Battery piece assembly, battery string, photovoltaic assembly and photovoltaic power generation system

Abstract

The utility model discloses a battery piece assembly, a battery string, a photovoltaic assembly and a photovoltaic power generation system, the battery piece assembly comprises at least one battery piece, a plurality of connecting pieces and at least one bus bar, and the battery piece comprises a battery piece body, a plurality of grid lines and a plurality of grid line connecting lines. Therefore, the arrangement of the grid line connecting lines is suitable for collecting the current collected by each grid line segment to the connecting pieces and transmitting the current to the bus bar, the first connecting pieces and the second connecting pieces are connected with the first grid lines and the second grid lines respectively, and the current is collected through the grid line connecting lines, so that the current collection efficiency can be remarkably improved, and the energy loss is reduced; the overall performance of the battery piece assembly is optimized, a connecting piece is prevented from being arranged between the bus bar and the grid line connecting line, the situation that in the lamination process of the battery piece assembly, pressure is applied to the battery pieces through the connecting piece, and consequently the edge battery pieces are large in stress and cracked is reduced, and the risk of battery piece cracking is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module technology, and in particular to a cell module, a cell string, a photovoltaic module and a photovoltaic power generation system. Background Technology

[0002] In the prior art, back-contact photovoltaic modules consist of several cell strings connected in series by solder strips, and the current is collected and output through a busbar located between two adjacent cells. The busbar covers part of the non-polar grid lines, and the current on these grid lines cannot be collected, which reduces the current collection efficiency of the cells. At the same time, it reduces the output power and efficiency of the photovoltaic module. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, the first objective of the present invention is to provide a solar cell assembly that can improve the current collection and transmission efficiency of the solar cell assembly.

[0004] The second objective of this invention is to provide a battery string, including the battery cell assembly described in the above embodiments.

[0005] The third objective of this invention is to provide a photovoltaic module, including the cell assembly or cell string described in the above embodiments.

[0006] The fourth objective of this invention is to provide a photovoltaic power generation system, including the cell assembly, cell string, or photovoltaic module described in the above embodiments.

[0007] A battery cell assembly according to a first aspect of the present invention includes: at least one battery cell, a plurality of connectors, and at least one busbar. The battery cell includes a battery cell body, a plurality of grid lines, and a plurality of grid line connecting lines. The grid lines include a plurality of first grid lines and a plurality of second grid lines with different polarities. The plurality of first grid lines and the plurality of second grid lines are alternately spaced along a first direction on at least one side surface of the battery cell body in the thickness direction. The plurality of connectors include a plurality of first connectors and a plurality of second connectors. The plurality of first connectors are electrically connected to the plurality of first grid lines, and the plurality of second connectors are electrically connected to the plurality of second grid lines. The grid line connecting lines are electrically connected to the second connectors and / or the first connectors. The busbar is disposed at an end of the battery cell body along the first direction and on one side of the battery cell body in the thickness direction. The busbar is electrically connected to the first connectors and / or the second connectors, and is insulated from the second connectors and / or the first connectors. The busbar is also insulated from the grid line connecting lines.

[0008] According to the battery cell assembly of this utility model embodiment, the grid line connection line is configured to collect the current collected by each grid line segment to the connector and transmit it to the busbar. By connecting the first connector and the second connector to the first grid line and the second grid line respectively, and collecting the current through the grid line connection line, this design can significantly improve the current collection efficiency, reduce energy loss, and optimize the overall performance of the battery cell assembly. It avoids setting a connector between the busbar and the grid line connection line, reducing the pressure applied to the battery cell during the battery cell assembly lamination process through the connector, which could cause the edge battery cell to crack due to high stress, and effectively reducing the risk of battery cell cracking.

[0009] In some embodiments, each first grid line includes a plurality of first grid line segments, adjacent two first grid line segments are spaced apart to define a first opening, and the first openings of the plurality of first grid lines are opposite to each other along a first direction. Each second grid line includes a plurality of second grid line segments, adjacent two second grid line segments are spaced apart to define a second opening, and the second openings of the plurality of second grid lines are opposite to each other along a first direction. The first openings and second openings are staggered along the first direction. A plurality of grid line connecting lines are disposed at the ends of the battery cell body along the first direction. The grid line connecting lines are located at the first opening and / or the second opening, and the grid line connecting lines connect at least two second grid line segments and / or at least two... A first grid line segment, wherein a plurality of first connectors are respectively disposed at a plurality of second openings, the plurality of first connectors are respectively electrically connected to a plurality of first grid lines, and a plurality of second connectors are respectively disposed at a plurality of first openings, the plurality of second connectors being respectively electrically connected to a plurality of second grid lines; one end of the grid line connecting line is connected to at least two second grid line segments and / or at least two first grid line segments closest to the center of the cell body, and the other end of the grid line connecting line is sequentially connected to the second grid line segments and / or the first grid line segments facing the edge of the cell body, and extends to the first opening of the first grid line and / or the second opening of the second grid line adjacent to the edge of the cell body.

[0010] In some embodiments, the number of the plurality of gate lines connected by the gate line connection line is N, where N satisfies: 5≤N≤30.

[0011] In some embodiments, the second connector and / or the first connector covers a portion of the grid line connection, and the second connector and / or the first connector are spaced apart from the busbar to insulate it from the busbar.

[0012] In some embodiments, the length of the gate line connection covered by the second connector and / or the first connector is at least the distance between two adjacent second gate lines and / or two adjacent first gate lines.

[0013] In some embodiments, the second connector and / or the first connector covers the length of the gate wire connection line by L1, where L1 satisfies: 0 < L1 ≤ 5 mm.

