Photovoltaic module and method of manufacturing the same

Abstract

Embodiments of the present application provide a photovoltaic module and a preparation method thereof, and relate to the technical field of photovoltaic power generation. The photovoltaic module comprises solar cell pieces, a solder strip and a first fixing adhesive. The number of the solar cell pieces is multiple, and two adjacent solar cell pieces comprise a first solar cell piece and a second solar cell piece. The back light surface of any solar cell piece is provided with multiple solder pads, and the multiple solder pads comprise positive and negative solder pads. The solder strip is located on the side where the back light surface of the solar cell piece is located, and the solder strip comprises multiple solder strip segments, and any solder strip segment connects the positive solder pad of the first solar cell piece and the negative solder pad of the second solar cell piece. At least a part of the first fixing adhesive is arranged between the end of the solder strip segment and the back light surface of the solar cell piece, and the first fixing adhesive adhesively connects the end of the solder strip segment and the back light surface of the solar cell piece. Embodiments of the present application can reduce the damage caused by the process of breaking the solder strip to the solar cell piece, and facilitate to improve the production yield of the photovoltaic module.

Description

Technical Field

[0001] The embodiments of this application relate to the technical field of photovoltaic power generation, and in particular to a photovoltaic module and its preparation method. Background Technology

[0002] A photovoltaic module consists of a solder ribbon and multiple solar cells. Each solar cell has a positive electrode pad and a negative electrode pad on its back surface. Typically, the solder ribbon and the positive and negative electrode pads of the multiple solar cells need to be connected separately. Then, the solder ribbon is broken to form multiple solder ribbon segments. Any solder ribbon segment connects to the positive and negative electrode pads of two adjacent solar cells.

[0003] The process of breaking the solder strip can potentially damage the solar cells, affecting the production yield of photovoltaic modules. Summary of the Invention

[0004] The embodiments of this application provide a photovoltaic module and its manufacturing method, which can reduce the damage to solar cells caused by the process of breaking the solder strip, and help improve the production yield of photovoltaic modules.

[0005] On one hand, embodiments of this application provide a photovoltaic module. The photovoltaic module includes solar cells, solder ribbons, and a first fixing adhesive. There are multiple solar cells arranged along a first direction, with adjacent solar cells comprising a first solar cell and a second solar cell. The light-receiving surface of the first solar cell and the back-lighting surface of the second solar cell partially overlap, or, along the first direction, the side of the first solar cell closer to the second solar cell and the side of the second solar cell closer to the first solar cell are at least partially bonded. Each solar cell's back-lighting surface has multiple solder pads, including positive and negative solder pads. The solder ribbon is located on the side of the solar cell's back-lighting surface, and includes multiple solder ribbon segments arranged along the first direction. Each solder ribbon segment connects the positive solder pad of the first solar cell and the negative solder pad of the second solar cell. At least a portion of the first fixing adhesive is disposed between the end of a solder ribbon segment and the back-lighting surface of the solar cell, bonding the end of the solder ribbon segment to the back-lighting surface of the solar cell.

[0006] In some possible implementations, the width of the first fixing adhesive along the second direction is greater than the width of the solder strip along the second direction, and the second direction is perpendicular to the first direction.

[0007] In some possible implementations, the width of the solder strip along the second direction is greater than or equal to 0.1 mm.

[0008] In some possible implementations, the solder strip is broken into multiple solder strip segments by a laser, the length of the first fixing adhesive along a first direction is greater than the diameter of the laser beam, and the width of the first fixing adhesive along a second direction is greater than the diameter of the laser beam, the second direction being perpendicular to the first direction.

[0009] In some possible implementations, the thickness of the first fixing adhesive ranges from 5 micrometers to 5000 micrometers.

[0010] In some possible implementations, the solar cell includes a first edge and a second edge disposed opposite each other along a first direction. Among a plurality of pads, the pad closest to the first edge along the first direction is designated as the first pad, and the pad closest to the second edge along the first direction is designated as the second pad. There are multiple first adhesive adhesives, with at least one first adhesive adhesive disposed between the first pad and the first edge along the first direction, and at least one first adhesive adhesive disposed between the second pad and the second edge.

