Photovoltaic module

Abstract

The application discloses a photovoltaic module, which comprises a plurality of cell strings, each of which comprises a plurality of cell pieces and a connecting piece; each of the cell pieces comprises an electrode structure; the electrode structure comprises a plurality of current collecting electrodes, at least one first connecting piece, at least one second connecting piece and at least one connecting part; the at least one connecting part is electrically connected with the current collecting electrodes of the same polarity; the first connecting piece is located on the side of the connecting part away from the cell body; the second connecting piece is staggered with the connecting part and arranged in a column in a second direction; the first connecting piece and the second connecting piece in the column are electrically connected with the connecting piece in the cell string. In the application, the connecting tension or welding tension between the cell piece and the connecting piece is increased, the welding reliability is improved, and the series resistance is reduced.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic technology, specifically relating to 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] Photovoltaic modules typically use interconnecting components such as solder strips and conductive backsheets to electrically connect multiple cells, such as welding them in series to form a cell string, and further forming a cell string array.

[0004] However, existing photovoltaic modules often suffer from insufficient connection reliability issues in their cell strings or arrays, such as inadequate welding reliability, primarily manifested in low tensile strength between interconnects and cells. Currently, this insufficient connection reliability significantly impacts yield rates. Utility Model Content

[0005] This application aims to provide a photovoltaic module that at least addresses one of the problems of insufficient connection reliability.

[0006] This application provides a photovoltaic module, comprising: A plurality of battery strings; the battery strings include interconnecting elements and a plurality of battery cells, the interconnecting elements being electrically connected to adjacent battery cells; The 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, at least one first connector, at least one second connector, and at least one interconnection portion, each of the current collector electrodes extending along a first direction and spaced apart along a second direction, the current collector electrodes being electrically connected to the battery body, the first direction being different from the second direction; the interconnection portion being electrically connected to the current collector electrodes of the same polarity; The first connector is located on the side of the interconnection portion away from the battery body; The second connector is offset from the interconnection portion, and in the second direction, at least one first connector and at least one second connector are spaced apart and arranged in a row; In the battery string, both the first connector and the second connector in one column are electrically connected to the interconnect.

[0007] In this application, the extension direction of the interconnect is typically along a second direction. In this second direction, both the first and second connectors within a row are electrically connected to the interconnect. The addition of a second connector in the extension direction of the interconnect increases the electrical connection path and contact area between the solar cell and the interconnect, thereby increasing the connection tension (such as welding tension) and significantly reducing weld misalignment issues. This improves electrical connection reliability and yield. Furthermore, the better electrical connection between the solar cell and the interconnect also reduces the series resistance of the photovoltaic module. Additionally, the spaced distribution of the first and second connectors in the second direction disperses the connection stress between the solar cell and the interconnect, reducing the risk of microcracks or breakage in the solar cell and interconnect.

[0008] In some possible embodiments, at least one of the second connectors is located on the side of the current collector electrode away from the battery body. This second connector also provides an additional transport path for charge carriers or current on the current collector electrode in contact with it, improving the current collection effect.

[0009] In some possible embodiments, at least two of the second connectors are spaced apart and arranged in a row in the second direction.

[0010] In some possible embodiments, within a column, the spacing between adjacent first connectors and second connectors is d1; Within a column, the spacing between two adjacent second connectors is d2; d2≤d1.

[0011] In some possible embodiments, the difference between d1 and d2 is 0.3 to 1.5 mm; and / or, d1 is 3 to 5 mm; and / or, d2 is 2.5 to 4 mm.

[0012] In some possible embodiments, within a column, at least one of the first connectors is closer to the edge of the battery body than the second connector.

[0013] In some possible embodiments, in the second direction, the width of the second connector is smaller than the width of the first connector; and / or, In the first direction, the length of the second connector is equal to the length of the first connector; and / or, The height of the second connector is equal to the height of the first connector.

[0014] In some possible embodiments, in the second direction, the difference between the width of the first connector and the width of the second connector is 0.08 to 0.15 mm; and / or, In the second direction, the width of the second connector is 0.2 to 0.4 mm; and / or, In the first direction, the length of the second connector is 0.4 to 0.6 mm; and / or, The height of the second connector is 50 to 250 μm.

[0015] In some possible embodiments, the second connector covers at least a portion of the side of the interconnect.

[0016] In some possible embodiments, the battery cell is a back-contact battery cell, and in the first direction, two adjacent second connectors are spaced apart and staggered.

[0017] In some possible embodiments, the plurality of collector electrodes includes: a plurality of first collector electrodes and a plurality of second collector electrodes, wherein the first collector electrodes and the second collector electrodes have different polarities; Along the second direction, the interconnecting member is electrically connected to the first collector electrode, and an insulating member is provided between the interconnecting member and the second collector electrode; At least one of the second connectors is located on the side of the insulator away from the battery body; and / or, at least one of the second connectors is offset from the insulator.

[0018] In some possible embodiments, the spacing between two adjacent second connectors along the second direction is 0.3 to 1.2 mm.

[0019] In some possible embodiments, the thickness of the battery body is 115 to 135 μm.

[0020] In some possible embodiments, the projected shape of the second connector includes at least one of a circle, an ellipse, or a rectangle; and / or, The material of the second connector includes conductive adhesive.

[0021] In some possible embodiments, the first connector and the second connector are made of the same material. Attached Figure Description

[0022] 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 a front view schematic diagram of a photovoltaic module according to an embodiment of this application; Figure 2 and Figure 3These are two bottom-view schematic diagrams of a photovoltaic module according to embodiments of this application; Figure 4 This is a front view schematic diagram of a photovoltaic module cell string according to an embodiment of this application; Figure 5 This is a front view schematic diagram of the cell string of a photovoltaic module based on related technologies; Figure 6 The aforementioned Figure 2 A magnified view of a portion of the image.

