Photovoltaic module and its printing glue process

Abstract

The present application relates to a photovoltaic module and a glue printing process thereof, wherein the photovoltaic module includes a battery string, the battery string includes multiple battery cells, multiple welding strips and multiple glue points, adjacent battery cells are electrically connected through the welding strips, the battery cells and the welding strips are welded and fixed at the welding points, and the battery cells and the welding strips are bonded and fixed at the glue points; the welding points include a first welding point and a second welding point, at least one glue point is located between the first welding point and the second welding point, and multiple glue points are distributed along a first direction; at least some of the glue points on adjacent welding strips are staggered in the first direction, when the relative position of the glue printing device and the battery cell in the first direction deviates, on a fine grid, the risk of all the glue printing positions being far away from the contact position of the welding strip and the fine grid is reduced, and the risk of electrical connection failure between the fine grid and all the welding strips is reduced, thereby improving the working stability of the battery cell and the photovoltaic module.

Description

Technical Field

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

[0002] The photovoltaic module includes a battery string, which is formed by multiple battery cells connected in series or in parallel. Multiple fine grids are set on the surface of the battery cell. When the battery cell is a main grid-less battery cell, the fine grids of adjacent battery cells are connected by welding ribbons. In the processing of the battery string, it is necessary to first pre-fix the welding ribbons to the surface of the battery cell at the preset welding points through a welding process, and then apply glue at the preset glue points through a glue printing process. After the glue is cured, the welding ribbons and the battery cell are fixed.

[0003] Normally, the glue dots on the cell are evenly arranged in the length and width directions of the cell, that is, the glue dots are aligned one by one in the length direction of the cell, and the glue dots are also aligned one by one in the width direction of the cell. During the glue printing process on the cell, if the relative position of the cell and the glue printing device shifts, the actual printing position of the glue will deviate from all the preset glue dots, and there is a risk of separation of the solder ribbon and the fine grid due to bending deformation of the solder ribbon. Compared with the preset glue dots, since all the glue printing positions have shifted, there is a risk of separation of one or several fine grids from all the solder ribbons, thereby affecting the output power of the photovoltaic module. Summary of the Invention

[0004] The present application provides a photovoltaic module and a glue printing process thereof, which can reduce the risk of failure of electrical connection between solder strips and fine grids.

[0005] According to a first aspect of the present application, there is provided a photovoltaic module, comprising a battery string, wherein the battery string comprises a plurality of battery cells, a plurality of welding strips and a plurality of glue points, wherein adjacent battery cells are electrically connected via welding strips, the welding strips extend along a first direction, and the plurality of welding strips are spaced apart along a second direction, welding points are provided on the battery cells, the battery cells and the welding strips are welded and fixed at the welding points, a portion of at least one glue point is located on the surface of the battery cell, and another portion is located on the surface of the welding strip, so that the battery cell and the welding strip are bonded and fixed at the glue points; the welding points comprise a first welding point and a second welding point, and the first welding point and the second welding point are respectively located on both sides of the battery cell along the first direction, at least some of the glue points are located between the first welding point and the second welding point, and the plurality of glue points are distributed along the first direction; the welding strips comprise at least a first welding strip and a second welding strip distributed along the second direction, and at least some of the glue points on the first welding strip and at least some of the glue points on the second welding strip are staggered in the first direction.

[0006] In a possible design, first welding points on adjacent welding strips face each other in the second direction; and second welding points on adjacent welding strips face each other in the second direction.

[0007] In one possible design, the glue spots include at least a first glue spot, a second glue spot, and a third glue spot. Along the first direction, the third glue spot is located between the first glue spot and the second glue spot, and multiple third glue spots are distributed at intervals. In the first direction, the first glue spot is located on the side of the first weld point away from the second weld point, or the first glue spot is located between the first weld point and the second weld point, or, in the third direction, at least part of the first glue spot is located above the first weld point; and / or, in the first direction, the second glue spot is located on the side of the second weld point away from the first weld point, or the second glue spot is located between the first weld point and the second weld point, or, in the third direction, at least part of the second glue spot is located above the second weld point.

[0008] In one possible design, the first glue point on the first welding ribbon is directly opposite to the first glue point on the second welding ribbon in the second direction, and / or the second glue point on the first welding ribbon is directly opposite to the second glue point on the second welding ribbon in the second direction; the third glue point on the first welding ribbon is staggered with the third glue point on the second welding ribbon in the first direction.

[0009] In a possible design, along the first direction, the plurality of third glue dots are evenly distributed between the first glue dot and the second glue dot.

[0010] In a possible design, the number N1 of the third glue dots distributed in the first direction satisfies: 4≤N1≤21.

[0011] In a possible design, the length of the first glue dot in the first direction is 6 mm to 9 mm, and / or the length of the second glue dot in the first direction is 6 mm to 9 mm.

[0012] In one possible design, the glue dots also include a fourth glue dot, and along the first direction, the fourth glue dot is located between the first glue dot and the second glue dot, and the third glue dot is located between the fourth glue dot and the second glue dot; the length of the first glue dot in the first direction is 0.2mm~0.4mm, the length of the fourth glue dot in the first direction is 0.2mm~0.4mm, and the distance between the first glue dot and the fourth glue dot in the first direction is 6mm~9mm; and / or, the glue dots also include a fifth glue dot, and along the first direction, the fifth glue dot is located between the first glue dot and the second glue dot, and the third glue dot is located between the first glue dot and the fifth glue dot; the length of the second glue dot in the first direction is 0.2mm~0.4mm, the length of the fifth glue dot in the first direction is 0.2mm~0.4mm, and the distance between the second glue dot and the fifth glue dot in the first direction is 6mm~9mm.

[0013] In one possible design, along the first direction, the distance S1 between the first welding point and the edge of the battery cell satisfies: 7mm≤S1≤8mm; along the second direction, the distance S2 between the first welding point and the edge of the battery cell satisfies: 7mm≤S2≤8mm; and / or, along the first direction, the distance S3 between the second welding point and the edge of the battery cell satisfies: 7mm≤S3≤8mm; along the second direction, the distance S4 between the second welding point and the edge of the battery cell satisfies: 7mm≤S4≤8mm.

[0014] In one possible design, in the first direction, the first glue point is located on the side of the first weld point away from the second weld point, or the first glue point is located between the first weld point and the second weld point; along the first direction, the distance S5 between the first glue point and the first weld point satisfies: 1mm≤S5≤2mm; and / or, in the first direction, the second glue point is located on the side of the second weld point away from the first weld point, or the second glue point is located between the first weld point and the second weld point, and along the first direction, the distance S6 between the second glue point and the second weld point satisfies: 1mm≤S6≤2mm.

[0015] In a possible design, the number N2 of the welding strips in the second direction satisfies: 16≤N2≤14.

[0016] A second aspect of the present application provides a glue printing process for a photovoltaic module, wherein the photovoltaic module is any one of the photovoltaic modules described above, and the glue printing process for the photovoltaic module includes: arranging a plurality of battery cells at intervals along a first direction, and placing welding strips on the battery cells; pre-welding the battery cells and welding strips at welding points to form a pre-fixed battery string; placing the pre-fixed battery string on a glue printing device, and the glue printing device printing glue on the pre-fixed battery string to form glue spots.

[0017] In one possible design, the glue printing device includes a substrate, a glue printing screen and a scraper, the glue printing screen is provided with mesh holes, and the side of the glue printing screen facing the scraper is covered with the glue; the step of the glue printing device printing glue on the pre-fixed battery string to form glue points includes: placing the pre-fixed battery string on the substrate, along the third direction, the pre-fixed battery string is located between the glue printing screen and the substrate; the glue printing screen moves along the third direction so that the surface of the glue printing screen contacts the soldering ribbon; the scraper moves along the third direction and abuts against the surface of the glue printing screen away from the battery cell, and the glue printing screen is locally deformed toward the battery cell under the drive of the scraper; the scraper moves along the first direction, and the glue flows through the mesh holes to the soldering ribbon and the surface of the battery cell under the drive of the scraper; after the scraper completes a glue printing stroke, the scraper and the glue printing screen move along the third direction away from the battery cell; the pre-fixed battery string is stepped to the curing device to promote the curing of the glue to form glue points.

[0018] In one possible design, the printing glue screen includes a plate body, the plate body is provided with a connection area and a printing glue area, the mesh is provided in the printing glue area, the connection area is provided outside the printing glue area, and the connection area is connected to the substrate; the printing glue area includes at least a third area and a fourth area, and the third area and the fourth area are spaced apart along the first direction; the battery cell includes a first battery cell and a second battery cell adjacent to each other along the first direction; the step of moving the scraper along the first direction so that the glue flows through the mesh to the surface of the soldering ribbon and the battery cell under the drive of the scraper includes: along the first direction, the scraper moves from the connection area to the third area and continues to move, and the glue flows through the mesh in the third area to the surface of the soldering ribbon and the first battery cell; along the first direction, the scraper moves from the third area to the fourth area and continues to move, and the glue flows through the mesh in the fourth area to the surface of the soldering ribbon and the second battery cell.