[0011] In some possible implementations, when the light-receiving surface of the first solar cell and the back-lighting surface of the second solar cell partially overlap, the overlap length along a first direction is a first length, which is less than or equal to 5 mm. The distance between the first adhesive layer and the first edge, disposed between the first pad and the first edge, in the first direction is greater than the first length but less than or equal to 10 mm. The distance between the first adhesive layer and the second edge, disposed between the second pad and the second edge, in the first direction is greater than the first length but less than or equal to 10 mm.

[0012] In some possible implementations, when the first solar cell is at least partially attached to the side of the second solar cell near the first solar cell and the side of the second solar cell near the first solar cell, the distance between the first adhesive and the first edge in the first direction is less than or equal to 10 mm, and the distance between the first adhesive and the second edge in the first direction is less than or equal to 10 mm.

[0013] In some possible implementations, the material of the first fixing adhesive includes at least one of light-absorbing materials, heat-resistant materials, and reflective materials.

[0014] On the other hand, embodiments of this application provide a method for manufacturing a photovoltaic module. The method includes: forming a first fixing adhesive on the back surface of a solar cell; laying solder ribbons on the back surface of multiple solar cells, the solder ribbons being bonded to the back surface of the solar cells via the first fixing adhesive; soldering the solder ribbons to the pads of the multiple solar cells; and breaking the solder ribbons at the location of the first fixing adhesive to form multiple solder ribbon segments, with the end of any one solder ribbon segment located on the side of the first fixing adhesive away from the back surface of the solar cell.

[0015] In summary, the embodiments of this application have at least the following beneficial effects:

[0016] In the embodiments of this application, the first fixing adhesive is disposed between the solder ribbon (the end of the solder ribbon segment) and the back surface of the solar cell, so that the first fixing adhesive can bond the solder ribbon to the solar cell and reduce the risk of the solder ribbon shifting relative to the solar cell during the welding process.

[0017] During the process of breaking the solder ribbon, the solder ribbon can be broken at the location of the first fixing adhesive, so that at least a portion of the first fixing adhesive can be placed between the end of the solder ribbon segment and the back surface of the solar cell.

[0018] Understandably, breaking the solder ribbon at the location of the first fixing adhesive allows the first fixing adhesive to protect the solar cell, reducing the damage to the solar cell caused by the solder ribbon breaking process, and thus improving the production yield of photovoltaic modules.

[0019] In other words, in the embodiments of this application, the first fixative not only serves to bond and fix the solar cells, but also protects them during the process of breaking the solder ribbon, thereby improving the production yield of the photovoltaic module. Reusing the first fixative as the fixative for the solar cells eliminates the need for additional fixatives, simplifying the structure of the photovoltaic module and reducing its cost. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a photovoltaic module provided in some embodiments of this application;

[0022] Figure 2 A schematic diagram showing the positional relationship of the solar cell, cover plate, and encapsulant film provided in some embodiments of this application;

[0023] Figure 3 A schematic diagram showing the positional relationship between the first solar cell and the second solar cell provided in some embodiments of this application;

[0024] Figure 4 A schematic diagram showing the positional relationship between the first solar cell and the second solar cell provided in other embodiments of this application;

[0025] Figure 5This is a schematic diagram showing the connection relationship between the first and second solar cells.

[0026] Figure 6 This is a schematic diagram illustrating the connection relationship between the solder strip and the solar cell before disconnection, provided for some embodiments of this application.

[0027] Figure 7 A schematic diagram showing the positional relationship between the first fixing adhesive, the solder ribbon, the solar cell, and the second fixing adhesive provided in some embodiments of this application;

[0028] Figure 8 A flowchart illustrating the steps of a photovoltaic module fabrication method provided in some embodiments of this application;

[0029] Figure 9 This is a schematic diagram of the laying and welding of the welding strip provided for some embodiments of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 200 - Photovoltaic module, 210 - Solar cell, 210a - Solar cell string, 2101 - First solar cell, 2102 - Second solar cell, 211 - Pad, 2111 - Positive pad, 2112 - Negative pad, 211a - First pad, 211b - Second pad, 220 - Solder ribbon, 221 - Solder ribbon segment, 231 - First fixative, 231a - First first fixative, 231b - Second first fixative, 232 - Second fixative, 241 - First cover plate, 242 - Second cover plate, 251 - First adhesive film, 252 - Second adhesive film, L1 - First edge, L2 - Second edge, H1 - First length, Q1 - Light-receiving surface, Q2 - Backlighting surface, 301 - Roller, 302 - Heating rod, X - First direction, Y - Second direction. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In this application, the terms "upper," "left," "right," "front," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0034] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0035] Furthermore, the terms "installation," "setup," "equipped with," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0036] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0037] Figure 1 The diagram shows the structure of a photovoltaic module provided in some embodiments of this application. Figure 2 This is a schematic diagram illustrating the positional relationship of the solar cell, cover plate, and encapsulant film provided in some embodiments of this application. It is understood that, for the sake of simplicity, the accompanying drawings... Figure 2 The diagram does not show structures such as solder pads and solder strips.

