Welding device for welding strip of photovoltaic module

Abstract

The utility model relates to a welding device for a welding strip of a photovoltaic module. The welding device comprises a transmission mechanism, a heating plate and a heating cover mechanism, the conveying mechanism is used for conveying a to-be-welded assembly comprising a battery piece and a welding strip. The heating plate is arranged below the portion, used for containing the to-be-welded assembly, of the conveying mechanism. The heating cover mechanism is arranged above the portion, used for containing the to-be-welded assembly, of the conveying mechanism. The heating cover mechanism comprises a cover body and a heating part. An opening of the cover body faces the heating plate, and the heating component is arranged in the cover body. The relatively-closed heating cavity is formed between the cover body and the heating plate, the temperature in the heating cavity is relatively uniform and stable, the upper portion and the lower portion of a to-be-welded assembly are heated, the heating uniformity degree of glue on the upper surface and the lower surface of a battery piece can be improved, and the curing speed of the battery piece is consistent; and the situation that the battery piece warps due to the fact that the difference between the curing rates of glue on the upper surface and the lower surface of the battery piece is too large is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic, in particular to a welding device for welding tapes of photovoltaic modules. Background Art

[0002] In a photovoltaic module, a plurality of solar cells are connected in series through welding tapes. Figure 1 The production process of the 0BB welding process is shown. Combining Figure 1 and Figure 2 As shown, in this process, thermosetting glue is printed on both sides of a solar cell 11 with grid lines distributed on its surface, and a welding tape 12 coated with a flux coating is placed on adjacent solar cells to obtain a component 10 to be welded. Then, the component 10 to be welded is heated, so that the thermosetting glue is cured, and the welding tape 12 is welded to the grid lines on the solar cell 11. During the heat treatment process, due to the large difference in the heating rate between the upper and lower sides of the solar cell 11, the curing rate of the glue on both sides of the solar cell 11 is quite different, which easily causes the solar cell 11 to warp. Summary of the Utility Model

[0003] Based on this, it is necessary to provide a welding device for welding tapes of photovoltaic modules to solve the problem that the curing rate of the glue on both sides of the solar cell is quite different, which easily causes the solar cell to warp.

[0004] The solution of the utility model is as follows:

[0005] A welding device for welding tapes of photovoltaic modules, comprising:

[0006] A transmission mechanism for transmitting a component to be welded including a solar cell and a welding tape;

[0007] A heating plate disposed below the portion of the transmission mechanism for placing the component to be welded, the heating plate being used for heating the component to be welded; and

[0008] A heating cover mechanism disposed above the portion of the transmission mechanism for placing the component to be welded, the heating cover mechanism including a cover body and a heating component, the heating component being disposed in the cover body for heating the component to be welded, an opening of the cover body facing the heating plate, and the cover body and the heating plate cooperating to form a heating cavity.

[0009] In one embodiment, a plurality of fixing stations for placing solar cells are disposed on the transmission mechanism, the plurality of fixing stations being arranged along the transmission direction of the transmission mechanism, and the cover body covering at least 3 of the fixing stations.

[0010] In one embodiment, the cover body covers 5 to 20 of the fixing stations.

[0011] In one embodiment, in the conveying direction of the conveying mechanism, the length of the heating cavity is 0.4 m to 1.5 m.

[0012] In one embodiment, the heating component includes a plurality of heating lamps distributed in the cover body.

[0013] In one embodiment, the heating lamp is a strip-shaped lamp whose extending direction is parallel to the conveying direction of the conveying mechanism, and the arrangement direction of the plurality of heating lamps is perpendicular to the conveying direction of the conveying mechanism.

[0014] In one embodiment, the distance between adjacent heating lamps is 30 mm to 60 mm.

[0015] In one embodiment, the distance between the lower end of the cover body and the heating plate is 20 mm to 40 mm.

[0016] In one embodiment, the conveying mechanism includes a conveyor belt, and the heating plate is located below and close to the conveying surface of the conveyor belt.

[0017] In one embodiment, the heating cover mechanism further includes a temperature detection component and a heating control component. The temperature detection component is used to detect the temperature in the heating cavity. The heating control component is electrically connected to the heating component, and the heating control component is used to adjust the power or efficiency of the heating component according to the temperature detected by the temperature detection component.

