A photovoltaic module

Abstract

The application provides a photovoltaic module, which comprises a cell, a solder strip and a pad strip. The photovoltaic module comprises at least two cells, and the cell is provided with a grid line. The end of the grid line has a fish-tail structure. The solder strip is connected with the grid line, and adjacent cells are connected through the solder strip. The pad strip is arranged on the side of the solder strip away from the cell. The pad strip covers the whole fish-tail structure and part of the solder strip, and the pad strip can be bonded with the cell. The pad strip is used for improving the stability of the connection between the solder strip and the cell, thereby reducing the risk of separation between the solder strip and the cell and improving the reliability of the photovoltaic module.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic module. Background Art

[0002] Photovoltaic power generation is an important new energy technology at present. Photovoltaic modules are components that use the photovoltaic effect to generate electricity. They are usually composed of solar cells, films, glass, and cover plates. Solar cells are an important component of the main components. The welding performance of solar cells at the component end directly affects the power generation performance and power of the component.

[0003] The reliability of photovoltaic modules is the guarantee of long-term outdoor stability of the modules. If the reliability fails, the service life and safety performance of the modules cannot be guaranteed. The existing packaging solution is to lay a conventional adhesive film after the cells are welded into strings, and then laminate and cure to form a complete module. When stringing, the welding ribbon is connected from the front of the previous cell to the back of the next cell for interconnection. At the interconnection point between the two cells, there is a certain height difference between the welding wire and the cell, and the connection between the welding wire and the cell is relatively weak. When encountering extreme high temperature environments or the impact of wind, sand, rain and snow in outdoor environments, thermal stress is transmitted inward through this point, which may eventually cause the welding ribbon on the interconnection side to detach from the cell, resulting in poor soldering of the cell, and the EL display of the module to turn black, which leads to reliability failure. Summary of the Invention

[0004] In view of this, the present application provides a photovoltaic module to solve the problem of poor reliability of photovoltaic modules in the prior art.

[0005] The present invention provides a photovoltaic module, comprising:

[0006] welding ribbon;

[0007] Solar cells, the photovoltaic module includes at least two of the solar cells, the solar cells are provided with grid lines, the ends of the grid lines have a harpoon structure, the welding strips are connected to the grid lines, and the adjacent solar cells are connected by the welding strips;

[0008] A gasket is provided on a side of the welding strip away from the battery cell, and covers the entire harpoon structure and a portion of the welding strip.

[0009] The application also provides a pad strip. The pad strip is arranged on the side of the solder strip away from the battery piece, covers the entire fish-tail structure and part of the solder strip, and can be bonded to the battery piece. The pad strip is used to improve the stability of the connection between the solder strip and the battery piece, thereby reducing the risk of the solder strip separating from the battery piece and improving the reliability of the photovoltaic module. Specifically, the pad strip can be arranged on the battery piece by adhesion, so that the pad strip can generate a pressure on the solder strip towards the battery piece. When the solder strip is subjected to an external force, such as a force in the direction of peeling the battery piece, the pressure of the pad strip on the solder strip can offset the external force, so that the solder strip can be stably arranged on the surface of the battery piece, reducing the possibility of the solder strip separating when subjected to an external force, and being conducive to improving the stability and service life of the photovoltaic module.

[0010] The solder strip is arranged on the surface of the battery piece and protrudes relative to the surface of the battery piece. The difference in the thickness direction will cause the connection between the solder strip and the battery piece to be relatively weak. Especially when the photovoltaic module is subjected to pressure, the solder strip may fail. The pad strip can fill the height difference between the solder strip and the battery piece and also provide additional mechanical support, thereby enhancing the reliability and stability of the connection between the solder strip and the battery piece. The pad strip can reduce the transmission of thermal stress from the connection between the solder strip and the battery piece to the inside under the impact of extreme temperature environments or wind, sand, rain and snow in the outdoors, thereby reducing the risk of the solder strip separating from the battery piece and improving the overall reliability of the photovoltaic module. In addition, the pad strip helps to improve the durability of the photovoltaic module during long-term operation by reducing the mechanical stress concentration at the connection between the solder strip and the battery piece. The pad strip helps to prolong the service life of the photovoltaic module and reduce maintenance costs. In summary, the pad strip improves the overall reliability and durability of the photovoltaic module by filling the height difference between the solder strip and the battery piece and improving the stability of the connection between the solder strip and the battery piece.

