative grid line 12 close to the second edge grid line 123 is broken, the negative grid line 12 connected to the second edge grid line 123 can output the current through the second edge grid line 123, thereby reducing the current loss of the photovoltaic cell 10, and then improving the reliability of the use of the photovoltaic cell 10. In addition, the arrangement of the positive grid line 11, the negative grid line 12, the first edge grid line 113 and the second edge grid line 123 is reasonable and simple, which is more conducive to the use of the photovoltaic cell 10. Furthermore, by setting the right ends of the plurality of negative pole grid lines 12 to be spaced apart from the first edge grid line 113, and the left ends of the plurality of positive pole grid lines 11 to be spaced apart from the second edge grid line 123, the contact between the negative pole grid line 12 and the first edge grid line 113 and the contact between the positive pole grid line 11 and the second edge grid line 123 can be avoided, thereby avoiding a short circuit. It should be noted that the photovoltaic cell 10 can be a back contact cell. But it is not limited thereto.

[0072] According to some embodiments of the present invention, Figure 1 As shown, the distance between the first edge grid line 113 and one end of the plurality of negative grid lines 12 along the second direction B is D 3 , D 3 Satisfy: 0.2mm<D 3 <0.8mm; the distance between the second edge grid line 123 and the other end of the plurality of positive grid lines 11 along the second direction B is D 4 , D 4 Satisfy: 0.2mm<D 4 <0.8mm.

[0073] When the first edge gate line 113 is spaced apart from one end of the plurality of negative gate lines 12 along the second direction B by a distance D 3 <0.2 mm, the distance D between the second edge grid line 123 and the other end of the plurality of positive grid lines 11 along the second direction B 4 When the thickness of the photovoltaic cell 10 is less than 0.2 mm, the distance between the first edge grid line 113 and one end of the plurality of negative grid lines 12 along the second direction B is relatively small, which makes it inconvenient to arrange the first edge welding strip 23 at one side edge of the photovoltaic cell 10 along the second direction B. The distance between the second edge grid line 123 and the other end of the plurality of positive grid lines 11 along the second direction B is relatively small, which makes it inconvenient to arrange the second edge welding strip 24 at the other side edge of the photovoltaic cell 10 along the second direction B, thereby increasing the production difficulty of the battery string 100.

[0074] When the first edge gate line 113 is spaced apart from one end of the plurality of negative gate lines 12 along the second direction B by a distance D 3 >0.8 mm, the distance D between the second edge grid line 123 and the other end of the plurality of positive grid lines 11 along the second direction B 4 When the value is greater than 0.8 mm, the first edge grid line 113 is spaced apart from one end of the plurality of negative grid lines 12 along the second direction B by a large distance, and the second edge grid line 123 is spaced apart from the other end of the plurality of positive grid lines 11 along the second direction B by a large distance, which is not conducive to increasing the number of positive grid lines 11 and negative grid lines 12 arranged on the photovoltaic cell 10, and is not conducive to improving the surface utilization rate of the photovoltaic cell 10.

[0075] Thus, by limiting the distance between the first edge grid line 113 and one end of the plurality of negative grid lines 12 along the second direction B and the distance between the second edge grid line 123 and the other end of the plurality of positive grid lines 11 along the second direction B, it is possible to avoid electrical connection between the first edge welding strip 23 and the positive grid line 11 and the second edge welding strip 24 and the negative grid line 12, thereby avoiding short circuits. There is no risk of short circuits during the support process of the battery string 100, thereby ensuring the transmission performance and production yield of the battery string 100. At the same time, the number of positive grid lines 11 and negative grid lines 12 arranged on the photovoltaic cell sheet 10 can be reasonable, thereby improving the photoelectric conversion capacity of the photovoltaic cell sheet 10, thereby improving the performance of the battery string 100.

[0076] According to some embodiments of the present invention, the positioning member 30 includes dot-shaped film dots or glue dots, and the positioning member 30 covers the intersection of the welding strip 20 and the positive electrode grid line 11 or the negative electrode grid line 12 .

[0077] The positioning member 30 is a dot-shaped film dot, which means that a special thin film material is applied to the photovoltaic cell 10 in a dot-shaped form. The dot-shaped film dot can be precisely cut and attached to a preset position. The dot-shaped film dot is suitable for covering the side of the welding strip 20 away from the photovoltaic cell 10 and is arranged at the intersection of the welding strip 20 and the positive grid line 11 or the negative grid line 12, playing a role of fixing and aligning. The positioning member 30 is a glue dot, which means a dot-shaped bonding structure formed at a specified position using an adhesive. The glue dot is suitable for forming between the welding strip 20 and the positive grid line 11 or the negative grid line 12. After curing, the glue dot can firmly fix the positional relationship between the welding strip 20 and the grid line to prevent displacement in subsequent processes.

