Photovoltaic cell piece, photovoltaic cell string and photovoltaic module

Abstract

The invention discloses a photovoltaic cell piece, a photovoltaic cell string and a photovoltaic module, the photovoltaic cell piece comprises a cell piece body, a plurality of solder strips and at least one bus bar, the surface of one side of the cell piece body in a first direction is provided with a plurality of grid lines, the plurality of grid lines are spaced along a second direction, and each grid line extends along a third direction; the plurality of welding strips are in one-to-one correspondence with the plurality of grid lines, the plurality of welding strips are spaced along a second direction, each welding strip extends along a third direction, and each welding strip is arranged on one side, far away from the cell body, of the corresponding grid line; and the bus bar is arranged at one side, far away from the battery piece body, of the plurality of welding strips and is electrically connected with the plurality of welding strips. Compared with a traditional solar cell piece, the photovoltaic cell piece has the advantages that a main grid and a part of auxiliary grids are saved, the current transmission path is shortened, and the electrical loss is reduced, so that the photoelectric conversion efficiency of the photovoltaic cell piece is improved, the weight and the cost of the photovoltaic cell piece are reduced, and the lightweight design of the photovoltaic cell piece is facilitated.

Description

Technical Field

[0001] This invention relates to the field of solar cell technology, and in particular to a photovoltaic cell, a photovoltaic cell string, and a photovoltaic module. Background Technology

[0002] In related technologies, solar cells have a main grid and a sub-grid, with solder ribbons welded to the main grid. The current collection path is sub-grid-main grid-solder ribbon, resulting in a long current transmission path and significant electrical losses during current transmission, thus affecting photoelectric conversion efficiency. Furthermore, the presence of the main grid and the relatively heavy paste used to process it increase the weight of the solar cell and its cost. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of this invention is to provide a photovoltaic cell that reduces electrical losses, improves the photoelectric conversion efficiency of the photovoltaic cell, and reduces the weight and cost of the photovoltaic cell, thus facilitating lightweight design of the photovoltaic cell.

[0004] Another object of the present invention is to provide a photovoltaic cell string comprising the above-mentioned photovoltaic cells.

[0005] Another object of the present invention is to provide a photovoltaic module comprising the above-mentioned photovoltaic cell string.

[0006] A photovoltaic cell according to a first aspect of the present invention includes: a cell body, wherein a plurality of grid lines are provided on one side surface in a first direction, the plurality of grid lines are spaced apart along a second direction, and each grid line extends along a third direction, wherein the first direction, the second direction, and the third direction are orthogonal to each other; a plurality of solder strips, wherein each solder strip corresponds one-to-one with the plurality of grid lines, the plurality of solder strips are spaced apart along the second direction, each solder strip extends along the third direction, and each solder strip is disposed on the side of the corresponding grid line away from the cell body; and at least one busbar, the busbar being disposed on the side of the plurality of solder strips away from the cell body, and the busbar being electrically connected to the plurality of solder strips.

[0007] According to embodiments of the present invention, a photovoltaic cell is constructed by distributing multiple grid lines and multiple solder ribbons on one side surface of the cell body in a first direction, with the solder ribbons parallel to the grid lines, and the busbar electrically connected to the multiple solder ribbons. Therefore, compared to conventional solar cells, this design saves on the main grid and part of the sub-grid, shortens the current transmission path, reduces electrical losses, thereby improving the photoelectric conversion efficiency of the photovoltaic cell, and reducing its weight and cost, facilitating lightweight design of the photovoltaic cell.

[0008] According to some embodiments of the present invention, the plurality of gate lines include a plurality of positive gate lines and a plurality of negative gate lines, and the plurality of positive gate lines and the plurality of negative gate lines are arranged alternately along the second direction; there are a plurality of bus bars, the plurality of bus bars include positive bus bars and negative bus bars, the positive bus bars are electrically connected to the plurality of positive gate lines, and the negative bus bars are electrically connected to the plurality of negative gate lines.

[0009] According to some embodiments of the present invention, the positive electrode busbar and the negative electrode busbar are respectively located on both sides of the battery cell body in the third direction.