[0019] In a possible design, a minimum distance S7 between the meshes in the third area and the meshes in the fourth area in the first direction satisfies: 15 mm ≤ S7 ≤ 25 mm.

[0020] In the present application, at least part of the glue points on the first welding strip and at least part of the glue points on the second welding strip are staggered in the first direction X. When the relative position of the glue printing device and the battery cell in the first direction deviates, due to the staggered arrangement of the glue points, on a fine grid, part of the glue printing position is far away from the contact position between the welding strip and the fine grid, and another part of the glue printing position is close to the contact position between the welding strip and the fine grid, thereby reducing the risk that all the glue printing positions are far away from the contact position between the welding strip and the fine grid, and reducing the risk of electrical connection failure between the fine grid and all the welding strips, thereby improving the working stability of the battery cell and the photovoltaic module.

[0021] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of a photovoltaic module provided in this application in one embodiment;

[0023] Figure 2 A schematic diagram of the printing glue points of a battery cell provided in this application in one embodiment;

[0024] Figure 3 A schematic diagram of the printing points of the battery cell provided in this application in another embodiment;

[0025] Figure 4 A schematic diagram of a partial structure of an embodiment of the printing glue device provided in this application;

[0026] Figure 5 for Figure 4 A top view of the printing offset screen in one embodiment;

[0027] Figure 6 for Figure 5 sectional view of

[0028] Figure 7 for Figure 4 A top view of the printing offset screen in another embodiment;

[0029] Figure 8 for Figure 7 sectional view of

[0030] Figure 9 for Figure 4 A top view of the printing offset screen in yet another embodiment;

[0031] Figure 10 for Figure 9 sectional view of

[0032] Figure 11 for Figure 4 A cross-sectional view of a printing offset screen in yet another embodiment;

[0033] Figure 12 Schematic diagram comparing the surface structures of the magnetron sputtering hydrophobic coating of the present application and the BM coating in the prior art;

[0034] Figure 13 A schematic diagram of a partial structure of an embodiment of the printing glue device provided in this application;

[0035] Figure 14 for Figure 13 A top view of the printing offset screen in one embodiment.

[0036] Reference numerals:

[0037] 100-first cover plate;

[0038] 200-first adhesive film;

[0039] 300-battery string;

[0040] 400-second adhesive film;

[0041] 500-second cover plate;

[0042] 10-battery cell;

[0043] 101-fine grid;

[0044] 20-welding strip;

[0045] 30-welding points;

[0046] 301-first welding point;

[0047] 302-second welding point;

[0048] 40-outer frame;

[0049] 401-Part 1;

[0050] 401A-first surface;

[0051] 402-Part 2;

[0052] 402A-second surface;

[0053] 50-connecting glue;

[0054] 60-glue dots;

[0055] 601-first glue point;

[0056] 602-second glue point;

[0057] 603-third glue point;

[0058] 604-fourth glue point;

[0059] 605-fifth glue point;

[0060] 70-matrix;

[0061] 80-printing offset screen;

[0062] 90-scraper;

[0063] 901-first scraper;

[0064] 902-second scraper;

[0065] 1-Plate body;

[0066] 11- connection area;

[0067] 111-first area;

[0068] 112-Second Area;

[0069] 12- rubber printing area;

[0070] 121- third surface;

[0071] 122-third area;

[0072] 123-4th area;

[0073] 13-convex rib;

[0074] 131- fourth surface;

[0075] 2-mesh;

[0076] 21-first channel;

[0077] 22- second channel;

[0078] 23- third channel;

[0079] 24- the fourth channel;

[0080] 25-unit row;

[0081] 251-1st unit row;

[0082] 252-Unit 2 row;

[0083] 26-Fifth channel;

[0084] 3- Hydrophobic coating;

[0085] 4-Center axis.

[0086] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0087] 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.

[0088] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0089] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0090] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0091] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described based on the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also be indirectly connected to the other element "on" or "under" through an intermediate element.

[0092] In a first aspect, the present invention provides a photovoltaic module. In the field of photovoltaic power generation technology, a photovoltaic module is a core component that converts solar energy into electrical energy. Figure 1 As shown, the photovoltaic module includes a first cover plate 100, a first adhesive film 200, a battery string 300, a second adhesive film 400, and a second cover plate 500 stacked along its thickness direction. The first cover plate 100 and the battery string 300 are encapsulated and fixed by the first adhesive film 200, and the second cover plate 500 and the battery string 300 are encapsulated and fixed by the second adhesive film 400. Other layers may be provided between the first cover plate 100 and the first adhesive film 200, between the first adhesive film 200 and the battery string 300, between the battery string 300 and the second adhesive film 400, and between the second adhesive film 400 and the second cover plate 500. The specific number of layers in the photovoltaic module is not particularly limited in this embodiment of the present application.

[0093] In the length direction and width direction of the photovoltaic module, one is recorded as the first direction X, and the other is recorded as the second direction Y. The thickness direction of the photovoltaic module is recorded as the third direction Z. The battery string 300 includes a plurality of battery cells 10 arranged along the first direction X and the second direction Y. In the first direction X and the second direction Y, one is the length direction of the battery cell 10, and the other is the width direction of the battery cell 10.

[0094] Among them, the embodiments of the present application do not specifically limit the type of battery cell 10. The types of battery cell 10 include but are not limited to Passivated Emitter Rear Cell (PERC), Tunnel Oxide Passivated Contact (TOPCon), Intrinsic Thin-film Heterojunction Cell (HJT), Interdigitated Back Contact (IBC), Perovskite Cell, etc.

[0095] A PERC cell, along its thickness, consists of a front-surface silver electrode, a front-surface silicon nitride passivation layer, a phosphorus emitter layer, a P-type silicon substrate layer, a partial aluminum back field, a metal aluminum back electrode, and a back passivation layer (Al2O3 / SiNx). PERC cells use a passivation film on the back side, replacing a full aluminum back field. This enhances internal back reflection of light from the silicon substrate, reduces the back recombination rate, and increases cell efficiency by 0.5%-1%.

[0096] For TOPCon cells, along their thickness, they consist of a metallic silver electrode, a front-surface silicon nitride passivation layer, a boron-doped emitter, an N-type base silicon layer, a diffused doped layer, ultra-thin silicon oxide, doped polysilicon, silicon nitride, and a metallic silver electrode. The back of the cell is composed of an ultra-thin silicon oxide layer (1nm to 2nm) and a phosphorus-doped microcrystalline amorphous mixed Si film, which together form a passivated contact structure. This structure can block minority carrier-hole recombination, thereby increasing the cell's open-circuit voltage and short-circuit current. The ultra-thin oxide layer allows majority electrons to tunnel into the polysilicon layer while blocking minority carrier-hole recombination. The excellent passivation effect of the ultra-thin silicon oxide and heavily doped silicon film causes the energy bands on the silicon wafer to bend, thereby forming a field passivation effect. This significantly increases the probability of electron tunneling, reduces contact resistance, and increases the cell's open-circuit voltage and short-circuit current, thereby improving the cell's conversion efficiency.

[0097] For HJT cells, along their 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.

[0098] An IBC cell, along its thickness, consists of a silicon nitride inversion layer, an N+ front surface field, an N-type base silicon layer, a P+ emitter, an N+ back field, an aluminum oxide passivation layer, a silicon nitride anti-reflection layer, and a silver electrode. IBC cells utilize ion implantation technology to achieve uniform P and N regions with precisely controlled junction depths. The front of the cell is free of grid lines, eliminating current losses from metal electrode shading and maximizing the utilization of incident photons. This improves short-circuit current by approximately 7% compared to conventional solar cells. Due to the back-contact structure, grid line shading is not a concern, allowing for a wider grid line ratio, reducing series resistance and achieving a high fill factor. Optimized surface passivation and light-trapping structures enable a low front-surface recombination rate and surface reflection.

[0099] A perovskite cell, along its thickness, consists of a substrate material, a conductive film, an electron transport layer (titanium dioxide), a perovskite absorption layer (hole transport layer), and a metal cathode. Perovskite materials have a high light absorption coefficient and a long carrier diffusion distance. After photons absorbed by the perovskite material are converted into electrons, they are easily collected by the electrode with minimal loss. This results in a high photogenerated voltage and current, giving perovskites high photoelectric conversion efficiency.

[0100] like Figure 2 As shown, the cell 10 includes a fine grid 101 extending along the second direction Y, and a plurality of fine grids 101 are arranged at intervals along the first direction X. A welding ribbon 20 extending along the first direction X is fixed to the cell 10, and a plurality of welding ribbons are arranged at intervals along the second direction Y. The welding ribbon 20 is electrically connected to at least two fine grids 101, and in the first direction X, the welding ribbon 20 is simultaneously connected to at least two cell pieces 10 to achieve series or parallel connection of adjacent cell pieces 10, as shown in FIG. Figure 2 As shown, a solder joint 30 is provided on the battery cell, and the battery cell and the solder strip are soldered and fixed at the solder joint 30. The battery string 300 also includes a plurality of glue points 60, a portion of at least one glue point 60 is located on the surface of the battery cell 10, and the other portion is located on the surface of the solder strip 20, so that the battery cell 10 and the solder strip 20 are bonded and fixed at the glue point 60; wherein, the solder strip 20 is in direct contact with the fine grid 101, that is, the main grid structure in the prior art is cancelled, so that the battery cell 10 is a main grid-free battery cell. During the preparation process of the battery cell 10, the main grid-free battery cell reduces the amount of silver paste used, which is beneficial to reducing the printing cost of the battery cell 10. At the same time, it reduces the area of ​​the grid line blocking the surface of the battery cell 10, thereby increasing the area on the battery cell 10 for contact with sunlight, which is beneficial to improving the photoelectric conversion efficiency of the battery cell 10.

