Photovoltaic module and method of manufacturing the same

Abstract

The application discloses a photovoltaic module and a preparation method thereof. The photovoltaic module comprises an electrical connector and a plurality of cell pieces. The cell piece comprises a plurality of current collecting electrodes, a plurality of bus electrodes and a plurality of interconnecting parts. The bus electrodes extend along a second direction and are electrically connected with the current collecting electrodes of the same polarity. The electrical connector is electrically connected with the electrode structure through a first connector and a second connector. The first connector is arranged on the side of the interconnecting part away from the cell body. The second connector is arranged on the side of the bus electrode away from the cell body. In the application, the second connector is arranged on the bus electrode, and the second connector is also connected with the electrical connector. Firstly, the connection tension such as welding tension between the cell piece and the electrical connector is increased, and thus the yield is improved. Secondly, the current collecting path is increased, and the risk of cell piece cracking or breaking is reduced. Thirdly, the bus electrode contains copper, the cost of copper is relatively low, and the cost of the photovoltaic module can be reduced.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic technology, specifically relating to a photovoltaic module and a method for preparing a photovoltaic module. Background Technology

[0002] Individual solar cells have poor mechanical strength, are easily affected by the environment, and have very low output voltage, current and power. Therefore, multiple solar cells are usually packaged into photovoltaic modules for use.

[0003] In photovoltaic modules, multiple solar cells are typically connected in series by electrical connectors such as solder strips and conductive backsheets to form a cell string, which is then further used to form a cell string array.

[0004] Photovoltaic modules manufactured using cells with copper-containing busbar electrodes often suffer from insufficient connection reliability, such as inadequate welding reliability. This is mainly manifested in low connection tensile strength between electrical connectors and the cells, which also affects current collection efficiency. Currently, insufficient connection reliability significantly impacts yield rates. Summary of the Invention

[0005] This application aims to provide a photovoltaic module that at least solves one of the problems of poor reliability in the connection between electrical connectors and cell electrodes containing copper.

[0006] In a first aspect, embodiments of this application propose a photovoltaic module, comprising: A plurality of battery strings; the battery strings include electrical connectors and a plurality of battery cells, the electrical connectors electrically connecting adjacent battery cells; each battery cell includes: a battery body, and an electrode structure located on at least one side of the battery body; the electrode structure includes: a plurality of current collector electrodes, a plurality of current bus electrodes, and a plurality of interconnects, the current collector electrodes all extending along a first direction and spaced apart along a second direction, the first direction being perpendicular to the second direction; the current bus electrodes extending along the second direction and electrically connected to the current collector electrodes of the same polarity; the interconnects are electrically connected to the current collector electrodes of the same polarity; among the plurality of interconnects, the interconnects located along the second direction at the edge of the battery body are edge interconnects; the photovoltaic module further includes: A plurality of first connectors and a plurality of second connectors; the electrical connectors are electrically connected to the electrode structure via the first connectors and the second connectors; The first connector is disposed on the side of the interconnect portion away from the battery body; the second connector is disposed on the side of the bus electrode away from the battery body; The busbar electrode comprises at least copper; the busbar electrode connects to the edge interconnect and extends from the edge interconnect toward the edge of the battery body; and / or the busbar electrode is located between two edge interconnects that are opposite each other along the second direction.

[0007] In this application, based on the electrical connection between the solar cell and the electrical connector via a first connector on the interconnect portion, a second connector is provided on the bus electrode, which is also connected to the electrical connector. This has several advantages: First, it increases the pathways and contact area for electrical connection between the solar cell and the electrical connector, thereby increasing the connection tension (such as welding tension) and significantly reducing weld misalignment issues, improving electrical connection reliability and yield. Second, the second connector, also connected to the electrical connector, increases the current collection path and improves the electrical connection effect between the solar cell and the electrical connector, reducing the series resistance of the photovoltaic module and improving its efficiency. Third, in the second direction, the first and second connectors can also disperse the connection stress between the solar cell and the electrical connector, reducing the risk of microcracks or breakage of the solar cell. Fourth, the bus electrode contains copper, which is relatively inexpensive, further reducing the cost of the photovoltaic module.

[0008] In some embodiments, the bus electrode is located between two edge interconnects opposite each other along the second direction, wherein the second connector is disposed between two adjacent interconnects.

[0009] In some embodiments, the bus electrode comprises a copper bus electrode with a width of 0.5 mm to 1.2 mm.

[0010] In some embodiments, for a second connector disposed between two adjacent interconnecting portions: The number of second connectors between two adjacent interconnecting parts is greater than or equal to 1; and / or, The second connector and the adjacent interconnecting portions are spaced apart; and / or, When the number of second connectors between two adjacent interconnecting parts is greater than 1, the adjacent second connectors are spaced apart; and / or, In the first direction: the width of the bus electrode is greater than or equal to the width of the second connector, and / or, the width of the second connector is greater than or equal to the width of the electrical connector; and / or, The second connector is distributed roughly evenly between two adjacent interconnects.

[0011] In some embodiments, in the first direction, the width of the second connector is 0.5 mm to 0.9 mm; and / or, In the second direction, the length of the second connector is 0.5 mm to 0.9 mm.

[0012] In some embodiments, the bus electrode comprises a silver-copper bus electrode with a width of 0.1 mm to 0.4 mm.

[0013] In some embodiments, for a second connector disposed between two adjacent interconnecting portions: Along the second direction, the second connector connects at least one of the two adjacent interconnect portions; and / or, Along the first direction: the second connector has a portion where the width decreases; and / or, Along the first direction: the maximum width of the second connector is greater than or equal to the width of the electrical connector, and / or the maximum width of the electrical connector is greater than or equal to the width of the bus electrode.

[0014] In some embodiments, along the first direction: the number of portions in the second connector whose width decreases from large to small is greater than or equal to 2; and / or, In the second connector, the portion whose width decreases from large to small is roughly evenly distributed between two adjacent interconnecting portions.

[0015] In some embodiments, along the first direction, the maximum width of the second connector is 0.1 mm to 0.5 mm.

[0016] In some embodiments, a first electrode structure and a second electrode structure are provided on one side of the battery body, the first electrode structure and the second electrode structure having different polarities; the bus electrode is continuously disposed between two edge interconnections opposite to each other along the second direction and is connected to the current collector electrode of the same polarity; The current collectors of opposite polarities are continuously disposed at the current collector. The photovoltaic module further includes: an insulating layer, at least disposed in the current collectors of opposite polarities, with the portion intersecting the current collector on the side away from the battery body; the current collector is disposed on the side of the current collectors of the same polarity and the insulating layer away from the battery body; or, The current collector of opposite polarity is disconnected near the bus electrode.

[0017] In some embodiments, the bus electrode is connected to the edge interconnect and extends from the edge interconnect toward the edge of the battery body, wherein the second connector is disposed on the edge interconnect near the edge of the battery body.

[0018] In some embodiments, the bus electrode comprises a copper bus electrode with a width of 0.1 mm to 0.5 mm.

[0019] In some embodiments, for a second connector located on the edge side of the edge interconnect near the edge of the battery body: The number of the second connectors is greater than or equal to 3; and / or, The second connector and the adjacent edge interconnects are spaced apart; and / or, Adjacent second connectors are spaced apart; and / or, The spacing between adjacent second connectors is equal; and / or, The second connector and the edge of the battery body are spaced apart; and / or, In the second direction: the current collector electrode located at the edge of the battery body is the edge current collector electrode, and the second connector is located inside the edge current collector electrode.

[0020] In some embodiments, the second connector has a width of 0.1 mm to 0.4 mm in the first direction and a length of 0.5 mm to 0.6 mm in the second direction; the spacing between adjacent second connectors in the second direction is 0.2 mm to 0.3 mm; or, the second connector has a width of 0.5 mm to 0.7 mm in the first direction and a length of 0.2 mm to 0.4 mm in the second direction; the spacing between adjacent second connectors in the second direction is 0.5 mm to 0.6 mm. And / or, The bus electrode includes an N-type bus electrode and a P-type bus electrode, wherein the one-dimensional dimension of the second connector on the N-type bus electrode is 100 μm to 320 μm, and / or the one-dimensional dimension of the second connector on the P-type bus electrode is 180 μm to 280 μm.

[0021] In some embodiments, a first electrode structure and a second electrode structure are provided on one side of the battery body, and the first electrode structure and the second electrode structure have different polarities; the same battery string includes: an A battery cell and a B battery cell distributed adjacent to each other along the second direction; In an adjacent A-cell and a B-cell, the second connector on the busbar electrode of the A-cell is symmetrically distributed with the second connector on the busbar electrode of the B-cell, and the axis of symmetry is parallel to the first direction. In the two adjacent busbars on the same side of the A-cell in the second direction: the distribution length of the second connector on one busbar along the second direction is greater than the distribution length of the second connector on the other busbar along the second direction; or, one busbar has a second connector, and the other busbar does not have a second connector; and / or, In the two collinear bus electrodes of the A-cell cell along the second direction: the distribution length of the second connector on one bus electrode along the second direction is greater than the distribution length of the second connector on the other bus electrode along the second direction; or, one bus electrode is provided with the second connector, and the other bus electrode is not provided with the second connector.

[0022] In some embodiments, two battery strings connected in series are symmetrically distributed, with the axis of symmetry parallel to the first direction.

[0023] In some embodiments, the photovoltaic module further includes a backsheet located on the back side of the battery string, the backsheet having lead-out holes, and the electrical connectors being offset from the lead-out holes.

[0024] In some embodiments, the second connector on the bus electrode is connected to a current collector electrically connected to the bus electrode; and / or, The projection of the centerline of the second connector on the busbar extending along the first direction onto the plane of the solar cell at least partially coincides with the current collector electrically connected to the busbar; and / or, The first connector and the second connector are made of the same material.

