Back contact battery assembly and photovoltaic system

Abstract

The utility model is suitable for the technical field of solar cells, and provides a back contact cell module and a photovoltaic system, the back contact cell module comprises a cell sheet, a conductive wire, a first confluence structure and a second confluence structure, and first grid lines and second grid lines extend along a first direction and are alternately distributed along a second direction, the first grid lines and the second grid lines are opposite in polarity, the conductive wires comprise the first conductive wires and the second conductive wires, the first conductive wires cover and are connected with the first grid lines, the second conductive wires cover and are connected with the second grid lines, the first confluence structures extend in the second direction, and the first conductive wires are connected with the first confluence structures. The second confluence structure extends in the second direction, and the second conductive wire is connected with the second confluence structure. Therefore, the conductive wire can be matched with the grid line to collect the current generated by the battery piece, more leading-out ways are provided for the current, and the collection effect of the current on the battery piece is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of solar cells, and in particular to a back-contact cell assembly and a photovoltaic system. Background Art

[0002] At present, solar cells are semiconductor devices that convert sunlight energy directly into electrical energy. Solar cells use the photovoltaic effect to excite electrons by absorbing photons, and conduct these electrons to generate current through a built-in electric field. Back-contact cells refer to solar cells with no electrodes on the light-facing side of the cell, and both the positive and negative electrodes are arranged on the back-light side of the cell. This can reduce the shading of the cell by the electrodes, increase the short-circuit current of the cell, and improve the energy conversion efficiency of the cell. However, in existing back-contact cells, there are more fine grid losses and / or main grid losses, and the cold welding of the welding strip will cause further current loss. At the same time, the grid line has limited effect on current collection and carrying. In order to improve its carrying capacity, the silver paste / metallization process materials will increase, which increases the cost. Utility Model Content

[0003] The present application provides a back-contact cell assembly and a photovoltaic system, aiming to solve the problem of poor collection effect of photovoltaic cells during use.

[0004] The present application provides a back contact battery assembly, comprising:

[0005] A battery cell, wherein the battery cell has a front side and a back side facing each other, the back side is provided with a first grid line and a second grid line, the first grid line and the second grid line extend along the first direction and are alternately distributed along the second direction, wherein the first grid line and the second grid line have opposite polarities, and the first direction and the second direction intersect;

[0006] Conductive lines, including first conductive lines and second conductive lines, the first conductive lines and the second conductive lines extend along the first direction and are alternately distributed along the second direction, the first conductive lines cover and connect the first gate lines, and the second conductive lines cover and connect the second gate lines;

[0007] a first bus structure, the first bus structure extending along the second direction, the first conductive line at least partially connecting the first bus structure;

[0008] A second bus structure is provided, wherein the second bus structure is extended along the second direction, and the second conductive line is at least partially connected to the second bus structure.

[0009] Further, the first busbar structure and the second busbar structure are disposed on two side edges of the back surface of the same cell. The polarities of the first busbar structure and the second busbar structure are opposite, and the first busbar structure of the cell is electrically connected to the second busbar structure of an adjacent cell.

[0010] Further, the back contact cell assembly further includes a third busbar structure, and the third busbar structure electrically connects the first busbar structure of the cell and the second busbar structure of an adjacent cell; or

[0011] The first busbar structure of the cell and the second busbar structure of an adjacent cell are at least partially overlapped and disposed together.

[0012] Further, the back contact cell assembly further includes a connection structure, and the connection structure includes a first connection structure and a second connection structure. The first connection structure is used to connect the first grid line and the first busbar structure, and the second connection structure is used to connect the second grid line and the second busbar structure.

[0013] Further, in the first direction, the width of the connection structure is gradually changed, and the connection structure is wider near the first busbar structure and the second busbar structure.

[0014] Further, the first connection structure is in a triangular or trapezoidal shape; and / or

[0015] The second connection structure is in a triangular or trapezoidal shape.

[0016] Further, in the second direction, the first grid lines are equally spaced and / or non-equally spaced between the second grid lines.

[0017] Further, in the first direction, the first grid lines are equally spaced and / or non-equally spaced from the second busbar structure, and the second grid lines are equally spaced and / or non-equally spaced from the first busbar structure.

[0018] Further, the widths of the first busbar structure and the second busbar structure in the first direction are 0.05 - 0.5 mm.

[0019] Further, relief grooves are formed on one side of the first busbar structure and the second busbar structure close to the conductive wire. At least a part of the first grid line extends into the relief groove of the second busbar structure, and at least a part of the second grid line extends into the relief groove of the first busbar structure.

[0020] Further, the first busbar structure includes a plurality of first sub-busbar structures arranged along the second direction, and at least one of the second grid lines extends between two adjacent first sub-busbar structures;

[0021] The second busbar structure includes a plurality of second sub-busbar structures arranged along the second direction, and at least one of the first grid lines extends between two adjacent second sub-busbar structures.

[0022] Further, the first sub-busbar structure and the second sub-busbar structure both form avoidance grooves on the side close to the conductive wire. At least a part of the first grid line extends into the avoidance groove of the second sub-busbar structure, and at least a part of the second grid line extends into the avoidance groove of the first sub-busbar structure.

[0023] Further, the conductive wire is a metal wire.

[0024] Further, the first grid line is intermittently arranged; and / or

[0025] The second grid line is intermittently arranged.

[0026] Further, the conductive wire forms an arch structure at the intermittent positions of the first grid line and the second grid line.

[0027] Further, the first busbar structure and the second busbar structure are in contact and arranged on the back surface of the battery cell; or

[0028] The first busbar structure and the second busbar structure are non-contact and arranged on the back surface of the battery cell and connected to the ends of the conductive wire.

[0029] The photovoltaic system provided by the embodiment of the present application includes the back-contact battery module as described in any one of the above embodiments.

