A solar cell

Abstract

The present application discloses a solar cell, which includes a cell, a plurality of first sub-grids, a plurality of first grid line groups, a plurality of second sub-grids and a plurality of second grid line groups, wherein the plurality of first sub-grids are printed on a first surface at intervals along a first direction and extend along a second direction, and the plurality of first grid line groups are printed on the first surface at intervals along a second direction, and the first grid line group includes a plurality of first grid line frames, and each first grid line frame connects at least two adjacent first sub-grids; the plurality of second sub-grids are printed on a second surface at intervals along a first direction and extend along a second direction; the plurality of second grid line groups are printed on the second surface at intervals along a second direction, and the second grid line group includes a plurality of second grid line frames, and each second grid line frame connects at least two adjacent second sub-grids, and in the thickness direction of the cell, at least part of the projection of the second grid line frame on the first surface is staggered with the first grid line frame. The present application can reduce the production cost of the solar cell.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a solar cell. Background Art

[0002] Solar cells convert sunlight directly into electrical energy without producing any pollutants, so solar cells are gaining more and more attention. In the preparation process of solar cells, electrode paste needs to be printed on the surface of solar cells and dried to form metallized contacts to conduct current. In the production of solar cells, a large amount of electrode paste is consumed, resulting in a high production cost of solar cells. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides a solar cell, which can reduce the production cost of the solar cell.

[0004] In order to solve the above technical problems, the utility model provides a solar cell, comprising:

[0005] A battery cell, the battery cell having a first surface and a second surface opposite to each other;

[0006] A plurality of first sub-grids, which are printed on the first surface at intervals along a first direction and extend along a second direction, wherein the second direction is perpendicular to the first direction and parallel to the first surface;

[0007] A plurality of first grid line groups, wherein the plurality of first grid line groups are printed on the first surface at intervals along the second direction, the first grid line groups include a plurality of first grid line frames, and each of the first grid line frames connects at least two adjacent first sub-grids;

[0008] A plurality of second auxiliary grids, wherein the plurality of second auxiliary grids are printed on the second surface at intervals along the first direction and extend along the second direction;

[0009] A plurality of second grid line groups are printed on the second surface at intervals along the second direction, the second grid line groups include a plurality of second grid line frames, each of the second grid line frames connects at least two adjacent second sub-grids, and in the thickness direction of the battery cell, the projections of at least some of the second grid line frames on the first surface are staggered from the first grid line frames.

[0010] In a possible implementation manner, the battery cell has a first side edge and a second side edge that are opposite to each other in the first direction;

[0011] The plurality of first gate wire frames include two first sub-gate wire frames and a plurality of second sub-gate wire frames, the two first sub-gate wire frames are respectively arranged close to the first side edge and the second side edge, and the plurality of second sub-gate wire frames are arranged between the two first sub-gate wire frames;

[0012] The second grid wire frame includes two third sub-grid wire frames and multiple fourth sub-grid wire frames, the two third sub-grid wire frames are respectively arranged close to the first side and the second side, and the multiple fourth sub-grid wire frames are arranged between the two third sub-grid wire frames. In the thickness direction of the battery cell, the projection of the fourth sub-grid wire frame on the first surface is staggered with the second sub-grid wire frame.

[0013] In a possible implementation, two of the first sub-grid line frames and a plurality of the second sub-grid line frames in each group of the first grid line groups are arranged at intervals along the first direction; and / or,

[0014] The two third sub-grid line frames and the plurality of fourth sub-grid line frames in each group of the second grid line groups are arranged at intervals along the first direction.

[0015] In a possible implementation manner, the second sub-grid frame connects two adjacent first sub-grids, and / or the fourth sub-grid frame connects two adjacent second sub-grids.

[0016] In a possible implementation, the first sub-grid frame connects at least three first sub-grids near the first side or the second side, and / or the third sub-grid frame connects at least three second sub-grids near the first side or the second side.

[0017] In a possible implementation, the first sub-grid frame in each two adjacent groups of the first grid line groups has a different length in the first direction, and the first sub-grid frame is connected to the second sub-grid frame close to the first side or the second side, and / or, the third sub-grid frame in each two adjacent groups of the second grid line groups has a different length in the first direction, and the third sub-grid frame is connected to the fourth sub-grid frame close to the first side or the second side.

