Back contact type battery piece and photovoltaic module

Abstract

The invention discloses a back contact type battery piece and a photovoltaic module, and belongs to the technical field of photovoltaic modules. The battery piece is provided with a first surface and a second surface which are oppositely arranged, and the first surface is provided with a first transmission area and a second transmission area which extend along a first direction and are alternately arranged at intervals along a second direction; the first transmission area is provided with a first current collection grid line group, the first current collection grid line group comprises at least one first current collection grid line, the first current collection grid line extends along a first direction, the first current collection grid line group on the same first transmission area comprises a first current collection grid line segment and a second current collection grid line segment, and the first current collection grid line segment and the second current collection grid line segment extend along a second direction. The width of the first collector grid line segment along the second direction is greater than that of the second collector grid line segment along the second direction; the second transmission area is provided with a second current collection grid line, the second current collection grid line is provided with a second insulation block, and the projection of the second insulation block and the projection of the second current collection grid line segment in the second direction are at least partially overlapped.

Description

Technical Field

[0001] This application relates to the field of photovoltaic module technology, specifically to a back-contact solar cell and a photovoltaic module. Background Technology

[0002] A back-contact photovoltaic (PV) module includes a solar cell. The back of the solar cell has a first transmission region and a second transmission region extending along a first direction and alternately arranged along a second direction, as well as an isolation region located between the first and second transmission regions. A first collector grid line extending along the first direction is disposed on the first transmission region, and a second collector grid line extending along the first direction is disposed on the second transmission region. The first collector grid line collects charge carriers generated in the first transmission region, and the second collector grid line collects charge carriers generated in the second transmission region. The back of the solar cell also has a first solder strip and a second solder strip extending along the second direction and alternately arranged along the first direction. The first solder strip contacts and is electrically connected to the first collector grid line to collect the charge carriers collected by the first collector grid line. A second insulating block is disposed between the first solder strip and the second collector grid line to insulate and isolate the first solder strip and the second collector grid line, preventing them from contacting and conducting, which could lead to a partial short circuit in the PV module and affect its photoelectric conversion efficiency. The second solder strip contacts and is electrically connected to the second collector grid line to collect the charge carriers collected by the second collector grid line. A first insulating block is provided between the second solder strip and the first collector grid line to insulate and isolate the second solder strip and the first collector grid line, so as to prevent the second solder strip from contacting and conducting with the first collector grid line, which would cause a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0003] In related technologies, since the area ratio of the PN junction is usually large, the width of the first transmission region along the second direction is greater than the width of the second transmission region along the second direction. In order to improve the collection efficiency of the carriers in the first transmission region, multiple first collector grid lines can be set in the first transmission region to collect the carriers generated in the first transmission region through multiple first collector grid lines.

[0004] However, the multiple first collector grid lines are spaced apart along the second direction in the first transmission region, resulting in the first collector grid lines being relatively close to the isolation region. Organic components in the second insulating block can easily penetrate into the interior of the first collector grid lines, causing an increase in the resistance of the first collector grid lines and affecting the photoelectric conversion efficiency of the photovoltaic module. Summary of the Invention

[0005] This application discloses a back-contact solar cell and a photovoltaic module to solve the problem in the prior art where organic components in the second insulating block can easily penetrate into the interior of the first collector grid, causing the resistance of the first collector grid to increase and affecting the photoelectric conversion efficiency of the photovoltaic module.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, this application discloses a back-contact solar cell, the solar cell having a first surface and a second surface disposed opposite to each other, the first surface having a first transmission region and a second transmission region extending along a first direction and alternately spaced along a second direction, the second direction intersecting the first direction; a first current collector grid line group is disposed on the first transmission region, the first current collector grid line group including at least one first current collector grid line, the first current collector grid line extending along the first direction, the first current collector grid line group on the same first transmission region including a first current collector grid line segment and a second current collector grid line segment, the width of the first current collector grid line segment along the second direction being greater than the width of the second current collector grid line segment along the second direction; a second current collector grid line is disposed on the second transmission region, a second insulating block is disposed on the second current collector grid line, the projections of the second insulating block and the second current collector grid line segment in the second direction at least partially overlap.

[0007] In some embodiments, the first collector grid line group on the same first transmission area further includes a first collector grid line transition section, the first collector grid line transition section being connected between the first collector grid line segment and the second collector grid line segment, the first collector grid line segment having the same width in the second direction; and / or, the second collector grid line segment having the same width in the second direction.

[0008] In some embodiments, along the direction of the second collector gate segment toward the first collector gate segment, the width of the first collector gate transition segment gradually increases in the second direction; and / or, the minimum width of the first collector gate transition segment in the second direction is equal to the width of the second collector gate segment in the second direction; and / or, the maximum width of the first collector gate transition segment in the second direction is equal to the width of the first collector gate segment in the second direction.

[0009] In some embodiments, the width of the first collector grid segment in the second direction is L1, satisfying 0.1mm≤L1≤0.8mm; and / or, the width of the second collector grid segment in the second direction is L2, satisfying 0mm<L2≤0.5mm; and / or, the length of the second collector grid segment in the first direction is L5, satisfying 1mm≤L5≤7mm.

[0010] In some embodiments, the length of the first collector grid line transition segment in the first direction is L4, satisfying 0mm≤L4≤2mm; and / or, the length of the second collector grid line segment in the first direction is L5, satisfying L5>L4.

[0011] In some embodiments, the width of the first transmission area in the second direction is L6, satisfying 150μm≤L6≤800μm; and / or, the width of the first transmission area in the second direction is greater than the width of the second transmission area in the second direction.

[0012] In some embodiments, in the second direction, the distance between the first transmission region near the edge of the second collector grid segment and the edge of the second collector grid segment near the first transmission region is L7, satisfying L7≥100μm; and / or, satisfying L7≥L6 / 4.

[0013] In some embodiments, in the second direction, the distance between the first transmission region and the edge of the first collector grid segment near the first transmission region is L9, satisfying L9≤L6 / 4.

[0014] In some embodiments, the width of the first collector gate segment in the second direction is L1, and the width of the second collector gate segment in the second direction is L2, satisfying 1 < L1 / L2 ≤ 12.