[0101] In the process of preparing a busbar-less cell, silver paste is first coated on the surface of the cell 10 to form a plurality of fine grids 101, and at the same time, at least one solder joint 30 is formed. For example, two solder joints 30 are formed. Figure 2As shown, in the first direction X, two welding points 30 are distributed on both sides of the battery cell 10 for pre-fixing the same welding ribbon 20, and in the second direction Y, multiple welding points 30 are distributed at intervals for respectively fixing different welding ribbons 20; after the fine grid 101 and the welding points 30 are formed, multiple battery cells 10 are serially welded with the welding ribbons 20. Taking a welding ribbon 20 as an example, on a battery cell 10, the welding ribbon 20 is fixedly connected to the two welding points 30 distributed along the first direction X, and the welding ribbon 20 is also welded and fixed together with the fine grid 101, so that it is pre-fixed on the battery cell 10. However, due to the small size of the fine grid 101, the connection between the fine grid 101 and the welding ribbon 20 is The force is weak, and there is a risk of separation of the solder ribbon 20 and the fine grid 101 during subsequent processing, transportation, installation or use. For this reason, after the solder ribbon 20 and the battery cell 10 are pre-fixed, glue is applied to the side of the solder ribbon 20 away from the battery cell 10 at the preset glue point 60 position through a glue printing device. After the glue is cured, glue points 60 are formed. A portion of at least one glue point 60 is located on the surface of the solder ribbon 20 and another portion is located on the surface of the battery cell 10, so that the solder ribbon 20 is bonded and fixed to the surface of the battery cell 10. In addition, some glue points 60 may only be located on the surface of the solder ribbon 20 and some glue points 60 may only be located on the surface of the battery cell 10.

[0102] During the preparation process, the soldering ribbon and the battery cell are first pre-fixed by welding, which reduces the risk of the soldering ribbon shifting during the printing process, thereby improving the accuracy of the position of the soldering ribbon on the battery cell. The soldering ribbon and the battery cell are then fixed by gluing, which improves the stability of the connection between the soldering ribbon and the battery cell and reduces the risk of separation of the soldering ribbon and the battery cell during subsequent installation, transportation or use, thereby improving the working stability of the photovoltaic module and also helping to increase the service life of the photovoltaic module.

[0103] like Figure 2As shown, the welding point 30 includes at least a first welding point 301 and a second welding point 302. Along the first direction X, the first welding point 301 and the second welding point 302 are respectively located on both sides of the battery cell 10. Part of the glue point 60 can be located between the first welding point 301 and the second welding point 302, part of the glue point 60 can be located on the side of the first welding point 301 away from the second welding point 302, and part of the glue point 60 can also be located on the side of the second welding point 302 away from the first welding point 301. For example, the glue point 60 includes a first glue point 601, a second glue point 602 and a plurality of third glue points 603 distributed along the first direction X. The third glue point 603 is located between the first glue point 601 and the second glue point 602. The first glue point 601 can be located on the side of the first welding point 301 away from the second welding point 302 and there is a preset gap between it and the first welding point 301, or a part of the first glue point 601 is located on the first welding point 301 away from the second welding point 3 02 on one side, and the other part is above the first weld point 301 in the third direction Z, or, a part of the first glue point 601 is located on the side of the first weld point 301 away from the second weld point 302, a part is located above the first weld point 301 in the third direction Z and the other part is located between the first weld point 301 and the second weld point 302, or, a part of the first glue point 601 is located above the first weld point 301, and the other part is located between the first weld point 301 and the second weld point 302, or, the first glue point 601 is located on the side of the second weld point 302 away from the first weld point 301 and there is a preset gap between the second weld point 302; similarly, the second glue point 602 can also have the above five possible setting positions, which are not repeated here. By adjusting the five possible positions of the first glue point 601 and the second glue point 602, the flexibility of the setting positions of the first glue point 601 and the second glue point 602 can be improved.

[0104] For ease of description, it is assumed below that all glue points 60 are located between the first welding point 301 and the second welding point 302, that is, on a welding ribbon 20, the welding ribbon 20 is pre-fixed on the battery cell 10 by the first welding point 301 and the second welding point 302 on both sides in the first direction X. In the first direction X, the glue point 60 is arranged between the first welding point 301 and the second welding point 302, which reduces the risk of bending and moving of the welding ribbon 20 during the glue printing process on the battery cell 10.

[0105] Among them, the first welding points 301 on adjacent welding strips 20 are opposite in the second direction Y; the second welding points 302 on adjacent welding strips 20 are opposite in the second direction Y. During the process of pre-fixing the welding strips 20 and the battery cell 10 by welding, all the welding strips 20 on a battery cell 10 can be pre-fixed on the battery cell 10 at the first welding point 301 and / or the second welding point 302 at the same time, thereby reducing the risk of the welding strip 20 being offset during the welding process.

[0106] like Figure 2As shown, along the first direction X, the distance S1 between the first welding point 301 and the edge of the battery cell 10 satisfies: 7mm≤S1≤8mm, and specifically can be 7mm, 7.1mm, 7.2mm, 7.3mm, 7.4mm, 7.5mm, 7.6mm, 7.7mm, 7.8mm, 7.9mm, 8mm, etc.; along the second direction Y, the distance S2 between the first welding point 301 and the edge of the battery cell 10 satisfies: 7mm≤S2≤8mm, and specifically can be 7mm, 7.1mm, 7.2mm, 7.3mm, 7.4mm, 7.5mm, 7.6mm, 7.7mm, 7.8mm, 7.9mm, 8mm, etc.; And / or, along the first direction X, the distance S3 between the second welding point 302 and the edge of the battery cell 10 satisfies: 7mm≤S3≤8mm, and specifically can be 7mm, 7.1mm, 7.2mm, 7.3mm, 7.4mm, 7.5mm, 7.6mm, 7.7mm, 7.8mm, 7.9mm, 8mm, etc.; along the second direction Y, the distance S4 between the second welding point 302 and the edge of the battery cell 10 satisfies: 7mm≤S4≤8mm, and specifically can be 7mm, 7.1mm, 7.2mm, 7.3mm, 7.4mm, 7.5mm, 7.6mm, 7.7mm, 7.8mm, 7.9mm, 8mm, etc.

[0107] If the distance between the welding spot 30 and the edge of the cell 10 is less than 7 mm, the welding difficulty of the welding ribbon 20 and the cell 10 increases, and the welding precision required for the welding ribbon 20 and the cell 10 also increases. If the distance between the welding spot 30 and the edge of the cell 10 is greater than 8 mm, the distance between the first welding spot 301 and the second welding spot 302 in the first direction X is reduced, thereby reducing the area available for setting the glue points 60, and thus affecting the number of glue points 60 to be set. Therefore, a distance between the welding spot 30 and the edge of the cell 10 of 7 mm to 8 mm can reduce the welding difficulty and welding precision of the welding ribbon 20 and the cell 10, thereby reducing the welding cost of the welding ribbon 20 and the cell 10. At the same time, the distance between the first welding spot 301 and the second welding spot 302 in the first direction X is increased, thereby increasing the number of glue points 60 to be set.

[0108] like Figure 2As shown, the welding ribbon 20 includes at least a first welding ribbon 20 and a second welding ribbon 20 distributed along the second direction Y. At least some of the glue dots 60 on the first welding ribbon 20 and at least some of the glue dots 60 on the second welding ribbon 20 are staggered in the first direction X. When the relative position of the glue printing device and the solar cell 10 in the first direction X deviates, the glue printing position on the welding ribbon 20 deviates from the preset glue dot 60 position. Due to the staggered arrangement of the glue dots 60, on a fine grid 101, part of the glue printing position is farther from the contact position between the welding ribbon 20 and the fine grid 101, while another part of the glue printing position is closer to the contact position between the welding ribbon 20 and the fine grid 101. This reduces the risk that all the glue printing positions are far from the contact position between the welding ribbon 20 and the fine grid 101, thereby reducing the risk of electrical connection failure between the fine grid 101 and all the welding ribbons 20, thereby improving the operating stability of the solar cell 10 and the photovoltaic module.

[0109] like Figure 2 As shown, the first glue point 601 on the first welding ribbon 20 is opposite to the first glue point 601 on the second welding ribbon 20 in the second direction Y, and / or the second glue point 602 on the first welding ribbon 20 is opposite to the second glue point 602 on the second welding ribbon 20 in the second direction Y; the third glue point 603 on the first welding ribbon 20 is staggered with the third glue point 603 on the second welding ribbon 20 in the first direction X.