[0018] In a possible implementation, the second sub-grid frame and the fourth sub-grid frame are both square frame structures, and the widths of the frame edges of the second sub-grid frame and the fourth sub-grid frame parallel to the second direction are greater than the widths of the frame edges parallel to the first direction.

[0019] In a possible implementation manner, a widened portion is printed on welding positions of the frame edges of the second sub-grid frame and the fourth sub-grid frame parallel to the second direction.

[0020] In a possible implementation, the first auxiliary grid between each adjacent two second sub-grid grid frames in each group of the first grid line groups is provided with a first widening section; and / or,

[0021] A second widening section is provided at a welding position of the second auxiliary grid between each adjacent two fourth sub-grid frames in each group of the second grid line groups.

[0022] In a possible implementation, in the first direction, two ends of the first widened segment are respectively flush with the frame edge of the second sub-grid frame or located within two ends of the frame edge of the second sub-grid frame; and / or,

[0023] In the first direction, two ends of the second widened section are respectively flush with the frame edge of the fourth sub-grid frame or located within two ends of the frame edge of the fourth sub-grid frame.

[0024] Compared with the prior art, this application has at least the following beneficial effects:

[0025] Since the plurality of first sub-grids are arranged on the first surface of the battery cell, and the first grid wire frame arranged on the first surface is used to connect at least two adjacent first sub-grids, the first grid wire frame can collect the current on the at least two adjacent first sub-grids connected to facilitate transmission to the first welding strip, and the arrangement of the first grid wire frame can not only improve the conductivity between the at least two adjacent first sub-grids connected thereto, but also improve the tensile performance of the first welding strip when the first grid wire frame is welded to the first welding strip. Similarly, the plurality of second sub-grids are arranged on the second surface of the battery cell, and the second grid wire frame arranged on the second surface is used to connect at least two adjacent second sub-grids. Therefore, the second grid wire frame can collect the current on at least two adjacent second sub-grids connected thereto so as to facilitate transmission to the second welding strip, and the setting of the second grid wire frame can not only improve the conductivity between the at least two adjacent second sub-grids connected thereto, but also improve the tensile performance of the second welding strip when the second grid wire frame is welded to the second welding strip. It can be seen that the main grid is not printed on the first surface and the second surface of the battery cell in this embodiment. Compared with the battery cell in which the main grid and the sub-grid are printed at the same time in the related art, the main grid is eliminated in this embodiment, which is beneficial to reduce the consumption of silver paste of the main grid material and reduce the production cost of solar cells.

[0026] In addition, by eliminating the main grid, on the one hand, the main grid's shielding of sunlight can be reduced, thereby improving the photoelectric conversion efficiency of the solar cell. On the other hand, the local higher glue points at the intersection of the first sub-grid and the main grid and the local higher glue points at the intersection of the second sub-grid and the main grid are eliminated, thereby avoiding the occurrence of cold solder joints when the first sub-grid is welded to the first welding strip and when the second sub-grid is welded to the second welding strip.

[0027] In addition, since the projection of at least part of the second grid wire frame on the first surface is offset from the first grid wire frame in the thickness direction of the battery cell, the overlap between the welding points of the first grid wire frame and the first welding strip on the first surface and the welding points of the second grid wire frame and the second welding strip on the second surface is avoided, which causes the local thickness of the battery cell to increase, thereby preventing the battery cell from being broken into pieces due to large local stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A front view of a solar cell provided by an embodiment of the utility model;

[0030] Figure 2 A rear view of a solar cell provided by an embodiment of the utility model;

[0031] Figure 3 A simplified side view of a solar cell provided in an embodiment of the utility model;

[0032] Figure 4 for Figure 1 A local enlarged schematic diagram of the middle A;

[0033] Figure 5 for Figure 2 A partial enlarged schematic diagram of point B in the middle;

[0034] Figure 6 for Figure 1 A partial enlarged schematic diagram of point D in the middle;

[0035] Figure 7 for Figure 2 A partial enlarged schematic diagram of point E in the middle;

[0036] Figure 8 for Figure 4 A partial enlarged schematic diagram of point F in the middle;

[0037] Fig. 9 for Figure 5 A partial enlarged schematic diagram of point C in the middle.

