Photovoltaic welding strip, photovoltaic module production method, production equipment and photovoltaic module

Abstract

The invention discloses a photovoltaic welding strip, a photovoltaic module production method, production equipment and a photovoltaic module. The photovoltaic solder strip comprises a conductive substrate and a protective reflective layer, and is not provided with a solder layer for providing enough brazing materials for ensuring effective welding. Under the condition of the same conductivity, the photovoltaic solder strip is smaller in size and lower in cost, the proportion of the thickness of the adhesive film and the shading area caused by the solder layer with the conductivity basically negligible is lower, and the power generation efficiency of the photovoltaic module is improved while the material cost of the photovoltaic module is reduced. The problems that when the number of photovoltaic welding strips is increased and the size of the photovoltaic welding strips is reduced, the power generation efficiency is not obviously improved due to the fact that the proportion of the shading area is higher and higher caused by brazing materials, and the shapes and the performance of special-shaped welding strips such as triangular welding strips gradually tend to be the same as those of round welding strips are solved. And meanwhile, the lead-free property of the photovoltaic welding strip becomes possible.

Description

Technical Field

[0001] The present application belongs to the field of photovoltaic technology, and specifically relates to photovoltaic welding strips, photovoltaic module production methods, photovoltaic module production equipment and photovoltaic modules. Background Art