[0014] In some embodiments, the length of the grid line connecting line in the first direction is less than or equal to the minimum distance between the end of the second connector and / or the first connector and the corresponding edge of the battery cell body.

[0015] In some embodiments, the length of the grid line connecting line in the first direction is greater than the width of the busbar in the first direction.

[0016] In some embodiments, the width of the grid line connecting line in the second direction is less than the maximum width of the connector in the second direction, and the second direction is perpendicular to the first direction.

[0017] In some embodiments, the width of the gate line connecting line in the second direction is greater than the maximum width of the gate line in the first direction, and the second direction is perpendicular to the first direction.

[0018] In some embodiments, the width of the gate wire connecting line in the second direction is L2, where L2 satisfies: 0 < L2 ≤ 0.5 mm.

[0019] In some embodiments, the first gate segment includes a first thickened portion, the first thickened portion being opposite to the second opening, and the first connector being connected to the first thickened portion; the second gate segment includes a second thickened portion, the second thickened portion being opposite to the first opening, and the second connector being connected to the second thickened portion, and the gate line connecting line connecting at least one second thickened portion and / or at least one first thickened portion.

[0020] In some embodiments, the width of the gate line connecting line in the second direction is smaller than the width of the first thickened portion in the first direction, and the second direction is perpendicular to the first direction.

[0021] In some embodiments, the length of the first thickened portion in the second direction is greater than the width of the first connector in the first direction; the length of the second thickened portion in the second direction is greater than the width of the second connector in the first direction, and the second direction is perpendicular to the first direction.

[0022] In some embodiments, it further includes: at least one insulating element disposed between the busbar and the grid line connection line.

[0023] In some embodiments, the first connector and / or the second connector are located between the busbar and the battery cell body, and the insulating member has a first clearance opening for avoiding the first connector and / or the second connector.

[0024] In some embodiments, the insulating element is disposed on the side surface of the battery cell body facing the busbar; or the insulating element is disposed on the side surface of the busbar facing the battery cell body.

[0025] In some embodiments, the first connector and / or the second connector are located on the side of the busbar away from the battery cell body.

[0026] In some embodiments, the insulating element is a black insulating element.

[0027] A battery string according to a second aspect of the present invention includes: a plurality of battery cell assemblies, wherein the battery cell assembly is a battery cell assembly according to the first aspect of the present invention described above, wherein the battery cells of two adjacent battery cell assemblies are spaced apart; or, the projections of the sides of the battery cells of two adjacent battery cell assemblies that are adjacent to each other along the thickness direction of the battery cells at least partially overlap.

[0028] In some embodiments, the width by which the projections of the adjacent sides of the cells of two adjacent cell assemblies overlap along the thickness direction of the cells is W, wherein W satisfies: 0.2mm≤W≤0.4mm.

[0029] A photovoltaic module according to a third aspect of the present invention includes a cell assembly according to the first aspect of the present invention, or a cell string according to the second aspect of the present invention.

[0030] A photovoltaic power generation system according to a fourth aspect of the present invention includes a battery cell assembly according to the first aspect of the present invention, a battery string according to the second aspect of the present invention, or a photovoltaic module according to the third aspect of the present invention.

[0031] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0033] Figure 1 This is a schematic diagram of a battery cell assembly according to an embodiment of the present utility model;

[0034] Figure 2 yes Figure 1 An enlarged diagram showing the configuration of busbars in the P region;

[0035] Figure 3 yes Figure 1 Enlarged schematic diagram of the P region without busbars;

[0036] Figure 4 This is a schematic diagram of a battery string according to an embodiment of the present utility model;

[0037] Figure 5 yes Figure 4 Enlarged schematic diagram of the mid-Q region;

[0038] Figure 6 yes Figure 4 An enlarged schematic diagram of the first embodiment of the R region;

[0039] Figure 7 yes Figure 4 Enlarged schematic diagram of the second embodiment of the R region;

[0040] Figure 8 yes Figure 4 Enlarged schematic diagram of the third embodiment of the R region;

[0041] Figure 9 This is a cross-sectional schematic diagram of a battery cell assembly according to a first embodiment of the present invention;

[0042] Figure 10 This is a cross-sectional schematic diagram of a second embodiment of a battery cell assembly according to the present utility model;

[0043] Figure 11 This is a cross-sectional schematic diagram of a third embodiment of a battery cell assembly according to the present utility model.

[0044] Figure label:

[0045] 100. Solar cell assembly;

[0046] 10. Solar cell; 11. Connector; 111. First connector; 112. Second connector; 12. Busbar; 13. Solar cell body; 14. Grid line; 141. First grid line; 142. First grid line segment; 143. First opening; 144. Second grid line; 145. Second grid line segment; 146. Second opening; 147. First thickened portion; 148. Second thickened portion; 15. Grid line connecting wire; 16. Insulator; 17. First clearance opening; 18. Intermediate busbar;

[0047] 200, battery string;

[0048] A. First direction; B. Second direction; C. Thickness direction. Detailed Implementation

[0049] The embodiments of this utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-11 A battery cell assembly 100 according to an embodiment of the present invention includes: at least one battery cell 10, a plurality of connectors 11, and at least one busbar 12. The battery cell assembly 100 has a first direction A and a second direction B.

