Photovoltaic module

Abstract

This application provides a photovoltaic module, belonging to the field of photovoltaic technology. The photovoltaic module includes multiple solar cells; multiple electrical connection lines extending along a first direction and connecting adjacent solar cells; and multiple adhesive portions located on at least one surface of each solar cell, bonding the electrical connection lines and the solar cells, with the adhesive portions partially covering the electrical connection lines and having a contact area with the surface of the solar cells. Each adhesive portion includes a first portion covering the surface of the electrical connection lines, the projection of the first portion onto the surface of the solar cells being within the projection of the electrical connection lines onto the surface of the solar cells; the length of the top of the first portion along the first direction is less than the length of the contact area along the first direction. This application, based on the coverage of the electrical connection lines by the adhesive portions, provides a better fixing effect while also ensuring good light utilization.

Description

Technical Field

[0001] This application relates to the field of solar cell technology, and more particularly to a photovoltaic module. Background Technology

[0002] With the development and widespread application of solar cell technology, photovoltaic power generation has become one of the most competitive energy forms in the future. Solar cells are classified into various types based on different cell structures, such as emitter and back passivated (PERC) cells, tunnel oxide passivated contact (TOPCon) cells, heterojunction with intrinsic thin-layer (HJT) cells, and interdigitated back contact (IBC) cells.

[0003] In photovoltaic modules, the fine grids (also called current collectors) on the solar cells achieve circuit conduction through electrical connectors (also called solder ribbons). However, the limited bonding between the electrical connectors and the solar cells results in poor connection strength for the photovoltaic module, affecting its long-term reliability. Summary of the Invention

[0004] In view of this, in order to at least partially solve the aforementioned technical problems, this application provides a photovoltaic module.

[0005] According to one embodiment of this application, a photovoltaic module is provided, comprising: a plurality of solar cells, each solar cell including a plurality of current collector electrodes located on at least one surface of the solar cell; the plurality of current collector electrodes being spaced apart in a first direction and extending along a second direction intersecting the first direction; a plurality of electrical connection lines extending along the first direction and connecting adjacent solar cells; a plurality of adhesive portions located on at least one surface of the solar cells, adhesively bonding the electrical connection lines and the solar cells, wherein the adhesive portions partially cover the electrical connection lines and have a contact area with the surface of the solar cells; wherein the adhesive portion includes a first portion covering the surface of the electrical connection lines, the projection of the first portion on the surface of the solar cells being located within the projection of the electrical connection lines on the surface of the solar cells; the length of the top of the first portion along the first direction is less than the length of the contact area along the first direction.

[0006] According to the photovoltaic module provided in the above embodiments of this application, by covering the electrical connection lines with an adhesive portion, a good fixing effect can be provided, reducing the risk of poor soldering or desoldering of the electrical connection lines and ensuring the current collection capacity of the electrical connection lines. Furthermore, the first portion covering the electrical connection lines is relatively narrower along the first direction, which helps to reduce the impact of the adhesive portion on light absorption. This achieves a good fixing effect on the electrical connection lines while improving the light absorption effect of the solar cells, enabling the module to achieve both good light absorption and reliability. Attached Figure Description

[0007] The above and other objects, features and advantages of this application will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0008] Figure 1 A partial top view of a photovoltaic module according to an embodiment of this application is shown;

[0009] Figure 2 A top view of an adhesive portion according to an embodiment of this application is shown;

[0010] Figure 3 It shows Figure 2 A cross-sectional view of the adhesive portion along the y1 axis;

[0011] Figure 4 It shows Figure 2 A cross-sectional view of the adhesive portion along the y2 axis;

[0012] Figure 5 It shows Figure 2 A cross-sectional view of the adhesive portion along the y3 axis;

[0013] Figure 6 It shows Figure 2 A cross-sectional view of the adhesive portion along the x1 axis of the electrical connection line 3;

[0014] Figure 7 A side view of the adhesive portion according to an embodiment of this application is shown; Figure 8 A partial top view of the adhesive portion according to an embodiment of this application is shown;

[0015] Figure 9 A partial top view of a photovoltaic module near the edge of an embodiment of this application is shown.

[0016] In the accompanying drawings, the meanings of the reference numerals are as follows:

[0017] 1. Battery cells;

[0018] 2. Collector electrode;

[0019] 3. Electrical connection wires;

[0020] 4. Adhesive parts;

[0021] 41 - Contact area. Detailed Implementation

[0022] The embodiments of this application will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of this application. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of this application for ease of explanation. However, it will be apparent that one or more embodiments may be implemented without these specific details. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this application.

[0023] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "comprising" as used herein indicates the presence of features, steps, or operations, but does not exclude the presence or addition of one or more other features.

[0024] When using expressions such as "at least one of A, B or C", they should generally be interpreted in accordance with the meaning that is commonly understood by those skilled in the art (e.g., "a system having at least one of A, B or C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B, and C, etc.).

[0025] In this application, the relative position between two components (e.g., a membrane or region), as referred to by terms such as "above," "on," or "above," can mean that the two components are in direct contact or that they are not in direct contact. Similarly, the relative position between two components, as referred to by terms such as "below," "under," or "below," can mean that the two components are in direct contact or that they are not in direct contact. For example, when one component (e.g., a membrane or region) is referred to as "on another component," it can be directly on the other component, or there may be other components between them. On the other hand, when a component is referred to as "directly on another component," there are no components between them. Furthermore, when one component is referred to as "on another component," the two components have a vertical relationship in the planar view, and this component can be above or below the other component, thus this vertical relationship depends on the orientation of the device.

[0026] Solar cells, as the core component of photovoltaic modules, significantly impact power generation due to factors such as cell efficiency and light-receiving area. Simultaneously, welding performance also affects the module's carrier collection efficiency and power generation performance. In related technologies, solar cells, such as TOPCon cells or back-contact cells, have few or no grid lines on their surface (OBB cells). These cells are typically fixed by welding fine grids to solder ribbons and then applying adhesive along the direction of the solder ribbons. However, arbitrarily setting the adhesive application location not only increases adhesive consumption and costs but may also affect light absorption or result in poor connection reliability.