[0002] Photovoltaic welding strips are also called tin-coated copper strips, photovoltaic connecting wires, thin copper wires, conductive wires, etc. They mainly play the role of conducting electricity and connecting in photovoltaic modules. They are the main carriers for current collection and power output of photovoltaic cells and photovoltaic modules. The conductivity is its most critical performance indicator. The photovoltaic welding strips in the prior art mainly include a conductive substrate and a solder layer coated on the surface of the conductive substrate. Some special photovoltaic welding strips, including triangular conductive wires, reflective welding strips, black welding strips, etc., have a reflective layer, a black coating, etc. on the surface in addition to the solder layer. Among them, the conductive substrate is the main part of the photovoltaic welding strip for conductivity, and the solder layer is mainly used as a brazing material to achieve effective welding between the photovoltaic welding strip and the photovoltaic cell and between the photovoltaic welding strip and the photovoltaic welding strip. It also has a reflective and protective effect. It can not only reflect light, but also prevent the conductive substrate from being exposed to the air and causing oxidation and corrosion. The reflective layer and the black coating are mainly coated on the surface of the solder layer or directly coated on the conductive substrate to play a reflective and beautiful role. The solder layer as the brazing material must have sufficient thickness to ensure the welding quality. If the solder layer is too thin, the brazing material will be insufficient, which will cause the welding quality to fail to meet the requirements. Therefore, the existing photovoltaic welding tape technical specifications have corresponding requirements for the thickness of the solder layer. For example, the average thickness of the single side of the flat welding tape solder layer is generally not less than 20um, and the typical value is 25um. The average thickness of the single side of the round welding tape solder layer is generally not less than 12um, and the typical value is 15um. However, the most widely used photovoltaic welding tape solder layer material is Sn60Pb40 tin-lead alloy, and its resistivity and price are much higher than oxygen-free copper as a conductive substrate. Although a sufficiently thick solder layer can ensure the welding quality, it will greatly increase the material cost of the photovoltaic welding tape, but it will hardly contribute to the most critical conductivity of the photovoltaic welding tape. At the same time, because the solder layer increases the size of the photovoltaic welding tape, it also increases the shading area of ​​the photovoltaic welding tape and the thickness of the encapsulation film, which will reduce the power generation efficiency of the photovoltaic module and increase the material cost of the photovoltaic module. With the continuous development of photovoltaic technology from MBB to SMBB and 0BB, reducing the size of photovoltaic ribbons and increasing the number of photovoltaic ribbons have become one of the main technical paths for reducing costs and increasing efficiency of photovoltaic modules. However, in the process of reducing the size of photovoltaic ribbons, the solder layer as a brazing material cannot be too thin, which causes the proportion of solder layer in photovoltaic ribbons to increase. In other words, the material cost caused by the solder layer, which has a basically negligible contribution to the conductivity of the photovoltaic ribbon, and the proportion of the thickness of the packaging film and the shading area are increasing. It can be seen that with the increase in the number of photovoltaic ribbons and the decrease in size, the solder layer not only causes higher and higher material costs, but also has an increasingly negative impact on the power generation efficiency of photovoltaic modules.This also leads to the fact that in the process of increasing the number of photovoltaic ribbons and reducing the size of photovoltaic ribbons, the improvement of photovoltaic module power generation efficiency is very obvious in the initial stage, but when the number of photovoltaic ribbons continues to increase and the size of photovoltaic ribbons is reduced, the improvement of photovoltaic module power generation efficiency becomes smaller and smaller, thus limiting the sustainability of improving photovoltaic module power generation efficiency by further reducing the size of photovoltaic ribbons and increasing the number of photovoltaic ribbons. On the other hand, special-shaped ribbons, including triangular ribbons, trapezoidal ribbons, etc., have a significant advantage in improving photovoltaic module power generation efficiency because they have a larger welding and conductive area and better reflective performance than circular ribbons. However, because the solder layer must have a certain thickness, the surface tension of the solder layer when it melts during tin coating or welding makes its cross-section arc-shaped. As the size of photovoltaic ribbons decreases, the influence of this arc becomes greater and greater, making the appearance and performance of special-shaped ribbons such as triangular ribbons gradually converge with those of circular ribbons, thus failing to give full play to the performance advantages of special-shaped ribbons such as triangular ribbons in welding, conductive area, and reflective ability. Although some new special-shaped photovoltaic welding strips, such as stacked grid thin triangular conductive wires, use different production processes for the reflective surface and the welding surface, and only plate a thin reflective layer on the reflective surface, and only plate a certain thickness of solder layer on the welding surface. Although this can continue to maintain the performance advantages of special-shaped welding strips such as triangular welding strips when the size of the photovoltaic welding strip becomes smaller, because the reflective layer and solder layer of the photovoltaic welding strip need to be processed twice, its production process is complicated and the productivity is not high. For black welding strips, if the black coating is applied on the surface of the solder layer, if the welding time is too long, the welding temperature is too high, or the welding pressure is too high during the welding process, the solder layer under the black coating may melt, which may easily cause the black coating to deform or even break, affecting the appearance. If the black coating is directly applied to the surface of the conductive substrate, not only is the production process complicated, but the density, reliability, and life of the black coating are also inferior to the solder layer, and the protective effect on the conductive substrate will be correspondingly worse. Moreover, for a long time, because the working environment of photovoltaic modules is outdoor, in order to prevent the occurrence of tin epidemic, the solder layer of photovoltaic ribbons is basically made of lead-containing tin-lead alloy, which makes it impossible for photovoltaic ribbons to be lead-free, posing certain environmental risks. In summary, the technical solution of providing sufficient solder required to ensure welding quality by the solder layer of photovoltaic ribbons has become an increasingly greater constraint and unfavorable factor in the development of photovoltaic technology, especially in the process of photovoltaic ribbons becoming smaller and smaller in size. Summary of the invention

[0003] The purpose of this application is to provide a photovoltaic welding strip and a photovoltaic module production method, photovoltaic module production equipment and photovoltaic module to overcome the deficiencies of the above-mentioned prior art. In order to solve the above problems, this application is implemented as follows: In the first aspect, the present application proposes a photovoltaic welding strip, comprising a conductive substrate and a protective reflective layer located on the surface of the conductive substrate. The conductive substrate is located at the center of the photovoltaic welding strip, and mainly plays the role of conduction and physical connection. The protective reflective layer is located on the entire outer surface of the conductive substrate except for the two ends, and mainly plays the role of protection and reflection. The essential difference from the photovoltaic welding strip in the prior art is that the photovoltaic welding strip does not provide a solder layer with sufficient brazing material for effective welding. In the production process of photovoltaic modules, external brazing material is required to achieve effective welding, so the thickness of the protective reflective layer can be lower than the thickness requirement of the solder layer of the photovoltaic welding strip in the prior art, and can be as thin as possible according to needs and the production process adopted.