[0015] In some embodiments, the length of the second insulating block in the first direction is L8, satisfying 1mm ≤ L8 ≤ 5mm; and / or, the length of the second collector grid segment in the first direction is L5, satisfying L5 ≥ L8. In some embodiments, the first collector grid line group on the same first transmission area further includes a third collector grid line segment. In the first direction, the third collector grid line segment is spaced apart from the second collector grid line segment. The first collector grid line segment is connected between the third collector grid line segment and the second collector grid line segment. The width of the first collector grid line segment along the second direction is greater than the width of the third collector grid line segment along the second direction. A first insulating block is provided on the third collector grid line segment, and the first insulating block covers at least a portion of the third collector grid line segment.

[0016] In some embodiments, the same first collector grid line group includes two first collector grid lines, which are spaced apart along the second direction.

[0017] In some embodiments, the width of each of the first collector grid lines along the second direction is less than or equal to the width of the second collector grid line along the second direction.

[0018] In some embodiments, in the second direction, the first transmission region includes an edge transmission region located at the edge of the cell, the width of the edge transmission region in the second direction being smaller than the width of the remaining first transmission regions in the second direction; the first collector grid line group on the edge transmission region includes a first collector grid line; and / or, the first collector grid line on the edge transmission region is closer in the second direction to the side of the edge transmission region away from the edge of the cell.

[0019] Secondly, this application also discloses a photovoltaic module, which includes a plurality of solar cells as described in the first aspect; a first electrical connector extending along a second direction, the first electrical connector being disposed on the side of the second insulating block away from the solar cells, and the first electrical connector being electrically connected to the first collector grid line group.

[0020] This application discloses a back-contact solar cell and a photovoltaic module. The solar cell has a first surface and a second surface disposed opposite to each other. The first surface has a first transmission region and a second transmission region that extend along a first direction and are alternately arranged along a second direction, the second direction intersecting the first direction. A first collector grid line group is disposed on the first transmission region. The first collector grid line group includes at least one first collector grid line, which extends along the first direction. The first collector grid line group on the same first transmission region includes a first collector grid line segment and a second collector grid line segment. The width of the first collector grid line segment along the second direction is greater than the width of the second collector grid line segment along the second direction. A second collector grid line is disposed on the second transmission region. A second insulating block is disposed on the second collector grid line. The projections of the second insulating block and the second collector grid line segment in the second direction at least partially overlap.

[0021] The back-contact solar cell disclosed in this application has a first current collector grid line group disposed on a first transmission region. The first current collector grid line group includes at least one first current collector grid line extending along a first direction, which collects charge carriers in the first transmission region. A second current collector grid line is disposed on a second transmission region extending along the first direction, which collects charge carriers in the second transmission region. The first current collector grid line group on the same first transmission region includes a first current collector grid line segment and a second current collector grid line segment. The projection of the second current collector grid line segment onto the second current collector grid line in a second direction at least partially overlaps with the projection of the second insulating block disposed on the second current collector grid line in a second direction. The width of the first current collector grid line segment along the second direction is greater than the width of the second current collector grid line segment along the second direction. On the one hand, the narrower second current collector grid line segment increases the distance between it and the adjacent second insulating block in the second direction, preventing organic components in the second insulating block from diffusing and penetrating into the interior of the second current collector grid line segment, ensuring the conductivity of the second current collector grid line segment, and ensuring the photoelectric conversion efficiency of the back-contact solar cell. On the other hand, the wider first collector grid segment shortens its distance from the adjacent second transmission region in the second direction, allowing the charge carriers generated in the second transmission region to be collected by the first collector grid segment with a shorter path, reducing recombination losses during transmission. In summary, this design achieves a synergistic balance between improving charge carrier collection efficiency and preventing the diffusion of insulating adhesive from affecting the grid line conductivity, thus optimizing the overall photoelectric conversion efficiency and reliability of the back-contact solar cell. Attached Figure Description

[0022] Figure 1 This is a schematic diagram showing the structure of the solar cell described in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the solar cell described in another embodiment of this application; Figure 3 express Figure 1 A partial enlarged view of the solar cell; Figure 4 This is a partial cross-sectional view of the solar cell described in the embodiments of this application; Figure 5 This is a schematic diagram of the structure of the photovoltaic module described in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of the photovoltaic module described in another embodiment of this application; Figure 7 express Figure 1 A partial enlarged view B of the solar cell described in the figure.

[0023] Figure label: 10: Battery cells; 11: First collector grid line group; 111: First collector grid line; 112: First collector grid line segment; 113: Second collector grid line segment; 114: Third collector grid line segment; 115: First collector grid line transition section; 12: Second collector grid line; 13: First insulating block; 14: Second insulating block; 15: First electrical connection; 16: Second electrical connection; X: First direction; Y: Second direction. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of the present invention.

[0025] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0026] This application discloses a back-contact battery cell. The battery cell has a first surface and a second surface disposed opposite to each other. The first surface has a first transmission region and a second transmission region that extend along a first direction X and are alternately arranged along a second direction Y, with the second direction Y intersecting the first direction X. A first collector grid line group 11 is disposed on the first transmission region. The first collector grid line group 11 includes at least one first collector grid line 111, which extends along the first direction X. The first collector grid line group 11 on the same first transmission region includes a first collector grid line segment 112 and a second collector grid line segment 113. The width of the first collector grid line segment 112 along the second direction Y is greater than the width of the second collector grid line segment 113 along the second direction Y. A second collector grid line 12 is disposed on the second transmission region. A second insulating block 14 is disposed on the second collector grid line 12. The projections of the second insulating block 14 and the second collector grid line segment 113 in the second direction Y at least partially overlap.

[0027] This application discloses a back-contact solar cell, in which both the positive and negative current collector lines are located on the back side of the cell to prevent them from obstructing the front side, thereby improving the photoelectric conversion efficiency. Furthermore, the location of both the positive and negative current collector lines on the back side also enhances the cell's appearance, resulting in a more aesthetically pleasing design.

[0028] In the thickness direction of the solar cell, the solar cell 10 has a first surface and a second surface disposed opposite to each other. When the first surface is the back side of the solar cell 10, the second surface is the front side of the solar cell 10. When the first surface is the front side of the solar cell 10, the second surface is the back side of the solar cell 10.

[0029] The following description will use the example of the first surface being the back side of the battery cell 10 and the second surface being the front side of the battery cell 10 to illustrate the back contact battery cell disclosed in this application.

[0030] The back side of the solar cell 10, also known as the backlight side of the solar cell 10, refers to the side of the solar cell 10 that faces away from sunlight. The front side of the solar cell 10, also known as the light-receiving side of the solar cell 10, refers to the side of the solar cell 10 that faces sunlight. The back side and the front side of the solar cell 10 are arranged opposite each other along the thickness direction of the solar cell 10.