[0018] Compared with the traditional technology, the above-mentioned photovoltaic module solder ribbon welding device has the following beneficial effects:

[0019] The above-mentioned photovoltaic module solder ribbon welding device can be applied to the 0BB welding process. The components to be welded are conveyed through the conveying mechanism, and the battery cells and the solder ribbons thereon successively pass through the heating cavity. In the heating cavity, under the combined heat treatment of the heating plate below and the heating cover mechanism above, while the battery cells are welded, the glue is also cured. The heating cover mechanism includes a cover body and a heating component arranged in the cover body. A relatively airtight heating cavity is formed between the cover body and the heating plate, and the temperature inside the space is relatively uniform and stable. The components to be welded are heated from both above and below, which can improve the uniform heating degree of the glue on the upper and lower surfaces of the battery cells, make the curing speed more consistent, and reduce the occurrence of warping of the battery cells caused by too large a difference in the curing rates of the glue on the upper and lower surfaces of the battery cells.

[0020] Furthermore, in the above-mentioned solder ribbon welding device for photovoltaic modules, the cover body covers at least 3 of the above-mentioned fixed stations, allowing more than 3 solar cells to be welded simultaneously. Without reducing the transmission speed of the transmission mechanism and thus the production efficiency, the time for the solar cells to pass through the heating chamber is relatively long, that is, the welding time is relatively long. On this basis, the temperature in the heating chamber can be set relatively low. For example, the temperature in the heating chamber is slightly higher than the melting point of the solder ribbon coating. Through long-term welding, it can ensure that the solder ribbon coating is fully melted and makes full contact with the grid lines to achieve welding. The relatively low-temperature welding method can avoid damage to the solar cells caused by high temperature, such as over-welding problems caused by high temperature. Description of the Drawings

[0021] Figure 1 It is a schematic flow chart of the 0BB process;

[0022] Figure 2 It is a schematic structural diagram of the component to be welded;

[0023] Figure 3 It is a schematic structural diagram of the solder ribbon welding device for photovoltaic modules according to an embodiment of the present invention.

[0024] Description of the Reference Numerals:

[0025] 10. Component to be welded; 11. Solar cell; 12. Solder ribbon; 100. Solder ribbon welding device for photovoltaic modules; 110. Transmission mechanism; 120. Heating plate; 130. Heating cover mechanism; 131. Cover body; 132. Heating component. Detailed Embodiments

[0026] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art belonging to the technical field of the present application. The terms used in the description of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0028] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. These terms are only used for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0030] In the present application, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0031] As Figure 3 shown, a solder ribbon welding device 100 for a photovoltaic module according to an embodiment of the present utility model includes a transmission mechanism 110, a heating plate 120, and a heating hood mechanism 130.

[0032] Among them, the transmission mechanism 110 is used to transmit the component to be welded 10, and the component to be welded 10 includes a cell and a solder ribbon. The heating plate 120 is disposed below the portion of the transmission mechanism 110 for placing the component to be welded 10, and the heating plate 120 is used to heat the component to be welded 10. The heating hood mechanism 130 is disposed above the portion of the transmission mechanism 110 for placing the component to be welded 10. The heating hood mechanism 130 includes a hood body 131 and a heating component 132. The heating component 132 is disposed in the hood body 131, and the heating component 132 is used to heat the component to be welded 10. The opening of the hood body 131 faces the heating plate 120, and the hood body 131 and the heating plate 120 cooperate to form a heating chamber.

[0033] The above photovoltaic module solder tape welding device 100 can be applied to the 0BB welding process. The components to be welded 10 are transported by the transport mechanism 110. The solar cells and the solder tapes thereon successively pass through the heating chamber. In the heating chamber, under the combined heat treatment of the heating plate 120 below and the heating hood mechanism 130 above, the solar cells are welded while the glue is cured. The heating hood mechanism 130 includes a hood body 131 and a heating component 132 disposed in the hood body 13. A relatively enclosed heating chamber is formed between the hood body 131 and the heating plate 120, and the temperature inside the space is relatively uniform and stable. The components to be welded 10 are heated from both above and below, which can improve the even heating of the glue on the upper and lower surfaces of the solar cells, making the curing speed more consistent and reducing the warping of the solar cells caused by excessive differences in the curing rates of the glue on the upper and lower surfaces.

[0034] In one example, the transport mechanism 110 includes a conveyor belt. The heating plate 120 is located below the conveying surface of the conveyor belt and close to the conveying surface. Openings can be provided on the conveyor belt to enable the heating plate 120 to better heat the components to be welded 10.

[0035] In one example, a plurality of fixing stations are provided on the transport mechanism 110. The fixing stations are used to place the solar cells. Fixing components for fixing the solar cells can be provided on each fixing station. The plurality of fixing stations are arranged along the transport direction of the transport mechanism 110. The hood body 131 has an inner cavity with sufficient length to cover the plurality of fixing stations.

