Back contact type solar cell and photovoltaic module

Abstract

The invention discloses a back contact type solar cell and a photovoltaic module, and belongs to the technical field of photovoltaic modules. The back contact type solar cell comprises a cell body, the cell body is provided with a first surface and a second surface which are oppositely arranged, and the first surface is provided with a first side edge and a second side edge which are oppositely arranged along a second direction; the first pattern area is arranged at the position, close to the first side edge, of the first surface, the first pattern area is internally provided with a plurality of first fine grids and a plurality of second fine grids which extend in the first direction and are alternately arranged at intervals in the second direction, and a suspension grid line extending in the second direction, and the suspension grid line is connected to the first fine grids; a first insulating block is arranged between the floating grid line and each second fine grid, and the floating grid line comprises a joint part and at least two connecting lines connected to the joint part; wherein the second direction intersects with the first direction.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic modules, and in particular to a back-contact solar cell and a photovoltaic module. Background Art

[0002] As a type of solar cell, a back-contact solar cell refers to a cell in which the positive and negative grid lines are both arranged on the back of the cell to avoid the positive or negative grid lines blocking the front of the cell, thereby improving the photoelectric conversion efficiency of the cell.

[0003] In the related art, the back of the battery cell is provided with positive electrode fine grids and negative electrode fine grids extending along the first direction and arranged alternately along the second direction. Along the second direction, the positive electrode fine grids and negative electrode fine grids close to the side of the battery cell are both multi-segment structures. That is to say, along the second direction, the positive electrode fine grids and negative electrode fine grids close to the side of the battery cell each include a plurality of connecting segments, and the plurality of connecting segments are arranged at intervals along the first direction, and there is a gap between two adjacent connecting segments. The positive main grid and the negative main grid extend along the second direction and are arranged alternately along the first direction. The positive main grid is electrically connected to the positive electrode fine grid and passes between two adjacent connecting segments in the negative electrode fine grid. The negative main grid is electrically connected to the negative electrode fine grid and passes between two adjacent connecting segments in the positive electrode fine grid.

[0004] However, the arrangement of the positive and negative pole grid lines in the related art results in low current collection efficiency near the side areas of the cell, and the main grid runs through the cell in the second direction, resulting in a large amount of main grid slurry and a high cost for the solar cell. Summary of the invention

[0005] The present application discloses a back-contact solar cell and photovoltaic module to solve or at least partially solve the problems existing in the prior art, that is, the current collection efficiency near the side of the cell is low, the main grid slurry consumption is large, and the cost of the solar cell is high.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In a first aspect, the present application discloses a back-contact solar cell, comprising: a cell body, the cell body having a first surface and a second surface arranged opposite to each other, the first surface having a first side edge and a second side edge arranged opposite to each other along a second direction; a first graphic area, the first graphic area being arranged at a position close to the first side edge on the first surface, the first graphic area having a plurality of first fine grids and a plurality of second fine grids extending along a first direction and arranged alternately and spaced apart along the second direction, and a suspended grid line extending along the second direction, the suspended grid line being connected to the plurality of first fine grids, and a first insulating block being respectively arranged between the suspended grid line and each of the second fine grids, the suspended grid line comprising a joint portion and at least two connecting lines connected to the joint portion; wherein the second direction intersects with the first direction.

[0008] In a second aspect, the present application further discloses a photovoltaic module, comprising at least two back-contact solar cells according to the first aspect; and an electrical connector, wherein the electrical connector extends along the second direction and is connected to the joint portion.

[0009] The present application discloses a back-contact solar cell and a photovoltaic module, wherein the back-contact solar cell comprises a cell body, wherein the cell body comprises a first surface and a second surface arranged opposite to each other, wherein the first surface comprises a first side edge and a second side edge arranged opposite to each other along a second direction; and a first graphic region, wherein the first graphic region is arranged at a position of the first surface close to the first side edge, wherein the first graphic region comprises a plurality of first fine grids and a plurality of second fine grids extending along a first direction and arranged alternately and spaced apart along the second direction, and a suspended grid line extending along the second direction, wherein the suspended grid line is connected to the plurality of first fine grids, and a first insulating block is respectively arranged between the suspended grid line and each of the second fine grids, and wherein the suspended grid line comprises a joint portion and at least two connecting lines connected to the joint portion; wherein the second direction intersects with the first direction.

[0010] In the present application, along the second direction, the first surface of the battery cell body has a first side edge and a second side edge that are relatively arranged, and the first graphic area is arranged on the first surface of the battery cell body and is located at a position of the first surface close to the first side edge. The first graphic area has a plurality of first fine grids and a plurality of second fine grids that extend along the first direction and are alternately arranged along the second direction, so as to collect the current generated by the battery cell body through the plurality of first fine grids and the plurality of second fine grids, thereby improving the current collection efficiency of the edge area of ​​the battery cell.

[0011] Furthermore, the first graphic area also has a suspended gate line extending along the second direction, the suspended gate line is connected to the plurality of first fine grids, and a first insulating block is respectively arranged between the suspended gate line and each second fine grid, so as to collect the current collected by the plurality of first fine grids through the suspended gate line, and block a second fine grid and the suspended gate line through each first insulating block, so as to avoid short circuit in the solar cell.

[0012] Furthermore, the floating grid line in the present application includes a joint portion and at least two connecting lines connected to the joint portion. It can be understood that the floating grid line is arranged in the first graphic area, and the current collected by the plurality of first fine grids is collected by the floating grid line, and the main grid is no longer required in the first graphic area, thereby reducing the amount of main grid slurry, reducing the preparation cost of solar cell sheets, and improving the market competitiveness of solar cell sheets. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The structure of the solar cell described in the embodiment of the present application is shown in FIG. Figure 1 ;

[0014] Figure 2 The structure of the solar cell described in the embodiment of the present application is shown in FIG. Figure 2 ;

[0015] Figure 3 The structure of the solar cell described in the embodiment of the present application is shown in FIG. Figure 3 ;

[0016] Figure 4 The structure of the solar cell described in the embodiment of the present application is shown in FIG. Figure 4 ;

[0017] Figure 5 The structure of the solar cell described in the embodiment of the present application is shown in FIG. Figure 5 ;

[0018] Figure 6 The structure of the solar cell described in the embodiment of the present application is shown in FIG. Figure 6 ;

[0019] Figure 7 The structure of the solar cell described in the embodiment of the present application is shown in FIG. Figure 7 ;

[0020] Figure 8 The structure of the solar cell described in the embodiment of the present application is shown in FIG. Figure 8 ;

[0021] Fig. 9 The structure of the solar cell described in the embodiment of the present application is shown in FIG. Figure 9 ;

[0022] Fig.10 A partial cross-sectional view of a solar cell according to an embodiment of the present application is shown;

[0023] Fig.11 The structure of the solar cell described in the embodiment of the present application is shown in FIG. Figure 10 .

