Photovoltaic module and method for manufacturing the same

Abstract

The present application relates to a photovoltaic module and a method for manufacturing the same, wherein the photovoltaic module includes a cell string and a welding ribbon, wherein the cell string includes a plurality of cell cells arranged side by side, and the welding ribbon is located on one side of the cell cells and is used to connect the plurality of cell cells. Multiple welding areas are provided on the side of the cell cells facing the welding ribbon, and the multiple welding areas are spaced apart along the length of the photovoltaic module. Connectors are provided on the welding areas, and the welding ribbon is welded to the welding areas via the connectors, thereby reducing the possibility of a cold weld between the welding ribbon and the cell cells. After the welding ribbon is welded to the cell cells, a recessed portion is formed on the surface of the connector, indicating that the organic solvent in the connector has volatilized from the connector, thereby improving the reliability of the welding ribbon and the cell cells after welding.

Description

Technical Field

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

[0002] In the back-contact battery design, the positive and negative poles of the battery are both designed on the back of the battery. At the same time, the grid lines and connection points on the outermost edge of the battery are almost in line with the edge of the battery silicon wafer. In the process of welding multiple battery cells into a battery string, there is a high risk of problems such as cold soldering at the connection points, which reduces the yield rate of battery production. Summary of the Invention

[0003] The present application provides a photovoltaic module and a method for manufacturing the photovoltaic module, which are used to solve the problem of poor solder joints at the connection points of battery cells.

[0004] An embodiment of the present application provides a photovoltaic assembly, comprising:

[0005] A battery string, wherein the battery string comprises a plurality of battery cells, and the plurality of battery cells are arranged in parallel along the length direction of the photovoltaic module;

[0006] A welding ribbon, located on one side of the cell along the thickness direction of the photovoltaic module, for connecting adjacent cells;

[0007] Among them, a plurality of welding areas are arranged on the side of the cell facing the welding strip along the length direction of the photovoltaic module, a connecting piece is arranged between the welding area and the welding strip, the welding strip is connected to the welding area through the connecting piece, and the surface of the connecting piece has a recessed portion.

[0008] In a possible implementation manner, in a projection along the thickness direction of the photovoltaic module, the projection of the recessed portion is located outside the projection of the welding strip.

[0009] In a possible implementation manner, the surface of the connector has a plurality of recessed portions, and the plurality of recessed portions are arranged at intervals on the surface of the connector.

[0010] In a possible implementation manner, the surface of the connecting piece has a plurality of recessed portions, and adjacent recessed portions are connected to each other.

[0011] In a possible implementation manner, along the thickness direction of the photovoltaic module, the projection of the recessed portion in the solar cell is circular or elliptical.

[0012] In a possible implementation, along the thickness direction of the photovoltaic module, a projection of the recessed portion in the cell has a size of 3 μm to 15 μm along the width direction of the photovoltaic module.

[0013] In a possible embodiment, the connecting member includes a first area and a second area, the second area is arranged around the first area, the first area and the second area both have the recessed portion, and the size of the recessed portion in the first area is smaller than the size of the recessed portion in the second area.

[0014] In a possible implementation manner, the density of the recessed portions in the second region is 3×10 3 Pieces / mm 2 to 13×10 4 Pieces / mm 2 .

[0015] In a possible embodiment, the connecting member further includes a third region, which is arranged around the second region. Along the width direction of the photovoltaic component, the width of the third region is smaller than the width of the second region, and the transmittance of the third region is greater than the transparency of the first region and the second region.

[0016] In a possible implementation manner, the connecting member is solder paste, and the soldering ribbon and the soldering area are soldered together using the solder paste.

[0017] The present application also provides a method for manufacturing a photovoltaic module, wherein the photovoltaic module includes a cell string, a backsheet, an adhesive film, and photovoltaic glass. The cell string includes cell sheets, a welding ribbon, and a connector. The method for manufacturing the photovoltaic module includes the following steps:

[0018] placing the connector on the battery cell;

[0019] heating and fixing the connecting member on the battery cell;

[0020] placing the plurality of battery cells fixed with the connectors on an operating platform;

[0021] Placing the welding ribbon on the side of the battery cell where the connector is fixed;

[0022] Welding the welding ribbon to the battery cell through the connecting piece to obtain the battery string;

[0023] The photovoltaic module is obtained by laminating the back sheet, the adhesive film, the cell string and the photovoltaic glass.