[0027] In realizing the concept of this application, it was discovered that by at least partially covering the electrical connection wire with an adhesive portion, the fixing effect on the electrical connection wire is enhanced, reducing issues such as poor soldering or missing solder joints, and improving carrier collection efficiency. By setting the length of the contact area at the bottom of the adhesive portion along the first direction to be larger than the length of the top of the covering portion, a larger adhesive area is provided at the bottom of the adhesive portion, increasing the adhesive force and enhancing the fixing effect. Meanwhile, the shorter length of the top of the covering portion helps to coordinate the reflective properties of the electrical connection wire.

[0028] According to the photovoltaic module provided in this application, it includes multiple cell strings, each containing at least one solar cell. The solar cell in this application can be a bifacial cell, such as an HJT cell (heterojunction cell), a TOPCon cell (tunneling oxide passivation contact cell), or a back contact cell. Further, the back contact cell can be a conventional IBC cell (interdigitated back contact cell), a TBC cell (TOPCon back contact cell), an HBC cell (heterojunction back contact cell), or a hybrid cell (i.e., the PN passivation is made of different passivation materials, such as a combination of polycrystalline silicon passivation and amorphous / microcrystalline passivation).

[0029] The aforementioned battery includes a battery body, which at least includes a substrate and a doped layer on the substrate. The substrate has a rectangular or square structure and may have four corners, which may or may not include chamfers. When the corners include chamfers, the chamfers may be as follows: Figure 1 The two battery cells shown are formed by curves (arcs) on their left ends, or they can be like... Figure 1 The two battery cells shown are composed of straight lines on their right ends. Figure 1 The example shown only illustrates the corners and does not imply a particular limitation on the shape of the corners. It is understood that the substrate can be a rectangle with at least one corner having a chamfer or a square with at least one corner having a chamfer, which is not the focus of this application and will not be described in detail here.

[0030] The aforementioned HJT battery body has a first surface and a second surface arranged opposite to each other. The first surface can be a light-receiving surface, and the second surface can be a backlighting surface. The doped layer includes n-doped regions and p-doped regions. The p-doped regions are located on the first surface, and the n-doped regions are located on the second surface. The two can also be interchanged as needed, without particular limitation here.

[0031] The aforementioned TOPCon battery body has a first surface and a second surface arranged opposite to each other. The first surface can be a light-receiving surface, and the second surface can be a backlighting surface. The doped layer includes n-doped regions and p-doped regions. The p-doped regions are located on the first surface, and the n-doped regions are located within the second surface. The two can also be interchanged as needed, without particular limitation here.

[0032] The aforementioned IBC battery body includes alternating n-doped regions and p-doped regions disposed on a substrate along a first direction to form an interdigitated doped structure. Electrode structures spaced apart from each other are disposed in the n-doped regions and the p-doped regions, respectively.

[0033] The aforementioned TBC cell body includes a tunneling oxide layer disposed on a substrate, and n-doped and p-doped regions formed by doped polycrystalline silicon layers. The TOPCon structure formed by the stacked tunneling oxide layer and doped polycrystalline silicon layers provides higher carrier lifetime and lower surface recombination compared to IBC cells, thus improving the photoelectric conversion efficiency of TBC cells.

[0034] The aforementioned HBC battery comprises n-doped and p-doped regions on a substrate to form a heterojunction structure. The n-doped regions include, but are not limited to, microcrystalline silicon or amorphous silicon (to provide electrons), while the p-doped regions may also use microcrystalline silicon or amorphous silicon (e.g., using boron as a dopant to provide holes). HBC batteries help improve carrier lifetime and reduce surface recombination. Furthermore, a transparent conductive oxide layer (TCO) can be formed between the surfaces of the n-doped and p-doped regions and the electrodes. This facilitates carrier collection in the doped regions and also provides some anti-reflection effect.

[0035] The battery body of the aforementioned hybrid battery can adopt a layer structure similar to that of an IBC battery or a TBC battery, and on this basis, a corresponding passivation layer structure can be configured, such as a combination of at least two of polycrystalline silicon passivation, amorphous silicon passivation, and microcrystalline silicon passivation.

[0036] The materials used in the aforementioned n-doped and p-doped regions can each independently include one or more semiconductor materials such as monocrystalline silicon, amorphous silicon, polycrystalline silicon, or microcrystalline silicon. n-type doping is achieved by introducing donor impurities, such as group VA elements like phosphorus (P), arsenic (As), or antimony (Sb), into the aforementioned semiconductor materials; p-type doping is achieved by introducing acceptor impurities, such as group IIIA elements like boron (B), aluminum (Al), or gallium (Ga), into the aforementioned semiconductor materials.

[0037] Photovoltaic modules based on any of the above embodiments Figure 1 A partial top view of a photovoltaic module according to an embodiment of this application is shown. Figure 2 A top view of an adhesive portion according to an embodiment of this application is shown. Figure 1 The surface in the text can be any surface of the component, such as the light-facing side or the back-facing side; there are no particular limitations. Figure 1 This is a partial top view of a photovoltaic module composed of bifacial cells. The dimensions of the adhesive dots (adhesive portion 4) in the above figure are for illustrative purposes only and do not represent actual dimensions.

[0038] like Figures 1-2 As shown, the photovoltaic module includes: multiple solar cells 1, multiple current collectors 2, multiple electrical connection wires 3, and multiple adhesive parts 4.

[0039] The solar cell 1 has opposing surfaces. The material of the solar cell 1 can be an n-type, p-type, or intrinsic crystalline silicon substrate, such as a semiconductor material selected from monocrystalline silicon, polycrystalline silicon, and microcrystalline silicon. It can also be an n-type or p-type monocrystalline silicon substrate. The conversion efficiency of solar cells based on monocrystalline silicon substrates is higher than that of other types, such as polycrystalline silicon solar cells. By introducing donor impurities such as group VA elements such as phosphorus (P), arsenic (As), or antimony (Sb) into these semiconductor materials, an n-type crystalline silicon substrate is obtained. Alternatively, by introducing acceptor impurities such as group IIIA elements such as boron (B), aluminum (Al), or gallium (Ga) into these semiconductor materials, a p-type crystalline silicon substrate is obtained.