[0011] In a possible implementation, the pad strip has a gap with the edge of the battery piece along the width direction of the photovoltaic module.

[0012] In a possible implementation, the size of the gap along the length direction of the photovoltaic module is L1, and L1≤4mm.

[0013] In a possible implementation, the size of the pad strip along the width direction of the photovoltaic module is L2, and 10mm≤L2≤15mm.

[0014] In a possible implementation, the size of the pad strip in the thickness direction of the photovoltaic module is H1, and 50μm≤H1≤150μm.

[0015] In a possible implementation, the battery piece is provided with a solder joint connecting the battery piece and the solder strip, and the pad strip has a gap with the solder joint along the width direction of the photovoltaic module.

[0016] In a possible implementation, the material of the pad strip is one of polyethylene-polyvinyl acetate copolymer or polyolefin elastomer.

[0017] In a possible implementation, the photovoltaic module includes a plurality of the pad strips, and the plurality of the pad strips are arranged along the width direction of the photovoltaic module, and the pad strips are respectively arranged corresponding to the fish-tail structures.

[0018] In a possible implementation, one end of the solder strip is connected to the front surface of the cell, the other end of the solder strip is connected to the back surface of another cell, and the photovoltaic module includes a plurality of the pad strips, and the pad strips are respectively arranged on the front surface and the back surface of the cell.

[0019] In a possible implementation, one cell is provided with a plurality of the grid lines, and one pad strip covers a plurality of the fish-tail structures. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 The structural diagram of one embodiment of the cell connection structure provided by the present application is shown in the following figure:

[0022] Figure 2 The structural diagram of one embodiment of the cell connection structure provided by the present application is shown in the following figure: Figure 1 The partial enlarged view of the cell connection structure provided by the present application is shown in the following figure:

[0023] Figure 3 The exploded view of one embodiment of the photovoltaic module provided by the present application is shown in the following figure.

[0024] Explanation of reference signs:

[0025] 1-cell;

[0026] 2-grid line;

[0027] 21-fish-tail structure;

[0028] 3-solder strip;

[0029] 4-pad strip;

[0030] 5-solder joint;

[0031] 6-front glass;

[0032] 7-front film;

[0033] 8-back film;

[0034] 9- Back glass;

[0035] X-width direction;

[0036] Y-length direction. DETAILED DESCRIPTION

[0037] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0038] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0039] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0040] It should be understood that the term "and / or" as used herein simply describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the associated objects.

[0041] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides a photovoltaic module, which includes a cell 1, a welding ribbon 3 and a gasket 4.

[0042] The photovoltaic module at least includes two cell pieces 1, the cell piece 1 is provided with a grid line 2, the end of the grid line 2 has a fish-tail structure 21, a solder strip 3 is connected with the grid line 2, and adjacent cell pieces 1 are connected through the solder strip 3. The cell piece 1 is the core component of the photovoltaic module, which is used to convert light energy into electrical energy, and the photovoltaic module is connected in series or parallel through the arrangement of multiple cell pieces 1, so as to improve the output power and voltage, and facilitate the actual use of electrical energy. The cell piece 1 is provided with multiple grid lines 2, the grid lines 2 can be arranged at intervals along the width direction X or the length direction Y of the photovoltaic module, and the grid lines 2 are used to collect and transmit the current generated by the cell piece 1, wherein the grid lines 2 can include main grids and fine grids, and the grid lines 2 can also be all arranged as fine grids, and the types and quantities of the grid lines 2 are not limited here. The grid line 2 is made of silver or copper and the like with high conductivity, and is formed through printing and sintering process. The grid line 2 has a fish-tail structure 21 at a position close to the edge of the cell piece 1, the fish-tail structure 21 can reduce the transmission distance of the current in the grid line 2, thereby reducing the resistance of the cell, and can reduce the shading area of the grid line 2 to the cell piece 1, improve the photoelectric conversion efficiency of the cell piece 1, and the arrangement of the fish-tail structure 21 can reduce the amount of manufacturing material of the grid line 2, thereby facilitating the reduction of the processing cost of the cell piece 1.