[0025] In some embodiments, the one-dimensional dimension of the first connector on the edge interconnect is greater than or equal to 0.8 mm and less than or equal to 1.3 mm; and / or, The interconnection portion further includes: an intermediate interconnection portion located inside the edge interconnection portion in the second direction, wherein the one-dimensional dimension of the intermediate interconnection portion is less than or equal to the one-dimensional dimension of the edge interconnection portion; the one-dimensional dimension of the first connector on the intermediate interconnection portion is greater than or equal to 0.7 mm and less than or equal to 1.2 mm; and / or, In the case where the connector protrudes from the electrical connector, the one-dimensional dimension of the portion of the connector from which the electrical connector protrudes is less than or equal to 200 μm.

[0026] A second aspect of this application also provides a method for preparing a photovoltaic module, comprising: A battery cell is provided, the battery cell comprising: a battery body, and an electrode structure located on at least one side of the battery body; the electrode structure comprising: a plurality of current collector electrodes, a plurality of current bus electrodes, and a plurality of interconnects, wherein the current collector electrodes extend along a first direction and are spaced apart along a second direction, the first direction being perpendicular to the second direction; the current bus electrodes extend along the second direction and are electrically connected to the current collector electrodes of the same polarity; the interconnects are electrically connected to the current collector electrodes of the same polarity; among the plurality of interconnects, the interconnects located along the second direction at the edge of the battery body are edge interconnects; the current bus electrodes comprise at least copper; the current bus electrodes connect to the edge interconnects and extend from the edge interconnects to the edge of the battery body, and / or, the current bus electrodes are located between two opposite edge interconnects along the second direction; A first connector is provided on the side of the interconnection portion away from the battery body, and a second connector is provided on the side of the bus electrode away from the battery body; the first connector and the second connector are provided in the same process. An electrical connector is provided on the side of the first connector and the second connector away from the battery body.

[0027] In some embodiments, a first connector is provided on the side of the interconnect portion away from the battery body, including: At least two first connector precursors are printed on the side of the edge interconnection away from the battery body, and one first connector precursor is printed on the side of the interconnection away from the battery body outside the edge interconnection; the at least two first connector precursors on the edge interconnection are fused into one first connector in the process of setting the electrical connector. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is an exploded view of a photovoltaic module according to an embodiment of this application; Figure 2 This is a schematic diagram of a series-connected battery string of a photovoltaic module according to an embodiment of this application; Figure 3 , Figure 6 , Figure 7 , Figure 10 , Figures 13 to 18 These are several partial schematic diagrams of the back surface of a photovoltaic module according to embodiments of this application; Figure 4 This is a partial photograph of the back surface of a photovoltaic module according to an embodiment of this application; Figure 5This is a partial cross-sectional schematic diagram of a photovoltaic module according to an embodiment of this application; Figures 8 to 9 This is a printed schematic diagram of the connector of a photovoltaic module according to an embodiment of this application; Figure 11 These are partial EL images of the relevant photovoltaic modules; Figure 12 This is a partial EL photograph of a photovoltaic module according to an embodiment of this application.

[0029] Figure label: 100-Photovoltaic module, 10-Battery cell, 20-Cover glass, 30-Front encapsulation film, 40-Rear encapsulation film, 50-Backsheet, 60-Electrical connector, 70-Frame, 80-Junction box, 90-Wire connector, 11-First connector, 12-Bus bar, 13-Location of lead hole, 14-Second connector, 101-Battery body, 103-Current collector electrode, 1031-First current collector electrode, 1032-Second current collector electrode, 15-Insulator, 102-Bus bar, 1021-End wire, 1022-Connecting wire, 104-Interconnection part, 1041-End interconnection part, 1042-Intermediate interconnection part, 16-Pre-body of first connector, 17-Pre-body of second connector. Detailed Implementation

[0030] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] The inventors of this application have discovered that the main reason why photovoltaic modules formed by cell cells containing copper (copper element) busbar electrodes are prone to insufficient connection reliability is that copper has poor wettability, which makes the connection reliability between the busbar electrode and other electrode structures such as interconnection parts poor, causing electrical connectors to be easily pulled off from the cell surface.

[0032] To address the aforementioned technical problems, and specifically for solar cells containing copper-containing busbar electrodes, this application, based on the electrical connection between the solar cell and an electrical connector via a first connector on the interconnect portion, further enhances the connection by providing a second connector on the busbar electrode. This second connector is also connected to the electrical connector. Firstly, this increases the pathways and contact area for electrical connection between the solar cell and the electrical connector, thereby increasing the connection tensile force (e.g., welding tensile force) and significantly reducing weld misalignment issues, improving electrical connection reliability, and ultimately increasing yield. Secondly, the second connector, also connected to the electrical connector, increases the current collection path and improves the electrical connection effect between the solar cell and the electrical connector, reducing the series resistance of the photovoltaic module and improving its efficiency. Thirdly, in the second direction, the first and second connectors can also disperse the connection stress between the solar cell and the electrical connector, reducing the risk of microcracks or breakage of the solar cell. Fourthly, the busbar electrode contains copper, which is relatively inexpensive, further reducing the cost of the photovoltaic module. The following detailed description, in conjunction with specific accompanying drawings, further explains this application. Some remaining structures have been omitted in the drawings to highlight the relevant structures. Figure 4 It is a photo of the exposed structure after the electrical connectors were torn off. During the process of tearing off the electrical connectors, some of the connectors were torn off together.

[0033] This application provides a photovoltaic module, with reference to... Figures 1 to 3 The photovoltaic module 100 includes: a plurality of cell strings, which are the main power generation units in the photovoltaic module 100. Each cell string includes an electrical connector 60 and a plurality of cell cells 10. The electrical connector 60 electrically connects adjacent cell cells 10. (Refer to...) Figure 2In the same battery string, individual cells can be connected in series. The number of battery strings in a photovoltaic module is not limited. Besides battery strings or arrays, a photovoltaic module may also include a cover glass 20, a front encapsulation film 30, a rear encapsulation film 40, and a backsheet 50. The battery cell 10 is the main power generation unit in the battery string. The cell has opposing light-facing and back-facing sides, and is a bifacial solar cell with electrode structures on both the light-facing and back-facing sides, such as a TOPcon (tunneling oxide passivated contact) cell. Alternatively, the cell may be a back-contact solar cell with electrode structures only on the back-facing side, such as a heterojunction with back contact (HBC) solar cell or a back-contact TBC (tunneling oxide passivated back contact) cell. The cell can be a half-cell formed by cutting a whole cell in half, or a segmented cell formed by dividing a whole cell into multiple segments. The cells can be stacked to form a battery string, or gaps can exist between adjacent cells in the battery string; all of these are within the scope of protection of this application. In the embodiments of this application, the electrical connector 60 can be a solder strip, etc. For example, the electrical connector 60 can be a round wire solder strip, or a flat solder strip with different widths and thicknesses, etc. The material of the electrical connector is not limited. For example, the material of the electrical connector can be tin-plated copper strip, with the base material being copper rolled, which has the characteristics of high conductivity and low resistance. The coating layer is tin-lead or tin-lead-bismuth alloy, which mainly serves to protect the copper base from oxidation when exposed to air and to alloy it during welding to ensure the welding effect. The size of the electrical connector is not limited.

[0034] Reference Figures 4 to 6The battery cell includes a battery body 101 and an electrode structure located on at least one side of the battery body. The battery body includes a PN junction, and the electrode structure is used to conduct current from the battery body. The electrode structure includes a plurality of current collectors 103, a plurality of current buses 102, and a plurality of interconnects 104. The current collectors 103 are used to collect current from the battery body 101, the current buses 102 are used to collect current from the current collectors 103, and the interconnects 104 can conduct current from the battery cell. The current collectors 103 all extend along a first direction X and are spaced apart along a second direction Y. The overall orientation of the current collectors 103 is along the first direction X, but bending in other directions is allowed locally. The first direction X is perpendicular to the second direction Y. In this application, perpendicular means that the angle between the two is approximately 90° or close to 90°. The angle between the first direction X and the second direction Y can be 80° to 100°. The bus electrode 102 extends along the second direction Y, and its overall orientation is along the second direction Y, but local bending in other directions is permitted. The bus electrode 102 is electrically connected to the current collector 103 of the same polarity, meaning that the positive current collector is electrically connected to the positive bus electrode, and the negative current collector is electrically connected to the negative bus electrode. Positive polarity corresponds to the P-type electrode, and negative polarity corresponds to the N-type electrode. The interconnect portion 104 is electrically connected to the current collector 103 of the same polarity, meaning that the positive current collector is electrically connected to the positive interconnect portion, and the negative current collector is electrically connected to the negative interconnect portion. The number of current collectors 103, bus electrodes 102, and interconnect portions 104 in the solar cell is not limited. Among the several interconnections 104 of the battery cell, the interconnection located at the edge of the battery body 101 along the second direction Y is called the edge interconnection 1041, that is, the edge interconnection 1041 is the interconnection of the battery cell near the edge of the battery body in the second direction Y. The interconnections other than the edge interconnection 1041 among the several interconnections 104 of the battery cell can be intermediate interconnections 1042. In the first direction X and / or the second direction Y, the size of the edge interconnection 1041 can be greater than or equal to the size of the intermediate interconnection 1042. Specifically, the edge position of the battery body in the second direction Y is usually the starting point of the electrical connection between the electrical connector 60 and the battery cell 10. The reliability of the electrical connection at this position has a significant impact on the electrical connection effect between the electrical connector 60 and the battery cell 10. Therefore, the edge interconnection 1041 at this position is larger, and the contact area between the edge interconnection 1041 and the electrical connector 60 is larger, improving the bonding force between the two and enhancing the electrical connection effect.