[0038] like Figure 1 As shown, embodiments of this application provide a photovoltaic module 200, which can be understood to convert light energy (e.g., solar energy) into electrical energy to achieve photovoltaic power generation.

[0039] In some examples, such as Figure 1 As shown, the photovoltaic module 200 includes solar cells 210, and there are multiple solar cells 210 arranged along the first direction X.

[0040] like Figure 1 As shown, multiple solar cells 210 arranged along the first direction X can be connected in series to form a solar cell string 210a. The photovoltaic module 200 may include multiple solar cell strings 210a. The multiple solar cell strings 210a are arranged along the second direction Y, which is perpendicular to the first direction X.

[0041] Understandably, the second direction Y and the first direction X can be perpendicular or approximately perpendicular. That is, the angle between the second direction Y and the first direction X can be 90°, or it can be 88° or 89°, etc.

[0042] For example, a solar cell string 210a may include 10, 20, or 30 solar cells, and the photovoltaic module 200 may include 3, 4, 5, or 6 solar cell strings 210a. The number of solar cells 210 in different solar cell strings 210a may be the same. The embodiments of this application do not further limit the number of solar cells 210 in the solar cell string 210a or the number of solar cell strings 210a in the photovoltaic module 200.

[0043] In some examples, such as Figure 2 As shown, any solar cell 210 includes a light-receiving surface Q1 and a back-lighting surface Q2. Understandably, the light-receiving surface Q1 is used to receive light, and the back-lighting surface Q2 is away from the light.

[0044] Continue to refer to Figure 2 The photovoltaic module 200 may also include a first cover plate 241, a second cover plate 242, a first encapsulant film 251, and a second encapsulant film 252.

[0045] Along the thickness direction Z of the solar cell 210, the first cover plate 241 can be bonded to the back surface Q2 of the multiple solar cells 210 through the first adhesive film 251, and the second cover plate 242 can be bonded to the light-receiving surface Q1 of the multiple solar cells 210 through the second adhesive film 252.

[0046] Understandably, the first cover plate 241 and the second cover plate 242 can protect the solar cell 210. The first cover plate 241 and the second cover plate 242 can be glass covers to reduce the shading of light by the first cover plate 241 and the second cover plate 242.

[0047] The thickness direction Z of the solar cell 210 is perpendicular or approximately perpendicular to the plane containing the first direction X and the second direction Y. In other words, the angle between the thickness direction Z of the solar cell 210 and the plane containing the first direction X and the second direction Y can be 90°, 88°, or 89°, etc.

[0048] Figure 3 This is a schematic diagram showing the positional relationship between the first solar cell and the second solar cell, provided for some embodiments of this application. Figure 4 A schematic diagram showing the positional relationship between the first solar cell and the second solar cell provided for other embodiments of this application.

[0049] In some examples, such as Figure 3 and Figure 4As shown, the two adjacent solar cells 210 include a first solar cell 2101 and a second solar cell 2102.

[0050] In some examples, such as Figure 3 As shown, the light-receiving surface Q1 of the first solar cell 2101 and the back-lighting surface Q2 of the second solar cell 2102 partially overlap. In other examples, such as Figure 4 As shown, along the first direction X, the side of the first solar cell 2101 near the second solar cell 2102 and the side of the second solar cell 2102 near the first solar cell 2101 are at least partially attached.

[0051] Understandably, the light-receiving surface Q1 of the first solar cell 2101 and the back-lighting surface Q2 of the second solar cell 2102 are partially overlapped, or the side of the first solar cell 2101 near the second solar cell 2102 and the side of the second solar cell 2102 near the first solar cell 2101 are at least partially attached, so that there is no gap between the first solar cell 2101 and the second solar cell 2102, avoiding light leakage between the first solar cell 2101 and the second solar cell 2102, increasing the effective light-receiving area of ​​the photovoltaic module 200, thereby increasing the output power of the photovoltaic module 200.