[0043] The photovoltaic module provided by the embodiment of the present application includes multiple cell pieces 1, adjacent cell pieces 1 are connected through a solder strip 3, the solder strip 3 is used to connect the cell pieces 1 in series or parallel, and plays a role of current transmission, for example, one end of the solder strip 3 is connected with the front surface of the cell piece 1, and the other end is connected with the back surface of another cell piece 1, so as to realize the interconnection effect.

[0044] After the photovoltaic module is processed, reliability tests such as low-temperature cycle test and wet freezing test need to be carried out, at this time, the thermal stress received by the photovoltaic module will be transmitted to the inside of the photovoltaic module, and with the progress of the experiment and test, the stress can cause the solder strip 3 and the cell piece 1 to separate, thereby causing false welding and reliability failure, which will affect the service life and efficiency of the cell piece 1, and for the same reason, the photovoltaic module arranged in the outdoor environment can also affect the normal work of the photovoltaic module due to the similar principle. The embodiment of the present application also provides a pad strip 4, the pad strip 4 is arranged on the side of the solder strip 3 away from the cell piece 1, the pad strip 4 covers the whole fish-tail structure 21 and part of the solder strip 3, and the pad strip 4 can be bonded with the cell piece 1, the pad strip 4 is used to improve the stability of the connection between the solder strip 3 and the cell piece 1, thereby reducing the risk of separation of the solder strip 3 and the cell piece 1, and improving the reliability of the photovoltaic module. Specifically, the position where the solder strip 3 is connected with the cell piece 1 is located in the area where the fish-tail structure 21 is arranged, and the pad strip 4 covers the whole fish-tail structure 21, so the pad strip 4 can reinforce the position where the solder strip 3 is connected with the cell piece 1.

[0045] The pad strip 4 can be arranged on the battery sheet 1 by adhesive bonding, so that the pad strip 4 can generate pressure on the solder strip 3 towards the direction close to the battery sheet 1. When the solder strip 3 is subjected to external force, for example, the solder strip 3 is subjected to external force in the direction of peeling off the battery sheet 1, the pressure of the pad strip 4 on the solder strip 3 can offset the external force, so that the solder strip 3 can be stably arranged on the surface of the battery sheet 1, reducing the possibility of the solder strip 3 being separated when subjected to external force, and facilitating to improve the stability and service life of the photovoltaic module.

[0046] The solder strip 3 is arranged on the surface of the battery sheet 1, and the solder strip 3 is protruded relative to the surface of the battery sheet 1. The difference in thickness direction will cause the connection between the solder strip 3 and the battery sheet 1 to be relatively weak. Especially when the photovoltaic module is subjected to pressure, the solder strip 3 may fail. The pad strip 4 can fill the height difference between the solder strip 3 and the battery sheet 1, and also provide additional mechanical support, thereby enhancing the reliability and stability of the connection between the solder strip 3 and the battery sheet 1. It can reduce the transmission of thermal stress from the connection between the solder strip 3 and the battery sheet 1 to the inside under the impact of extreme temperature environment or wind, sand, rain and snow in the outdoor, thereby reducing the risk of the solder strip 3 and the battery sheet 1 being separated, and improving the overall reliability of the photovoltaic module. In addition, the arrangement of the pad strip 4 helps to improve the durability of the photovoltaic module. By reducing the mechanical stress concentration at the connection between the solder strip 3 and the battery sheet 1, the pad strip 4 helps to prolong the service life of the photovoltaic module and reduce the maintenance cost. In summary, the pad strip 4 improves the overall reliability and durability of the photovoltaic module by filling the height difference between the solder strip 3 and the battery sheet 1 and enhancing the stability of the connection between the solder strip 3 and the battery sheet 1.

[0047] In addition, the present embodiment does not limit the structure of the battery sheet 1, and the types of the battery sheet 1 include but are not limited to Passivated Emitter Rear Cell (PERC), Tunnel Oxide Passivated Contact (TOPCon), Heterojunction with Intrins ic Thin-film (HJT), Interdigitated Back Contact (IBC), perovskite cell, etc.