[0024] In a possible embodiment, the connecting member is solder paste. When the connecting member is heated and fixed to the cell, the method for manufacturing the photovoltaic module includes:

[0025] The solder paste is heated to 120° C. to 180° C. for 10 seconds to 60 seconds.

[0026] In one possible embodiment, the cell includes a positive busbar and a negative busbar. When a plurality of the cell are placed on an operating platform, the method for manufacturing the photovoltaic module includes:

[0027] One of the two adjacent solar cells is rotated 180 degrees, so that the positive busbar of one of the adjacent solar cells and the negative busbar of the other are located in the same straight line along the length direction of the photovoltaic module.

[0028] The present application also provides a processing device for manufacturing a photovoltaic module, wherein the photovoltaic module includes a cell and a welding ribbon, and the processing device includes:

[0029] an operating platform, wherein the battery cell is located on the operating platform;

[0030] A pressing tool, the pressing tool being located on a side of the operating platform where the battery cell is placed;

[0031] Among them, the pressing tool includes a bracket and multiple abutment members. Along the height direction of the processing equipment, the bracket is arranged parallel to the welding strip. One end of the abutment member is connected to the bracket, and the other end can abut against the welding strip.

[0032] The present application provides a photovoltaic module and a method for manufacturing the same, wherein the photovoltaic module includes a cell string and a welding ribbon, wherein the cell string includes a plurality of cell cells arranged side by side, and the welding ribbon is located on one side of the cell cells and is used to connect the plurality of cell cells. Multiple welding areas are provided on the side of the cell cells facing the welding ribbon, and the multiple welding areas are spaced apart along the length of the photovoltaic module. Connectors are provided on the welding areas, and the welding ribbon is welded to the welding areas via the connectors, thereby reducing the possibility of a cold weld between the welding ribbon and the cell cells. After the welding ribbon is welded to the cell cells, a recessed portion is formed on the surface of the connector, indicating that the organic solvent in the connector has volatilized from the connector, thereby improving the reliability of the welding ribbon and the cell cells after welding.

[0033] 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

[0034] Figure 1 A schematic diagram of the structure of a battery cell provided in an embodiment of the present application;

[0035] Figure 2 A schematic diagram of the structure of the battery cell and connector provided in an embodiment of the present application;

[0036] Figure 3 A schematic diagram of the structure of a battery string provided in an embodiment of the present application;

[0037] Figure 4A schematic diagram of the structure of the processing equipment provided in the embodiment of the present application;

[0038] Figure 5 A microstructure diagram of a connector provided in an embodiment of the present application;

[0039] Figure 6 A partial enlarged view of a connector provided in an embodiment of the present application;

[0040] Figure 7 A schematic structural diagram of a first embodiment of a connector provided in an embodiment of the present application;

[0041] Figure 8 This is a schematic structural diagram of the second embodiment of the connector provided in the embodiment of the present application.

[0042] Reference numerals:

[0043] 1-battery string;

[0044] 11-battery cell;

[0045] 111- welding area;

[0046] 12-welding strip;

[0047] 13-connecting piece;

[0048] 131-First Area;

[0049] 132-Second Area;

[0050] 133-depression;

[0051] 134-Third Area;

[0052] 2-Operation platform;

[0053] 3-Pressing tooling;

[0054] 31- bracket;

[0055] 32- abutment member;

[0056] 33-Elastic part.