[0024] Reference numerals:

[0025] 10: battery cell body; 11: first side;

[0026] 20: first graphic area; 21: first fine grid; 22: second fine grid; 23: suspended grid line; 231: joint; 2311: joint body; 2312: first connection part; 2313: second connection part; 232: connection line; 2321: connection line body; 2322: protrusion; 233: main connection line; 24: first insulating block;

[0027] 30: second graphic area; 31: third fine grid; 32: fourth fine grid; 33: main grid; 34: second insulating block;

[0028] X: first direction; Y: second direction. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0030] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0031] The “floating gate line” in the embodiment of the present application refers to a gate line structure in which the gate line is at least partially stacked on an insulating block.

[0032] Reference Figure 1 , showing the structure of the solar cell described in the embodiment of the present application Figure 1 ;reference Figure 2 , showing the structure of the solar cell described in the embodiment of the present application Figure 2 ;reference Figure 3, showing the structure of the solar cell described in the embodiment of the present application Figure 3 ;reference Figure 4 , showing the structure of the solar cell described in the embodiment of the present application Figure 4 ;reference Figure 5 , showing the structure of the solar cell described in the embodiment of the present application Figure 5 ;reference Figure 6 , showing the structure of the solar cell described in the embodiment of the present application Figure 6 ;reference Figure 7 , showing the structure of the solar cell described in the embodiment of the present application Figure 7 ;reference Figure 8 , showing the structure of the solar cell described in the embodiment of the present application Figure 8 ;reference Fig. 9 , showing the structure of the solar cell described in the embodiment of the present application Figure 9 ;reference Fig.10 , shows a partial cross-sectional view of the solar cell described in the embodiment of the present application.

[0033] like Figures 1 to 10 As shown, the embodiment of the present application discloses a back-contact solar cell, which includes a cell body 10, the cell body 10 has a first surface and a second surface arranged opposite to each other, the first surface has a first side 11 and a second side arranged opposite to each other along a second direction Y; a first graphic area 20, the first graphic area 20 is arranged at a position of the first surface close to the first side 11, the first graphic area 20 has a plurality of first fine grids 21 and a plurality of second fine grids 22 extending along the first direction X and alternately arranged along the second direction Y, and a floating grid line 23 extending along the second direction Y, the floating grid line 23 is connected to the plurality of first fine grids 21, and a first insulating block 24 is respectively arranged between the floating grid line 23 and each second fine grid 22, the floating grid line 23 includes a joint portion 231 and at least two connecting lines 232 connected to the joint portion 231; wherein the second direction Y intersects with the first direction X.

[0034] like Figures 1 to 10 As shown, an embodiment of the present application discloses a back-contact solar cell. A back-contact solar cell refers to a cell in which the positive and negative grid lines are both arranged on the back of the cell to avoid the positive and negative grid lines blocking the front of the cell, thereby improving the photoelectric conversion efficiency of the cell.

[0035] The back-contact solar cell in the embodiment of the present application includes a cell body 10, which is the core component of the solar cell and can convert solar energy into electrical energy. The cell body 10 has a first surface and a second surface arranged opposite to each other. The first surface is the back side facing away from the sunlight, also known as the backlight side. The second surface is the front side facing the sunlight, also known as the light-receiving side.

[0036] like Figures 1 to 9 As shown, along the second direction Y, the first surface has a first side 11 and a second side that are arranged opposite to each other. The first graphic area 20 is arranged at a position of the first surface close to the first side 11. The first graphic area 20 has a plurality of first fine grids 21 and a plurality of second fine grids 22 extending along the first direction X, and the plurality of first fine grids 21 and the plurality of second fine grids 22 are alternately arranged along the second direction Y. The plurality of first fine grids 21 and the plurality of second fine grids 22 can collect the current generated by the battery cell body 10, thereby improving the current collection efficiency of the battery cell body 10 close to the first side 11 or the second side area.

[0037] It should be noted that the first graphic area 20 may include only one, and the first graphic area 20 is arranged at a position of the first surface close to the first side 11. The first graphic area 20 may also include two, one first graphic area 20 is arranged at a position of the first surface close to the first side 11, and the other first graphic area 20 is arranged at a position of the first surface close to the second side. Figures 1 to 9 As shown, the first fine grid 21 and the second fine grid 22 in the first graphic area 20 each include a plurality of first fine grids 21 and a plurality of second fine grids 22 which are alternately arranged along the second direction Y, so as to collect the current generated by the battery cell body 10 near the first side edge 11 through the plurality of first fine grids 21 and the plurality of second fine grids 22, thereby improving the collection efficiency of the solar cell.

[0038] like Figures 1 to 9 As shown, in the first graphic area 20 of the present embodiment, a floating gate line 23 extending along the second direction Y is also provided. Fig.10 As shown, the floating gate line 23 is arranged on the side of the first fine grid 21 and the second fine grid 22 away from the solar cell body 10, and the floating gate line 23 is electrically connected to multiple first fine grids 21 to collect the current collected by the multiple first fine grids 21. A first insulating block 24 is respectively arranged between the floating gate line 23 and each second fine grid 22, so that each first insulating block 24 blocks a second fine grid 22 and the floating gate line 23 to avoid a short circuit in the solar cell.

[0039] It should be noted that if Figures 1 to 9As shown, the first graphic area 20 in the embodiment of the present application refers to the area occupied by the first fine grid 21, the second fine grid 22 and the floating grid line 23 on the first surface of the battery cell body 10. The first fine grid 21 extends from one side of the first graphic area 20 to the other side along the first direction X. The second fine grid 22 extends from one side of the first graphic area 20 to the other side along the first direction X.

[0040] like Figures 1 to 9 As shown, the floating grid line 23 in the embodiment of the present application includes a joint portion 231 and at least two connection lines 232 connected to the joint portion 231. It can be understood that the floating grid line 23 is arranged in the first graphic area 20, and the current collected by the plurality of first fine grids 21 is collected by the floating grid line 23. There is no need to arrange a main grid in the first graphic area 20, thereby reducing the amount of main grid slurry, reducing the preparation cost of solar cell sheets, and improving the market competitiveness of solar cell sheets.

[0041] In the embodiment of the present application, along the second direction Y, the first surface of the battery cell body 10 has a first side 11 and a second side that are arranged opposite to each other, the first graphic area 20 is arranged on the first surface of the battery cell body 10, and is located at a position of the first surface close to the first side 11, and the first graphic area 20 has a plurality of first fine grids 21 and a plurality of second fine grids 22 extending along the first direction X and alternately arranged along the second direction Y, so that the current generated by the battery cell body 10 is collected by the plurality of first fine grids 21 and the plurality of second fine grids 22, thereby improving the current collection efficiency in the edge area of ​​the battery cell.

[0042] Furthermore, the first graphic area 20 also has a floating gate line 23 extending along the second direction Y, the floating gate line 23 is connected to the plurality of first fine grids 21, and a first insulating block 24 is respectively arranged between the floating gate line 23 and each second fine grid 22, so as to collect the current collected by the plurality of first fine grids 21 through the floating gate line 23, and each first insulating block 24 is used to block a second fine grid 22 and the floating gate line 23, so as to avoid a short circuit in the solar cell.