[0030] In the back-contact battery module and the photovoltaic system according to the embodiments of the present application, the back-contact battery module includes a battery cell, a conductive wire, a first busbar structure, and a second busbar structure. The battery cell has a front side and a back side facing away from each other, and the back side is provided with a first grid line and a second grid line. The first grid line and the second grid line extend along a first direction and are alternately distributed along a second direction. Among them, the first grid line and the second grid line have opposite polarities, and the first direction intersects the second direction. The conductive wire includes a first conductive wire and a second conductive wire. The first conductive wire and the second conductive wire extend along the first direction and are alternately distributed along the second direction. The first conductive wire covers and connects the first grid line, and the second conductive wire covers and connects the second grid line. The first busbar structure extends along the second direction, and at least part of the first conductive wire is connected to the first busbar structure. The second busbar structure extends along the second direction, and at least part of the second conductive wire is connected to the second busbar structure. In this way, the conductive wire can cooperate with the grid line to provide more current extraction paths, improve the current collection effect on the battery cell. In the case of broken grid, hidden crack, etc., the first busbar structure and the second busbar structure can export the current through the conductive wire, thereby ensuring stable current collection. At the same time, since the conductive wire assists in carrying the current collection and transmission, the production cost brought by the silver paste / metalization process materials and equipment of the battery cell can be further reduced. Description of the Drawings

[0031] Figure 1 is a partial planar structure schematic diagram of a back-contact battery module according to an embodiment of the present application;

[0032] Figure 2 is another partial planar structure schematic diagram of a back-contact battery module according to an embodiment of the present application;

[0033] Figure 3 is yet another partial planar structure schematic diagram of a back-contact battery module according to an embodiment of the present application;

[0034] Figure 4 is still another partial planar structure schematic diagram of a back-contact battery module according to an embodiment of the present application;

[0035] Figure 5 is still another partial planar structure schematic diagram of a back-contact battery module according to an embodiment of the present application;

[0036] Figure 6 is still another partial planar structure schematic diagram of a back-contact battery module according to an embodiment of the present application;

[0037] Figure 7 is a partial cross-sectional structure schematic diagram of a back-contact battery module according to an embodiment of the present application;

[0038] Figure 8 is a structure schematic diagram of a photovoltaic system according to an embodiment of the present application.

[0039] Description of Main Component Symbols:

[0040] Back-contact battery assembly 100, battery cell 10, front side 11, back side 12, first grid line 121, second grid line 122, conductive wire 20, first conductive wire 21, second conductive wire 22, arching structure 23, first busbar structure 30, first sub-busbar structure 31, avoidance groove 32, second busbar structure 40, second sub-busbar structure 41, third busbar structure 50, connection structure 60, first connection structure 61, second connection structure 62, photovoltaic system 200. Detailed Implementation Manner

[0041] In order to make the objectives, technical solutions and advantages of this application clearer, the following further elaborates on this application in conjunction with the accompanying drawings and embodiments. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as a limitation to this application. In addition, it should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0042] In the description of this application, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc. are based on the orientation or positional relationships shown in the accompanying drawings. These are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "a plurality" means two or more unless otherwise specifically defined.

[0044] In the description of this application, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0046] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure of this application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit this application. In addition, this application may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and in itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use scenarios of other materials.

[0047] In the related art, a solar cell is a semiconductor device that directly converts the energy of sunlight into electrical energy. A solar cell utilizes the photovoltaic effect to excite electrons by absorbing photons and exports these electrons through a built-in electric field to generate current. A back-contact cell refers to a solar cell in which the light-facing surface of the cell wafer has no electrodes, and the positive and negative electrodes are both disposed on the backlight side of the cell wafer, which can reduce the shielding of the electrodes on the cell wafer, increase the short-circuit current of the cell wafer, and improve the energy conversion efficiency of the cell wafer. However, in existing back-contact cells, there will be current loss caused by poor soldering of the solder tape, and at the same time, it is difficult for the grid lines to cover the entire cell wafer, resulting in poor current collection effect. In this application, the first conductive wire can cover and connect the first grid line, the second conductive wire can cover and connect the second grid line, and at the same time, the first current collecting structure and the second current collecting structure can export the current of the conductive wire. The conductive wire cooperates with the grid line to provide more ways to lead out the current, improve the current collection effect on the cell wafer. In the case of broken grids, hidden cracks, etc., the first current collecting structure and the second current collecting structure can export the current through the conductive wire, thereby ensuring stable current collection. At the same time, since the solder tape assists in carrying the current collection and transmission, the production cost brought by the silver paste / metallization process materials and equipment of the cell wafer can be further reduced.

[0048] Embodiment 1

[0049] Please refer to Figure 1 、 Figure 2 and Figure 3, a back-contact battery module 100 provided by the present application includes a battery cell 10, a conductive wire 20, a first busbar structure 30, and a second busbar structure 40. The battery cell 10 has opposite front and back surfaces 11 and 12. The back surface 12 is provided with a first grid line 121 and a second grid line 122. The first grid line 121 and the second grid line 122 extend along a first direction and are alternately distributed along a second direction. Among them, the first grid line 121 and the second grid line 122 have opposite polarities, and the first direction and the second direction intersect. The conductive wire 20 includes a first conductive wire 21 and a second conductive wire 22. The first conductive wire 21 and the second conductive wire 22 extend along the first direction and are alternately distributed along the second direction. The first conductive wire 21 covers and connects the first grid line 121, and the second conductive wire 22 covers and connects the second grid line 122. The first busbar structure 30 is arranged to extend along the second direction, and the first conductive wire 21 is at least partially connected to the first busbar structure 30. The second busbar structure 40 is arranged to extend along the second direction, and the second conductive wire 22 is at least partially connected to the second busbar structure 40.

[0050] In an embodiment of the present application, two regions with opposite polarities can be formed on the back surface 12 of the battery cell 10. The first grid line 121 can be arranged in the first electrode region, and the second grid line 122 can be arranged in the second electrode region. That is to say, the first grid line 121 and the second grid line 122 can lead out the current generated by the battery cell 10. At the same time, the first conductive wire 21 is arranged on the first grid line 121, and the second conductive wire 22 is arranged on the second grid line 122. The first conductive wire 21 and the second conductive wire 22 are also conductive wires 20 with opposite polarities. In addition, the first busbar structure 30 connects multiple first conductive wires 21 to converge the current of the first conductive wires 21, and the second busbar structure 40 connects multiple second conductive wires 22 to converge the current of the second conductive wires 22. Finally, the current is led out through the busbar structure.