[0004] Furthermore, the thickness of the protective reflective layer is 0.01-5 um.

[0005] By adopting the above preferred solution, the currently existing hot-dip photovoltaic welding strip production equipment can continue to be used, achieving a good balance between technical advantages and production costs.

[0006] Furthermore, the thickness of the protective reflective layer is 0.01-1.5 um.

[0007] By adopting the above-mentioned preferred scheme, production processes such as electroplating, vacuum evaporation, and magnetron sputtering can be used to make the thickness of the photovoltaic welding ribbon protective reflective layer thinner, so as to give full play to the technical advantages of the photovoltaic welding ribbon.

[0008] Furthermore, the conductive substrate can be made of oxygen-free copper, copper-clad aluminum, copper-clad graphene, graphene-metal composite material, graphene, and the like.

[0009] Furthermore, the cross-section of the conductive substrate as a whole or in segments can be circular, elliptical, rectangular, square, triangular, trapezoidal, irregular polygonal or a combination of the above different shapes in parts, thereby preparing a photovoltaic welding strip whose whole or segmented shapes are circular, elliptical, rectangular, square, triangular, trapezoidal, irregular polygonal or a combination of the above different shapes in parts.

[0010] Furthermore, the material of the protective reflective layer can be tin, lead, bismuth, indium, copper, aluminum, zinc, chromium, silver, graphene, or an alloy, mixture or composite material of two or more of tin, lead, bismuth, indium, copper, aluminum, zinc, chromium, silver, and graphene.

[0011] Furthermore, the material of the protective reflective layer may be an antioxidant, a passivator, or a mixture of an antioxidant, a passivator and other materials.

[0012] Compared with the prior art, the negative impact of the photovoltaic welding ribbon protective reflective layer on the photovoltaic welding ribbon material cost, light shielding, film thickness, and the appearance of special-shaped welding ribbons such as triangular welding ribbons, the welding of black welding ribbons, and the protection of the conductive substrate of black welding ribbons can be basically ignored. In addition, because the protective reflective layer is no longer used as a soldering material, tin-lead alloy can be omitted, making lead-free photovoltaic welding ribbons possible.

[0013] Secondly, the present application proposes a method for producing photovoltaic modules, including the production steps of laying photovoltaic welding ribbons, placing solar cells, welding (or simultaneously achieving welding in other production steps), lamination, framing, etc. The essential difference from the prior art is that the production method also includes a production step of applying solder, and when the photovoltaic welding ribbon has no solder layer, external solder is used to achieve effective welding.

[0014] Furthermore, the applying of solder is to apply solder to the welding position on the surface of photovoltaic cell or photovoltaic ribbon when the photovoltaic cell and photovoltaic ribbon are placed independently of each other, or to apply solder to the welding position between photovoltaic cell and photovoltaic ribbon or between photovoltaic ribbon and photovoltaic ribbon when the photovoltaic ribbon is located at or close to the surface of photovoltaic cell and the photovoltaic ribbon is located at or close to the surface of photovoltaic ribbon.

[0015] Furthermore, the applying of the solder is applying a paste solder at room temperature, or applying a liquid solder that has been heated and melted.

[0016] Compared with the prior art, applying solder enables effective welding between the photovoltaic ribbon and the photovoltaic cell sheet and between the photovoltaic ribbons when the photovoltaic ribbon has no solder layer.