[0043] Further, the floating grid line 23 in the present application includes a joint portion 231 and at least two connection lines 232 connected to the joint portion 231. It can be understood that the floating grid line 23 is arranged in the first graphic area 20, and the current collected by the plurality of first fine grids 21 is collected by the floating grid line 23, and the main grid is no longer required in the first graphic area 20, thereby reducing the amount of main grid slurry, reducing the preparation cost of solar cell sheets, and improving the market competitiveness of solar cell sheets.

[0044] Optionally, the floating gate line 23 can be formed by printing, laser transfer, printing and the like, and its main material is a base metal material, such as copper, aluminum and the like.

[0045] Furthermore, in the photovoltaic module, the electrical connector is disposed in the gap between at least two connection wires 232, located above the joint 231, and electrically connected to the joint 231. In the process of welding the electrical connector to the cell body 10, it can be ensured that at least one connection wire 232 is not welded off, and the connection wire 232 that is not welded off can still collect the current generated in the area of ​​the cell body 10 close to the first side 11, and transmit the collected current to the joint 231, and then conduct it to the electrical connector through the joint 231, thereby further improving the current collection efficiency of the solar cell.

[0046] Alternatively, if Figures 1 to 9 As shown, along the second direction Y, at least two connection lines 232 are located close to the first side edge 11 or the second side edge, and the joining portion 231 is located relatively far away from the first side edge 11 or the second side edge.

[0047] In a back-contact photovoltaic module, one end of the electrical connector is welded to the back of a cell, and the other end of the electrical connector is welded to the back of another adjacent cell, so that the adjacent cells are connected in series through the electrical connector to form a battery string. During the transportation of the battery string, the portion of the electrical connector between two adjacent cells, or the portion of the electrical connector close to the space between two adjacent cells, is prone to displacement, resulting in a loose connection between the electrical connector and the cell.

[0048] In the present application embodiment, Figures 1 to 9 As shown, along the second direction Y, at least two connecting wires 232 are located near the first side edge 11 or the second side edge, and the joint portion 231 is located relatively far away from the first side edge 11 or the second side edge. This ensures the reliability of the connection between the electrical connector and the joint portion 231, so that the current collected by the at least two connecting wires 232 can be transmitted to the joint portion 231, and then conducted to the electrical connector through the joint portion 231, thereby further improving the collection efficiency of the solar cell.

[0049] Alternatively, if Figures 1 to 9 As shown, in the embodiment of the present application, the first insulating block 24 disposed between at least two connecting lines 232 and the same second fine gate 22 is continuous.

[0050] like Figures 1 to 9 As shown, in the embodiment of the present application, only one first insulating block 24 is provided between at least two connecting lines 232 and the same second fine grid 22, and the first insulating block 24 is continuous. The same second fine grid 22 and at least two connecting lines 232 are blocked by the first insulating block 24, so as to avoid the second fine grid 22 and at least two connecting lines 232 being electrically connected, thereby preventing the solar cell from having a short circuit problem.

[0051] Moreover, only one first insulating block 24 is disposed between at least two connecting lines 232 and the same second fine grid 22, and the first insulating block 24 is continuous, which helps to simplify the manufacturing process of the first insulating block 24 and improve the manufacturing efficiency of the solar cell.

[0052] If a first insulating block 24 is disposed between each of the at least two connecting wires 232 and the same second fine grid 22, the width of the first insulating block 24 is small along the first direction X. The connecting wire 232 is easily offset, leaks out of the corresponding first insulating block 24, and is connected to the second fine grid 22, resulting in a short circuit in the solar cell.

[0053] Alternatively, if Figures 1 to 9 As shown, along the first direction X, the maximum width between two connecting lines 232 located on both sides is smaller than the maximum width of the plurality of first insulating blocks 24 .

[0054] like Figures 1 to 9 As shown, in the embodiment of the present application, along the first direction X, the maximum width between the two connecting lines 232 located on both sides is set to be smaller than the maximum width of the plurality of first insulating blocks 24, so as to prevent the connecting line 232 from leaking out of the first insulating block 24 and connecting to the second fine grid 22, thereby causing a local short circuit in the solar cell and affecting the photoelectric conversion efficiency of the solar cell.

[0055] For example, Figure 1 As shown, the connection lines 232 include two, and along the first direction X, the maximum distance between the two connection lines 232 is less than the maximum width of the plurality of first insulating blocks 24. Figure 2 As shown, the connection lines 232 include three lines. Along the first direction X, the maximum distance between the connection lines 232 near the two sides is smaller than the maximum width of the plurality of first insulating blocks 24 .

[0056] For example, along the first direction X, the width of the first insulating block 24 is 3 mm, and the maximum width between two connecting lines 232 on both sides may be 2.9 mm, 2.8 mm, 2.7 mm, 2.6 mm, 2.5 mm, etc.

[0057] Optionally, the connection line 232 in the embodiment of the present application includes a connection line body 2321 and a protrusion 2322 protruding from the connection line body along an extension direction perpendicular to the connection line body 2321 , and the protrusion 2322 is located between adjacent first insulating blocks 24 .

[0058] The connection line 232 in the embodiment of the present application includes a connection line body 2321 and a protrusion 2322 protruding from the connection line body 2321 in a direction perpendicular to the extension direction of the connection line body 2321. The setting of the protrusion 2322 can increase the contact area between the connection line 232 and the first fine grid 21, enhance the reliability of the connection between the connection line 232 and the first fine grid 21, and thus ensure the photoelectric conversion efficiency of the solar cell. Further, the protrusion 2322 is located between adjacent first insulating blocks 24 to avoid the connection between the protrusion 2322 and the second fine grid 22, resulting in a local short circuit in the solar cell, which affects the photoelectric conversion efficiency of the solar cell.

[0059] Of course, the above are only individual examples of the specific setting positions of the protrusions 2322, and are not intended to be limitations of the present application. For example, in the present application, along the extension direction of the connecting wire body 2321, a portion of the protrusion 2322 may be provided on one side of the first fine grid 21, and another portion may be provided on the other side of the second fine grid 21. And / or, along the extension direction perpendicular to the connecting wire body 2321, the protrusions 2322 are located on both sides of the connecting wire body 2321. In the embodiments of the present application, there are no excessive restrictions on the specific setting positions of the protrusions 2322. In actual applications, technicians can set them as needed.

[0060] Optionally, in the embodiment of the present application, a position where the protrusion 2322 intersects with the first fine grid 21 has a recessed structure that is concave toward the connecting line body 2321 .

[0061] In the embodiment of the present application, a recessed structure concave toward the connecting wire body 2321 is provided at the intersection of the protrusion 2322 and the first fine grid 21, so that the connecting wire body 2321 can be directly connected to the first fine grid 21, and the current collected by the first fine grid 21 can be directly transmitted to the connecting wire body 2321, so as to improve the current transmission efficiency and ensure the photoelectric conversion efficiency of the solar cell.