[0051] Specifically, in the embodiment of the present application, the back-contact battery assembly 100 may include a plurality of battery cells 10. The plurality of battery cells 10 may be arranged along a first direction to form a battery string, thereby realizing the series connection and output of current. The extending directions of the grid lines and the conductive wires 20 are also the first direction. In this way, the current can flow from the battery cells 10 to the grid lines and the conductive wires 20 and then to the current collecting structure, reducing the fine grid loss and / or the main grid loss, and thus improving the power of the assembly. At the same time, the ends of the first conductive wire 21 and the second conductive wire 22 may be respectively connected to the first current collecting structure 30 and the second current collecting structure 40, so that the first current collecting structure 30 and the second current collecting structure 40 can be respectively arranged on both sides of the battery cells 10 in the first direction. In this way, the back-contact battery assembly 100 can achieve a more compact and efficient layout, not only increasing the current extraction paths, improving the current collection and transmission efficiency, but also improving the load performance of the battery cells 10 and the assembly. The reasonable layout and connection of the first conductive wire 21 and the second conductive wire 22 ensure the effective conduction of the current and reduce the power loss. In addition, arranging the first current collecting structure 30 and the second current collecting structure 40 on both sides of the battery cells 10 in the first direction helps to reduce the electrical loss during inter-cell series connection and further improves the power of the assembly.

[0052] In this embodiment, the grid lines and the conductive wires 20 are connected to each other to form a continuous current transmission path. The first conductive wire 21 is connected to the first grid line 121 and extends to the edge of the battery cell 10 to be connected to the first current collecting structure 30. Similarly, the second conductive wire 22 is connected to the second grid line 122 and extends to the opposite edge to be connected to the second current collecting structure 40. In this way, it is ensured that the current generated by each battery cell 10 can be collected and transmitted quickly and efficiently through multiple paths.

[0053] In addition, insulating materials may be provided between adjacent grid lines of the battery cells 10 and at the ends of the different-sex grid lines at the edge of the current collecting structure to prevent the short circuit of the different-sex electrodes, and an insulating layer may be provided between the current collecting structure and the battery cells 10 to improve the durability and safety of the overall assembly. The back-contact battery assembly 100 provided by the present application realizes the goals of high space utilization rate, high current transmission efficiency through multiple paths and high reliability through the reasonable arrangement of the battery cells 10, the layout of the grid lines and the conductive wires 20, and the setting of the current collecting structure, and is applicable to various high-performance battery application scenarios.

[0054] Furthermore, the back-contact battery assembly 100 provided by the present application can improve the electrical conductivity and efficiency of the battery cell 10. The alternating distribution of the first grid line 121 and the second grid line 122 and their precise connection with the conductive line 20 enable the current to be collected and transmitted more effectively, reducing the electrical losses of the fine grid and / or the main grid. At the same time, the reasonable setting of the current collecting structure ensures the reliable connection of the conductive line 20, enhancing the stability and reliability of the overall structure. In this way, a more efficient current collection and transmission path is provided in the back-contact battery assembly 100, making the back-contact battery assembly 100 have lower electrical losses, production costs, and higher power in practical applications.

[0055] Furthermore, the number of conductive lines 20 and grid lines provided on the back surface 12 is the same, which is equivalent to providing a fine metal load-bearing film layer on the back surface 12 of the battery cell 10, improving the load-bearing performance of the battery cell 10 and the assembly, as well as providing more current extraction paths. In this way, the conductive line 20 can cooperate with the grid line to provide more current extraction paths, improving the current collection effect on the battery cell 10. In the case of broken grids, hidden cracks, etc., the first current collecting structure 30 and the second current collecting structure 40 can export the current through the conductive line 20, thereby ensuring stable current collection. At the same time, since the conductive line 20 assists in carrying the current collection and transmission, the production costs brought by the silver paste / metallization process materials and equipment of the battery cell 10 can be further reduced.

[0056] Exemplarily, the first grid line 121 of the back-contact battery assembly 100 can be the positive electrode, and the second grid line 122 can be the negative electrode. In other embodiments, it can be the opposite, and specific details are not limited herein.

[0057] In addition, in the embodiments of the present application, the form of the conductive line 20 is not limited either to meet different requirements. For example, the cross-sectional shape of the conductive line 20 can be circular, triangular, quasi-triangular, or rectangular. Of course, the cross-sectional shapes of the first conductive line 21 and the second conductive line 22 can be the same or different, and the cross-section of a single conductive wire can also be different. When it is planar, it can ensure a more secure and better welding effect.

[0058] Embodiment 2

[0059] Please refer to Figure 1 and Figure 2 , in some alternative embodiments, the first current collecting structure 30 and the second current collecting structure 40 are provided on both side edges of the back surface 12 of the same battery cell 10. The polarities of the first current collecting structure 30 and the second current collecting structure 40 are opposite, and the first current collecting structure 30 of the battery cell 10 is electrically connected to the second current collecting structure 40 of the adjacent battery cell 10.

[0060] In this way, the first busbar structure 30 and the second busbar structure 40 can be directly disposed on the back surface 12 of the cell 10, facilitating the direct connection of the conductive wire 20. Meanwhile, during the manufacturing process, a single cell 10 of the present application is often formed by cutting a larger cell. Therefore, busbar structures can be disposed in the middle and at the edges of the larger cell, and then the cell is cut into two cells 10. At this time, the first busbar structure 30 and the second busbar structure 40 are respectively formed at the edges of the two cells 10, and the manufacturing process is more convenient.

[0061] Specifically, the first busbar structure 30 and the second busbar structure 40 are disposed at the two side edges of the back surface 12 of the same cell 10, and the two have opposite polarities. The first busbar structure 30 of each cell 10 is electrically connected to the second busbar structure 40 of an adjacent cell 10, thereby forming a continuous current transmission path.