[0017] On the third aspect, the present application proposes a photovoltaic module production equipment, including a base, a photovoltaic cell placement device, a photovoltaic welding tape laying device, and a welding device (or welding is achieved using other devices). The essential difference from the prior art is that the production equipment also includes a brazing material applying device, and when the photovoltaic welding tape has no solder layer, external brazing material is used to achieve effective welding.

[0018] Furthermore, the solder applying device is a solder screen printing device, including a screen printing plate and a scraper, which can print the solder to the set welding position. Or the solder applying device is a solder filling device, including a filling pipe, a valve and a solder loading container. One end of the filling pipe is placed at the welding position where the solder needs to be filled, and the other end is connected to the pressurized solder loading container. There is a valve on the filling pipe, and when the valve is opened, the solder can be filled to the set welding position.

[0019] In a fourth aspect, the present application proposes a photovoltaic module, including a photovoltaic cell string, a film, glass, a frame, etc. The essential difference from the prior art is that the photovoltaic cell string is composed of two or more photovoltaic cells connected by the photovoltaic welding ribbon as described above, or the photovoltaic module production method or photovoltaic module production equipment as described above is used in the production process. A photovoltaic cell string or multiple photovoltaic cell strings are connected in series or in parallel, and then the photovoltaic cell string is covered with a film, glass, etc. and laminated, and then a frame, a junction box, etc. are installed, which together constitute the photovoltaic module.

[0020] Compared with the prior art, this application has the following obvious advantages: 1. Under the condition of the same conductivity, the photovoltaic welding ribbon is smaller in size, the material cost is lower, and the shading is less, and the encapsulation film is thinner, which improves the power generation efficiency of photovoltaic modules and reduces the material cost of photovoltaic modules; 2. It has solved the technical bottleneck that when the number of photovoltaic welding ribbons is increased and the size of photovoltaic welding ribbons is reduced, the effective conductive area of ​​the photovoltaic welding ribbons accounts for a smaller and smaller proportion, while the shading area of ​​the solder, whose contribution to the conductivity is basically negligible, accounts for a larger and larger proportion. This makes it possible to improve the power generation efficiency of photovoltaic modules by further increasing the number of photovoltaic welding ribbons and reducing the size of photovoltaic welding ribbons; 3. When the size of the photovoltaic welding ribbon is further reduced, it is possible to continue to use special-shaped welding ribbons such as triangular welding ribbons to improve the power generation efficiency of photovoltaic modules; 4. Reduce the production cost of special welding strips such as black welding strips, and ensure long-term protection of the conductive substrate; 5. Make lead-free photovoltaic ribbon possible; BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a cross-sectional view of an embodiment of a photovoltaic welding ribbon of the present application; Figure 2 is a cross-sectional view of another photovoltaic welding ribbon embodiment of the present application; Figure 3 It is a schematic diagram of a process of an embodiment of a photovoltaic module production method of the present application; Figure 4 It is a schematic diagram of the process of another photovoltaic module production method embodiment of the present application; Figure 5 It is a structural schematic diagram of an embodiment of a solder screen printing device of the present application; Figure 6 It is a structural schematic diagram of an embodiment of a brazing material filling device of the present application; Figure 7 It is a structural schematic diagram of an embodiment of a photovoltaic module production equipment of the present application; Figure 8 It is a structural schematic diagram of another photovoltaic module production equipment embodiment of the present application; Fig. 9 It is a structural schematic diagram of a photovoltaic component embodiment of the present application.

[0023] The parts in the figure are: 1. photovoltaic welding ribbon, 2. conductive substrate, 3. protective reflective layer, 4. black coating, 5. photovoltaic cell, 6. solder screen printing device, 7. screen printing plate, 8. scraper, 9. solder, 10. solder filling device, 11. filling pipe, 12. valve, 13. compressed gas, 14. solder loading container, 15. base, 16. photovoltaic cell placement device, 17. photovoltaic welding ribbon laying device, 18. welding device, 19. photovoltaic cell string, 20. frame, 21. photovoltaic module. DETAILED DESCRIPTION

[0024] The specific implementation of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without paying creative work belong to the protection scope of the present application.

