Photovoltaic module and manufacturing method thereof

Abstract

The invention relates to a photovoltaic module and a manufacturing method thereof, and the photovoltaic module comprises a battery string which is arranged at one side of a glass front plate, the battery string comprises a plurality of battery pieces which are sequentially arranged in a preset direction, the battery pieces are sequentially connected through welding strips, the first surfaces of the battery pieces face the glass front plate, and the second surfaces of the battery pieces deviate from the glass front plate; the first coating layer is laid on the side, away from the glass front plate, of the battery string, and the first coating layer is in direct contact with the second face of the battery piece so as to fix the battery piece and the welding strip located on the second face of the battery piece; the pre-crosslinking degree of one side, close to the battery piece, of the first film coating layer is 30%-50%; and the packaging adhesive film surrounds the circumferential edge of the battery string, and the packaging adhesive film is obtained by sequentially splicing a plurality of adhesive tapes. The problems of glue permeation, pseudo soldering and the like in the low-temperature film-coated assembly can be effectively solved, the photoelectric conversion efficiency and long-term stability of the photovoltaic assembly can be improved, the production cost of the photovoltaic assembly is reduced, and the market competitiveness of the photovoltaic assembly can be improved.

Description

Technical Field

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

[0002] Low-temperature film-coated components refer to components made by connecting solar cells in series by directly crimping soldering tapes to the front and back sides of solar cells with adhesive film in one go during photovoltaic module production. They have the advantages of reducing costs, increasing efficiency, improving battery performance and broadening the scope of application.

[0003] However, low-temperature film-coated components still face the problems of easy solder joints and high material costs, which limit the application scope of low-temperature film-coated components. Summary of the invention

[0004] Based on this, it is necessary to provide a photovoltaic component and a method for manufacturing the same to address the problems of easy solder joint failure and high material cost of low-temperature film-coated components in the prior art.

[0005] In a first aspect, the present disclosure provides a photovoltaic assembly, comprising:

[0006] A battery string is arranged on one side of the glass front plate, the battery string comprises a plurality of battery cells arranged in sequence along a preset direction, the battery cells are sequentially connected by welding strips, a first surface of the battery cell faces the glass front plate, and a second surface of the battery cell faces away from the glass front plate;

[0007] A first coating layer is laid on the side of the battery string away from the glass front plate, and the first coating layer is in direct contact with the second side of the battery cell to fix the battery cell and the welding strip located on the second side of the battery cell; the pre-crosslinking degree of the first coating layer on the side close to the battery cell is 30%-50%;

[0008] The packaging film surrounds the circumferential edge of the battery string, and the packaging film is obtained by sequentially splicing a plurality of adhesive strips.

[0009] Optionally, the pre-crosslinking degree of the first coating layer on the side close to the battery cell is greater than the pre-crosslinking degree of the first coating layer on the side away from the battery cell, and the fluidity of the first coating layer on the side close to the battery cell is less than the fluidity of the first coating layer on the side away from the battery cell;

[0010] The pre-crosslinking degree of the first coating layer on the side away from the battery cell is 0%-10%.

[0011] Optionally, the first coating layer includes multiple layers of sub-adhesive film layers stacked in sequence on the battery cell; along the direction away from the battery cell, the pre-crosslinking degree of the multiple layers of the sub-adhesive film layers gradually increases; and along the direction away from the battery cell, the difference in the pre-crosslinking degree of two adjacent layers of the sub-adhesive film layers is the same.

[0012] Optionally, a first welding strip and a second welding strip are laid on the second surface of each of the battery cells, and the battery cell is connected to an adjacent battery cell through the first welding strip and is connected to another adjacent battery cell through the second welding strip;

[0013] The first covering layer is entirely laid on a side of the battery string away from the glass front plate, and the first covering layer covers the second side of each battery cell and the first welding strip and the second welding strip located on the second side of the battery cell;

[0014] A first adhesive film layer is laid between the battery string and the glass front plate, and the battery string is connected to the glass front plate through the first adhesive film layer.

[0015] Optionally, the welding strip includes a first connecting portion and a second connecting portion connected to each other, and along the preset direction, the first connecting portion is connected to the second surface of one of the battery cells, and the second connecting portion is connected to the first surface of the next battery cell arranged in sequence;

[0016] A piece of the first covering layer is laid on the second surface of each of the battery cells, and the first covering layer fixes the battery cell and the first connecting portion located on the second surface of the battery cell;

[0017] A second coating layer is also laid on the first surface of each battery cell, and the second coating layer fixes the battery cell and the second connecting portion located on the first surface of the battery cell. The pre-crosslinking degree of the second coating layer on the side close to the battery cell is 30%-50%; the battery string is connected to the glass front panel through the second coating layer.

[0018] Optionally, the first coating layer is the same as the second coating layer.

[0019] In a second aspect, the present disclosure provides a method for manufacturing a photovoltaic module, comprising:

[0020] Arrange a plurality of battery cells in sequence along a preset direction, lay welding strips on the second surface of the battery cells along the preset direction, the welding strips include a first welding strip and a second welding strip, the battery cell is connected to an adjacent battery cell through the first welding strip, and is connected to another adjacent battery cell through the second welding strip, so as to obtain a battery string;

[0021] Laying a whole first coating layer on the battery string, the first coating layer directly contacts the second surface of each battery cell to fix the battery cell to the first welding strip and the second welding strip located on the second surface of the battery cell; the pre-crosslinking degree of the first coating layer on the side close to the battery cell is 30%-50%;

[0022] Laying a first adhesive film layer on the glass front plate, with the first surface of the battery sheet facing the glass front plate, the second surface of the battery sheet facing away from the glass front plate, and placing the battery string on the first adhesive film layer;

[0023] A packaging film is arranged on the outer periphery of the battery string, the packaging film surrounds the circumferential edge of the battery string, and the packaging film is obtained by sequentially splicing a plurality of adhesive strips.

[0024] Optionally, the pre-crosslinking degree of the first coating layer on the side close to the battery cell is greater than the pre-crosslinking degree of the first coating layer on the side away from the battery cell, and the fluidity of the first coating layer on the side close to the battery cell is less than the fluidity of the first coating layer on the side away from the battery cell;

[0025] The pre-crosslinking degree of the first coating layer on the side away from the battery cell is 0%-10%.