[0062] Exemplarily, during the manufacturing process, a single cell 10 in the present application is usually formed by cutting a larger cell. Therefore, busbar structures can be preset in the middle and at the edges of the larger cell, and then the cell is cut into two cells 10. In this way, the edges of each newly formed cell 10 will respectively carry the first busbar structure 30 and the second busbar structure 40, greatly simplifying the manufacturing process. In this way, not only the production efficiency is improved, but also the position of the busbar structure is accurately ensured, ensuring the high efficiency and stability of current transmission. In addition, since the busbar structure is disposed at the edge of the cell 10, the battery modules can be arranged more compactly during assembly, further improving the space utilization rate and the overall performance of the module. The back-contact battery module 100 of the present application exhibits higher reliability and efficiency in practical applications and is suitable for the requirements of various high-performance battery systems.

[0063] Embodiment III

[0064] Please refer to Figure 1 and Figure 2 In some alternative embodiments, the back-contact battery module 100 further includes a third busbar structure 50, and the third busbar structure 50 is electrically connected to the first busbar structure 30 of the cell 10 and electrically connected to the second busbar structure 40 of an adjacent cell 10; or

[0065] The first busbar structure 30 of the cell 10 and the second busbar structure 40 of an adjacent cell 10 are at least partially overlapped and disposed together.

[0066] Thus, the third current collecting structure 50 can be used to electrically connect the first current collecting structure 30 of the battery cell 10 and the second current collecting structure 40 of the adjacent battery cell 10 to ensure the formation of a stable current conduction path and the stability of the back-contact battery module 100. Additionally, it can also be directly arranging at least partially overlapping the first current collecting structure 30 of the battery cell 10 and the second current collecting structure 40 of the adjacent battery cell 10 together, so that the first current collecting structure 30 and the second current collecting structure 40 of the adjacent battery cell 10 are in contact connection to ensure the stability of the back-contact battery module 100.

[0067] Specifically, by introducing the third current collecting structure 50 or adopting the overlapping arrangement method of the current collecting structure, not only the manufacturing process is simplified, but also the continuity and stability of current conduction are ensured. The setting of the third current collecting structure 50 can effectively connect the current collecting structures of adjacent battery cells 10 to form a stable and reliable current conduction path. At the same time, the overlapping arrangement makes the direct contact between the current collecting structures closer, further improving the firmness of the connection and the current transmission efficiency, enabling the back-contact battery module 100 to have a larger light-receiving area, reducing the non-battery area, making more reasonable use of space, having a high space utilization rate, and improving the module conversion rate.

[0068] In the embodiment of the present application, the form of the third current collecting structure 50 is not limited to meet different requirements. For example, the third current collecting structure 50 can be a conductive material such as a wire, a bus bar, or a conductive tape.

[0069] In this embodiment, the shape of the battery cell 10 is not limited to meet different requirements. For example, the battery cell 10 can be a rectangle or a square whole-piece battery with cutting channels. Then, the square whole-piece battery is designed to correspond to a single rectangular battery cell 10 or a single battery cell 10 segment (two segments, three segments, etc.) after cutting. The main feature of such a battery cell 10 is that there are no any grid lines and electrode structures on the front surface 11, and the positive and negative electrode structures are alternately distributed on the back surface 12 of the battery cell 10 in turn.

[0070] Additionally, in the embodiment of the present application, the number and each dimension range of the first grid line 121 and the second grid line 122 are not limited to meet different requirements. For example, when the width of the battery cell 10 is less than or equal to 210 mm, the number of the first grid line 121 and the second grid line 122 can be 100 - 800, the spacing between the first grid line 121 and the second grid line 122 is 0.2 - 2 mm, and the width of the first grid line 121 and the second grid line 122 in the second direction can be 10 - 300 μm.

[0071] Embodiment Four

[0072] Please refer to Figure 3, in some alternative embodiments, the back-contact battery assembly 100 further includes a connection structure 60. The connection structure 60 includes a first connection structure 61 and a second connection structure 62. The first connection structure 61 is used to connect the first grid line 121 and the first busbar structure 30, and the second connection structure 62 is used to connect the second grid line 122 and the second busbar structure 40.

[0073] In this way, the connection structure 60 can make the connection between the busbar structure and the grid line more stable, avoiding the disconnection between the end of the grid line and the busbar structure, resulting in current loss.

[0074] Specifically, the connection structure 60 can make the connection between the busbar structure and the grid line more stable, avoiding the disconnection between the end of the grid line and the busbar structure, thereby reducing current loss and ensuring the reliability and efficiency of current transmission. The precise setting of the first connection structure 61 and the second connection structure 62 makes the current conduction path inside the battery cell 10 more secure, avoiding electrical connection instability problems caused by physical stress or manufacturing deviations. In addition, the connection structure 60 can further optimize the manufacturing process of the battery cell 10. The precise position and shape of the first connection structure 61 and the second connection structure 62 can be adjusted according to specific requirements to adapt to different battery cell 10 sizes and layouts, thereby improving production flexibility, yield, and efficiency. At the same time, the material selection and manufacturing process of the connection structure 60 can also be optimized according to the specific application environment to improve its durability and conductivity.

[0075] Embodiment Five

[0076] Please refer to Figure 3 , in some alternative embodiments, in the first direction, the width of the connection structure 60 gradually changes, and the width of the connection structure 60 near the first busbar structure 30 and the second busbar structure 40 is wider.

[0077] In this way, the closer to the busbar structure, the wider the connection structure 60 is in the second direction. In this way, the connection structure 60 can be made more stable, avoiding the problem of open circuit.

[0078] Specifically, as the connection structure 60 gradually widens, it can provide a larger contact area and stronger mechanical support, reducing the risk of broken grid caused by printing, physical stress, temperature change, or other environmental factors. Exemplarily, the width of the connection structure 60 can be linearly tapered or non-linearly tapered, depending on the required stability and the feasibility of the manufacturing process.

[0079] In some embodiments, the conductive wire 20 and the grid line can be connected to the busbar structure through the connection structure 60 at the same time, ensuring stable connection, ensuring uniform distribution of current during transmission, and avoiding local overheating or excessive resistance.

[0080] In some other embodiments, the connection structure 60 may be a part of a busbar structure or a gate line. That is, the connection structure 60 can be fabricated when fabricating the busbar structure, or the connection structure 60 can be fabricated when fabricating the gate line. At this time, the material of the connection structure 60 is the same as that of the busbar structure or the gate line, only the morphology changes.