[0040] Each solar cell 1 includes multiple current collector electrodes 2. The current collector electrodes 2 (also called fine grids, current collector grid lines, sub-grids, etc.) are located on at least one surface of the solar cell 1. The multiple current collector electrodes are positioned in a first direction (e.g., Figure 1 As shown in the left and right directions, they are spaced apart and along the second direction (such as...) intersecting the first direction. Figure 1 Extending in the vertical direction (as shown), it collects the current generated in the solar cell 1. Multiple electrical connecting wires 3 (also called solder strips or interconnecting strips) extend along the first direction and connect adjacent solar cells 1 to connect at least two solar cells in series. The electrical connecting wires 3 are suitable for collecting and transmitting the current collected from the current collector electrode 2.

[0041] It is understood that the aforementioned "multiple collector electrodes 2" can refer to some or all of the collector electrodes. Unless otherwise specified, "multiple collector electrodes 2" in the following text refers to the aforementioned meaning. The aforementioned "collector electrodes 2" generally refers to electrodes that extend continuously or discontinuously in the first direction. The aforementioned "multiple electrical connection lines 3" can refer to some or all of the electrical connection lines. Similarly, "multiple electrical connection lines 3" in the following text refers to the aforementioned meaning.

[0042] Multiple adhesive portions 4 are located on at least one surface of the battery cell 1, bonding and fixing the electrical connection wire 3 to the battery cell 1. The adhesive portions 4 partially cover the electrical connection wire 3, and the adhesive portions 4 have a contact area 41 with the surface of the battery cell 1.

[0043] It is understood that the aforementioned "multiple adhesive portions 4" can refer to some or all of the adhesive portions. Unless otherwise specified, "multiple adhesive portions 4" in the following text refers to the aforementioned meaning.

[0044] The adhesive portion 4 includes a first portion covering the surface of the electrical connection wire 3, the projection of which onto the surface of the battery cell 1 lies within the projection of the electrical connection wire 3 onto the surface of the battery cell 1. The first portion of the adhesive portion 4 covers less of the top of the electrical connection wire than the sides, meaning that the further away from the surface of the battery cell the adhesive portion covers, the less of the surface of the electrical connection wire it covers. Specifically, the length of the top of the first portion along the first direction is less than the length of the contact area 41 along the first direction.

[0045] According to embodiments of this application, the bottom of the adhesive portion 4 is wider along the first direction, providing a larger adhesive area, increasing adhesive force, reducing the likelihood of peeling or displacement of the electrical connection wire 3 during mechanical vibration, wind load, or thermal cycling, and maintaining adhesive effectiveness. Controlling the top of the portion of the adhesive portion 4 covering the electrical connection wire 3 to be shorter along the first direction helps maintain a good adhesive effect while reducing light loss at the location of the adhesive portion 4 and improving light absorption.

[0046] It should be noted that in some embodiments, the adhesive portion 4 can be disposed between adjacent current collector electrodes 2, which helps to strengthen the connection strength between the electrical connection line 3 and the cell 1, and avoids the adhesive portion 4 extending into the space between the electrical connection line 3 and the current collector electrode 2 as an insulating material, so as to affect the current transmission between the two and result in a low yield of the photovoltaic module.

[0047] In other embodiments, the adhesive portion 4 may also cover at least one current collector electrode 2, for example, it may cover two current collector electrodes 2. This arrangement helps to provide effective adhesive strength through the adhesive portion 4, and is particularly suitable for processes where the adhesive portion is prepared after welding.

[0048] Optionally, the plurality of current collector electrodes 2 may include metals (e.g., Ag, Cu, Al, Ni, Au, Zn, Sn, Pb, silver-plated copper or combinations thereof), conductive metal oxides (various TCOs, such as ITO, AZO, IWO, etc.), metal nitrides (TiN, etc.), metal carbides (TiC, etc.), or metal sulfides, as well as other conductive connecting materials (e.g., graphene, etc.), or various combinations thereof.

[0049] Optionally, the current collector electrode 2 can be formed using processes such as printing, physical vapor deposition, or electroplating. Further, printing can be, for example, screen printing, inkjet printing, or laser transfer. The following exemplarily illustrates the process of preparing the current collector electrode 2 by screen printing: preparing a metal paste containing metal powder; using a screen template with a specific pattern to define the position and shape of the current collector electrode 2; pressing the metal paste onto the battery surface through the screen template to form a patterned structure of the current collector electrode 2; removing the solution from the metal paste through a heating and drying process, followed by sintering to achieve good contact between the current collector electrode 2 and the battery cell 1.

[0050] In some embodiments, an auxiliary welding layer may be provided between the electrical connection line 3 and the current collector 2. This layer may be, for example, solder, solder paste, or solder, for welding the current collector to the electrical connection line 3. Alternatively, it may be a conductive bonding layer, such as conductive silver paste or conductive adhesive, for conductive bonding between the current collector 2 and the electrical connection line 3.

[0051] Optionally, the electrical connection wire 3 may be made of materials such as copper, silver, silver-clad copper, copper-aluminum alloy, or copper-clad aluminum.

[0052] Optionally, the electrical connection line 3 and the current collector 2 can be metal strips with various cross-sectional shapes, such as circular, triangular, rectangular, flat, elliptical or chamfered rectangles, etc., and this application does not make any particular limitation in this regard.

[0053] In some embodiments, the adhesive portion 4 can be made of photocurable adhesive or thermosetting adhesive. The adhesive portion 4 has good adhesive strength, can effectively fix the electrical connection wire 3, and has good insulation properties. In photovoltaic modules, one or more adhesive portions 4 can be used to fix an electrical connection wire 3 as needed.

[0054] For example, forming the adhesive portion 4 on the electrical connection wire 3 by photocuring may include: providing a mesh template with a specific pattern and multiple through holes arranged at intervals on the template; placing the mesh template on the surface of the battery cell 1 such that the multiple through holes correspond to the positions on the battery cell 1 where the adhesive portion 4 needs to be applied; performing screen printing to place the adhesive material in the multiple through holes to form an initial adhesive portion on the surface of the electrical connection wire 3 and the battery cell 1; and then curing the initial adhesive portion to form the adhesive portion 4 by ultraviolet light.

[0055] The following sections will elaborate on the specific structural configurations for different types of solar cells.