[0010] According to some embodiments of the present invention, each of the positive grid lines is connected to a first insulating member at one end in the third direction, and each of the positive grid lines is connected to a first soldering flux at the other end in the third direction, and the positive busbar is electrically connected to the first soldering flux; each of the negative grid lines is connected to a second insulating member at one end in the third direction, and each of the negative grid lines is connected to a second soldering flux at the other end in the third direction, and the negative busbar is electrically connected to the second soldering flux.

[0011] According to some embodiments of the present invention, the width of the first insulating member in the third direction is greater than or equal to the width of the positive busbar; and / or the width of the second insulating member in the third direction is greater than or equal to the width of the negative busbar.

[0012] According to some embodiments of the present invention, the number of grid lines is N, and the width of the battery cell body in the second direction is W, wherein N and W satisfy: 0.5≤W / N≤2.

[0013] According to some embodiments of the present invention, the length of the solder strip in the third direction is greater than or equal to the length of the gate line; and / or the width of the solder strip in the second direction is greater than or equal to the width of the gate line.

[0014] A photovoltaic cell string according to a second aspect of the present invention includes: a plurality of photovoltaic cells arranged along a third direction, wherein the photovoltaic cells are photovoltaic cells according to the first aspect of the present invention described above; and at least one conductive connector, wherein both ends of the conductive connector are electrically connected to two busbars of two adjacent photovoltaic cells respectively.

[0015] According to some embodiments of the present invention, the conductive connector includes a conductor and a reflective layer, the reflective layer being disposed on the side of the conductor adjacent to the photovoltaic cell, and the reflective layer being opposite to the gap between two adjacent photovoltaic cells.

[0016] According to some embodiments of the present invention, the length of the reflective layer in the third direction is greater than or equal to the minimum distance between two adjacent photovoltaic cells.

[0017] According to some embodiments of the present invention, a flux layer is provided on the side of the conductor adjacent to the photovoltaic cell, and the flux layer is electrically connected to the busbar.

[0018] A photovoltaic module according to a third aspect of the present invention includes a photovoltaic cell string according to the second aspect of the present invention described above.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of a photovoltaic cell according to an embodiment of the present invention, wherein the solder strip and busbar are not shown;

[0022] Figure 2 This is a schematic diagram of a photovoltaic cell according to an embodiment of the present invention, wherein busbars are not shown;

[0023] Figure 3 This is a schematic diagram of a photovoltaic cell according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of a photovoltaic cell string according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the conductive connector of a photovoltaic cell string according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of a conductive connector for a photovoltaic cell string according to another embodiment of the present invention.

[0027] Figure label:

[0028] 100: Photovoltaic cells;

[0029] 110: Cell body; 120: Grid line; 121: Positive grid line; 122: Negative grid line; 130: Solder ribbon; 140: Busbar; 141: Positive busbar; 142: Negative busbar; 150: First insulating component; 160: First soldering flux; 170: Second insulating component; 180: Second soldering flux;

[0030] 200: Photovoltaic cell string; 210: Conductive connector; 211: Conductor; 212: Reflective layer; 213: Solder flux layer. Detailed Implementation

[0031] The following is for reference. Figures 1-3 A photovoltaic cell 100 according to an embodiment of the first aspect of the present invention is described.

[0032] like Figures 1-3 As shown, a photovoltaic cell according to a first aspect embodiment of the present invention includes: a cell body 110, a plurality of solder strips 130 and at least one busbar 140, wherein "a plurality of" in the description of the present invention means two or more.

[0033] Specifically, the battery cell body 110 has a plurality of grid lines 120 on one side surface in the first direction, and the plurality of grid lines 120 are along the second direction (e.g., Figure 1 The grid lines are spaced apart in the left and right directions, and each grid line 120 is along a third direction (e.g., Figure 1 The grid extends vertically (in the vertical direction), and the first, second, and third directions are orthogonal to each other. Multiple solder strips 130 correspond one-to-one with multiple grid lines 120. The solder strips 130 are spaced apart along the second direction, and each solder strip 130 extends along the third direction, located on the side of the corresponding grid line 120 away from the cell body 110. A busbar 140 is located on the side of the multiple solder strips 130 away from the cell body 110, and the busbar 140 is electrically connected to the multiple solder strips 130.