[0081] In addition, in the embodiments of the present application, the material and shape of the connection structure 60 are not limited to meet different requirements. For example, the connection structure 60 can be a metal such as copper or silver.

[0082] Embodiment Six

[0083] Please refer to Figure 3 , in some alternative embodiments, the first connection structure 61 is triangular or trapezoidal; and / or

[0084] the second connection structure 62 is triangular or trapezoidal.

[0085] Specifically, the morphologies of the first connection structure 61 and the second connection structure 62 can be different or the same. The end with a smaller cross-sectional area of the first connection structure 61 and the second connection structure 62 needs to be connected to the gate line. That is, the connection structure 60 connects to the gate line at the position where it is narrower in the second direction, and the connection structure 60 connects to the busbar structure at the position where it is wider in the second direction.

[0086] Embodiment Seven

[0087] Please refer to Figure 1 and Figure 2 , in some alternative embodiments, in the second direction, the first gate line 121 and the second gate line 122 are arranged at equal intervals and / or non-equal intervals.

[0088] In this way, the first gate line 121 and the second gate line 122 can be arranged at equal intervals, or non-equal intervals, or partially at equal intervals and partially at non-equal intervals. In this way, corresponding adjustments can be made according to actual needs.

[0089] Specifically, the spacing between the first gate line 121 and the second gate line 122 is flexibly adjusted according to actual needs. Arranging at equal intervals can ensure uniform current distribution and improve the overall efficiency of the back-contact battery module 100; arranging at non-equal intervals can optimize the current conduction path for specific application scenarios and reduce problems such as local overheating or excessive resistance. The combined setting of partially equal intervals and partially non-equal intervals can combine the advantages of both and be flexibly adjusted according to specific needs to optimize the performance of the back-contact battery module 100.

[0090] Furthermore, equidistant setting is relatively simple in the manufacturing process and suitable for large-scale production. Non-equidistant setting is optimized in certain areas of the cell 10 according to the current density and heat distribution, reducing local hot spots and excessive resistance problems. It is applicable to application scenarios that require special current distribution or thermal management, such as high-power battery modules. By combining the advantages of equidistant and non-equidistant settings and flexibly adjusting according to specific requirements, the overall performance of the battery module can be optimized.

[0091] Embodiment VIII

[0092] Please refer to Figure 1 and Figure 2 , in some alternative embodiments, in the first direction, the first grid lines 121 are all arranged equidistantly and / or non-equidistantly with the second busbar structure 40, and the second grid lines 122 are all arranged equidistantly and / or non-equidistantly with the first busbar structure 30.

[0093] In this way, equidistant setting is suitable for large-scale production, and non-equidistant setting is applicable to the deployment of certain areas.

[0094] Specifically, this design provides a high degree of flexibility, enabling the distance between the grid lines and the busbar structure to be adjusted according to specific requirements. Equidistant setting is suitable for large-scale production, ensuring the simplicity and consistency of the manufacturing process; non-equidistant setting is applicable to the optimization of specific areas, helping to improve current distribution and thermal management, thereby enhancing the overall performance of the battery module. For example, in some positions where the process is difficult to implement, the distance between the grid lines and the busbar structure can be appropriately increased to avoid short-circuit problems caused by process errors.

[0095] Embodiment IX

[0096] Please refer to Figure 1 and Figure 2 , in some alternative embodiments, the widths of the first busbar structure 30 and the second busbar structure 40 in the first direction are 0.05 - 0.5 mm. For example, the widths of the first busbar structure 30 and the second busbar structure 40 in the first direction can be 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm.

[0097] In this way, by setting the widths of the first busbar structure 30 and the second busbar structure 40 in the first direction within this range, the conductive wires 20 and the grid lines can be effectively connected while avoiding affecting the grid lines' current collection.

[0098] Specifically, this design of the width setting range enables the first busbar structure 30 and the second busbar structure 40 to provide effective connection of the conductive wires 20 without affecting the current collection of the gate lines. By optimizing the width, both the connection stability of the busbar structure can be ensured, and the impact on the current collection efficiency can be minimized. When the width of the busbar structure is relatively narrow, it is suitable for high-density circuit designs, ensuring minimal occupied space and improving the integration of components. When the width of the busbar structure is relatively wide, it can provide higher conductivity and mechanical stability, and is suitable for application scenarios that require higher current-carrying capacity.

[0099] Embodiment Ten

[0100] Please refer to Figure 4 , in some alternative embodiments, the first busbar structure 30 and the second busbar structure 40 are both formed with avoidance grooves 32 on the side close to the conductive wires 20. At least a part of the first gate line 121 extends into the avoidance groove 32 of the second busbar structure 40, and at least a part of the second gate line 122 extends into the avoidance groove 32 of the first busbar structure 30.

[0101] In this way, the first gate line 121 is connected to the first busbar structure 30 through the first conductive wire 21. At the same time, the second busbar structure 40 is formed with an avoidance groove 32, so that the ends of the first gate line 121 and the first conductive wire 21 can extend into the avoidance groove 32, maximizing the current collection area as much as possible. Similarly, the second gate line 122 is connected to the second busbar structure 40 through the second conductive wire 22. At the same time, the first busbar structure 30 is formed with an avoidance groove 32, so that the ends of the second gate line 122 and the second conductive wire 22 can extend into the avoidance groove 32, maximizing the current collection area as much as possible.

[0102] Specifically, in this embodiment, the first busbar structure 30 and the second busbar structure 40 extend in a strip shape along the second direction, and the avoidance groove 32 retracts along the first direction relative to the surfaces of the first busbar structure 30 and the second busbar structure 40. At the same time, the avoidance groove 32 of the first busbar structure 30 and the avoidance groove 32 of the second busbar structure 40 are staggered with each other to ensure that the first gate line 121 and the second gate line 122 can respectively extend into the avoidance groove 32 on the opposite side. The first busbar structure 30 and the second busbar structure 40 are provided with avoidance grooves 32 on the side close to the conductive wires 20, and the first gate line 121 and the second gate line 122 respectively extend into the corresponding avoidance grooves 32. This design maximizes the current collection area and enhances the stability and efficiency of the electrical connection. Through precise design of the avoidance grooves 32, high-quality material selection, and precise manufacturing processes, the battery module can achieve optimal performance and high reliability in various application scenarios.