[0031] The back-contact battery cell disclosed in this application has a first transmission region and a second transmission region extending along a first direction X and arranged alternately along a second direction Y on its first surface, as well as an isolation region located between the first transmission region and the second transmission region. The isolation region blocks the first transmission region and the second transmission region, preventing the first transmission region and the second transmission region from conducting and causing a partial short circuit in the battery cell 10.

[0032] The first transport region is provided with a first current collector grid line group 11, which forms an electrical connection between the first transport region and the first doped layer to collect the charge carriers generated by the first doped layer. The second transport region is provided with a second current collector grid line 12, which forms an electrical connection between the second transport region and the second doped layer to collect the charge carriers generated by the second doped layer. This improves the overall electrical performance of the solar cell 10, reduces the manufacturing cost of the solar cell 10, and enhances the product competitiveness of the solar cell 10.

[0033] like Figure 1 and Figure 2As shown, a first collector gate line group 11 is provided on the first transmission region. The first collector gate line group 11 includes at least one first collector gate line 111. The first collector gate line 111 extends along the first direction X and electrically connects the first transmission region and the first doped layer to collect the carriers generated by the first doped layer.

[0034] For example, the first collector grid line 111 includes two lines, both extending along a first direction X and spaced apart along a second direction Y. Alternatively, the first collector grid line 111 includes three lines, all extending along the first direction X and spaced apart along the second direction Y. Alternatively, the first collector grid line 111 includes four lines, all extending along the first direction X and spaced apart along the second direction Y. By providing multiple first collector grid lines 111, the distance from the charge carriers in the first transmission region to the first collector grid line 111 can be shortened, thereby improving the collection efficiency of the charge carriers.

[0035] Of course, the above are merely individual examples of the specific number of the first collector wires 111 and are not intended to limit this application. In practical applications, those skilled in the art can set the number of the first collector wires 111 as needed.

[0036] The following description will use the example of two first collector grid lines 111, both of which extend along the first direction X and are spaced apart along the second direction Y, to illustrate the battery cell disclosed in this application.

[0037] like Figure 1 and Figure 2 As shown, the first collector grid line group 11 on the same first transmission area includes a first collector grid line segment 112 and a second collector grid line segment 113. The first collector grid line segment 112 includes multiple segments, and the multiple first collector grid line segments 112 are arranged at intervals along the first direction X. A second collector grid line segment 113 is provided between two adjacent first collector grid line segments 112. The two adjacent first collector grid line segments 112 are connected by the second collector grid line segment 113 to form a first collector grid line group 11 extending along the first direction X.

[0038] It should be noted that the width of the first collector grid segment 112 along the second direction Y is greater than the width of the second collector grid segment 113 along the second direction Y. This can be understood as the width of the first collector grid segment 112 along the second direction Y being the distance between the centerlines of the two first collector grid lines 111 included in the first collector grid segment 112 along the second direction Y, or the maximum width of the two first collector grid lines 111 included in the first collector grid segment 112, i.e., the distance between the outermost edges of the two first collector grid lines 111, or the minimum width of the two first collector grid lines 111 included in the first collector grid segment 112, i.e., the distance between the innermost edges of the two first collector grid lines 111. The width of the second collector grid segment 113 along the second direction Y is the same as or similar to the definition of the first collector grid segment, and will not be repeated here to avoid repetition. Alternatively, the minimum width of the first collector grid segment 112 along the second direction Y is greater than or equal to the maximum width of the second collector grid segment 113 along the second direction Y. Alternatively, the average width of the first collector grid segment 112 along the second direction Y is greater than the average width of the second collector grid segment 113 along the second direction Y, etc., all of the above situations are within the protection scope of this application. Figure 1 and Figure 2 As shown, a second insulating block 14 is disposed on the second collector grid line 12, and the projections of the second insulating block 14 and the second collector grid line segment 113 in the second direction Y at least partially overlap. That is, the second insulating block 14 and the second collector grid line segment 113 are at least partially spaced apart from each other in the second direction Y. By setting the width of the first collector grid line segment 112 in the second direction Y to be greater than the width of the second collector grid line segment 113 in the second direction Y, on the one hand, the narrower second collector grid line segment 113 increases its distance from the second insulating block 14 in the second direction Y, preventing the organic components in the second insulating block 14 from diffusing and penetrating into the interior of the second collector grid line segment 113, ensuring the conductivity of the second collector grid line segment 113, and ensuring the photoelectric conversion efficiency of the back contact solar cell. On the other hand, the wider first collector grid line segment 112 shortens its distance from the adjacent second transmission region in the second direction Y, so that the charge carriers generated in the second transmission region can be collected by the first collector grid line segment 112 with a shorter path, reducing recombination losses during transmission. In summary, this design achieves a synergistic balance between improving carrier collection efficiency and preventing the diffusion of insulating adhesive from affecting the conductivity of the grid lines, thus optimizing the overall photoelectric conversion efficiency and reliability of the back-contact solar cell.

[0039] It should be noted that, in this embodiment of the application, only one second collector grid line 12 may be provided on the second transmission area, and the second collector grid line 12 extends along the first direction X. Alternatively, multiple second collector grid lines 12 may be provided on the second transmission area, all extending along the first direction X and spaced apart along the second direction Y.

[0040] For example, two second collector grid lines 12 may be provided on the second transmission area, or three second collector grid lines 12 may be provided on the second transmission area, or four second collector grid lines 12 may be provided on the second transmission area, etc.

[0041] When two or more second collector grid lines 12 are provided on the second transmission area, the second collector grid line 12 includes a third collector grid line segment and a fourth collector grid line segment. The width of the third collector grid line segment in the second direction Y is greater than the width of the fourth collector grid line segment in the second direction Y. A first insulating block is provided on the first collector grid line group, and the projections of the first insulating block and the fourth collector grid line segment in the second direction Y at least partially overlap.

[0042] On the one hand, the narrower fourth collector grid segment increases its distance from the first insulating block in the second direction Y, preventing organic components in the first insulating block from diffusing and penetrating into the interior of the fourth collector grid segment, thus ensuring the conductivity of the fourth collector grid segment and guaranteeing the photoelectric conversion efficiency of the back-contact solar cell. On the other hand, the wider third collector grid segment shortens its distance from the adjacent first transmission region in the second direction Y, allowing the charge carriers generated in the first transmission region to be collected by the third collector grid segment along a shorter path, reducing recombination losses during transmission. In summary, this design achieves a synergistic balance between improving charge carrier collection efficiency and preventing the diffusion of insulating adhesive from affecting the grid line conductivity, thereby optimizing the overall photoelectric conversion efficiency and reliability of the back-contact solar cell.