[0052] For example, the way in which the light-receiving surface Q1 of the first solar cell 2101 and the back-lighting surface Q2 of the second solar cell 2102 are partially overlapped is called stacking.

[0053] The effective light-receiving area of ​​the photovoltaic module 200 can be increased by partially overlapping the light-receiving surface Q1 of the first solar cell 2101 and the backlighting surface Q2 of the second solar cell 2102, or by setting the side of the first solar cell 2101 near the second solar cell 2102 and the side of the second solar cell 2102 near the first solar cell 2101 to at least partially adhere to each other. This can meet different needs and improve the flexibility of the solar cell 210 configuration.

[0054] Figure 5 This is a schematic diagram showing the connection relationship between the first and second solar cells. In some examples, such as... Figure 5 As shown, the back surface Q2 of any solar cell 210 is provided with multiple pads 211, including positive electrode pads 2111 and negative electrode pads 2112.

[0055] For example, such as Figure 5As shown, multiple positive electrode pads 2111 can be arranged in a row along the first direction X, and the back surface Q2 of the solar cell 210 can be provided with multiple rows of positive electrode pads 2111. Multiple negative electrode pads 2112 can be arranged in a row along the first direction X, and the back surface Q2 of the solar cell 210 can be provided with multiple rows of negative electrode pads 2112. Along the second direction Y, the multiple rows of positive electrode pads 2111 and the multiple rows of negative electrode pads 2112 can be arranged alternately.

[0056] Continue to refer to Figure 5 Along the first direction X, the positive electrode pad 2111 of the first solar cell 2101 and the negative electrode pad 2112 of the second solar cell 2102 are arranged in a row, and the negative electrode pad 2112 of the first solar cell 2101 and the positive electrode pad 2111 of the second solar cell 2102 are arranged in a row.

[0057] Combination Figure 1 and Figure 5 In some examples, the solder ribbon 220 is located on the side where the back surface Q2 of the solar cell 210 is located. The solder ribbon 220 includes multiple solder ribbon segments 221, which are arranged along the first direction X. Any solder ribbon segment 221 is connected to the positive electrode pad 2111 of the first solar cell 2101 and the negative electrode pad 2112 of the second solar cell 2102.

[0058] For example, the solder strip 220 can be tin-plated copper strip, tin-plated copper-clad aluminum strip, or other metal materials. The embodiments of this application do not further limit the material of the solder strip 220. There can be multiple solder strips 220, which can be spaced apart along the second direction Y. Each solder strip 220 includes multiple solder strip segments 221.

[0059] Understandably, multiple solder strip segments 221 are arranged along the first direction X, and any one solder strip segment 221 is connected to the positive electrode pad 2111 of the first solar cell 2101 and the negative electrode pad 2112 of the second solar cell 2102, so that multiple solar cells 210 arranged along the first direction X can be connected in series through multiple solder strip segments 221.

[0060] In some possible cases, during the fabrication of the photovoltaic module 200, multiple solder strips 221 can be soldered to the positive electrode pad 2111 of the first solar cell 2101 and the negative electrode pad 2112 of the second solar cell 2102, respectively. However, since there are a large number of solar cells 210, soldering the solder strips 221 to the positive electrode pad 2111 of the first solar cell 2101 and the negative electrode pad 2112 of the second solar cell 2102 would affect the production efficiency of the photovoltaic module 200.

[0061] Figure 6This is a schematic diagram showing the connection relationship between the solder strip and the solar cell before disconnection, provided for some embodiments of this application.

[0062] In some examples, such as Figure 6 As shown, after the solar cells 210 are arranged, the solder ribbon 220 and the back surface Q2 of the solar cells 210 can be bonded and fixed with adhesive. Then, the solder ribbon 220 is broken to form multiple solder ribbon segments 221, allowing any one of these segments to connect to the positive electrode pad 2111 of the first solar cell 2101 and the negative electrode pad 2112 of the second solar cell 2102. Understandably, Figure 6 The location where the solder strip 220 was broken is indicated by an "×".

[0063] Understandably, using this method of breaking the solder strip 220 to form the solder strip segment 221 can improve the production efficiency of the photovoltaic module 200.

[0064] For example, the solder strip 220 can be broken by laser, or other methods can be used to break the solder strip 220. The method of breaking the solder strip 220 in the embodiments of this application is not further limited.