[0110] The glue printing device includes a base for supporting the battery cell 10, a glue printing screen for pressing against the surface of the battery cell 10, and a scraper. The scraper is used to press down the glue printing screen and scrape glue into the meshes of the screen, allowing the glue to flow along the meshes to the surfaces of the battery cell 10 and the solder ribbon 20. Specifically, the first glue dots 601 on adjacent solder ribbons 20 are aligned, and the second glue dots 602 on adjacent solder ribbons 20 are aligned. At the initial position where the scraper presses the glue printing screen, this helps to improve the consistency of the scraper's force in the second direction Y, thereby reducing the difficulty of adjusting the scraper's downward pressure.

[0111] like Figure 2 As shown, along the first direction X, multiple third glue dots 603 are evenly distributed between the first glue dot 601 and the second glue dot 602. If the third glue dots 603 are unevenly distributed, the distance between two adjacent third glue dots 603 may be small, while the distance between two adjacent third glue dots 603 may be large. Between the two third glue dots 603 with a large distance, the risk of contact failure between the solder ribbon 20 and the fine grid 101 is higher. Therefore, the uniform distribution of the third glue dots 603 between the first glue dot 601 and the second glue dot 602 can further reduce the risk of contact failure between the solder ribbon 20 and the fine grid 101, thereby improving the operating stability of the solar cell 10 and the photovoltaic module.

[0112] The number N1 of the third glue dots 603 distributed along the first direction X satisfies the following: 4 ≤ N1 ≤ 21. The number of third glue dots 603 can be 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, and so on. If the number of third glue dots 603 on the first soldering ribbon 20 is less than 4, the number of third glue dots 603 on the adjacent second soldering ribbon 20 will be even smaller, reducing the bonding reliability between the soldering ribbon 20 and the cell 10. If the number of third glue dots 603 distributed along the first direction X is greater, the adhesive printing cost for the cell 10 is increased. Therefore, 4 ≤ N1 ≤ 21 can reduce the adhesive printing cost for the cell 10 while improving the bonding reliability between the soldering ribbon 20 and the cell 10.

[0113] In one possible design, Figure 2 As shown, the length of the first glue dot 601 in the first direction X is 6mm to 9mm, and specifically can be 6mm, 6.1mm, 6.3mm, 6.5mm, 6.7mm, 6.9mm, 7mm, 7.1mm, 7.3mm, 7.5mm, 7.7mm, 7.9mm, 8mm, 8.1mm, 8.3mm, 8.5mm, 8.7mm, 8.9mm, 9mm, etc., and / or, the length of the second glue dot 602 in the first direction X is 6mm to 9mm, and specifically can be 6mm, 6.1mm, 6.3mm, 6.5mm, 6.7mm, 6.9mm, 7mm, 7.1mm, 7.3mm, 7.5mm, 7.7mm, 7.9mm, 8mm, 8.1mm, 8.3mm, 8.5mm, 8.7mm, 8.9mm, 9mm, etc.

[0114] The length of the first glue point 601 in the first direction X is 6 mm to 9 mm, and the length of the second glue point 602 in the first direction X is 6 mm to 9 mm, which can reduce the difficulty of discharging glue in the glue printing device at the first glue point 601 and the second glue point 602, and increase the amount of glue at the first glue point 601 and the second glue point 602, thereby improving the bonding stability between the soldering ribbon 20 and the battery cell 10 at the first glue point 601 and the second glue point 602.

[0115] In another possible design, such as Figure 3As shown, the glue dot 60 further includes a fourth glue dot 604. Along the first direction X, the fourth glue dot 604 is located between the first glue dot 601 and the second glue dot 602, and the third glue dot 603 is located between the fourth glue dot 604 and the second glue dot 602. The length of the first glue dot 601 in the first direction X is 0.2 mm to 0.4 mm. The length of the first glue dot 601 in the first direction X can be 0.2 mm, 0.21 mm, 0.23 mm, 0.25 mm, 0.27 mm, 0.29 mm, 0.3 mm, 0.31 mm, 0.33 mm, 0.35 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.20 mm, 0.21 mm, 0.23 mm, 0.25 mm, 0.27 mm, 0.29 mm, 0.3 The length of the fourth glue dot 604 in the first direction X is 0.2 mm to 0.4 mm. The length of the fourth glue dot 604 in the first direction X can be 0.2 mm, 0.21 mm, 0.23 mm, 0.25 mm, 0.27 mm, 0.29 mm, 0.3 mm, 0.31 mm, 0.33 mm, 0.35 mm, 0.37 mm, 0.39 mm, 0.4 mm, etc. The distance between the first glue dot 601 and the fourth glue dot 600 in the first direction X is 6 mm to 9 mm. mm; and / or, the glue dot 60 further includes a fifth glue dot 605, along the first direction X, the fifth glue dot 605 is located between the first glue dot 601 and the second glue dot 602, and the third glue dot 603 is located between the first glue dot 601 and the fifth glue dot 605; the length of the second glue dot 602 in the first direction X is 0.2mm to 0.4mm, and the length of the second glue dot 602 in the first direction X can be 0.2mm, 0.21mm, 0.23mm, 0.25mm, 0.27mm, 0.29mm, 0.3mm, 0.31mm, 0.33mm, The length of the fifth glue dot 605 in the first direction X is 0.2 mm to 0.4 mm, and the length in the first direction X can be 0.2 mm, 0.21 mm, 0.23 mm, 0.25 mm, 0.27 mm, 0.29 mm, 0.3 mm, 0.31 mm, 0.33 mm, 0.35 mm, 0.37 mm, 0.39 mm, 0.4 mm, etc. The distance between the second glue dot 602 and the fifth glue dot 605 in the first direction X is 6 mm to 9 mm. That is, the one long glue dot 60 of 6 mm to 9 mm in the previous design is replaced with two shorter glue dots 60 of 0.2 mm to 0.4 mm. This can reduce the amount of glue while maintaining the bonding stability between the solder ribbon 20 and the solar cell 10, thereby reducing the glue printing cost of the solar cell 10.

[0116] like Figure 2 and Figure 3As shown, along the first direction X, the distance S5 between the first glue point 601 and the first welding point 301 satisfies: 1mm≤S5≤2mm, and specifically can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc.; and / or, along the first direction X, the distance S6 between the second glue point 602 and the second welding point 302 satisfies: 1mm≤S6≤2mm, and specifically can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc.

[0117] If the distance between the first and second glue spots 601, 602, and the solder joint 30 is small, there is a risk that a portion of the first and second glue spots 601, 602 may be located above the solder joint 30, causing the cell 10 to become locally thicker, thereby increasing the risk of damage to the cell 10 at the first and second glue spots 601, 602, and the solder joint 30. If the distance between the first and second glue spots 601, 602, and the solder joint 30 is large, the area between the first and second glue spots 601, 602 for setting the third glue spot 603 is reduced, affecting the number of third glue spots 603 that can be set. Therefore, the distance between the first and second glue spots 601, 602, and the solder joint 30 is 1 mm to 2 mm, which reduces the risk of damage to the cell 10 at the first and second glue spots 601, 602, and the solder joint 30, and facilitates increasing the number of third glue spots 603 that can be set.

[0118] In any of the above embodiments, the length of the third welding point 30 in the first direction X is 5mm to 20mm, specifically 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, etc.

[0119] In any of the above embodiments, the number N2 of the welding ribbons 20 in the second direction Y satisfies the following relationship: 14 ≤ N2 ≤ 16. The first and second welding ribbons 20 are alternately arranged in the second direction Y. The number of welding ribbons 20 can be 14, 15, or 16. If a large number of welding ribbons 20 is provided, the distance between adjacent welding ribbons 20 is small, which increases the risk of adjacent welding ribbons 20 contacting and causing a short circuit in the cell 10. A large number of welding ribbons 20 also increases the obstruction of the cell 10 surface, thereby affecting the conversion efficiency of the cell 10. If a small number of welding ribbons 20 is provided, the current transmission efficiency of the welding ribbons 20 is low, resulting in a low output power of the photovoltaic module. Therefore, a number of welding ribbons 20 of 14 to 16 reduces the risk of adjacent welding ribbons 20 contacting and causing a short circuit in the cell 10, improves the operating stability of the cell 10, and increases the light-receiving area of ​​the cell 10, thereby improving the photoelectric conversion efficiency of the cell 10. Furthermore, the current transmission efficiency of the welding ribbons 20 is improved, thereby increasing the output power of the photovoltaic module.

[0120] The first welding ribbons 20 are symmetrically distributed with respect to the axis extending along the first direction X on the battery cell 10, and the second welding ribbons 20 are symmetrically distributed with respect to the axis extending along the first direction X on the battery cell 10. When the printing device prints glue on the battery cell 10, when the scraper is pressed down, the printing plate is evenly stressed on both sides of the second direction Y.