[0043] The following description will use the example of a second collector grid line 12 being provided on the second transmission area, which extends along the first direction X and is spaced apart along the second direction Y, to illustrate the battery cell disclosed in this application.

[0044] In one preferred embodiment, the solar cell 10 is a hybrid back-contact solar cell.

[0045] like Figure 4 As shown, taking a hybrid back-contact solar cell as an example, the first transport region includes a substrate, an intrinsic amorphous silicon layer, a P-type doped layer, and a TCO layer stacked sequentially. The P-type doped layer includes a P-type doped amorphous and / or microcrystalline silicon layer. The second transport region includes a substrate, a tunneling oxide layer, an N-type doped polycrystalline silicon layer, and a TCO layer stacked sequentially. The transparent conductive layer is partially disconnected to avoid short circuits. In the thickness direction of the solar cell, the second transport region protrudes from the first transport region; that is, the first transport region is recessed relative to the second transport region. Therefore, the insulating adhesive of the second insulating block 14 is more likely to overflow into the first transport region in the second direction Y. Therefore, the second current collector segment 113 is narrowed in the second direction Y, a design that is more suitable for hybrid back-contact solar cells.

[0046] In other embodiments, the solar cell 10 is a tunneling oxide passivated back-contact solar cell. The first transport region includes a substrate, a tunneling oxide layer, and a P-type doped polysilicon layer stacked sequentially. The second transport region includes a substrate, a tunneling oxide layer, and an N-type doped polysilicon layer stacked sequentially. A gap region is also provided between adjacent first and second transport regions to avoid short circuits.

[0047] In some embodiments, such as Figure 3 As shown, the first collector grid line group 11 on the same first transmission area also includes a first collector grid line transition section 115, which is connected between the first collector grid line segment 112 and the second collector grid line segment 113; the first collector grid line segment 112 has the same width in the second direction Y; and / or, the second collector grid line segment 113 has the same width in the second direction Y.

[0048] like Figure 3 As shown, in the solar cell disclosed in this application embodiment, on the same first transmission region, the first collector grid segment 112 and the second collector grid segment 113 have the same width in the second direction Y, but the width of the first collector grid segment 112 in the second direction Y is greater than the width of the second collector grid segment 113 in the second direction Y. In the first direction X, the first collector grid segment 112 and the second collector grid segment 113 are spaced apart, and the first collector grid line transition segment 115 is disposed between the first collector grid segment 112 and the second collector grid segment 113, with one end of the first collector grid line transition segment 115 connected to the first collector grid segment 112 and the other end connected to the second collector grid segment 113. Thus, the second collector grid segment 113 and the first collector grid segment 112 are connected through the first collector grid line transition section 115, so that the charge carriers collected by the first collector grid segment 112 can be transmitted to the second collector grid segment 113 through the first collector grid line transition section 115, and then transmitted to the external electrical connector through the second collector grid segment 113, and finally transmitted to the external circuit through the external electrical connector.

[0049] In this embodiment, a first collector grid line transition section 115 is provided between the first collector grid line segment 112 and the second collector grid line segment 113. The width of the first collector grid line transition section 115 gradually decreases along the direction from the first collector grid line 112 towards the second collector grid line 113. This gradually reduces the width of the first collector grid line group 11 in the second direction Y, increasing the distance between the second collector grid line segment 113 and the second insulating block 14 in the second direction Y. This prevents organic components in the second insulating block 14 from diffusing and penetrating into the interior of the second collector grid line segment 113, ensuring the conductivity of the second collector grid line segment 113 and guaranteeing the photoelectric conversion efficiency of the back-contact solar cell. The method for determining the width of the first collector grid line transition section 115 can refer to the aforementioned description of the width; to avoid repetition, it will not be repeated here.

[0050] In some embodiments, such as Figure 3 As shown, along the direction of the second collector grid line segment 113 toward the first collector grid line segment 112, the width of the first collector grid line transition segment 115 gradually increases in the second direction Y; and / or, the minimum width of the first collector grid line transition segment 115 in the second direction Y is equal to the width of the second collector grid line segment 113 in the second direction Y; and / or, the maximum width of the first collector grid line transition segment 115 in the second direction Y is equal to the width of the first collector grid line segment 112 in the second direction Y.

[0051] like Figure 3 As shown, since the width of the first collector gate segment 112 along the second direction Y is greater than the width of the second collector gate segment 113 along the second direction Y, the width of the first collector gate transition segment 115 along the second direction Y is set to gradually increase along the direction of the second collector gate segment 113 toward the first collector gate segment 112, so that one end of the first collector gate transition segment 115 can be connected to the second collector gate segment 113 and the other end can be connected to the first collector gate segment 112, so that the first collector gate segment 112 and the second collector gate segment 113 can be connected through the first collector gate transition segment 115.

[0052] like Figure 3 As shown, the second collector grid segment 113 has a uniform width along the second direction Y. The minimum width of the first collector grid line transition segment 115 along the second direction Y is set to be equal to the width of the second collector grid segment 113 along the second direction Y. This allows the end of the second collector grid segment 113 near the first collector grid line transition segment 115 to be connected to the collector grid line transition segment 115, ensuring the continuity of the first collector grid line 111, preventing grid breakage, and affecting the carrier collection efficiency.

[0053] The width of the first collector grid line segment 112 along the second direction Y is greater than the width of the second collector grid line segment 113 along the second direction Y. Therefore, the maximum width of the first collector grid line transition segment 115 along the second direction Y is set to be equal to the width of the first collector grid line segment 112 along the second direction Y. In this way, the end of the first collector grid line transition segment 115 near the first collector grid line segment 112 can be connected to the first collector grid line segment 112, so as to ensure the continuity of the first collector grid line 111, prevent grid breakage, and affect the carrier collection efficiency.

[0054] In some embodiments, such as Figure 3As shown, the width of the first collector grid segment 112 in the second direction Y is L1, satisfying 0.1mm≤L1≤0.8mm; and / or, the width of the second collector grid segment 113 in the second direction Y is L2, satisfying 0mm<L2≤0.5mm; and / or, the length of the second collector grid segment 113 in the first direction X is L5, satisfying 1mm≤L5≤7mm.