[0078] Therefore, the positioning member 30 can be a dot-shaped film point or a glue point to ensure that the welding strip 20 is accurately docked with the positive grid line 11 or the negative grid line 12, avoiding problems such as poor electrical contact and increased resistance caused by position deviation, which affect the current collection efficiency of the photovoltaic cell 10. In addition, the setting of the dot-shaped film point or glue point can reduce the amount of glue film or adhesive, saving the production cost of the battery string 100. The positioning member 30 can play the role of positioning, fixing and protection, ensuring that the welding strip 20 is accurately and stably docked with the positive grid line 11 or the negative grid line 12, and ensuring the overall performance of the battery string 100.

[0079] According to some embodiments of the utility model, the positioning member 30 includes a strip of film or a strip of adhesive tape, the positioning member 30 extends along the first direction A, and the positioning member 30 covers the welding strip 20; or the positioning member 30 extends along the second direction B, and the positioning member 30 covers the positive electrode grid line 11 or the negative electrode grid line 12.

[0080] The positioning member 30 is a strip film tape, which means that the positioning member 30 is a thin film material in the form of a long strip, which may be self-adhesive or specially treated, and is used for positioning on the photovoltaic cell 10. The strip film tape is laid along a specific direction (such as the first direction A or the second direction B), and its function is similar to the above-mentioned point film point, but the coverage is wider and it is suitable for large-area, continuous positioning needs. Similarly, the strip tape is a long strip bonding structure formed by an adhesive, which is laid on the photovoltaic cell 10 along a specific direction to fix and align related components. Compared with point-shaped glue points, the strip tape provides a larger area of ​​bonding support and is suitable for application scenarios that require continuous positioning.

[0081] Therefore, the strip film tape or the strip adhesive tape serves as a positioning member 30, extending along the first direction A or the second direction B respectively, and is used to cover the welding strip 20 or the positive pole grid line 11 and the negative pole grid line 12, so as to achieve accurate and continuous positioning of key components in the photovoltaic cell 10, thereby ensuring the smooth progress of the welding process and the electrical performance of the cell.

[0082] According to some embodiments of the present invention, Figure 3 and Figure 5 As shown, the positioning member 30 covers one side surface of the photovoltaic cell 10 .

[0083] The positioning piece 30 covers one side surface of the photovoltaic cell 10 in the thickness direction. The positioning piece 30 is fixed to the one side surface of the photovoltaic cell 10 by means of heat cross-linking bonding. Pre-heating cross-linking bonding is a special bonding process involving the use of an adhesive that can undergo a cross-linking reaction at a specific temperature. By pre-heating the bonding parts, the cross-linking reaction between the adhesive molecules is promoted, thereby forming a high-strength and durable bonding structure.

[0084] Thus, the positioning member 30 covers one side surface of the photovoltaic cell, and can position, fix and protect the positive grid line 11, the negative grid line 12 and the multiple welding strips 20 located on the one side surface of the photovoltaic cell, ensuring that the positive grid line 11, the negative grid line 12 and the multiple welding strips 20 and other components are accurately aligned, preventing them from being displaced in subsequent processes, ensuring good electrical contact, protecting the overall performance of the battery string 100, and extending the service life of the battery string 100.

[0085] According to some embodiments of the present invention, Figure 1 As shown, there are multiple photovoltaic cells 10 , and the multiple photovoltaic cells 10 are electrically connected through multiple welding strips 20 , and the positioning member 30 covers the multiple photovoltaic cells 10 .

[0086] A plurality of photovoltaic cells 10 are arranged at intervals along a first direction A, a plurality of welding strips 20 extend along the first direction A, a plurality of welding strips 20 are arranged at intervals along a second direction B, the same welding strip 20 electrically connects two adjacent photovoltaic cells 10, and each welding strip 20 is electrically connected to a plurality of corresponding positive grid lines 11 of the same polarity or to a plurality of corresponding negative grid lines 12 of the same polarity. In this arrangement, the current on the plurality of positive grid lines 11 is collected through a corresponding portion of the welding strips 20, and the current on the plurality of negative grid lines 12 is collected through another corresponding portion of the welding strips 20, thereby improving the current collection capacity of the battery string 100. The positioning member 30 covers a plurality of photovoltaic cells 10, which can improve the structural stability of the photovoltaic cells 10, enhance the overall structural stability of the battery string 100, and extend the service life of the battery string 100.

[0087] According to some embodiments of the present invention, Figure 2-Figure 5 As shown, the welding strip 20 is a circular welding strip 20, and the diameters d, d of the welding strip 20 satisfy: 0.15mm≤d≤0.35mm.

