Photovoltaic module

Abstract

The invention provides a photovoltaic module which comprises at least two battery pieces, welding strips and filler strips, the battery pieces are provided with grid lines, the ends of the grid lines are provided with fish fork structures, the welding strips are connected with the grid lines, the adjacent battery pieces are connected through the welding strips, the filler strips are arranged on the sides, away from the battery pieces, of the welding strips, and the filler strips are arranged on the side, away from the battery pieces, of the welding strips. The filler strip covers the whole fish fork structure and the part of the welding strip, can be bonded with the battery piece, and is used for improving the connection stability of the welding strip and the battery piece, thereby reducing the risk that the welding strip is separated from the battery piece, 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 cells, films, glass, and cover plates. Cells are an important component of the main components. The welding performance of 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 the long-term stability of the modules outdoors. If the reliability fails, the service life and safety performance of the modules cannot be guaranteed. In the existing packaging solution, conventional adhesive film is laid after the batteries are welded into strings, and then a complete module is formed after lamination and curing. When stringing, the welding ribbon is connected from the front of the previous battery to the back of the next battery for interconnection. There is a certain height difference between the welding wire and the battery at the interconnection point of the two pieces, and the connection between the welding wire and the battery 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 battery, resulting in poor soldering of the battery, and the EL display of the module turns 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, the photovoltaic module comprising:

[0006] Welding strips;

[0007] A cell, wherein the photovoltaic module comprises at least two cells, the cell is provided with a grid line, the end of the grid line has a harpoon structure, the welding strip is connected to the grid line, and adjacent cells are connected by the welding strip;

[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 embodiment of the present application is also provided with a pad, which is arranged on the side of the welding strip away from the battery cell, and covers the entire harpoon structure and part of the welding strip, and the pad can be bonded to the battery cell, and is used to improve the stability of the connection between the welding strip and the battery cell, thereby reducing the risk of the welding strip and the battery cell being separated, and improving the reliability of the photovoltaic module. Specifically, the pad can be set on the battery cell by adhesive bonding, so that the pad can exert pressure on the welding strip in the direction close to the battery cell, and when the welding strip is subjected to external force, such as external force in the direction of peeling the battery cell, the pressure of the pad on the welding strip can offset the external force, so that the welding strip can be stably set on the surface of the battery cell, reducing the possibility of the welding strip being separated when receiving external force, which is beneficial to improving the stability and life of the photovoltaic module.

[0010] The welding strip is set on the surface of the cell, and the welding strip is raised relative to the surface of the cell. This size difference in the thickness direction will cause the connection between the welding strip and the cell to be relatively weak, especially when the photovoltaic module is under pressure, the welding strip may fail. The pad can fill the height difference between the welding strip and the cell, and also provide additional mechanical support, which enhances the reliability and stability of the connection between the welding strip and the cell. It can reduce the thermal stress transmitted inward through the connection between the welding strip and the cell under the impact of extreme outdoor temperature environment or wind, sand, rain and snow, thereby reducing the risk of the welding strip and the cell being detached, and improving the overall reliability of the photovoltaic module. In addition, the provision of the pad helps to improve the durability of the photovoltaic module in long-term operation. By reducing the mechanical stress concentration at the connection between the welding strip and the cell, the pad helps to extend the service life of the photovoltaic module and reduce maintenance costs. In summary, the pad improves the overall reliability and durability of the photovoltaic module by filling the height difference between the welding strip and the cell and improving the stability of the connection between the welding strip and the cell.

[0011] In a possible implementation manner, a gap exists between the gasket strip and an edge of the solar cell along the width direction of the photovoltaic module.

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

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

[0014] In a possible implementation manner, a dimension of the gasket in the photovoltaic thickness direction is H1, and 50 μm≤H1≤150 μm.

[0015] In a possible implementation, the cell is provided with a welding spot, the welding spot connects the cell and the welding strip, and the cushion strip has a gap with the welding spot along the width direction of the photovoltaic module.

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

[0017] In a possible implementation, the photovoltaic assembly includes a plurality of the cushion strips, the plurality of the cushion strips are arranged along a width direction of the photovoltaic assembly, and the cushion strips are respectively arranged corresponding to the harpoon structures.

[0018] In a possible implementation, 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.