[0023] Figure label: 1-Battery string array, 2-Front encapsulation film, 3-Cover plate, 4-Rear encapsulation film, 5-Back plate, 10-Interconnector, 11-Battery cell, 12-First connector, 13-Second connector, 111-Battery body, 1111-Edge line of battery body, 112-Current collector electrode, 1121-First current collector electrode, 1122-Second current collector electrode, 113-Bucket electrode, 1131-First busbar electrode, 1132-Second busbar electrode, 114-Insulator, 115-Interconnector, 1151-First interconnector, 1152-Second interconnector, 20-Gap. Detailed Implementation

[0024] 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.

[0025] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of those features. Terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used 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.

[0026] This application provides a photovoltaic module, with reference to... Figure 1In the thickness direction of the photovoltaic module, the photovoltaic module includes a cover plate 3, a front encapsulating film 2, a cell string array 1, a rear encapsulating film 4, and a backsheet 5 stacked sequentially. The front encapsulating film 2 and the rear encapsulating film 4 can be made of materials such as ethylene-vinyl acetate copolymer (EVA), and the materials of the front encapsulating film 2 and the rear encapsulating film 4 can be the same or different; there are no limitations on their specific materials. The cover plate 3 can have a certain degree of light transmittance and can be made of glass, etc., and there are no limitations on its specific material. During normal operation of the photovoltaic module, the cover plate 3 is located on the side that mainly receives sunlight.

[0027] A battery string array comprises several battery strings arranged in an array. (See reference...) Figure 2 The battery string includes interconnecting elements 10 and a plurality of battery cells 11. In the battery string, the interconnecting elements connect adjacent battery cells. The interconnecting elements 10 can be solder strips, etc. The number of interconnecting elements 10 and the number of battery cells 11 in the battery string are not limited. (Refer to...) Figure 2 and Figure 3 The solar cell 11 includes a battery body 111 and an electrode structure located on at least one side of the battery body 111. The battery body 111 contains a PN junction for separating charge carriers. The electrode structure is used to collect and conduct charge carriers in the battery body 111. The solar cell can be a bifacial solar cell with the electrode structure located on both the light-facing and backlight-facing sides of the battery body, or the solar cell can be... Figure 2 and Figure 3 The electrode structures shown are all located on the back-light side of the battery body 111, and all back-contact battery cells are protected under this application. During normal operation of the battery cells, the side of the battery body that mainly receives light is the light-facing side, which is opposite to the back-light side.

[0028] Reference Figure 3 The electrode structure of the solar cell includes: a plurality of current collector electrodes 112, at least one first connector 12, at least one second connector 13, and at least one interconnection portion 115. Each current collector electrode 112 extends along a first direction X and is spaced apart along a second direction Y. The current collector electrodes 112 are electrically connected to the battery body 111 and are used to collect charge carriers in the battery body 111. The first direction X is different from the second direction Y, and the angle between them is not limited; for example, the angle between them is 90°. It should be noted that in a bifacial solar cell, the current collector electrodes 112 of two polarities are located on opposite sides of the battery body. The type of bifacial solar cell is not limited. The number of first connectors 12 and second connectors 13 in the solar cell is not limited.

[0029] The two polarities of the current collector 112 refer to the first current collector 1121 and the second current collector 1122. For a bifacial solar cell, each of the first current collectors 1121 located on the same side extends along the first direction X and is spaced apart along the second direction Y, and each of the second current collectors 1122 located on the same side extends along the first direction X and is spaced apart along the second direction Y. (Refer to...) Figure 3 In the back-contact solar cell, both types of current collector electrodes 112 are located on the back side of the cell body. Both types of current collector electrodes 112 extend along a first direction X, and typically along a second direction, with one first current collector electrode 1121 followed by one second current collector electrode 1122, and then another first current collector electrode 1121, alternating and spaced apart. Of the first current collector electrode 1121 and the second current collector electrode 1122, one is an N-type current collector electrode and the other is a P-type current collector electrode. The number of current collector electrodes 112 in the solar cell is not limited. The type of back-contact solar cell is not limited; for example, it can be a heterojunction (HJT) back-contact solar cell.

[0030] It should be noted that the current collector 112 mentioned in this application extends along the first direction X, specifically meaning that the overall orientation of the current collector 112 is along the first direction X, but its local extension in other directions is permitted. Other structures submitted in this application that extend along a certain direction are similar to those here, and will not be described again to avoid repetition.

[0031] It should be noted that the electrode structure of the solar cell in this application may include a bus electrode, or may not contain a bus electrode or have a few bus electrodes, all of which are within the scope of protection of this application. For example, refer to... Figure 3 The electrode structure of the solar cell also includes a plurality of bus electrodes 113 extending along the second direction Y and spaced apart along the first direction X. Each bus electrode 113 contacts at least one current collector 112 of the same polarity, achieving electrical connection through this contact. The bus electrodes 113 are used to collect current or charge carriers from the current collector 112 of the same polarity that are electrically connected to them. It should be noted that in the bifacial solar cell, the two types of bus electrodes 113 are located on opposite sides of the cell body. The two types of bus electrodes 113 refer to a first bus electrode 1131 and a second bus electrode 1132. The first bus electrodes 1131 located on the same side extend along the second direction Y and are spaced apart along the first direction X. The first bus electrodes 1131 located on the same side are electrically connected to a first collector electrode 1121 of the same polarity. Similarly, the second bus electrodes 1132 located on the same side extend along the second direction Y and are spaced apart along the first direction X. The second bus electrodes 1132 located on the same side are electrically connected to a second collector electrode 1122 of the same polarity. (Refer to...) Figure 3In the back-contact solar cell, both types of bus electrodes 113 are located on the back side of the cell body. Both types of bus electrodes 113 extend along the second direction Y, and typically along the first direction X. A first bus electrode 1131 is followed by a second bus electrode 1132, and then another first bus electrode 1131, alternating and spaced out. The first bus electrode 1131 is electrically connected to a first current collector 1121 of the same polarity. An insulating element 114 is provided at the intersection with the second current collector 1122 to prevent short circuits. The second bus electrode 1132 is electrically connected to a second current collector 1122 of the same polarity. An insulating element 114 is provided at the intersection with the first current collector 1121 to prevent short circuits. Of the first bus electrode 1131 and the second bus electrode 1132, one is an N-type bus electrode and the other is a P-type bus electrode. The number of bus electrodes 113 in the solar cell is not limited.