[0062] like Figures 1 to 9As shown, the first graphic area 20 has a plurality of first fine grids 21 and a plurality of second fine grids 22, and the plurality of first fine grids 21 and the plurality of second fine grids 22 extend along the first direction X and are alternately arranged along the second direction Y, so as to collect the current generated by the battery cell body 10 near the first side 11 through the plurality of first fine grids 21 and the plurality of second fine grids 22. The connecting wire 232 includes a connecting wire body and a plurality of protrusions protruding from the connecting wire body along the extending direction perpendicular to the connecting wire body, and the plurality of protrusions are sequentially connected to the connecting wire body along the extending direction of the connecting wire body. Each protrusion is arranged corresponding to a first fine grid 21. And along the extending direction of the connecting wire body, the protrusion is located between two first insulating blocks 24. The reliability of the connection between the connecting wire and the corresponding first fine grid 21 is improved by each protrusion, thereby ensuring the photoelectric conversion efficiency of the solar cell.

[0063] It should be noted that, in the embodiment of the present application, the position corresponding to the protrusion and the first fine grid 21 can be narrowed. That is, along the extension direction of the connecting line body, the protrusion may include a first sub-protrusion, a second sub-protrusion, and a third sub-protrusion connected between the first sub-protrusion and the second sub-protrusion. The first sub-protrusion is located on one side of the first fine grid 21, the second sub-protrusion is located on the other side of the first fine grid 21, and the third sub-protrusion is arranged corresponding to the first fine grid 21. Along the extension direction perpendicular to the connecting line body, the width of the first sub-protrusion and the width of the second sub-protrusion are both greater than the width of the third sub-protrusion.

[0064] Optionally, the first insulating block 24 closest to the first side edge 11 has a first width, and the first insulating block 24 closest to the joining portion 231 has a second width, and the first width is greater than the second width.

[0065] like Fig. 9 As shown, in the embodiment of the present application, the first width of the first insulating block 24 closest to the first side edge 11 is set to be greater than the second width of the first insulating block 24 closest to the joint 231. In this way, along the first direction X, the width of the first insulating block 24 can be greater than the width of the two connecting wires 232 close to the edge, thereby preventing the connecting wires 232 from leaking out of the first insulating block 24 and connecting to the second fine grid 22, causing a local short circuit phenomenon in the solar cell, thereby affecting the photoelectric conversion efficiency of the solar cell.

[0066] Alternatively, if Fig. 9 As shown, along the direction from the joint portion 231 toward the first side edge 11 , the width of the first insulating block 24 along the first direction X increases gradually.

[0067] like Figures 1 to 10As shown, the first insulating block 24 in the embodiment of the present application includes a plurality of first insulating blocks 24, each of which is disposed between a second thin grid 22 and a suspended grid line 23. In other words, each first insulating block 24 is disposed between a second thin grid 22 and a joint 231 or a connecting line 232. The first insulating block 24 blocks the second thin grid 22 and the suspended grid line 23, thereby preventing the solar cell from short-circuiting.

[0068] like Fig. 9 As shown, along the direction from the joint portion 231 to the first side 11, or along the direction from the joint portion 231 to the second side, the width of the first insulating block 24 along the first direction X increases successively. In this way, along the first direction X, the width of the first insulating block 24 can be greater than the width of the two connecting wires 232 near the edge, thereby preventing the connecting wires 232 from leaking out of the first insulating block 24 and connecting to the second fine grid 22, causing a local short circuit phenomenon in the solar cell, thereby affecting the photoelectric conversion efficiency of the solar cell.

[0069] As an optional implementation, Figure 1 , Figure 3 , Figure 5 , Figure 7 and Fig. 9 As shown, the connection lines 232 in the embodiment of the present application include two, and along the second direction Y, the two connection lines 232 are arranged on the same side of the joint 231, and one end of the two connection lines 232 is sequentially connected to the joint 231 along the first direction X.

[0070] In the embodiment of the present application, along the second direction Y, two connection lines 232 are arranged on one side of the joint 231 close to the first side 11 or the second side, and the two connection lines 232 are sequentially connected to the joint 231 along the first direction X. The electrical connector extends along the second direction Y and is located in the gap between the two connection lines 232 and is connected above the joint 231. In the process of welding the electrical connector to the battery cell, even if the electrical connector is offset, the electrical connector will only overlap with one connection line 232, and this connection line 232 that overlaps with the electrical connector is at risk of being welded off, while the other connection line 232 will not be welded off. The connection line 232 that is not welded off can still collect the current generated by the battery cell body 10 close to the first side 11 or the second side area, and transmit the collected current to the joint 231, and conduct it to the electrical connector through the joint 231, thereby further improving the current collection efficiency of the solar cell.

[0071] It should be noted that, along the first direction X, the ends of the two connection lines 232 connected to the joint 231 are spaced apart. That is, there is a gap between the ends of the two connection lines 232 connected to the joint 231. Preferably, along the first direction X, the gap between the two connection lines 232 is greater than the width of the electrical connector.

[0072] As an optional implementation, Figure 1 , Figure 5 and Fig. 9 As shown, the other ends of the two connecting lines 232 in the embodiment of the present application are far away from each other; or, as Figure 3 and Figure 7 As shown, the two connection lines 232 in the embodiment of the present application are arranged in parallel along the second direction Y.

[0073] like Figure 1 , Figure 5 and Fig. 9 As shown, in the case where the connection wires 232 include two, along the second direction Y, the two connection wires 232 are arranged on the same side of the joint 231, and one end of the two connection wires 232 is sequentially connected to the joint 231 along the first direction X, and the other ends of the two connection wires 232 are away from each other. In other words, the two connection wires 232 form an acute angle with the second direction Y. This is to avoid the connection wires 232 being welded off during the process of welding the electrical connector to the solar cell, thereby affecting the current collection efficiency of the solar cell.

[0074] like Figure 3 and Figure 7 As shown, in the case where the connection wires 232 include two, the two connection wires 232 are arranged on the same side of the joint 231 along the second direction Y, the two connection wires 232 are arranged in parallel along the second direction Y, and one end of the two connection wires 232 is sequentially connected to the joint 231 along the first direction X. In the process of welding the electrical connector to the battery cell, the electrical connector can be passed through the gap between the two connection wires 232 and welded to the battery cell to prevent the connection wire 232 from being welded off and affecting the current collection efficiency of the solar cell.

[0075] As an optional implementation, Figure 2 , Figure 4 , Figure 6 and Figure 8 As shown, the connection lines 232 in the embodiment of the present application include three lines. Along the second direction Y, the three connection lines 232 are arranged on the same side of the joint portion 231, and one end of the three connection lines 232 is sequentially connected to the joint portion 231 along the first direction X.