[0038] Description of reference numerals:

[0039] 100-Solar cell;

[0040] 110 - battery cell; 111 - first surface; 112 - second surface; 113 - first side edge; 114 - second side edge;

[0041] 120-first auxiliary grid; 121-first widening section;

[0042] 130 - first grid line group; 131 - first grid line frame; 1311 - first sub-grid line frame; 1312 - second sub-grid line frame; 1313 - widening portion;

[0043] 140 - second auxiliary grid; 141 - second widening section;

[0044] 150 - second gate line group; 151 - second gate line frame; 1511 - third sub-gate line frame; 1512 - fourth sub-gate line frame. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] In the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0047] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0048] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0049] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0050] The present application is described in detail below through specific embodiments:

[0051] See also Figure 1 , Figure 2 and Figure 3 The embodiment of the present application provides a solar cell 100, which includes a cell 110, a plurality of first auxiliary grids 120, a plurality of first grid line groups 130, a plurality of second auxiliary grids 140 and a plurality of second grid line groups 150. The cell 110 has a first surface 111 and a second surface 112 opposite to each other; the plurality of first auxiliary grids 120 are printed on the first surface 111 at intervals along a first direction and extend along a second direction, the second direction is perpendicular to the first direction and parallel to the first surface 111; the plurality of first grid line groups 130 are printed on the first surface 111 at intervals along the second direction, the first grid line groups 130 are printed on the first surface 111 at intervals along the second direction, and the first grid line groups 130 are printed on the second surface 111 at intervals. 0 includes a plurality of first grid line frames 131, and each first grid line frame 131 connects at least two adjacent first sub-grids 120; a plurality of second sub-grids 140 are printed on the second surface 112 at intervals along the first direction and extend along the second direction; a plurality of second grid line groups 150 are printed on the second surface 112 at intervals along the second direction, and the second grid line group 150 includes a plurality of second grid line frames 151, and each second grid line frame 151 connects at least two adjacent second sub-grids 140, and in the thickness direction of the battery cell 110, the projection of at least part of the second grid line frames 151 on the first surface 111 is staggered from the first grid line frames 131.

[0052] The first surface 111 and the second surface 112 of the battery cell 110 refer to two surfaces that are opposite to each other in the thickness direction of the battery cell 110 , and cannot be understood as an indication of a sequential order.

[0053] The above-mentioned multiple first sub-grids 120 and multiple second sub-grids 140 all refer to three or more first sub-grids 120 and second sub-grids 140, and the number of first sub-grids 120 and the number of second sub-grids 140 can be equal or unequal. The above-mentioned multiple groups of first sub-grids 120 and multiple groups of second gate line groups 150 all refer to three or more first gate line groups 130 and second gate line groups 150, and the number of first gate line groups 130 and the number of second gate line groups 150 can be equal or unequal. Similarly, multiple first gate line frames 131 and multiple second gate line frames 151 all refer to three or more first gate line frames 131 and second gate line frames 151.

[0054] In addition, the cell 110 is made of silicon wafers and is used to convert solar energy into electrical energy. Figure 1 The X arrow in the middle indicates the width direction of the battery cell 110, which is also the first direction. Figure 1 The Y arrow in the middle indicates the length direction of the battery cell 110, which is also the second direction. The first auxiliary grid 120 is printed on the first surface 111 by silver paste, and the second auxiliary grid 140 is printed on the second surface 112 by silver paste, and both the first auxiliary grid 120 and the second auxiliary grid 140 play the role of conducting the circuit. The first grid line group 130 is used to connect the first auxiliary grid 120 and the first welding strip, and similarly, the second grid line group 150 is used to connect the second auxiliary grid 140 and the second welding strip.