[0026] In a third aspect, the present disclosure provides a method for manufacturing a photovoltaic module, comprising:

[0027] Providing a plurality of battery cells and a plurality of welding strips, wherein the welding strips include a first connecting portion and a second connecting portion connected to each other;

[0028] Place a battery cell, place a welding strip on the battery cell, place the first connection portion of the welding strip on the second surface of the battery cell, lay a first coating layer on the second surface of the battery cell, the first coating layer is in direct contact with the second surface of the battery cell, so as to fix the battery cell and the first connection portion of the welding strip on the second surface of the battery cell, wherein the pre-crosslinking degree of the first coating layer on the side close to the battery cell is 30%-50%; then place another battery cell on the second connection portion of the welding strip;

[0029] Repeat the steps of placing a welding ribbon on the battery cell, placing another battery cell on the second connecting portion, and laying a first coating layer on the back of the battery cell to manufacture a battery string; the multiple battery cells of the battery string are arranged in sequence along a preset direction, along the preset direction, the first connecting portion is connected to the second surface of one of the battery cells, and the second connecting portion is connected to the first surface of the next battery cell arranged in sequence;

[0030] Turning over the battery string, laying a second coating layer on the first surface of each battery cell in the battery string, the second coating layer directly contacts the first surface of the battery cell, the second coating layer fixes the battery cell and the second connecting portion located on the first surface of the battery cell, and the pre-crosslinking degree of the second coating layer on the side close to the battery cell is 30%-50%;

[0031] With the first surface of the battery sheet facing the glass front plate and the second surface of the battery sheet facing away from the glass front plate, the battery string is placed on the glass front plate;

[0032] A packaging film is arranged on the outer periphery of the battery string, the packaging film surrounds the circumferential edge of the battery string, and the packaging film is obtained by sequentially splicing a plurality of adhesive strips.

[0033] Optionally, the pre-crosslinking degree of the first coating layer on the side close to the battery cell is greater than the pre-crosslinking degree of the first coating layer on the side away from the battery cell, and the fluidity of the first coating layer on the side close to the battery cell is less than the fluidity of the first coating layer on the side away from the battery cell;

[0034] The pre-crosslinking degree of the first coating layer on the side away from the battery cell is 0%-10%.

[0035] The photovoltaic module and its manufacturing method of the present application only lay a first coating layer on the side of the battery string away from the glass front plate, and adjust the pre-crosslinking degree of the first coating layer on the side close to the battery cell to 30%-50%, thereby optimizing the lamination effect of the first coating layer, and can effectively solve the problems of glue seepage, cold soldering and so on in the low-temperature coating module, which is beneficial to improving the photoelectric conversion efficiency and long-term stability of the photovoltaic module; at the same time, the photovoltaic module of this embodiment reduces the number of film layers on the back side of the battery string, reduces the production cost of the photovoltaic module, and can improve the market competitiveness of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are 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 creative work.

[0037] Figure 1 is a top view of a photovoltaic assembly provided in one embodiment;

[0038] Figure 2 is a cross-sectional schematic diagram of a photovoltaic module provided in an embodiment;

[0039] Figure 3is a schematic diagram of a battery string provided in an embodiment;

[0040] Figure 4 A schematic diagram of a battery string provided in another embodiment;

[0041] Figure 5 A schematic diagram of a battery cell provided in an embodiment being connected via a first welding ribbon and a second welding ribbon;

[0042] Figure 6 is a cross-sectional schematic diagram of a photovoltaic module provided in yet another embodiment;

[0043] Figure 7 is a schematic diagram of a battery string provided in yet another embodiment;

[0044] Figure 8 is a cross-sectional schematic diagram of a photovoltaic module provided in yet another embodiment;

[0045] Fig. 9 is a schematic diagram of a battery string provided in yet another embodiment;

[0046] Fig.10 is a schematic cross-sectional view of a photovoltaic module provided in another embodiment;

[0047] Fig.11 A schematic diagram of a battery string provided in another embodiment;

[0048] Fig.12 is a process flow chart of a method for manufacturing a photovoltaic module provided in an embodiment;

[0049] Fig.13 It is a process flow chart of a method for manufacturing a photovoltaic module provided in another embodiment.

[0050] Description of reference numerals:

[0051] 11. Glass front panel; 12. Battery string; 13. First coating layer; 14. Encapsulation film; 15. First film layer; 16. Second coating layer; 17. Glass back panel; 10. Battery cell; 20. Welding strip; 120. First welding strip; 220. Second welding strip; 21. First connecting part; 22. Second connecting part. DETAILED DESCRIPTION

[0052] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0054] In the related art, the low-temperature film-coated assembly is made of photovoltaic glass-positive adhesive film-cell-back adhesive film-coating adhesive layer-glass / backboard high-temperature lamination. Among them, the adhesive film materials of the positive adhesive film and the back adhesive film are mainly ethylene-polyvinyl acetate (EVA), polyolefin (POE), cross-linked polyolefin (PO), thermoplastic polyurethane (TPU), polyvinyl butyral (PVB), silane-grafted ethylene copolymer, ethylene-methacrylic acid ion polymer and other matrix resin materials. However, when the low-temperature film-coated assembly is coated with the battery string, the lamination temperature may not be high enough, resulting in the film not being fully softened, which is prone to glue penetration, which may cause glue penetration of the back adhesive film and lead to EL cold soldering. Cold soldering will cause the solder strip on the cell to fail to be welded to the grid line, so that a small piece of the cell cannot contact the conduction and cause a short circuit. Cold soldering will also reduce the photoelectric conversion efficiency of the photovoltaic module and affect the current collection. In addition, under long-term operation, cold soldering may cause hot spot effect, which in turn affects the performance of the photovoltaic module and even causes the module to burn out and be scrapped.

[0055] Among them, EL solder joints refer to the phenomenon of solder joints being found to be cold when using the principle of electroluminescence (EL) for detection. In addition, the adhesive film material of low-temperature film components is consumable and expensive.