[0055] like Figure 3 As shown in this embodiment, the width L1 of the first collector grid segment 112 along the second direction Y is set to be greater than or equal to 0.1 mm and less than or equal to 0.8 mm. The width L2 of the second collector grid segment 113 along the second direction Y is set to be greater than 0 mm and less than or equal to 0.5 mm. Through this setting, on the one hand, the width of the second collector grid segment 113 along the second direction Y is less than the width of the first collector grid segment 112 along the second direction Y, thereby increasing the distance between the second collector grid segment 113 and the second insulating block 14 in the second direction Y. This allows for the expansion of organic components from the second insulating block 14, preventing the organic components in the second insulating block 14 from diffusing and penetrating into the interior of the second collector grid segment 113, ensuring the conductivity of the second collector grid segment 113, and ensuring the photoelectric conversion efficiency of the back-contact solar cell. On the other hand, the width of the first collector grid segment 112 along the second direction Y is wider, which shortens the distance between it and the adjacent second transmission region in the second direction Y, so that the charge carriers generated by the second transmission region can be collected by the first collector grid segment 112 with a shorter path, reducing recombination losses during transmission.

[0056] If the width L1 of the first collector grid segment 112 in the second direction Y is less than 0.1 mm, then the width of the first collector grid segment 112 in the second direction Y is too small, resulting in limited gain for carrier collection and affecting the photoelectric conversion efficiency of the solar cell. Furthermore, it will increase the cost of metallization of the solar cell, leading to excessively high manufacturing costs and impacting the product competitiveness of the solar cell.

[0057] If the width L1 of the first collector grid segment 112 in the second direction Y is greater than 0.8 mm, then the width of the first collector grid segment 112 in the second direction Y is too large, resulting in an excessively long transmission path for the carriers generated in the first transmission region, which is not conducive to the collection of carriers in the first transmission region, thereby affecting the photoelectric conversion efficiency of the solar cell.

[0058] If the width L2 of the second collector grid segment 113 in the second direction Y is greater than 0.5 mm, the distance between the second collector grid segment 113 and the second insulating block 14 in the second direction Y is small. The organic components of the second insulating block 14 are more likely to diffuse and penetrate into the interior of the second collector grid segment 113, affecting the conductivity of the second collector grid segment 113 and thus affecting the photoelectric conversion efficiency of the solar cell.

[0059] For example, the width L1 of the first collector segment 112 along the second direction Y can be set to 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc. The width L2 of the second collector segment 113 along the second direction Y can be set to 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc.

[0060] In this embodiment, the length L5 of the second current collector segment 113 along the first direction X is set to be greater than or equal to 1 mm and less than or equal to 7 mm. This ensures that the width of the second current collector segment 113 along the first direction X is greater than or equal to the width of the second insulating block 14 along the first direction X. This allows the length of the second current collector segment 113 in the first direction X to match the length of the second insulating block 14 in the first direction X, preventing organic components in the second insulating block 14 from diffusing and penetrating into the interior of the second current collector segment 113, thus ensuring the conductivity of the second current collector segment 113 and guaranteeing the photoelectric conversion efficiency of the back-contact solar cell.

[0061] For example, the length L5 of the second collector grid segment 113 in the first direction X can be set to 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, etc.

[0062] In some embodiments, such as Figure 3 As shown, the length of the first collector grid line transition segment 115 in the first direction X is L4, satisfying 0mm≤L4≤2mm; and / or, the length of the second collector grid line segment 113 in the first direction X is L5, satisfying L5>L4.

[0063] like Figure 3As shown in this embodiment, the length L4 of the first collector gate line transition segment 115 in the first direction X is set to be greater than or equal to 0 mm and less than or equal to 2 mm. For example, the length L4 of the first collector gate line transition segment 115 in the first direction X can be set to 0 mm, that is, the first collector gate line transition segment 115 is a gate line segment extending along the second direction Y. Alternatively, the length L4 of the first collector gate line transition segment 115 along the first direction X can be set to 0.5 mm, 0.7 mm, 1.0 mm, 1.3 mm, 1.5 mm, 1.8 mm, 2.0 mm, etc. In this embodiment, no specific limitations are imposed; in practical applications, those skilled in the art can set it as needed.

[0064] In this embodiment, the length L4 of the first collector grid line transition segment 115 along the first direction X is set to be greater than or equal to 0 mm and less than or equal to 2 mm. This allows the first collector grid line transition segment 115 to connect the second collector grid line segment 113 to the first collector grid line segment 112. Furthermore, the first collector grid line transition segment 115 is not excessively long along the first direction X. Since the distance between the first collector grid line transition segment 115 and the second insulating block 14 along the second direction Y is closer, if the first collector grid line transition segment 115 were too long along the first direction X, organic molecules in the second insulating block 14 could easily diffuse and penetrate into the interior of the first collector grid line transition segment 115, affecting the conductivity of the first collector grid line transition segment 115 and consequently affecting the photoelectric conversion efficiency of the photovoltaic module.

[0065] In this embodiment, the length L5 of the second collector grid segment 113 along the first direction X is set to be greater than the length L4 of the first collector grid transition segment 115 along the first direction X. This ensures that the length of the second collector grid segment 113 along the first direction X is sufficiently long, and that the distance between the second collector grid transition segment 115 and the second insulating block 14 along the second direction Y is greater. This better prevents the organic components in the second insulating block 14 from diffusing and penetrating into the interior of the second collector grid transition segment 115, ensuring the conductivity of the second collector grid transition segment 115, and thus ensuring the photoelectric conversion efficiency of the back-contact solar cell. In some embodiments, the width of the first transmission region in the second direction Y is L6, satisfying 150μm≤L6≤800μm; and / or, the width of the first transmission region in the second direction Y is greater than the width of the second transmission region in the second direction Y.

[0066] In this embodiment, the conductivity type of the first transmission region is opposite to that of the second transmission region. For example... Figure 4As shown, a first collector grid line group 11 is provided in the first transmission region to collect the charge carriers generated in the first transmission region. A second collector grid line 12 is provided in the second transmission region to collect the charge carriers generated in the second transmission region.

[0067] In this embodiment, since the conductivity type of the second transmission region is the same as that of the solar cell substrate, and the conductivity type of the first transmission region is opposite to that of the solar cell substrate, the first transmission region is a minority carrier collection region. To balance current matching, compensate for mobility differences, and ensure minority carrier collection, the width of the first transmission region in the second direction Y is set to be greater than the width of the second transmission region in the second direction Y. Further, as... Figure 7 As shown, the width L6 of the first transmission region in the second direction Y is greater than or equal to 150 μm and less than or equal to 800 μm.