[0035] Reference Figures 4 to 6The photovoltaic module also includes several first connectors 11 and several second connectors 14. Electrical connectors 60 are electrically connected to the cell electrode structure via the first connectors 11 and the second connectors 14. The first connectors 11 and the second connectors 14 primarily serve to facilitate a reliable electrical and mechanical connection between the electrode structure of the cell 10 and the electrical connectors 60, and to improve welding quality. The number of first connectors 11 and second connectors 14 in this photovoltaic module is not limited. The first connectors 11 are located on the side of the interconnect 104 away from the cell body 101, and the second connectors 14 are located on the side of the busbar electrode 102 away from the cell body 101. The biggest difference between the first connectors 11 and the second connectors 14 here is their different positions. The busbar electrode 102 contains at least copper (copper element). The busbar electrode 102 connects to the edge interconnect 1041 and extends from the edge interconnect 1041 to the edge of the battery body 101 (e.g., end line 1021). Alternatively, the busbar electrode 102 is located between two opposite edge interconnects 1041 along the second direction Y (e.g., connecting line 1022). Based on the battery cell being electrically connected to the electrical connector 60 via the first connector 11 on the interconnect 104, a second connector 14 is provided on the busbar electrode 102, and the second connector 14 is also connected to the electrical connector 60. This increases the electrical connection between the battery cell and the electrical connector 60. The connection pathways and contact area increase the connection tension (such as welding tension) between the solar cell 10 and the electrical connector 60, significantly reducing welding misalignment and improving electrical connection reliability, thereby increasing yield. Secondly, the second connector 14 is also connected to the electrical connector 60, increasing the current collection path and improving the electrical connection between the solar cell 10 and the electrical connector 60. This also reduces the series resistance of the photovoltaic module, improving its efficiency. Thirdly, in the second direction Y, the first connector 11 and the second connector 14 can disperse the connection stress between the solar cell 10 and the electrical connector 60, reducing the risk of microcracks or breakage of the solar cell. Fourthly, the bus electrode contains copper, which is relatively inexpensive, further reducing the cost of the photovoltaic module.

[0036] In this application, while the bus electrode 102 contains copper, the other components are not specifically limited. Any photovoltaic module with a bus electrode 102 (at least one terminal line 1021 and / or at least one connecting line 1022) having the aforementioned second connector 14, and the second connector 14 being electrically connected to the electrical connector 60, is within the scope of protection of this application.

[0037] In some embodiments, refer to Figure 6 and Figure 7In the battery cell: the bus electrode is located between two edge interconnects 1041 opposite each other along the second direction Y, wherein the second connector 14 is disposed between two adjacent interconnects 104, and the bus electrode here may include a connecting line 1022, the second connector 14 being disposed on the side of the connecting line 1022 between two adjacent interconnects 104 away from the battery body 101. For the bus electrode, which may include a connecting wire 1022 containing copper, the number of paths and contact areas for electrical connection between the cell and the electrical connector 60 is increased, thereby increasing the connection tension, such as welding tension, between the cell 10 and the electrical connector 60, and significantly reducing the problem of welding misalignment, improving the reliability of electrical connection, and thus improving yield. The increased current collection path and better electrical connection between the cell 10 and the electrical connector 60 can also reduce the series resistance of the photovoltaic module and improve the efficiency of the photovoltaic module. In the second direction Y, the first connector 11 and the second connector 14 can also disperse the connection stress between the cell 10 and the electrical connector 60, reducing the risk of microcracks or breakage of the cell.

[0038] In some embodiments, refer to Figure 6 For a bus electrode that includes a connecting wire 1022 containing copper, specifically a copper bus electrode where the metal element is primarily copper, or where the connecting wire 1022 is primarily copper, the bus electrode width d1 is 0.5mm to 1.2mm. A larger bus electrode width d1, without changing the current transmission length, reduces resistance, thus lowering resistance and improving battery efficiency. Furthermore, even if a single interconnect falls off during a thermal shock test, the wider bus electrode width d1 ensures good overall transmission and maintains good transmission capability. Therefore, transmission and reliability can be guaranteed without adding additional connectors. Additionally, a larger bus electrode size increases the contact area between the bus electrode and its adjacent electrodes or with the second connector 14, further optimizing the bonding force between the battery cell and the electrical connector 60, and further improving current collection efficiency. For example, the bus electrode width d1 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, or 1.2mm. The width of the bus electrode d1 is along the first direction X.

[0039] In some embodiments, refer to Figure 6For the bus electrode, a connecting line 1022 can be included, and the connecting line 1022 contains copper. For the second connector 14 located between two adjacent interconnect portions, the number of second connectors 14 between two adjacent interconnect portions is greater than or equal to one. Specifically, as mentioned above, a larger bus electrode width d1 results in lower resistance. A larger bus electrode size also increases the contact area between the bus electrode and its adjacent electrode or with the second connector 14. Therefore, as long as a second connector 14 is provided between two adjacent interconnect portions, the bonding force between the battery cell and the electrical connector 60 can be significantly improved, further optimizing the current collection effect. Two adjacent interconnect portions can refer to either the area between the edge interconnect portion 1041 and the adjacent intermediate interconnect portion 1042, or the area between adjacent intermediate interconnect portions 1042.

[0040] For example, Figure 6 In this example, the number of second connectors 14 between two adjacent interconnecting parts is 1. Alternatively, the number of second connectors 14 between two adjacent interconnecting parts can be 2, 3, 4, etc.

[0041] In some embodiments, refer to Figure 6 For a bus electrode that includes a connecting line 1022 containing copper, the second connector 14 located between two adjacent interconnects is spaced apart from the adjacent interconnects 104. Specifically, the wettability of the second connector on the surface of the copper bus electrode is relatively small. Furthermore, compared to the second connector being integrated with another adjacent interconnect 104, the spaced distribution of the second connector on the surface of the copper bus electrode with the adjacent interconnect 104 results in a more balanced improvement in bonding strength, current collection, and microcrack reduction on both sides of the second connector, and the wider distribution of the second connector leads to a broader range of improvements in bonding strength, current collection, and microcrack reduction. In some embodiments, the bus electrode may include a connecting line 1022, and the connecting line 1022 contains copper. For the second connector 14 disposed between two adjacent interconnects, when the number of second connectors 14 between two adjacent interconnects is greater than 1, the adjacent second connectors 14 are spaced apart along the second direction Y. When the amount of material used for the second connectors is approximately the same, the second connector 14 covers a larger size and has a wider range of effects on improving bonding strength, current collection and microcracks.

[0042] In some embodiments, refer to Figure 6Regarding the bus electrode, which may include a connecting line 1022 containing copper: For the second connector 14 located between two adjacent interconnects, in the first direction X: the width d1 of the bus electrode is greater than or equal to the width d2 of the second connector 14. This means the second connector 14 on the bus electrode essentially does not extend beyond the bus electrode or connecting line, thus preventing it from contacting adjacent collector electrodes of opposite polarity and causing a short circuit risk. When d2 varies at different locations of the same second connector 14, the width d2 of the second connector 14 can refer to its maximum width, etc.

[0043] In some embodiments, refer to Figure 6 For the bus electrode, a connection line 1022 may be included, and the connection line 1022 contains copper. For the second connector 14 located between two adjacent interconnects, in the first direction X: the width d2 of the second connector 14 is greater than or equal to the width of the electrical connector 60 connected to the second connector 14, and the two widths are approximately equal, or the width of the second connector 14 is slightly larger, which can accommodate the setting deviation of the electrical connector 60, and the setting process window of the electrical connector 60 is relatively large.

[0044] In some embodiments, refer to Figure 6 Regarding the bus electrode, which may include a connecting line 1022 containing copper: For the second connector 14 located between two adjacent interconnects, the second connector 14 is approximately evenly distributed between the two adjacent interconnects, resulting in a more balanced improvement in bonding force, current collection, and microcrack reduction at various locations between the two adjacent interconnects. Here, "approximately evenly distributed" means that in the second direction Y, if the distance between two adjacent interconnects is L1 and the number of second connectors 14 between two adjacent interconnects is m, then the second connectors 14 are approximately distributed at the m+1 equal division points of the distance L1 between the two adjacent interconnects. For example, Figure 6 In the second direction Y, the distance between two adjacent interconnecting parts is L1, and the number of second connectors 14 between two adjacent interconnecting parts is 1. The second connectors 14 are roughly distributed in the middle position of the distance L1 between two adjacent interconnecting parts.

[0045] In some embodiments, refer to Figure 6Regarding the bus electrode, which may include a connecting line 1022 containing copper: For the second connector 14 located between two adjacent interconnects, in the first direction X: the width d2 of the second connector 14 is 0.5mm to 0.9mm. If the width d2 of the second connector 14 is too small, its effect on improving bonding strength, current collection, and microcrack prevention in the first direction X is poor. If the width d2 of the second connector 14 is too large, it will lead to material waste, and the exposed size of the electrical connector 60 in the first direction X may be large. Without the coverage of the electrical connector 60, the second connector 14, due to its organic components, is prone to cracking during drying or heating, which may easily cause a short circuit risk. Therefore, in this application, d2 is within the above range, which has a better effect on improving bonding strength, current collection, and microcrack prevention, and does not lead to material waste, while also reducing the risk of short circuits.

[0046] For example, d2 can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, or 0.9mm.