[0056] According to an exemplary embodiment, the present disclosure provides a photovoltaic assembly 1, such as Figure 1-Figure 7 As shown, the photovoltaic module 1 includes a battery string 12, a first coating layer 13 and a packaging film 14; the photovoltaic module 1 is arranged on one side of the glass front plate 11, the battery string 12 includes a plurality of battery cells 10 arranged in sequence along a preset direction X, the battery cells 10 are connected in sequence through welding strips 20, the first surface 10a of the battery cell 10 faces the glass front plate 11, and the second surface 10b of the battery cell 10 faces away from the glass front plate 11; the first coating layer 13 is laid on the side of the battery string 12 away from the glass front plate 11, and the first coating layer 13 and the battery cell 10 are connected in sequence. The second surface 10b is in direct contact with the battery cell 10 to fix the welding strip 20 located on the second surface 10b of the battery cell 10; the pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 is 30%-50%. For example, the pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 can be 30%, 33%, 35%, 38%, 40%, 43%, 45%, 47%, 49% or 50%; the packaging film 14 surrounds the circumferential edge of the battery string 12, and the packaging film 14 is obtained by splicing a plurality of adhesive strips in sequence.

[0057] If the pre-crosslinking degree of the first coating layer 13 is too high, the coating layer may be too rigid, which is not conducive to the bonding with the battery cell 10; if the pre-crosslinking degree is too low, the glue seepage cannot be effectively suppressed. In this embodiment, the pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 is adjusted to 30%-50%. The pre-crosslinking degree of 30%-50% can maintain the stability of the first coating layer 13 under low temperature conditions and reduce the risk of glue seepage.

[0058] The first coating layer 13 can be made of ethylene-polyvinyl acetate (EVA), polyolefin (POE) or high-performance thermoplastic polyurethane (TPU), thermoplastic polyolefin (TPO) with high heat resistance and low adhesive permeability, so that the first coating layer 13 can maintain flexibility and better adapt to low-temperature lamination conditions.

[0059] The packaging film 14 surrounds the circumferential edge of the battery string 12, and is used to protect the battery string 12 and improve its structural stability. The packaging film 14 is obtained by splicing a plurality of adhesive strips in sequence, so that the flexibility and accuracy of the packaging process can be improved, and each adhesive strip is ensured to be tightly and seamlessly spliced ​​to prevent moisture and oxygen from penetrating.

[0060] The packaging film 14 can be made of ethylene-polyvinyl acetate (EVA) or polyolefin (POE) film.

[0061] The photovoltaic module 1 of this embodiment has only one first coating layer 13 laid on the side of the battery string 12 away from the glass front plate 11, and the pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 is adjusted to 30%-50%, thereby optimizing the lamination effect of the first coating layer 13, effectively solving the problems of glue seepage and cold solder joints in low-temperature coating modules, and being beneficial to improving the photoelectric conversion efficiency and long-term stability of the photovoltaic module 1; at the same time, the photovoltaic module 1 of this embodiment reduces the number of adhesive film layers on the back side of the battery string 12, reduces the production cost of the photovoltaic module 1, and can improve the market competitiveness of the photovoltaic module 1.

[0062] Among them, the types of the cell 10 in the embodiment of the present application include but are not limited to Passivated Emitter Rear Cell (PERC), Tunnel Oxide Passivated Contact (TOPCON), Heterojunction with Intrinsic Thin-layer (HIT), Back Contact (BC), Perovskite Solar Cells (PSC), etc. In this embodiment, the type of the cell 10 in the photovoltaic module 1 is not specifically limited.

[0063] For BC cells, the emitter, surface field and metal electrode are all set on the back of the cell and cross-distributed. The front of the cell 10 uses SiN x / SiO x The double-layer anti-reflection passivation film makes the front of the battery free from metal electrode shielding, so that the battery cell 10 can receive more incident light, reduce optical loss, and improve photoelectric conversion efficiency.

[0064] 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 an ultra-thin silicon oxide layer (1nm~2nm) and a 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, and reducing the contact resistance, which increases the open circuit voltage and short circuit current of the cell, thereby improving the cell conversion efficiency.

[0065] For HIT batteries, along their thickness direction, the HIT batteries 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.

[0066] For PERC cells, along the 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, a back passivation layer (Al2O3 / SiN x ). PERC cells use a passivation film to passivate the back side, replacing the all-aluminum back side field, enhancing the internal back reflection of light in the silicon substrate, reducing the recombination rate on the back side, and increasing the efficiency of the cell by 0.5%-1%.

[0067] For PSC 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 the perovskite show a higher photoelectric conversion efficiency.

[0068] In some embodiments, Figure 1-Figure 7 As shown, the pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 is greater than the pre-crosslinking degree of the first coating layer 13 on the side away from the battery cell 10, and the fluidity of the first coating layer 13 on the side close to the battery cell 10 is less than the fluidity of the first coating layer 13 on the side away from the battery cell 10.

[0069] As such, in the photovoltaic module 1 of this embodiment, the side of the first coating layer 13 close to the battery cell 10 has a higher degree of pre-crosslinking, and the side of the first coating layer 13 close to the battery cell 10 has lower fluidity. When the photovoltaic module 1 is laminated, the side of the first coating layer 13 close to the battery cell 10 can better maintain shape and position stability, thereby ensuring a close fit between the first coating layer 13 and the battery cell 10 and preventing misalignment or cold solder joints caused by material flow; the side of the first coating layer 13 away from the battery cell 10 has a lower degree of pre-crosslinking and higher fluidity, so that the first coating layer 13 can adapt to the shape and unevenness of the battery string 12, and also help to release the internal stress of the battery string 12 during the lamination process to avoid the generation of bubbles or wrinkles, which is beneficial to improving the structural stability and durability of the photovoltaic module 1.

[0070] In some embodiments, the pre-crosslinking degree of the first coating layer 13 on the side away from the battery cell 10 is 0%-10%. For example, the pre-crosslinking degree of the first coating layer 13 on the side away from the battery cell 10 can be 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%.

[0071] In one example, the pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 is 30%, and the pre-crosslinking degree of the first coating layer 13 on the side away from the battery cell 10 is 0; in another embodiment, the pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 is 35%, and the pre-crosslinking degree of the first coating layer 13 on the side away from the battery cell 10 is 2%; in another example, the pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 is 40%, and the pre-crosslinking degree of the first coating layer 13 on the side away from the battery cell 10 is 5%; in the fourth example, the pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 is 45%, and the pre-crosslinking degree of the first coating layer 13 on the side away from the battery cell 10 is 7%. In the fifth example, the pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 is 50%, and the pre-crosslinking degree of the first coating layer 13 on the side away from the battery cell 10 is 10%.