[0076] In the embodiment of the present application, along the second direction Y, three connection lines 232 are arranged on one side of the joint 231 close to the first side 11 or the second side, and the three connection lines 232 are sequentially connected to the joint 231 along the first direction X. The electrical connector extends along the second direction Y and is located between the two connection lines 232 close to the edge, covering the joint 231 and the connection line 232 located in the middle. The connection line 232 located in the middle can collect the current collected by the first fine grid 21 and transmit it to the joint 231 or the electrical connector. The current collected by the first fine grid 21 is collected through the joint 231 or the electrical connector and transmitted to the external circuit to improve the photoelectric conversion efficiency of the solar cell.

[0077] Furthermore, during the process of welding the electrical connector to the cell, even if the electrical connector is offset to a certain extent, the electrical connector will only overlap with one of the two connection lines 232 near the edge, and the connection line 232 overlapping with the electrical connector is at risk of being welded off, while the other connection line 232 that does not overlap with the electrical connector will not be welded off. The connection line 232 that is not welded off can still collect the current generated by the cell body 10 near the first side edge 11 or the second side edge area, and transmit the collected current to the joint 231, and then conduct it to the electrical connector through the joint 231, thereby further improving the current collection efficiency of the solar cell and ensuring the photoelectric conversion efficiency of the solar cell.

[0078] It should be noted that, along the first direction X, the ends of the three connection lines 232 connected to the joint part 231 are arranged at intervals. In other words, there is a gap between the ends of the three connection lines 232 connected to the joint part 231. Preferably, along the first direction X, the gap between two connection lines 232 close to the edge is greater than the width of the electrical connector.

[0079] As an optional implementation, Figure 2 and Figure 6 As shown, along the first direction X, the connecting line 232 in the middle extends along the second direction Y, and the other ends of the connecting lines 232 on both sides are away from each other; or, as shown in FIG. Figure 4 and Figure 8 As shown, the three connection lines 232 are all arranged in parallel along the second direction Y.

[0080] like Figure 2 and Figure 6As shown, in the case where the connection wires 232 include three, along the second direction Y, the three connection wires 232 are arranged on the same side of the joint 231, and one end of the three connection wires 232 is sequentially connected to the joint 231 along the first direction X, the connection wire 232 in the middle extends along the second direction Y, and the other ends of the connection wires 232 on both sides are away from each other. In other words, the connection wire 232 in the middle extends along the second direction Y, so that the electrical connector can cover the top of the connection wire 232 in the middle, so that the current collected by the connection wire 232 in the middle can be transmitted to the external circuit through the electrical connector. The connection wires 232 on both sides form an acute angle with the second direction Y to avoid the connection wire 232 being welded off during the welding of the electrical connector to the battery cell, thereby affecting the current collection efficiency of the solar cell.

[0081] like Figure 4 and Figure 8 As shown, when there are three connecting wires 232, along the second direction Y, the three connecting wires 232 are arranged on the same side of the joint 231, the three connecting wires 232 are arranged in parallel along the second direction Y, and one end of the three connecting wires 232 is sequentially connected to the joint 231 along the first direction X. In the process of welding the electrical connector to the battery cell, the electrical connector can cover the upper part of the connecting wire 232 located in the middle, so that the current collected by the connecting wire 232 located in the middle can be transmitted to the external circuit through the electrical connector. In addition, the electrical connector can pass through the gap between the two connecting wires 232 located on both sides and be welded to the battery cell to prevent the connecting wire 232 from being welded off, which affects the current collection efficiency of the solar cell.

[0082] Optionally, along the first direction X, the width of the connection line 232 located in the middle is greater than the width of the connection lines 232 located at both sides.

[0083] In the embodiment of the present application, along the first direction X, the width of the connecting line 232 in the middle is set to be greater than the width of the connecting lines 232 on both sides, so that the width of the connecting lines 232 on both sides is narrower. In the process of processing solar cells, the amount of metal slurry can be reduced, the preparation cost of solar cells can be reduced, and the market competitiveness of solar cells can be improved.

[0084] Furthermore, the width of the connecting line 232 in the middle is relatively wide, which helps to improve the current collection efficiency and simplify the preparation process of the battery cell.

[0085] Alternatively, if Figure 3 , Figure 4 , Figure 7 and Figure 8As shown, the joining part 231 in the embodiment of the present application includes a joining part body 2311, a first connecting part 2312 and a second connecting part 2313. Along the first direction X, the first connecting part 2312 is connected to one side of the joining part body 2311, and the second connecting part 2313 is connected to the other side of the joining part body 2311; along the first direction X, one of the two connecting lines 232 located on both sides is connected to the first connecting part 2312, and the other is connected to the second connecting part 2313.

[0086] like Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, when two connection lines 232 are arranged in parallel along the second direction Y, or three connection lines 232 are arranged in parallel along the second direction Y. Along the first direction X, the first connection part 2312 is connected to one side of the joint body 2311, and the second connection part 2313 is connected to the other side of the joint body 2311, so that the length of the joint 231 along the first direction X is increased by the first connection part 2311 and the second connection part 2312.

[0087] Among them, one of the two connecting wires 232 on both sides is connected to the first connecting portion 2312, and the other is connected to the second connecting portion 2313, so that the gap between the two connecting wires 232 on both sides is large enough for the electrical connector to pass through the gap, so as to avoid the two connecting wires 232 on both sides being welded off during the process of welding the electrical connector to the solar cell, thereby affecting the current collection efficiency of the solar cell.

[0088] Alternatively, if Figures 1 to 9 As shown, the back-contact solar cell sheet disclosed in the embodiment of the present application further includes a second graphic area 30, which is arranged on the first surface and adjacent to the first graphic area 20 along the second direction Y; the second graphic area 30 has a plurality of third fine grids 31 and a plurality of fourth fine grids 32 extending along the first direction X and arranged alternately and spaced along the second direction Y, the third fine grids 31 and the first fine grids 21 having the same polarity, and the fourth fine grids 32 and the second fine grids 22 having the same polarity.

[0089] like Figures 1 to 9As shown, the first surface of the battery cell body 10 is also provided with a second graphic area 30, and along the second direction Y, the second graphic area 30 is arranged adjacent to the first graphic area 20, and the first graphic area 20 is located in the area of ​​the first surface close to the first side edge 11, and the second graphic area 30 is located in the area of ​​the first surface relatively far from the first side edge 11. The second graphic area 30 has a plurality of third fine grids 31 and a plurality of fourth fine grids 32 extending along the first direction X, and the plurality of third fine grids 31 and the plurality of fourth fine grids 32 are alternately arranged along the second direction Y. The third fine grid 31 has the same polarity as the first fine grid 21, and the fourth fine grid 32 has the same polarity as the second fine grid 22. The plurality of third fine grids 31 and the plurality of fourth fine grids 32 can collect the current generated in the middle area of ​​the battery cell body 10.

[0090] It should be noted that if Figures 1 to 9 As shown, the second graphic area 30 in the embodiment of the present application refers to the area occupied by the third fine grid 31 and the fourth fine grid 32 on the first surface of the battery cell body 10. The third fine grid 31 extends from one side of the second graphic area 30 to the other side along the first direction X. The fourth fine grid 32 extends from one side of the second graphic area 30 to the other side along the first direction X.