[0019] In a possible implementation manner, one battery cell is provided with a plurality of the grid lines, and one cushion strip covers a plurality of the harpoon structures at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 A structural diagram of an embodiment of the battery cell connection structure provided in this application:

[0022] Figure 2 for Figure 1 A partial enlarged view of middle Ⅰ;

[0023] Figure 3 An exploded view of an embodiment of a photovoltaic module provided in the present application.

[0024] Description of reference numerals:

[0025] 1-Battery cell;

[0026] 2-grid line;

[0027] 21- Harpoon structure;

[0028] 3-welding strip;

[0029] 4- Pad strip;

[0030] 5- Soldering points;

[0031] 6-Front glass;

[0032] 7-front adhesive film;

[0033] 8-back adhesive 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 described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0039] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" 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 other meanings.

[0040] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

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

[0042] The photovoltaic module includes at least two cells 1, the cell 1 is provided with a grid line 2, the end of the grid line 2 has a harpoon structure 21, the welding strip 3 is connected to the grid line 2, and the adjacent cells 1 are connected by the welding strip 3. The cell 1 is the core component of the photovoltaic module, which is used to convert light energy into electrical energy. The photovoltaic module increases the output power and voltage by arranging a plurality of cells 1 in series or in parallel, so as to facilitate the actual use of electrical energy. The cell 1 is provided with a plurality of grid lines 2, and the grid lines 2 can be arranged at intervals along the width direction X or the length direction Y of the photovoltaic module. The grid lines 2 are used to collect and transmit the current generated by the cell 1, wherein the grid lines 2 can include a main grid and a fine grid, and the grid lines 2 can also be all set as fine grids. There is no specific restriction on the type and quantity of the grid lines 2. The grid lines 2 are made of highly conductive materials such as silver or copper, and are formed by printing and sintering processes. A harpoon structure 21 is provided at a position of the gate line 2 near the edge of the battery cell 1. The harpoon structure 21 can reduce the transmission distance of the current in the gate line 2, thereby reducing the resistance of the battery, and can reduce the shielding area of ​​the gate line 2 on the battery cell 1, thereby improving the photoelectric conversion efficiency of the battery cell 1. In addition, the harpoon structure 21 can reduce the amount of materials used in manufacturing the gate line 2, which is beneficial to reducing the processing cost of the battery cell 1.

[0043] The photovoltaic module provided in the embodiment of the present application includes a plurality of battery cells 1, and adjacent battery cells 1 are connected by welding ribbons 3. The welding ribbons 3 are used to connect the battery cells 1 in series or in parallel to transmit current. For example, one end of the welding ribbon 3 is connected to the front side of the battery cell 1, and the other end is connected to the back side of another battery cell 1, thereby achieving interconnection.

[0044] After the photovoltaic module is processed, reliability tests such as low temperature cycle test and wet freeze test are required. At this time, the thermal stress received by the photovoltaic module will be transmitted to the inside of the photovoltaic module. As the experiment and test proceed, the stress may cause the welding strip 3 and the battery cell 1 to separate, resulting in cold welding and reliability failure, which will affect the life and efficiency of the battery cell 1. Similarly, the outdoor environment where the photovoltaic module is set may also affect the normal operation of the photovoltaic module due to similar principles. The embodiment of the present application is also provided with a pad 4, which is arranged on the side of the welding strip 3 away from the battery cell 1, and the pad 4 covers the entire harpoon structure 21 and part of the welding strip 3, and the pad 4 can be bonded to the battery cell 1. The pad 4 is used to improve the stability of the connection between the welding strip 3 and the battery cell 1, thereby reducing the risk of the welding strip 3 and the battery cell 1 being separated, and improving the reliability of the photovoltaic module. Specifically, the position where the welding strip 3 is connected to the battery cell 1 is located in the area where the harpoon structure 21 is located, and the pad 4 covers the entire harpoon structure 21, so the pad 4 can reinforce the position where the welding strip 3 is connected to the battery cell 1.

[0045] The pad 4 can be set on the cell 1 by adhesive bonding, so the pad 4 can exert pressure on the welding strip 3 in the direction close to the cell 1. When the welding strip 3 is subjected to external force, for example, when the welding strip 3 is subjected to external force in the direction of peeling off the cell 1, the pressure of the pad 4 on the welding strip 3 can offset the external force, so that the welding strip 3 can be stably set on the surface of the cell 1, reducing the possibility of the welding strip 3 being separated when subjected to external force, which is conducive to improving the stability and life of the photovoltaic module.