[0047] In some embodiments, refer to Figure 6 Regarding the bus electrode, which may include a connecting wire 1022 containing copper: For the second connector 14 located between two adjacent interconnects, in the second direction Y: the length w1 of the second connector 14 is 0.5 mm to 0.9 mm. If the length w1 of the second connector 14 is too small, its effect on improving bonding strength, current collection, and microcracks in the second direction Y is poor. If the length w1 of the second connector 14 is too large, it will lead to material waste. Therefore, in this application, w1 is within the above range, which has a better effect on improving bonding strength, current collection, and microcracks, and will not lead to material waste.

[0048] For example, w1 can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, or 0.9mm.

[0049] In some embodiments, refer to Figure 7The bus electrode may include a connecting line 1022, and the connecting line 1022 may include a silver-copper bus electrode. Specifically, a silver-copper bus electrode refers to a bus electrode whose main metal elements are silver and copper, such as silver-clad copper. Alternatively, the connecting line 1022 may contain mainly copper and silver. In this case, the bus electrode width d1 is 0.1 mm to 0.4 mm. Because the bus electrode contains silver, it has good conductivity and electrical connection performance. Therefore, an excessively large bus electrode width d1 is wasteful and leads to higher cell costs. Thus, in this application, the bus electrode width d1 is within the above range, resulting in good conductivity and electrical connection performance while also reducing cost. For example, the bus electrode width d1 can be 0.1 mm, 0.12 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, or 0.4 mm. The width of the bus electrode d1 is along the first direction X.

[0050] In some embodiments, refer to Figure 7 Regarding the bus electrode, which may include connecting lines 1022 containing silver and copper elements: A second connector 14 is disposed between two adjacent interconnects, connecting at least one of the two adjacent interconnects 104. Specifically, the second connector on the surface of the silver-copper bus electrode has good wettability, and it is integrally formed with at least one of the two adjacent interconnects 104. The second connector covers a wider area on the surface of the silver-copper bus electrode, resulting in better adhesion, current collection, and microcrack reduction between the two adjacent interconnects 104. For example, Figure 7 In this context, a second connector 14 is provided between two adjacent interconnecting parts, and the second connector 14 connects to both adjacent interconnecting parts 104.

[0051] In some embodiments, refer to Figure 7 For the bus electrode, a connecting line 1022 may be included, and the connecting line 1022 contains silver and copper elements: For the second connector 14 located between two adjacent interconnects, along the first direction X: the second connector 14 has a portion where the width gradually decreases. This gradual decrease indicates that the width has a roughly gradual change. With the material usage of the second connector 14 remaining unchanged, the coverage area of ​​the second connector 14 can be expanded through this gradual change or decrease. Furthermore, the bonding force, current collection effect, and microcracks can all be gradually improved, thus improving the bonding force, current collection, and microcracks between the two adjacent interconnects 104.

[0052] In some embodiments, refer to Figure 7For the bus electrode, a connection line 1022 may be included, and the connection line 1022 contains silver and copper elements. For the second connector 14 located between two adjacent interconnects, in the first direction X: the maximum width d2 of the second connector 14 is greater than or equal to the width of the electrical connector 60 connected to the second connector 14, and the two widths are approximately equal, or the width of the second connector 14 is slightly larger, which can accommodate the setting deviation of the electrical connector 60, etc., and the setting process window of the electrical connector 60 is relatively large.

[0053] In some embodiments, refer to Figure 7 For the bus electrode, a connection line 1022 may be included, and the connection line 1022 contains silver and copper elements: For the second connector 14 located between two adjacent interconnects, in the first direction X: the maximum width d2 of the second connector 14 is greater than or equal to the width d1 of the bus electrode, or the width of the second connector 14 is slightly larger, which can accommodate the setting deviation of the electrical connector 60, etc., and the setting process window of the electrical connector 60 is larger.

[0054] In some embodiments, refer to Figure 7 For the bus electrode, a connecting line 1022 may be included, and the connecting line 1022 contains silver and copper elements: For the second connector 14 located between two adjacent interconnects, along the first direction X: the number of portions where the width of the second connector 14 decreases from large to small is greater than or equal to 2, indicating that there are more locations where the bonding force, current collection effect and microcrack gradient improvement are improved between the two adjacent interconnects, thus the bonding force, current collection and microcrack improvement effect between the two adjacent interconnects 104 are better.

[0055] For example, Figure 7 In the above, for the bus electrode, a connection line 1022 may be included, and the connection line 1022 contains silver and copper elements: For the second connector 14 located between two adjacent interconnects, along the first direction X: the number of the portions of the second connector 14 whose width decreases from large to small can be 4, and along the second direction Y, the above 4 portions whose width decreases from large to small are located on both sides of the maximum width d2.

[0056] In some embodiments, refer to Figure 7 For the bus electrode, a connecting line 1022 may be included, and the connecting line 1022 contains silver and copper elements: For the second connector 14 located between two adjacent interconnects, along the first direction X: the portion of the width of the second connector 14 that decreases from large to small is roughly evenly distributed between the two adjacent interconnects, indicating that the positional distribution of the bonding force, current collection effect and microcrack gradual improvement between the two adjacent interconnects is relatively symmetrical, thus resulting in a better effect on the bonding force, current collection and microcrack improvement between the two adjacent interconnects 104.

[0057] For example, Figure 7 In the above, the bus electrode may include a connecting line 1022, and the connecting line 1022 contains silver and copper elements: For the second connector 14 located between two adjacent interconnects, along the first direction X: the width of the second connector 14 decreases from large to small in four parts, which are roughly evenly distributed between the two adjacent interconnects 104.

[0058] In some embodiments, refer to Figure 7 Regarding the bus electrode, which may include a connecting line 1022 containing silver and copper elements: For the second connector 14 located between two adjacent interconnects, in the first direction X: the maximum width d2 of the second connector 14 is 0.1 mm to 0.5 mm. If the maximum width d2 of the second connector 14 is too small, its effect on improving bonding strength, current collection, and microcrack prevention in the first direction X is poor. If the maximum width d2 of the second connector 14 is too large, it will lead to material waste. Furthermore, the size of the electrical connector 60 exposed by the second connector 14 in the first direction X may be large. Without the coverage of the electrical connector 60, the second connector 14, due to its organic components, is prone to cracking during drying or heating, potentially causing a short circuit risk. Therefore, in this application, d2 is within the above range, which provides better improvement in bonding strength, current collection, and microcrack prevention, without causing material waste, and also reduces the risk of short circuits.

[0059] For example, Figure 7 In the middle, d2 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, or 0.5mm.

[0060] Figure 5 This is a cross-sectional schematic diagram showing the location of the busbar electrode in the solar cell. In some embodiments, the busbar electrode may include a connecting wire 1022, see reference. Figure 5 and Figure 10The battery body 101 has a first electrode structure and a second electrode structure on one side. The first electrode structure and the second electrode structure have different polarities; one is a P electrode structure and the other is an N electrode structure, indicating that the battery cell is a back-contact battery cell. In a back-contact battery cell, all electrode structures are arranged on the back side of the battery cell, with no obstruction on the front or light-facing side, maximizing light absorption. Due to the reduced light loss from shading, the photoelectric conversion efficiency of the battery cell is higher than that of traditional batteries. For example, the efficiency of a back-contact battery cell can typically reach 25% (the specific efficiency depends on the technology and materials). Back-contact battery cells reduce the impact of microcracks in the front electrodes, making them more durable and reliable in appearance. The absence of electrode structures on the front side of the back-contact battery cell results in a unified and aesthetically pleasing appearance, making it very suitable for building-integrated photovoltaics (BIPV) and high-end applications. However, because both the positive and negative electrode structures of the back-contact solar cell are concentrated on the back side, a larger amount of electrode paste is used on the back side, resulting in higher stress on one side. Therefore, greater tensile strength and better current collection (shorter current collection path or better conductive material) are required at the welding end. In this application, a second connector 14 is provided at the bus electrode in a non-interconnected location to increase welding tensile strength and improve current collection, thereby enhancing module power and reliability. The bus electrode (connecting line 1022) is continuously provided between two opposite edge interconnects along the second direction Y and is connected to a current collector electrode of the same polarity. For example, Figure 10 In the middle, the connecting line away from Y is electrically connected to the first collector electrode 1031 of the same polarity, so as to realize the current collection of the first collector electrode 1031. Figure 10 In the middle, the end wire can be a harpoon wire.

[0061] In some embodiments, the bus electrode may include a connecting wire 1022 and a back contact cell, as described above. Figure 5 In this photovoltaic module, the current collectors of opposite polarities are continuously arranged at the current collector. Where the current collector is interrupted in the battery body, carriers or current cannot be effectively collected, resulting in a dead zone. The continuous arrangement of the current collectors of opposite polarities at the current collector reduces this dead zone and improves battery efficiency. In this application, the photovoltaic module also includes an insulating layer 15, at least disposed in the current collectors of opposite polarities, with the portion intersecting the current collector on the side furthest from the battery body 101. Figure 5 In the diagram, the opposite-polarity current collector at the location of the bus electrode is covered by the insulating layer 15 and is not shown. The insulating layer 15 prevents contact between the opposite-polarity current collector and the bus electrode, thus avoiding short circuits. The bus electrode is located on the side of the same-polarity current collector (the current collector not covered by the insulating layer 15) and the side of the insulating layer 15 covering the opposite-polarity current collector, away from the battery body. The insulating layer 15 only needs to provide good physical insulation, and its specific material is not limited. For example, it can be insulating adhesive.