[0072] In some embodiments, the first coating layer 13 includes multiple layers of sub-adhesive film layers stacked in sequence on the battery cell 10; the pre-crosslinking degree of the multiple layers of sub-adhesive film layers gradually increases in the direction away from the battery cell 10; and the difference in the pre-crosslinking degree of two adjacent layers of sub-adhesive film layers is the same in the direction away from the battery cell 10.

[0073] In this embodiment, the first coating layer 13 includes at least two sub-glue film layers stacked on the battery cell 10. For example, the first coating layer 13 may include two, three, four, five or more sub-glue film layers.

[0074] For example, refer to Figure 4 As shown, the first coating layer 13 includes a first sub-film layer 131, a second sub-film layer 132, and a third sub-film layer 133 stacked on the battery cell 10. In one example, the pre-crosslinking degree of the first sub-film layer 131 is 30%, the pre-crosslinking degree of the second sub-film layer 132 is 15%, and the pre-crosslinking degree of the third sub-film layer 133 is 0%; in another example, the pre-crosslinking degree of the first sub-film layer 131 is 50%, the pre-crosslinking degree of the second sub-film layer 132 is 30%, and the pre-crosslinking degree of the third sub-film layer 133 is 10%.

[0075] In some other embodiments, the first coating layer 13 may be a single-layer structure, and the first coating layer 13 is an adhesive film layer with a pre-crosslinking degree of 30%-50%.

[0076] In some embodiments, reference Figure 2-Figure 5 The battery cell 10 in this embodiment is a BC battery without a main grid. The second surface 10b of the battery cell 10 is the back surface of the battery cell 10, and the second surface 10b of the battery cell 10 is alternately provided with positive electrode fine grids and negative electrode fine grids.

[0077] The second side 10b of each battery cell 10 is paved with a first welding ribbon 120 and a second welding ribbon 220. The battery cell 10 is connected to an adjacent battery cell 10 through the first welding ribbon 120 and to another adjacent battery cell 10 through the second welding ribbon 220. The first welding ribbon 120 connects the positive electrode fine grid of the current battery cell 10 to the negative electrode fine grid (or the positive electrode fine grid, depending on the series connection sequence) of the adjacent battery cell 10; the second welding ribbon 220 connects the negative electrode fine grid of the current battery cell 10 to the adjacent battery cell 10. 0 is connected to the positive electrode fine grid (or negative electrode fine grid) to connect the battery cells 10 of the entire battery string 12 in series; the first covering layer 13 is laid on the side of the battery string 12 away from the glass front plate 11, and the first covering layer 13 covers the second side 10b of each battery cell 10 and the first welding strip 120 and the second welding strip 220 located on the second side 10b of the battery cell 10; a first adhesive film layer 15 is laid between the battery string 12 and the glass front plate 11, and the battery string 12 is connected to the glass front plate 11 through the first adhesive film layer 15.

[0078] The first coating layer 13 is laid in its entirety on the side of the battery string 12 facing away from the glass front plate 11 (i.e., the back side of the battery cell 10), covering the second side 10b of each battery cell 10 and the first welding strip 120 and the second welding strip 220 located thereon. The first coating layer 13 not only fixes the first welding strip 120 and the second welding strip 220 of the battery cell 10 and its second side 10b, but also enables the first welding strip 120 to be alloyed and connected with the negative electrode fine grid (or positive electrode fine grid) of the battery cell 10, and the second welding strip 220 to be alloyed and connected with the positive electrode fine grid (or negative electrode fine grid) of the battery cell 10 after lamination of the photovoltaic module 1.

[0079] The pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 is 30%-50%, which optimizes the lamination effect of the first coating layer 13, can effectively solve the problems of glue seepage and cold welding in the low-temperature coating assembly, reduce the production cost of the photovoltaic assembly 1, and can improve the market competitiveness of the photovoltaic assembly 1.

[0080] The side of the battery string 12 close to the glass front plate 11 is connected to the glass front plate 11 through the first adhesive film layer 15. For example, the first adhesive film layer 15 can be made of ethylene-polyvinyl acetate (EVA), polyolefin (POE), cross-linked polyolefin (PO), thermoplastic polyurethane (TPU), polyvinyl butyral (PVB), silane grafted ethylene copolymer, ethylene-methacrylic acid ion polymer and other adhesive films.

[0081] In this embodiment, the packaging film 14 is arranged on the side of the first film layer 15 away from the glass front plate 11, and the packaging film 14 covers the circumferential edge of the battery string 12 and the circumferential edge of the first coating layer 13 to avoid overflow of glue at the edge of the first coating layer 13 during the lamination process, and to avoid misalignment or cold soldering problems caused by material flow of the first coating layer 13.

[0082] In this embodiment, the photovoltaic module 1 further includes a glass back plate 17 , and the glass back plate 17 is disposed on a side of the first coating layer 13 away from the battery string 12 .

[0083] In some embodiments, reference Figure 6 , Figure 7 The cell 10 in this embodiment is a TOPCon cell without a main grid. The first surface 10a of the cell 10 is the front surface, and the first surface 10a is provided with a positive electrode fine grid, and the second surface 10b of the cell 10 is the back surface, and the second surface 10b is provided with a negative electrode fine grid.

[0084] The welding strip 20 includes a first connecting portion 21 and a second connecting portion 22 connected to each other. Along the preset direction X, the first connecting portion 21 is connected to the second surface 10b of a battery cell 10, and the second connecting portion 22 is connected to the first surface 10a of the next battery cell 10 arranged in sequence. The welding strip 20 connects the positive electrode fine grid of the current battery cell 10 with the negative electrode fine grid (or the positive electrode fine grid, depending on the series connection sequence) of the adjacent battery cell 10; a first covering layer 13 is laid on the second surface 10b of each battery cell 10, and the first covering layer 13 fixes the battery cell 10 and the first connecting portion 21 located on the second surface 10b of the battery cell 10 ; A second coating layer 16 is also laid on the first surface 10a of each battery cell 10, and the second coating layer 16 fixes the battery cell 10 and the second connecting portion 22 located on the first surface 10a of the battery cell 10. The pre-crosslinking degree of the second coating layer 16 on the side close to the battery cell 10 is 30%-50%. For example, the pre-crosslinking degree of the second coating layer 16 on the side close to the battery cell 10 can be 30%, 33%, 35%, 38%, 40%, 43%, 45%, 47%, 49% or 50%; the battery string 12 is arranged on the glass front plate 11 and is connected to the glass front plate 11 through the second coating layer 16.