[0057] 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

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] like Figures 1 to 7 As shown, an embodiment of the present application provides a photovoltaic module, including a cell string 1 and a welding ribbon 12. The cell string 1 includes a plurality of cells 11 arranged in parallel along the length direction X of the photovoltaic module. Along the thickness direction Z of the photovoltaic module, the welding ribbon 12 is located on one side of the cell 11 and is used to connect adjacent cell 11. A plurality of welding areas 111 are provided on the side of the cell 11 facing the welding ribbon 12. The plurality of welding areas 111 are spaced apart along the length direction X of the photovoltaic module. Connectors 13 are provided on the welding areas 111, so that the welding ribbon 12 is connected to the welding areas 111 on the cell 11 through the connecting members 13. After the welding ribbon 12 is connected to the welding area 111, the surface of the connecting member 13 has a recessed portion 133.

[0064] The cell 11 may be a back-contact cell 11. The positive and negative busbars on the cell 11 are both arranged on the same side of the cell 11. The connection regions are spaced apart along the positive and negative busbars. When connecting multiple cells 11 into a cell string 1, the positive and negative busbars on adjacent cells 11 need to be connected via welding ribbons 12. The connector 13 is located in the connection region, so that the welding ribbon 12 is connected to the connection region of the cell 11 via the connector 13. This reduces the possibility of a cold weld between the welding ribbon 12 and the cell 11, thereby improving the yield rate of the photovoltaic module. It also improves the reliability of the connection between the welding ribbon 12 and the cell 11, thereby extending the service life of the photovoltaic module. The main component of the connector 13 can be a metal such as tin-lead or tin-bismuth-silver, and an organic solvent is also added to the connector 13 to facilitate welding the soldering ribbon 12 and the battery cell 11. When the connector 13 is heated, the organic solvent will evaporate due to the heat, forming a recessed portion 133 on the surface of the connector 13. After the organic solvent evaporates, it is beneficial to improve the welding strength between the soldering ribbon 12 and the battery cell 11.

[0065] like Figures 3 to 7 As shown, in a possible embodiment, along the thickness direction Z of the photovoltaic module, the welding ribbon 12 overlaps with the connecting member 13, and in the projection along the thickness direction Z of the photovoltaic module, the projection of the recessed portion 133 on the battery cell 11 is located outside the projection area of the welding ribbon 12 on the battery cell 11.

[0066] In a possible embodiment, in the projection along the thickness direction Z of the photovoltaic module, the projection of the recessed portion 133 on the cell 11 overlaps with the projection of the welding ribbon 12 on the cell 11, so that the position where the welding ribbon 12 overlaps with the connector 13 also has a recessed portion 133.

[0067] When connector 13 is heated, the organic solvent within connector 13 evaporates before connector 13 is fully cured, resulting in a recessed portion 133 on the surface of connector 13 after it is cured. Before connector 13 is heated, the organic solvent is uniformly mixed with the other components within connector 13. Therefore, the recessed portion 133 formed by the evaporation of the organic solvent may or may not overlap with solder ribbon 12. Overlapping recessed portion 133 with solder ribbon 12 reduces the contact area between solder ribbon 12 and connector 13, thereby reducing the strength of the connection between the two. Therefore, ideally, the projection of recessed portion 133 lies outside the projection of solder ribbon 12.

[0068] like Figure 6 and Figure 7 As shown, in a possible embodiment, a plurality of recessed portions 133 are provided on the surface of the connecting member 13 , and the plurality of recessed portions 133 are arranged at intervals.

[0069] During the volatilization process of the organic solvent, the gaseous organic solvent forms bubbles on the surface of the connector 13. As the gaseous organic solvent in the bubbles gradually increases, the bubbles burst, forming recessed portions 133 on the surface of the connector 13. During the vaporization process of the organic solvent, adjacent organic solvents converge into a single bubble, which then evaporates out of the connector 13, resulting in the recessed portions 133 on the surface of the connector 13 being arranged at intervals.

[0070] In a possible embodiment, the surface of the connecting member 13 has a plurality of recessed portions 133 , and adjacent recessed portions 133 are connected to each other.

[0071] When there is a large amount of organic solvent in the connector 13 or the heating temperature is high, the organic solvent reacts violently when volatilizing, causing bubbles to form multiple times at the same or similar positions on the surface of the connector 13. After the bubbles burst, interconnected recessed portions 133 are formed.