[0056] For a back-contact battery, the current collector 2 includes a first current collector and a second current collector, which have opposite polarities. Both the first and second current collectors are located on one surface of the battery cell 1 (e.g., the back surface of the battery cell 1). It can be understood that the first current collector can be disposed on a p-doped region to extract charge carriers from the p-doped region; the second current collector can be disposed on an n-doped region to extract charge carriers from the n-doped region. Of course, the first and second current collectors can also be interchanged, and this is not specifically limited here. The adhesive portion 4 can be located between adjacent first and second current collectors to enhance the bonding yield between the electrical connection line 3 and the battery cell 1.

[0057] Figure 1 The illustration shows a bifacial battery (e.g., TOPcon battery, HJT battery, etc.). The current collector 2 includes a first current collector electrode and a second current collector electrode, which have opposite polarities. The first and second current collector electrodes are located on the front and back sides of the battery cell 1, respectively. For example, the first current collector electrode may be located on the front side of the battery cell 1 and the second current collector electrode may be located on the back side of the battery cell 1, or the first current collector electrode may be located on the back side of the battery cell 1 and the second current collector electrode may be located on the front side of the battery cell 1. This application does not impose any particular limitation on this.

[0058] In some embodiments, the photovoltaic module includes multiple cell strings, each containing multiple cells 1, which may be grid-free (OBB) cells; in other embodiments, the cells 1 in the module may be grid-connected cells. Electrical connection lines 3 are connected to the grid, and the grid is connected to the collector electrode 2.

[0059] In some embodiments, the battery cell 1 may include an uncut battery cell or a cut battery cell.

[0060] Among them, non-cut solar cells refer to solar cells where silicon wafers are cut to the required size before solar cell manufacturing.

[0061] Cutting a solar cell refers to the process of cutting a single solar cell into M individual cells, where 2 ≤ M ≤ 8. It can be understood that this application involves cutting a large-sized silicon solar cell (e.g., (90mm~300mm) × (156mm~300mm), where the entire cell can be a square or rectangular sheet) into 2~8 independent cells. Through circuit design, these smaller cells are connected in series to form a battery string, and multiple battery strings are connected to form a photovoltaic module.

[0062] Optionally, M can be, for example, 2, 3, 4, 5, 6, 7 or 8, and this application does not impose any particular limitation on it.

[0063] In some embodiments, the length of the battery cell 1 along the second direction is 156~220mm, and the width along the first direction is 30~150mm.

[0064] Optionally, the length of the battery cell 1 along the second direction may be, for example, 156mm, 180mm, 182mm, 183mm, 185mm, 190mm, 205mm, 210mm, 215mm or 220mm, or a range consisting of any two of the above values.

[0065] Optionally, when M=2, the length of the solar cell along the second direction is 180~220mm, and the width along the first direction is 45~115mm.

[0066] Optionally, the width of the solar cell along the first direction may be, for example, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm, 60mm, 61mm, 62mm, 63mm, 64mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 96mm, 97mm, 98mm, 99mm, 100mm, 101mm, 102mm, 103mm, 104mm, 105mm, 106mm, 107mm, 108mm, 109mm, 110mm, 111mm, 112mm, 113mm, 114mm, or 115mm, or a range consisting of any two of the above values.

[0067] In some embodiments, for example when M=4, the length of the solar cell 1 along the second direction is 180~220mm, and the width along the first direction is 45~60mm. This length and width setting achieves a balance between module power, output current, and overall performance, resulting in better performance. Optionally, the width of the solar cell along the first direction can be, for example, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm, 60mm, or a range consisting of any two of the above values.

[0068] Optionally, the length of the battery cell 1 along the second direction may be, for example, 180mm, 182mm, 183mm, 184mm, 185mm, 190mm, 191mm, 192mm, 193mm, 194mm, 195mm, 200mm, 205mm, 210mm, 215mm or 220mm, or a range consisting of any two of the above values.

[0069] Optionally, the width of the battery cell 1 along the first direction may be, for example, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm or 60mm, or a range consisting of any two of the above values.

[0070] Preferably, the length of the solar cell 1 along the second direction is 182~184mm or 190~220mm, which can make reasonable use of the silicon wafer, reduce raw material waste, be compatible with existing production lines, and avoid large-scale equipment modification. More preferably, it is 191~215mm.

[0071] In some implementations, for example when M=6, the length of the solar cell 1 along the second direction is 180~220mm, and the width along the first direction is 30~40mm. This setting of length and width achieves a balance between module power, output current, and output efficiency, resulting in better overall performance.

[0072] Optionally, the length of the battery cell 1 along the second direction may be, for example, 180mm, 182mm, 183mm, 184mm, 185mm, 190mm, 191mm, 192mm, 193mm, 194mm, 195mm, 200mm, 205mm, 210mm, 215mm or 220mm, or a range consisting of any two of the above values.

[0073] Optionally, the width of the battery cell 1 along the first direction may be, for example, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm or 40mm, or a range consisting of any two of the above values.

[0074] Preferably, the length of the solar cell 1 along the second direction is 182~184mm or 190~220mm, which can make reasonable use of the silicon wafer, reduce raw material waste, be compatible with existing production lines, and avoid large-scale equipment modification.

[0075] In some implementations, such as Figure 2 As shown, it can be understood that the length of the top of the first part along the first direction is less than the length of the contact area 41 along the first direction.

[0076] In some embodiments, the minimum length M1 of the first portion of the adhesive portion 4 along the first direction is less than the distance M2 between the two ends of the contact area 41 along the first direction. It can be understood that, as Figure 2 As shown, on the same electrical connection line 3, there are exposed electrical connection lines 3 at the contact edges of the adhesive part 4 and the electrical connection line 3. A tangent line extending in the second direction is made at the closest endpoints of the exposed electrical connection lines 3. The perpendicular distance between the two tangent lines (which can be understood as the distance along the first direction) can be understood as the shortest distance M1.

[0077] According to an embodiment of this application, by covering the top of the electrical connection wire 3 with the adhesive portion 4, the fixing effect of the electrical connection wire 3 is enhanced, and the length of M1 is reduced. This also takes into account the reflection of incident light by the electrical connection wire, which helps to guide more light into the solar cell 1 and improves light absorption efficiency. This arrangement helps to balance light absorption and component reliability.