[0050] Specifically, such as Figures 1-11 As shown, the solar cell 10 includes a solar cell body 13, a plurality of grid lines 14, and a plurality of grid line connecting lines 15. The grid lines 14 include a plurality of first grid lines 141 and a plurality of second grid lines 144 with different polarities. The plurality of first grid lines 141 and the plurality of second grid lines 144 are alternately arranged along a first direction A on at least one side surface of the solar cell body 13 in the thickness direction C. The plurality of connectors 11 include a plurality of first connectors 111 and a plurality of second connectors 112. The plurality of first connectors 111 are electrically connected to the plurality of first grid lines 141 respectively. Then, multiple second connectors 112 are electrically connected to multiple second grid lines 144 respectively, and grid line connecting lines 15 are electrically connected to the second connectors 112 and / or the first connectors 111. The busbar 12 is disposed at the end of the cell body 13 along the first direction A and on one side of the thickness direction of the cell body 13. The busbar 12 is electrically connected to the first connectors 111 and / or the second connectors 112. The busbar 12 is insulated from the second connectors 112 and / or the first connectors 111. The busbar 12 is insulated from the grid line connecting lines 15.

[0051] There can be two busbars 12, each located at one end of the cell body 13 along the first direction A. The busbar 12 located at one end of the cell body 13 along the first direction A is electrically connected to one end of a plurality of first connectors 111 along the first direction A. This busbar 12 is insulated from one end of a plurality of second connectors 112 along the first direction A. This busbar 12 is opposite to a plurality of second grid line connecting lines along the thickness direction C of the cell body 13, and is insulated from the plurality of second grid line connecting lines. Correspondingly, the busbar 12 located at the other end of the cell body 13 along the first direction A is electrically connected to the other end of a plurality of second connectors 112 along the first direction A. This busbar 12 is insulated from the other end of a plurality of first connectors 111 along the first direction A. This busbar 12 is opposite to a plurality of first grid line connecting lines along the thickness direction C of the cell body, and is insulated from the plurality of first grid line connecting lines.

[0052] According to the embodiment of the present invention, the battery cell assembly 100 is configured with grid line connecting lines 15 to collect the current collected by each grid line 14 segment to the connector 11 and transmit it to the busbar 12. By connecting the first connector 111 and the second connector 112 to the first grid line 141 and the second grid line 144 respectively, and collecting the current through the grid line connecting lines 15, this design can significantly improve the current collection efficiency, reduce energy loss, and optimize the overall performance of the battery cell assembly 100. It avoids the need to set the connector 11 between the busbar 12 and the grid line connecting lines 15, thereby reducing the pressure applied to the battery cell 10 during the lamination process of the battery cell assembly 100 through the connector 11, which could cause the edge battery cell 10 to crack due to high stress, and effectively reducing the risk of the battery cell 10 cracking.

[0053] According to some embodiments of this utility model, such as Figures 1-8 As shown, each first grid line 141 includes a plurality of first grid line segments 142, with adjacent first grid line segments 142 spaced apart to define a first opening 143. The first openings 143 of the plurality of first grid lines 141 are opposite to each other along a first direction A. Each second grid line 144 includes a plurality of second grid line segments 145, with adjacent second grid line segments 145 spaced apart to define a second opening 146. The second openings 146 of the plurality of second grid lines 144 are opposite to each other along the first direction A. The first openings 143 and the second openings 146 are staggered along the first direction A. A plurality of grid line connecting lines 15 are provided at the ends of the cell body 13 along the first direction A. The grid line connecting lines 15 are located at the first opening 143 and / or the second opening 146. The grid line connecting lines 15 connect at least two first grid line segments 142 and / or at least two second grid line segments 145.

[0054] Both the first grid line 141 and the second grid line 144 extend along the second direction B. Multiple first grid line segments 142 are spaced apart along the second direction B, thereby defining multiple first openings 143 spaced apart along the second direction B. The multiple first openings 143 of the multiple first grid lines 141 are opposite each other along the first direction A. Multiple second grid line segments 145 are spaced apart along the second direction B, thereby defining multiple second openings 146 spaced apart along the second direction B. The multiple second openings 146 of the multiple second grid lines 144 are opposite each other along the first direction A. The first grid lines 141 and the second grid lines 144 are arranged alternately along the first direction A, the first openings 143 and the second openings 146 are staggered along the first direction A, and the first grid line segments 142 and the second grid line segments 145 are staggered along the first direction A. The grid line connecting lines 15 extend along the first direction A. Each grid line connecting line 15 includes a first grid line connecting line and a second grid line connecting line. The second grid line connecting line is located at the first opening 143 and connected to at least two second grid line segments 145. The second grid line connecting line is located at the second opening 146 and connected to at least two first grid line segments 142. Multiple grid line connecting lines 15 are arranged at intervals along the second direction B. The grid line connecting lines 15 are located adjacent to the two sides of the cell body 13. The first grid line connecting lines and the second grid line connecting lines are respectively located on both sides of the cell body 13 along the first direction A. Multiple first grid line connecting lines are arranged in parallel at intervals along the second direction B, and multiple second grid line connecting lines are arranged in parallel at intervals along the second direction B.

[0055] First connectors 111 and second connectors 112 extend along a first direction A. Multiple first connectors 111 are respectively located at multiple second openings 146. Each first connector 111 is electrically connected to multiple first grid line segments 142 of multiple first grid lines 141. One end of each first connector 111 along the first direction A is electrically connected to a first grid line connecting line. Multiple second connectors 112 are respectively located at multiple first openings 143. Each second connector 112 is electrically connected to multiple second grid line segments 145 of multiple second grid lines 144. The other end of each second connector 112 along the first direction A is electrically connected to a second grid line connecting line.

[0056] One end of the grid line connecting line 15 is connected to the one of at least two first grid line segments 142 and / or at least two second grid line segments 145 that is closest to the center of the cell body 13. The other end of the grid line connecting line 15 is sequentially connected to the first grid line segment 142 and / or the second grid line segment 145 in the direction of the edge of the cell body 13, and extends to the first opening 143 of the first grid line 141 and / or the second opening 146 of the second grid line segment 145 adjacent to the edge of the cell body 13.