[0072] In a possible embodiment, the recess 133 is formed by the bursting of bubbles formed by the vaporization of the organic solvent in the connector 13. Therefore, in the projection along the thickness direction Z of the photovoltaic module, the projection of the recess 133 in the cell 11 is circular or elliptical.

[0073] Since the projection of the recessed portion 133 along the thickness direction Z of the photovoltaic module is circular or elliptical, the recessed portion 133 can be hemispherical or cylindrical, which facilitates the evaporation of the organic solvent from the connector 13, reduces the residual organic solvent in the connector 13, and is beneficial to improving the reliability of the welding between the soldering ribbon 12 and the battery cell 11.

[0074] In a possible embodiment, along the width Y direction of the photovoltaic module, a size of a projection of the recessed portion 133 along the thickness Z direction of the photovoltaic module is 3 μm to 15 μm.

[0075] The width of the recessed portion 133 can be 3μm, 6μm, 9μm, 12μm, 15μm, etc., preferably 9μm. If the width of the recessed portion 133 is less than 3μm, the effect of volatilization of the organic solvent will be reduced. The increase in the width of the recessed portion 133 will facilitate the volatilization of the organic solvent. Along the width Y direction of the photovoltaic module, the width of the connector 13 is 0.2mm to 1mm, specifically 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. If the width of the recessed portion 133 is greater than 15μm, the recessed portion 133 will account for a large proportion in the connector 13, which may affect the connection strength between the welding strip 12 and the connector 13.

[0076] like Figure 7As shown, in a possible embodiment, the connecting member 13 includes a first region 131 and a second region 132, wherein the second region 132 is arranged around the first region 131. Recesses 133 are provided in both the first region 131 and the second region 132, and the average size of the recesses 133 in the first region 131 is smaller than the average size of the recesses 133 in the second region 132.

[0077] When the connector 13 is heated, a portion of the organic solvent in the connector 13 will volatilize in the first region 131, and the other portion will flow from the first region 131 to the second region 132 and then volatilize in the second region 132, so that the organic solvent volatilized in the first region 131 is smaller than the organic solvent volatilized in the second region 132. Therefore, the size of the recessed portion 133 in the first region 131 is smaller than the size of the recessed portion 133 in the second region 132, and the number of the recessed portions 133 in the first region 131 may also be smaller than the number of the recessed portions 133 in the second region 132.

[0078] In a possible embodiment, the density of the recessed portions 133 in the second region 132 is 3×10 3 Pieces / mm 2 to 13×10 4 Pieces / mm 2 .

[0079] The density of the recessed portions 133 in the second region 132 may be 3×10 3 Pieces / mm 2 , 13×10 3 Pieces / mm 2 , 23×10 3 Pieces / mm 2 , 33×10 3 Pieces / mm 2 , 43×10 3 Pieces / mm 2 53×10 3 Pieces / mm 2 , 63×10 3 Pieces / mm 2 , 73×10 3 Pieces / mm 2 ,83×10 3 Pieces / mm 2 93×10 3 Pieces / mm 2 , 3×10 4 Pieces / mm 2 , 13×10 4 Pieces / mm 2 If the number of the recessed portions 133 in the second region 132 is less than 3×10 3 Pieces / mm 2, which will reduce the effect of organic solvent volatilization, resulting in organic solvent residue in the second area 132, thereby reducing the reliability of welding between the solder ribbon 12 and the battery cell 11. If the number of recessed portions 133 in the second area 132 is greater than 13×10 4 Pieces / mm 2 , which will reduce the area of the second region 132 of the connector 13 that can contact the soldering ribbon 12 and reduce the connection strength between the second region 132 and the soldering ribbon 12.

[0080] like Figure 8 As shown, in a possible embodiment, the connector 13 further includes a third region 134, which is disposed around the second region 132. During the heating process of the connector 13, the organic solvent will precipitate in a direction from the first region 131 to the second region 132. During the precipitation process, part of the organic solvent will volatilize in the first region 131 and the second region 132, forming a recessed portion 133 in the first region 131 and the second region 132. Part of the unvolatile organic solvent will continue to precipitate toward the edge of the second region 132, forming the third region 134 around the second region 132.