[0085] In this way, the first coating layer 13 is laid on the second side 10b of each battery cell 10 to fix the first connecting portion 21 of the battery cell 10 and the welding tape 20, and the second coating layer 16 is laid on the first side 10a of each battery cell 10 to fix the second connecting portion 22 of the battery cell 10 and the welding tape 20. The first coating layer 13 and the second coating layer 16 have a high degree of cross-linking on the side close to the battery cell 10, which can maintain the stability of the first coating layer 13 and the second coating layer 16 under low temperature conditions and reduce the risk of glue seepage; at the same time, there is only one coating layer on the front and back sides of the battery cell 10, which reduces the production cost of the photovoltaic module 1 and can improve the market competitiveness of the photovoltaic module 1.

[0086] In some embodiments, the first coating layer 13 is the same as the second coating layer 16 .

[0087] For example, the pre-crosslinking degree of the second coating layer 16 on the side close to the battery cell 10 is greater than the pre-crosslinking degree of the second coating layer 16 on the side away from the battery cell 10, and the fluidity of the second coating layer 16 on the side close to the battery cell 10 is less than the fluidity of the second coating layer 16 on the side away from the battery cell 10.

[0088] For example, the pre-crosslinking degree of the second coating layer 16 on the side away from the battery cell 10 is 0%-10%. For example, the pre-crosslinking degree of the second coating layer 16 on the side away from the battery cell 10 can be 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%.

[0089] For example, the second coating layer 16 includes multiple layers of sub-adhesive film layers stacked in sequence on the battery cell 10; the pre-crosslinking degree of the multiple layers of sub-adhesive film layers gradually increases in the direction away from the battery cell 10; and the difference in the pre-crosslinking degree of two adjacent layers of sub-adhesive film layers is the same in the direction away from the battery cell 10.

[0090] In this embodiment, the packaging film 14 is arranged on the glass front plate 11, and the packaging film 14 covers the circumferential edge of the battery string 12, the edge of the circumferential first coating layer 13 of the battery string 12, and the edge of the circumferential second coating layer 16 of the battery string 12, so as to avoid misalignment or cold soldering problems caused by overflow of the edges of the first coating layer 13 and the second coating layer 16 during the lamination process.

[0091] In some embodiments, Figure 8 , Fig. 9 As shown, the entire second coating layer 16 is laid between the battery string 12 and the glass front plate 11, and the second coating layer 16 covers the first surface 10a of each battery cell 10 and the second connecting portion 22 located on the first surface 10a of the battery cell 10. In this way, the step of laying the second coating layer 16 only needs to be performed once to fix the second connecting portion 22 of the first surface 10a of each battery cell 10. The manufacturing process is simpler, which can effectively save manufacturing time and improve processing efficiency.

[0092] In some embodiments, Fig.10 , Fig.11 As shown, a second coating layer 16 is laid on the first surface 10a of each battery cell 10, and a whole layer of the first coating layer 13 is laid on the second surface 10b of multiple battery cells 10. In this way, the step of laying the first coating layer 13 only needs to be performed once to fix the first connecting portion 21 of the second surface 10b of each battery cell 10.

[0093] In this embodiment, the photovoltaic module 1 further includes a glass back plate 17 , and the glass back plate 17 is disposed on a side of the first coating layer 13 away from the battery string 12 .

[0094] According to an exemplary embodiment, the present disclosure provides a method for manufacturing a photovoltaic module, such as Fig.12 As shown, the method for manufacturing a photovoltaic module of this embodiment includes:

[0095] Step S101: Arrange multiple battery cells 10 in sequence along a preset direction X, lay a welding ribbon 20 on the second surface 10b of the battery cell 10 along the preset direction X, the welding ribbon 20 includes a first welding ribbon 120 and a second welding ribbon 220, the battery cell 10 is connected to an adjacent battery cell 10 through the first welding ribbon 120, and is connected to another adjacent battery cell 10 through the second welding ribbon 220, so as to obtain a battery string 12.

[0096] The battery cell 10 in this embodiment is a BC battery without a main grid. The second surface 10b of the battery cell 10 is the back surface of the battery cell 10. The second surface 10b of the battery cell 10 is alternately provided with positive electrode fine grids and negative electrode fine grids.

[0097] A plurality of battery cells 10 are arranged along a preset direction X, and then a first welding ribbon 120 and a second welding ribbon 220 are laid on the second surface 10b of each battery cell 10, respectively, so as to connect the positive electrode fine grid of the current battery cell 10 with the negative electrode fine grid (or the positive electrode fine grid, depending on the series connection sequence) of the adjacent battery cell 10. The second welding ribbon 220 connects the negative electrode fine grid of the current battery cell 10 with the positive electrode fine grid (or the negative electrode fine grid) of the adjacent battery cell 10, so as to connect the plurality of battery cells 10 into a battery string 12.

[0098] Step S102: Lay a whole layer of the first coating layer 13 on the battery string 12, the first coating layer 13 is in direct contact with the second surface 10b of each battery cell 10 to fix the battery cell 10 and the first welding strip 120 and the second welding strip 220 located on the second surface 10b of the battery cell 10; the pre-cross-linking degree of the first coating layer 13 on the side close to the battery cell 10 is 30%-50%.

[0099] A whole first coating layer 13 is laid on the battery string 12, and the first coating layer 13 covers the second surface 10b of each battery cell 10 and the first welding strip 120 and the second welding strip 220 thereon, and the first coating layer 13 fixes each battery cell 10 to the first welding strip 120 and the second welding strip 220 on the second surface 10b.

[0100] The pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 is 30%-50%. For example, the pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 can be 30%, 33%, 35%, 38%, 40%, 43%, 45%, 47%, 49% or 50%.