[0046] The welding strip 3 is arranged on the surface of the cell 1, and the welding strip 3 is raised relative to the surface of the cell 1. This size difference in the thickness direction will cause the connection between the welding strip 3 and the cell 1 to be relatively weak, especially when the photovoltaic module is under pressure, the welding strip 3 may fail. The pad 4 can fill the height difference between the welding strip 3 and the cell 1, and also provide additional mechanical support, enhance the reliability and stability of the connection between the welding strip 3 and the cell 1, and can reduce the thermal stress transmitted inward through the connection between the welding strip 3 and the cell 1 under the impact of wind, sand, rain and snow in the outdoor extreme temperature environment or wind, sand, rain and snow, thereby reducing the risk of the welding strip 3 and the cell 1 being detached, and improving the overall reliability of the photovoltaic module. In addition, the provision of the pad 4 helps to improve the durability of the photovoltaic module. By reducing the mechanical stress concentration at the connection between the welding strip 3 and the cell 1, the pad 4 helps to extend the service life of the photovoltaic module and reduce the maintenance cost. In summary, the pad 4 improves the overall reliability and durability of the photovoltaic module by filling the height difference between the welding strip 3 and the cell 1 and enhancing the stability of the connection between the welding strip 3 and the cell 1.

[0047] In addition, this embodiment does not limit the structure of the battery cell 1. The types of the battery cell 1 include but are not limited to passivated emitter rear cell (Passivated Emitter Rear Cell, PERC), oxide passivated contact cell (Tunnel Oxide Passivated Contact, TOPCon), intrinsic thin film heterojunction cell (Heterojunction with Interconnectic Thin Film, HJT), interdigitated back contact cell (Interdigitated Back Contact, IBC), perovskite cell, etc.

[0048] For PERC cells, along the thickness direction, PERC cells include front surface metal silver electrode, front surface silicon nitride passivation layer, phosphorus layer emitter, P-type base silicon layer, local aluminum back field, metal aluminum back electrode, back passivation layer (Al 2O3 / Si Nx). PERC cells use a passivation film to passivate the back, replacing the full aluminum back field, enhancing the internal back reflection of light in the silicon base, reducing the recombination rate on the back, and increasing the efficiency of the cell by 0.5%-1%.

[0049] For TOPCon cells, along the thickness direction, TOPCon cells include metal silver electrodes, front surface silicon nitride passivation layers, boron-doped emitters, N-type base silicon layers, diffused doping layers, ultra-thin silicon oxide, doped polysilicon, silicon nitride, and metal silver electrodes. The back of the cell is composed of a layer of ultra-thin silicon oxide (1nm to 2nm) and a layer of phosphorus-doped microcrystalline amorphous mixed Si film, which together form a passivation contact structure. This structure can block the recombination of minority carrier holes and increase the open circuit voltage and short circuit current of the cell. The ultra-thin oxide layer allows majority electrons to tunnel into the polysilicon layer while blocking the recombination of minority carrier holes. The good passivation effect of ultra-thin silicon oxide and heavily doped silicon film causes the energy band on the silicon wafer surface to bend, thereby forming a field passivation effect, greatly increasing the probability of electron tunneling, reducing contact resistance, and increasing the open circuit voltage and short circuit current of the cell, thereby improving the cell conversion efficiency.

[0050] For HJT cells, along the thickness direction, the HJT cells include a front low-temperature silver electrode, a front conductive film, an N-type amorphous silicon film, an intrinsic amorphous silicon film, an N-type base silicon layer, an intrinsic amorphous silicon film, a P-type amorphous silicon film, a back conductive film, and a back low-temperature silver electrode.

[0051] For I BC cells, along the thickness direction, I BC cells include silicon nitride anti-layer, N+ front surface field, N-type base silicon layer, P+ emitter, N+ back field, aluminum oxide passivation layer, silicon nitride anti-reflection layer, and metal silver electrode. I BC cells use ion implantation technology to obtain P and N regions with good uniformity and precisely controllable junction depth. There is no grid line 2 blocking on the front of the cell, which can eliminate the shading current loss of the metal electrode and realize the maximum utilization of incident photons. The short-circuit current can be increased by about 7% compared with conventional solar cells; due to the back contact structure, there is no need to consider the grid line 2 blocking problem, and the grid line 2 ratio 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 optimized to obtain a lower front surface recombination rate and surface reflection.