[0025] exist Figure 1 In the photovoltaic welding strip embodiment shown, the photovoltaic welding strip is a circular photovoltaic welding strip, including a conductive substrate 2 and a protective reflective layer 3. The conductive substrate 2 is a copper wire with a circular cross-section made by drawing and annealing an oxygen-free copper rod, and the protective reflective layer 3 is a layer of Sn60Pb40 tin-lead alloy with a thickness of 0.01-1.5um plated on the surface of the conductor substrate 2 by an electroplating process. The conductive substrate 2 has good electrical conductivity and is a key part of the conduction of the photovoltaic welding strip. The protective reflective layer 3 not only has a reflective function, but also can protect the conductive substrate 2, prevent the conductive substrate 2 from being oxidized and corroded, and affect its welding and conductive properties. Because the photovoltaic welding strip has no solder layer, the protective reflective layer 3 does not provide enough solder required for effective welding. The photovoltaic welding strip needs to use external solder to achieve effective welding during use.

[0026] exist Figure 2In the photovoltaic welding belt embodiment shown, the photovoltaic welding belt is a black photovoltaic welding belt, including a conductive substrate 2, a protective reflective layer 3 and a black coating 4. The conductive substrate 2 is a wire with a rectangular cross section made of oxygen-free copper through wire drawing, rolling and annealing. The protective reflective layer 3 is a layer of Sn60Pb40 tin-lead alloy coating with a thickness of no more than 5um plated on the surface of the conductive substrate 2 by hot dip plating. The black coating 4 is formed by coating the protective reflective layer 3 on the outward side of the photovoltaic welding belt after the protective reflective layer 3 is coated. The conductive substrate 2 has good electrical conductivity and is a key part of the conduction of the photovoltaic welding belt. The protective reflective layer 3 mainly plays a protective role, protecting the conductive substrate 2, preventing the conductive substrate 2 from being oxidized and corroded, and affecting its welding and conductive properties. The black coating 4 mainly plays an aesthetic role. Such a black welding belt has a simple production process and low production cost, and because the protective reflective layer 3 under the black coating 4 is very thin, it is not easy to cause the black coating 4 to deform or even break during the welding process. Moreover, the protective reflective layer 3 has better compactness, reliability and lifespan than the black coating 4 , and thus can provide long-term and effective protection for the conductive substrate 2 .

[0027] exist Figure 3 The photovoltaic module production method embodiment shown includes the following production steps: S101: Placing photovoltaic cells: placing photovoltaic cells at a set position; S102: applying solder: printing solder paste as solder on the soldering position on the surface of the photovoltaic cell using a solder screen printing device; S103: Laying photovoltaic welding tape: Laying the photovoltaic welding tape on the soldering material on the surface of the photovoltaic cell; S104: Soldering: heating to melt the solder paste and soldering the photovoltaic ribbon to the surface of the photovoltaic cell; S105: Lamination: After welding, the photovoltaic cell string is transported to the corresponding station by the conveying device, and after being connected in series or parallel, it is laminated with the film, glass, etc.; S106: Framing: The laminated photovoltaic module structure is conveyed to the framing station by the conveying device, and the frame and junction box are installed to complete the production of the photovoltaic module.

[0028] exist Figure 4 The photovoltaic module production method embodiment shown includes the following production steps: S201: Laying the photovoltaic welding tape: Laying the photovoltaic welding tape to a set position; S202: Placing the photovoltaic cell: placing the photovoltaic cell at a corresponding position so that the photovoltaic welding strip is located at a welding position on the surface of the photovoltaic cell; S203: Applying solder + welding: Use a solder filling device to fill the heated and melted liquid lead-tin alloy solder into the welding part between the photovoltaic cell and the photovoltaic welding strip. Because the solder has been heated and melted, the welding between the photovoltaic cell and the photovoltaic welding strip can be completed at the same time as the solder is applied; S204: Lamination: After the welding is completed, the photovoltaic cell string is conveyed to the corresponding station by the conveying device, and after being connected in series or in parallel, it is laminated with the film, glass, etc.; S205: Framing: The laminated photovoltaic module structure is conveyed to the framing station by the conveying device, and the frame and junction box are installed to complete the production of the photovoltaic module.