[0057] The first grid line connecting line is adapted to connect with a plurality of first grid lines 141 on the side of the adjacent cell body 13 in the first direction A. One end of the first grid line connecting line along the first direction A is connected to the one of the plurality of first grid lines 141 that is closest to the center of the cell body 13. The other end of the first grid line connecting line extends along the first direction A toward the edge of the cell body. The first grid line connecting line is connected to a plurality of first grid line segments 142 in sequence. The other end of the first grid line connecting line is located at the second opening 146 of the second grid line 144 located on the outermost side of the cell body 13 in the first direction A. The second grid line connecting line is adapted to connect with a plurality of second grid lines 144 on the other side of the adjacent cell body 13 in the first direction A. One end of the second grid line connecting line along the first direction A is connected to the one of the plurality of second grid lines 144 that is closest to the center of the cell body 13. The other end of the second grid line connecting line extends along the first direction A toward the edge of the cell body. The second grid line connecting line is connected to a plurality of second grid line segments 145 in sequence. The other end of the second grid line connecting line is located at the first opening 143 of the first grid line 141 located on the outermost side of the cell body 13 in the first direction A.

[0058] Therefore, the arrangement of the grid line connection line 15 facilitates the collection of current from the grid line 14 located at the edge of the cell body 13, improves the current collection efficiency, ensures the continuity of current transmission, and thus improves the photoelectric conversion efficiency of the cell assembly 100.

[0059] According to some embodiments of this utility model, such as Figures 1-8 As shown, the number of gate lines 14 connected by gate line connection line 15 is N, and N satisfies: 5≤N≤30.

[0060] That is, the grid line connection line 15 can collect the current on the N grid lines 14 located at the edge of the cell body 13, which facilitates the layout of the busbar 12 at the edge of the cell body 13, reduces the impact of the busbar 12 on the current collection on the grid lines 14 at the edge of the cell assembly 100, optimizes the current path, and thus improves the photoelectric conversion efficiency of the cell assembly 100.

[0061] According to some embodiments of this utility model, such as Figures 1-8 As shown, the second connector 112 and / or the first connector 111 cover a portion of the grid line 15, and the second connector 112 and / or the first connector 111 are spaced apart from the busbar 12 to insulate it from the busbar 12.

[0062] One end of the first connector 111, which is electrically connected to the busbar 12 along the first direction A, is electrically connected to a plurality of first grid lines 141 located on one side edge of the cell body 13, but no first grid line connecting lines are provided. The end of the first connector 111 that is electrically connected to the busbar 12 is directly connected to this part of the first grid lines 141. The other end of the first connector 111 that is not electrically connected to the busbar 12 along the first direction A is recessed by a certain length along the first direction A toward the center of the cell body 13. That is, the other end of the first connector 111 is spaced apart from the busbar 12 in the first direction A. The other end of the first connector 111 is not directly connected to the plurality of first grid lines 141 located on the other side edge of the cell body 13. The plurality of first grid lines 141 located on the other side edge of the cell body 13 are provided with first grid line connecting lines. The end of the other end of the first connector 111 overlaps with the end of the first grid line connecting line near the center of the cell body 13.

[0063] Similarly, the end of the second connector 112 that is electrically connected to the busbar 12 along the first direction A is connected to a plurality of second grid lines 144 located on the other side edge of the cell body 13, but no second grid line connecting lines are provided. The end of the second connector 112 that is electrically connected to the busbar 12 is directly connected to this part of the second grid lines 144. The other end of the second connector 112 that is not electrically connected to the busbar 12 along the first direction A is recessed by a certain length along the first direction A toward the center of the cell body 13. That is, the other end of the second connector 112 is spaced apart from the busbar 12 in the first direction A. The other end of the second connector 112 is not directly connected to the plurality of second grid lines 144 located on one side edge of the cell body 13. The plurality of second grid lines 144 located on one side edge of the cell body 13 are provided with second grid line connecting lines. The end of the other end of the second connector 112 overlaps with the end of the second grid line connecting line near the center of the cell body 13.

[0064] Thus, one end of the connector 11 is connected to the busbar 12 and covers the edge grid line 14, the other end of the connector 11 is spaced apart from the busbar 12 to maintain insulation, and the other end of the connector 11 is connected to the grid line connection line 15 to collect current on the grid line 14, ensuring efficient current collection and transmission, while improving the reliability of the cell assembly 100 through electrical isolation measures.

[0065] According to some embodiments of this utility model, such as Figures 1-8 As shown, the length of the second connector 112 and / or the first connector 111 covering the grid line connection line 15 is at least the distance between two adjacent second grid lines 144 and / or two adjacent first grid lines 141.

[0066] That is, the length of overlap between the other end of the first connector 111 and one end of the first grid line is at least the distance between two adjacent first grid lines 141 in the first direction A, and the length of overlap between the other end of the second connector 112 and one end of the second grid line is at least the distance between two adjacent second grid lines 144 in the first direction A.

[0067] This ensures the contact area between the connector 11 and the grid line connection 15, thereby ensuring the reliability of the connection between the connector 11 and the grid line connection 15, and ensuring that the current on the grid line 14 can be effectively collected from each grid line segment and transmitted to the connector 11, thus improving the current transmission efficiency.

[0068] According to some embodiments of this utility model, such as Figures 1-8 As shown, the second connector 112 and / or the first connector 111 cover the length of the grid line 15, which is L1, and L1 satisfies: 0 < L1 ≤ 5 mm.