[0055] Since the plurality of first sub-grids 120 are arranged on the first surface 111 of the battery cell 110, and the first grid wire frame 131 arranged on the first surface 111 is used to connect at least two adjacent first sub-grids 120, the first grid wire frame 131 can collect the currents on the at least two adjacent first sub-grids 120 connected to facilitate transmission to the first welding strip, and the arrangement of the first grid wire frame 131 can not only improve the conductivity between the at least two adjacent first sub-grids 120 connected thereto, but also improve the tensile performance of the first welding strip when the first grid wire frame 131 is welded to the first welding strip. Similarly, the plurality of second sub-grids 140 are arranged on the second surface 112 of the battery cell 110, and the second grid wire frame 151 arranged on the second surface 112 is used to connect at least two There are two adjacent second sub-grids 140, therefore, the second grid wire frame 151 can collect the current on at least two adjacent second sub-grids 140 connected thereto, so as to facilitate the transmission to the second welding strip, and the setting of the second grid wire frame 151 can not only improve the conductivity between the at least two adjacent second sub-grids 140 connected thereto, but also improve the tensile performance of the second welding strip when the second grid wire frame 151 is welded to the second welding strip. It can be seen that the main grid is not printed on the first surface 111 and the second surface 112 of the battery cell 110 in this embodiment. Compared with the battery cell 110 in the related art that prints the main grid and the sub-grid at the same time, the main grid is eliminated in this embodiment, which is beneficial to reduce the consumption of silver paste of the main grid material and reduce the production cost of the solar cell 100.

[0056] In addition, by eliminating the main grid, on the one hand, the main grid's shielding of sunlight can be reduced, thereby improving the photoelectric conversion efficiency of the solar cell 100. On the other hand, the local higher glue points at the intersection of the first auxiliary grid 120 and the main grid and the local higher glue points at the intersection of the second auxiliary grid 140 and the main grid are eliminated, thereby avoiding the occurrence of cold solder joints when the first auxiliary grid 120 is welded to the first welding strip and when the second auxiliary grid 140 is welded to the second welding strip.

[0057] In addition, since at least part of the projection of the second grid frame 151 on the first surface 111 is offset from the first grid frame 131 in the thickness direction of the battery cell 110, the overlap between the welding points of the first grid frame 131 and the first welding strip on the first surface 111 and the welding points of the second grid frame 151 and the second welding strip on the second surface 112 is avoided, resulting in an increase in the local thickness of the battery cell 110, thereby preventing the battery cell 110 from being broken into pieces due to greater local stress.

[0058] In some possible embodiments, see Figure 4 and Figure 5 The battery cell 110 has a first side 113 and a second side 114 opposite to each other in the first direction; the plurality of first grid wire frames 131 include two first sub-grid wire frames 1311 and a plurality of second sub-grid wire frames 1312, the two first sub-grid wire frames 1311 are respectively arranged close to the first side 113 and the second side 114, and the plurality of second sub-grid wire frames 1312 are arranged between the two first sub-grid wire frames 1311; the second grid wire frame 151 includes two third sub-grid wire frames 1511 and a plurality of fourth sub-grid wire frames 1512, the two third sub-grid wire frames 1511 are respectively arranged close to the first side 113 and the second side 114, and the plurality of fourth sub-grid wire frames 1512 are arranged between the two third sub-grid wire frames 1511, and in the thickness direction of the battery cell 110, the projection of the fourth sub-grid wire frame 1512 on the first surface 111 is staggered with the second sub-grid wire frame 1312.

[0059] The plurality of second sub-grid wire frames 1312 and the plurality of fourth sub-grid wire frames 1512 both refer to two or more second sub-grid wire frames 1312 and fourth sub-grid wire frames 1512 .

[0060] Since the two first sub-grid frames 1311 are respectively arranged close to the first side edge 113 and the second side edge 114, and the two third sub-grid frames 1511 are respectively arranged close to the first side edge 113 and the second side edge 114, the strength of the battery cell 110 close to the first side edge 113 and the second side edge 114 can be improved. In addition, since the projection of the fourth sub-grid frame 1512 on the first surface 111 is staggered with the second sub-grid frame 1312 in the thickness direction of the battery cell 110, the risk of fragmentation in the area between the first side edge 113 and the second side edge 114 of the battery cell 110 due to local thickening can be avoided.

[0061] In some possible embodiments, see Figure 4 and Figure 5 , the two first sub-grid wire frames 1311 and the plurality of second sub-grid wire frames 1312 in each first grid wire group 130 are arranged at intervals along the first direction; and / or, the two third sub-grid wire frames 1511 and the plurality of fourth sub-grid wire frames 1512 in each second grid wire group 150 are arranged at intervals along the first direction.

[0062] A typical battery cell 110 is square or rectangular, so that the two first sub-grid wire frames 1311 and multiple second sub-grid wire frames 1312 in each first grid line group 130 are arranged at intervals along the first direction; and / or the two third sub-grid wire frames 1511 and multiple fourth sub-grid wire frames 1512 in each second grid line group 150 are arranged at intervals along the first direction, which enables the first welding strip and the second welding strip to extend along the first direction, thereby shortening the length of the first welding strip and the second welding strip, and further improving the current transmission effect of the first welding strip and the second welding strip.