[0081] Along the width direction Y of the photovoltaic module, the width of the third region 134 is smaller than the width of the second region 132. During the heating process of the connector 13, most of the organic solvent evaporates in the first region 131 or the second region 132, while a small amount of organic solvent forms the third region 134. Therefore, the width of the third region 134 is smaller than the width of the second region 132.

[0082] The third region 134 is composed of non-volatile organic solvent, so there is no depression 133 formed by the volatilization of the organic solvent in the third region 134. The density of the depressions 133 in the first region 131 can be 100 / mm 2 Up to 2000 pieces / mm 2 Specifically, the density of the recessed portions 133 in the first region 131 may be 100 / mm 2 , 500 pieces / mm 2 , 1000 pieces / mm 2 , 1500 pieces / mm 2 , 2000 pieces / mm 2 Compared with the first region 131 and the second region 132, the density of the recessed portions 133 in the third region 134 may be 0 to 100 / mm 2 Specifically, the density of the recessed portions 133 in the third region 134 may be 0, 20 / mm 2 , 40 pieces / mm 2 , 60 pieces / mm 2 , 80 pieces / mm 2 , 100 pieces / mm 2Therefore, the third region 134 has a higher flatness than the first region 131 and the second region 132. An organic solvent precipitates in the first region 131 and the second region 132 of the connector 13. The organic solvent is mainly composed of tin-lead or tin-bismuth-silver, etc., and its transparency is lower than that of the organic solvent. The transparency of the third region 134 is approximately 70% to 80%, and can be specifically 70%, 75%, 80%, etc. The first region 131 and the second region 132 are opaque or have a lower transparency than the third region 134.

[0083] In a possible embodiment, the connector 13 may be solder paste, and the solder ribbon 12 and the soldering area 111 of the battery cell 11 are soldered together using the solder paste.

[0084] The solder paste can increase the capillary action and wettability, reducing the possibility of cold solder joints between the solder ribbon 12 and the battery cell 11. At the same time, the solder paste can also isolate the air to prevent oxidation of the solder joints between the solder ribbon 12 and the battery cell 11, which is beneficial to improving the reliability of the soldering between the solder ribbon 12 and the battery cell 11.

[0085] A plurality of parallel arranged battery cells 11 are connected to form a battery string 1 through welding strips 12. The upper and lower surfaces of the battery string 1 are provided with adhesive films. Photovoltaic glass is also provided on the upper surface of the battery string 1 and connected to the battery string 1 through the adhesive film. Photovoltaic glass or backplane is also provided on the lower surface of the battery string 1 and is also connected to the battery string 1 through the adhesive film to form a photovoltaic module.

[0086] The present application also provides a method for manufacturing a photovoltaic module, wherein the photovoltaic module includes a cell string 1, a backsheet, an adhesive film, and photovoltaic glass. The photovoltaic glass, adhesive film, cell string 1, adhesive film, and backsheet are sequentially arranged along the thickness direction of the photovoltaic module. The cell string 1 includes cell sheets 11, welding ribbons 12, and connectors 13. Multiple cell sheets 11 are arranged side by side along the length direction of the photovoltaic module. The welding ribbons 12 are used to connect adjacent cell sheets 11 with the connectors 13. The connectors 13 are provided on each of the multiple cell sheets 11, and the welding ribbons 12 are welded to the cell sheets 11 via the connectors 13.

[0087] The method for manufacturing a photovoltaic module comprises the following steps:

[0088] S1, placing the connector 13 on the battery cell 11;

[0089] S2, fixing the connector 13 on the battery cell 11 by heating;

[0090] S3, placing the battery cell 11 fixed with the connector 13 on the operating platform 2;

[0091] S4, placing the soldering ribbon 12 on the side of the battery cell 11 where the connector 13 is fixed;

[0092] S5, welding the welding ribbon 12 to the battery cell 11 through the connector 13 to obtain the battery string 1;

[0093] S6. Laminating the back sheet, the adhesive film, the cell string 1 and the photovoltaic glass to obtain the photovoltaic module.