[0034] It should be noted that this application uses photovoltaic cell 100 as an example of a half-cell, but it is not limited to this. The first direction can be the thickness direction of the half-cell, the second direction can be the length direction of the half-cell, and the third direction can be the width direction of the half-cell.

[0035] For example, in Figures 1-3In this example, the front side of the cell body 110 has no grid lines 120. Multiple grid lines 120 are disposed on the back side of the cell body 110, evenly spaced along the length of the cell body 110, and each grid line 120 extends along the width of the cell body 110. In the thickness direction of the cell body 110, solder ribbons 130 are opposite to the grid lines 120, i.e., parallel to the grid lines 120, and connected to the side of the grid lines 120 away from the cell body 110. A busbar 140 is also disposed on the back side of the cell body 110 and connected to the multiple solder ribbons 130. When light shines on the cell body 110, the cell body 110 generates current through photovoltaics. This current can be transmitted through the grid lines 120 to the solder ribbons 130, then collected by the multiple solder ribbons 130 to the busbar 140, and finally discharged through the busbar 140. Therefore, while ensuring that the current generated by the cell body 110 can be discharged, the main grid and the sub-grid on the front side of the cell body 110 are saved, thereby shortening the current transmission path, improving the photoelectric conversion efficiency of the photovoltaic cell 100, and reducing the weight and cost of the photovoltaic cell 100, which is conducive to the lightweight design of the photovoltaic cell 100.

[0036] The number of grid lines 120 and solder strips 130 can both be 32, but is not limited to this.

[0037] According to an embodiment of the present invention, the photovoltaic cell 100 has multiple grid lines 120 and multiple solder ribbons 130 disposed on one side surface of the cell body 110 in a first direction, with the solder ribbons 130 parallel to the grid lines 120, and the busbar 140 electrically connected to the multiple solder ribbons 130. Therefore, compared with conventional solar cells, it saves the main grid and part of the sub-grid, shortens the current transmission path, reduces electrical losses, thereby improving the photoelectric conversion efficiency of the photovoltaic cell 100, and reducing the weight and cost of the photovoltaic cell 100, which is beneficial for the lightweight design of the photovoltaic cell 100.

[0038] According to some embodiments of the present invention, with reference to Figure 3 The plurality of grid lines 120 include a plurality of positive grid lines 121 and a plurality of negative grid lines 122, which are arranged alternately along a second direction. There are multiple busbars 140, each including a positive busbar 141 and a negative busbar 142. The positive busbar 141 is electrically connected to the plurality of positive grid lines 121, and the negative busbar 142 is electrically connected to the plurality of negative grid lines 122.

[0039] Thus, each negative grid line 122 is located between two adjacent positive grid lines 121, and the two outermost grid lines 120 located on the cell body 110 are the positive grid lines 121 (e.g., Figure 1(As shown); or, each positive grid line 121 is located between two adjacent negative grid lines 122, in which case the two outermost grid lines 120 of the cell body 110 are negative grid lines 122 (not shown in the figure). In actual use, the positive busbar 141 is connected to the negative terminal of the external electronic component, and the negative busbar 142 is connected to the positive terminal of the external electronic component. At this time, part of the current generated by the cell body 110 is transmitted to the external electronic component through the positive grid line 121, the solder ribbon 130 connected to the positive grid line 121, and the positive busbar 141. The current flowing through the external electronic component then flows back to the cell body 110 through the negative busbar 142, the solder ribbon 130 connected to the negative grid line 122, and the negative grid line 122. In this way, a complete current loop is formed to supply power to the external electronic component.

[0040] Furthermore, such as Figure 3 As shown, the positive electrode busbar 141 and the negative electrode busbar 142 are located on both sides of the cell body 110 in the third direction. That is, the positive electrode busbar 141 and the negative electrode busbar 142 are located on both sides of the width direction of the cell body 110. This arrangement can effectively utilize the space between the solder ribbon 130 and the edge of the cell body 110, making the structure of the photovoltaic cell 100 compact and facilitating miniaturization design.