[0063] Of course, in other embodiments, the two first sub-gate line frames 1311 and the multiple second sub-gate line frames 1312 in each first gate line group 130 may be arranged at intervals along a direction forming an angle with the first direction; and / or the two third sub-gate line frames 1511 and the multiple fourth sub-gate line frames 1512 in each second gate line group 150 may be arranged at intervals along a direction forming an angle with the first direction.

[0064] In some possible embodiments, see Figure 4 and Figure 5 The second sub-grid wire frame 1312 connects two adjacent first sub-grids 120 , and / or the fourth sub-grid wire frame 1512 connects two adjacent second sub-grids 140 .

[0065] Since the second sub-grid frame 1312 connects two adjacent first sub-grids 120, compared with when the second sub-grid frame 1312 is connected to only one first sub-grid 120, the conductivity between adjacent first sub-grids 120 can be improved. However, compared with when the second sub-grid frame 1312 is connected to at least three adjacent first sub-grids 120, it is possible to avoid excessively increasing the coverage area of ​​the second sub-grid frame 1312 on the first surface 111. Similarly, when the fourth sub-grid frame 1512 connects two adjacent second sub-grids 140, it is also possible to avoid excessively increasing the coverage area of ​​the fourth sub-grid frame 1512 on the second surface 112, thereby improving the photoelectric conversion rate of the solar cell 100.

[0066] In some possible embodiments, see Figure 4 and Figure 5 The first sub-grid frame 1311 connects at least three first sub-grids 120 close to the first side 113 or the second side 114 , and / or the third sub-grid frame 1511 connects at least three second sub-grids 140 close to the first side 113 or the second side 114 .

[0067] Since the strength of the battery cell 110 near the first side 113 and the second side 114 is relatively weak, when the first welding strip is welded to the first sub-grid frame 1311, in order to ensure the welding strength of the first side 113 and the second side 114, the first sub-grid frame 1311 is connected to at least three first sub-grids 120 near the first side 113 or the second side 114, and / or the third sub-grid frame 1511 is connected to at least three second sub-grids 140 near the first side 113 or the second side 114.

[0068] In some possible embodiments, see Figure 6 and Figure 7 The first sub-grid line frames 1311 in each two adjacent first grid line groups 130 have different lengths in the first direction, and the first sub-grid line frame 1311 is connected to the second sub-grid line frame 1312 close to the first side 113 or the second side 114, and / or, the third sub-grid line frames 1511 in each two adjacent second grid line groups 150 have different lengths in the first direction, and the third sub-grid line frame 1511 is connected to the fourth sub-grid line frame 1512 close to the first side 113 or the second side 114.

[0069] Among them, the lengths of the first sub-gridline frames 1311 in the first direction of each two adjacent first gridline groups 130 are different. It can be understood that the length of the first sub-gridline frames 1311 in one group of first gridline groups 130 is longer in the first direction, while the length of the first sub-gridline frames 1311 in the first direction of an adjacent group of first gridline groups 130 is shorter. The understanding that the lengths of the third sub-gridline frames 1511 in the first direction of each two adjacent second gridline groups 150 are different is the same as above, and will not be repeated here.

[0070] Since the lengths of the first sub-grid wire frames 1311 in each two adjacent groups of first grid wire groups 130 in the first direction are different, the first sub-grid wire frames 1311 are connected to the second sub-grid wire frames 1312 close to the first side 113 or the second side 114. Therefore, under the premise of ensuring the conductive performance of the multiple first auxiliary grids 120 close to the first side 113 or the second side 114, the second sub-grid wire frames 1312 in the two adjacent groups of first grid wire groups 130 are staggered, thereby further reducing the risk of rupture of the battery cell 110.

[0071] The lengths of the third sub-gridline frames 1511 in each two adjacent second gridline groups 150 in the first direction are different. The effect of connecting the third sub-gridline frame 1511 with the fourth sub-gridline frame 1512 close to the first side 113 or the second side 114 is the same as above and will not be repeated here.