[0062] Regarding the scheme where the bus electrode can include a connecting line 1022 and a back contact cell, an example is provided where the opposite polarity current collectors are continuously disposed at the bus electrode and a back contact cell is provided. This example does not limit the type of cell in this application, but is only an example to further explain this application. The battery body can include an N-type silicon substrate. The front side of the N-type silicon substrate is covered with a silicon nitride and an aluminum oxide antireflection layer, and the back side of the N-type silicon substrate includes a first conductive region and a second conductive region. At least the first conductive region is provided with a tunneling oxide layer and an N-type doped polycrystalline silicon in sequence, with the tunneling oxide layer located between the N-type silicon substrate and the N-type doped polycrystalline silicon. At least the second conductive region is provided with a P-type doped layer, which can be intrinsic amorphous silicon and P-type doped amorphous silicon in sequence, with the intrinsic amorphous silicon located between the N-type silicon substrate and the P-type doped amorphous silicon. The back of the N-type doped polysilicon and P-type doped layer is covered with a transparent conductive layer (such as ITO). After the entire ITO layer is fabricated, the ITO is etched at the edge of the N-type doped polysilicon to form an isolation region between the NP doped layers (this battery body can be the battery body of a back-contact hybrid HBC battery). After the isolation region is fabricated, Ag, AgCu, or Cu metal grid lines are simultaneously printed on the ITO in the NP doped region to form a PN current collector electrode, which is used to extract the current collected in the PN doped region. The width of the N-type current collector electrode is between 20 μm and 100 μm, and the width of the P-type current collector electrode is between 30 μm and 150 μm. The current collector electrodes are continuously set at the subsequent bus electrode or solder strip positions. After the current collector electrode is fabricated, insulating adhesive is selectively applied to the subsequent bus electrode or solder ribbon locations. The principle for insulating adhesive application is as follows: all ITO above the dissimilar current collector electrode and the dissimilar doped layer must be completely covered. The width of the insulating adhesive printing follows the width of the ITO deposited above the doped layer. The width of the insulating adhesive covering the N-type current collector electrode can be between 400 μm and 450 μm, and the width of the insulating adhesive covering the P-type current collector electrode can be between 600 μm and 680 μm. The length of the insulating adhesive can be between 3 mm and 5 mm. After the insulating adhesive printing is completed, bus electrode printing is performed at the subsequent bus electrode or solder ribbon locations. The bus electrode is printed along the second direction, covering the current collector electrode to be discharged and the insulating adhesive, forming a floating bus electrode. The width of the floating bus electrode can be between 0.2 mm and 1 mm, with interconnects distributed approximately evenly. The dimensions of the interconnects can be between 0.8 mm and 1.2 mm in length and between 1 mm and 1.2 mm in width. The width of the bus electrode is mainly affected by the cost of metallization. When using precious metals (silver and copper) to prepare the bus electrode, cost factors are taken into consideration, and the width of the bus electrode will be close to or less than 0.2 mm. A first connector 11 is set on the top of the floating bus electrode and on the interconnection part, and a second connector 14 is set between the interconnection parts. After the connector is printed, serial soldering, stacking, lamination and other processes can be performed to make the finished component.

[0063] In the aforementioned back-contact solar cell, due to the characteristic that the positive and negative electrodes are concentrated on the back side, they need to be simultaneously led out on the same side, requiring exposed electrodes. The non-exposed, opposite-shaped current collector electrodes are covered with insulating adhesive (due to the characteristics of the ITO on the back side of the aforementioned back-contact solar cell, the entire opposite-shaped doped region needs to be included). After the opposite-shaped current collector electrodes are covered with insulating adhesive, a bus electrode along the second direction is suspended and printed to collect the current from the led-out current collector electrodes. The width of the suspended bus electrode is affected by material costs, and the actual printing width of precious metal materials (silver and copper) is affected by cost. Due to the impact of the current flow, the overall width is relatively narrow, and the width of the connecting line can be around 100μm to 200μm. This results in a weakening of the transmission capacity and a high requirement for the tensile strength of the interconnect. Therefore, in this solution, a second connector is provided in the non-interconnect area of ​​the bus electrode or connecting line. The width of the bus electrode in this solution is between 0.12mm and 1.2mm (the silver-copper bus electrode solution is closer to 0.12mm, and the copper bus electrode solution is closer to 1.2mm), thereby achieving the purpose of assisting current convergence and helping to fix the electrical connector in the interconnect.

[0064] In some embodiments, the bus electrode may include a connecting wire 1022 and a back contact cell, as described above. Figure 10 The opposite polarity current collector electrode is disconnected near the bus electrode. In this type of back contact cell, insulation is mainly achieved through the disconnection of the opposite polarity current collector electrode. It should be noted that, to further improve the insulation effect, an insulating layer 15 is also provided at the disconnection location of the opposite polarity current collector electrode.

[0065] In some embodiments, refer to Figure 4 , Figures 13 to 18 The busbar electrode connects to the edge interconnect 1041 and extends from the edge interconnect 1041 to the edge of the battery body. That is, the busbar electrode includes an end line 1021. The second connector 14 is disposed on the edge interconnect 1041 near the edge of the battery body. The edge interconnect 1041 near the edge of the battery body is typically the starting point for the connection between the battery cells and electrical connectors. The connection effect at this location has a significant impact on the connection stability and reliability of the battery cells and electrical connectors, as well as the current collection effect. In this application, the second connector is disposed on the edge interconnect 1041 near the edge of the battery body, further enhancing the connection effect at this location and further improving the connection reliability, stability, and current collection effect.

[0066] More specifically, Figure 11 It is an EL (electroluminescent) image where no second connector is provided on the end line. Figure 12 This is an EL image of the end line in this application where a second connector is provided. Figure 11 and Figure 12 Both are for the same type of solar cell. Through comparison... Figure 11 and Figure 12 It can be concluded that Figure 11 Mid-end line ( Figure 11 The area around the location of the black line in the middle appears dark and gloomy, while... Figure 12 In the middle, the end line ( Figure 12 There is no obvious darkening or fading near the location of the black line in the middle. Specifically, in this application, a second connector is set at the end line position and the electrical connector is extended. The electrical connector is used for current collection to assist in current collection in the end line area. At the same time, after setting the second connector, the current of the collecting electrode in contact with the second connector is directly conducted through the second connector without being conducted to the edge interconnection part, reducing the current transmission path and further improving the performance of the photovoltaic module.

[0067] For a scheme where the bus electrode can include an end line, an example is provided by setting a second connector on the end line. This example does not limit the type of battery cell in this application, but is only used as an example to further explain this application. As mentioned above, the battery body can also be the battery body of a back-contact hybrid battery. In this scheme, the dimensions of the interconnect portion can be 1mm to 1.2mm in length and 0.8mm to 1.2mm in width. After the current collector electrode, end line, and edge interconnect portion are prepared, insulating adhesive is selectively covered at the subsequent solder ribbon welding positions to cover the opposite current collector electrodes, so as to guide the current of the same polarity current collector electrode that needs to be collected, and to avoid the effect of recombination. After the insulating adhesive is printed, connectors are printed at each same polarity current collector electrode that needs to guide the current at the subsequent solder ribbon welding positions, so as to form a conductor for the subsequent current collector electrode to converge to the electrical connector. The dimensions of the first connector on the interconnect portion can be equal to or adjusted according to the dimensions of the interconnect portion. After the connector is printed, string welding, stacking welding, lamination and other processes can be performed to produce the finished component. For details not covered here, please refer to the aforementioned records. To avoid repetition, further details will not be provided.

[0068] In some embodiments, for bus electrodes that may include terminal wires, and in embodiments where a second connector is provided on the terminal wires, the bus electrode may include a copper bus electrode, meaning the metal element of the terminal wire is primarily copper. (Refer to...) Figure 4 The width d1 of the bus electrode or terminal wire is between 0.1mm and 0.5mm. If d1 is too large, it may be wasteful; if d1 is too small, the contact area with the second connector is too small, resulting in poor improvement in bonding strength and current collection effect. Therefore, d1 within the above range not only avoids waste but also effectively improves bonding strength and current collection effect. For example, d1 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, or 0.5mm.

[0069] In some embodiments, the bus electrode may include a terminal wire, on which a second connector is provided. The bus electrode may also include a copper bus electrode, as described in the following embodiments. Figures 13 to 18 For the second connector 14 located on the edge of the edge interconnect near the edge of the battery body: for a single end wire 1021, the number of second connectors 14 is greater than or equal to 3. Since the length of the end wire 1021 is relatively long, such as 5.5mm to 7mm, the number of second connectors 14 is also relatively large, further improving the bonding strength, current collection effect, and reducing microcracks. For example, Figure 13 and Figure 14 In this example, the number of second connectors 14 on a single end wire 1021 is four. For another example, Figures 15 to 16 In this example, the number of second connectors 14 on a single end wire 1021 is 6 or 7. Alternatively, the number of second connectors 14 on a single end wire 1021 may be 3, 4, 5, 6, 7, 8, 9, or 10.

[0070] In some embodiments, the bus electrode may include a terminal wire, on which a second connector is provided. The bus electrode may also include a copper bus electrode, as described in the following embodiments. Figures 13 to 18 Regarding the second connector 14 located on the edge of the edge interconnection section near the edge of the battery body: for a single end line 1021, the second connector 14 and the adjacent edge interconnection section 1041 are distributed at intervals. With the same amount of second connector 14, the second connector 14 covers a wider range and has a wider range of improvement in bonding force, current collection effect and microcracks.

[0071] In some embodiments, the bus electrode may include a terminal wire, on which a second connector is provided. The bus electrode may also include a copper bus electrode, as described in the following embodiments. Figures 13 to 18 Regarding the second connector 14 located on the edge of the edge interconnection section near the edge of the battery body: for a single end line 1021, adjacent second connectors are spaced apart. Similarly, with the same amount of second connectors 14, the coverage of the second connectors 14 is wider, resulting in a wider range of improvement in bonding strength, current collection effect, and microcracks.