[0032] Reference Figure 3 The electrode structure of the solar cell further includes at least one interconnect portion 115, electrically connected to a current collector electrode of the same polarity. When the electrode structure also includes a bus electrode 113, the interconnect portion 115 is electrically connected to the bus electrode 113 of the same polarity. Specifically, the interconnect portion 115 may include a first interconnect portion 1151 and / or a second interconnect portion 1152. It may only have a first interconnect portion 1151, or only have a second interconnect portion 1152, or the solar cell may contain both a first interconnect portion 1151 and a second interconnect portion 1152, all of which are within the scope of this application. The first interconnect portion 1151 is electrically connected to the first collector electrode 1121 of the same polarity. When the electrode structure also includes a bus electrode 113, the first interconnect portion 1151 is electrically connected to the first bus electrode 1131 of the same polarity. The first interconnect portion 1151 may be set independently of the first collector electrode 1121 or the first bus electrode 1131, or it may be a part of the first collector electrode 1121 or the first bus electrode 1131. However, the first collector electrode 1121 or the first bus electrode 1131 is larger in size along the first direction X at the location of the first interconnect portion 1151. The second interconnect portion 1152 is electrically connected to the second collector electrode 1122 of the same polarity. When the electrode structure also includes a bus electrode 113, the second interconnect portion 1152 is electrically connected to the second bus electrode 1132 of the same polarity. The second interconnect portion 1152 may be set independently of the second collector electrode 1122 and the second bus electrode 1132, or it may be a part of the second collector electrode 1122 and the second bus electrode 1132. However, the second collector electrode 1122 and the second bus electrode 1132 are larger in size along the first direction X at the location of the second interconnect portion 1152. All of these are within the protection scope of this application.

[0033] It should be noted that, in the case where the electrode structure also includes a bus electrode 113, refer to Figure 3 As shown, the interconnect portion 115 is typically located at the contact point or intersection of the bus electrode and the collector electrode of the same polarity. Alternatively, the interconnect portion 115 overlaps with a contact point between the bus electrode of the same polarity and a collector electrode, thus providing an additional transmission path for carriers or current on the collector electrode in contact with it, improving the current collection effect. One form of the interconnect portion can be a PAD (pad).

[0034] Reference Figure 2 and Figure 3 As shown, the first connector 12 is located on the side of the interconnection section 115 away from the battery body 111. The second connector 13 is offset from the interconnection section 115, and it can be considered that the second connector 13 and the interconnection section 115 do not have direct contact or direct electrical connection.

[0035] It should be noted that, based on the fact that the second connector 13 is offset from the interconnection part 115, the second connector 13 can be offset from the collector electrode or overlap with the collector electrode, all of which are within the protection scope of this application.

[0036] In some embodiments, refer to Figure 3 At least one second connector 13 is located on the side of the current collector 112 away from the battery body, or in other words, at least one second connector 13 overlaps with the current collector 112. When the electrode structure does not include a bus electrode 113, the second connector 13 can directly contact the current collector 112. This allows the second connector 13 to provide an additional transport path for carriers or current on the current collector electrode it contacts, improving the current collection effect. Alternatively, refer to... Figure 3 When the electrode structure includes a busbar electrode 113, at least one second connector 13 is located on the side of the busbar electrode 113 away from the battery body 111, and overlaps with a contact position of the busbar electrode 113 and a current collector electrode 112 of the same polarity. It can be considered that the second connector 13 is located at a contact position of the busbar electrode of the same polarity and a current collector electrode. In this way, the second connector 13 can also add a transmission path for the charge carriers or current on the current collector electrode in contact with it, thereby improving the busbar effect.

[0037] It should be noted that the main difference between the first connector 12 and the second connector 13 lies in their positions. The first connector 12 is located on the side of the interconnection portion 115 away from the battery body 111, or in other words, the first connector 12 and the interconnection portion 115 overlap. The second connector 13 is offset from the interconnection portion 115, or in other words, the second connector 13 and the interconnection portion 115 do not overlap. When the electrode structure includes a bus electrode 113, both can overlap with a contact point of a bus electrode and a current collector of the same polarity. Figure 3 and Figure 4 A break in the section indicates that a portion of the battery cell is omitted.

[0038] It should be noted that, Figure 2 The main purpose of this section is to demonstrate the connection relationship between the interconnecting components, the first connector, and the second connector; some structural details have been omitted.

[0039] Reference Figures 2 to 4 In the second direction Y, at least one first connector 12 and at least one second connector 13 are arranged in a row. In this battery string, the first connector 12 and the second connector 13 in a row are both electrically connected to the interconnect 10. When the battery cell also includes a bus electrode, in the battery string, the bus electrode 113 of the battery cell 11 is electrically connected to the interconnect 10 through the first connector 12 and the second connector 13 in a row. Compared to related technologies where the battery cell 11 is only electrically connected to the interconnect 10 through the first connector 12, in this application, in addition to this, the battery cell 11 is also electrically connected to the interconnect 10 through the second connector 13 in the extension direction of the interconnect 10, increasing the pathway and contact area for the electrical connection between the battery cell 11 and the interconnect 10. This increases the connection tension or electrical connection tension between the battery cell 11 and the interconnect 10, significantly reduces soldering misalignment problems, improves electrical connection reliability, and thus improves yield. Furthermore, the better electrical connection effect between the battery cell and the interconnect can also reduce the series resistance of the photovoltaic module.

[0040] More specifically, refer to Figure 2 and Figure 3In the second direction Y, at least one first connector 12 and at least one second connector 13 are arranged in a row at intervals. Since the interconnect 10 extends along the second direction Y, the solar cell 11 is electrically connected to the interconnect 10 not only through the first connector 12 but also through the second connector 13 within this row. This increases the pathways and contact area for the electrical connection between the solar cell 11 and the interconnect 10, thereby increasing the connection tension or electrical connection tension between the solar cell 11 and the interconnect 10, significantly reducing electrical connection misalignment problems, improving electrical connection reliability, and thus improving yield. In addition, the better electrical connection effect between the solar cell and the interconnect can also reduce the series resistance of the photovoltaic module. The interval distribution of the first connector 12 and the second connector 13 in the second direction Y can disperse the connection stress between the solar cell and the interconnect, reducing the risk of microcracks or breakage of the solar cell and the interconnect.