[0088] The circular welding strip 20 generally refers to a welding material with a circular cross-section, and the circular welding strip 20 has good electrical conductivity and welding performance. If the diameter of the welding strip 20 is greater than 0.35 mm, the diameter of the welding strip 20 is too large, so that the welding area between the welding strip 20 and the positive electrode grid line 11 or the negative electrode grid line 12 is too large, resulting in more heat generated during welding, causing the insulating glue to shrink and warp. A large diameter of the welding strip 20 will also increase the production cost of the battery string 100. If the diameter of the welding strip 20 is less than 0.15 mm, the diameter of the welding strip 20 is too small, so that the structural strength of the welding strip 20 is too low, and it is easy to break during welding. If the diameter of the welding strip 20 is too small, the resistance of the welding strip 20 will be relatively large, and the current carrying capacity of the welding strip 20 will be relatively weak, resulting in increased power loss during current transmission.

[0089] Thus, the diameter range of the welding ribbon 20 is limited to ensure the structural strength of the welding ribbon 20 , while ensuring the structural strength of the battery string 100 , preventing damage and power loss of the photovoltaic cell 10 , and ensuring the electrical performance of the battery string 100 .

[0090] The photovoltaic assembly according to the second embodiment of the utility model includes the battery string 100 in the above embodiment.

[0091] According to the photovoltaic module of the present invention, by adopting the above-mentioned battery string 100, the production cost of the photovoltaic module is reduced, the power generation of the photovoltaic module is improved, the probability of damage to the battery cell during the production process is reduced, the warping phenomenon that may occur after the battery cell is welded is reduced, the overall structural strength of the photovoltaic module is improved, the electrical performance of the photovoltaic module is guaranteed, and the service life of the photovoltaic module is extended.

[0092] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0093] In the description of the present utility model, "first feature" and "second feature" may include one or more of the features. In the description of the present utility model, "plurality" means two or more. In the description of the present utility model, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. In the description of the present utility model, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0094] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0095] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery string, characterized in that: include: A photovoltaic cell sheet, wherein a plurality of positive grid lines and a plurality of negative grid lines are arranged on a surface of one side of the photovoltaic cell sheet, the plurality of positive grid lines and the plurality of negative grid lines are alternately arranged along a first direction and extend along a second direction, each of the positive grid lines comprises a plurality of positive grid line segments spaced apart along the second direction, a positive avoidance opening is defined between two adjacent positive grid line segments, a plurality of positive avoidance openings of the plurality of positive grid lines are respectively opposite to each other along the first direction, each of the negative grid lines comprises a plurality of negative grid line segments spaced apart along the second direction, a negative avoidance opening is defined between two adjacent negative grid line segments, a plurality of negative avoidance openings of the plurality of negative grid lines are respectively opposite to each other along the first direction, the positive avoidance openings and the negative avoidance openings are staggeredly arranged along the first direction, and the first direction is perpendicular to the second direction; A plurality of welding strips, wherein the plurality of welding strips are arranged at intervals along the second direction, and the plurality of welding strips all extend along the first direction, and the plurality of welding strips include a plurality of middle welding strips, a first edge welding strip, and a second edge welding strip, and the plurality of middle welding strips include at least one first middle welding strip and at least one second middle welding strip, the first middle welding strip is located at the negative electrode avoidance opening and is spaced apart from the adjacent negative electrode grid line segments, the first middle welding strip is electrically connected to the plurality of positive electrode grid line segments, the second middle welding strip is located at the positive electrode avoidance opening and is spaced apart from the adjacent positive electrode grid line segments, the second middle welding strip is electrically connected to the plurality of negative electrode grid line segments, the first edge welding strip and the second edge welding strip are respectively located at both sides of the plurality of middle welding strips along the second direction, the first edge welding strip is spaced apart from the negative electrode grid line and is electrically connected to the positive electrode grid line, and the second edge welding strip is spaced apart from the positive electrode grid line and is electrically connected to the negative electrode grid line; A positioning member is provided on a side of the plurality of welding strips away from the photovoltaic cell sheet to limit the movement of the welding strips relative to the photovoltaic cell sheet.

2. The battery string according to claim 1, characterized in that: The first edge welding strip is provided on a plurality of the positive gridline segments and a plurality of the negative gridline segments adjacent to the edge of one side of the photovoltaic cell along the second direction, the first edge welding strip is separated from the plurality of the negative gridline segments adjacent to the edge of one side of the photovoltaic cell along the second direction by a first insulating member, and the first edge welding strip is electrically connected to the plurality of the positive gridline segments adjacent to the edge of one side of the photovoltaic cell along the second direction by a first welding member; The second edge welding strip is arranged on the multiple positive grid line segments and the multiple negative grid line segments adjacent to the photovoltaic cell edge on the other side along the second direction, and the second edge welding strip is separated from the multiple positive grid line segments adjacent to the photovoltaic cell edge on the other side along the second direction by a second insulating member, and the second edge welding strip is electrically connected to the multiple negative grid line segments adjacent to the photovoltaic cell edge on the other side along the second direction via a second welding member.