[0052] For perovskite cells, along the thickness direction, the perovskite cell includes substrate material, conductive film, electron transport layer (titanium dioxide), perovskite absorption layer (hole transport layer), and metal cathode. Perovskite materials have a high light absorption coefficient and a long carrier diffusion distance. After the photons absorbed by the perovskite material are converted into electrons, they are easily collected by the electrode with low loss, so they can generate higher photoelectric voltage and current, making perovskite show higher photoelectric conversion efficiency.

[0053] In a possible implementation, there is a gap between the gasket strip 4 and the edge of the solar cell 1 along the width direction X of the photovoltaic module.

[0054] The position of the welding strip 3 near the edge of the cell 1 is more likely to be peeled off, so the pad 4 is set at a position near the edge of the cell 1 to cover the area where the welding strip 3 is relatively easy to fall off. Adjacent cells 1 are arranged in sequence along the width direction X of the photovoltaic module and connected by the welding strip 3, and the pad 4 is also set at a position near the edge of the cell 1 along the width direction X of the photovoltaic module. The edge of the pad 4 provided in the embodiment of the present application has a certain preset distance from the edge of the photovoltaic module, that is, the pad 4 does not completely cover the edge area of ​​the cell 1. Because the photovoltaic module will be laminated together with the pad 4, if the pad 4 completely covers the edge area of ​​the cell 1 or the coverage range exceeds the edge area of ​​the cell 1, it may cause the pad 4 to extend between two adjacent cells 1 during lamination, thereby causing the photovoltaic module to fail. Therefore, the solution provided in the embodiment of the present application has a certain distance between the pad 4 and the edge of the cell 1 along the width direction X of the photovoltaic module, reducing the possibility of failure of the photovoltaic module after lamination and improving the overall stability of the photovoltaic module.

[0055] like Figure 2 As shown, 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 ​​within the above range, which are not specifically limited here.

[0056] In this embodiment, if the size of the gap L1 is too large, it will reduce the coverage of the edge of the welding strip 3 close to the battery cell 1, so that the area where the welding strip 3 is easy to detach is not reinforced, affecting the fixing effect of the pad 4 on the welding strip 3. If the size of the gap L1 is too small, it will cause the pad 4 to easily extend between two adjacent battery cells 1 due to extrusion deformation during the lamination of the photovoltaic module, affecting the normal operation of the photovoltaic module. Moreover, if the size of the gap L1 is too small, it will lead to high precision requirements when setting the pad 4, which is not conducive to controlling the processing cost. When the width of the gap L1 provided in the embodiment of the present application is 0 to 4 mm, it can not only meet the fixing effect of the pad 4 on the welding strip 3, but also will not affect the normal processing and operation of the battery cell 1.

[0057] like Figure 2As shown, in a possible embodiment, the size of the pad 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 pad 4 affects the coverage of the pad 4, that is, it affects the coverage length of the pad 4 on the welding strip 3 in the width direction X of the photovoltaic module. If the coverage of the pad 4 on the welding strip 3 is small, the limiting and fixing effect of the pad 4 on the welding strip 3 is weak, and the welding strip 3 is easy to separate from the battery cell 1 when receiving external force. If the coverage area of ​​the welding strip 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 pad 4, resulting in a high manufacturing cost of the pad 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, saving the manufacturing cost of the gasket 4, so that the photovoltaic module can maintain a high working efficiency.

[0058] In a possible implementation, the dimension of the cushion strip 4 in the photovoltaic thickness direction is H1, and 50 μm ≤ H1 ≤ 150 μm. Specifically, the thickness dimension H1 of the cushion 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 pad 4 affects the fixing effect of the pad 4 on the welding strip 3. If the thickness of the pad 4 is too small, it will affect the adhesion between the pad 4 and the battery cell 1, resulting in a poor fixing effect of the pad 4 on the welding strip 3. If the thickness of the pad 4 is too large, the overall thickness of the photovoltaic module will be too large, which is not conducive to the lightweight of the photovoltaic module and will result in a high cost of the pad 4. Therefore, the thickness dimension H1 of the pad 4 in this embodiment is 50μm to 150μm, which can not only enable the pad 4 to have a stable fixing effect on the welding strip 3, but also appropriately reduce the thickness of the photovoltaic module, which is conducive to achieving lightweight photovoltaic modules and reducing the cost of the pad 4.