[0072] In some embodiments, the bus electrode may include a terminal wire, on which a second connector is provided. The bus electrode may also include a copper bus electrode, as described in the following embodiments. Figures 13 to 18Regarding the second connector 14 located on the edge of the edge interconnect near the edge of the battery body: for a single end line 1021, the spacing between adjacent second connectors is equal, resulting in a more balanced effect on bonding strength, current collection efficiency, and microcrack reduction at various locations on the end line 1021. This equal spacing includes absolute equality as well as equality with a certain margin of error. For example, for a single end line 1021, if the ratio of the difference between the maximum and minimum spacing of adjacent second connectors 14 to the minimum spacing is less than or equal to 10%, this can be considered as equality at that point.

[0073] In some embodiments, the bus electrode may include a terminal wire, on which a second connector is provided. The bus electrode may also include a copper bus electrode, as described in the following embodiments. Figures 13 to 18 For the second connector 14 located on the edge of the edge interconnection section near the edge of the battery body: the second connector 14 is spaced from the edge of the battery body, reducing the risk of hidden cracks at the edge of the battery body.

[0074] In some embodiments, the bus electrode may include a terminal wire, on which a second connector is provided. The bus electrode may also include a copper bus electrode, as described in the following embodiments. Figures 13 to 18 In the second direction Y: the current collector electrode located at the edge of the battery body is the edge current collector electrode, and the second connector 14 is located inside the edge current collector electrode, which can further reduce the risk of microcracks at the edge of the battery body.

[0075] For example, Figure 15 and Figure 16 The back contact cell shown has a first collector electrode 1031 and a second collector electrode 1032 alternately distributed along the second direction Y. That is, along the second direction Y, a first collector electrode 1031 is followed by a second collector electrode 1032, and then another first collector electrode 1031 is distributed alternately. Figure 15 In the middle, the edge collector electrode is the second collector electrode 1032. On the side where the edge collector electrode is located, the second connector provided on the end line 1021 that is electrically connected to the edge collector electrode does not extend beyond the edge collector electrode. Figure 16 In this design, the edge current collector electrode is the second current collector electrode 1032. On the side where this edge current collector electrode is located, a second connector is provided on the end line 1021 that is electrically connected to the first current collector electrode 1031 adjacent to the edge current collector electrode, and does not extend beyond the edge current collector electrode. It should be noted that the back contact cell here is only schematic; the second connector 14 is located inside the edge current collector electrode and is applicable to both back contact cells and bifacial cells.

[0076] In some embodiments, the bus electrode may include an end wire, on which a second connector is provided. The bus electrode may include a copper bus electrode. Regarding the second connector 14 located on the edge interconnect near the edge of the battery body: See [reference needed]. Figure 13 The width d2 in the first direction X is 0.1mm to 0.4mm, and the length W1 in the second direction Y is 0.5mm to 0.6mm. In the second direction Y, the spacing between adjacent second connectors 14 is 0.2mm to 0.3mm. With d2, W1, and the spacing set within the above ranges, a good balance is achieved in terms of bonding force, current collection effect, and improvement of microcracks. Furthermore, the probability of the second connector 14 leaking out of the electrical connector 60 is low, and the risk of short circuit is low. For example, d2 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, or 0.4mm. For example, W1 can be 0.5mm, 0.51mm, 0.52mm, 0.55mm, 0.57mm, 0.59mm, or 0.6mm. The spacing can be 0.2mm, 0.21mm, 0.22mm, 0.25mm, 0.26mm, 0.28mm, or 0.3mm. It should be noted that, Figure 13 In the middle, the length W1 along the second direction Y is larger, and the improvement range of bonding force, current collection and microcracks is wider.

[0077] In some embodiments, the bus electrode may include an end wire, on which a second connector is provided. The bus electrode may include a copper bus electrode. Regarding the second connector 14 located on the edge interconnect near the edge of the battery body: See [reference needed]. Figure 14 The width d2 in the first direction X is 0.5mm to 0.7mm, and the length W1 in the second direction Y is 0.2mm to 0.4mm. In the second direction Y, the spacing between adjacent second connectors 14 is 0.5mm to 0.6mm. With d2, W1, and the spacing set within the above ranges, a good balance is achieved in terms of bonding force, current collection effect, and improvement of microcracks. Furthermore, the probability of the second connector 14 leaking the electrical connector 60 is low, and the risk of short circuit is low. For example, d2 can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.68mm, or 0.7mm. For example, W1 can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.39mm, or 0.4mm. The spacing can be 0.5mm, 0.51mm, 0.52mm, 0.55mm, 0.56mm, 0.58mm, or 0.6mm. It should be noted that... Figure 14 In the middle, the width d2 along the first direction X is relatively large, which can further accommodate the positional deviation of the electrical connector.

[0078] In some embodiments, the bus electrode may include an end line, on which a second connector is provided. The bus electrode may include a copper bus electrode. For the second connector 14 located on the edge interconnect near the edge of the cell body: the one-dimensional dimension (length W1, width d2) of the second connector on the N-type bus electrode is 100 μm to 320 μm, and / or the one-dimensional dimension (length W1, width d2) of the second connector on the P-type bus electrode is 180 μm to 280 μm, which matches the parameters of the N-type doped layer and the P-type doped layer in the cell, and can further improve the performance of the photovoltaic module. The N-type bus electrode is connected to the N-type current collector electrode, and the P-type bus electrode is connected to the P-type current collector electrode. For example, for the aforementioned back-contact hybrid battery, the one-dimensional dimensions (length W1, width d2) of the second connector on the N-type bus electrode can be 100μm, 120μm, 150μm, 180μm, 200μm, 230μm, 250μm, 280μm, 300μm, or 320μm, and the one-dimensional dimensions (length W1, width d2) of the second connector on the P-type bus electrode can be 180μm, 190μm, 200μm, 220μm, 250μm, or 280μm.

[0079] In some embodiments, the bus electrode may include a terminal wire with a second connector disposed on the terminal wire. The bus electrode may include a copper bus electrode. Along the second direction Y, the length of the terminal wire in the bus electrode may be 5.5 mm to 6 mm. For example, the length of the terminal wire in an N-type bus electrode may be less than or equal to the length of the terminal wire in a P-type bus electrode. As further examples, the length of the terminal wire in the bus electrode may be 5.5 mm, 5.53 mm, 5.53 mm, 5.68 mm, 5.7 mm, 5.73 mm, 5.75 mm, 5.78 mm, 5.88 mm, or 6 mm.

[0080] In some embodiments, the bus electrode may include a terminal wire, on which a second connector is provided. The bus electrode may also include a copper bus electrode, as described in the following embodiments. Figures 15 to 18 The battery body has a first electrode structure and a second electrode structure on one side. The first electrode structure and the second electrode structure have different polarities. This battery cell is a back-contact battery cell, which can be referred to the aforementioned relevant content. To avoid repetition, it will not be repeated here. The same battery string includes: one A battery cell and one B battery cell distributed adjacent to each other along the second direction Y. Figure 17The diagram illustrates an adjacent A-cell and a B-cell distributed along the second direction Y in a battery string. In this adjacent A-cell and B-cell distribution along the second direction Y, the second connector 14 on the bus electrode (end line) of the A-cell and the second connector 14 on the bus electrode (end line) of the B-cell are symmetrically distributed, with the axis of symmetry parallel to the first direction X. This axis of symmetry can be considered as the centerline between the A-cell and B-cell in the second direction Y, which is parallel to the first direction X. In the battery string, the adjacent A-cell and B-cell distribution along the second direction Y is repeated. The symmetry mentioned in this application can refer to absolute symmetry or approximate symmetry.

[0081] In a battery cell A and a battery cell B that are adjacently distributed along the second direction Y, the battery cell A is on the same side of the second direction Y (e.g., Figure 17 In two adjacent bus electrodes (end lines 1021) (both close to the Y side): the distribution length of the second connector 14 on one bus electrode (end line 1021) along the second direction Y (the distance between the two opposite endpoints of all the second connectors 14 on this bus electrode as a whole in the second direction Y) is greater than the distribution length of the second connector on the other bus electrode (end line 1021) along the second direction, thus matching the series connection of electrode structures with different polarities of the back-contacting cells in the same battery string. It should be noted that wherever there is a second connector 14 on the end line, it is basically covered by the electrical connector 60, and the two achieve electrical connection to realize the conduction of current.

[0082] In some embodiments, refer to Figures 15 to 18 In two adjacent bus electrodes (end lines 1021) on the same side of cell A in the second direction Y: one bus electrode (end line 1021) has a second connector 14, while the other bus electrode (end line 1021) does not have a second connector 14, thus matching the series connection of electrode structures with different polarities of the back-contact cells in the same cell string. It should be noted that, similarly, wherever there is a second connector 14 on the end line, it is basically covered by the electrical connector 60, achieving electrical connection and enabling current conduction. Regarding... Figures 15 to 18 The electrical connectors are connected across the battery cells via a second connector 14 on the end line.

[0083] In some embodiments, based on the aforementioned A and B battery cells in the same battery string, among the two bus electrodes of the A battery cell collinear along the second direction Y: the distribution length of the second connector on one bus electrode along the second direction (the distance between two opposite endpoints of all the second connectors 14 on that bus electrode as a whole in the second direction Y) is greater than the distribution length of the second connector on the other bus electrode along the second direction; or, one bus electrode has a second connector, and the other bus electrode does not have a second connector, thereby matching the series connection of electrode structures of different polarities of the back-contact battery cells in the same battery string. It should be noted that, similarly, wherever there is a second connector 14 on the end line, it is basically covered by the electrical connector 60, and the two achieve electrical connection to realize current conduction. Figures 15 to 18 The electrical connectors are connected across the battery cells via a second connector 14 on the end line. Figures 15 to 18 In the case of cell A, among the two bus electrodes that are collinear along the second direction Y: one bus electrode is provided with a second connector 14, while the other bus electrode is not provided with a second connector.