[0048] For the PERC cell, along its thickness direction, the PERC cell includes a front surface metal silver electrode, a front surface silicon nitride passivation layer, a phosphorus layer emitter, a P-type base silicon layer, a local aluminum back field, a metal aluminum back electrode, and a back passivation layer (Al2O3 / SiNx) in sequence. The PERC cell adopts a passivation film to passivate the back surface, replaces the full aluminum back field, enhances the internal back reflection of light on the silicon base, reduces the back surface recombination rate, and improves the efficiency of the cell by 0.5%-1%.

[0049] For the TOPCon cell, along its thickness direction, the TOPCon cell comprises, in sequence, a metal silver electrode, a front surface silicon nitride passivation layer, a boron-doped emitter, an N-type base silicon layer, a diffusion-doped layer, an ultra-thin silicon oxide, a doped polysilicon, a silicon nitride, and a metal silver electrode. The back surface of the cell is composed of an ultra-thin silicon oxide layer (1 nm-2 nm) and a phosphorus-doped microcrystalline and amorphous mixed Si thin film, which together form a passivation contact structure. This structure can block the recombination of minority carriers, and improve the open-circuit voltage and short-circuit current of the cell. The ultra-thin oxide layer allows the majority carriers to tunnel into the polysilicon layer while blocking the recombination of minority carriers. The good passivation effect of the ultra-thin silicon oxide and the heavily doped silicon thin film causes the energy band of the silicon wafer surface to bend, thereby forming a field passivation effect. The probability of electron tunneling increases significantly, the contact resistance decreases, and the open-circuit voltage and short-circuit current of the cell are improved, thereby improving the conversion efficiency of the cell.

[0050] For the HJT cell, along its thickness direction, the HJT cell comprises, in sequence, a front low-temperature silver electrode, a front conductive thin film, an N-type amorphous silicon thin film, an intrinsic amorphous silicon thin film, an N-type base silicon layer, an intrinsic amorphous silicon thin film, a P-type amorphous silicon thin film, a back conductive thin film, and a back low-temperature silver electrode.

[0051] For the IBC cell, along its thickness direction, the IBC cell comprises, in sequence, a silicon nitride back layer, an N+ front surface field, an N-type base silicon layer, a P+ emitter, an N+ back field, an aluminum oxide passivation layer, a silicon nitride anti-reflection layer, and a metal silver electrode. The IBC cell uses ion implantation technology to obtain P and N regions with good uniformity and accurately controllable junction depth. The cell front surface is not blocked by grid lines 2, which can eliminate the shading current loss of the metal electrode, maximize the utilization of incident photons, and increase the short-circuit current by about 7% compared with conventional solar cells. Due to the back contact structure, there is no need to consider the grid line 2 shading problem, and the proportion of grid line 2 can be appropriately widened, thereby reducing the series resistance and having a high fill factor. The surface passivation and surface light trapping structure can be optimally designed to obtain a lower front surface recombination rate and surface reflection.

[0052] For the perovskite cell, along its thickness direction, the perovskite cell comprises, in sequence, a substrate material, a conductive thin film, an electron transport layer (titanium dioxide), a perovskite absorption layer (hole transport layer), and a metal cathode. Perovskite material has a high light absorption coefficient and a long carrier diffusion distance. After the absorbed photons are converted into electrons, they are easily collected by the electrode with little loss, thus generating a high photovoltage and current, making perovskite exhibit high photoelectric conversion efficiency.

[0053] In one possible implementation, the pad strip 4 has a gap with the edge of the cell sheet 1 along the width direction X of the photovoltaic module.

[0054] The position of the solder strip 3 close to the edge of the battery sheet 1 is more likely to be peeled off, so the pad strip 4 is arranged close to the edge of the battery sheet 1 to cover the area where the solder strip 3 is relatively easy to fall off. Adjacent battery sheets 1 are arranged in sequence along the width direction X of the photovoltaic module and connected by the solder strip 3, and the pad strip 4 is also arranged close to the edge of the battery sheet 1 along the width direction X of the photovoltaic module. The edge of the pad strip 4 provided in the embodiment of the application has a certain preset distance from the edge of the photovoltaic module, that is, the pad strip 4 does not completely cover the edge area of the battery sheet 1. Because the pad strip 4 will be laminated together during lamination of the photovoltaic module, if the pad strip 4 completely covers the edge area of the battery sheet 1 or the coverage range exceeds the edge area of the battery sheet 1, part of the pad strip 4 may extend between the adjacent two battery sheets 1 during lamination, thereby causing failure of the photovoltaic module. Therefore, the scheme provided in the embodiment of the application has a certain distance between the pad strip 4 along the width direction X of the photovoltaic module and the edge of the battery sheet 1, which reduces the possibility of failure of the photovoltaic module after lamination and improves the overall stability of the photovoltaic module.