[0069] If the length of the connector 11 covering the grid line 15 is greater than 5mm, the connection length between the connector 11 and the grid line 15 is too long, which is not conducive to reducing the production cost of the battery cell assembly 100.

[0070] Therefore, by limiting the length range of the grid line connection line 15 covered by the connector 11, the production cost of the cell assembly 100 can be reduced while ensuring that current is effectively collected and transmitted from each grid line segment to the connector 11.

[0071] According to some embodiments of this utility model, such as Figures 1-5 As shown, the length of the grid line connecting line 15 in the first direction A is less than or equal to the minimum distance between the end of the second connector 112 and / or the first connector 111 and the corresponding edge of the cell body 13.

[0072] That is, the length of the first grid line connecting line in the first direction A is less than or equal to the distance between the other end of the first connector 111 and the corresponding edge of the battery cell body 13, and the length of the second grid line connecting line in the second direction B is less than or equal to the distance between the other end of the second connector 112 and the corresponding edge of the battery cell body 13.

[0073] Therefore, by limiting the length of the grid connection line 15, it is easier to optimize the layout of the grid connection line 15 on the cell body 13, ensuring the current collection efficiency of the grid connection line 15 while reducing the material used of the grid connection line 15 and lowering the cost of the grid connection line 15.

[0074] According to some embodiments of this utility model, such as Figures 1-8 As shown, the length of the grid line 15 in the first direction A is greater than the width of the bus bar 12 in the first direction A.

[0075] The busbar 12 extends along the second direction B, and the length of the grid line 15 in the first direction A is longer than the width of the busbar 12 in the first direction A, that is, the busbar 12 will not completely cover the grid line 15.

[0076] Therefore, the length of the grid line connecting line 15 in the first direction A is greater than the width of the bus bar 12 in the first direction A, which facilitates the connection between the grid line connecting line 15 and the connector 11, ensures that there is a certain gap between the connector 11 and the bus bar 12 when the connector 11 is connected to the grid line connecting line 15, ensures the insulation design between the bus bar 12 and the corresponding connector 11, avoids short circuits, and improves the overall reliability of the battery cell assembly 100.

[0077] According to some embodiments of this utility model, such as Figures 1-8 As shown, the width of the grid line connecting line 15 in the second direction B is less than the maximum width of the connector 11 in the second direction B, and the second direction B is perpendicular to the first direction A.

[0078] This ensures that at the point where the connector 11 overlaps with the grid wire 15, the connector 11 can completely cover the grid wire 15, ensuring that the current on the grid wire 15 can be effectively collected and transmitted to the connector 11, and ensuring the electrical connection between the connector 11 and the grid wire 15.

[0079] According to some embodiments of this utility model, such as Figures 1-8 As shown, the width of the gate line connecting line 15 in the second direction B is greater than the maximum width of the gate line 14 in the first direction A, and the second direction B is perpendicular to the first direction A.

[0080] That is, the width of the grid line connection line 15 is wider than the width of the grid line 14, which can ensure the current collection efficiency of the grid line connection line 15, reduce the resistance loss in the current transmission path, and improve the current transmission efficiency of the cell assembly 100.

[0081] According to some embodiments of this utility model, such as Figures 1-8 As shown, the width of the grid line connecting line 15 in the second direction B is L2, and L2 satisfies: 0 < L2 ≤ 0.5 mm.

[0082] By limiting the width of the grid line connection line 15 in the second direction B, it can be ensured that the current is effectively collected from each grid line 14 segment and transmitted to the connector 11, ensuring that the grid line connection line 15 can provide sufficient current transmission area, improving the uniformity and reliability of current collection, and guaranteeing the current transmission efficiency.

[0083] According to some embodiments of this utility model, such as Figures 1-8As shown, the first gate line segment 142 includes a first thickened portion 147, which is opposite to the second opening 146, and the first connector 111 is connected to the first thickened portion 147; the second gate line segment 145 includes a second thickened portion 148, which is opposite to the first opening 143, and the second connector 112 is connected to the second thickened portion 148; the gate line connecting line 15 connects at least one second thickened portion 148 and / or at least one first thickened portion 147.

[0084] The first thickened portion 147 is formed by thickening the portion of the first grid line segment 142 opposite to the second opening 146 along the first direction A. The first thickened portion 147 is opposite to and connected to the first connector 111 along the thickness direction C of the cell body 13. The second thickened portion 148 is formed by thickening the portion of the second grid line segment 145 opposite to the first opening 143 along the first direction A. The second thickened portion 148 is opposite to and connected to the second connector 112 along the thickness direction C of the cell body 13. The first grid line connecting line is adapted to connect to the first thickened portion 147 of the corresponding plurality of first grid line segments 142, and the second grid line connecting line is adapted to connect to the second thickened portion 148 of the corresponding plurality of second grid line segments 145.

[0085] Therefore, the first connector 111 is connected to the first thickened portion 147, and the second connector 112 is connected to the second thickened portion 148. This increases the current transmission area between the connector 11 and the gate line segments, ensuring that current is effectively collected from each gate line segment 14 and transmitted to the connector 11. This ensures a reliable connection between the connector 11 and the gate line segments 14, reducing the risk of poor contact. The connection between the gate line connecting line 15 and the thickened portion helps improve the current collection efficiency of the gate line connecting line 15.

[0086] According to some embodiments of this utility model, such as Figures 1-8 As shown, the width of the grid line connecting line 15 in the second direction B is smaller than the width of the first thickened portion 147 in the first direction A, and the second direction B is perpendicular to the first direction A.