[0121] In addition, the two surfaces of the battery cell 10 that are relatively arranged along the third direction Z need to be bonded and fixed with the welding tape 20. For example, the light-facing surface of the battery cell 10 is provided with adjacent first welding tape 20 and second welding tape 20, and the backlight surface is provided with adjacent third welding tape 20 and fourth welding tape 20. In the third direction Z, the first welding tape 20 is located above the third welding tape 20, and the second welding tape 20 is located above the fourth welding tape 20. Then the third glue point 603 on the first welding tape 20 and the third glue point 603 on the third welding tape 20 are staggered in the first direction X, and the third glue point 603 on the second welding tape 20 and the third glue point 603 on the fourth welding tape 20 are staggered in the first direction X.

[0122] Based on the photovoltaic module in any of the above embodiments, the second aspect of the embodiment of the present application provides a printing glue device, such as Figure 4 As shown, the printing device includes a substrate 70, a printing screen 80 and a scraper 90. The substrate 70 is used to support the battery cell 10. The battery cell 10 and the printing screen 80 are distributed along the third direction Z. Figure 5As shown, the printing screen 80 includes a plate body 1 and an outer frame 40 provided on the plate body 1, the outer frame 40 is fixedly connected to the base 70, and along the thickness direction of the printing screen 80, that is, along the third direction Z, a scraper 90 is provided on the side of the printing screen 80 away from the battery cell 10, and the scraper 90 is used to press the plate body 1 along the thickness direction Z of the printing screen 80, and to scrape the glue on the printing screen 80 into the mesh 2, and the mesh 2 corresponds to the glue point 60 on the battery cell 10 one by one; wherein, as Figure 4 As shown, the scraper 90 includes a first scraper 901 and a second scraper 902 distributed along a first direction X, and the first scraper 901 and the second scraper 902 work alternately.

[0123] like Figure 4 As shown, a plurality of battery cells 10 and welding ribbons 20 are pre-welded through welding points 30 and then placed on a substrate 70. At this time, a plurality of battery cells 10 are arranged at intervals along a first direction X. In a third direction Z, the printing screen 80 is located directly above the first battery cell 10. Thereafter, the printing screen 80 is driven to move along the third direction Z toward the direction close to the battery cell 10 until the printing screen 80 abuts against the battery cell 10. Then, the first scraper 901 is driven to move along the third direction Z toward the direction close to the printing screen 80. The first scraper 901 abuts against the plate 1 and presses down the plate 1, so that there is an interaction force along the third direction Z between the first scraper 901 and the plate 1, and between the plate 1 and the battery cell 10. Thereafter, the first scraper 901 moves along the first direction X. The moving direction of the first scraper 901 can be the positive direction of the first direction X, that is, Figure 4 The arrow pointing to the first direction X may also point to the negative direction of the first direction X, i.e. Figure 4In the opposite direction of the arrow pointing to the first direction X, taking the movement of the first scraper 901 along the negative direction of the first direction X as an example, glue is provided on the side of the plate 1 away from the battery cell 10. As the first scraper 901 moves, the glue is pushed to the mesh 2 on the plate 1 and flows through the mesh 2 to the surface of the soldering ribbon 20 and the first battery cell 10. When the first scraper 901 completes a scraping stroke, it will move along the third direction Z in the direction away from the printing screen 80, and the printing screen 80 will move along the third direction Z in the direction away from the battery cell 10, so that the printing screen 80 is separated from the battery cell 10, and the first scraper 901 and the printing screen 80 are separated. 0 separation, at the same time, the base 70 drives the battery cell 10 to move along the first direction X, so that the first battery cell 10 coated with glue steps into the curing station to promote the curing of the glue. When the second battery cell 10 is aligned with the glue printing screen 80 in the third direction Z, the glue printing screen 80 is pressed down again, and the second scraper 902 is pressed down and moved in the positive direction of the first direction X, so that the glue flows through the mesh 2 to the surface of the solder ribbon 20 and the second battery cell 10. The glue printing device performs a cyclic reciprocating motion according to the above steps to implement glue printing operations on the third battery cell 10, the fourth battery cell 10, and other more battery cells 10.

[0124] By providing the first scraper 901 and the second scraper 902 , the waiting time between two glue printing operations of the glue printing device is reduced, thereby improving the glue printing efficiency of the glue printing device.

[0125] like Figure 5 and Figure 6 As shown, the printing glue screen 80 includes an outer frame 40, a plate body 1, and meshes 2. The plate body 1 includes a connection area 11 and a printing glue area 12. Glue is applied to the surface of the printing glue area 12 facing away from the battery cell 10. The connection area 11 is disposed outside the printing glue area 12. The outer frame 40 is disposed at the edge of the connection area 11. The outer frame 40 and the edge of the connection area 11 are bonded and fixed by bonding glue 50. In the first direction X and the second direction Y, a portion of the bonding glue 50 is located between the outer frame 40 and the edge of the connection area 11. In the third direction Z, a portion of the bonding glue 50 overflows onto the surface of the connection area 11 facing away from the battery cell 10. Multiple meshes 2 are arranged along the first direction X to form a cell row 25. Multiple cell rows 25 are arranged along the second direction Y. Adjacent cell rows 25 are designated as first cell row 251 and second cell row 252. For example, the first cell row 251 is located above the first soldering strip, and the second cell row 252 is located above the second soldering strip.

[0126] like Figure 5As shown, the mesh 2 includes at least a first channel 21, a second channel 22 and a third channel 23. The first channel 21 corresponds to the first glue point 601 on the battery cell 10, the second channel 22 corresponds to the second glue point 602 on the battery cell 10, and the third channel 23 corresponds to the third glue point 603 on the battery cell 10. The distribution pattern of the first glue point 601, the second glue point 602 and the third glue point 603 is the same. Along the first direction X, the third channel 23 is located between the first channel 21 and the second channel 22, and multiple third channels 23 are arranged at intervals along the first direction X; the first channel 21 in the first unit row 251 is aligned with the first channel 21 in the second unit row 252 in the second direction Y, the second channel 22 in the first unit row 251 is aligned with the second channel 22 in the second unit row 252 in the second direction Y, and the third channel 23 in the first unit row 251 is staggered with the third channel 23 in the second unit row 252 in the first direction X.

[0127] The number of the third channels 23 in the first unit row 251 is 4 to 21, and / or the number of the third channels 23 in the second unit row 252 is 4 to 21.

[0128] like Figure 5 As shown, the printing screen 80 includes a central axis 4 extending along the first direction X, and a plurality of unit rows 25 are symmetrically distributed relative to the central axis 4. When the scraper 90 is pressed down, the plate body 1 is uniformly stressed on both sides in the second direction Y.

[0129] like Figure 5 As shown, the outer frame 40 includes a first part 401 and a second part 402. Along the first direction X, the first part 401 and the second part 402 are respectively located on both sides of the plate body 1, and the connecting area 11 includes a first area 111 and a second area 112. The first area 111 is bonded and fixed to the first part 401, and the second area 112 is bonded and fixed to the second part 402; along the first direction X, the first channel 21 is located on the side of the printing rubber area 12 close to the first part 401, the second channel 22 is located on the side of the printing rubber area 12 close to the second part 402, and the third channel 23 is located between the first channel 21 and the second channel 22. Multiple third channels 23 are arranged at intervals along the first direction X.

[0130] In one possible design, Figure 5As shown, the length of the first channel 21 in the first direction X is 6mm to 9mm, specifically 6mm, 6.1mm, 6.3mm, 6.5mm, 6.7mm, 6.9mm, 7mm, 7.1mm, 7.3mm, 7.5mm, 7.7mm, 7.9mm, 8mm, 8.1mm, 8.3mm, 8.5mm, 8.7mm, 8.9mm, 9mm, etc., and / or, the length of the second channel 22 in the first direction X is 6mm to 9mm, specifically 6mm, 6.1mm, 6.3mm, 6.5mm, 6.7mm, 6.9mm, 7mm, 7.1mm, 7.3mm, 7.5mm, 7.7mm, 7.9mm, 8mm, 8.1mm, 8.3mm, 8.5mm, 8.7mm, 8.9mm, 9mm, etc.

[0131] In another possible design, such as Figure 7As shown, the mesh 2 further includes a fourth channel 24. Along the first direction X, the fourth channel 24 is located on the side of the printing rubber area 12 close to the first portion 401. The fourth channel 24 is located between the first channel 21 and the second channel 22. The third channel 23 is located between the fourth channel 24 and the second channel 22. The length of the first channel 21 in the first direction X is 0.2 mm to 0.4 mm. The length of the first channel 21 in the first direction X can be 0.2 mm, 0.21 mm, 0.23 mm, 0.25 mm, 0.27 mm, 0.29 mm, 0.3mm, 0.31mm, 0.33mm, 0.35mm, 0.37mm, 0.39mm, 0.4mm, etc. The length of the fourth channel 24 in the first direction X is 0.2mm-0.4mm. The length of the fourth channel 24 in the first direction X can be 0.2mm, 0.21mm, 0.23mm, 0.25mm, 0.27mm, 0.29mm, 0.3mm, 0.31mm, 0.33mm, 0.35mm, 0.37mm, 0.39mm, 0.4mm, etc.; And / or, the mesh 2 further includes a fifth channel 26, along the first direction X, the fifth channel 26 is located on the side of the printing rubber area 12 close to the second portion 402, the fifth channel 26 is located between the first channel 21 and the second channel 22, the third channel 23 is located between the fifth channel 26 and the first channel 21, the length of the second channel 22 in the first direction X is 0.2mm to 0.4mm, and the length of the second channel 22 in the first direction X can be 0.2mm, 0.21mm, 0.23mm, 0.25mm, 0.27mm, 0.29mm , 0.3mm, 0.31mm, 0.33mm, 0.35mm, 0.37mm, 0.39mm, 0.4mm, etc., the length of the fifth channel 26 in the first direction X is 0.2mm~0.4mm, and the length of the fifth channel 26 in the first direction X can be 0.2mm, 0.21mm, 0.23mm, 0.25mm, 0.27mm, 0.29mm, 0.3mm, 0.31mm, 0.33mm, 0.35mm, 0.37mm, 0.39mm, 0.4mm, etc.