[0094] The connector 13 is first fixed to the battery cell 11 by heating, which limits the relative position between the connector 13 and the battery cell 11. In the step of welding the welding ribbon 12 to the battery cell 11 through the connector 13, the possibility of displacement of the connector 13 is reduced, and the possibility of cold welding between the welding ribbon 12 and the battery cell 11 is reduced.

[0095] The battery cell 11 includes a welding area 111 . The welding ribbon 12 is connected to the welding area 111 in the battery cell 11 . Therefore, the connector 13 is disposed in the welding area 111 .

[0096] When the connector 13 is placed on the cell 11, the method for manufacturing the photovoltaic module includes:

[0097] S11 , printing the connector 13 on the welding area 111 of the battery cell 11 .

[0098] The connector 13 is set in the welding area 111 by printing, which makes it easy to control the position and shape of the connector 13 so that the connector 13 is located at the welding position between the welding ribbon 12 and the battery cell 11. When the welding ribbon 12 is welded to the battery cell 11, the connector 13 can reduce the possibility of cold welding.

[0099] The connector 13 may be solder paste. When the connector 13 is heated and fixed to the cell 11, the method for manufacturing the photovoltaic module includes:

[0100] S21. Heat the solder paste to 120°C to 180°C and continue heating for 10s to 60s.

[0101] The cell 11 printed with solder paste is placed in a curing oven and heated at temperatures of 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, etc., for a heating time of 10s, 20s, 30s, 40s, 50s, 60s, etc., to solidify the solder paste and fix it to the cell 11. The solder paste contains organic solvents such as flux. During the curing process, the organic solvents such as flux in the solder paste will evaporate or precipitate from the center to the edge of the solder paste. Reducing the content of organic solvents in the solder paste can increase the soldering strength between the solder ribbon 12 and the cell 11.

[0102] The cell 11 includes a positive busbar and a negative busbar. The welding areas 111 in the cell 11 are arranged at intervals between the positive busbar and the negative busbar. The welding strips 12 are used to connect the positive busbars and the negative busbars in adjacent cell 11 .

[0103] When placing a plurality of cells 11 on the operating platform 2, the photovoltaic module processing method includes:

[0104] S31 , rotating one of the two adjacent solar cells 11 by 180°, so that the positive busbar of one of the adjacent solar cells 11 and the negative busbar of the other are in the same straight line along the longitudinal direction X of the photovoltaic module.

[0105] The positive main grid and the negative main grid in the battery cell 11 are arranged at intervals and in the same position. Therefore, along the length direction X of the photovoltaic module, the positive main grids in adjacent battery cells 11 are located in the same straight line, and the negative main grids are located in the same straight line. After rotating one of the adjacent battery cells 11 180°, the positive main grid and the negative main grid in the adjacent battery cells 11 are located in the same straight line, which is convenient for setting the welding strip 12.

[0106] After the soldering ribbon 12 is placed on the side of the cell 11 where the connector 13 is fixed, the processing method of the photovoltaic module includes:

[0107] S41 , fixing the soldering ribbon 12 to the side of the battery cell 11 where the connector 13 is provided.

[0108] A force is applied to the soldering ribbon 12 on the side away from the battery cell 11 to fix the soldering ribbon 12 on the battery cell 11. When the soldering ribbon 12 and the battery cell 11 are subsequently welded, the possibility of displacement of the soldering ribbon 12 is reduced, which is beneficial to improving the yield of the battery string 1.

[0109] When the welding ribbon 12 is welded to the cell 11 through the connector 13 to obtain the cell string 1, the manufacturing method of the photovoltaic module includes:

[0110] S51 , infrared welding or electromagnetic welding is performed on the welding ribbon 12 and the battery cell 11 .

[0111] Infrared welding and electromagnetic welding can improve the welding strength between the welding ribbon 12 and the connector 13, which is beneficial to improving the reliability of the photovoltaic module.