[0041] It should be noted that an alloy may be formed between the first connector 12 and the interconnect, or an alloy may be formed between the bus electrode, the first connector and the interconnect, or an alloy may be formed between the second connector 13 and the interconnect, or an alloy may be formed between the bus electrode, the second connector 13 and the interconnect, or no alloy may be formed at any of the above locations, all of which are within the scope of protection of this application.

[0042] In some possible embodiments, the first connector 12 also wraps at least a portion of the side of the interconnect 10. Specifically, the first connector 12 may also wrap at least a portion of the side of the interconnect 10 near the current collector electrode or bus electrode. The first connector 12 can be used to fix and electrically connect the side of the interconnect. Since the first connector 12 wraps a larger area of ​​the interconnect, it further increases the path and contact area for electrical connection between the cell 11 and the interconnect 10, thereby increasing the connection tension or electrical connection tension between the cell 11 and the interconnect 10, and significantly reducing the soldering misalignment problem, improving the reliability of electrical connection, and thus improving the yield. In addition, the better electrical connection effect between the cell and the interconnect can also reduce the series resistance of the photovoltaic module.

[0043] It should be noted that when the first connector 12 also covers at least a portion of the side surface of the interconnecting member 10, the proportion of the area of ​​the covered portion to the area of ​​the side surface is not limited.

[0044] In some possible embodiments, the second connector 13 also wraps around at least a portion of the side of the interconnect 10. Specifically, the second connector 13 may also wrap around at least a portion of the side of the interconnect 10 near the current collector electrode or bus electrode. The second connector 13 can be used to fix and electrically connect the side of the interconnect. Since the second connector 13 wraps around the interconnect for a larger area, it further increases the path and contact area for electrical connection between the cell 11 and the interconnect 10, thereby increasing the connection pull or electrical connection pull between the cell 11 and the interconnect 10, and significantly reducing the soldering misalignment problem, improving the reliability of electrical connection, and thus improving the yield. In addition, the better electrical connection effect between the cell and the interconnect can also reduce the series resistance of the photovoltaic module.

[0045] It should be noted that when the second connector 13 also covers at least a portion of the side surface of the interconnecting member 10, the proportion of the area of ​​the covered portion to the area of ​​the side surface is not limited.

[0046] It should be noted that, for a single solar cell, when the solar cell also includes busbars, the number of columns formed by the first connectors 12 and the second connectors 13 in the second direction Y can be less than or equal to the number of busbars in the solar cell. The specific number of first connectors and second connectors in a column is not limited. The arrangement of at least one first connector 12 and at least one second connector 13 in a column in the second direction Y, as mentioned in this application, can specifically mean that at least one first connector 12 and at least one second connector 13 overlap in the second direction Y, with the interconnects passing through at least a partial overlap position; the degree of overlap is not limited. For example, in the second direction Y, each first connector 12 in a column is located along two opposite edges in the first direction X (e.g., ...). Figure 2 The left and right edges of the first connector 12 in the column, and the two opposite edges of each of the second connectors 13 in the first direction X (e.g., the left and right edges of the first connector 12 in the column). Figure 2 The left and right edge lines of the second connector 13 may be collinear or have certain deviations, which are all within the scope of protection of this application.

[0047] In some possible embodiments, refer to Figure 2 and Figure 3In the second direction Y, at least two second connectors 13 are spaced apart and arranged in a row. Since the interconnect 10 extends along the second direction Y, the more second connectors 13 in this row, the more pathways and contact areas there are for electrical connection between the cell 11 and the interconnect 10. This further increases the connection tension or electrical connection tension between the cell 11 and the interconnect 10, and significantly reduces the electrical connection misalignment problem, improving electrical connection reliability and thus improving yield. In addition, better electrical connection between the cell and the interconnect can also reduce the series resistance of the photovoltaic module. The spaced distribution of the second connectors 13 in the second direction Y can disperse the connection stress between the cell and the interconnect, reducing the risk of microcracks or breakage of the cell and the interconnect.

[0048] It should be noted that, for a single solar cell, when the solar cell also includes busbars, the number of columns formed by the various second connectors 13 in the second direction Y can be less than or equal to the number of busbars in the solar cell. The specific number of second connectors in a column is not limited. The phrase "at least two second connectors 13 arranged in a column in the second direction Y" mentioned in this application specifically means that at least two second connectors 13 overlap in the second direction Y, with the interconnecting elements passing through at least a partial overlap position; the degree of overlap is not limited. For example, in the second direction Y, the various second connectors 13 in a column are located along two opposite edges in the first direction X (e.g., ...). Figure 2 The left and right edges of the second connector 13 can be collinear or have certain deviations, which are all within the scope of protection of this application.

[0049] In some possible embodiments, refer to Figure 2 and Figure 3In the second direction Y, at least two first connectors 12 are arranged in a row with spacing between them. This increases the connection tension or electrical connection tension between the solar cell 11 and the interconnect 10, significantly reduces welding misalignment, improves electrical connection reliability, and thus improves yield. Furthermore, the better electrical connection between the solar cell and the interconnect can reduce the series resistance of the photovoltaic module. The spacing of the first connectors 12 in the second direction Y also disperses the connection stress between the solar cell and the interconnect, reducing the risk of microcracks or breakage in the solar cell and interconnect. It should be noted that, for a single solar cell, if the solar cell also includes bus electrodes, the number of rows formed by the first connectors 12 in the second direction Y can be less than or equal to the number of bus electrodes in the solar cell. The specific number of first connectors 12 in a row is not limited. Specifically, the arrangement of at least two first connectors 12 in a row in the second direction Y mentioned in this application can mean that at least two first connectors 12 overlap in the second direction Y, with the interconnect passing through at least a partial overlap position; the degree of overlap is not limited. For example, in the second direction Y, each of the first connectors 12 in a column is on two opposite edges in the first direction X (such as...). Figure 2 The left and right edges of the first connector 12 can be collinear or have certain deviations, which are all within the scope of protection of this application.