[0065] However, the bonding between the solder ribbon 220 and the back surface Q2 of the solar cell 210 can easily damage the solar cell 210 during the process of breaking the solder ribbon 220, thus affecting the production yield of the photovoltaic module 200.

[0066] Based on this, in the embodiments of this application, see... Figure 1 , Figure 3 and Figure 4 The photovoltaic module 200 also includes a first fixing adhesive 231, at least a portion of which is disposed between the end of the solder ribbon segment 221 and the back light surface Q2 of the solar cell 210. The first fixing adhesive 231 bonds the end of the solder ribbon segment 221 and the back light surface Q2 of the solar cell 210.

[0067] Understandably, the first fixing adhesive 231 is disposed between the solder ribbon 220 (the end of the solder ribbon segment 221) and the backlight surface Q2 of the solar cell 210, so that the first fixing adhesive 231 can bond the solder ribbon 220 to the solar cell 210, reducing the risk of the solder ribbon 220 shifting relative to the solar cell 210 during the welding process.

[0068] During the process of breaking the solder ribbon 220, the solder ribbon 220 can be broken at the location of the first fixing adhesive 231, so that at least a portion of the first fixing adhesive 231 can be disposed between the end of the solder ribbon segment 221 and the backlight surface Q2 of the solar cell 210.

[0069] Understandably, breaking the solder ribbon 220 at the location of the first fixing adhesive 231 allows the first fixing adhesive 231 to protect the solar cell 210, reducing the damage to the solar cell 210 caused by the breaking of the solder ribbon 220, and improving the production yield of the photovoltaic module 200.

[0070] In other words, in the embodiments of this application, the first adhesive 231 not only serves to bond and fix the solar cells 210, but also protects the solar cells 210 during the breaking of the solder ribbon 220, thereby improving the production yield of the photovoltaic module 200. Reusing the first adhesive 231 as the adhesive for the solar cells 210 eliminates the need for additional adhesives, simplifying the structure of the photovoltaic module 200 and reducing its cost.

[0071] For example, the shape of the first adhesive 231 in the XY plane (the plane containing the first direction X and the second direction Y) can be a quadrilateral, a hexagon, or a circle. The shape of the first adhesive 231 in the XY plane can also be other regular or irregular shapes. The embodiments of this application do not further limit the shape of the first adhesive 231 in the XY plane.

[0072] In some examples, such as Figure 1 As shown, the width of the first fixing adhesive 231 along the second direction Y is greater than the width of the solder strip 220 along the second direction Y.

[0073] This configuration ensures the protective effect of the first fixing adhesive 231 on the solar cell 210 and improves the bonding effect of the first fixing adhesive 231 on the solder ribbon 220, which is beneficial to improving the production yield of the photovoltaic module 200.

[0074] In some examples, the width of the solder strip 220 along the second direction Y is greater than or equal to 0.1 mm.

[0075] For example, the width of the solder strip 220 along the second direction Y can be 0.2mm, 0.3mm, 0.4mm, 0.5mm or 0.6mm, etc. It is understood that the embodiments of this application do not further limit the value of the width of the solder strip 220 along the second direction Y.

[0076] Setting the width of the solder strip 220 along the second direction Y to be greater than or equal to 0.1 mm can prevent the width of the solder strip 220 along the second direction Y from being too small (e.g., less than 0.1 mm), which is beneficial to improving the conductivity of the solder strip 220.

[0077] In some examples, the width of the solder strip 220 along the second direction Y can range from 0.1 mm to 0.6 mm.

[0078] Setting the width of the solder strip 220 along the second direction Y to a range of 0.1mm to 0.6mm can prevent the width of the solder strip 220 along the second direction Y from being too large (e.g., greater than 0.6mm), thus avoiding excessive shading of the backlight surface Q2 by the solder strip 220.

[0079] For example, the difference between the width of the first fixing adhesive 231 along the second direction Y and the width of the solder strip 220 along the second direction Y can be 0.1mm, 0.2mm, 0.3mm or 0.4mm, etc. The embodiments of this application do not further limit the value of the difference between the width of the first fixing adhesive 231 along the second direction Y and the width of the solder strip 220 along the second direction Y.