[0103] In addition, the first busbar structure 30 and the second busbar structure 40 can be of any shape to meet different requirements. The first busbar structure 30 and the second busbar structure 40 have low requirements for inter-chip welding and positioning accuracy and good compatibility.

[0104] Embodiment XI

[0105] Please refer to Figure 5 , in some alternative embodiments, the first busbar structure 30 includes a plurality of first sub-busbar structures 31 arranged along the second direction, and at least one second grid line 122 extends between two adjacent first sub-busbar structures 31;

[0106] The second busbar structure 40 includes a plurality of second sub-busbar structures 41 arranged along the second direction, and at least one first grid line 121 extends between two adjacent second sub-busbar structures 41.

[0107] In this way, both the first busbar structure 30 and the second busbar structure 40 are divided into blocks, and the gaps between adjacent sub-busbar structures can be used to extend the grid lines to further increase the current collection area.

[0108] Specifically, the first busbar structure 30 and the second busbar structure 40 are divided into multiple block-shaped sub-busbar structures. The gaps between adjacent sub-busbar structures are specifically used to accommodate the extended grid lines, thereby significantly increasing the current collection area. In this way, the gaps between the busbar structure and the grid lines can be effectively utilized to maximize the current collection efficiency and overall performance of the battery module.

[0109] Embodiment XII

[0110] Please refer to Figure 5 and Figure 6 , in some alternative embodiments, a relief groove 32 is formed on one side of each of the first sub-busbar structure 31 and the second sub-busbar structure 41 close to the conductive wire 20. At least a part of the first grid line 121 extends into the relief groove 32 of the second sub-busbar structure 41, and at least a part of the second grid line 122 extends into the relief groove 32 of the first sub-busbar structure 31.

[0111] In this way, part of the first grid line 121 and the end of the first conductive wire 21 can extend into the relief groove 32, and part of the first grid line 121 and the end of the first conductive wire 21 can also extend between two adjacent second sub-busbar structures 41 to maximize the current collection area as much as possible. Similarly, part of the second grid line 122 and the end of the second conductive wire 22 can extend into the relief groove 32, and part of the second grid line 122 and the end of the second conductive wire 22 can also extend between two adjacent first sub-busbar structures 31 to maximize the current collection area as much as possible.

[0112] Of course, in such an embodiment, the first sub-busbar structures 31 can be electrically connected together in other ways, and the second sub-busbar structures 41 can also be electrically connected together in other ways. The specific ways are not limited herein.

[0113] Furthermore, the spacing between adjacent first sub-busbar structures 31 and the spacing between adjacent second sub-busbar structures 41 are not limited, and the dimensions of the first sub-busbar structures 31 and the second sub-busbar structures 41 themselves are not limited either, so as to meet different requirements. For example, the length of the first sub-busbar structure 31 in the second direction can correspond to the number of same-polarity grid lines to be covered and the spacing between the grid lines. The specific details are not limited herein. In this way, the first sub-busbar structure 31 can correspond to a plurality of first grid lines 121 and second grid lines 122. The number of grid lines corresponding to the first sub-busbar structure 31 is not limited and is related to the spacing between the grid lines.

[0114] Exemplarily, the number of the first sub-busbar structures 31 can be 0 - 400, and the number of the second sub-busbar structures 41 can be 0 - 400. This design can effectively reduce the amount of printing materials for the electrode structure and save welding materials in the case of the solder welding method. At the same time, it can also increase the current derivation path and reduce the risk of current loss caused by poor soldering between the busbar structure and the solder strip. In addition, the intermittent arrangement of the sub-busbar structures can increase the welding area and improve the tensile force and reliability during inter-chip welding.

[0115] In addition, in the embodiment of the present application, the shape of the avoidance groove 32 is not limited to meet different requirements. For example, the avoidance groove 32 can cooperate with the busbar structure body to form a shape similar to a sawtooth. For another example, the avoidance groove 32 can be square, U-shaped arc, inverted triangle, etc. The stencil design can be adjusted according to the comprehensive mass production feasibility and yield rate in the production and printing process of the battery cell 10. The sawtooth shape can collect and utilize the edge current to the greatest extent and reduce the short circuit and poor soldering power loss caused by the solder strip offset. Since each conductive wire and grid line is connected to the busbar structure, multiple paths are provided for current to converge, providing a double insurance for the collection of current for each grid line.

[0116] Embodiment Thirteen

[0117] Please refer to Figure 1 and Figure 2 In some alternative embodiments, the conductive wire 20 is a metal wire. In this way, the metal wire has good electrical conductivity and mechanical properties, can assist the grid line in current transfer, and avoid open circuits.

[0118] Specifically, the conductive wire 20 can cover the gate line. Of course, in other embodiments, the gate line can be longer than the conductive wire 20. For example, the exposed length range at the end of the gate line can be 0 - 50 mm, which can reduce the material consumption and cost of the conductive wire 20. Of course, in this case, if the gate line is intermittently arranged, the conductive wire 20 needs to cover and connect the gate lines of all paragraphs, that is, the gate line segments farthest from the busbar structure will also be connected together by the conductive wire 20 to ensure current collection.

[0119] In the embodiments of the present application, the cross-sectional shape of the conductive wire 20 is not limited. The conductive wire 20 is not limited to a circular, triangular, polygonal, flat or a structure with special treatments such as a reflective structure. For example, when the conductive wire 20 is circular, the diameter of the conductive wire 20 can be 0.05 - 0.5 mm. When the conductive wire 20 is extremely thin, the triangular shape may not achieve an ideal light reflection state. Therefore, a round wire conductive wire 20 is preferably used, which improves the bifacial ratio compared with the currently used flat conductive wire 20.

[0120] Example XIV

[0121] Please refer to Figure 1 and Figure 7 , in some alternative embodiments, the first gate line 121 is intermittently arranged; and / or

[0122] the second gate line 122 is intermittently arranged.