[0055] As shown in Figure 2 In a possible implementation, the size of the gap along the width direction X of the photovoltaic module is L1, and L1≤4mm. Specifically, L1 can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc., or other values in the above range, which is not limited specifically herein.

[0056] In the embodiment, if the size of the gap L1 is too large, the coverage range of the solder strip 3 close to the edge of the battery sheet 1 will be reduced, thereby the area where the solder strip 3 is easy to fall off is not reinforced, affecting the fixing effect of the pad strip 4 on the solder strip 3. If the size of the gap L1 is too small, the pad strip 4 is easy to extend between the adjacent two battery sheets 1 due to extrusion deformation during lamination of the photovoltaic module, affecting the normal work of the photovoltaic module. Moreover, if the size of the gap L1 is too small, the precision requirement for the arrangement of the pad strip 4 is high, which is not conducive to controlling the processing cost. When the width of the gap L1 provided in the embodiment of the application is 0-4mm, the fixing effect of the pad strip 4 on the solder strip 3 can be met, and the normal processing and work of the battery sheet 1 are not affected.

[0057] As shown in Figure 2As shown, in one possible embodiment, the size of the gasket 4 along the width direction X of the photovoltaic module is L2, and 10mm≤L2≤15mm. Specifically, L2 can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc., or other values ​​within the above range, and no specific restrictions are made here. The width of the gasket 4 affects the coverage of the gasket 4, that is, it affects the coverage length of the gasket 4 on the welding ribbon 3 in the width direction X of the photovoltaic module. If the coverage of the gasket 4 on the welding ribbon 3 is small, the limiting and fixing effect of the gasket 4 on the welding ribbon 3 is weak, and the welding ribbon 3 is easily separated from the battery cell 1 when subjected to external force. If the coverage area of ​​the welding ribbon 3 is too large, it will affect the light transmittance of the photovoltaic module and reduce the photoelectric conversion efficiency of the photovoltaic module. It will also increase the size of the gasket 4, resulting in a higher manufacturing cost of the gasket 4. Therefore, when the dimension L2 of the gasket 4 along the width direction X of the photovoltaic module is 10mm to 15mm, the gasket 4 can not only achieve a good fixing effect on the welding strip 3, but also minimize the obstruction of the battery cell 1, save the manufacturing cost of the gasket 4, and enable the photovoltaic module to maintain a high working efficiency.

[0058] In a possible embodiment, the dimension of the gasket strip 4 in the photovoltaic thickness direction is H1, and 50 μm ≤ H1 ≤ 150 μm. Specifically, the thickness dimension H1 of the gasket strip 4 can be 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm,

[0059] The thickness of the backing strip 4 affects its ability to secure the solder ribbon 3. If the thickness of the backing strip 4 is too thin, the adhesion between the backing strip 4 and the cell 1 will be affected, resulting in poor securing of the backing strip 4 to the solder ribbon 3. If the thickness of the backing strip 4 is too thick, the overall thickness of the photovoltaic module will be too large, which is detrimental to lightweighting the module and will result in higher costs for the backing strip 4. Therefore, in this embodiment, the thickness dimension H1 of the backing strip 4 is 50 μm to 150 μm. This ensures that the backing strip 4 can stably secure the solder ribbon 3 while also appropriately reducing the thickness of the photovoltaic module, facilitating lightweighting of the photovoltaic module and reducing the cost of the backing strip 4.

[0060] like Figure 2 As shown, in a possible embodiment, the cell 1 is provided with a welding point 5, the welding point 5 connects the cell 1 and the welding ribbon 3, and the backing strip 4 has a gap with the welding point 5 along the width direction X of the photovoltaic module.