[0050] In some possible embodiments, refer to Figure 2 In the second direction Y, based on at least one first connector 12 and at least one second connector 13 arranged in a row with spacing, the distance between adjacent first connectors 12 and second connectors 13 in a row is d1. In the second direction Y, based on at least two second connectors 13 arranged in a row with spacing, the distance between two adjacent second connectors 13 in a row is d2, where d2 ≤ d1. Specifically, within a row, the first connector 12, due to the supporting effect of the interconnect portion, may contribute more to the electrical connection effect between the battery cell and the interconnect. Therefore, even with a larger distance d1 between the first connector 12 located on the interconnect portion and the adjacent second connector 13 in a row, a good electrical connection effect between the battery cell and the interconnect can still be guaranteed, and material waste can be avoided.

[0051] It should be noted that when comparing the sizes of d2 and d1, it is not limited whether the first and second connectors corresponding to d1 and the two adjacent second connectors corresponding to d2 are in the same column. For example, refer to... Figure 2 In comparing the size of d2 and d1, d1 can be compared with d2 in the same column, or d1 can be compared with d2 in a different column; both are within the scope of protection of this application.

[0052] It should be noted that in determining d1, it can be the distance between two adjacent edges of a pair of adjacent first connectors 12 and second connectors 13 within a column, or the arithmetic mean of the distances between two or more pairs of adjacent first connectors 12 and second connectors 13 within a column; or, it can be the distance between the centers of a pair of adjacent first connectors 12 and second connectors 13 within a column in the second direction Y, or the arithmetic mean of the distances between the centers of two or more pairs of adjacent first connectors 12 and second connectors 13 within the second direction Y; or, it can be the distance between two opposite edges of a pair of adjacent first connectors 12 and second connectors 13 within a column, or the arithmetic mean of the distances between two or more pairs of adjacent first connectors 12 and second connectors 13 within a column. In the case of two or more pairs, each pair of corresponding first connectors 12 and second connectors 13 are in the same column, but two or more pairs of corresponding first connectors 12 and second connectors 13 may all be in the same column, or may be located in different columns, all of which are within the scope of protection of this application. The method for determining d1 in this application is not limited to the example method described above. The method for determining d2 can be similar to or the same as the method for determining d1. To avoid repetition, it will not be described again.

[0053] In some possible embodiments, refer to Figure 2 Based on the condition that d2 < d1, the difference between d1 and d2 can be between 0.3mm and 1.5mm. If the difference is too large or too small, the supplementary effect on the electrical connection tension between the battery cell and the interconnect is not good, and it may also lead to material waste. Therefore, if the difference is within the above range, it will not only have a good supplementary effect on the electrical connection tension between the battery cell and the interconnect, but also avoid material waste.

[0054] For example, based on the condition d2 < d1, the difference between d1 and d2 can be 0.3mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.3mm, 1.4mm, or 1.5mm.

[0055] In some possible embodiments, refer to Figure 2 The aforementioned d1 is 3 to 5 mm. If d1 is too large, the supplementary effect of the electrical connection tension between the battery cell and the interconnect is not good. If d1 is too small, it may also lead to material waste. Therefore, if d1 is within the above range, not only is the electrical connection tension between the battery cell and the interconnect greater, but there is also no material waste.

[0056] For example, d1 can be 3mm, 3.2mm, 3.5mm, 3.7mm, 3.8mm, 3.8mm, 4mm, 4.1mm, 4.2mm, 4.5mm, 4.7mm, 4.9mm, or 5mm.

[0057] In some possible embodiments, refer to Figure 2 The aforementioned d2 is 2.5 to 4 mm. If d2 is too large, the supplementary effect of the electrical connection tension between the battery cell and the interconnect is not good. If d2 is too small, it may also lead to material waste. Therefore, d2 within the above range not only has a good supplementary effect of the electrical connection tension between the battery cell and the interconnect, but also avoids material waste.

[0058] For example, d2 can be 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.7mm, 3.8mm, 3.8mm, or 4mm.

[0059] In some possible embodiments, refer to Figure 2 and Figure 3 In the second direction Y, based on at least one first connector 12 and at least one second connector 13 arranged at intervals and in a row, within a row, at least one first connector 12 is closer to the edge line 1111 of the battery body than the second connector 13. The edge line 1111 refers to at least a portion of the outline of the battery body, which extends along the first direction X, or has a portion extending along the first direction X. Specifically, within a row, the first connector 12 may contribute more to the electrical connection effect between the battery cell and the interconnect due to the supporting effect of the interconnect portion. Moreover, the position near the edge line 1111 of the battery body in the second direction Y is generally closer to the starting position of the connection between the interconnect and the battery cell. At this position, the connection tension or connection reliability of the interconnect and the battery cell is greater. Therefore, in the second direction Y, by increasing the connection tension or connection reliability of the interconnect and the battery cell at the position near the edge line 1111 of the battery body in the second direction Y, the connection reliability of the interconnect and the battery cell is further improved.

[0060] In some possible embodiments, refer to Figure 2 In the second direction Y, the width d3 of the second connector 13 is smaller than the width d4 of the first connector 12. Specifically, based on the first connector 12, when the width d3 of the second connector 13 is less than d4, it already plays a supplementary role in improving the connection tension or connection reliability between the interconnect and the battery cell. The electrical connection tension between the interconnect and the battery cell can already meet the required standard. d3 < d4 can also avoid material waste caused by the excessive width of the second connector 13. In addition, if the width d3 of the second connector 13 is too large, it will block more light. Therefore, in this application, d3 < d4 can also avoid the blocking of light caused by the excessive width of the second connector 13, further improving the power generation efficiency.