3. The battery string according to claim 2, characterized in that: The insulating glue has a length of L1, a width of W1, and a height of H1, and L1, W1, and H1 respectively satisfy the following conditions: 2mm<L1<10mm, 0.2mm<W1<0.8mm, and 0.03mm<H1<0.1mm.

4. The battery string according to claim 2, characterized in that: The solder paste has a length of L2, a width of W2, and a height of H2, and L2, W2, and H2 respectively satisfy: 0.3 mm < L2 < 1 mm, 0.2 mm < W2 < 0.5 mm, and 0.03 mm < H2 < 0.15 mm.

5. The battery string according to claim 2, characterized in that: The first insulating member and the second insulating member are insulating glue respectively, and the first welding member and the second welding member are low-temperature solder paste respectively.

6. The battery string according to claim 2, characterized in that: The first edge welding strip is provided on the plurality of positive gridline segments adjacent to the one side edge of the photovoltaic cell along the second direction, the first edge welding strip is located between the one side edge of the photovoltaic cell along the second direction and the plurality of negative gridline segments adjacent to the one side edge of the photovoltaic cell along the second direction, and the first edge welding strip and the plurality of negative gridline segments adjacent to the one side edge of the photovoltaic cell along the second direction are spaced apart from each other; The second edge welding band is arranged on the multiple negative pole grid line segments adjacent to the other side edge of the photovoltaic cell along the second direction, the second edge welding band is located between the other side edge of the photovoltaic cell along the second direction and the multiple positive pole grid line segments adjacent to the other side edge of the photovoltaic cell along the second direction, and the second edge welding band and the multiple positive pole grid line segments adjacent to the other side edge of the photovoltaic cell along the second direction are spaced apart from each other.

7. The battery string according to claim 2, characterized in that: The distance between the first edge welding strip and the edge of the photovoltaic cell along the second direction is D1, and D1 satisfies: 0.5 mm<D1<1.5 mm; A distance between the second edge welding strip and the other side edge of the photovoltaic cell along the second direction is D2, and D2 satisfies: 0.5 mm<D2<1.5 mm.

8. The battery string according to claim 1, characterized in that: A first edge grid line and a second edge grid line are also provided on the surface of one side of the photovoltaic cell sheet, the first edge grid line and the second edge grid line both extend along the first direction, the first edge grid line and the second edge grid line are respectively located on both sides of the plurality of positive grid lines and the plurality of negative grid lines along the second direction, the first edge grid line is spaced apart from one end of the plurality of negative grid lines along the second direction, the first edge grid line is connected to one end of the plurality of positive grid lines along the second direction, the second edge grid line is spaced apart from the other end of the plurality of positive grid lines along the second direction, and the second edge grid line is connected to the other end of the plurality of negative grid lines along the second direction.

9. The battery string according to claim 8, characterized in that: The first edge grid line is spaced apart from one end of the plurality of negative grid lines along the second direction by a distance D3, and D3 satisfies: 0.2 mm<D3<0.8 mm; The second edge grid line is spaced apart from the other ends of the plurality of positive grid lines along the second direction by a distance D4, and D4 satisfies: 0.2 mm<D4<0.8 mm.

10. The battery string according to claim 1, characterized in that: The positioning member includes a dot-shaped film point or a glue point, and the positioning member covers the intersection of the welding strip and the positive electrode grid line or the negative electrode grid line.

11. The battery string according to claim 1, characterized in that: The positioning member comprises a strip of film or a strip of adhesive tape, The positioning member extends along the first direction, and the positioning member covers the welding strip; or The positioning member extends along the second direction, and the positioning member covers the positive electrode grid line or the negative electrode grid line.

12. The battery string according to claim 1, characterized in that: The positioning member covers the one side surface of the photovoltaic cell sheet.

13. The battery string according to claim 1, characterized in that: There are multiple photovoltaic cells, and the multiple photovoltaic cells are electrically connected through multiple welding strips. The positioning member covers a plurality of the photovoltaic cells.

14. The battery string according to any one of claims 1 to 13, characterized in that: The welding strip is a circular welding strip, and the diameter d of the welding strip satisfies: 0.15mm≤d≤0.35mm.

15. A photovoltaic module, characterized in that: Comprising a battery string according to any one of claims 1-14.

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