[0041] Furthermore, each positive grid line 121 is connected to a first insulating member 150 at one end in a third direction, and to a first soldering member 160 at the other end in a third direction. The positive busbar 141 is electrically connected to the first soldering member 160. In this way, both ends of each positive grid line 121 can be spaced apart from the edge of the cell body 110. The first soldering member 160 and the first insulating member 150 can be respectively disposed between the two ends of the positive grid line 121 and the edge of the cell body 110. The first insulating member 150 and the first soldering member 160 can be formed by printing insulating material and soldering material on the back of the cell body 110. Since both the positive electrode busbar 141 and the negative electrode busbar 142 extend along the width direction of the cell body 110, and multiple positive electrode grid lines 121 are arranged at intervals along the width direction of the cell body 110, the positive electrode grid lines 121 and the negative electrode busbar 142 can be insulated and connected by the first insulating member 150, and the positive electrode busbar 141 and the positive electrode grid lines 121 can be reliably electrically connected by the first soldering aid 160.

[0042] Similarly, each negative grid line 122 is connected to a second insulating member 170 at one end in a third direction, and a second soldering member 180 is connected to the other end in a third direction. The negative busbar 142 is electrically connected to the second soldering member 180. Both ends of each negative grid line 122 can be spaced apart from the edge of the cell body 110. The second soldering member 180 and the second insulating member 170 can be respectively disposed between the two ends of the negative grid line 122 and the edge of the cell body 110. The second insulating member 170 and the second soldering member 180 can be formed by printing insulating material and soldering material on the back of the cell body 110. Since both the positive electrode busbar 141 and the negative electrode busbar 142 extend along the width direction of the cell body 110, and multiple negative electrode grid lines 122 are arranged at intervals along the width direction of the cell body 110, the negative electrode grid lines 122 can be insulated from the positive electrode busbar 141 by the second insulating member 170, and the negative electrode busbar 142 can be reliably electrically connected to the negative electrode grid lines 122 by the second soldering aid 180.

[0043] Thus, the first insulating component 150 and the second soldering component 180 are both located on the same side of the cell body 110 in a third direction, and the first soldering component 160 and the second insulating component 170 are both located on the other side of the cell body 110 in a third direction.

[0044] In some alternative embodiments, the first flux 160 may be disposed on the positive gate line 121 and adjacent to the end of the positive gate line 121; the second flux 180 may also be disposed on the negative gate line 122 and adjacent to the end of the negative gate line 122.

[0045] According to some specific embodiments of the present invention, the width of the first insulating member 150 in the third-direction direction is greater than or equal to the width of the positive busbar 141. That is, the end face of the first insulating member 150 in the third-direction direction is flush with the end face of the positive busbar 141; or, the end face of the first insulating member 150 in the third-direction direction protrudes beyond the end face of the positive busbar 141. Thus, while the first insulating member 150 separates the positive grid line 121 from the negative busbar 142, it can also separate the positive busbar 141 from the battery cell body 110, avoiding short circuits and electrical losses.

[0046] And / or, the width of the second insulating member 170 in the third direction is greater than or equal to the width of the negative busbar 142. That is, the end face of the second insulating member 170 in the third direction is flush with the end face of the negative busbar 142; or, the end face of the second insulating member 170 in the third direction protrudes beyond the end face of the negative busbar 142. Thus, while the second insulating member 170 separates the negative grid line 122 from the positive busbar 141, it can also separate the negative busbar 142 from the battery cell body 110, preventing short circuits and electrical losses.