[0078] Figure 3 It shows Figure 2 A cross-sectional view of the adhesive portion along the y1 axis; Figure 4 It shows Figure 2 A cross-sectional view of the adhesive portion along the y2 axis; Figure 5 It shows Figure 2 A cross-sectional view of the adhesive portion along the y3 axis. (See attached image.) Figures 2-5 As shown, based on the different cross-sectional shapes of the adhesive portion 4, the positional relationship between the adhesive portion 4 and the electrical connection line 3 is further explained. Figure 3 It can be understood that there is a partial contact between the adhesive part 4 and the electrical connection wire 3. In this case, the electrical connection wire 3 is embedded in the adhesive part 4, and the top of the electrical connection wire 3 is exposed. Since the electrical connection wire 3 is usually formed of metal or alloy, its surface has a metallic luster. Under the illumination of incident light, it can guide part of the light to be ultimately incident into the battery cell 1 by reflection. Figure 4The position can be understood as a cross-sectional view formed by the section near the exposed end of the electrical connector 3. At this time, the top of the electrical connector 3 is relatively less exposed, and more of the electrical connector 3 is embedded in the adhesive part 4, which enhances the fixing effect. Figure 5 The position can be understood as the adhesive portion 4 completely covering the electrical connection wire 3 in the thickness direction at this position, providing a more sufficient fixing effect and strengthening the connection reliability between the electrical connection wire 3 and the battery cell 1.

[0079] Understandable. Figure 3 , Figure 4 It is not limited to the cross-sectional views along the y1 axis or along the y2 axis (perpendicular to the first direction) as described above; it can be as follows: Figure 2 As shown, the positions are symmetrical with y3 as the axis of symmetry. Based on the different degrees of coverage between the adhesive part 4 and the electrical connection line 3 at different positions, a good fixing effect can be ensured while also taking into account the partial exposure of the electrical connection line 3, improving light utilization and thus increasing the power generation of the module.

[0080] Different cross sections can be obtained by microscopic measurement. For example, the adhesive part at different positions can be cut along the second direction to obtain a cross-sectional microscopic image of the adhesive part. Based on the different materials of the adhesive part 4 and the electrical connection line 3, there is an obvious difference in brightness in the microscopic image. The length value at the corresponding position can be directly measured and calculated on the microscopic image.

[0081] In some embodiments, the ratio between the minimum length M1 of the first portion of an adhesive part 4 along the first direction and the distance M2 between the two ends of the contact area 41 of the adhesive part 4 along the first direction is greater than 0.15 and less than 1. This setting helps to improve the fixing effect while maintaining a good reflective effect of the electrical connection wire 3, improving light absorption efficiency, and further balancing light absorption and welding reliability. If the ratio is too large, the adhesive part will cover too much of the electrical connection wire, which will have a negative impact on the light absorption effect; if the ratio is too small, the fixing effect on the electrical connection wire 3 will be reduced.

[0082] Optionally, the ratio between M1 and M2 can be 0.16, 0.17, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or a range consisting of any two of the above values.

[0083] In some embodiments, the minimum length M1 of the first portion along the first direction is 0.5~2mm. This configuration reduces the length of the adhesive portion 4 covering the electrical connection wire 3, further enhancing the light absorption efficiency.

[0084] Optionally, M1 can be, for example, 0.5mm, 0.7mm, 1mm, 1.3mm, 1.5mm, 1.7mm or 2mm, or a range consisting of any two of the above values.

[0085] In some embodiments, the distance M2 between the two ends of the contact area 41 along the first direction is 1 to 3 mm. This arrangement maintains the length of the electrical connection wire 3 covered by the bottom of the adhesive portion 4, further enhancing the fixing effect on the electrical connection wire 3.

[0086] In some embodiments, the projection outline of the adhesive portion 4 on the surface of the battery cell 1 is any one of a rhombus or a rhombus-like shape, an ellipse or a ellipse-like shape; or the projection outline of the adhesive portion 4 on the surface of the battery cell 1 on one side of the electrical connection line 3 along the second direction is any one of a parabola-like shape or a cosine curve. Such an adhesive shape can better achieve sufficient fixation of the electrical connection line 3.

[0087] Figure 6 It shows Figure 2 A cross-sectional view of the adhesive portion along the x1 axis of electrical connection line 3. (See attached image.) Figure 6 As shown, along the extension direction of electrical connection line 3 (along the first direction), the height of the first part first increases and then decreases.

[0088] In some embodiments, the edge line of the coverage area formed by the first portion of the adhesive portion 4 on the surface of the electrical connection line 3 is curved. Figure 7 A side view of the adhesive portion according to an embodiment of this application is shown. Figure 7 As shown, this curved shape can avoid becoming a stress concentration point, which helps to disperse stress and thus improve the connection strength between the adhesive part 4 and the electrical connection line 3, and strengthen the fixing effect.

[0089] In some embodiments, the ratio of the distance M2 between the two ends of the contact area 41 along the first direction to the distance K between the two ends of the contact area along the second direction is 1 to 2. This arrangement can improve the adhesion between the electrical connection wire 3 and the battery cell 1.

[0090] Optionally, the ratio between the distance M2 between the two ends of the contact area 41 along the first direction and the distance K between the two ends of the contact area along the second direction can be, for example, 1, 1.2, 1.4, 1.6, 1.8 or 2, or a range consisting of any two of the above values.

[0091] In some embodiments, the distance K between the two ends of the contact area 41 along the second direction is 1~3mm. This setting helps to improve the fixing effect while saving the amount of adhesive material used, thus saving costs.

[0092] Optionally, the distance K between the two ends of the contact area 41 along the second direction can be, for example, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm, or a range consisting of any two of the above values.

[0093] In some embodiments, the thickness of the first portion above the top of the electrical connection wire 3 is >0 and ≤0.05mm. For example... Figure 6 As shown, the first part above the top of the electrical connection line 3 exhibits a thickness variation that first increases and then decreases.

[0094] It should be noted that, unless otherwise specified, “thickness” generally refers to the dimension of an object in the direction perpendicular to the surface of the battery cell 1.

[0095] Optionally, the thickness of the first part may be, for example, 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm or 0.05 mm, or a range consisting of any two of the above values.