[0061] In some possible embodiments, refer to Figure 2Based on the condition that d3 < d4, the difference between d3 and d4 can be between 0.08 and 0.15 mm. Specifically, if this difference is too large, the second connector 13's supplementary role in ensuring good connection tension or reliability between the interconnecting components and the solar cells is inadequate. If this difference is too small, the second connector 13 may result in material waste, excessively high photovoltaic module costs, and significant shading from the light. Therefore, when the difference between d3 and d4 is within the aforementioned range, not only does the second connector 13 provide good supplementary role in ensuring good connection tension or reliability between the interconnecting components and the solar cells, but the photovoltaic module cost is also lower, while the second connector 13 provides less shading.

[0062] For example, the difference between d3 and d4 can be 0.08mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, or 0.15mm.

[0063] In some possible embodiments, refer to Figure 2 In the second direction Y, the width d3 of the second connector 13 can be 0.2 to 0.4 mm. If d3 is too small, the second connector 13 will not provide a good supplement to the connection tension or connection reliability of the interconnect and the solar cell. If d3 is too large, the second connector 13 may waste materials, the cost of the photovoltaic module will be too high, and the second connector 13 will block more light. Therefore, if d3 is within the above range, not only will the second connector 13 provide a good supplement to the connection tension or connection reliability of the interconnect and the solar cell, but the cost of the photovoltaic module will also be lower, and the second connector 13 will block less light.

[0064] For example, d3 can be 0.2mm, 0.25mm, 0.28mm, 0.3mm, 0.32mm, 0.35mm, 0.38mm, or 0.4mm.

[0065] It should be noted that, in the second direction Y, when the width of a second connector 13 varies at different positions, d3 can be the maximum width, minimum width, or arithmetic mean of the widths at two or more positions of the second connector 13, or it can be the arithmetic mean of the widths of two or more second connectors 13. The method for determining d4 is the same or similar, and will not be repeated here to avoid repetition.

[0066] In some possible embodiments, refer to Figure 2 In the second direction Y, the width d4 of the first connector 12 can be 0.3 to 0.5 mm. This not only significantly contributes to the connection tensile strength or reliability of the interconnecting components and solar cells, but also results in lower photovoltaic module costs and less shading from the first connector 12. For example, d4 can be 0.3 mm, 0.35 mm, 0.38 mm, 0.4 mm, 0.42 mm, 0.45 mm, 0.48 mm, or 0.5 mm.

[0067] In some possible embodiments, refer to Figure 2 In the first direction X, the length d5 ​​of the second connector 13 is equal to the length d6 of the first connector 12. When the two are equal, the second connector 13 provides a good supplement to the connection tension or connection reliability of the interconnect and the battery cell, and there is basically no material waste. At the same time, the first direction X is the direction in which the width of the interconnect is located. The interconnect is usually a long strip structure, and its width is relatively small compared to its length. In the first direction X, the length d5 ​​of the second connector 13 is equal to the length d6 of the first connector 12, which makes the positioning redundancy of the interconnect in the first direction X large and reduces the alignment difficulty.

[0068] It should be noted that, in the first direction Y, when the length of a second connector 13 varies at different positions, d5 can be the maximum length, minimum length, or arithmetic mean of the lengths at two or more positions of the second connector 13, or it can be the arithmetic mean of the lengths of two or more second connectors 13. The method for determining d6 is the same or similar, and will not be repeated here to avoid repetition.

[0069] It is worth noting that the equality of d5 and d6 mentioned in this application may include absolute equality as well as equality within a certain error range, where the error may be less than or equal to 5% of d6.

[0070] In some possible embodiments, refer to Figure 2 In the first direction X, the length d5 ​​of the second connector 13 can be from 0.4 to 0.6 mm. This not only significantly contributes to the connection tensile strength or reliability of the interconnecting components and solar cells, but also results in lower photovoltaic module costs and less shading from the second connector 13. For example, d5 can be 0.4 mm, 0.45 mm, 0.48 mm, 0.5 mm, 0.52 mm, 0.55 mm, 0.58 mm, or 0.6 mm.

[0071] In some possible embodiments, the height of the second connector 13 is equal to the height of the first connector 12. When the two are equal, the second connector 13 provides good supplementary support for the connection tension or connection reliability of the interconnect and the battery cell, and there is basically no material waste. At the same time, when printing or other methods are used, the second connector 13 and the first connector 12 can be formed in the same process without the need for additional process steps.

[0072] It should be noted that when the height of a second connector 13 varies at different locations along the thickness Z direction of the photovoltaic module, the height of the second connector 13 can be its maximum height, minimum height, or the arithmetic mean of the heights at two or more locations. The method for determining the first connector 12 is the same or similar, and will not be repeated here to avoid repetition.

[0073] It is worth noting that the equal height mentioned in this application can include absolute equality as well as equality within a certain error range. The error here can be less than or equal to 5% of the height of the first connector 12 or the second connector 13.

[0074] In some possible embodiments, the height of the second connector 13 in the thickness direction Z of the photovoltaic module can be from 50 to 250 μm. This not only significantly contributes to the connection tensile strength or reliability of the interconnects and cells, but also results in lower photovoltaic module costs. For example, the height of the second connector 13 can be 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 220 μm, or 250 μm.

[0075] In some possible embodiments, refer to Figures 2 to 4 The battery cell is a back-contact battery cell. In the first direction X, two adjacent second connectors 13 are spaced apart and staggered to avoid short circuit.

[0076] More specifically, refer to Figure 4 In back-contact solar cells, an insulating element 114 is typically required to physically isolate the interconnects from current collectors of different polarities to prevent short circuits. Usually, the insulating element 114 is installed first, followed by the interconnects. However, the presence of the insulating element 114 causes the surface of the solar cell to become uneven. Related technologies only include a first connector 12, resulting in a relatively small electrical connection pull between the solar cell and the interconnects. (Refer to...) Figure 5 The existing technology can lead to quality problems such as poor soldering and misaligned soldering. After electrical connection, gaps 20 and loose connections may still occur between the solar cell and the interconnect, affecting the yield. In this application, a second connector 13 is added, and the solar cell 11 is also electrically connected to the interconnect 10 through the second connector 13. This increases the path and contact area for electrical connection between the solar cell 11 and the interconnect 10, thereby increasing the connection tension or welding tension between the solar cell 11 and the interconnect 10, and significantly reducing the problem of misaligned soldering, improving the reliability of electrical connection, and thus improving the yield. In addition, the better electrical connection between the solar cell and the interconnect can also reduce the series resistance of the photovoltaic module.