[0132] The size of the third channel 23 in the first direction X is 5mm to 20mm, and can be specifically 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, etc.

[0133] In any of the above embodiments, the width of the mesh 2 in the second direction Y is 1 mm to 1.4 mm, and can be specifically 1 mm, 1.01 mm, 1.03 mm, 1.05 mm, 1.07 mm, 1.09 mm, 1.1 mm, 1.11 mm, 1.13 mm, 1.15 mm, 1.17 mm, 1.19 mm, 1.2 mm, 1.21 mm, 1.23 mm, 1.25 mm, 1.27 mm, 1.29 mm, 1.3 mm, 1.31 mm, 1.33 mm, 1.35 mm, 1.37 mm, 1.39 mm, 1.4 mm, etc.

[0134] During the process of the glue printing device printing glue on the battery cell 10, since the distance between two adjacent battery cells 10 in the first direction X is small, taking the second battery cell 10 as an example, when the glue printing device performs the glue printing operation on the second battery cell 10, there is a risk that the glue printing screen 80 will abut against the first battery cell 10, and there is a risk that the uncured glue on the first battery cell 10 will adhere to the glue printing screen 80, resulting in a reduction in the amount of glue, that is, there is a risk of the glue printing screen 80 rubbing against the glue. At the same time, in the subsequent glue printing process, there is also a risk that the glue adhered to the glue printing screen 80 will abut against the battery cell 10, causing damage to the battery cell 10.

[0135] To this end, a raised portion may be provided on the plate 1 , the raised portion being used to abut against the battery cell 10 , and there being a certain height difference between the raised portion and the frame, thereby reducing the risk of the frame being scratched by the glue.

[0136] The protrusion has two structural forms. In one possible design, Figure 6 As shown, the board body 1 is sunken and bonded to the outer frame 40, that is, along the third direction Z, the bonding position of the board body 1 on the outer frame 40 is relatively low, so that a portion of the printed rubber area 12 protrudes from the outer frame 40 to form a raised portion. This structural form simplifies the structure of the board body 1, thereby helping to reduce the processing cost and difficulty of the board body 1. In another possible design, as Figure 9 and Figure 10 As shown, the board 1 includes a rib 13. Along the third direction Z, the rib 13 is located on the side of the adhesive printing area 12 near the battery cell 10. The mesh 2 extends through the adhesive printing area 12 and the rib 13, which is the aforementioned raised portion. The provision of the rib 13 to form the raised portion reduces the risk of adhesive rubbing against the adhesive printing screen 80 while ensuring that the third surface 121 of the adhesive printing area 12 and the first surface 401A and second surface 402A of the outer frame 40 are coplanar. This increases the bonding area between the board 1 and the outer frame 40, thereby improving the bonding stability and reliability between the board 1 and the outer frame 40.

[0137] When the plate 1 sinks and adheres to the outer frame 40, as shown in FIG. Figure 5 and Figure 6As shown, along the first direction X, on the side close to the first portion 401, the distance L1 between the first channel 21 and the edge of the rubber printing area 12 satisfies the following: 2mm≤L1≤7mm. For example, L1 is 2mm, 2.1mm, 2.3mm, 2.5mm, 2.7mm, 2.9mm, 3mm, 3.1mm, 3.3mm, 3.5mm, 3.7mm, 3.9mm, 4mm, 4.1mm, 4.3mm, 4.5mm, 4.7mm, 4.9mm, 5mm, 5.1mm, 5.3mm, 5.5mm, 5.7mm, 5.9mm, 6mm, 6.1mm, 6.3mm, 6.5mm, 6.7mm, 6.9mm, 7mm, etc. Figure 5 and Figure 6 As shown, along the first direction X, on the side close to the second portion 402, the distance L2 between the second channel 22 and the edge of the printing rubber area 12 satisfies: 2mm≤L2≤7mm. For example, L2 is 2mm, 2.1mm, 2.3mm, 2.5mm, 2.7mm, 2.9mm, 3mm, 3.1mm, 3.3mm, 3.5mm, 3.7mm, 3.9mm, 4mm, 4.1mm, 4.3mm, 4.5mm, 4.7mm, 4.9mm, 5mm, 5.1mm, 5.3mm, 5.5mm, 5.7mm, 5.9mm, 6mm, 6.1mm, 6.3mm, 6.5mm, 6.7mm, 6.9mm, 7mm, etc., or, as Figure 7 and Figure 8 As shown, 60mm≤L2≤65mm, for example, L2 is 60mm, 60.1mm, 60.3mm, 60.5mm, 60.7mm, 60.9mm, 61mm, 61.1mm, 61.3mm, 61.5mm, 61.7mm, 61.9mm, 62mm, 62.1mm, 62.3mm, 62.5mm, 62.7mm, 62.9mm, 63mm, 63.1mm, 63.3mm, 63.5mm, 63.7mm, 63.9mm, 64mm, 64.1mm, 64.3mm, 64.5mm, 64.7mm, 64.9mm, 65mm, etc.

[0138] If L1 is less than 2 mm, the distance between the mesh 2 and the edge of the adhesive printing area 12 is small, resulting in less deformation of the board 1 at this location. The required downward pressure of the scraper 90 is greater, which increases the difficulty of adjusting the downward pressure of the adhesive printing device. If L1 is greater than 7 mm, the distance between the mesh 2 and the edge of the adhesive printing area 12 is greater, which increases the risk of the third surface 121 contacting uncured glue on the adjacent solar cell 10. Therefore, 2 mm ≤ L1 ≤ 7 mm reduces the difficulty of adjusting the downward pressure of the adhesive printing device and reduces the risk of adhesive scraping on the third surface 121, thereby improving the processing yield of the photovoltaic module.

[0139] If 2mm≤L2≤7mm, the overall size of the board 1 in the first direction X is smaller, which is beneficial to reducing the material cost of the board 1. At the same time, L2 is smaller, which reduces the risk of the third surface 121 abutting against the adjacent battery cell 10 that has not yet been printed with glue, thereby reducing the risk of the third surface 121 damaging the battery cell 10 that has not yet been printed with glue, thereby improving the yield of the photovoltaic module.

[0140] If 60mm≤L2≤65mm, the downward pressure required by the scraper 90 at this point is reduced, thereby reducing the difficulty of debugging the downward pressure of the glue printing device. At the same time, the downward pressure of the scraper 90 is relatively small, which reduces the glue output at the outermost mesh 2 on the side close to the second part 402, and reduces the risk of a large amount of glue overflowing here, resulting in a large area of ​​the battery cell 10 being blocked, which is beneficial to improving the photoelectric conversion efficiency of the battery cell 10. In addition, after the scraper 90 passes through the last mesh 2, the moving distance of the scraper 90 in the first direction X is increased, reducing the risk of damage to the scraper 90 caused by the abutment between the scraper 90 and the outer frame 40, thereby improving the service life of the scraper 90 and the outer frame 40.

[0141] When 2mm≤L1≤7mm, in the plane enclosed by the first direction X and the third direction Z, the cross-sectional profile of the first portion 401 of the outer frame 40 is L-shaped, so that a avoidance area is formed on the side of the first portion 401 close to the scraper 90, reducing the risk of damage to the scraper 90 due to abutment with the first portion 401, thereby extending the service life of the scraper 90 and the outer frame 40.

[0142] When 2mm≤L2≤7mm, the cross-sectional profile of the second portion 402 of the outer frame 40 is L-shaped within the plane defined by the first direction X and the third direction Z. This creates an escape area on the side of the second portion 402 close to the scraper 90, reducing the risk of damage to the scraper 90 from contact with the second portion 402, thereby extending the service life of the scraper 90 and the outer frame 40. Specifically, when 2mm≤L1≤7mm and 2mm≤L2≤7mm, the size of the entire printing area 12 in the first direction X is 90mm-100mm, which is comparable to the size of the battery cell 10 in the first direction X.