[0084] In some embodiments, based on the presence of the aforementioned battery cell A and battery cell B in the same battery string, referring to Figure 2 In a photovoltaic module, two battery strings (string A and string B) are symmetrically arranged, with their axis of symmetry parallel to the second direction Y, to match the aforementioned corresponding battery strings and achieve series connection of the two battery strings. Here, the axis of symmetry is located at the midline of the two battery strings in the first direction X, and the extension direction of this midline is parallel to the second direction Y. For example, Figure 2 In the process, in string A and string B, string A needs to export the electrical connector from the P-type electrode structure, while string B, under the same conditions, mirrors and flips the electrical connector to export the N-type electrode structure.

[0085] In some embodiments, refer to Figure 1 The photovoltaic module also includes a backsheet 50, which can be made of glass or other materials, without limitation. The backsheet 50 is located on the back-light side of the cell string, and has lead-out holes (located at position 13), as shown in the reference diagram. Figure 3 The electrical connector 60 is offset from the lead-out hole to avoid interference with the setting of the structure corresponding to the lead-out hole.

[0086] In some embodiments, a second connector on the bus electrode is connected to a current collector electrode electrically connected to the bus electrode. This connection can be direct or indirect. By connecting the second connector to the current collector electrode electrically connected to the bus electrode, the current on the current collector electrode can also be led out to the electrical connector through the second connector. This increases the current collection path on the current collector electrode and reduces the current transmission distance, further optimizing the performance of the photovoltaic module. These features apply to both back-contact cells and bifacial cells.

[0087] For example, refer to Figures 13 to 16 The second connector on the bus electrode is connected to the collector electrode that is electrically connected to the bus electrode.

[0088] In some embodiments, the projection of the centerline of the second connector on the bus electrode extending along the first direction onto the plane of the battery cell at least partially coincides with the current collector electrically connected to the bus electrode. This indicates that in the second direction Y, the second connector on the bus electrode is approximately symmetrically arranged with respect to the current collector electrically connected to the bus electrode, which can sufficiently ensure the electrical connection between the second connector and the current collector, improve the current transmission path, and reduce the current transmission distance on the current collector.

[0089] In some embodiments, the first connector and the second connector are made of the same material, and thus they can be formed in the same process. The second connector does not require additional process steps, which can reduce production costs.

[0090] In some possible embodiments, the material of the second connector includes conductive adhesive, which can, on the one hand, play a certain role in pre-fixing the electrical connector and the battery cell to prevent misalignment before electrical connection, and on the other hand, the material can also play a good role in supplementing the electrical connection tension between the electrical connector and the battery body.

[0091] In some possible embodiments, the one-dimensional dimension of the first connector 11 on the edge interconnect 1041 is greater than or equal to 0.8 mm and less than or equal to 1.3 mm. The edge interconnect 1041 is the starting point for the connection between the battery cell and the electrical connector, and the connection effect at this location has a significant impact on the connection effect between the battery cell and the electrical connector. Therefore, in this application, the one-dimensional dimension of the first connector 11 on the edge interconnect 1041 is relatively large, which has a greater promoting effect on the connection effect between the battery cell and the electrical connector. At the same time, the one-dimensional dimension of the first connector is not too large to avoid the risk of leakage caused by the first connector leaking out from the edge interconnect. In this application, the one-dimensional dimension can refer to length and width, with the length along the second direction and the width along the first direction.

[0092] For example, the one-dimensional dimension of the first connector 11 on the edge interconnect 1041 can be approximately (0.8 mm to 1 mm) × (0.9 mm to 1.3 mm).

[0093] In some possible embodiments, the interconnection portion further includes: an intermediate interconnection portion 1042 located inside the edge interconnection portion 1041 in the second direction Y, wherein the one-dimensional dimension of the intermediate interconnection portion 1042 is less than or equal to the one-dimensional dimension of the edge interconnection portion 1041; the one-dimensional dimension of the first connector 11 on the intermediate interconnection portion 1042 is greater than or equal to 0.7 mm and less than or equal to 1.2 mm. The one-dimensional dimension of the first connector 11 on the intermediate interconnection portion 1042 is not too small, which greatly promotes the connection effect of the battery cell and the electrical connector. At the same time, the one-dimensional dimension of the first connector is not too large, so as to avoid the risk of leakage caused by the first connector leaking out from the intermediate interconnection portion.

[0094] For example, the one-dimensional dimension of the first connector 11 on the intermediate interconnect portion 1042 can be approximately (0.7 mm to 1.2 mm) × (0.7 mm to 1.2 mm). The length of the first connector 11 on the intermediate interconnect portion 1042 can be equal to its width.

[0095] In some possible embodiments, when the connector leaks from the electrical connector, the one-dimensional dimension of the portion of the connector from which the electrical connector is exposed is less than or equal to 200 μm. Here, the connector refers to the first connector and / or the second connector, and leakage from the electrical connector means that the connector leaks from the electrical connector in the first direction X and / or the second direction Y. Specifically, connectors typically contain organic components, which are prone to cracking during drying or heating, potentially leading to short circuits. Therefore, in this application, a one-dimensional dimension of the portion of the connector from which the electrical connector is exposed is less than or equal to 200 μm, which effectively improves bonding strength, current collection, and reduces microcracks, without causing material waste, and also minimizes the risk of short circuits.

[0096] For example, when the connector protrudes from the electrical connector, the one-dimensional dimension of the portion of the connector from which the electrical connector protrudes can be 200μm, 180μm, 150μm, 120μm, 100μm, 70μm, 50μm, 20μm, 10μm, 5μm, 1μm, or 0.2μm.

[0097] This application also provides a method for preparing a photovoltaic module, which can prepare any of the aforementioned photovoltaic modules. The method may include the following steps.

[0098] Step S1, providing a battery cell, the battery cell comprising: a battery body, and an electrode structure located on at least one side of the battery body; the electrode structure comprising: a plurality of current collector electrodes, a plurality of current bus electrodes, and a plurality of interconnects, the current collector electrodes all extending along a first direction and spaced apart along a second direction, the first direction being perpendicular to the second direction; the current bus electrodes extending along the second direction and electrically connected to the current collector electrodes of the same polarity; the interconnects electrically connected to the current collector electrodes of the same polarity; among the plurality of interconnects, the interconnects located along the second direction at the edge of the battery body are edge interconnects; the current bus electrodes at least comprise copper; the current bus electrodes connect to the edge interconnects and extend from the edge interconnects toward the edge of the battery body, and / or, the current bus electrodes are located between two edge interconnects opposite each other along the second direction.

[0099] Step S2: A first connector is provided on the side of the interconnection portion away from the battery body, and a second connector is provided on the side of the bus electrode away from the battery body; the first connector and the second connector are provided in the same process.

[0100] Reference Figure 8 or Figure 9 The first connector and the second connector are installed in the same process, which can simplify the process steps, save process cycle time, and improve production efficiency.

[0101] Step S3: An electrical connector is provided on the side of the first connector and the second connector away from the battery body.

[0102] In some embodiments, refer to Figure 8 or Figure 9 In step S2, providing a first connector on the side of the interconnect portion away from the battery body may include: printing at least two first connector precursors 16 on the side of the edge interconnect portion away from the battery body, and printing one first connector precursor 16 on the side of the interconnect portion (i.e., the middle interconnect portion) away from the battery body outside the edge interconnect portion. (Refer to...) Figure 4 , Figure 6 and Figure 7At least two first connector precursors on the edge interconnect are fused into a single first connector during the process of setting the electrical connector (e.g., welding). Specifically, because the cell strings move during module manufacturing and stacking, the edge interconnect is at a higher risk of stress, and it is also the starting point for the connection between the cell and the electrical connector, thus requiring higher tensile strength from the edge interconnect. In this application, if an excessively large mesh is provided at the corresponding position of the edge interconnect in the printing screen of the connector, the screen manufacturing difficulty and screen life are easily affected. Therefore, at least two spaced first connector precursors 16 are designed at the corresponding position of the edge interconnect to reduce the screen manufacturing difficulty and improve the screen life.

[0103] In some embodiments, providing a second connector on the side of the busbar electrode away from the battery body may include: printing a second connector precursor 16 on the side of the busbar electrode away from the battery body, wherein the second connector precursor 16 solidifies to form the second connector. Similar to the foregoing... Figure 7 Correspondingly, for the silver-copper busbar electrode, in the process of setting the electrical connector, the second connector has a leveling effect. Therefore, the position where the precursor of the second connector is printed is the position with a larger width in the second connector, and the position on the second busbar electrode where the precursor of the second connector is not printed is the position with a smaller width. Figure 7 In the first direction Y: the number of parts in the second connector whose width decreases from large to small is greater than or equal to 2, which can correspond to the number of second connector precursors printed on a second bus electrode being greater than or equal to 2.

[0104] It should be noted that the photovoltaic modules and photovoltaic module preparation methods provided in this application can be referred to each other and can achieve the same or similar beneficial effects. In order to avoid repetition, they will not be described again.

[0105] It should be noted that the various embodiments provided in this application can be used individually or in combination without contradiction, and all are within the protection scope of this application.