[0077] It should be noted that the insulating component 114 can provide good insulation and can be made of materials such as insulating adhesive, without limitation.

[0078] In some possible embodiments, refer to Figure 2 and Figure 6 Based on the back-contact battery cell, the plurality of current collector electrodes 112 include: a plurality of first current collector electrodes 1121 and a plurality of second current collector electrodes 1122. The first current collector electrodes 1121 and the second current collector electrodes 1122 have different polarities, one of which is an N-type current collector electrode and the other is a P-type current collector electrode. Along the second direction Y, the interconnect 10 is electrically connected to the first current collector electrode. An insulating member 114 is provided between the interconnect and the second current collector electrode 1122 to prevent short circuit between the interconnect and the second current collector electrode 1122. At least one second connector 13 is located on the side of the insulating member 114 away from the battery body, or in other words, at least one second connector 13 overlaps with the insulating member 114. Due to the presence of the insulating member 114, the height of the second connector 13 on the insulating member 114 can be relatively low to make full contact with the interconnect, thereby improving the pull-out force and achieving a good contact effect. This can reduce the cost of the second connector, reduce the cost of photovoltaic modules or cells, and achieve a good electrical connection with the interconnect, improving the pull-out force and reliability.

[0079] In some possible embodiments, refer to Figure 2 and Figure 6 Based on the back-contact battery cell, the plurality of current collector electrodes 112 include: a plurality of first current collector electrodes 1121 and a plurality of second current collector electrodes 1122. The first current collector electrodes 1121 and the second current collector electrodes 1122 have different polarities, one of which is an N-type current collector electrode and the other is a P-type current collector electrode. Along the second direction Y, the interconnect 10 is electrically connected to the first current collector electrode. An insulating member 114 is provided between the interconnect and the second current collector electrode 1122 to avoid short circuit between the interconnect and the second current collector electrode 1122. At least one second connector 13 is staggered from the insulating member 114, or in other words, at least one second connector 13 does not overlap with the insulating member 114. Specifically, due to the presence of the insulating element 114, the insulating element 114 may be located at a relatively high position, and there may be a height difference between it and the surrounding area. At least one second connector 13 is set off from the insulating element 114. On the one hand, the presence of the second connector 13 can reduce the height difference between the insulating element 114 and the location of the insulating element, which can reduce the risk of microcracks. On the other hand, the second connector 13 can also increase the pull-out force and connection reliability between the battery cell and the interconnect.

[0080] It should be noted that, for the same back contact cell, all the second connectors 13 may be located on the side of the insulating member 114 away from the battery body, or all the second connectors 13 may be staggered from the insulating member 114, or some of the second connectors 13 may be located on the side of the insulating member 114 away from the battery body, while other parts of the second connectors 13 may be staggered from the insulating member 114. All of the above examples are within the protection scope of this application.

[0081] Figure 6 for Figure 2 A partially enlarged schematic diagram of the area indicated by the dashed elliptical box. In some possible embodiments, refer to... Figure 2 and Figure 6 Based on the back-contact battery cell, the spacing d7 of the adjacent second connectors 13 arranged at intervals and staggered along the second direction Y in the first direction X is 0.3 to 1.2 mm. On the one hand, it is more compatible with the electrode structure arrangement in the current back-contact battery cell. On the other hand, it makes a greater contribution to the tensile strength and reliability of the electrical connection between the battery cell 113 and the interconnector 10.

[0082] For example, d7 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, or 1.2mm.

[0083] In some possible embodiments, the thickness of the battery body 111 is 115 to 135 μm, and the direction of this thickness is parallel to the thickness direction Z of the photovoltaic module. Specifically, the thinner the battery body 111, the greater its warpage may be during electrical connection, which will further reduce the yield of electrical connection between the interconnect and the battery cell. In this application, through the supplementary role of the aforementioned second connector 13, the electrical connection yield can still be met for thinner battery cells. In addition, a thinner battery body is cheaper and can reduce bulk carrier recombination, thereby increasing the open-circuit voltage and fill factor (FF) of the battery cell, ultimately improving the battery cell efficiency. Furthermore, a thinner battery body is lighter, making it easier to transport and install.

[0084] For example, the thickness of the battery body 111 can be 115μm, 118μm, 120μm, 123μm, 125μm, 127μm, 130μm, 133μm, or 135μm.

[0085] In some possible embodiments, refer to Figures 2 to 4 ,as well as Figure 6 The projected shape of the second connector 13 includes at least one of a circle, an ellipse, or a rectangle, and the above shapes are relatively regular and easy to manufacture.

[0086] It should be noted that the projection shape of the second connector 13 refers to the shape of the projection of the second connector 13 onto the battery body when the second connector 13 is illuminated by light parallel to the thickness direction Z of the photovoltaic module.

[0087] 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 interconnect and the battery cell to prevent misalignment of the two before electrical connection, and on the other hand, the above material can also play a good role in supplementing the electrical connection tension between the interconnect and the battery body.

[0088] In some possible embodiments, the second connector and the first connector are made of the same material, and thus both can be formed in the same process. The second connector does not require additional process steps, which can reduce production costs.

[0089] This application also provides a photovoltaic system, which may include a plurality of any of the aforementioned photovoltaic modules, wherein the photovoltaic modules may be arranged in an array. For example, the photovoltaic system may be installed on a building roof, or may exist directly as a building roof, etc., and the specific form of the photovoltaic system is not limited. This photovoltaic system has the same or similar beneficial effects as any of the aforementioned photovoltaic modules, and related aspects can be referred to each other. To avoid repetition, further details are omitted here.