[0029] exist Figure 5 In the solder screen printing device embodiment shown, the solder screen printing device comprises a screen printing plate 7 and a scraper 8. The scraper 8 prints the solder 9 through the mesh holes on the screen printing plate 7 to the welding position on the surface of the photovoltaic cell 5 in the process of moving from one side of the photovoltaic cell 5 to the other side of the photovoltaic cell 5.

[0030] exist Figure 6 In the embodiment of the solder filling device shown, the solder filling device includes a filling pipe 11, a valve 12 and a solder loading container 14. One end of the filling pipe 11 is placed at the welding position where the solder needs to be filled, and the other end of the filling pipe 11 is connected to the solder loading container 14 pressurized by compressed gas 13. The valve 12 is located on the filling pipe 11, and when the valve 12 is opened, the paste or heated and melted liquid solder can be filled into the set welding position through the filling pipe 11. The solder filling device is suitable for filling the solder into the welding position on the surface of the photovoltaic cell and the photovoltaic welding strip, and is also suitable for filling the solder into the welding position between the photovoltaic cell and the photovoltaic welding strip, and between the photovoltaic welding strip and the photovoltaic welding strip.

[0031] exist Figure 7In the embodiment of the photovoltaic module production equipment shown, the photovoltaic module production equipment includes a base 15, a photovoltaic cell placement device 16, a solder screen printing device 6, a photovoltaic welding tape laying device 17, and a welding device 18. During the production process, the photovoltaic cell is first placed at a set position by the photovoltaic cell placement device 16, and then the solder screen printing device 6 prints the solder paste as the solder to the welding position on the surface of the photovoltaic cell, and then the photovoltaic welding tape laying device 17 lays the photovoltaic welding tape on the solder on the surface of the photovoltaic cell, and then the welding device 18 performs welding to complete the production of the photovoltaic cell string. The photovoltaic cell string after welding is conveyed to the laminating device by the conveying device, and the photovoltaic cell string is connected in series or in parallel, and is laminated with the film, glass, etc. by the laminating device. After the lamination is completed, the photovoltaic module structure enters the framing station, and the framing equipment installs the frame and the junction box, etc. to complete the production of the photovoltaic module.

[0032] exist Figure 8 In the embodiment of the photovoltaic module production equipment shown, the photovoltaic module production equipment includes a base 15, a photovoltaic welding tape laying device 17, a photovoltaic cell placement device 16, and a brazing material filling device 10. During the production process, the photovoltaic welding tape laying device 17 first lays the photovoltaic welding tape to the set position, and then the photovoltaic cell is placed to the set position by the photovoltaic cell placement device 16, and the brazing material filling device 10 fills the heated and molten liquid tin-lead alloy brazing material into the welding part between the photovoltaic cell and the photovoltaic welding tape. Because the brazing material has been heated and melted, the welding can be completed while applying the brazing material, and the production of the photovoltaic cell string is completed. The photovoltaic cell string after welding is conveyed to the laminating equipment by the conveying device, and the photovoltaic cell string is connected in series or in parallel, and is laminated by the laminating equipment after being laminated with adhesive film, glass, etc. After the lamination is completed, the photovoltaic module structure enters the framing station, and the framing equipment installs the frame and junction box, etc., to complete the production of the photovoltaic module.