[0112] When the soldering ribbon 12 is connected to the battery cell 11 via infrared welding, the infrared heating device can heat the soldering point to a temperature of 230°C to 240°C, specifically 230°C, 232°C, 234°C, 236°C, 238°C, 340°C, etc., for a heating time of less than 5 seconds. When the soldering point is heated during the welding process, the connector 13 will melt again. The high temperature heating further evaporates the residual organic solvent in the connector 13, reducing the residual organic solvent in the connector 13 and facilitating the improvement of the weld strength between the soldering ribbon 12 and the battery cell 11.

[0113] like Figure 4As shown, an embodiment of the present application further provides a processing device for manufacturing photovoltaic modules, including an operating platform 2 and a press tool 3. The photovoltaic module includes a cell 11 and a welding ribbon 12. A plurality of cell 11 are placed on the operating platform 2, and the welding ribbon 12 is then arranged between adjacent cell 11. At least a portion of the press tool 3 is located on the side of the operating platform 2 where the cell 11 is placed, and the press tool 3 can apply a force to the welding ribbon 12 pointing in the direction of the cell 11 from the side of the welding ribbon 12 away from the operating platform 2, thereby limiting the relative position of the welding ribbon 12 and the cell 11. The pressing tool 3 includes a bracket 31 and multiple abutments 32. The bracket 31 is used to fix the position of the abutment 32. The abutment 32 is used to provide a force on the welding strip 12. The abutment 32 is connected to the bracket 31 through an elastic member 33. When the pressing tool 3 fixes the position of the welding strip 12, the end of the abutment 32 away from the bracket 31 abuts against the welding strip 12, and at the same time compresses the elastic member 33. The elastic force of the elastic member 33 will be transmitted to the welding strip 12 through the abutment 32, so that the welding strip 12 is fixed to the battery cell 11.

[0114] The operating platform 2 and the pressing fixture 3 can limit the relative position of the battery cell 11 and the welding ribbon 12, reducing the possibility of the welding ribbon 12 shifting during the welding process, which is beneficial to improving the finished product rate of the photovoltaic module.

[0115] In a possible embodiment, the processing equipment also includes a heating device and a welding device, which are respectively located upstream and downstream of the operating platform. After the connectors are provided on the surface of the battery cell, they first enter the heating device to solidify the connectors so that the connectors are fixed to the battery cell. Then, the battery cell is placed on the operating platform, and the relative position of the welding ribbon and the battery cell is limited by the pressing tool. Finally, the welding device is placed to weld the welding ribbon to the battery cell.

[0116] The present application provides a photovoltaic module, a method for manufacturing a photovoltaic module, and processing equipment, wherein the photovoltaic module includes a cell string 1 and a welding ribbon 12. The cell string 1 includes a plurality of cell cells 11 arranged side by side. The welding ribbon 12 is located on one side of the cell cells 11 and is used to connect the plurality of cell cells 11. A plurality of welding regions 111 are provided on the side of the cell cells 11 facing the welding ribbon 12. The plurality of welding regions 111 are spaced apart along the longitudinal direction X of the photovoltaic module. Connectors 13 are provided on the welding regions 111. The welding ribbon 12 is welded to the welding regions 111 via the connectors 13, thereby reducing the possibility of a cold weld between the welding ribbon 12 and the cell cells 11. After the welding ribbon 12 is welded to the cell cells 11, a recessed portion 133 is formed on the surface of the connector 13, indicating that the organic solvent in the connector 13 has volatilized from the connector 13, thereby improving the reliability of the welding ribbon 12 and the cell cells 11 after welding.

[0117] 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 comprises: A battery string (1), the battery string (1) comprising a plurality of battery cells (11), wherein the plurality of battery cells (11) are arranged in parallel along the length direction of the photovoltaic module; A welding strip (12), the welding strip (12) being located on one side of the cell (11) along the thickness direction of the photovoltaic module and being used to connect adjacent cell slices (11); A plurality of welding areas (111) are provided on a side of the cell (11) facing the welding strip (12) along the length direction of the photovoltaic module, a connecting piece (13) is provided between the welding area (111) and the welding strip (12), the welding strip (12) is connected to the welding area (111) via the connecting piece (13), and a recessed portion (133) is provided on the surface of the connecting piece (13); In a projection along the thickness direction of the photovoltaic component, the projection of the recessed portion (133) is located outside the projection of the welding strip (12).