[0143] When 60 mm ≤ L2 ≤ 65 mm, the cross-sectional profile of the second portion 402 of the outer frame 40 can be either rectangular or L-shaped within the plane defined by the first direction X and the third direction Z. The rectangular cross-sectional profile of the second portion 402 can reduce the difficulty and cost of manufacturing the outer frame 40. The L-shaped cross-sectional profile of the second portion 402 reduces the risk of damage to the scraper 90 due to contact with the second portion 402, thereby extending the service life of the scraper 90 and the outer frame 40. Specifically, when 2 mm ≤ L1 ≤ 7 mm and 60 mm ≤ L2 ≤ 65 mm, the dimension of the entire printing rubber area 12 in the first direction X is 140 mm to 145 mm.

[0144] In any of the above embodiments, Figure 11 As shown, the third surface 121 is covered with a hydrophobic coating 3. During the preparation of the plate 1, niobium pentoxide, silicon oxide, aluminum oxide and fluoride are enriched on the third surface 121 by magnetron sputtering using a vacuum furnace or other equipment to form a hydrophobic coating 3, thereby increasing the contact angle between the glue and the third surface 121. Compared with the BM coating formed by enriching fluoride on the third surface 121 by physical infiltration in the prior art, Figure 12 As shown, the surface roughness of the hydrophobic coating 3 formed by magnetron sputtering in the present application is low, thereby reducing the amount of glue residue on the third surface 121, so that the cleaning cycle of the third surface 121 is increased to 6h to 8h for cleaning, extending the cleaning cycle of the printing screen 80, thereby reducing the number of cleaning times, and further improving the printing efficiency of the printing device.

[0145] The thickness of the hydrophobic coating 3 is 80 nm to 120 nm, for example, 80 nm, 85 nm, 90 nm, 95 nm, 100 nm, 105 nm, 110 nm, 115 nm, 120 nm, etc., to reduce the preparation difficulty and material cost of the hydrophobic coating 3 .

[0146] When the plate body 1 is provided with ribs 13, the ribs 13 are used as raised portions. Figure 9 and Figure 10As shown, along the first direction X, on the side close to the first portion 401, the distance L1 between the mesh 2 and the edge of the printing rubber area 12 satisfies the following: 60mm≤L1≤65mm. For example, L1 is 60mm, 60.1mm, 60.3mm, 60.5mm, 60.7mm, 60.9mm, 61mm, 61.1mm, 61.3mm, 61.5mm, 61.7mm, 61.9mm, 62mm, 62.1mm, 62.3mm, 62.5mm, 62.7mm, 62.9mm, 63mm, 63.1mm, 63.3mm, 63.5mm, 63.7mm, 63.9mm, 64mm, 64.1mm, 64.3mm, 64.5mm, 64.7mm, 64.9mm, and 65mm. etc.; along the first direction X, on the side close to the second portion 402, the distance L2 between the mesh 2 and the edge of the printing rubber area 12 satisfies: 60mm≤L2≤65mm, for example, L2 is 60mm, 60.1mm, 60.3mm, 60.5mm, 60.7mm, 60.9mm, 61mm, 61.1mm, 61.3mm, 61.5mm, 61.7mm, 61.9mm, 62mm, 62.1mm, 62.3mm, 62.5mm, 62.7mm, 62.9mm, 63mm, 63.1mm, 63.3mm, 63.5mm, 63.7mm, 63.9mm, 64mm, 64.1mm, 64.3mm, 64.5mm, 64.7mm, 64.9mm, 65mm, etc.

[0147] 60mm≤L1≤65mm, 60mm≤L2≤65mm, which reduces the downward pressure required by the scraper 90 at the edge of the glue printing area 12, thereby reducing the difficulty of debugging the downward pressure of the glue printing device. At the same time, the downward pressure of the scraper 90 is relatively small, which reduces the glue output at the mesh 2 near the edge of the glue printing area 12, and reduces the risk of a large area of ​​​​the battery cell 10 being blocked due to a large amount of glue overflowing here, which is beneficial to improving the photoelectric conversion efficiency of the battery cell 10; in addition, in the first direction X, the movement space of the scraper 90 at the two side edges of the glue printing area 12 is increased, which reduces the risk of the scraper 90 being damaged due to the abutment with the outer frame 40, thereby improving the service life of the scraper 90 and the outer frame 40.

[0148] The surface of the rib 13 that contacts the battery cell 10 is the fourth surface 131. In one possible design, only the fourth surface 131 is covered with the hydrophobic coating 3 formed by the above-mentioned magnetron sputtering method, thereby reducing the amount of glue residue on the fourth surface 131, so that the cleaning cycle of the fourth surface 131 is increased to once every 6 hours to 8 hours, extending the cleaning cycle of the printing screen 80, thereby reducing the number of cleaning times, and further improving the printing efficiency of the printing device.

[0149] In another possible design, the third surface 121 and the fourth surface 131 are both provided with a hydrophobic coating 3 formed by the above-mentioned magnetron sputtering method, thereby reducing the residual amount of glue on the third surface 121 and the fourth surface 131, so that the cleaning cycle of the third surface 121 and the fourth surface 131 is increased to once every 6 hours to 8 hours, thereby extending the cleaning cycle of the printing screen 80, thereby reducing the number of cleaning times, and further improving the printing efficiency of the printing device.

[0150] In any of the above embodiments, the overall size of the printing rubber area 12 in the second direction Y is 300 mm to 400 mm, specifically 300 mm, 310 mm, 320 mm, 330 mm, 340 mm, 350 mm, 360 mm, 370 mm, 380 mm, 390 mm, 400 mm, etc.; in the second direction Y, the distance between the outermost mesh 2 and the edge of the printing rubber area 12 is 70 mm to 80 mm, specifically 71 mm, 72 mm, 73 mm, 74 mm, 75 mm, 76 mm, 77 mm, 78 mm, 79 mm, 80 mm, etc.

[0151] In one possible design, Figure 4 As shown, one printing screen 80 can print one solar cell 10 , that is, only one printing area 12 is provided on the printing screen 80 , so as to reduce the overall size of the printing screen 80 .

[0152] In another possible design, such as Figure 13 As shown, a printing screen 80 can cover at least two battery cells 10. Figure 14 As shown, the glue printing area 12 includes at least a third area 122 and a fourth area 123 distributed along the first direction X. The third area 122 and the fourth area 123 correspond to two adjacent battery cells 10 respectively. When the glue printing device performs the glue printing operation, within one glue printing stroke, the glue printing device can simultaneously print glue on two battery cells 10, so as to improve the glue printing efficiency of the glue printing device, thereby facilitating the coordinated use of the glue printing device and the high-speed welding machine.

[0153] Among them, the minimum distance S7 between the second channel 22 in the third area and the first channel 21 in the fourth area satisfies: 15mm≤S7≤25mm, and can be specifically 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, etc.

[0154] If S7 is less than 15mm, the strength of the board 1 between the second channel 22 in the third region and the first channel 21 in the fourth region is weak, risking damage to the board when the scraper 90 is pressed downward. If S7 is greater than 25mm, the overall size of the board 1 increases, thereby increasing the cost of the adhesive printing device and increasing the risk of the fourth region 123 shifting relative to the battery cell 10. Therefore, 15mm≤S7≤25mm improves the strength of the board 1, thereby extending the service life of the adhesive printing device and improving the accuracy of the relative positioning of the fourth region 123 and the battery cell 10.

[0155] A third aspect of the present application provides a process for printing glue for a photovoltaic module, wherein the photovoltaic module is any one of the photovoltaic modules described above, and the glue printing device is any one of the glue printing devices described above. The process for printing glue for a photovoltaic module includes:

[0156] Arrange multiple battery cells at intervals along a first direction X, and place welding ribbons on the battery cells;

[0157] Pre-welding the cells and ribbons at the welding points to form a pre-fixed cell string;

[0158] The pre-fixed battery string is placed on a glue printing device, which is any of the glue printing devices described above. The glue printing device prints glue on the surface where the pre-fixed battery string is placed to form the above-mentioned glue dots.

[0159] The step of printing glue on the surface of the pre-fixed battery string by the glue printing device to form the above-mentioned glue dots includes:

[0160] The pre-fixed battery string is placed on the substrate, and along the third direction Z, the pre-fixed battery string is located between the printing screen and the substrate; the printing screen is moved along the third direction Z so that the surface of the printing screen contacts the soldering ribbon;

[0161] The scraper moves along the third direction Z and contacts the surface of the printing screen facing away from the battery cell. Driven by the scraper, the printing screen is locally deformed in the direction toward the battery cell.

[0162] The scraper moves along the first direction X, and the glue flows through the mesh to the surface of the solder ribbon and the battery cell under the drive of the scraper;

[0163] After the scraper completes one printing stroke, the scraper and the printing screen move along the third direction Z away from the battery cell;

[0164] The pre-fixed battery string is stepped to a curing device to promote the curing of the glue to form glue points 60 .

[0165] When a printing glue screen 80 can cover at least two battery cells 10, the step of moving the scraper along the first direction X so that the glue flows through the mesh to the soldering ribbon and the battery cell surface under the drive of the scraper includes:

[0166] Along the first direction X, the scraper moves from the connection area to the third area and continues to move, and the glue flows through the mesh in the third area to the surface of the solder ribbon and the first battery cell;

[0167] Along the first direction X, the scraper moves from the third area to the fourth area and continues to move, and the glue flows through the mesh in the fourth area to the surface of the soldering ribbon and the second battery cell.