[0061] The solder joint 5 can improve the mechanical strength of the solder strip 3 and the battery piece 1, improve the stability of the connection between the solder strip 3 and the battery piece 1, and help improve the photovoltaic module's resistance to external environmental changes caused by impact, such as wind and sand or hail on the photovoltaic module. In practice, the battery piece 1 can be provided with multiple solder joints 5, and the solder joint 5 referred to in the embodiment is the solder joint 5 closest to the edge of the battery piece 1 along the width direction X of the photovoltaic module. The pad strip 4 is arranged between the solder joint 5 and the edge of the battery piece 1. The solder joint 5 can provide good fixing function for the solder strip 3, so the area of the solder strip 3 near the solder joint 5 has a low risk of being separated from the battery piece 1, and therefore the pad strip 4 can be kept at a certain distance from the solder joint 5, and the pad strip 4 does not need to cover the solder joint 5. On the other hand, the solder joint 5 is protruded relative to the surface of the battery piece 1, and if the pad strip 4 covers the solder joint 5, the surface of the pad strip 4 can be uneven, which is not conducive to the lamination of the photovoltaic module. The pad strip 4 needs to have a larger thickness in order to cover the solder joint 5, which is not conducive to reducing the thickness and volume of the photovoltaic module. Therefore, the pad strip 4 and the solder joint 5 have a gap in the embodiment. Alternatively, the pad strip 4 can be arranged adjacent to the solder joint 5, and the side wall of the pad strip 4 can be arranged in close contact with the side wall of the solder strip 3. There can also be a certain gap between the two, as long as the projections of the two do not overlap each other in the thickness direction of the photovoltaic module. The position of the pad strip 4 is not limited herein.

[0062] In a possible implementation, the material of the pad strip 4 is thermoplastic, for example, the material of the pad strip 4 can be one of polyethylene-vinyl acetate copolymer or polyolefin elastomer.

[0063] Thermoplastic refers to plastic that has the characteristics of softening when heated and hardening when cooled. Such plastic can become soft and flow when heated, and harden after cooling. Polyethylene-vinyl acetate copolymer (EVA) is a special thermoplastic, which is made by copolymerization of ethylene and vinyl acetate. EVA has good flexibility, impact resistance, filler compatibility and heat sealing performance. Polyolefin elastomer (POE) is a special thermoplastic elastomer, which combines the elasticity of rubber and the processing convenience of thermoplastic. POE is obtained by random copolymerization of ethylene and α-olefins (such as 1-butene, 1-hexene, 1-octene, etc.), and has good mechanical properties and processing properties. The pad strip 4 is made of thermoplastic material, which is easy to shape and has good mechanical properties, and is not easy to break under external force impact, which can provide good fixing function for the solder strip 3. Moreover, EVA and POE have good weather resistance and aging resistance, which is conducive to improving the service life of the photovoltaic module. The pad strip 4 made of the above material can closely fit the solder strip 3 and the battery piece 1, and can soften and deform after heating, so as to fill the height difference between the solder strip 3 and the battery piece 1, and provide additional mechanical support after cooling, thereby enhancing the connection stability between the solder strip 3 and the battery piece 1.

[0064] In a possible implementation, the photovoltaic module includes a plurality of pads 4, the pads 4 are arranged along the width direction X of the photovoltaic module, and each pad 4 corresponds to a single fishhook structure 21.

[0065] The photovoltaic module includes a plurality of cells 1, adjacent cells 1 are connected by a solder strip 3 along the width direction X of the photovoltaic module, and the connection position of the solder strip 3 is located at the edge position of the cell 1. In this embodiment, the number and position of the solder strip 3 are arranged correspondingly. For example, one end of the solder strip 3 is connected to the front surface of one cell 1, and the other end of the solder strip 3 is connected to the back surface of another cell 1, thereby realizing the connection of the two adjacent cells 1. The pad 4 is arranged on the side of the solder strip 3 connected to the cell 1, thereby clamping the solder strip 3 between the pad 4 and the cell 1, thereby reinforcing the solder strip 3 and reducing the risk of the solder strip 3 separating from the cell 1. The pad 4 is arranged correspondingly to the single fishhook structure 21, which can improve the setting accuracy of the pad 4 covering the fishhook structure 21. The plurality of pads 4 are arranged at intervals, which can reduce the overall coverage area of the pad 4, avoid the area that does not need to be covered and reinforced being covered by the pad 4, be conducive to controlling the material cost of the pad 4, and reduce the shading of light, thereby being conducive to improving the light absorption efficiency of the photovoltaic module.