[0091] Alternatively, if Figures 1 to 4 As shown, the back-contact solar cell disclosed in the embodiment of the present application further includes a main grid 33, which extends along the second direction Y and is connected to the suspension grid line 23; and the main grid 33 is connected to a plurality of third fine grids 31, and a second insulating block 34 is provided between the main grid 33 and each fourth fine grid 32. The material of the main grid 33 can be the same as or different from that of the suspension grid line 23. The main grid 33 and the suspension grid line 23 can be formed integrally by the same process step.

[0092] like Figures 1 to 4 As shown, a main grid 33 is arranged in the second graphic area 30, the main grid 33 extends along the second direction Y, and the main grid 33 is connected to the joint 231 of the suspension grid line 23. The suspension grid line 23 is connected to a plurality of first fine grids 21, and the suspension grid line 23 can collect the current collected by the plurality of first fine grids 21. The main grid 33 is connected to a plurality of third fine grids 31, and the main grid 33 can collect the current collected by the plurality of third fine grids 31. Through the above arrangement, the transmission efficiency of the current is ensured, and the photoelectric conversion efficiency of the solar cell is improved.

[0093] In the embodiment of the present application, a second insulating block 34 is disposed between the main grid 33 and each fourth thin grid 32, so that each second insulating block 34 blocks the main grid 33 and the corresponding fourth thin grid 32 to prevent the solar cell from short-circuiting.

[0094] It should be noted that the second insulating block 34 in the embodiment of the present application includes a plurality of second insulating blocks 34 , and a second insulating block 34 is disposed between each fourth fine gate 32 and the main gate 33 .

[0095] Of course, if Figures 5 to 9 As shown, the main grid 33 may not be provided in the second graphic area 30. The electrical connector may be directly connected to the plurality of third fine grids 31. Alternatively, a bonding block is provided between the electrical connector and each third fine grid 31, so as to improve the reliability of the connection between the electrical connector and each third fine grid 31 through each bonding block. Exemplarily, the bonding block may be solder paste, a conductive adhesive, etc.

[0096] Alternatively, if Figures 1 to 9 As shown, along the first direction X, the width of the first insulating block 24 is greater than or equal to the width of the second insulating block 34 .

[0097] In the present application embodiment, Figures 1 to 9 As shown, along the first direction X, the width of the first insulating block 24 is set to be greater than or equal to the width of the second insulating block 34, so that the width of the first insulating block 24 is greater than the width of the two connecting lines 232 near the two sides, thereby preventing the two connecting lines 232 near the two sides from leaking out of the first insulating block 24 and connecting to the second fine grid 22, causing a local short circuit in the solar cell and affecting the photoelectric conversion efficiency of the solar cell.

[0098] Since the width of the main grid 33 along the first direction X is usually smaller than the width of the two connecting lines 232 near the two sides, the width of the second insulating block 34 is smaller than the width of the first insulating block 24, and the main grid 33 is not easy to leak out of the second insulating block 34 and connect to the fourth fine grid 32, resulting in a local short circuit in the solar cell, thereby affecting the photoelectric conversion efficiency of the solar cell.

[0099] Alternatively, if Figures 1 to 4 As shown, along the first direction X, the widths of at least two connection lines 232 located on both sides are smaller than the width of the main gate 33 .

[0100] In the present application embodiment, Figures 1 to 4 As shown, along the first direction X, the widths of at least two connecting lines 232 on both sides are set to be smaller than the width of the main grid 33, so as to reduce the amount of slurry used for the connecting lines 232 during the preparation of the solar cell and reduce the preparation cost of the solar cell.

[0101] For example, when there are three connection lines 232, the width of the connection lines 232 on both sides can be set to be smaller than the width of the main grid 33, and the width of the connection line 232 in the middle can be set to be the same as the width of the main grid 33. Alternatively, when there are three connection lines 232, the widths of the three connection lines 232 can all be set to be smaller than the width of the main grid 33.

[0102] For example, along the first direction X, the width of the connection line 232 can be set to 0.1 mm, and the width of the main grid 33 can be set to 0.2 mm. Alternatively, along the first direction X, the width of the connection line 232 can be set to 0.15 mm, and the width of the main grid 33 can be set to 0.3 mm.

[0103] Optionally, along the first direction X, the first insulating block 24 has a first width at a position covering the second fine gate 22 , and the connecting lines 232 corresponding to the position and located on both sides have a first distance, and the ratio of the first width to the first distance is greater than or equal to 1.2.

[0104] In the embodiment of the present application, along the first direction X, the first width of the first insulating block 24 covering the second fine grid 22 is set to be 1.2 times or more of the first distance between the connecting wires 232 corresponding to the position and located on both sides. This prevents the connecting wires 232 located on both sides from deviating from the first insulating block 24 due to printing accuracy, causing a local short circuit in the solar cell, thereby affecting the photoelectric conversion efficiency of the solar cell.

[0105] For example, along the first direction X, the first width of the first insulating block 24 covering the second fine gate 22 can be set to 1.2 times, 1.3 times, 1.4 times, 1.5 times, etc., of the first distance between the connecting lines 232 corresponding to the position and located on both sides.

[0106] Alternatively, if Figures 1 to 9 As shown, along the first direction X, the minimum distance between the two connection lines 232 on both sides is greater than or equal to 0.6 mm; and / or, along the first direction X, the width of the joint 231 is greater than or equal to 1 mm and less than or equal to 1.5 mm.

[0107] like Figures 1 to 9 As shown, in the embodiment of the present application, along the first direction X, the minimum distance between the two connecting wires 232 located at the edge is set to be greater than or equal to 0.6 mm, so that the electrical connector can pass through the gap between the two connecting wires 232 located at the edge, avoiding damage to the connecting wires 232 during the welding process of the electrical connector to the battery cell, affecting the transmission of the current collected by the first fine grid 21 to the joint 231, reducing the current transmission efficiency, and affecting the photoelectric conversion efficiency of the solar cell.

[0108] Exemplarily, along the first direction X, the minimum distance between two connection lines 232 located at the edge can be set to 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.

[0109] In the embodiment of the present application, along the first direction X, the width of the joint portion 231 is set to be greater than or equal to 1 mm and less than or equal to 1.5 mm, so that the width of the joint portion 231 is greater than the width of the electrical connector and less than the width of the first insulating block 24. Thus, the connection between the joint portion 231 and the electrical connector is more reliable, and the joint portion 231 will not leak out of the first insulating block 24 and connect to the second fine grid 22, causing a local short circuit in the solar cell and affecting the photoelectric conversion efficiency of the solar cell.

[0110] For example, along the first direction X, the width of the engagement portion 231 may be set to 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, or the like.

[0111] Reference Fig.11 , showing the structure of the solar cell described in the embodiment of the present application Figure 10 .