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

[0061] The welding spot 5 can improve the mechanical strength of the connection between the welding ribbon 3 and the cell 1, improve the stability of the connection between the welding ribbon 3 and the cell 1, and help to improve the photovoltaic module to resist the impact caused by changes in the external environment, such as the physical impact of wind and sand or hail on the photovoltaic module. In practice, the cell 1 can be provided with multiple welding spots 5. The welding spot 5 referred to in this embodiment refers to the welding spot 5 closest to the edge of the cell 1 along the width direction X of the photovoltaic module, and the pad 4 is arranged between the welding spot 5 and the edge of the cell 1. The welding spot 5 can provide a good fixing function for the welding ribbon 3, so the risk of the area near the welding spot 5 of the welding ribbon 3 detaching from the cell 1 is low, so the pad 4 can keep a certain distance from the welding spot 5, and the pad 4 does not need to cover the welding spot 5. On the other hand, the welding spot 5 is raised relative to the surface of the cell 1. If the pad 4 covers the welding spot 5, the surface of the pad 4 may be uneven, which is not conducive to the lamination of the photovoltaic module. In order to cover the welding spot 5, the pad 4 also needs a larger thickness, which is not conducive to reducing the thickness and volume of the photovoltaic module, so the pad 4 and the welding spot 5 in the embodiment have a gap. Alternatively, the pad 4 can be arranged adjacent to the welding point 5, and the side wall of the pad 4 can be arranged in contact with the side wall of the welding strip 3, and there can also be a certain gap between the two. As long as the projections of the two do not overlap with each other in the thickness direction of the photovoltaic module, there is no restriction on the setting position of the pad 4.

[0062] In a possible implementation, the material of the cushion strip 4 is thermoplastic plastic, for example, the material of the cushion strip 4 may be a material selected from polyethylene-polyvinyl acetate copolymer or polyolefin elastomer.

[0063] Thermoplastic refers to a plastic with the characteristics of softening by heating and hardening by cooling. This plastic can soften and flow when heated, and harden after cooling. Polyethylene-vinyl acetate copolymer (EVA) is a special thermoplastic, which is obtained 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 thermoplastics. 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 4 is made of thermoplastic material for easy molding, and has good mechanical properties. It is not easy to break when impacted by external force, and can play a good fixing role on the welding strip 3. Both EVA and POE can have good weather resistance and aging resistance, which is conducive to improving the service life of photovoltaic modules. The pad 4 is made of the above-mentioned material so that it can fit tightly between the soldering ribbon 3 and the battery cell 1, soften and deform after heating, and is used to fill the height difference between the soldering ribbon 3 and the battery cell 1, and provides additional mechanical support after cooling, thereby enhancing the connection stability between the soldering ribbon 3 and the battery cell 1.

[0064] In a possible implementation, the photovoltaic assembly includes a plurality of gaskets 4 , which are arranged along the width direction X of the photovoltaic assembly, and the gaskets 4 are respectively arranged corresponding to a single harpoon structure 21 .

[0065] The photovoltaic module includes a plurality of cells 1, and adjacent cells 1 are connected by welding strips 3 along the width direction X of the photovoltaic module, and the connection position of the welding strips 3 is located at the edge of the cell 1. The number and position of the welding strips 3 provided in this embodiment are set corresponding to the number and position of the welding strips 3. For example, one end of the welding strip 3 is connected to the front of a cell 1, and the other end of the welding strip 3 is connected to the back of another cell 1, so as to achieve the connection between two adjacent cells 1, and the pad 4 is correspondingly arranged on the side where the welding strip 3 is connected to the cell 1, so that the welding strip 3 is clamped between the pad 4 and the cell 1, thereby reinforcing the welding strip 3 and reducing the risk of the welding strip 3 being separated from the cell 1. The pad 4 is respectively arranged corresponding to a single harpoon structure 21, which can improve the setting accuracy of the pad 4 covering the harpoon structure 21, and the plurality of pads 4 are respectively 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 from being covered by the pad 4, which is conducive to controlling the material cost of the pad 4, and can reduce the shielding of light, which is 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, and the plurality of cells 1 are arranged along the length direction Y of the photovoltaic module (not shown in the figure), and the optical module includes a plurality of gaskets 4, and the plurality of gaskets 4 are arranged along the length direction Y of the photovoltaic module corresponding to the cells 1, and each gasket 4 is used to enhance the connection strength between the cell 1 and the welding strip 3 where the gasket 4 is arranged. Alternatively, the photovoltaic module can be provided with a plurality of gaskets 4 of a relatively large length, and the gaskets 4 extend along the length direction Y, so that one gasket 4 can cover a plurality of cells 1 at the same time, and such an arrangement can simplify the processing flow of the photovoltaic module.