[0066] In a possible implementation, the photovoltaic module includes a plurality of cells 1, the plurality of cells 1 are arranged along the length direction Y of the photovoltaic module (not shown in the figure), the photovoltaic module includes a plurality of pads 4, and the plurality of pads 4 are arranged correspondingly to the cells 1 along the length direction Y of the photovoltaic module. Each pad 4 is used to enhance the connection strength between the cell 1 and the solder strip 3. Alternatively, the photovoltaic module can be provided with a plurality of pads 4 with a large length, and the pad 4 extends along the length direction Y, so that one pad 4 can cover a plurality of cells 1 at the same time. This arrangement can simplify the processing flow of the photovoltaic module.

[0067] In a possible implementation, one end of the solder strip 3 is connected to the front surface of the cell 1, and the other end of the solder strip 3 is connected to the back surface of another cell 1. The photovoltaic module includes a plurality of pads 4, and each pad 4 is arranged on the front surface and the back surface of the cell 1.

[0068] In the cell 1 of the photovoltaic module, one end of the welding ribbon 3 is connected to the front of the cell 1, and the other end of the welding ribbon 3 is connected to the back of the cell 1. This connection method is mainly used to achieve electrical connection between the cells 1, forming a circuit for the collection and transmission of current. Specifically, one end of the welding ribbon 3 is welded to the grid line 2 on the front of the cell 1 to collect the current generated by the front of the cell 1. The other end of the welding ribbon 3 is used for back-side string welding, that is, the other end of the welding ribbon 3 that has been connected to the front of the cell 1 is welded to the back of another cell 1, and is used to weld the grid line 2 on the front of one cell 1 to the grid line 2 on the back of the next cell. Usually, the positive electrode is located on the back of the welding ribbon 3, and the negative electrode is located on the front of the welding ribbon 3. By connecting the positive electrode of the cell 1 to the negative electrode of the next cell 1, the cell cells 1 are connected in series in sequence. In order to connect multiple cell cells 1 in series, a battery string is formed to increase the overall voltage. The pads 4 provided in the embodiment of the present application are arranged corresponding to the positions of the welding strips 3 , and are respectively arranged on the front side of the battery cell 1 and the back side of the battery cell 1 , so as to accurately achieve the reinforcement effect of the welding strips 3 .

[0069] like Figure 1 As shown, in a possible embodiment, a battery cell 1 is provided with multiple grid lines 2 , and a gasket 4 covers multiple harpoon structures 21 at the same time.

[0070] A solar cell 1 is provided with a plurality of grid lines 2, which are usually arranged in sequence along the length direction Y or the width direction X of the photovoltaic module at intervals and are distributed in a grid shape to maximize the current collection efficiency. The harpoon structure 21 is a structural design located at the end of the grid line 2 with a fork-like shape. The harpoon structure 21 can be firmly connected to the solar cell 1 and reduce the blocking area of ​​the grid line 2 on the solar cell 1, thereby improving the light absorption efficiency of the solar cell 1. The pad 4 covers the harpoon structure 21 to protect the harpoon structure 21. In addition, the connection structure between the welding ribbon 3 and the grid line 2 is located near the harpoon structure 21. The pad 4 can cover the area where the welding ribbon 3 is connected to the solar cell 1, thereby protecting the welding ribbon 3 from the influence of the external environment, and can also provide additional mechanical support to prevent the welding ribbon 3 from being displaced or damaged by external forces. The solution provided in this embodiment helps to improve the overall reliability and durability of the photovoltaic module. One of the pads 4 covers multiple harpoon structures 21 at the same time, which can reduce the process of setting the pad 4. Secondly, this setting method can increase the area of ​​a single pad 4. During lamination and processing, the pad 4 is not prone to position displacement, which facilitates the setting of the pad 4 and can reduce the overall processing difficulty of the photovoltaic module.