[0047] According to some embodiments of the present invention, the number of grid lines 120 is N, and the width of the cell body 110 in the second direction is W, wherein N and W satisfy: 0.5 ≤ W / N ≤ 2. When W / N > 2, the number of grid lines 120 is small, resulting in a larger distance between two adjacent grid lines 120. This increases the path for current generated by the cell body 110 to be transmitted to the grid lines 120, causing some electrical losses and affecting the photoelectric conversion efficiency of the photovoltaic cell 100. When W / N < 0.5, the number of grid lines 120 is large. Although the photoelectric conversion efficiency of the photovoltaic cell 100 can be guaranteed, it will also increase the weight and cost of the photovoltaic cell 100. Therefore, by controlling the ratio of the number of grid lines 120 to the width of the cell body 110 to be between 0.5 ≤ W / N ≤ 2, the photoelectric conversion efficiency of the photovoltaic cell 100 can be guaranteed, while the weight and cost of the photovoltaic cell 100 can be reduced.

[0048] According to some embodiments of the present invention, such as Figure 2 and Figure 3 As shown, the length of the solder strip 130 in the third direction is greater than or equal to the length of the grid line 120; and / or the width of the solder strip 130 in the second direction is greater than or equal to the width of the grid line 120. This configuration ensures that the solder strip 130 can block the grid line 120 on the projection plane in the first direction, meaning the cross-sectional area of ​​the solder strip 130 is greater than or equal to the cross-sectional area of ​​the grid line 120, so that as much current as possible can be transferred from the grid line 120 to the solder strip 130. It should be noted that, to ensure the photoelectric conversion efficiency of the photovoltaic cell 100, it is optimal for the cross-sectional area of ​​the solder strip 130 to be slightly larger than the cross-sectional area of ​​the grid line 120.

[0049] like Figure 4 As shown, a photovoltaic cell string 200 according to a second aspect embodiment of the present invention includes: a plurality of photovoltaic cells 100 and at least one conductive connector 210.

[0050] Specifically, multiple photovoltaic cells 100 are arranged along a third direction. The photovoltaic cells 100 are the photovoltaic cells 100 of the first aspect embodiment of the present invention. The two ends of the conductive connector 210 are electrically connected to the two busbars 140 of two adjacent photovoltaic cells 100, respectively.

[0051] For example, in Figure 4 In the example, multiple photovoltaic cells 100 can be arranged at intervals along a third direction. The conductive connector 210 is located in the gap between two adjacent photovoltaic cells 100, and one end of the conductive connector 210 is electrically connected to the positive busbar 141 of one of the photovoltaic cells 100, and the other end of the conductive connector 210 is electrically connected to the negative busbar 142 of another photovoltaic cell 100, so as to connect multiple photovoltaic cells 100 in series to form a complete photovoltaic cell string 200.

[0052] Alternatively, two adjacent photovoltaic cells 100 may be partially stacked in the first direction, and the conductive connector 210 in the first direction may be located between the two adjacent photovoltaic cells 100 (not shown in the figure).

[0053] According to the embodiments of the present invention, by adopting the photovoltaic cell 100 described above, the output power of the photovoltaic cell string 200 can be increased while the weight and cost of the photovoltaic cell string 200 can be reduced, which is beneficial to the lightweight design of the photovoltaic cell string 200.

[0054] According to some embodiments of the present invention, such as Figure 5 and Figure 6 As shown, the conductive connector 210 includes a conductor 211 and a reflective layer 212. The reflective layer 212 is disposed on the side of the conductor 211 adjacent to the photovoltaic cell 100, and the reflective layer 212 is opposite to the gap between two adjacent photovoltaic cells 100. When incident light shines on the gap between two adjacent photovoltaic cells 100, the reflective layer 212 can reflect the incident light to achieve a reflective effect, so that as much light as possible can shine on the photovoltaic cell 100, thereby improving the output power of the photovoltaic cell string 200.

[0055] Optionally, the reflective layer 212 can be a white reflective layer (e.g., Figure 6 (as shown) or black reflective layer (such as) Figure 5 (As shown).

[0056] Furthermore, the length of the upward-facing reflective layer 212 is greater than or equal to the minimum distance between two adjacent photovoltaic cells 100. This configuration ensures the photoelectric conversion efficiency of the photovoltaic cell string 200.

[0057] In some alternative embodiments, such as Figure 5 and Figure 6 As shown, a flux layer 213 is provided on the side of the conductor 211 adjacent to the photovoltaic cell 100, and the flux layer 213 is electrically connected to the busbar 140. That is, the reflective layer 212 has flux layers 213 on both sides in the third direction, and the flux layers 213 are used to reliably connect the busbar 140 and the conductive connector 210. The surface of the reflective layer 212 away from the conductor 211 can be flush with the surface of the flux layer 213 away from the conductor 211.