[0087] That is, the width of the grid line connecting line 15 is smaller than the width of the thickened part, which can reduce the amount of material used and reduce costs while ensuring the reliability of the connection between the grid line connecting line 15 and the grid line 14 segment.

[0088] According to some embodiments of this utility model, such as Figures 1-8 As shown, the length of the first thickened portion 147 in the second direction B is greater than the width of the first connector 111 in the first direction A; the length of the second thickened portion 148 in the second direction B is greater than the width of the second connector 112 in the first direction A, and the second direction B is perpendicular to the first direction A.

[0089] That is, the first thickened portion 147 is longer in the second direction B, and the second thickened portion 148 is also longer in the second direction B, which can provide a larger current transmission area, facilitate the connection between the first connector 111 and the first thickened portion 147, and between the second connector 112 and the second thickened portion 148, ensure the reliability of the electrical connection between the first connector 111 and the first gate segment 142 through the first thickened portion 147, ensure the reliability of the electrical connection between the second connector 112 and the first gate segment 142 through the second thickened portion 148, and ensure the effectiveness and reliability of the current transmission path.

[0090] According to some embodiments of this utility model, such as Figures 9-11 As shown, it further includes at least one insulating element 16, which is disposed between the busbar 12 and the grid line connection line 15.

[0091] An insulating element 16 is disposed along the thickness direction C of the cell body 13 between the grid line connecting line 15 and the busbar 12. Multiple insulating elements 16 are disposed, with one end of each insulating element 16 connected to the connector 11 and the busbar 12 arranged alternately along the second direction B. Specifically, multiple insulating elements 16 are disposed between the first grid line connecting line and the busbar 12 with one end electrically connected to the first connector 111; and multiple insulating elements 16 are disposed between the second grid line connecting line and the busbar 12 with one end electrically connected to the second connector 112 and the busbar 12 with one end alternately arranged along the second direction B.

[0092] Therefore, the insulating component 16 is provided between the busbar 12 and the grid line connection line 15 to provide electrical isolation, preventing the busbar 12, which is electrically connected to the first grid line 141, from becoming electrically connected to the second grid line 144 or the busbar 12, which is electrically connected to the second grid line 144, from becoming electrically connected to the first grid line 141, thus preventing short circuits. This improves the reliability and safety of the battery assembly and reduces the risk of short circuits and other electrical faults.

[0093] According to some embodiments of this utility model, such as Figures 9-11 As shown, the first connector 111 and / or the second connector 112 are located between the busbar 12 and the battery cell body 13, and a first clearance opening 17 is formed on the insulating member 16 for avoiding the first connector 111 and / or the second connector 112.

[0094] In some embodiments, the insulating member 16 has a plurality of clearance openings, and a plurality of first clearance openings 17 are formed on the insulating member 16. The plurality of first clearance openings 17 are spaced apart along the second direction B. One end of the first connector 111 connected to the busbar 12 is located at the first clearance opening 17. The insulating member 16 has a plurality of first clearance openings 17, and the plurality of first clearance openings 17 are spaced apart along the second direction B. One end of the second connector 112 connected to the busbar 12 is located at the first clearance opening 17.

[0095] Therefore, by setting the first clearance opening 17, the first connector 111 and the second connector 112 are electrically connected to the corresponding busbar 12, ensuring the reliability of current transmission in the battery cell assembly 100 and improving the overall performance of the battery cell assembly 100.

[0096] According to some embodiments of this utility model, such as Figures 9-11 As shown, the insulating member 16 is provided on the side surface of the battery cell body 13 facing the busbar 12; or the insulating member 16 is provided on the side surface of the busbar 12 facing the battery cell body 13.

[0097] The insulating component 16 is disposed on the side surface of the cell body 13 facing the busbar 12 or on the side surface of the busbar 12 facing the cell body 13, forming an insulating layer between the busbar 12 and the cell body 13. After lamination, the two sides of the insulating component 16 contact the cell body 13 and the busbar 12 respectively, playing an isolation role between the cell body 13 and the busbar 12, preventing electrical faults such as short circuits, and improving the electrical safety of the cell assembly 100.

[0098] According to some embodiments of this utility model, such as Figures 9-11 As shown, the first connector 111 and / or the second connector 112 are located on the side of the busbar 12 away from the battery cell body 13.

[0099] In some embodiments, one end of the first connector 111 connected to the busbar 12 is connected to the surface of the busbar 12 away from the battery cell body 13 along the thickness direction C, and the other end of the second connector 112 connected to the busbar 12 is connected to the surface of the busbar 12 away from the battery cell body 13 along the thickness direction C. An insulating member 16 is provided between the battery cell body 13 and the busbar 12.

[0100] According to some embodiments of the present invention, the insulating element 16 is a black insulating element 16.

[0101] Busbar 12, connector 11, and grid line 14 are all located on the back of the solar cell 10. The solar cell assembly 100 also includes an intermediate busbar 18, which overlaps with the adjacent ends of two adjacent solar cells 10. Insulating adhesive is placed between the solar cell 10 and the intermediate busbar 18. Thus, the insulating component 16 is black, the same color as the solar cell body 13, which improves the aesthetics of the solar cell assembly 100, making its appearance more consistent and neat.

[0102] According to a second aspect of the present invention, a battery string 200 includes: a plurality of battery cell assemblies 100, wherein the battery cell assembly 100 is the same as the battery cell assembly 100 described in the first aspect of the present invention, and the battery cells 10 of two adjacent battery cell assemblies 100 are spaced apart; or, the projections of the sides of the battery cells 10 of two adjacent battery cell assemblies 10 that are adjacent to each other along the thickness direction of the battery cells 10 at least partially overlap.