[0068] For example, the width of the second transmission region in the second direction Y can be set to 140μm, 160μm, 180μm, 200μm, or 220μm. The width L6 of the first transmission region in the second direction Y can be set to 150μm, 200μm, 300μm, 400μm, 500μm, 520μm, 590μm, 600μm, 700μm, or 800μm, etc.

[0069] In some embodiments, such as Figure 7 As shown, in the second direction Y, the distance between the first transmission region and the edge of the second collector grid segment 113 is L7, which satisfies L7≥100μm; and / or, L7≥L6 / 4.

[0070] In this embodiment, in the second direction Y, the distance L7 between the edge of the first transmission region near the second collector grid segment 113 and the edge of the second collector grid segment 113 near the first transmission region is set to be greater than or equal to 100 μm. This ensures that the distance between the second collector grid segment 113 and the edge of the first transmission region in the second direction Y is large enough, thereby ensuring that the distance between the second collector grid segment 113 and the second insulating block 14 in the second direction Y is large enough. This prevents the organic components in the second insulating block 14 from diffusing and penetrating into the interior of the second collector grid segment 113, ensuring the conductivity of the second collector grid segment 113 and ensuring the photoelectric conversion efficiency of the back contact solar cell.

[0071] For example, in the second direction Y, the distance L7 between the edge of the first transmission region near the second collector grid segment 113 and the edge of the second collector grid segment 113 near the first transmission region can be set to 100μm, 120μm, 140μm, 150μm, 170μm, 200μm, etc.

[0072] In this embodiment, in the second direction Y, the distance L7 between the edge of the first transmission region near the second collector grid segment 113 and the edge of the second collector grid segment 113 near the first transmission region is set to be greater than or equal to 1 / 4 of the width L6 of the first transmission region in the second direction Y. This ensures that the second collector grid segment 113 is closer to the middle region of the first transmission region, thus maintaining a sufficiently large distance from the edge of the first transmission region along the second direction Y. This ensures a sufficiently large distance between the second collector grid segment 113 and the second insulating block 14 along the second direction Y, thereby preventing the organic components in the second insulating block 14 from diffusing and penetrating into the interior of the second collector grid segment 113, ensuring the conductivity of the second collector grid segment 113, and ensuring the photoelectric conversion efficiency of the back-contact solar cell.

[0073] In some embodiments, such as Figure 7 As shown, in the second direction Y, the distance between the first transmission region and the edge of the first collector grid segment 112 is L9, which satisfies L9≤L6 / 4.

[0074] In this embodiment, in the second direction Y, the distance L9 between the edge of the first transmission region near the first collector grid segment 112 and the edge of the first collector grid segment 112 near the first transmission region is set to be less than or equal to 1 / 4 of the width L6 of the first transmission region in the second direction Y. This results in a shorter distance between the first collector grid segment 112 and the adjacent second transmission region in the second direction Y, allowing the charge carriers generated in the second transmission region to be collected by the first collector grid segment 112 with a shorter path. This reduces recombination losses during transmission, improves carrier collection efficiency, and ultimately enhances the photoelectric conversion efficiency of the solar cell.

[0075] In some embodiments, such as Figure 3 As shown, the width of the first collector grid segment 112 in the second direction Y is L1, and the width of the second collector grid segment 113 in the second direction Y is L2, satisfying 1 < L1 / L2 ≤ 12.

[0076] In this embodiment, the ratio of the width L1 of the first current collector segment 112 along the second direction Y to the width L2 of the second current collector segment 113 along the second direction Y is set to be greater than 1 and less than or equal to 12. This ensures that the width of the second current collector segment 113 in the second direction Y is small, while the distance between the second current collector segment 113 and the second insulating block 14 in the second direction Y is large. This prevents organic components in the second insulating block 14 from diffusing and penetrating into the interior of the second current collector segment 113, ensuring the conductivity of the second current collector segment 113 and guaranteeing the photoelectric conversion efficiency of the back-contact solar cell.

[0077] For example, the ratio of the width L1 of the first collector grid segment 112 along the second direction Y to the width L2 of the second collector grid segment 113 along the second direction Y can be set to 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0078] In some embodiments, such as Figure 1 As shown, the length of the second insulating block 14 in the first direction X is L8, which satisfies 1mm≤L8≤5mm; and / or, the length of the second collector grid segment 113 in the first direction X is L5, which satisfies L5≥L8.

[0079] In the embodiments of this application, such as Figure 1 As shown, the length L8 of the second insulating block 14 along the first direction X is set to be greater than or equal to 1 mm and less than or equal to 5 mm. This ensures that the second insulating block 14 is long enough along the first direction X to insulate and isolate the first electrical connector 15 and the second collector grid line 12, preventing the first electrical connector 15 and the second collector grid line 12 from contacting and conducting, which could lead to a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0080] In this embodiment, the length L5 of the second current collector segment 113 in the first direction X is set to be greater than or equal to the length L8 of the second insulating block 14 in the first direction X. This ensures that in the second direction Y, the second current collector segment 113 is generally far from the second insulating block 14 and its length is well matched with that of the insulating block 14. This prevents organic components in the second insulating block 14 from diffusing and penetrating into the interior of the second current collector segment 113, ensuring the conductivity of the second current collector segment 113 and ensuring the photoelectric conversion efficiency of the back-contact solar cell.

[0081] In some embodiments, such as Figure 2 As shown, the first collector grid line group 11 on the same first transmission area also includes a third collector grid line segment 114. In the first direction X, the third collector grid line segment 114 and the second collector grid line segment 113 are spaced apart. The first collector grid line segment 112 is connected between the third collector grid line segment 114 and the second collector grid line segment 113. The width of the first collector grid line segment 112 along the second direction Y is greater than the width of the third collector grid line segment 114 along the second direction Y. A first insulating block 13 is provided on the third collector grid line segment 114, and the first insulating block 13 covers at least a portion of the third collector grid line segment 114.

[0082] In the embodiments of this application, such as Figure 2As shown, the first collector grid line group 11 on the same first transmission area includes a first collector grid line segment 112, a second collector grid line segment 113, and a third collector grid line segment 114. The third collector grid line segment 114 and the first collector grid line segment 112 are spaced apart, and the second collector grid line segment 113 is connected between the adjacent third collector grid line segment 114 and the first collector grid line segment 112, so as to form the first collector grid line group 11 through the first collector grid line segment 112, the second collector grid line segment 113, and the third collector grid line segment 114.