[0096] In some embodiments, the ratio between the height of the adhesive portion 4 and the height of the electrical connection line 3 relative to the surface of the solar cell 1 is greater than 1 and ≤ 1.3. It can be understood that the heights of both the adhesive portion 4 and the electrical connection line 3 are based on the vertical distance from the surface of the solar cell 1. The height of the adhesive portion 4 can be understood as the maximum distance between the adhesive portion 4 and the solar cell 1 in the direction perpendicular to the surface of the solar cell 1. In the case of partial coverage, the thicknesses of both are set in this way to further enhance the secure fixation of the electrical connection line 3. If the ratio is too small, it is difficult to provide sufficient fixation, and the electrical connection line 3 may detach under impact, thus affecting the stability of the module; if the ratio is too large, the coverage is thicker, flatness is reduced, the amount of adhesive film used increases, and the cost is higher.

[0097] Optionally, the ratio between the height of the adhesive portion 4 and the height of the electrical connection wire 3 can be, for example, 1.1, 1.15, 1.2, 1.25 or 1.3, or a range consisting of any two of the above values.

[0098] In some embodiments, the ratio of the distance M2 between the two ends of the contact area 41 in the first direction to the distance between two adjacent current collector electrodes 2 is (0.8~3.5):1. This arrangement helps to form a more secure fixation for the electrical connection wire 3, improves the connection between the electrical connection wire 3 and the battery cell 1, and, when subjected to impact, can prevent the welding position between the electrical connection wire 3 and the current collector electrode 2 from being directly stressed by the fixing effect of the adhesive part 4, thereby avoiding situations such as poor welding or broken welding, and strengthening the connection effect between the three.

[0099] It should be noted that the adhesive part 4 can cover the connection position between multiple adjacent current collectors 2 and electrical connection lines 3, reducing the possibility of broken solder joints or incomplete solder joints caused by direct force at the connection point; it can also cover the connection position between an adjacent current collector 2 and electrical connection line 3, and this application does not make any special limitation in this regard.

[0100] Optionally, the ratio of the distance M2 between the two ends of the contact area 41 in the first direction to the distance between the two adjacent collector electrodes 2 can be, for example, 0.8:1, 1:1, 1.2:1, 1.5:1, 2:1, 2.5:1, 3:1 or 3.5:1.

[0101] Preferably, the ratio of the distance M2 between the two ends of the contact area 41 in the first direction to the distance between two adjacent current collectors 2 is greater than 1 and less than 3.5. This arrangement allows the adhesive portion 4 to cover two or more current collectors 2, strengthening the contact knot and improving the fixing effect.

[0102] In some implementations... Figure 8 A partial top view of the adhesive portion according to an embodiment of this application is shown. Figure 8 As shown, the vertical distance A between one end of the adhesive portion 4 along the second direction and the electrical connection line 3 is a. The ratio of A to the width X of the electrical connection line 3 along the second direction is A = aX, and 2 ≤ a ≤ 8. This helps to save on the cost of materials used in the adhesive portion 4 and improves the bonding yield between the electrical connection line 3 and the battery cell 1.

[0103] For example, 'a' can be 2, 3, 4, 5, 6, 7, or 8, or a range consisting of any two of the above values.

[0104] In some embodiments, the width X of the electrical connection wire 3 along the second direction is ≥0.1mm and ≤2mm. Within this width range, it is beneficial to achieve a better welding effect.

[0105] Optionally, the width X of the electrical connection line 3 along the second direction can be, for example, 0.1mm, 0.25mm, 0.5mm, 0.75mm, 1mm, 1.5mm or 2mm, or a range consisting of any two of the above values.

[0106] As mentioned above, the electrical connection wire 3 can have a cross-sectional area of ​​any shape. For example, taking a circular cross-sectional area as an example, the width X of the electrical connection wire 3 along the second direction can be understood as its diameter. Preferably, the diameter of the electrical connection wire 3 is ≥0.1mm and ≤0.4mm. More preferably, the diameter of the electrical connection wire 3 is ≥0.2mm and ≤0.3mm. Even more preferably, the diameter of the electrical connection wire 3 is ≥0.22mm and ≤0.26mm. This configuration enhances the connection effect between the electrical connection wire 3 and the battery cell.

[0107] Taking a square cross-sectional area for the electrical connector 3 as an example, the width X of the square electrical connector along the second direction is ≥0.5mm and X≤2mm; preferably, the width of the square electrical connector along the second direction is ≥0.5mm and X≤1mm. Preferably, the width is 0.6mm or 0.8mm.

[0108] In some embodiments, the contact area 41 is spaced M2 at both ends in the first direction, and the edge of the contact area 41 has a contour line. The area enclosed by the contour line and the electrical connection line 3 along either side of the second direction is S, where S satisfies: A is consistent with the previous description and will not be repeated here.

[0109] The area S can be understood as the area enclosed by the edge contour of the adhesive part 4 on either side of the electrical connection line 3 along the second direction on the surface of the cell 1 and the boundary of the electrical connection line 3 projected perpendicular to the direction of the cell 1. The edge contour can be obtained through image capture or other methods. Setting the area S within the aforementioned range further ensures that the adhesive part 4 provides sufficient fixation for the electrical connection line 3, improving the yield of the photovoltaic module; it also avoids waste of adhesive material. If the area S is too large, it will result in waste of adhesive material and may come into contact with adjacent current collector electrodes 2, adversely affecting conductivity; if the area S is too small, it will not provide adequate fixation, and the electrical connection line 3 may detach, reducing the reliability of the connection between the electrical connection line 3 and the cell 1.

[0110] In some embodiments, the battery cell 1 includes an adjacent intermediate region and an edge region, with the edge region disposed around the intermediate region along a first direction. The adhesive portion 4 located in the edge region is aligned along a second direction. For example... Figure 1 As shown, this setup can be achieved using a uniform mesh template, making the process relatively simple. The adhesive portions 4 in the middle area are staggered along the second direction. Continuing as... Figure 1 As shown, the adhesive portions 4 in the middle region are staggered, so that at different positions in the second direction, the adhesive portions 4 fix different current collectors 2 and electrical connection lines 3 respectively, reducing the risk of them breaking apart and enhancing the current collection effect of electrical connection lines 3 on current collectors 2.