[0058] A photovoltaic module (not shown) according to a third aspect embodiment of the present invention includes a photovoltaic cell string 200 according to the second aspect embodiment described above.

[0059] According to the photovoltaic module of the present invention, by adopting the above-mentioned photovoltaic cell string 200, the weight and cost of the photovoltaic module can be reduced, which is conducive to the lightweight design of the photovoltaic module.

[0060] Other configurations and operations of the photovoltaic modules according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0061] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0064] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic cell, characterized in that, include: The battery cell body has a plurality of grid lines on one side surface in a first direction, the plurality of grid lines are spaced apart along a second direction, and each grid line extends along a third direction, the first direction, the second direction and the third direction are orthogonal to each other; Multiple solder strips, each solder strip corresponding to a plurality of grid lines, the multiple solder strips being spaced apart along the second direction, each solder strip extending along the third direction, and each solder strip being disposed on the side of the corresponding grid line away from the cell body; At least one busbar is disposed on the side of the plurality of solder strips away from the cell body, and the busbar is electrically connected to the plurality of solder strips.

2. The photovoltaic cell according to claim 1, characterized in that, The plurality of gate lines include a plurality of positive gate lines and a plurality of negative gate lines, and the plurality of positive gate lines and the plurality of negative gate lines are arranged alternately along the second direction; The busbars are multiple, including positive busbars and negative busbars. The positive busbars are electrically connected to the multiple positive grid lines, and the negative busbars are electrically connected to the multiple negative grid lines.

3. The photovoltaic cell according to claim 2, characterized in that, The positive electrode busbar and the negative electrode busbar are located on opposite sides of the battery cell body in the third direction.

4. The photovoltaic cell according to claim 3, characterized in that, Each of the positive grid lines is connected to a first insulating element at one end in the third direction, and each of the positive grid lines is connected to a first soldering element at the other end in the third direction. The positive busbar is electrically connected to the first soldering element. Each of the negative electrode grid lines is connected to a second insulating member at one end in the third direction, and each of the negative electrode grid lines is connected to a second soldering member at the other end in the third direction. The negative electrode busbar is electrically connected to the second soldering member.

5. The photovoltaic cell according to claim 4, characterized in that, In the third direction, the width of the first insulating member is greater than or equal to the width of the positive busbar; and / or The width of the second insulating member in the direction of the third party is greater than or equal to the width of the negative busbar.

6. The photovoltaic cell according to any one of claims 1-5, characterized in that, The number of grid lines is N, and the width of the battery cell body in the second direction is W, wherein N and W satisfy: 0.5≤W / N≤2.

7. The photovoltaic cell according to any one of claims 1-5, characterized in that, The length of the solder strip in the direction of the third party is greater than or equal to the length of the gate line; and / or In the second direction, the width of the solder strip is greater than or equal to the width of the gate line.

8. A photovoltaic cell string, characterized in that, include: Multiple photovoltaic cells are arranged along a third direction, and the photovoltaic cells are according to any one of claims 1-7; At least one conductive connector, the two ends of which are electrically connected to two busbars of two adjacent photovoltaic cells, respectively.

9. The photovoltaic cell string according to claim 8, characterized in that, The conductive connector includes a conductor and a reflective layer. The reflective layer is disposed on the side of the conductor adjacent to the photovoltaic cell, and the reflective layer is opposite to the gap between two adjacent photovoltaic cells.

10. The photovoltaic cell string according to claim 10, characterized in that, The length of the reflective layer in the third-party direction is greater than or equal to the minimum distance between two adjacent photovoltaic cells.

11. The photovoltaic cell string according to claim 10, characterized in that, The conductor has a flux layer on the side adjacent to the photovoltaic cell, and the flux layer is electrically connected to the busbar.

12. A photovoltaic module, characterized in that, Includes the photovoltaic cell string according to any one of claims 8-11.

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