[0072] In some possible embodiments, see Figure 8The second sub-grid frame 1312 and the fourth sub-grid frame 1512 are both square frame structures, and the width of the frame edges of the second sub-grid frame 1312 and the fourth sub-grid frame 1512 parallel to the second direction is greater than the width of the frame edges parallel to the first direction.

[0073] Since the width of the frame edges of the second sub-grid frame 1312 and the fourth sub-grid frame 1512 parallel to the second direction is greater than the width of the frame edges parallel to the first direction, when the first welding strip is welded to the frame edge of the second sub-grid frame 1312 parallel to the second direction, the conductive effect between the second sub-grid frame 1312 and the first welding strip can be improved. Similarly, when the second welding strip is welded to the frame edge of the fourth sub-grid frame 1512 parallel to the second direction, the conductive effect between the fourth sub-grid frame 1512 and the second welding strip can be improved.

[0074] In some possible embodiments, see Figure 8 A widened portion 1313 is printed on the welding position of the second sub-grid frame 1312 and the fourth sub-grid frame 1512 and the frame edges parallel to the second direction.

[0075] By printing the widened portion 1313 on the welding position of the frame edges of the second sub-grid frame 1312 and the fourth sub-grid frame 1512 parallel to the second direction, on the one hand, the welding effect between the frame edges of the second sub-grid frame 1312 parallel to the second direction and the first welding strip can be improved, and the welding effect between the frame edges of the fourth sub-grid frame 1512 parallel to the second direction and the second welding strip can be improved. On the other hand, the conductive effect of the frame edges of the second sub-grid frame 1312 and the fourth sub-grid frame 1512 parallel to the second direction is improved.

[0076] In some possible embodiments, see Fig. 9 , the welding position of the first sub-grid 120 between each adjacent two second sub-grid frames 1312 in each group of first grid line groups 130 is provided with a first widening section 121; and / or, the welding position of the second sub-grid 140 between each adjacent two fourth sub-grid frames 1512 in each group of second grid line groups 150 is provided with a second widening section 141.

[0077] Therefore, by setting the first widening section 121 at the welding position of the first auxiliary grid 120, the welding effect between the first welding strip and the first auxiliary grid 120 can be improved when welding the first welding strip, and the conductive effect between the first auxiliary grid 120 and the first welding strip can be improved. Similarly, by setting the second widening section 141 at the welding position of the second auxiliary grid 140, the welding effect between the second welding strip and the second auxiliary grid 140 can be improved when welding the second welding strip, and the conductive effect between the second auxiliary grid 140 and the second welding strip can be improved.

[0078] In some possible embodiments, in the first direction, two ends of the first widening section 121 are respectively flush with the frame edges of the second sub-grid frame 1312 or located within the two ends of the frame edges of the second sub-grid frame 1312; and / or, in the first direction, two ends of the second widening section 141 are respectively flush with the frame edges of the fourth sub-grid frame 1512 or located within the two ends of the frame edges of the fourth sub-grid frame 1512.

[0079] Therefore, by making the two ends of the first widened section 121 flush with the frame edges of the second sub-grid frame 1312 in the first direction or located within the two ends of the frame edges of the second sub-grid frame 1312, it is possible to reduce the waste of silver paste while ensuring the welding effect between the first auxiliary grid 120 and the first welding strip, and at the same time reduce the shielding area of ​​the first widened section 121 on the first surface 111. Similarly, by making the two ends of the second widened section 141 flush with the frame edges of the fourth sub-grid frame 1512 in the first direction or located within the two ends of the frame edges of the fourth sub-grid frame 1512, it is possible to reduce the waste of silver paste while ensuring the welding effect between the second auxiliary grid 140 and the second welding strip, and at the same time reduce the shielding area of ​​the second widened section 141 on the second surface 112.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A solar cell, characterized in that: include: A battery cell (110), wherein the battery cell (110) has a first surface (111) and a second surface (112) that are opposite to each other; A plurality of first auxiliary grids (120), wherein the plurality of first auxiliary grids (120) are printed on the first surface (111) at intervals along a first direction and extend along a second direction, wherein the second direction is perpendicular to the first direction and parallel to the first surface (111); A plurality of first grid line groups (130), wherein the plurality of first grid line groups (130) are printed on the first surface (111) at intervals along the second direction, wherein the first grid line groups (130) include a plurality of first grid line frames (131), and each of the first grid line frames (131) connects at least two adjacent first sub-grids (120); A plurality of second auxiliary grids (140), wherein the plurality of second auxiliary grids (140) are printed on the second surface (112) at intervals along the first direction and extend along the second direction; A plurality of second grid line groups (150) are provided, wherein the plurality of second grid line groups (150) are printed on the second surface (112) at intervals along the second direction, wherein the second grid line groups (150) include a plurality of second grid line frames (151), wherein each second grid line frame (151) is connected to at least two adjacent second sub-grids (140), and in the thickness direction of the battery cell (110), the projection of at least part of the second grid line frames (151) on the first surface (111) is offset from the first grid line frame (131).