[0101] The first coating layer 13 can be made of ethylene-polyvinyl acetate (EVA), polyolefin (POE) or high-performance thermoplastic polyurethane (TPU), thermoplastic polyolefin (TPO) coating materials with high heat resistance and low adhesive permeability.

[0102] Step S103 : laying a first adhesive film layer 15 on the glass front plate 11 , with the first surface 10 a of the cell 10 facing the glass front plate 11 and the second surface 10 b of the cell 10 away from the glass front plate 11 , and placing the cell string 12 on the first adhesive film layer 15 .

[0103] A first adhesive film layer 15 is provided and laid on the glass front plate 11. For example, the first adhesive film layer 15 can be made of ethylene-polyvinyl acetate (EVA), polyolefin (POE), cross-linked polyolefin (PO), thermoplastic polyurethane (TPU), polyvinyl butyral (PVB), silane-grafted ethylene copolymer, ethylene-methacrylic acid ionomer and the like.

[0104] The battery string 12 is turned over so that the first surface 10 a of the battery cell 10 faces the glass front plate 11 , and then the battery string 12 is placed on the first adhesive film layer 15 to fix the battery string 12 on the glass front plate 11 .

[0105] Step S104: a packaging film 14 is provided on the outer periphery of the battery string 12 . The packaging film 14 surrounds the circumferential edge of the battery string 12 . The packaging film 14 is obtained by sequentially splicing a plurality of adhesive strips.

[0106] Rubber strips are sequentially arranged along the circumferential edge of the battery string 12, and a plurality of rubber strips are spliced ​​into a packaging film 14. In the present embodiment, the packaging film 14 is arranged on the side of the first film layer 15 away from the glass front plate 11, and the packaging film 14 covers the circumferential edge of the battery string 12 and the circumferential edge of the first coating layer 13 to avoid overflow of glue at the edge of the first coating layer 13 during the lamination process, and to avoid misalignment or cold soldering problems caused by material flow of the first coating layer 13.

[0107] The manufacturing method of the photovoltaic module of the present embodiment, for BC cells without a main grid, is to lay a first coating layer 13 on the back of the battery string 12 by means of a whole-layer coating. The pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 is higher. The side of the first coating layer 13 close to the battery cell 10 can better maintain the shape and position stability, optimize the lamination performance of the first coating layer 13, and can effectively solve the problems of glue seepage, cold soldering, etc. in the low-temperature coating assembly, which is beneficial to improving the photoelectric conversion efficiency and long-term stability of the photovoltaic module 1. At the same time, the present embodiment reduces the number of film layers of the battery string 12, can reduce the production cost of the photovoltaic module 1, and can improve the market competitiveness of the photovoltaic module 1.

[0108] In some embodiments, the pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 is greater than the pre-crosslinking degree of the first coating layer 13 on the side away from the battery cell 10, and the fluidity of the first coating layer 13 on the side close to the battery cell 10 is less than the fluidity of the first coating layer 13 on the side away from the battery cell 10.

[0109] In some embodiments, the pre-crosslinking degree of the first coating layer 13 on the side away from the battery cell 10 is 0%-10%. For example, the pre-crosslinking degree of the first coating layer 13 on the side away from the battery cell 10 can be 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%.

[0110] In some embodiments, after step S104 , step S105 is further performed: placing a glass back plate 17 on a side of the first coating layer 13 away from the battery string 12 to form a photovoltaic module 1 .

[0111] Step S106 : laminating the photovoltaic module 1 so that the first welding ribbon 120 is alloyed and connected to the negative electrode fine grid (or positive electrode fine grid) of the battery cell 10 , and the second welding ribbon 220 is alloyed and connected to the positive electrode fine grid (or negative electrode fine grid) of the battery cell 10 .

[0112] According to an exemplary embodiment, the present disclosure provides a method for manufacturing a photovoltaic module, such as Fig.13 As shown, the method for manufacturing a photovoltaic module of this embodiment includes:

[0113] Step S201 : providing a plurality of battery cells 10 and a plurality of soldering ribbons 20 , wherein the soldering ribbon 20 comprises a first connecting portion 21 and a second connecting portion 22 connected to each other.

[0114] The cell 10 in this embodiment is a TOPCon cell without a main grid. The first surface 10a of the cell 10 is the front surface, and the first surface 10a is provided with a positive electrode fine grid, and the second surface 10b of the cell 10 is the back surface, and the second surface 10b is provided with a negative electrode fine grid.

[0115] Step S202: Place a battery cell 10, place a welding tape 20 on the battery cell 10, place the first connection portion 21 of the welding tape 20 on the second side 10b of the battery cell 10, lay a first coating layer 13 on the second side 10b of the battery cell 10, the first coating layer 13 is in direct contact with the second side 10b of the battery cell 10 to fix the battery cell 10 and the first connection portion 21 of the welding tape 20 located on the second side 10b of the battery cell 10, wherein the pre-cross-linking degree of the first coating layer 13 on the side close to the battery cell 10 is 30%-50%; then place another battery cell 10 on the second connection portion 22 of the welding tape 20.

[0116] The first connection portion 21 of the welding ribbon 20 is placed on the second surface 10b of the battery cell 10 and connected to the negative electrode fine grid of the battery cell 10. Another battery cell 10 is placed on the second connection portion 22 of the welding ribbon 20, and the second connection portion 22 is connected to the positive electrode fine grid of another battery cell 10, so that the two battery cells 10 are connected in series through the welding ribbon 20.

[0117] For example, the pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 may be 30%, 33%, 35%, 38%, 40%, 43%, 45%, 47%, 49% or 50%.

[0118] Step S203: Repeat the steps of placing the welding ribbon 20 on the battery cell 10, placing another battery cell 10 on the second connecting portion 22, and laying the first coating layer 13 on the back of the battery cell 10 to produce a battery string 12; the multiple battery cells 10 of the battery string 12 are arranged in sequence along a preset direction X, and along the preset direction X, the first connecting portion 21 is connected to the second side 10b of one battery cell 10, and the second connecting portion 22 is connected to the first side 10a of the next battery cell 10 arranged in sequence.