[0033] exist Fig. 9 In the photovoltaic module embodiment shown, two or more photovoltaic cells 5 use the photovoltaic welding strip 1 and Figure 4 The photovoltaic module production method, Figure 8 The photovoltaic module production equipment produces photovoltaic cell strings 19 by laying photovoltaic welding strips, placing photovoltaic cells, applying solder and welding. Multiple photovoltaic cell strings 19 are connected in series and in parallel, laminated with adhesive films, glass, etc., and then laminated and framed to form photovoltaic modules 21.

Claims

1. A photovoltaic welding ribbon, characterized in that: It comprises a conductive substrate (2) and a protective reflective layer (3) located on the surface of the conductive substrate (2), wherein the conductive substrate (2) is located at the center of the photovoltaic welding strip, and the protective reflective layer (3) is located on the entire outer surface of the conductive substrate (2) except for the two ends.

2. A photovoltaic welding strip according to claim 1, characterized in that: The protective reflective layer (3) has a thickness of 0.01-5 μm.

3. A photovoltaic welding strip according to claim 1, characterized in that: The protective reflective layer (3) has a thickness of 0.01-1.5 um.

4. A photovoltaic welding strip according to claim 1, 2 or 3, characterized in that: The material of the protective reflective layer (3) is tin, lead, bismuth, indium, copper, aluminum, zinc, chromium, silver, graphene, or an alloy, mixture or composite material of two or more of tin, lead, bismuth, indium, copper, aluminum, zinc, chromium, silver and graphene.

5. A photovoltaic welding strip according to claim 1, 2 or 3, characterized in that: The material of the protective reflective layer (3) is an antioxidant, a passivator, or a mixture of an antioxidant, a passivator and other materials.

6. A photovoltaic welding strip according to claim 1, 2, 3, 4 or 5, characterized in that: It also comprises a black coating (4), wherein the black coating (4) is coated on the protective reflective layer (3) on the outward side of the photovoltaic welding strip.

7. A method for producing photovoltaic modules, comprising the steps of laying photovoltaic ribbons, placing cells, welding (or simultaneously performing welding in other production steps), laminating, and framing, characterized in that: The production step of applying the brazing material is also included.

8. A photovoltaic module production method according to claim 7, characterized in that: The brazing material is applied at the welding position of the photovoltaic cell (5) or the photovoltaic welding strip (1) when the photovoltaic cell (5) and the photovoltaic welding strip (1) are placed independently of each other, or the brazing material (9) is applied at the welding position between the photovoltaic cell (5) and the photovoltaic welding strip (1) or between the photovoltaic welding strip (1) and the photovoltaic welding strip (1) when the photovoltaic welding strip (1) is located at or close to the surface of the photovoltaic cell (5) and the photovoltaic welding strip (1) is located at or close to the surface of the photovoltaic welding strip (1).

9. A photovoltaic module production method according to claim 7 or 8, characterized in that: The solder (9) is a paste solder at room temperature or a liquid solder that has been heated and melted.

10. A photovoltaic module production device, comprising a base (15), a photovoltaic cell placement device (16), a photovoltaic welding tape laying device (17), and a welding device (18) (or other devices are used to achieve welding), characterized in that: A brazing material application device is also included.

11. The photovoltaic module production equipment according to claim 10, characterized in that: The solder applying device is a solder screen printing device, comprising a screen printing plate (7) and a scraper (8), or a solder filling device, comprising a filling pipe (11), a valve (12) and a solder loading container (14), wherein one end of the filling pipe (11) is placed at a welding position to be filled with solder, and the other end is connected to a pressurized solder loading container (14), and the filling pipe (11) is provided with a valve (12).

12. A photovoltaic module, comprising a photovoltaic cell string (19), an adhesive film, glass, and a frame (20), characterized in that: The cell string (19) comprises two or more photovoltaic cells (5) and the photovoltaic welding strip (1) described in claim 1, 2, 3, 4, 5 or 6, and is formed by connecting the photovoltaic welding strip (1), or the photovoltaic module production method described in claim 7, 8 or 9, or the photovoltaic module production equipment described in claim 10 or 11 is used in production.

Images