[0168] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic module includes a battery string (300), the battery string (300) includes a plurality of battery cells (10), a plurality of welding strips (20) and a plurality of glue points (60), adjacent battery cells (10) are electrically connected via the welding strips (20), the welding strips (20) extend along a first direction (X), a plurality of the welding strips (20) are arranged at intervals along a second direction (Y), a welding point (30) is provided on the battery cell (10), the battery cell (10) and the welding strip (20) are welded and fixed at the welding point (30), a part of at least one of the glue points (60) is located on the surface of the battery cell (10), and another part is located on the surface of the welding strip (20), so that the battery cell (10) and the welding strip (20) are bonded and fixed at the glue point (60), and a plurality of the glue points (60) are distributed along the first direction (X); The welding points (30) include a first welding point (301) and a second welding point (302); along the first direction (X), the first welding point (301) and the second welding point (302) are respectively located on two sides of the battery cell (10); at least part of the glue point (60) is located between the first welding point (301) and the second welding point (302); The welding strip (20) comprises at least a first welding strip and a second welding strip distributed along the second direction (Y), and at least part of the glue dots (60) on the first welding strip and at least part of the glue dots (60) on the second welding strip are staggered in the first direction (X); The glue dots (60) at least include a first glue dot (601), a second glue dot (602), and a third glue dot (603); along the first direction (X), the third glue dot (603) is located between the first glue dot (601) and the second glue dot (602); and a plurality of the third glue dots (603) are distributed at intervals; The glue dot (60) further includes a fourth glue dot (604), and along the first direction (X), the fourth glue dot (604) is located between the first glue dot (601) and the second glue dot (602), and the third glue dot (603) is located between the fourth glue dot (604) and the second glue dot (602); The length of the first glue dot (601) in the first direction (X) is 0.2 mm to 0.4 mm, the length of the fourth glue dot (604) in the first direction (X) is 0.2 mm to 0.4 mm, and the distance between the first glue dot (601) and the fourth glue dot (604) in the first direction (X) is 6 mm to 9 mm; And / or, the glue dot (60) further includes a fifth glue dot (605), and along the first direction (X), the fifth glue dot (605) is located between the first glue dot (601) and the second glue dot (602), and the third glue dot (603) is located between the first glue dot (601) and the fifth glue dot (605); The length of the second glue dot (602) in the first direction (X) is 0.2 mm to 0.4 mm, the length of the fifth glue dot (605) in the first direction (X) is 0.2 mm to 0.4 mm, and the distance between the second glue dot (602) and the fifth glue dot (605) in the first direction (X) is 6 mm to 9 mm.

2. The photovoltaic module according to claim 1, characterized in that The first welding points (301) on adjacent welding strips (20) are directly opposite in the second direction (Y); The second welding points (302) on the adjacent welding strips (20) are directly opposite in the second direction (Y).

3. The photovoltaic module according to claim 2, characterized in that In the first direction (X), the first glue point (601) is located on a side of the first welding point (301) away from the second welding point (302), or, the first glue point (601) is located between the first welding point (301) and the second welding point (302), or, in the third direction (Z), at least a portion of the first glue point (601) is located above the first welding point (301); and / or, In the first direction (X), the second glue point (602) is located on a side of the second soldering point (302) away from the first soldering point (301), or the second glue point (602) is located between the first soldering point (301) and the second soldering point (302), or, in the third direction (Z), at least a portion of the second glue point (602) is located above the second soldering point (302).

4. The photovoltaic module according to claim 3, characterized in that The first glue point (601) on the first soldering strip and the first glue point (601) on the second soldering strip are opposite in the second direction (Y), and / or the second glue point (602) on the first soldering strip and the second glue point (602) on the second soldering strip are opposite in the second direction (Y); The third glue point (603) on the first soldering strip and the third glue point (603) on the second soldering strip are arranged in a staggered manner in the first direction (X).

5. The photovoltaic module according to claim 4, characterized in that: Along the first direction (X), a plurality of the third glue dots (603) are evenly distributed between the first glue dots (601) and the second glue dots (602).

6. The photovoltaic module according to claim 4, characterized in that: The distribution number N1 of the third glue dots (603) in the first direction (X) satisfies: 4≤N1≤21.

7. The photovoltaic module according to any one of claims 2 to 6, characterized in that: Along the first direction (X), a distance S1 between the first welding point (301) and the edge of the battery cell (10) satisfies: 7 mm ≤ S1 ≤ 8 mm; Along the second direction (Y), a distance S2 between the first welding point (301) and the edge of the battery cell (10) satisfies: 7 mm ≤ S2 ≤ 8 mm; and / or, along the first direction (X), a distance S3 between the second welding point (302) and the edge of the battery cell (10) satisfies: 7 mm ≤ S3 ≤ 8 mm; Along the second direction (Y), a distance S4 between the second welding point (302) and the edge of the battery cell (10) satisfies: 7 mm ≤ S4 ≤ 8 mm.

8. The photovoltaic module according to any one of claims 3 to 6, characterized in that: Along the first direction (X), the first glue point (601) is located on a side of the first welding point (301) away from the second welding point (302), or the first glue point (601) is located between the first welding point (301) and the second welding point (302), and a distance S5 between the first glue point (601) and the first welding point (301) satisfies: 1mm≤S5≤2mm; And / or, along the first direction (X), the second glue point (602) is located on a side of the second welding point (302) away from the first welding point (301), or the second glue point (602) is located between the first welding point (301) and the second welding point (302), and a distance S6 between the second glue point (602) and the second welding point (302) satisfies: 1mm≤S6≤2mm.

9. The photovoltaic module according to any one of claims 2 to 6, characterized in that: The number N2 of the welding strips (20) in the second direction (Y) satisfies: 16≤N2≤14.

10. A process for printing glue for a photovoltaic module, wherein the photovoltaic module is the photovoltaic module according to any one of claims 1 to 9, characterized in that: The printing glue process of the photovoltaic module includes: Arranging a plurality of the battery cells (10) at intervals along the first direction (X), and placing the welding ribbon (20) on the battery cells (10); Pre-welding the battery cell (10) and the welding ribbon (20) at the welding point (30) to form a pre-fixed battery string; The pre-fixed battery string is placed on a glue printing device, and the glue printing device prints glue on the pre-fixed battery string to form the glue dots (60).

11. The photovoltaic module printing process according to claim 10, characterized in that: The glue printing device comprises a base (70), a glue printing screen (80) and a scraper (90), wherein the glue printing screen (80) is provided with mesh holes (2), and the side of the glue printing screen (80) facing the scraper (90) is covered with the glue; The step of the glue printing device printing glue on the battery sheet (10) to form the glue dots (60) comprises: Placing the pre-fixed battery string on the base (70), along a third direction (Z), the pre-fixed battery string (300) is located between the printing screen (80) and the base (70); The printing screen (80) moves along the third direction (Z) so that the surface of the printing screen (80) contacts the welding strip (20); The scraper (90) moves along the third direction (Z) and contacts the surface of the printing screen (80) facing away from the battery cell (10), and the printing screen (80) is locally deformed in the direction toward the battery cell (10) under the drive of the scraper (90); The scraper (90) moves along the first direction (X), and the glue flows through the mesh (2) to the surface of the soldering ribbon (20) and the battery cell (10) under the drive of the scraper (90); After the scraper (90) completes one printing stroke, the scraper (90) and the printing screen (80) move along the third direction (Z) in a direction away from the battery cell (10); The pre-fixed battery string (300) is stepped to a curing device to promote the curing of the glue.

12. The photovoltaic module printing glue process according to claim 11, characterized in that: The printing glue screen (80) comprises a plate body (1), the plate body (1) is provided with a connection area (11) and a printing glue area (12), the mesh (2) is provided in the printing glue area (12), the connection area (11) is provided outside the printing glue area (12), and the connection area (11) is connected to the base body (70); The printing rubber area (12) comprises at least a third area (122) and a fourth area (123), wherein the third area (122) and the fourth area (123) are arranged at intervals along the first direction (X); The battery cell (10) comprises a first battery cell (10) and a second battery cell (10) adjacent to each other along the first direction (X); The step of moving the scraper (90) along the first direction (X) so that the glue flows through the mesh (2) to the surface of the soldering ribbon (20) and the battery cell (10) under the drive of the scraper (90) comprises: Along the first direction (X), the scraper (90) moves from the connection area (11) to the third area (122) and continues to move, and the glue flows through the mesh (2) in the third area (122) to the surface of the welding ribbon (20) and the first battery cell (10); Along the first direction (X), the scraper (90) moves from the third area (122) to the fourth area (123) and continues to move, and the glue flows through the mesh (2) in the fourth area (123) to the surface of the welding strip (20) and the second battery cell (10).

13. The photovoltaic module printing glue process according to claim 12, characterized in that: A minimum distance S7 between the mesh (2) in the third area (122) and the mesh (2) in the fourth area (123) in the first direction (X) satisfies: 15 mm ≤ S7 ≤ 25 mm.

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