[0123] In this way, the intermittent arrangement of the gate lines can save the material for preparing the gate lines and reduce the cost. After the gate lines are intermittent, the conductive wire 20 can be connected to the gate lines to ensure that each segmented gate line can conduct the collected current into the busbar structure.

[0124] Specifically, the intermittent design of the gate lines enables the gate lines to be segmented in a certain area. In this way, the conductive wire 20 can be connected to the gate lines at the intermittent positions of the gate lines, ensuring that even at the disconnected places of the gate lines, each segment of the gate line can effectively conduct the collected current into the busbar structure. This optimizes the material use, reduces the production cost, and at the same time ensures the normal conduction of the current and the overall performance of the component. The connection design of the conductive wire 20 at the intermittent positions of the gate lines should ensure good electrical contact and the minimum resistance to ensure the efficient conduction of the current.

[0125] Further, no matter how the first gate line 121 is intermittently arranged, there must be a segment of the first gate line 121 connected to the first busbar structure 30. Similarly, no matter how the second gate line 122 is intermittently arranged, there must be a segment of the second gate line 122 connected to the second busbar structure 40.

[0126] Example XV

[0127] Please refer to Figure 7, in some alternative embodiments, an arching structure 23 is formed at the discontinuous position of the first gate line 121 and the second gate line 122 of the conductive line 20.

[0128] In this way, the arching structure 23 can effectively connect the two discontinuous gate lines, improving the stability and durability in use, avoiding warping, and preventing poor contact caused by mechanical stress or temperature changes. This design can not only provide more reliable electrical contact, but also effectively disperse and absorb the deformation caused by mechanical stress or thermal expansion and contraction, thus preventing poor contact or current loss. It is suitable for working under high temperature or stress conditions to ensure the long-term stability and performance of the battery module.

[0129] Embodiment Sixteen

[0130] Please refer to Figure 1 and Figure 2 , in some alternative embodiments, the first busbar structure 30 and the second busbar structure 40 are in contact and disposed on the back surface 12 of the solar cell 10; or

[0131] the first busbar structure 30 and the second busbar structure 40 are non-contact and disposed on the back surface 12 of the solar cell 10 and connected to the ends of the conductive line 20.

[0132] In this way, when the first busbar structure 30 and the second busbar structure 40 are in contact and disposed on the back surface 12 of the solar cell 10, the first busbar structure 30 and the second busbar structure 40 can be directly formed on the back surface 12 of the solar cell 10. When the first busbar structure 30 and the second busbar structure 40 are non-contact and disposed on the back surface 12 of the solar cell 10 and connected to the ends of the conductive line 20, the first busbar structure 30 and the second busbar structure 40 are only structures disposed at the edge of the solar cell 10.

[0133] Embodiment Seventeen

[0134] Please refer to Figure 1 and Figure 8 , the photovoltaic system 200 provided by the embodiment of the present application includes the back-contact battery module 100 as described in any one of the above embodiments.

[0135] In the back-contact battery module 100 and the photovoltaic system 200 according to the embodiments of the present application, the back-contact battery module 100 includes a battery cell 10, conductive wires 20, a first busbar structure 30, and a second busbar structure 40. The battery cell 10 has opposite front surface 11 and back surface 12. The back surface 12 is provided with a first grid line 121 and a second grid line 122. The first grid line 121 and the second grid line 122 extend along a first direction and are alternately distributed along a second direction. Among them, the first grid line 121 and the second grid line 122 have opposite polarities, and the first direction intersects the second direction. The conductive wires 20 include a first conductive wire 21 and a second conductive wire 22. The first conductive wire 21 and the second conductive wire 22 extend along the first direction and are alternately distributed along the second direction. The first conductive wire 21 covers and connects the first grid line 121, and the second conductive wire 22 covers and connects the second grid line 122. The first busbar structure 30 is arranged to extend along the second direction, and the first conductive wire 21 is at least partially connected to the first busbar structure 30. The second busbar structure 40 is arranged to extend along the second direction, and the second conductive wire 22 is at least partially connected to the second busbar structure 40. In this way, the conductive wires 20 can cooperate with the grid lines to provide more current extraction paths, improve the current collection effect on the battery cell 10. In the case of broken grid lines, hidden cracks, etc., the first busbar structure 30 and the second busbar structure 40 can export the current through the conductive wires 20, thereby ensuring stable current collection. At the same time, since the conductive wires 20 assist in carrying the current collection and transmission, the production costs brought by the silver paste / metallization process materials and equipment of the battery cell 10 can be further reduced.

[0136] In the embodiments of the present application, the specific connection method of adjacent battery cells 10 is not limited to meet different requirements. In one embodiment, at least a part of the edges of two adjacent battery cells 10 are stacked together; in another embodiment, two adjacent battery cells 10 can be arranged at intervals. The distance between two adjacent battery cells 10 is within a suitable range, which can avoid the small operation space and large welding difficulty caused by too small a distance, and can also avoid wasting the module space and increasing the cost caused by too large a distance.

[0137] It can be understood that in such an embodiment, the back-contact battery module 100 may further include a frame, a backsheet, a photovoltaic glass, and an encapsulant film. The encapsulant film can be filled between the front surface 11 and the back surface 12 of the back-contact battery, the photovoltaic glass, adjacent battery cells 10, etc. As a filler, it can be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulant film can adopt an EVA encapsulant film or a POE encapsulant film, and specific selection can be made according to the actual situation, which is not limited here.

[0138] The photovoltaic glass can be covered on the adhesive film on the front surface 11 of the back-contact battery. The photovoltaic glass can be ultra-white glass, which has a high light transmittance, high transparency, and excellent physical, mechanical, and optical properties. For example, the light transmittance of the ultra-white glass can reach more than 92%, and it can protect the back-contact battery without significantly affecting its efficiency. At the same time, the adhesive film can bond the photovoltaic glass and the back-contact battery together, and the presence of the adhesive film can provide sealing insulation and waterproof and moisture-proof protection for the back-contact battery.