[0112] In some optional embodiments, Fig.11 As shown, the first graphic area 20 has a plurality of first fine grids 21 and a plurality of second fine grids 22 extending along the first direction X, and the plurality of first fine grids 21 and the plurality of second fine grids 22 are alternately arranged along the second direction Y, so as to collect the current generated by the battery cell body 10 near the first side edge 11 or the second side edge through the first fine grids 21 and the second fine grids 22.

[0113] The floating grid line 23 includes a joint portion 231 and a main connection line 233 connected to the joint portion 231, and the main connection line 233 extends along the second direction Y. The joint portion 231 and the main connection line 233 are connected to the first fine grid 21 to collect the current collected by the first fine grid 21. A first insulating block 24 is provided between the joint portion 231 and the main connection line 233 and the second fine grid 22 to prevent the joint portion 231 and the main connection line 233 from being connected to the second fine grid 22, resulting in a local short circuit of the solar cell, thereby affecting the photoelectric conversion efficiency of the solar cell.

[0114] It should be noted that the main connection line 233 is stacked above the first fine grid 21 and the first insulating block 24 . Due to the arrangement of the first insulating block 24 , the main connection line 233 is supported and is away from the battery cell body 10 .

[0115] The second graphic area 30 has a plurality of third fine grids 31 and a plurality of fourth fine grids 32 extending along the first direction X. The plurality of third fine grids 31 and the plurality of fourth fine grids 32 are alternately arranged along the second direction Y to collect the current generated at the middle position of the battery cell body 10 through the third fine grids 31 and the fourth fine grids 32.

[0116] like Fig.11 As shown, since the main grid is not provided in the second graphic area 30, during the processing of the photovoltaic module, the electrical connector is extended along the second direction Y and connected to the third fine grid 31 to collect the current collected by the third fine grid 31. The electrical connector can also be connected to the joint 231 and the main connection line 233 to collect the current collected by the first fine grid 21.

[0117] However, since the main connection line 233 is supported, it is far away from the battery cell body 10, and the main connection line 233 will also support the electrical connector, resulting in the electrical connector being far away from the battery cell body 10. Therefore, in the embodiment of the present application, a junction block is provided between the third fine grid 31 and the electrical connector, so as to connect the third fine grid 31 and the electrical connector through the junction block, thereby improving the reliability of the connection between the electrical connector and the third fine grid 31. Furthermore, the junction block can also support the electrical connector, so that the height of the electrical connector is consistent, thereby avoiding defects such as cracks in the battery cell during the lamination process.

[0118] Furthermore, in the embodiment of the present application, a second insulating block 34 is provided between the fourth fine grid 32 and the electrical connector, so as to block the fourth fine grid 32 and the electrical connector through the second insulating block 34, thereby preventing the electrical connector from being connected to the fourth fine grid 32, thereby causing a local short circuit in the solar cell and affecting the photoelectric conversion efficiency of the solar cell. Furthermore, the second insulating block 34 can also support the electrical connector, so that the height of the electrical connector is consistent, thereby preventing defects such as cracks in the cell during the lamination process.

[0119] It should be noted that, along the second direction Y, a widening portion may be provided at the relative position between the third fine grid 31 and the bonding block to increase the contact area between the third fine grid 31 and the bonding block, thereby further improving the reliability of the connection between the third fine grid 31 and the electrical connector.

[0120] It should be noted that in the embodiment of the present application, the thickness of the first insulating block 24 is equivalent to the thickness of the second insulating block 34. In other words, the thickness of the first insulating block 24 is equal to the thickness of the second insulating block 34, or the thickness of the first insulating block 24 differs from the thickness of the second insulating block 34 by less than 10%.

[0121] Exemplarily, the thickness of the first insulating block 24 and the thickness of the second insulating block 34 are both greater than or equal to 20 μm and less than or equal to 80 μm. For example, the thickness of the first insulating block 24 is 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, etc. The thickness of the second insulating block 34 is 20 μm, 35 μm, 45 μm, 55 μm, 65 μm, 75 μm, etc.

[0122] The present application discloses a back-contact solar cell and a photovoltaic module, wherein the back-contact solar cell comprises a cell body, wherein the cell body comprises a first surface and a second surface arranged opposite to each other, wherein the first surface comprises a first side edge and a second side edge arranged opposite to each other along a second direction; and a first graphic region, wherein the first graphic region is arranged at a position of the first surface close to the first side edge, wherein the first graphic region comprises a plurality of first fine grids and a plurality of second fine grids extending along a first direction and arranged alternately and spaced apart along the second direction, and a suspended grid line extending along the second direction, wherein the suspended grid line is connected to the plurality of first fine grids, and a first insulating block is respectively arranged between the suspended grid line and each of the second fine grids, and wherein the suspended grid line comprises a joint portion and at least two connecting lines connected to the joint portion; wherein the second direction intersects with the first direction.

[0123] In the present application, along the second direction, the first surface of the battery cell body has a first side edge and a second side edge that are relatively arranged, and the first graphic area is arranged on the first surface of the battery cell body and is located at a position of the first surface close to the first side edge. The first graphic area has a plurality of first fine grids and a plurality of second fine grids that extend along the first direction and are alternately arranged along the second direction, so as to collect the current generated by the battery cell body through the plurality of first fine grids and the plurality of second fine grids, thereby improving the current collection efficiency of the edge area of ​​the battery cell.

[0124] Furthermore, the first graphic area also has a suspended gate line extending along the second direction, the suspended gate line is connected to the plurality of first fine grids, and a first insulating block is respectively arranged between the suspended gate line and each second fine grid, so as to collect the current collected by the plurality of first fine grids through the suspended gate line, and block a second fine grid and the suspended gate line through each first insulating block, so as to avoid short circuit in the solar cell.

[0125] Furthermore, the floating grid line in the present application includes a joint portion and at least two connecting lines connected to the joint portion. It can be understood that the floating grid line is arranged in the first graphic area, and the current collected by the plurality of first fine grids is collected by the floating grid line, and the main grid is no longer required in the first graphic area, thereby reducing the amount of main grid slurry, reducing the preparation cost of solar cell sheets, and improving the market competitiveness of solar cell sheets.

[0126] The embodiment of the present application further discloses a photovoltaic module, which includes at least two back-contact solar cells as described in the above embodiment; and an electrical connector, which extends along the second direction Y and is connected to the joint portion 231 .

[0127] The photovoltaic assembly in the embodiment of the present application includes at least two back-contact solar cells described in the above embodiment, and the at least two solar cells are arranged in sequence along the second direction Y. The electrical connector extends along the second direction Y, and the electrical connector at least partially covers the joint portion 231 to be connected to the joint portion 231, so that the current collected by the joint portion 231 can be transmitted to the external circuit through the electrical connector.

[0128] It should be noted that the back-contact solar cell included in the photovoltaic module disclosed in the embodiment of the present application has the same structure as the back-contact solar cell described in the above embodiment, and its beneficial effects are also similar, which will not be described in detail here.

[0129] Optionally, along the first direction X, the minimum width between two connection lines 232 located on both sides is greater than the width of the electrical connection member.