[0103] In some embodiments, such as Figure 6 As shown, two adjacent battery cells 10 of two adjacent battery cell assemblies 100 are spaced apart. The intermediate busbar 18 overlaps with the adjacent ends of the two adjacent battery cells 10. Multiple first connectors 111 on one battery cell 10 overlap with the intermediate busbar 18, and multiple first connectors 111 on the other battery cell 10 also overlap with the intermediate busbar 18; or, multiple second connectors 112 on one battery cell 10 overlap with the intermediate busbar 18, and multiple second connectors 112 on the other battery cell 10 also overlap with the intermediate busbar 18.

[0104] In some embodiments, such as Figure 7 As shown, two adjacent battery cells 10 of two adjacent battery cell assemblies 100 are spaced apart. The intermediate busbar 18 overlaps with the adjacent ends of the two adjacent battery cells 10. The first connector 111 on the two adjacent battery cells 10 is an integral structure, that is, the first connector 111 extends from the end of one battery cell 10 away from the other battery cell 10 along the first direction to the other end of the other battery cell 10 along the first direction, and the first connector 111 overlaps with the intermediate busbar 18; or, the second connector 112 on the two adjacent battery cells 10 is an integral structure, that is, the second connector 112 extends from the end of one battery cell 10 away from the other battery cell 10 along the first direction to the other end of the other battery cell 10 along the first direction, and the second connector 112 overlaps with the intermediate busbar 18.

[0105] In some embodiments, such as Figure 8As shown, the projections of the adjacent sides of the battery cells 10 of two adjacent battery cell assemblies 100 along the thickness direction of the battery cell 10 at least partially overlap, and the first connectors 111 on the two adjacent battery cells 10 are an integral structure, that is, the first connector 111 extends from one end of one battery cell 10 away from the other battery cell 10 along the first direction to the other end of the other battery cell 10 along the first direction, and the first connector 111 overlaps with the intermediate busbar 18; or, the second connectors 112 on the two adjacent battery cells 10 are an integral structure, that is, the second connector 112 extends from one end of one battery cell 10 away from the other battery cell 10 along the first direction to the other end of the other battery cell 10 along the first direction, and the second connector 112 overlaps with the intermediate busbar 18.

[0106] According to the embodiment of the present invention, by applying the battery cell assembly 100 in the above embodiment, the current collection efficiency of the battery string 200 can be effectively improved, the size of the battery string 200 can be reduced, more battery cells 10 can be arranged, the power of the battery cell assembly 100 can be increased, and the photoelectric conversion efficiency of the battery string 200 can be improved.

[0107] According to some embodiments of this utility model, such as Figure 8 As shown, the width W by which the projections of the adjacent sides of the cells 10 of two adjacent cell assemblies 100 along the thickness direction of the cell 10 overlap is satisfied: 0.2mm≤W≤0.4mm.

[0108] The cells 10 of two adjacent cell modules 100 have a certain width of overlap on the side adjacent to each other, and the overlap width is set between 0.2mm and 0.4mm. This can reduce the gap between the cells 10 and increase the effective light receiving area of ​​the cell module 100. If W is greater than 0.4mm, the overlap is too large, which will block part of the light receiving surface. In addition, too large an overlap will cause the cell module 100 to crack during the lamination process.

[0109] Therefore, by limiting the range of overlapping width of the solar cells 10, the reliability of the electrical connection between the solar cell modules 100 can be ensured, while the effective light receiving area of ​​the solar cell modules 100 can be increased, the photoelectric conversion efficiency of the solar cell modules 100 can be improved, and the risk of solar cell module 100 cracking can be reduced.

[0110] A photovoltaic module according to a third aspect of the present invention includes a cell assembly 100 according to a first aspect of the present invention, or a cell string 200 according to a second aspect of the present invention.

[0111] According to the photovoltaic module of the present invention, by applying the cell assembly 100 or cell string 200 in the above embodiments, the electrical safety of the photovoltaic module can be ensured and the overall performance and reliability of the photovoltaic module can be improved.

[0112] A photovoltaic power generation system according to a fourth aspect of the present invention includes a cell assembly 100 according to a first aspect of the present invention, a cell string 200 according to a second aspect of the present invention, or a photovoltaic module according to a third aspect of the present invention.

[0113] According to the photovoltaic power generation system of the present invention, by applying the cell module 100, cell string 200 or photovoltaic module in the above embodiments, the overall performance and reliability of the photovoltaic power generation system can be effectively improved, the structural stability and electrical connection reliability of the photovoltaic power generation system can be guaranteed, and the power generation capacity of the photovoltaic power generation system can be improved.

[0114] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0115] In the description of this utility model, "first feature" and "second feature" may include one or more of the features. In the description of this utility model, "multiple" means two or more. In the description of this utility model, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this utility model, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0116] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0117] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell assembly, characterized in that, include: At least one solar cell, the solar cell comprising a solar cell body, a plurality of grid lines and a plurality of grid line connecting lines, the grid lines comprising a plurality of first grid lines and a plurality of second grid lines with different polarities, the plurality of first grid lines and the plurality of second grid lines being alternately spaced along a first direction on at least one side surface of the solar cell body in the thickness direction; Multiple connectors, the multiple connectors including multiple first connectors and multiple second connectors, the multiple first connectors being electrically connected to multiple first grid lines respectively, the multiple second connectors being electrically connected to multiple second grid lines respectively, and the grid line connecting lines being electrically connected to the second connectors and / or the first connectors; At least one busbar is provided at the end of the cell body along a first direction and on one side of the cell body in the thickness direction. The busbar is electrically connected to the first connector and / or the second connector, and is insulated from the second connector and / or the first connector. The busbar is also insulated from the grid line connection.