[0036] In one example, the hood body 131 of the heating hood mechanism 130 covers at least 3 fixing stations, that is, more than 3 solar cells can be welded simultaneously. Further, the hood body 131 of the heating hood mechanism 130 covers at least 5 fixing stations.

[0037] For example, the hood body 131 covers 5 to 20 fixing stations, and 5 to 20 solar cells can be welded simultaneously. Further, the hood body 131 covers 10 to 20 fixing stations. In some specific examples, the number of fixing stations covered by the hood body 131 is 5, 7, 9, 11, 13, 15, 17, 19, 20, etc.

[0038] In one example, in the transport direction of the transport mechanism 110, the length of the heating chamber is 0.4m to 1.5m. Further, in the transport direction of the transport mechanism 110, the length of the heating chamber is 0.8m to 1.5m. In some specific examples, in the transport direction of the transport mechanism 110, the length of the heating chamber is 0.4m, 0.6m, 0.8m, 1m, 1.2m, 1.4m, 1.5m, etc.

[0039] In the above example, the heating chamber has a relatively long length, allowing more than 3 solar cells to be welded simultaneously. Without reducing the transmission speed of the transmission mechanism 110 and thus the production efficiency, the solar cells stay in the heating chamber for a longer time, that is, the welding time is longer. On this basis, the temperature in the heating chamber can be set relatively low. For example, the temperature in the heating chamber is slightly higher than the melting point of the solder tape coating. Through long-term welding, it can ensure that the solder tape coating is fully melted and in full contact with the grid lines to achieve welding. The relatively low-temperature welding method can avoid damage to the solar cells caused by high temperature, such as problems like over-welding caused by high temperature.

[0040] In one example, the distance between the lower end of the cover 131 and the heating plate 120 is 20 mm to 40 mm, so as to form a relatively enclosed heating chamber between the cover and the heating plate, with a relatively uniform and stable temperature inside the space, reducing the occurrence of warping of the solar cells caused by too large a difference in the curing rate of the glue on the upper and lower surfaces of the solar cells. Further, in one example, the distance between the lower end of the cover 131 and the heating plate 120 is 25 mm to 35 mm. In some specific examples, the distance between the lower end of the cover 131 and the heating plate 120 is 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, etc.

[0041] In one example, the heating component 132 includes a plurality of heating lamps distributed in the cover 131.

[0042] Further, in one example, the heating lamp is a strip-shaped lamp with an extending direction parallel to the transmission direction of the transmission mechanism 110. Further, the arrangement direction of the plurality of heating lamps is perpendicular to the transmission direction of the transmission mechanism 110.

[0043] The temperature in the heating chamber can be adjusted by controlling the density, power, and efficiency of the heating lamps, etc.

[0044] For example, in one example, the distance between adjacent heating lamps is 30 mm to 60 mm. Further, the distance between adjacent heating lamps is 40 mm to 50 mm. In some specific examples, the distance between adjacent heating lamps is 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, etc.

[0045] For example, in one example, the power of the heating lamp is 1000 W to 2200 W. Further, the power of the heating lamp is 1300 W to 2000 W.

[0046] In one example, the power of each heating lamp can be adjusted individually. In one example, the efficiency of each heating lamp can be adjusted individually. For example, the efficiency of each heating lamp can be adjusted within the range of 30% to 70%. In this way, during the welding process, the temperature in the heating chamber can be adjusted within the range of 140 to 200 °C.

[0047] In one example, the heating hood mechanism 130 further includes a temperature detection component and a heating control component. The temperature detection component is used to detect the temperature in the heating chamber. The heating control component is electrically connected to the heating component 132, and the heating control component is used to adjust the power or efficiency of the heating component 132 according to the temperature of the heating chamber detected by the temperature detection component, so as to maintain the stability of the temperature in the heating chamber.

[0048] The above photovoltaic module solder ribbon welding device 100 can be applied to the 0BB welding process. This process includes the following steps:

[0049] Print an adhesive on the solar cell with grid lines distributed on its surface; the adhesive preferably uses a thermosetting adhesive. The adhesive can be, but is not limited to, silicone adhesives, acrylic adhesives, epoxy adhesives, etc. The curing temperature of the adhesive is, for example, 100 °C to 150 °C. The curing time of the adhesive is, for example, 10 s to 30 s.

[0050] Place the solder ribbon coated with a flux coating on adjacent solar cells to obtain the component to be welded 10. The solder ribbon uses materials that can achieve welding at relatively low temperatures, such as tin-lead alloys, tin-lead-bismuth alloys, where the proportion of tin atoms is less than or equal to 60%, the proportion of lead alloy atoms is less than or equal to 50%, and the proportion of bismuth alloy atoms is less than or equal to 30%.