[0083] The third collector grid segment 114 is provided with a first insulating block 13, which covers at least a portion of the third collector grid segment 114. This first insulating block 13 insulates and isolates the second electrical connector 16 and the third collector grid segment 114, preventing them from conducting and causing a partial short circuit in the photovoltaic module, thus affecting the photovoltaic module's photoelectric conversion efficiency.

[0084] It should be noted that, in the second direction Y, the width of the third collector grid segment 114 is smaller than the width of the first collector grid segment 112. In other words, in the second direction Y, the width of the first collector grid segment 112 is greater than the width of the third collector grid segment 114. This reduces the width of the first insulating block 13 on the third collector grid segment 114 along the second direction Y, allowing the narrower first insulating block 13 to insulate and isolate the second electrical connector 16 and the third collector grid segment 114. This prevents the third collector grid segment 114 from conducting with the second electrical connector 16, thus avoiding a partial short circuit in the photovoltaic module and affecting its photoelectric conversion efficiency.

[0085] Furthermore, the narrower width of the first insulating block 13 in the second direction Y can also prevent the organic components in the first insulating block 13 from diffusing and penetrating into the interior of the second current collector grid line 12, thus ensuring the conductivity of the second current collector grid line 12 and ensuring the photoelectric conversion efficiency of the back contact solar cell.

[0086] In some embodiments, such as Figure 1 and Figure 2 As shown, the same first collector grid line group 11 includes two first collector grid lines 111, which are spaced apart along the second direction Y.

[0087] In the embodiments of this application, such as Figure 1 and Figure 2 As shown, each first collector grid line group 11 includes two first collector grid lines 111 spaced apart along the second direction Y. The design of the two first collector grid lines 111 can meet the current balance requirements of the first transmission region and the second transmission region, ensuring the photoelectric conversion efficiency of the solar cell 10.

[0088] Furthermore, the above configuration can also reduce the number of first current collector lines 111 in each first current collector line group 11, thereby controlling the overall material usage of the first current collector line group 11, and thus controlling the manufacturing cost of the solar cell 10 and improving the product competitiveness of the solar cell 10.

[0089] It should be noted that each of the above first collector grid line groups 11 includes two first collector grid lines 111 spaced apart along the second direction Y. This is merely a specific example of the specific structure of the first collector grid line group 11 in this application embodiment and is not intended to limit this application. In practical applications, those skilled in the art can also set the specific number of first collector grid lines 111 included in each group of first collector grid lines 11 as needed.

[0090] In some embodiments, such as Figure 1 and Figure 2 As shown, the width of each first collector grid line 111 along the second direction Y is less than or equal to the width of the second collector grid line 12 along the second direction Y.

[0091] In the embodiments of this application, such as Figure 1 and Figure 2 As shown, the same first collector grid line group 11 includes two first collector grid lines 111. The width of each first collector grid line 111 along the second direction Y is set to be less than or equal to the width of each second collector grid line 12 along the second direction Y. This reduces the width of the first collector grid line 111 along the second direction Y while ensuring the carrier collection efficiency of the first collector grid line 111, thereby reducing the material usage of the first collector grid line 111, thus reducing the manufacturing cost of the solar cell 10 and improving the product competitiveness of the solar cell 10.

[0092] In some embodiments, in the second direction Y, the first transmission region includes an edge transmission region located at the edge of the cell 10, the width of the edge transmission region in the second direction Y being smaller than the width of the remaining first transmission regions in the second direction Y; the first collector grid line group on the edge transmission region includes a first collector grid line 111; and / or, the first collector grid line 111 on the edge transmission region is closer to the side of the edge transmission region away from the edge of the cell 10 in the second direction Y.

[0093] In the fabrication of solar cells, a printing process is typically used to form a first current collector line 111 in a first transmission region and a second current collector line 12 in a second transmission region. During the printing process of the first current collector line 111 and the second current collector line 12, the screen tension is greatest when printing the lines near the outermost edge in the second direction Y. This causes the screen to wear more easily in the edge area of ​​the second direction Y, affecting the lifespan of the screen. If the first current collector line 111 in the edge transmission region is positioned towards the side away from the edge of the solar cell 10 in the second direction Y, the wear in the edge area of ​​the screen can be reduced, thereby extending the lifespan of the screen, reducing the fabrication cost of the solar cell, and improving the product competitiveness of the solar cell.

[0094] Furthermore, because the first collector grid line 111 on the edge transport region is closer to the side of the edge transport region away from the edge of the solar cell 10 in the second direction Y, the transport path of carriers on the side of the edge transport region closer to the edge of the solar cell 10 is increased. If the width of the edge transport region in the second direction Y is too wide, the transport path of carriers on the side of the edge transport region closer to the edge of the solar cell 10 will be even longer. Therefore, the width of the edge transport region in the second direction Y is set to be smaller than the width of the other first transport regions in the second direction Y, thereby ensuring the collection efficiency of carriers on the side of the edge transport region closer to the edge of the solar cell 10, thereby ensuring the photoelectric conversion efficiency of the solar cell and improving the product competitiveness of the solar cell.

[0095] This application also discloses a photovoltaic module, which includes a plurality of battery cells 10 as described in the above embodiments; a first electrical connector 15, which extends along a second direction Y, and is disposed on the side of the second insulating block 14 away from the battery cells 10, and is electrically connected to a first collector grid line group 11.

[0096] like Figure 5 and Figure 6 As shown in the illustration, this application also discloses a photovoltaic module, which is a back-contact photovoltaic module. Back-contact photovoltaic modules have advantages such as high photoelectric conversion efficiency and aesthetically pleasing appearance.

[0097] The photovoltaic module disclosed in this application includes the back-contact solar cell, the first electrical connector 15, and the second electrical connector 16 described in the above embodiments. Both the first electrical connector 15 and the second electrical connector 16 are disposed on the back side of the solar cell 10. The first electrical connector 15 is disposed on the side of the second insulating block 14 away from the solar cell 10, so as to insulate and isolate the first electrical connector 15 and the second collector grid line 12 through the second insulating block 14, preventing the first electrical connector 15 and the second collector grid line 12 from contacting and conducting, thus avoiding a partial short circuit in the photovoltaic module. The second electrical connector 16 is disposed on the side of the first insulating block 13 away from the solar cell 10, so as to insulate and isolate the second electrical connector 16 and the first collector grid line group 11 through the first insulating block 13, thus preventing the second electrical connector 16 and the first collector grid line group 11 from contacting and conducting, thus avoiding a partial short circuit in the photovoltaic module.