[0139] The backplane can be attached to the adhesive film on the back surface 12 of the back-contact battery. The backplane can protect and support the back-contact battery, and has reliable insulation, water resistance, and aging resistance. The backplane can have multiple choices and is usually made of tempered glass, plexiglass, aluminum alloy TPT composite film, etc., and its specific selection can be set according to specific circumstances and is not limited here. The overall structure composed of the backplane, back-contact battery, adhesive film, and photovoltaic glass can be set on the frame. The frame serves as the main external support structure of the entire back-contact battery module 100 and can provide stable support and installation for the back-contact battery module 100. For example, the back-contact battery module 100 can be installed at the required installation location through the frame.

[0140] In this embodiment, the photovoltaic system 200 can be applied in photovoltaic power stations, such as ground power stations, rooftop power stations, and water surface power stations, or in devices or apparatuses that use solar energy for power generation, such as user solar power supplies, solar street lights, solar cars, solar buildings, etc. Of course, it can be understood that the application scenarios of the photovoltaic system 200 are not limited to this, that is to say, the photovoltaic system 200 can be applied in all fields that require solar power generation. Taking the photovoltaic power generation system network as an example, the photovoltaic system 200 can include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array can be an array combination of multiple back-contact battery modules 100. For example, multiple back-contact battery modules 100 can form multiple photovoltaic arrays. The photovoltaic arrays are connected to the combiner box, and the combiner box can collect the current generated by the photovoltaic arrays. After the collected current flows through the inverter and is converted into alternating current required by the mains power grid, it is connected to the mains network to achieve solar power supply.

[0141] In the description of this specification, the descriptions referring to terms such as "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0142] In addition, the above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A back-contact battery component, characterized in that, Comprising: A battery cell, the battery cell having opposite front and back surfaces, the back surface being provided with a first grid line and a second grid line, the first grid line and the second grid line extending along a first direction and being alternately distributed along a second direction, wherein the first grid line and the second grid line have opposite polarities, and the first direction and the second direction intersect; Conductive wires, including a first conductive wire and a second conductive wire, the first conductive wire and the second conductive wire extending along the first direction and being alternately distributed along the second direction, the first conductive wire covering and connecting the first grid line, and the second conductive wire covering and connecting the second grid line; A first current collecting structure, the first current collecting structure being arranged to extend along the second direction, and at least part of the first conductive wire being connected to the first current collecting structure; A second current collecting structure, the second current collecting structure being arranged to extend along the second direction, and at least part of the second conductive wire being connected to the second current collecting structure.

2. The back-contact battery assembly according to claim 1, wherein The first current collecting structure and the second current collecting structure are arranged on both side edges of the back surface of the same battery cell, the first current collecting structure and the second current collecting structure having opposite polarities, and the first current collecting structure of the battery cell is electrically connected to the second current collecting structure of an adjacent battery cell.

3. The back-contact battery assembly according to claim 2, characterized in that, The back contact battery assembly further includes a third current collecting structure, the third current collecting structure being electrically connected to the first current collecting structure of the battery cell and the second current collecting structure of an adjacent battery cell; or The first current collecting structure of the battery cell and the second current collecting structure of an adjacent battery cell are at least partially overlapped and arranged together.

4. The back-contact battery assembly according to claim 1, characterized in that, The back contact battery assembly further includes a connection structure, the connection structure including a first connection structure and a second connection structure, the first connection structure being used for connecting the first grid line and the first current collecting structure, and the second connection structure being used for connecting the second grid line and the second current collecting structure.

5. The back contact battery component according to claim 4, characterized in that, In the first direction, the width of the connection structure is gradually changed, and the connection structure is wider near the first current collecting structure and the second current collecting structure.

6. The back-contact battery component according to claim 5, characterized in that, The first connection structure is in a triangular or trapezoidal shape; and / or The second connection structure is in a triangular or trapezoidal shape.

7. The back-contact battery assembly according to claim 1, wherein, In the second direction, the first grid line and the second grid line are arranged at equal intervals and / or non-equal intervals.

8. The back-contact battery assembly according to claim 1, characterized in that, In the first direction, the first grid lines are all arranged at equal intervals and / or non-equal intervals with the second current collecting structure, and the second grid lines are all arranged at equal intervals and / or non-equal intervals with the first current collecting structure.

9. The back-contact battery component according to claim 1, wherein The widths of the first current collecting structure and the second current collecting structure in the first direction are 0.05 - 0.5 mm.

10. The back-contact battery assembly according to claim 1, wherein, The first current collecting structure and the second current collecting structure both form avoidance grooves on the side close to the conductive wires, at least part of the first grid line extends into the avoidance groove of the second current collecting structure, and at least part of the second grid line extends into the avoidance groove of the first current collecting structure.

11. The back contact battery component according to claim 1, characterized in that, The first current collecting structure includes a plurality of first sub-current collecting structures arranged along the second direction, and at least one second grid line extends between two adjacent first sub-current collecting structures; The second busbar structure includes a plurality of second sub-busbar structures arranged along the second direction, and at least one of the first grid lines extends between two adjacent second sub-busbar structures.

12. The back contact battery assembly according to claim 11, wherein, The first sub-busbar structure and the second sub-busbar structure are both formed with avoidance grooves on the side close to the conductive wire. At least a part of the first grid line extends into the avoidance groove of the second sub-busbar structure, and at least a part of the second grid line extends into the avoidance groove of the first sub-busbar structure.

13. The back contact battery assembly according to claim 1, wherein, The conductive wire is a metal wire.

14. The back-contact battery component according to claim 1, wherein, The first grid line is arranged discontinuously; and / or The second grid line is arranged discontinuously.

15. The back-contact battery assembly according to claim 14, characterized in that, The conductive wire forms an arch structure at the discontinuous positions of the first grid line and the second grid line.

16. The back-contact battery assembly according to claim 1, wherein The first busbar structure and the second busbar structure are in contact and arranged on the back surface of the battery cell; or The first busbar structure and the second busbar structure are non-contact arranged on the back surface of the battery cell and connected to the ends of the conductive wire.

17. A photovoltaic system, characterized in that, Comprising a back-contact battery assembly according to any one of claims 1-16.

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