[0119] The welding strip 20 connects the positive electrode fine grid of the current battery cell 10 with the negative electrode fine grid (or positive electrode fine grid, depending on the series connection sequence) of the adjacent battery cell 10 to form a battery string 12. The second surface 10b of each battery cell 10 of the battery string 12 is covered with a first coating layer 13.

[0120] Step S204: flip the battery string 12, and lay the second coating layer 16 on the first surface 10a of each battery cell 10 of the battery string 12, the second coating layer 16 is in direct contact with the first surface 10a of the battery cell 10, the second coating layer 16 fixes the battery cell 10 and the second connecting portion 22 located on the first surface 10a of the battery cell 10, and the pre-cross-linking degree of the second coating layer 16 on the side close to the battery cell 10 is 30%-50%.

[0121] The second coating layer 16 is laid on the first surface 10a of each battery cell 10, and the second coating layer 16 fixes the first surface 10a of the battery cell 10 and the second connection portion 22 of the welding ribbon 20. The pre-crosslinking degree of the second coating layer 16 on the side close to the battery cell 10 is 30%-50%. For example, the pre-crosslinking degree of the second coating layer 16 on the side close to the battery cell 10 can be 30%, 33%, 35%, 38%, 40%, 43%, 45%, 47%, 49% or 50%.

[0122] Step S205 : placing the battery string 12 on the glass front plate 11 with the first surface 10 a of the battery cell 10 facing the glass front plate 11 and the second surface 10 b of the battery cell 10 away from the glass front plate 11 .

[0123] Step S206 : a packaging film 14 is provided on the outer periphery of the battery string 12 . The packaging film 14 surrounds the circumferential edge of the battery string 12 . The packaging film 14 is obtained by sequentially splicing a plurality of adhesive strips.

[0124] The packaging film 14 is arranged on the glass front plate 11, and the packaging film 14 covers the circumferential edge of the battery string 12, the edge of the circumferential first coating layer 13 of the battery string 12, and the edge of the circumferential second coating layer 16 of the battery string 12, so as to avoid misalignment or cold soldering problems caused by overflow of the edges of the first coating layer 13 and the second coating layer 16 during the lamination process.

[0125] According to the manufacturing method of the photovoltaic module of the present embodiment, for the TOPCon battery without main grid, the first coating layer 13 is laid on the second surface 10b of each battery cell 10 to fix the first connection portion 21 of the second surface 10b and the welding tape 20, and the second coating layer 16 is laid on the first surface 10a of each battery cell 10 to fix the first surface 10a and the second connection portion 22 of the welding tape 20. The first coating layer 13 and the second coating layer 16 on the side close to the battery cell 10 both have a high degree of pre-crosslinking, which can better maintain the shape and position stability, optimize the lamination performance of the photovoltaic module 1, and can effectively solve the problems of glue seepage, cold welding, etc. existing in the low-temperature coating module, which is beneficial to improve the photoelectric conversion efficiency and long-term stability of the photovoltaic module 1; at the same time, it can also reduce the production cost of the photovoltaic module 1, and can improve the market competitiveness of the photovoltaic module 1.

[0126] In some embodiments, the pre-crosslinking degree of the first coating layer 13 on the side close to the battery cell 10 is greater than the pre-crosslinking degree of the first coating layer 13 on the side away from the battery cell 10, and the fluidity of the first coating layer 13 on the side close to the battery cell 10 is less than the fluidity of the first coating layer 13 on the side away from the battery cell 10; the pre-crosslinking degree of the first coating layer 13 on the side away from the battery cell 10 is 0%-10%. For example, the pre-crosslinking degree of the first coating layer 13 on the side away from the battery cell 10 may be 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%.

[0127] In some embodiments, the pre-crosslinking degree of the second coating layer 16 on the side close to the battery cell 10 is greater than the pre-crosslinking degree of the second coating layer 16 on the side away from the battery cell 10, and the fluidity of the second coating layer 16 on the side close to the battery cell 10 is less than the fluidity of the second coating layer 16 on the side away from the battery cell 10; the pre-crosslinking degree of the second coating layer 16 on the side away from the battery cell 10 is 0%-10%. For example, the pre-crosslinking degree of the second coating layer 16 on the side away from the battery cell 10 may be 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%.

[0128] In some embodiments, Figure 8 , Fig. 9 As shown, after flipping the battery string 12 in step S204, a whole layer of the second coating layer 16 is laid on the battery string 12, and the second coating layer 16 covers the first surface 10a of each battery cell 10 and the second connecting portion 22 located on the first surface 10a of the battery cell 10. In this way, the step of laying the second coating layer 16 only needs to be performed once to fix the second connecting portion 22 of the first surface 10a of each battery cell 10, and the manufacturing process is simpler, which can effectively save manufacturing time and improve processing efficiency.

[0129] In some embodiments, Fig.10 , Fig.11As shown, the second connection portion 22 of the welding ribbon 20 can be placed on the first side 10a of the battery cell 10, and the second coating layer 16 can be covered on the first side 10a of each battery cell 10. Then, another battery cell 10 can be placed on the first connection portion 21 of the welding ribbon 20. After the multiple battery cells 10 are connected together by the welding ribbon 20, the battery string 12 is flipped over, and a whole layer of the first coating layer 13 is laid on the battery string 12. In this way, the step of laying the first coating layer 13 only needs to be performed once to fix the first connection portion 21 of the second side 10b of each battery cell 10.

[0130] In some embodiments, after step S206 , step S207 is further performed: placing a glass back plate 17 on a side of the first coating layer 13 away from the battery string 12 to form a photovoltaic module 1 .

[0131] Step S208 : laminating the photovoltaic module 1 so that the first connection portion 21 of the welding ribbon 20 is alloyed and connected to the negative electrode fine grid of the second side 10b of the battery cell 10 , and the second welding ribbon 220 is alloyed and connected to the positive electrode fine grid of the first side 10a of the battery cell 10 .

[0132] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features of the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0133] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A photovoltaic module, characterized in that: include: A battery string is arranged on one side of the glass front plate, the battery string includes a plurality of battery cells arranged in sequence along a preset direction, the battery cells are sequentially connected by welding strips, a first surface of the battery cell faces the glass front plate, and a second surface of the battery cell faces away from the glass front plate; A first coating layer is laid on the side of the battery string away from the glass front plate, and the first coating layer is in direct contact with the second side of the battery cell to fix the battery cell and the welding strip located on the second side of the battery cell; the pre-crosslinking degree of the first coating layer on the side close to the battery cell is 30%-50%; The packaging film surrounds the circumferential edge of the battery string, and the packaging film is obtained by sequentially splicing a plurality of adhesive strips.