[0106] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0107] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "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 based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0108] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0109] 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., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0110] Although embodiments of this application 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 this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, comprising: A plurality of battery strings; the battery strings include electrical connectors and a plurality of battery cells, the electrical connectors being electrically connected to adjacent battery cells; The solar cell includes: a solar cell body, and an electrode structure located on at least one side of the solar cell body; the electrode structure includes: a plurality of current collector electrodes, a plurality of current bus electrodes, and a plurality of interconnects, wherein the current collector electrodes all extend along a first direction and are spaced apart along a second direction, the first direction being perpendicular to the second direction; the current bus electrodes extend along the second direction and are electrically connected to the current collector electrodes of the same polarity; the interconnects are electrically connected to the current collector electrodes of the same polarity; among the plurality of interconnects, the interconnects located at the edge of the solar cell body along the second direction are edge interconnects; characterized in that the photovoltaic module further includes: A plurality of first connectors and a plurality of second connectors; the electrical connectors are electrically connected to the electrode structure via the first connectors and the second connectors; The first connector is disposed on the side of the interconnect portion away from the battery body; the second connector is disposed on the side of the bus electrode away from the battery body; The busbar electrode comprises at least copper; the busbar electrode connects to the edge interconnect and extends from the edge interconnect toward the edge of the battery body; and / or the busbar electrode is located between two edge interconnects that are opposite each other along the second direction.

2. The photovoltaic module according to claim 1, characterized in that, The bus electrode is located between two opposite edge interconnects along the second direction, wherein the second connector is disposed between two adjacent interconnects.

3. The photovoltaic module according to claim 2, characterized in that, The bus electrode comprises a copper bus electrode with a width of 0.5 mm to 1.2 mm.

4. The photovoltaic module according to claim 3, characterized in that, For the second connector located between two adjacent interconnecting parts: The number of second connectors between two adjacent interconnecting parts is greater than or equal to 1; and / or, The second connector and the adjacent interconnecting portions are spaced apart; and / or, When the number of second connectors between two adjacent interconnecting parts is greater than 1, the adjacent second connectors are spaced apart; and / or, In the first direction: the width of the bus electrode is greater than or equal to the width of the second connector, and / or, the width of the second connector is greater than or equal to the width of the electrical connector; and / or, The second connector is distributed roughly evenly between two adjacent interconnects.

5. The photovoltaic module according to claim 3 or 4, characterized in that, In the first direction, the width of the second connector is 0.5 mm to 0.9 mm; and / or, In the second direction, the length of the second connector is 0.5 mm to 0.9 mm.

6. The photovoltaic module according to claim 2, characterized in that, The bus electrode comprises a silver-copper bus electrode with a width of 0.1 mm to 0.4 mm.

7. The photovoltaic module according to claim 6, characterized in that, For the second connector located between two adjacent interconnecting parts: Along the second direction, the second connector connects at least one of the two adjacent interconnect portions; and / or, Along the first direction: the second connector has a portion where the width decreases; and / or, Along the first direction: the maximum width of the second connector is greater than or equal to the width of the electrical connector, and / or the maximum width of the electrical connector is greater than or equal to the width of the bus electrode.

8. The photovoltaic module according to claim 7, characterized in that, Along the first direction: the number of portions in the second connector whose width decreases from large to small is greater than or equal to 2; and / or, In the second connector, the portion whose width decreases from large to small is roughly evenly distributed between two adjacent interconnecting portions.

9. The photovoltaic module according to claim 7 or 8, characterized in that, Along the first direction: the maximum width of the second connector is 0.1 mm to 0.5 mm.

10. The photovoltaic module according to any one of claims 2 to 9, characterized in that, The battery body has a first electrode structure and a second electrode structure on one side, and the first electrode structure and the second electrode structure have different polarities; the current collector electrode is continuously disposed between two edge interconnections that are opposite to each other along the second direction, and is connected to the current collector electrode of the same polarity; The current collectors of opposite polarities are continuously disposed at the current collector. The photovoltaic module further includes: an insulating layer, at least disposed in the current collectors of opposite polarities, with the portion intersecting the current collector on the side away from the battery body; the current collector is disposed on the side of the current collectors of the same polarity and the insulating layer away from the battery body; or, The current collector of opposite polarity is disconnected near the bus electrode.

11. The photovoltaic module according to claim 1, characterized in that, The bus electrode is connected to the edge interconnect and extends from the edge interconnect toward the edge of the battery body, wherein the second connector is disposed on the edge interconnect near the edge of the battery body.

12. The photovoltaic module according to claim 11, characterized in that, The bus electrode comprises a copper bus electrode with a width of 0.1 mm to 0.5 mm.

13. The photovoltaic module according to claim 12, characterized in that, Regarding the second connector located on the edge of the edge interconnect near the edge of the battery body: The number of the second connectors is greater than or equal to 3; and / or, The second connector and the adjacent edge interconnects are spaced apart; and / or, Adjacent second connectors are spaced apart; and / or, The spacing between adjacent second connectors is equal; and / or, The second connector and the edge of the battery body are spaced apart; and / or, In the second direction: the current collector electrode located at the edge of the battery body is the edge current collector electrode, and the second connector is located inside the edge current collector electrode.

14. The photovoltaic module according to any one of claims 11 to 13, characterized in that, The second connector has a width of 0.1 mm to 0.4 mm in the first direction and a length of 0.5 mm to 0.6 mm in the second direction; the spacing between adjacent second connectors in the second direction is 0.2 mm to 0.3 mm; or, the second connector has a width of 0.5 mm to 0.7 mm in the first direction and a length of 0.2 mm to 0.4 mm in the second direction; the spacing between adjacent second connectors in the second direction is 0.5 mm to 0.6 mm. And / or, The bus electrode includes an N-type bus electrode and a P-type bus electrode, wherein the one-dimensional dimension of the second connector on the N-type bus electrode is 100 μm to 320 μm, and / or the one-dimensional dimension of the second connector on the P-type bus electrode is 180 μm to 280 μm.

15. The photovoltaic module according to any one of claims 11 to 14, characterized in that, The battery body has a first electrode structure and a second electrode structure on one side, and the first electrode structure and the second electrode structure have different polarities; the same battery string includes: an A battery cell and a B battery cell distributed adjacent to each other along the second direction; In an adjacent A-cell and a B-cell, the second connector on the busbar electrode of the A-cell is symmetrically distributed with the second connector on the busbar electrode of the B-cell, and the axis of symmetry is parallel to the first direction. In the two adjacent busbars on the same side of the A-cell in the second direction: the distribution length of the second connector on one busbar along the second direction is greater than the distribution length of the second connector on the other busbar along the second direction; or, one busbar has a second connector, and the other busbar does not have a second connector; and / or, In the two collinear bus electrodes of the A-cell cell along the second direction: the distribution length of the second connector on one bus electrode along the second direction is greater than the distribution length of the second connector on the other bus electrode along the second direction; or, one bus electrode is provided with the second connector, and the other bus electrode is not provided with the second connector.

16. The photovoltaic module according to claim 15, characterized in that, Two battery strings connected in series are symmetrically distributed, with the axis of symmetry parallel to the first direction.

17. The photovoltaic module according to any one of claims 1 to 16, characterized in that, It also includes a backplate located on the backlight side of the battery string, the backplate having lead-out holes, and the electrical connectors being offset from the lead-out holes.

18. The photovoltaic module according to any one of claims 1 to 17, characterized in that, The second connector on the bus electrode is connected to the current collector electrode electrically connected to the bus electrode; and / or, The projection of the centerline of the second connector on the busbar extending along the first direction onto the plane of the solar cell at least partially coincides with the current collector electrically connected to the busbar; and / or, The first connector and the second connector are made of the same material.

19. The photovoltaic module according to any one of claims 1 to 18, characterized in that, The one-dimensional dimension of the first connector on the edge interconnect portion is greater than or equal to 0.8 mm and less than or equal to 1.3 mm; and / or, The interconnection portion further includes: an intermediate interconnection portion located inside the edge interconnection portion in the second direction, wherein the one-dimensional dimension of the intermediate interconnection portion is less than or equal to the one-dimensional dimension of the edge interconnection portion; the one-dimensional dimension of the first connector on the intermediate interconnection portion is greater than or equal to 0.7 mm and less than or equal to 1.2 mm; and / or, In the case where the connector protrudes from the electrical connector, the one-dimensional dimension of the portion of the connector from which the electrical connector protrudes is less than or equal to 200 μm.

20. A method for preparing a photovoltaic module, characterized in that, include: A battery cell is provided, the battery cell comprising: a battery body, and an electrode structure located on at least one side of the battery body; the electrode structure comprising: a plurality of current collector electrodes, a plurality of current bus electrodes, and a plurality of interconnects, wherein the current collector electrodes extend along a first direction and are spaced apart along a second direction, the first direction being perpendicular to the second direction; the current bus electrodes extend along the second direction and are electrically connected to the current collector electrodes of the same polarity; the interconnects are electrically connected to the current collector electrodes of the same polarity; among the plurality of interconnects, the interconnects located along the second direction at the edge of the battery body are edge interconnects; the current bus electrodes comprise at least copper; the current bus electrodes connect to the edge interconnects and extend from the edge interconnects to the edge of the battery body, and / or, the current bus electrodes are located between two opposite edge interconnects along the second direction; A first connector is provided on the side of the interconnection portion away from the battery body, and a second connector is provided on the side of the bus electrode away from the battery body; the first connector and the second connector are provided in the same process. An electrical connector is provided on the side of the first connector and the second connector away from the battery body.

21. The method for preparing a photovoltaic module according to claim 20, characterized in that, A first connector is provided on the side of the interconnection portion away from the battery body, comprising: At least two first connector precursors are printed on the side of the edge interconnection away from the battery body, and one first connector precursor is printed on the side of the interconnection away from the battery body outside the edge interconnection; the at least two first connector precursors on the edge interconnection are fused into one first connector in the process of setting the electrical connector.

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