[0111] In some embodiments, the distance between the geometric center of the adhesive portion 4 located on an electrical connection line 3 closest to the edge of the battery cell and the edge of the battery cell is s, where s ≥ 4 mm and ≤ 24 mm. Figure 9 A partial top view of a photovoltaic module near the edge of an embodiment of this application is shown. (See attached image.) Figure 9As shown, this configuration ensures the connection between the electrical connection wire 3 and the solar cell 1, preventing bending or warping of the electrical connection wire 3 at the edge of the solar cell and improving the module yield. If s is too large, warping of the electrical connection wire 3 at the edge may occur, leading to poor contact when the solar cells 1 are connected in series. If s is too small, there are more restrictions on the electrical connection wire 3, making it rigid and difficult to bend to a certain extent, which greatly limits the flexibility between the interconnected solar cells 1.

[0112] Optionally, s can be, for example, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm or 24mm, or a range consisting of any two of the above values.

[0113] It should be noted that during the process of connecting multiple solar cells in series to form a battery string, if the outermost bonding portion 4 of adjacent solar cells deviates from the preset bonding position, the bonding effect between the electrical connection wire 3 and the solar cell 1 may be poor, potentially leading to issues such as poor soldering or low module reliability. Adjusting s within the aforementioned range can further improve the connection strength between the end of the electrical connection wire 3 and the solar cell 1, thereby improving module reliability.

[0114] It is understandable that when adhesive is applied to both surfaces of the battery cell 1, the adhesive portions 4 on the two surfaces of the battery cell 1 are staggered in the thickness direction to prevent the battery cell 1 from being raised in the same position, which could cause stress concentration during subsequent lamination, resulting in cracking, microcracks, bending, or other issues with the battery cell 1.

[0115] In some embodiments, the photovoltaic module may further include a connecting electrode (not shown in the figure), which may be in direct contact with the current collector electrode 2 or be part of the current collector electrode. The connecting electrode may include a portion extending along a first direction or a second direction. The connecting electrode may be a portion on the current collector electrode 2 for conductive interconnection, or it may be a thickened section or pad on the current collector electrode 2 that connects to the electrical connection line 3. Of course, an auxiliary soldering layer may also be provided between the connecting electrode and the electrical connection line 3. The auxiliary soldering layer may be, for example, solder paste, such as solder, for soldering the current collector electrode 2 and the electrical connection line 3 together; or it may be a conductive adhesive layer, such as conductive silver paste, conductive adhesive, etc., for conductive bonding between the current collector electrode 2 and the electrical connection line 3.

[0116] In some embodiments, the photovoltaic module may include connecting electrodes, and the adhesive portion 4 located in the edge region may be misaligned with the connecting electrodes. This arrangement, similar to the aforementioned, avoids excessive stress caused by excessively high local elevations, thus preventing the risk of microcracks or fragmentation during lamination.

[0117] In some embodiments, the distance between the geometric centers of adjacent adhesive portions 4 located on the same electrical connection line 3 is d, where d ≤ 16 mm. Continuing as... Figure 9 As shown, if d is greater than the aforementioned range, the fixing effect on the electrical connection line 3 is weaker, and movement of the electrical connection line 3 may cause the current collector electrode 2 to be pulled off. It should be noted that a smaller d is not necessarily better. If d is smaller, more adhesive parts 4 are required, increasing the cost of adhesive materials and negatively impacting the photoelectric conversion efficiency of the component. Due to the limitations of the screen printing process, d needs to be >0.1mm.

[0118] Optionally, d can be, for example, 1mm, 3mm, 5mm, 7mm, 9mm, 11mm, 13mm, 15mm or 16mm, or a range consisting of any two of the above values.

[0119] Understandably, the number of adhesive portions on each of the multiple electrical connection wires 3 can be the same or different, and can be adjusted according to the actual situation.

[0120] In some embodiments, the battery string further includes: a plurality of end connection points (not shown in the figure) and at least two extended electrodes (not shown in the figure). The plurality of end connection points are located at both ends of the battery cell along a first direction. The plurality of end connection points can be arranged parallel to each other along the first direction at the connection positions of the electrical connection line 3 and the current collector electrode 2, fixing the electrical connection line 3 on the battery cell and meeting the tensile strength requirements required by the process. In some embodiments, a plurality of end connection points can be provided in each edge region, and the width of the plurality of end connection points gradually increases along the second direction in the direction pointing from the first direction to the edge of the battery cell. That is, the end connection point with the largest size is located at the outermost edge. This arrangement strengthens the connection strength of the electrical connection line 3 near the edge of the battery cell and improves the yield of the module. In other embodiments, the width of the plurality of end connection points along the second direction can be the same in the direction pointing from the first direction to the edge of the battery cell, and the plurality of end connection points 7 can be arranged at intervals. The interval arrangement can be understood as the provision of end connection points on a portion of the current collector electrode 2 near the edge of the battery cell. This configuration ensures good connection strength of the electrical connection line 3 near the edge of the battery cell while reducing the waste of welding materials and saving costs.

[0121] At least two extended electrodes are connected to the end connection point closest to the edge of the solar cell and extend towards the edge of the solar cell, forming a harpoon structure with the end connection point. The harpoon structure can be understood as a U-shaped structure.

[0122] In some embodiments, the adhesive portion 4 near the edge of the solar cell can be located within the harpoon structure. This arrangement provides a securing effect on the electrical connection wire 3 through the adhesive portion 4, reducing the pulling force on the end connection point when the electrical connection wire 3 is bent or impacted at the edge, strengthening the connection between the electrical connection wire 3 and the current collector 2, and improving the yield of the assembly. In other embodiments, the adhesive portion near the edge of the solar cell can be located on the end connection point 7. This arrangement strengthens the connection effect of the electrical connection wire 3.

[0123] It should be noted that in bifacial batteries, the electrical connection line 3 on the front side of the first battery cell needs to be connected to the back side of the adjacent second battery cell. This requires the electrical connection line 3 to have a relatively large bending range. The adhesive part 4 can be omitted from the harpoon structure, reducing the risk of microcracks or breakage in the edge area of ​​the battery cell 1.

[0124] In some embodiments, the photovoltaic module may also include a bus electrode (not shown in the figure), which may extend along a first direction and connect two end connection points corresponding to the first direction.

[0125] The position of the bus electrode can be set to correspond to the electrical connection line 3 to improve the current collection effect of the electrical connection line 3.