2. The battery cell assembly according to claim 1, characterized in that, Each first grid line includes a plurality of first grid line segments, with adjacent two first grid line segments spaced apart to define a first opening. The first openings of the plurality of first grid lines are opposite to each other along a first direction. Each second grid line includes a plurality of second grid line segments, with adjacent two second grid line segments spaced apart to define a second opening. The second openings of the plurality of second grid lines are opposite to each other along a first direction. The first opening and the second opening are staggered along a first direction. A plurality of grid line connecting lines are provided at the end of the cell body along the first direction. The grid line connecting lines are located at the first opening and / or the second opening. The grid line connecting lines connect at least two second grid line segments and / or at least two first grid line segments. A plurality of first connectors are respectively disposed at a plurality of second openings, and the plurality of first connectors are respectively electrically connected to a plurality of first grid lines; a plurality of second connectors are respectively disposed at a plurality of first openings, and the plurality of second connectors are respectively electrically connected to a plurality of second grid lines. One end of the grid line connecting line is connected to the nearest one of at least two second grid line segments and / or at least two first grid line segments to the center of the cell body. The other end of the grid line connecting line is sequentially connected to the second grid line segment and / or the first grid line segment facing the edge of the cell body, and extends to the first opening of the first grid line and / or the second opening of the second grid line adjacent to the edge of the cell body.

3. The battery cell assembly according to claim 1, characterized in that, The number of the multiple gate lines connected by the gate line connection line is N, where N satisfies: 5≤N≤30.

4. The battery cell assembly according to claim 1, characterized in that, The second connector and / or the first connector covers a portion of the grid line connection, and the second connector and / or the first connector are spaced apart from the busbar to insulate them from the busbar.

5. The battery cell assembly according to claim 4, characterized in that, The length of the grid line covered by the second connector and / or the first connector is at least the distance between two adjacent second grid lines and / or two adjacent first grid lines.

6. The battery cell assembly according to claim 4, characterized in that, The second connector and / or the first connector cover the length of the grid line connection line L1, where L1 satisfies: 0 < L1 ≤ 5 mm.

7. The battery cell assembly according to claim 1, characterized in that, The length of the grid line connecting line in the first direction is less than or equal to the minimum distance between the end of the second connector and / or the first connector and the corresponding edge of the battery cell body.

8. The battery cell assembly according to claim 1, characterized in that, The length of the grid line connecting line in the first direction is greater than the width of the busbar in the first direction.

9. The battery cell assembly according to claim 1, characterized in that, The width of the grid line connecting line in the second direction is less than the maximum width of the connector in the second direction, and the second direction is perpendicular to the first direction.

10. The battery cell assembly according to claim 1, characterized in that, The width of the grid line connecting line in the second direction is greater than the maximum width of the grid line in the first direction, and the second direction is perpendicular to the first direction.

11. The battery cell assembly according to claim 1, characterized in that, The width of the grid line connecting line in the second direction is L2, and L2 satisfies: 0 < L2 ≤ 0.5 mm.

12. The battery cell assembly according to claim 2, characterized in that, The first gate segment includes a first thickened portion, which is opposite to the second opening, and the first connector is connected to the first thickened portion; The second gate segment includes a second thickened portion, which is opposite to the first opening, and the second connector is connected to the second thickened portion. The grid line connection connects at least one of the second thickened portions and / or at least one of the first thickened portions.

13. The battery cell assembly according to claim 12, characterized in that, The width of the grid line connecting line in the second direction is smaller than the width of the first thickened portion in the first direction, and the second direction is perpendicular to the first direction.

14. The battery cell assembly according to claim 12, characterized in that, The length of the first thickened portion in the second direction is greater than the width of the first connector in the first direction; The length of the second thickened portion in the second direction is greater than the width of the second connector in the first direction, and the second direction is perpendicular to the first direction.

15. The solar cell assembly according to any one of claims 1-14, characterized in that, Further includes: At least one insulating element is disposed between the busbar and the grid line connection.

16. The battery cell assembly according to claim 15, characterized in that, The first connector and / or the second connector are located between the busbar and the battery cell body. The insulating member has a first clearance opening formed on it for avoiding the first connector and / or the second connector.

17. The battery cell assembly according to claim 16, characterized in that, The insulating element is disposed on the surface of the battery cell body facing the busbar; or The insulating element is disposed on the side surface of the busbar facing the battery cell body.

18. The battery cell assembly according to claim 15, characterized in that, The first connector and / or the second connector are located on the side of the busbar away from the battery cell body.

19. The battery cell assembly according to claim 15, characterized in that, The insulating component is a black insulating component.

20. A battery string, characterized in that, include: Multiple solar cell modules, wherein the solar cell modules are solar cell modules according to any one of claims 1-19, and the solar cells of two adjacent solar cell modules are spaced apart; or, The projections of the adjacent sides of the cells in two adjacent cell assemblies along the thickness direction of the cells at least partially overlap.

21. The battery string according to claim 20, characterized in that, The width W by which the projections of the adjacent sides of the cells of two adjacent cell assemblies overlap along the thickness direction of the cells is 0.2mm≤W≤0.4mm.

22. A photovoltaic module, characterized in that, Includes a cell assembly according to any one of claims 1-19, or a cell string according to claim 20 or 21.

23. A photovoltaic power generation system, characterized in that, Includes a solar cell assembly according to any one of claims 1-19, or a solar cell string according to claim 20 or 21, or a photovoltaic module according to claim 22.

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