[0071] In a possible embodiment, the photovoltaic module includes a front glass 6, a front adhesive film 7, a back adhesive film 8 and a back glass 9 stacked in sequence, wherein the cell 1 and the gasket 4 are located between the front adhesive film 7 and the back adhesive film 8.

[0072] The front glass 6, the front adhesive film 7, the cell 1, the pad 4, the back adhesive film 8 and the back glass 9 are connected to each other by laminating to form a whole. Specifically, during the laminating, the components are laid in order and then put into a laminating machine and vacuumized and heated. After the heating, the front adhesive film 7 and the back adhesive film 8 are melted and have fluidity, so as to better bond the components to each other. After the heating is completed, cooling is performed, and finally the parts of the photovoltaic module are connected to each other to form a whole. The pad 4 is also softened during the heating, so as to be more closely connected to the cell 1 and the adhesive film, which is the front adhesive film 7 or the back adhesive film 8, to fix the solder strip 3 and improve the reliability and durability of the photovoltaic module.

[0073] The embodiment of the present application provides a photovoltaic module, which comprises a cell 1, a solder strip 3 and a pad 4. The photovoltaic module comprises at least two cells 1, each of which is provided with a grid line 2, the end of the grid line 2 has a fish-tail structure 21, the solder strip 3 is connected to the grid line 2, adjacent cells are connected by the solder strip 3, the pad 4 is arranged on the side of the solder strip 3 away from the cell 1, the pad 4 covers the whole fish-tail structure 21 and part of the solder strip 3, and the pad 4 can be bonded to the cell 1. The pad 4 is used to improve the stability of the connection between the solder strip 3 and the cell 1, so as to reduce the risk of separation of the solder strip 3 from the cell 1 and improve the reliability of the photovoltaic module.

[0074] The above embodiment shown in the drawings details the structure, features and effects of the present application. The above description is only the preferred embodiment of the present application, but the present application is not limited to the drawings shown. Any change or modification made according to the idea of the present application, or equivalent embodiment with equivalent changes, is still within the protection scope of the present application, as long as it does not exceed the spirit of the specification and drawings.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic module comprises: Welding ribbon; Solar cells, the photovoltaic module includes at least two of the solar cells, the solar cells are provided with grid lines, the ends of the grid lines have a harpoon structure, the welding strips are connected to the grid lines, and the adjacent solar cells are connected by the welding strips; A gasket is provided on a side of the welding strip away from the battery cell, and covers the entire harpoon structure and a portion of the welding strip.

2. The photovoltaic module according to claim 1, characterized in that A gap is formed between the gasket strip and the edge of the solar cell along the width direction of the photovoltaic module.

3. The photovoltaic module according to claim 2, characterized in that The dimension of the gap along the length direction of the photovoltaic module is L1, and L1 is ≤ 4 mm.

4. The photovoltaic module according to claim 1, characterized in that The dimension of the gasket along the width direction of the photovoltaic module is L2, and 10mm≤L2≤15mm.

5. The photovoltaic module according to claim 1, characterized in that The dimension of the gasket in the photovoltaic thickness direction is H1, and 50 μm≤H1≤150 μm.

6. The photovoltaic module according to claim 1, characterized in that The cell is provided with a welding point, which connects the cell and the welding strip, and a gap is formed between the gasket and the welding point along the width direction of the photovoltaic module.

7. The photovoltaic module according to claim 1, characterized in that The material of the gasket strip is one of polyethylene-polyvinyl acetate copolymer or polyolefin elastomer.

8. The photovoltaic module according to claim 1, characterized in that The photovoltaic assembly includes a plurality of the pads, which are arranged along the width direction of the photovoltaic assembly, and the pads are respectively arranged corresponding to the harpoon structures.

9. The photovoltaic module according to claim 1, characterized in that: One end of the welding ribbon is connected to the front side of the solar cell, and the other end of the welding ribbon is connected to the back side of another solar cell. The photovoltaic module includes a plurality of the pads, which are respectively arranged on the front side and the back side of the solar cell.

10. The photovoltaic module according to any one of claims 1 to 9, characterized in that: One battery cell is provided with a plurality of the grid lines, and one gasket simultaneously covers a plurality of the harpoon structures.

Images