[0126] In some embodiments, in a bifacial battery, the bus electrode is electrically connected to the current collector 2, and the two end connection points corresponding along a first direction are connected. At least a portion of the electrical connection lines 3 can be electrically connected to the current collector 2 through the bus electrode. In other embodiments, in a back-contact battery, the bus electrode is electrically connected to the same-polarity current collector 2 and electrically isolated from the opposite-polarity current collector 2, and the two end connection points corresponding along a first direction are connected. At least a portion of the electrical connection lines 3 can be electrically connected to the current collector 2 through the bus electrode.

[0127] In some embodiments, the number of electrical connection lines 3 on the same surface of the battery cell 1 is greater than or equal to the number of bus electrodes.

[0128] In some implementations, the bus electrode also includes an extended electrode portion that extends into the harpoon structure to enhance the safety redundancy of current collection.

[0129] The photovoltaic module of this application also includes an encapsulation structure, which may include a backsheet, an encapsulating film, a glass panel, etc., to improve the stability of the solar cell string. The glass panel is located on the front of the solar cell, and the backsheet is located on the back of the solar cell, both serving a protective function. The encapsulating film is a filling film between the solar cell and the glass panel and backsheet, serving to encapsulate and bond the solar cell; preferably, a transparent material is used.

[0130] In some embodiments, the spacing between adjacent solar cells 1 along the first direction is -2 to 0 mm. This arrangement helps to increase the effective light-receiving area of ​​the module and improve the module's output power.

[0131] For example, the spacing between adjacent battery cells 1 along the first direction can be, for example, -2mm, -1.5mm, -1mm, -0.5mm or 0mm, preferably -1 to 0mm.

[0132] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A photovoltaic module, comprising: Multiple battery cells; Each of the solar cells includes a plurality of current collectors located on at least one surface of the solar cell; the plurality of current collectors are spaced apart in a first direction and extend along a second direction intersecting the first direction; Multiple electrical connection lines extend along a first direction and connect adjacent battery cells; Multiple adhesive portions are located on at least one surface of the battery cell to bond the electrical connection wire and the battery cell, and the multiple adhesive portions cover a portion of the surface of the electrical connection wire, and the adhesive portions have a contact area with the surface of the battery cell; The adhesive portion includes a first portion covering the surface of the electrical connection wire, the projection of the first portion on the surface of the battery cell being located within the projection of the electrical connection wire on the surface of the battery cell; the first portion covers the top of the electrical connection wire, and the minimum length of the top of the first portion along a first direction is less than the distance between the two ends of the contact area along the first direction.

2. The photovoltaic module according to claim 1, wherein, The ratio between the minimum length of the first portion of the adhesive part along the first direction and the distance between the two ends of the contact area of ​​the adhesive part along the first direction is greater than 0.15 and less than 1; and / or, The minimum length of the first part along the first direction is 0.5~2mm, and the distance between the two ends of the contact area along the first direction is 1~3mm.

3. The photovoltaic module according to claim 1, wherein, The projection outline of the adhesive portion on the surface of the battery cell is any one of rhombus or rhombus-like shape, ellipse or ellipse-like shape; Alternatively, the projection profile of the adhesive portion on the surface of the battery cell can be either a parabolic shape or a cosine curve on one side of the electrical connection line along the second direction.

4. The photovoltaic module according to claim 1, wherein, The edge line of the coverage area formed by the first part on the surface of the electrical connection wire is curved.

5. The photovoltaic module according to any one of claims 1 to 4, wherein, The ratio of the distance between the two ends of the contact area along the first direction to the distance between the two ends of the contact area along the second direction is 1 to 2; and / or, The distance between the two ends of the contact area along the second direction is 1~3mm.

6. The photovoltaic module according to any one of claims 1 to 4, wherein, Above the top of the electrical connection wire, the thickness of the first portion is >0 and ≤0.05mm.

7. The photovoltaic module according to any one of claims 1 to 4, wherein, The ratio between the height of the adhesive portion and the height of the electrical connection wire relative to the surface of the battery cell is greater than 1 and less than or equal to 1.

3.

8. The photovoltaic module according to any one of claims 1 to 4, wherein, The ratio of the distance between the two ends of the contact area in the first direction to the distance between two adjacent current collector electrodes along the first direction is (0.8~3.5):

1.

9. The photovoltaic module according to any one of claims 1 to 4, wherein, The current collector includes a first current collector and a second current collector, the first current collector and the second current collector having opposite polarities. The first current collector and the second current collector are located on the same surface of the battery cell; Alternatively, the first current collector electrode may be located on the front side of the solar cell, and the second current collector electrode may be located on the back side of the solar cell.

10. The photovoltaic module according to any one of claims 1 to 4, wherein, In one of the solar cells, the distance between the geometric center of the adhesive portion located on the electrical connection line closest to the edge of the solar cell and the edge of the solar cell is s, where s ≥ 4 mm and ≤ 24 mm.

11. The photovoltaic module according to any one of claims 1 to 4, wherein, The distance between the geometric centers of adjacent adhesive portions located on the same electrical connection line is d, where d ≤ 16 mm.

12. The photovoltaic module according to any one of claims 1 to 4, wherein, The battery cell includes an adjacent intermediate region and an edge region, wherein the edge regions are located on both sides of the intermediate region along the first direction; The adhesive portions located in the edge region are aligned along the second direction; and / or, the adhesive portions located in the middle region are staggered relative to each other along the second direction.

13. The photovoltaic module according to any one of claims 1 to 4, wherein, The photovoltaic module also includes: Multiple end connection points are located at both ends of the battery cell along the first direction; At least two extended electrodes are connected to the two ends of the end connection point closest to the edge of the battery and extend toward the edge of the battery cell, the extended electrodes and the end connection point forming a harpoon structure; The adhesive portion near the edge of the battery cell is located within the harpoon structure or at the end connection point.

14. The photovoltaic module according to claim 13, wherein, The photovoltaic module also includes: A bus electrode extends along a first direction and is electrically connected to at least a portion of the current collector electrode, connecting two end connection points corresponding to each other along the first direction; or... A bus electrode extends along a first direction, the bus electrode is electrically connected to at least a portion of the collector electrode of the same polarity, the bus electrode is electrically isolated from the collector electrode of the opposite polarity, and connects two end connection points corresponding to each other along the first direction.

15. The photovoltaic module according to claim 14, wherein, The number of electrical connection lines on the same surface of the battery cell is greater than or equal to the number of bus electrodes; And / or, the bus electrode further includes an extended electrode portion extending into the harpoon structure.

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