2. The solar cell according to claim 1, characterized in that: The battery sheet (110) has a first side edge (113) and a second side edge (114) opposite to each other in the first direction; The plurality of first gate wire frames (131) include two first sub-gate wire frames (1311) and a plurality of second sub-gate wire frames (1312), the two first sub-gate wire frames (1311) are respectively arranged close to the first side edge (113) and the second side edge (114), and the plurality of second sub-gate wire frames (1312) are arranged between the two first sub-gate wire frames (1311); The second grid wire frame (151) includes two third sub-grid wire frames (1511) and a plurality of fourth sub-grid wire frames (1512), the two third sub-grid wire frames (1511) being respectively arranged close to the first side edge (113) and the second side edge (114), the plurality of fourth sub-grid wire frames (1512) being arranged between the two third sub-grid wire frames (1511), and in the thickness direction of the battery cell (110), the projection of the fourth sub-grid wire frame (1512) on the first surface (111) is staggered from the second sub-grid wire frame (1312).

3. The solar cell according to claim 2, characterized in that: The two first sub-gridline frames (1311) and the plurality of the second sub-gridline frames (1312) in each group of the first gridline groups (130) are arranged at intervals along the first direction; and / or, The two third sub-gridline frames (1511) and the plurality of fourth sub-gridline frames (1512) in each group of the second gridline groups (150) are arranged at intervals along the first direction.

4. The solar cell according to claim 2, characterized in that: The second sub-grid wire frame (1312) connects two adjacent first sub-grids (120), and / or the fourth sub-grid wire frame (1512) connects two adjacent second sub-grids (140).

5. The solar cell according to claim 2, characterized in that: The first sub-grid frame (1311) is connected to at least three of the first sub-grids (120) near the first side (113) or the second side (114), and / or the third sub-grid frame (1511) is connected to at least three of the second sub-grids (140) near the first side (113) or the second side (114).

6. The solar cell according to claim 5, characterized in that: The first sub-grid line frames (1311) in each two adjacent groups of the first grid line groups (130) have different lengths in the first direction, and the first sub-grid line frames (1311) are connected to the second sub-grid line frames (1312) close to the first side (113) or the second side (114), and / or the third sub-grid line frames (1511) in each two adjacent groups of the second grid line groups (150) have different lengths in the first direction, and the third sub-grid line frames (1511) are connected to the fourth sub-grid line frames (1512) close to the first side (113) or the second side (114).

7. The solar cell according to claim 2, characterized in that: The second sub-grid frame (1312) and the fourth sub-grid frame (1512) are both square frame structures, and the widths of the frame edges of the second sub-grid frame (1312) and the fourth sub-grid frame (1512) parallel to the second direction are greater than the widths of the frame edges parallel to the first direction.

8. The solar cell according to claim 7, characterized in that: A widened portion (1313) is printed on the welding position of the second sub-grid frame (1312) and the fourth sub-grid frame (1512) and the frame edge parallel to the second direction.

9. The solar cell according to claim 2, characterized in that: The first auxiliary grid (120) between each adjacent two second sub-grid grid frames (1312) in each group of the first grid line group (130) is provided with a first widening section (121); and / or, A second widened section is provided at the welding position of the second auxiliary grid (140) between each adjacent two fourth sub-grid frames (1512) in each group of the second grid line group (150).

10. The solar cell according to claim 9, characterized in that: In the first direction, two ends of the first widened section (121) are respectively flush with the frame edge of the second sub-grid frame (1312) or located within the two ends of the frame edge of the second sub-grid frame (1312); and / or, In the first direction, two ends of the second widened section are respectively flush with the frame edge of the fourth sub-grid frame (1512) or located within two ends of the frame edge of the fourth sub-grid frame (1512).

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