2. The photovoltaic module according to claim 1, characterized in that The surface of the connecting member (13) has a plurality of recessed portions (133), and the plurality of recessed portions (133) are arranged at intervals on the surface of the connecting member (13).

3. The photovoltaic module according to claim 1, characterized in that The surface of the connecting piece (13) has a plurality of recessed portions (133), and adjacent recessed portions (133) are connected to each other.

4. The photovoltaic module according to claim 1, characterized in that Along the thickness direction of the photovoltaic component, the projection of the recessed portion (133) in the cell sheet (11) is circular or elliptical.

5. The photovoltaic module according to claim 1, characterized in that Along the thickness direction of the photovoltaic component, the projection size of the recessed portion (133) in the cell sheet (11) along the width direction of the photovoltaic component is 3 μm to 15 μm.

6. The photovoltaic module according to claim 1, characterized in that The connecting member comprises a first region (131) and a second region (132), wherein the second region (132) is arranged around the first region (131), and both the first region (131) and the second region (132) have the recessed portion (133), and the size of the recessed portion (133) in the first region (131) is smaller than the size of the recessed portion (133) in the second region (132).

7. The photovoltaic module according to claim 6, characterized in that: The density of the recessed portions (133) in the second region (132) is 3×10 3 Pieces / mm 2 to 13×10 4 Pieces / mm 2 .

8. The photovoltaic module according to claim 6, characterized in that: The connecting member (13) further includes a third region (134), the third region (134) being arranged around the second region (132), the width of the third region (134) being smaller than the width of the second region (132) along the width direction of the photovoltaic module, and the light transmittance of the third region (134) being greater than the transparency of the first region (131) and the second region (132).

9. The photovoltaic module according to any one of claims 1 to 8, characterized in that: The connecting member (13) is solder paste, and the soldering strip (12) and the soldering area (111) are soldered via the solder paste.

10. A method for manufacturing a photovoltaic module, the photovoltaic module comprising a cell string (1), a back sheet, an adhesive film and photovoltaic glass, the cell string (1) comprising a cell sheet (11), a welding ribbon (12) and a connector (13), a plurality of welding areas (111) being provided on a side of the cell sheet (11) facing the welding ribbon (12), the welding ribbon (12) being connected to the welding area (111) via the connector (13), the surface of the connector (13) having a recessed portion (133); in a projection along the thickness direction of the photovoltaic module, the projection of the recessed portion (133) is located outside the projection of the welding ribbon (12), and the method is characterized in that: The method for manufacturing the photovoltaic module comprises the following steps: placing the connecting member (13) on the battery cell (11); heating and fixing the connecting member (13) on the battery cell (11); Placing the plurality of battery cells (11) with the connectors (13) fixed thereto on an operating platform (2); Placing the welding ribbon (12) on the side of the battery cell (11) where the connecting member (13) is fixed; Welding the welding ribbon (12) to the battery cell (11) via the connecting piece (13) to obtain the battery string (1); The backboard, the adhesive film, the cell string (1) and the photovoltaic glass are laminated to obtain the photovoltaic module.

11. The method for manufacturing a photovoltaic module according to claim 10, wherein: The connecting member (13) is solder paste. When the connecting member (13) is heated and fixed to the cell (11), the method for manufacturing the photovoltaic module includes: The solder paste is heated to 120° C. to 180° C. for 10 seconds to 60 seconds.

12. The method for manufacturing a photovoltaic module according to claim 10, wherein: The cell (11) comprises a positive main grid and a negative main grid. When a plurality of the cell (11) are placed on an operating platform (2), the method for manufacturing the photovoltaic module comprises: One of the two adjacent battery cells (11) is rotated 180 degrees, so that the positive main grid of one of the adjacent battery cells (11) and the negative main grid of the other are located in the same straight line along the length direction of the photovoltaic module.

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