2. The photovoltaic module according to claim 1, characterized in that: The pre-crosslinking degree of the first coating layer on the side close to the battery cell is greater than the pre-crosslinking degree of the first coating layer on the side away from the battery cell, and the fluidity of the first coating layer on the side close to the battery cell is less than the fluidity of the first coating layer on the side away from the battery cell; The pre-crosslinking degree of the first coating layer on the side away from the battery cell is 0%-10%.

3. The photovoltaic module according to claim 2, characterized in that: The first coating layer includes multiple layers of sub-adhesive film layers stacked in sequence on the battery cell; the pre-crosslinking degree of the multiple layers of the sub-adhesive film layers gradually increases in the direction away from the battery cell; and the difference in the pre-crosslinking degree of two adjacent layers of the sub-adhesive film layers is the same in the direction away from the battery cell.

4. The photovoltaic module according to any one of claims 1 to 3, characterized in that: The second surface of each of the battery cells is paved with a first welding ribbon and a second welding ribbon, and the battery cell is connected to an adjacent battery cell through the first welding ribbon and is connected to another adjacent battery cell through the second welding ribbon; The first covering layer is entirely laid on a side of the battery string away from the glass front plate, and the first covering layer covers the second side of each battery cell and the first welding strip and the second welding strip located on the second side of the battery cell; A first adhesive film layer is laid between the battery string and the glass front plate, and the battery string is connected to the glass front plate through the first adhesive film layer.

5. The photovoltaic module according to any one of claims 1 to 3, characterized in that: The welding strip comprises a first connecting portion and a second connecting portion connected to each other, wherein along the preset direction, the first connecting portion is connected to the second surface of one of the battery cells, and the second connecting portion is connected to the first surface of the next battery cell arranged in sequence; A piece of the first covering layer is laid on the second surface of each of the battery cells, and the first covering layer fixes the battery cell and the first connecting portion located on the second surface of the battery cell; A second coating layer is also laid on the first surface of each battery cell, and the second coating layer fixes the battery cell and the second connecting portion located on the first surface of the battery cell. The pre-crosslinking degree of the second coating layer on the side close to the battery cell is 30%-50%; the battery string is connected to the glass front panel through the second coating layer.

6. The photovoltaic module according to claim 5, characterized in that: The first coating layer is the same as the second coating layer.

7. A method for manufacturing a photovoltaic module, characterized in that: include: Arrange a plurality of battery cells in sequence along a preset direction, lay welding strips on the second surface of the battery cells along the preset direction, the welding strips include a first welding strip and a second welding strip, the battery cell is connected to an adjacent battery cell through the first welding strip, and is connected to another adjacent battery cell through the second welding strip, so as to obtain a battery string; Laying a whole first coating layer on the battery string, the first coating layer directly contacts the second surface of each battery cell to fix the battery cell to the first welding strip and the second welding strip located on the second surface of the battery cell; the pre-crosslinking degree of the first coating layer on the side close to the battery cell is 30%-50%; Laying a first adhesive film layer on the glass front plate, with the first surface of the battery sheet facing the glass front plate, the second surface of the battery sheet facing away from the glass front plate, and placing the battery string on the first adhesive film layer; A packaging film is arranged on the outer periphery of the battery string, the packaging film surrounds the circumferential edge of the battery string, and the packaging film is obtained by sequentially splicing a plurality of adhesive strips.

8. The method for manufacturing a photovoltaic module according to claim 7, characterized in that: The pre-crosslinking degree of the first coating layer on the side close to the battery cell is greater than the pre-crosslinking degree of the first coating layer on the side away from the battery cell, and the fluidity of the first coating layer on the side close to the battery cell is less than the fluidity of the first coating layer on the side away from the battery cell; The pre-crosslinking degree of the first coating layer on the side away from the battery cell is 0%-10%.

9. A method for manufacturing a photovoltaic module, characterized in that: include: Providing a plurality of battery cells and a plurality of welding strips, wherein the welding strips include a first connecting portion and a second connecting portion connected to each other; Place a battery cell, place a welding strip on the battery cell, place the first connection portion of the welding strip on the second surface of the battery cell, lay a first coating layer on the second surface of the battery cell, the first coating layer is in direct contact with the second surface of the battery cell, so as to fix the battery cell and the first connection portion of the welding strip on the second surface of the battery cell, wherein the pre-crosslinking degree of the first coating layer on the side close to the battery cell is 30%-50%; then place another battery cell on the second connection portion of the welding strip; Repeat the steps of placing a welding ribbon on the battery cell, placing another battery cell on the second connecting portion, and laying a first coating layer on the back of the battery cell to manufacture a battery string; the multiple battery cells of the battery string are arranged in sequence along a preset direction, along the preset direction, the first connecting portion is connected to the second surface of one of the battery cells, and the second connecting portion is connected to the first surface of the next battery cell arranged in sequence; Turning over the battery string, laying a second coating layer on the first surface of each battery cell in the battery string, the second coating layer directly contacts the first surface of the battery cell, the second coating layer fixes the battery cell and the second connecting portion located on the first surface of the battery cell, and the pre-crosslinking degree of the second coating layer on the side close to the battery cell is 30%-50%; With the first surface of the battery sheet facing the glass front plate and the second surface of the battery sheet facing away from the glass front plate, the battery string is placed on the glass front plate; A packaging film is arranged on the outer periphery of the battery string, the packaging film surrounds the circumferential edge of the battery string, and the packaging film is obtained by sequentially splicing a plurality of adhesive strips.

10. The method for manufacturing a photovoltaic module according to claim 9, characterized in that: The pre-crosslinking degree of the first coating layer on the side close to the battery cell is greater than the pre-crosslinking degree of the first coating layer on the side away from the battery cell, and the fluidity of the first coating layer on the side close to the battery cell is less than the fluidity of the first coating layer on the side away from the battery cell; The pre-crosslinking degree of the first coating layer on the side away from the battery cell is 0%-10%.

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