[0130] In the embodiment of the present application, along the first direction X, the minimum width between the two connecting wires 232 on both sides is set to be greater than the width of the electrical connector, so as to avoid the disconnection and damage of the connecting wire 232 during the welding of the electrical connector to the solar cell, resulting in the inability of the current collected by the first fine grid 21 to be transmitted to the joint 231, thereby affecting the current transmission efficiency of the solar cell.

[0131] Optionally, along the first direction X, the width of the electrical connector is greater than the width of the main grid 33 ; and / or the electrical connector has a first projection on the plane where the solar cell is located, and the first projection covers the main grid 33 .

[0132] In the embodiment of the present application, the width of the electrical connector is set to be greater than the width of the main grid 33 along the first direction X, so that the electrical connector can cover the main grid 33 and be electrically connected to the main grid 33, thereby conducting the current collected by the main grid 33 to the external circuit. Furthermore, the width of the main grid 33 is smaller than the width of the electrical connector, and in the process of preparing solar cells, the amount of slurry used for the main grid 33 can be reduced, the preparation cost of solar cells can be reduced, and the market competitiveness of solar cells can be improved.

[0133] In the embodiment of the present application, the first projection of the electrical connector on the plane where the solar cell is located is set to cover the main grid 33, so that the electrical connector can be connected to the main grid 33 to conduct the current collected by the main grid 33 to the external circuit, thereby avoiding the electrical connector from being offset, resulting in the current collected by the main grid 33 being unable to be conducted to the external circuit, affecting the photoelectric conversion efficiency of the solar cell.

[0134] Optionally, along the second direction Y, one end of the electrical connector is located between the first side edge 11 and the joint portion 231 .

[0135] In the embodiment of the present application, along the second direction Y, one end of the electrical connector is set to be located between the first side 11 and the joint portion 231, so that the electrical connector can cover the entire joint portion 231 to transmit the current collected by the joint portion 231 to the external circuit, thereby improving the current transmission efficiency.

[0136] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0137] Although the optional embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0138] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0139] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. At the same time, for those skilled in the art, according to the principle and implementation mode of the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A back-contact solar cell, characterized in that: include: A battery cell body, wherein the battery cell body has a first surface and a second surface arranged opposite to each other, and the first surface has a first side edge and a second side edge arranged opposite to each other along a second direction; a first graphic region, the first graphic region being disposed at a position of the first surface close to the first side, the first graphic region having a plurality of first fine grids and a plurality of second fine grids extending along a first direction and arranged alternately and spaced along a second direction, and a floating gate line extending along the second direction, the floating gate line being connected to the plurality of first fine grids, and a first insulating block being disposed between the floating gate line and each of the second fine grids, and the floating gate line comprising a joint portion and at least two connecting lines connected to the joint portion; The second direction intersects with the first direction.

2. The back-contact solar cell according to claim 1, characterized in that: Along the second direction, at least two of the connection lines are located close to the first side edge, and the joining portion is located relatively far away from the first side edge.

3. The back-contact solar cell according to claim 1, characterized in that: The first insulating block disposed between at least two of the connection lines and the same second fine gate is continuous.

4. The back-contact solar cell according to claim 3, characterized in that: Along the first direction, the maximum width between two connecting lines located at two sides is smaller than the maximum width of the first insulating blocks.

5. The back-contact solar cell according to claim 1, characterized in that: The connecting wire includes a connecting wire body and a protruding portion protruding from the connecting wire body along an extending direction perpendicular to the connecting wire body, and the protruding portion is located between two adjacent first insulating blocks.

6. The back-contact solar cell according to claim 5, characterized in that: A recessed structure that is concave toward the connecting line body is formed at a position where the protrusion intersects the first fine grid.

7. The back-contact solar cell according to claim 1, characterized in that: The first insulating block closest to the first side has a first width, and the first insulating block closest to the joint has a second width, and the first width is greater than the second width.

8. The back-contact solar cell according to claim 7, characterized in that: Along the direction from the joint portion toward the first side edge, the widths of the plurality of first insulating blocks along the first direction increase in sequence.

9. The back-contact solar cell according to claim 1, characterized in that: The connecting wires include two connecting wires, which are arranged on the same side of the joint portion along the second direction, and one ends of the two connecting wires are sequentially connected to the joint portion along the first direction.

10. The back-contact solar cell according to claim 9, characterized in that: The other ends of the two connecting lines are away from each other; Alternatively, the two connecting lines are arranged in parallel along the second direction.

11. The back-contact solar cell according to claim 1, characterized in that: The three connection lines are arranged on the same side of the joint portion along the second direction, and one ends of the three connection lines are sequentially connected to the joint portion along the first direction.

12. The back-contact solar cell according to claim 11, characterized in that: Along the first direction, the connecting line located in the middle extends along the second direction, and the other ends of the connecting lines located on both sides are away from each other; Alternatively, the three connection lines are all arranged in parallel along the second direction.

13. The back-contact solar cell according to claim 12, characterized in that: Along the first direction, the width of the connecting line located in the middle is greater than the width of the connecting lines located at both sides.

14. The back-contact solar cell according to claim 1, characterized in that: It also includes a second graphic area and a main grid, wherein, The second graphic area is disposed on the first surface and is adjacent to the first graphic area along the second direction; The second graphic region has a plurality of third fine grids and a plurality of fourth fine grids extending along the first direction and arranged alternately and spaced along the second direction, the third fine grids have the same polarity as the first fine grids, and the fourth fine grids have the same polarity as the second fine grids; The main gate extends along the second direction, is connected to the suspension gate line, is connected to a plurality of the third fine gates, and has a second insulating block disposed between the main gate and each of the fourth fine gates.

15. The back-contact solar cell according to claim 14, characterized in that: Along the first direction, a width of the first insulating block is greater than or equal to a width of the second insulating block.

16. The back-contact solar cell according to claim 14, characterized in that: Along the first direction, the width of at least two of the connection lines located on both sides is smaller than the width of the main grid.

17. The back-contact solar cell according to claim 1, characterized in that: Along the first direction, the first insulating block has a first width at a position covering the second fine grid, the connecting lines corresponding to the position and located on both sides have a first distance, and a ratio of the first width to the first distance is greater than or equal to 1.2; And / or, along the first direction, the minimum distance between the two connection lines located on both sides is greater than or equal to 0.6 mm; and / or, along the first direction, the width of the joint is greater than or equal to 1 mm and less than or equal to 1.5 mm.

18. A photovoltaic module, characterized in that: Comprising at least two back-contact solar cells according to any one of claims 1 to 17; An electrical connector extends along the second direction and is connected to the joint portion.

19. The photovoltaic module according to claim 18, characterized in that: Along the first direction, the minimum width between two connecting lines located on both sides is greater than the width of the electrical connecting member.

20. The photovoltaic module according to claim 18, characterized in that: Along the second direction, one end portion of the electrical connector is located between the first side and the joint portion.

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