[0090] The following examples further explain this application.

[0091] Example 1 Reference Figures 2 to 4 The battery cell is a back-contact battery cell with a thickness of approximately 120 μm. Conductive adhesive with a height of 140 μm is printed on the battery cell to form a first connector 12 and a second connector 13. In the second direction Y, the first connectors 12 and 13 are spaced apart and arranged in columns. In the second direction Y, the second connectors 13 are also spaced apart and arranged in columns. Within a column, the distance d2 between two adjacent second connectors 13 is 3 mm, and the distance d1 between adjacent first connectors 12 and second connectors 13 is 4 mm. The solder strip uses a copper core (0.25 mm thick, 0.6 mm wide) plated with tin (5 μm thick) and coated with a graphene coating (200 nm thick). The soldering temperature is approximately 140℃.

[0092] Performance tests were conducted on multiple photovoltaic modules from Example 1. Multiple test results showed that the tensile force between the bus electrode and the solder ribbon, or between the cell and the solder ribbon, was >3 N / mm, and the series resistance between the cell and the solder ribbon was 0.4 to 0.6 mΩ. This tensile force test can be performed using a tensile testing machine, and both the tensile force test and the series resistance test were conducted according to relevant industry standards.

[0093] Comparative Example Reference Figures 2 to 4 The battery cell is a back-contact battery cell. The only difference between the comparative example and Example 1 above is that only the first connector 12 is provided, and the second connector is not provided. The rest of the parts are the same.

[0094] Performance tests were conducted on multiple photovoltaic modules used in the comparative example. Multiple test results showed that the tensile force between the bus electrode and the solder ribbon, or between the cell and the solder ribbon, was approximately 1.4 N / mm, and the series resistance between the cell and the solder ribbon was 0.4 to 0.8 mΩ. The test environment and process parameters for the comparative example were the same as those for Example 1.

[0095] By comparison, it can be concluded that, compared with the comparative example, in Example 1, the solar cell 11 is also electrically connected to the interconnecting element 10 through the second connector 13, which increases the path and contact area of ​​the electrical connection between the solar cell 11 and the interconnecting element 10, thereby increasing the connection tension or electrical connection tension between the solar cell 11 and the interconnecting element 10 and improving the reliability of the electrical connection; in addition, the better electrical connection effect between the solar cell and the interconnecting element can also reduce the series resistance of the photovoltaic module.

[0096] It should be noted that the photovoltaic modules and photovoltaic systems provided in this application can be referenced interchangeably and can achieve the same or similar beneficial effects. To avoid repetition, further details will not be provided.

[0097] 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.

[0098] 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.

[0099] 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, characterized in that, include: A plurality of battery strings; the battery strings include interconnecting elements and a plurality of battery cells, the interconnecting elements being electrically connected to adjacent battery cells; The 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, at least one first connector, at least one second connector, and at least one interconnection portion, each of the current collector electrodes extending along a first direction and spaced apart along a second direction, the current collector electrodes being electrically connected to the battery body, the first direction being different from the second direction; the interconnection portion being electrically connected to the current collector electrodes of the same polarity; The first connector is located on the side of the interconnection portion away from the battery body; The second connector is offset from the interconnection portion, and in the second direction, at least one first connector and at least one second connector are spaced apart and arranged in a row; In the battery string, both the first connector and the second connector in one column are electrically connected to the interconnect.

2. The photovoltaic module according to claim 1, characterized in that, At least one of the second connectors is located on the side of the current collector electrode away from the battery body.

3. The photovoltaic module according to claim 1, characterized in that, In the second direction, at least two of the second connectors are spaced apart and arranged in a row.

4. The photovoltaic module according to claim 3, characterized in that, Within a column, the spacing between adjacent first connectors and second connectors is d1; Within a column, the spacing between two adjacent second connectors is d2; d2≤d1.

5. The photovoltaic module according to claim 4, characterized in that, The difference between d1 and d2 is 0.3 to 1.5 mm; and / or, d1 is 3 to 5 mm; and / or, d2 is 2.5 to 4 mm.

6. The photovoltaic module according to claim 1, characterized in that, Within a column, at least one of the first connectors is closer to the edge of the battery body than the second connector.

7. The photovoltaic module according to claim 1, characterized in that, In the second direction, the width of the second connector is smaller than the width of the first connector; and / or, In the first direction, the length of the second connector is equal to the length of the first connector; and / or, The height of the second connector is equal to the height of the first connector.

8. The photovoltaic module according to claim 7, characterized in that, In the second direction, the difference between the width of the first connector and the width of the second connector is 0.08 to 0.15 mm; and / or, In the second direction, the width of the second connector is 0.2 to 0.4 mm; and / or, In the first direction, the length of the second connector is 0.4 to 0.6 mm; and / or, The height of the second connector is 50 to 250 μm.

9. The photovoltaic module according to claim 1, characterized in that, The second connector covers at least a portion of the side of the interconnect.

10. The photovoltaic module according to any one of claims 1 to 9, characterized in that, The battery cell is a back-contact battery cell, and in the first direction, two adjacent second connectors are spaced apart and staggered.

11. The photovoltaic module according to claim 10, characterized in that, The plurality of collector electrodes includes: a plurality of first collector electrodes and a plurality of second collector electrodes, wherein the first collector electrodes and the second collector electrodes have different polarities; Along the second direction, the interconnecting member is electrically connected to the first collector electrode, and an insulating member is provided between the interconnecting member and the second collector electrode; At least one of the second connectors is located on the side of the insulator away from the battery body; and / or, at least one of the second connectors is offset from the insulator.

12. The photovoltaic module according to claim 10, characterized in that, The distance between two adjacent second connectors along the second direction is 0.3 to 1.2 mm.

13. The photovoltaic module according to any one of claims 1 to 9, characterized in that, The thickness of the battery body is 115 to 135 μm.

14. The photovoltaic module according to any one of claims 1 to 9, characterized in that, The material of the second connector includes conductive adhesive; and / or, The first connector and the second connector are made of the same material.

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