[0067] In a possible embodiment, one end of the welding ribbon 3 is connected to the front side of the battery cell 1, and the other end of the welding ribbon 3 is connected to the back side of another battery cell 1. The photovoltaic module includes a plurality of pads 4, which are respectively arranged on the front and back sides of the battery 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 to achieve electrical connection between the cells 1 to form 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 series 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 cells 1 are connected in series in sequence. In order to connect multiple cells 1 in series, a battery string is formed to increase the overall voltage. The pad strip 4 provided in the embodiment of the present application is arranged corresponding to the position of the welding strip 3, and is 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 strip 3.

[0069] like Figure 1 As shown, in a possible implementation, a battery cell 1 is provided with a plurality of grid lines 2 , and a cushion strip 4 covers a plurality of harpoon structures 21 at the same time.

[0070] A battery 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, 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 and having a shape similar to a fork shape. The harpoon structure 21 can be firmly connected to the battery cell 1, and reduce the shielding area of ​​the grid line 2 on the battery cell 1, thereby improving the light absorption efficiency of the battery cell 1. The pad 4 covers the harpoon structure 21 to protect the harpoon structure 21. In addition, the connection structure between the welding strip 3 and the grid line 2 is located near the harpoon structure 21, and the pad 4 can cover the area where the welding strip 3 is connected to the battery cell 1, so that the welding strip 3 can be protected from the influence of the external environment, and additional mechanical support can be provided to prevent the welding strip 3 from being displaced or damaged due to external force. 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 pads 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 implementation, 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 battery cell 1, the cushion strip 4, the back adhesive film 8 and the back glass 9 are interconnected by lamination to form a whole. Specifically, during lamination, the components are laid out in order, and then put into the laminator and vacuumed and heated. After heating, the front adhesive film 7 and the back adhesive film 8 will melt and have fluidity, so as to better bond the components together. After the heating is completed, it is cooled, and finally the various parts of the photovoltaic module are interconnected to form a whole. The cushion strip 4 will also soften during the heating process, so that it is more closely connected with the battery cell 1 and the adhesive film, wherein the adhesive film refers to the front adhesive film 7 or the back adhesive film 8 to achieve the fixing effect on the welding strip 3, thereby improving the reliability and durability of the photovoltaic module.

[0073] An embodiment of the present application provides a photovoltaic module, which includes a battery cell 1, a welding strip 3 and a gasket 4. The photovoltaic module includes at least two battery cells 1. The battery cell 1 is provided with a grid line 2, and the end of the grid line 2 has a harpoon structure 21. The welding strip 3 is connected to the grid line 2, and adjacent battery cells are connected through the welding strip 3. The gasket 4 is arranged on the side of the welding strip 3 away from the battery cell 1, and the gasket 4 covers the entire harpoon structure 21 and a part of the welding strip 3, and the gasket 4 can be bonded to the battery cell 1. The gasket 4 is used to improve the stability of the connection between the welding strip 3 and the battery cell 1, thereby reducing the risk of separation between the welding strip 3 and the battery cell 1, and improving the reliability of the photovoltaic module.

[0074] The above describes in detail the structure, features and effects of the present application based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present application, but the present application does not limit the scope of implementation to what is shown in the drawings. Any changes made in accordance with the concept of the present application, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present application.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic module comprises: Welding strips; A cell, wherein the photovoltaic module comprises at least two cells, the cell is provided with a grid line, the end of the grid line has a harpoon structure, the welding strip is connected to the grid line, and adjacent cells are connected by the welding strip; 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: The gasket has a gap with 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 component is L1, and L1≤4mm.

4. The photovoltaic module according to claim 1, characterized in that: The dimension of the cushion strip 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 battery cell is provided with a welding spot, the welding spot connects the battery cell and the welding strip, and the cushion strip has a gap with the welding spot along the width direction of the photovoltaic module.

7. The photovoltaic module according to claim 1, characterized in that: The material of the cushion 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 strip is connected to the front side of the solar cell, and the other end of the welding strip 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 cushion strip covers a plurality of the harpoon structures at the same time.

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