[0098] Of course, the first electrical connector 15 contacts and is connected to the first collector grid line group 11 to collect the charge carriers collected by the first collector grid line group 11 and transmit the collected charge carriers to the external circuit. The second electrical connector 16 contacts and is connected to the second collector grid line 12 to collect the charge carriers collected by the second collector grid line 12 and transmit the collected charge carriers to the external circuit.

[0099] It should be noted that the photovoltaic module disclosed in this application includes a solar cell 10 with the same structure as the back-contact solar cell described in the above embodiments, and its beneficial effects are the same or similar. Therefore, it will not be repeated here.

[0100] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0101] Although alternative embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the alternative embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0102] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or terminal device that includes that element.

[0103] The technical solution provided by the present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the principle and implementation of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A back-contact battery cell, characterized in that, The battery cell (10) has a first surface and a second surface disposed opposite to each other. The first surface has a first transmission area and a second transmission area that extend along a first direction (X) and are alternately spaced along a second direction (Y). The second direction (Y) intersects the first direction (X). A first collector grid line group (11) is provided on the first transmission area. The first collector grid line group (11) includes at least one first collector grid line (111). The first collector grid line (111) extends along the first direction (X). The first collector grid line group (11) on the same first transmission area includes a first collector grid line segment (112) and a second collector grid line segment (113). The width of the first collector grid line segment (112) along the second direction (Y) is greater than the width of the second collector grid line segment (113) along the second direction (Y). A second collector grid line (12) is provided on the second transmission area, and a second insulating block (14) is provided on the second collector grid line (12). The projections of the second insulating block (14) and the second collector grid line segment (113) in the second direction (Y) at least partially overlap.

2. The back-contact battery cell according to claim 1, characterized in that, The first collector grid line group (11) on the same first transmission area also includes a first collector grid line transition section (115), which is connected between the first collector grid line segment (112) and the second collector grid line segment (113); The first collector grid segment (112) is of equal width in the second direction (Y); and / or, the second collector grid segment (113) is of equal width in the second direction (Y).

3. The back-contact battery cell according to claim 2, characterized in that, Along the second collector grid line segment (113) toward the direction close to the first collector grid line segment (112), the width of the first collector grid line transition segment (115) gradually increases in the second direction (Y); And / or, the minimum width of the first collector grid line transition segment (115) in the second direction (Y) is equal to the width of the second collector grid line segment (113) in the second direction (Y); And / or, the maximum width of the first collector grid line transition segment (115) in the second direction (Y) is equal to the width of the first collector grid line segment (112) in the second direction (Y).

4. The back-contact battery cell according to claim 1, characterized in that, The width of the first collector grid segment (112) in the second direction (Y) is L1, which satisfies 0.1mm≤L1≤0.8mm; And / or, the width of the second collector grid segment (113) in the second direction (Y) is L2, satisfying 0mm < L2 ≤ 0.5mm; And / or, the length of the second collector grid segment (113) in the first direction (X) is L5, satisfying 1mm≤L5≤7mm.

5. The back-contact battery cell according to claim 2, characterized in that, The length of the first collector grid line transition section (115) in the first direction (X) is L4, which satisfies 0mm≤L4≤2mm; And / or, the length of the second collector grid segment (113) in the first direction (X) is L5, satisfying L5 > L4.

6. The back-contact battery cell according to claim 1, characterized in that, The width of the first transmission area in the second direction (Y) is L6, which satisfies 150μm≤L6≤800μm; And / or, the width of the first transmission area in the second direction (Y) is greater than the width of the second transmission area in the second direction (Y).

7. The back-contact battery cell according to claim 6, characterized in that, In the second direction (Y), the distance between the first transmission region and the edge of the second collector grid segment (113) is L7, which satisfies L7≥100μm; And / or, satisfying L7≥L6 / 4.

8. The back-contact battery cell according to claim 6, characterized in that, In the second direction (Y), the distance between the first transmission region and the edge of the first collector grid segment (112) is L9, which satisfies L9≤L6 / 4.

9. The back-contact battery cell according to claim 1, characterized in that, The width of the first collector grid segment (112) in the second direction (Y) is L1, and the width of the second collector grid segment (113) in the second direction (Y) is L2, satisfying 1 < L1 / L2 ≤ 12.

10. The back-contact battery cell according to claim 1, characterized in that, The length of the second insulating block (14) in the first direction (X) is L8, which satisfies 1mm≤L8≤5mm; And / or, the length of the second collector grid segment (113) in the first direction (X) is L5, satisfying L5≥L8.

11. The back-contact battery cell according to claim 1, characterized in that, The first collector grid line group (11) on the same first transmission area also includes a third collector grid line segment (114). In the first direction (X), the third collector grid segment (114) and the second collector grid segment (113) are spaced apart, the first collector grid segment (112) is connected between the third collector grid segment (114) and the second collector grid segment (113), and the width of the first collector grid segment (112) along the second direction (Y) is greater than the width of the third collector grid segment (114) along the second direction (Y); A first insulating block (13) is provided on the third collector grid segment (114), and the first insulating block (13) covers at least a portion of the third collector grid segment (114).

12. The back-contact battery cell according to claim 1, characterized in that, The same first collector grid line group (11) includes two first collector grid lines (111), which are spaced apart along the second direction (Y).

13. The back-contact battery cell according to claim 12, characterized in that, The width of each of the first collector grid lines (111) along the second direction (Y) is less than or equal to the width of the second collector grid line (12) along the second direction (Y).

14. The back-contact battery cell according to claim 1, characterized in that, In the second direction (Y), the first transmission area includes an edge transmission area located at the edge of the battery cell (10), the width of the edge transmission area in the second direction (Y) being smaller than the width of the remaining first transmission areas in the second direction (Y); The first collector grid line group (11) on the edge transmission area includes a first collector grid line (111). And / or, the first collector grid line (111) on the edge transmission region is closer to the side of the edge transmission region away from the edge of the cell (10) in the second direction (Y).

15. A photovoltaic module, characterized in that, Includes the battery cell (10) according to any one of claims 1-14. The first electrical connector (15) extends along the second direction (Y) and is disposed on the side of the second insulating block (14) away from the battery cell (10). The first electrical connector (15) is electrically connected to the first collector grid line group (11).

Images