[0051] Transmit the component to be welded 10 through the transmission mechanism 110. The solar cells and the solder ribbons on them pass through the heating chamber one after another. In the heating chamber, the component to be welded 10 undergoes heat treatment under the combined action of the heating plate 120 below and the heating hood mechanism 130 above, the adhesive cures, and the solder ribbon is welded to the grid lines on the solar cells.

[0052] Take Figure 3 the heat treatment of the photovoltaic module solder ribbon welding device 100 shown as an example. The component to be welded 10 is transmitted into the heating chamber through the transmission mechanism 110. In the heating chamber, 11 solar cells are heated simultaneously. The multiple heating lamps in the hood 131 are in a long-on state, and the solar cells in the heating chamber are always in a heated state. The temperature in the heating chamber is slightly higher than the melting point of the solder ribbon coating. Long-time welding can ensure that the solder ribbon coating is fully melted and in full contact with the grid lines to achieve welding. The relatively low-temperature welding method can avoid damage to the solar cells caused by high temperature, such as avoiding problems like over-welding caused by high temperature.

[0053] Since a relatively enclosed heating cavity is formed between the cover body 131 and the heating plate 120, the temperature inside the heating cavity is relatively uniform and stable. There are heating elements above and below the component 10 to be welded, which can improve the uniform heating degree of the glue on the upper and lower surfaces of the battery cell, making the curing speed more consistent and reducing the warping of the battery cell caused by too large a difference in the curing rates of the glue on the upper and lower surfaces of the battery cell.

[0054] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0055] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims, and the description can be used to explain the content of the claims.

Claims

1. A photovoltaic module ribbon welding device (100), characterized in that: include: A transmission mechanism (110) used for transmitting a component to be welded (10) including a battery cell and a welding ribbon; a heating plate (120), arranged below a portion of the transmission mechanism (110) for placing the component to be welded (10), the heating plate (120) being used to heat the component to be welded (10); as well as A heating hood mechanism (130) is arranged above a portion of the transmission mechanism (110) for placing the assembly to be welded (10); the heating hood mechanism (130) comprises a hood body (131) and a heating component (132); the heating component (132) is arranged in the hood body (131) and is used to heat the assembly to be welded (10); an opening of the hood body (131) faces the heating plate (120); the hood body (131) cooperates with the heating plate (120) to form a heating chamber.

2. The photovoltaic module ribbon welding device (100) according to claim 1, characterized in that: The transmission mechanism (110) is provided with a plurality of fixed workstations for placing battery cells, the plurality of fixed workstations are arranged along the transmission direction of the transmission mechanism (110), and the cover body (131) is provided on at least three of the fixed workstations.

3. The photovoltaic module ribbon welding device (100) according to claim 2, characterized in that: The cover body (131) is arranged to cover 5 to 20 of the fixed workstations.

4. The photovoltaic module ribbon welding device (100) according to any one of claims 1 to 3, characterized in that: In the transmission direction of the transmission mechanism (110), the length of the heating chamber is 0.4 m to 1.5 m.

5. The photovoltaic module ribbon welding device (100) according to claim 1, characterized in that: The heating component (132) comprises a plurality of heating lamps distributed in the cover body (131).

6. The photovoltaic module ribbon welding device (100) according to claim 5, characterized in that: The heating lamp is a strip-shaped lamp whose extension direction is parallel to the transmission direction of the transmission mechanism (110), and the arrangement direction of the plurality of heating lamps is perpendicular to the transmission direction of the transmission mechanism (110).

7. The photovoltaic module ribbon welding device (100) according to claim 6, characterized in that: The distance between adjacent heating lamps is 30 mm to 60 mm.

8. The photovoltaic module ribbon welding device (100) according to any one of claims 1 to 3 and 5 to 7, characterized in that: The distance between the lower end of the cover body (131) and the heating plate (120) is 20 mm to 40 mm.

9. The photovoltaic module ribbon welding device (100) according to any one of claims 1 to 3 and 5 to 7, characterized in that: The transmission mechanism (110) comprises a conveyor belt, and the heating plate (120) is located below a conveying surface of the conveyor belt and close to the conveying surface.

10. The photovoltaic module ribbon welding device (100) according to any one of claims 1 to 3 and 5 to 7, characterized in that: The heating cover mechanism (130) further comprises a temperature detection component and a heating control component, the temperature detection component being used to detect the temperature in the heating chamber, the heating control component being electrically connected to the heating component (132), and the heating control component being used to adjust the power or efficiency of the heating component (132) according to the temperature detected by the temperature detection component.

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