[0080] For example, the thickness of the solder strip 220 can range from 0.05mm to 0.5mm. For instance, the thickness of the solder strip 220 can be 0.1mm, 0.2mm, 0.3mm, or 0.4mm, etc. The embodiments of this application do not further limit the thickness of the solder strip 220.

[0081] In some examples, the solder ribbon 220 is broken into multiple solder ribbon segments 221 by a laser, the length of the first fixing adhesive 231 along the first direction X is greater than the diameter of the laser beam, and the width of the first fixing adhesive 231 along the second direction Y is greater than the diameter of the laser beam.

[0082] Understandably, setting the welding strip 220 to be broken into multiple welding strip segments 221 by the laser can improve the convenience of breaking the welding strip 220.

[0083] Setting the length of the first fixing adhesive 231 along the first direction X to be greater than the diameter of the laser beam, and the width of the first fixing adhesive 231 along the second direction Y to be greater than the diameter of the laser beam, can ensure the protective effect of the first fixing adhesive 231 on the solar cell 210, which is conducive to improving the production yield of the photovoltaic module 200.

[0084] In some examples, the thickness of the first fixative 231 ranges from 5 micrometers (μm) to 5000 micrometers.

[0085] Setting the thickness of the first fixing adhesive 231 to a range of 5μm to 5000μm can avoid the thickness of the first fixing adhesive 231 being too large (e.g., greater than 5000μm), thereby reducing the risk that the first fixing adhesive 231 will raise the solder ribbon segment 221, causing the solder ribbon segment 221 to be unable to be soldered to the solder pad 211, and reducing the impact of the first fixing adhesive 231 on the soldering between the solder ribbon segment 221 and the solder pad 211.

[0086] Furthermore, setting the thickness of the first fixing adhesive 231 to a range of 5μm to 5000μm can also prevent the thickness of the first fixing adhesive 231 from being too small (for example, less than 5μm), ensuring the protective effect of the first fixing adhesive 231 on the solar cell 210, and helping to improve the production yield of the photovoltaic module 200.

[0087] For example, the thickness of the first fixing adhesive 231 can be 20μm, 100μm, 150μm, 300μm or 400μm, etc. The embodiments of this application do not further limit the thickness of the first fixing adhesive 231.

[0088] In some examples, such as Figure 3 , Figure 4 and Figure 5 As shown, the solar cell 210 includes a first edge L1 and a second edge L2 disposed opposite to each other along a first direction X.

[0089] Of the multiple pads 211, the pad closest to the first edge L1 along the first direction X is designated as the first pad 211a, and the pad closest to the second edge L2 along the first direction X is designated as the second pad 211b. Understandably, the first pad 211a can be either a positive pad 2111 or a negative pad 2112. Similarly, the second pad 211b can be either a positive pad 2111 or a negative pad 2112.

[0090] like Figure 5 As shown, there are multiple first adhesive adhesives 231. Along the first direction X, a portion (one, two, or more) of the multiple first adhesive adhesives 231 are disposed between the first pad 211a and the first edge L1. When there are multiple first adhesive adhesives 231 disposed between the first pad 211a and the first edge L1, the multiple first adhesive adhesives 231 disposed between the first pad 211a and the first edge L1 can be arranged in a row along the second direction Y. Along the first direction X, another portion (one, two, or more) of the multiple first adhesive adhesives 231 are disposed between the second pad 211b and the second edge L2. When there are multiple first adhesive adhesives 231 disposed between the second pad 211b and the second edge L2, the multiple first adhesive adhesives 231 disposed between the second pad 211b and the second edge L2 can be arranged in a row along the second direction Y.

[0091] For example, the first adhesive 231 disposed between the first pad 211a and the first edge L1 can be referred to as the first first adhesive 231a, and the first adhesive 231 disposed between the second pad 211b and the second edge L2 can be referred to as the second first adhesive 231b.

[0092] like Figure 5As shown, at least one first adhesive 231a can be disposed between the first edge L1 and the positive electrode pad 2111, and at least one second adhesive 231b can be disposed between the second edge L2 and the negative electrode pad 2112.

[0093] For example, such as Figure 5 As shown, one end of the solder ribbon segment 221 can be located on the side of the first first fixing adhesive 231a away from the solar cell 210, and the other end of the solder ribbon segment 221 can be located on the side of the second first fixing adhesive 231b away from the solar cell 210. In this way, the solder ribbon segment 221 can connect with the positive electrode pad 2111 of the first solar cell 2101 and the negative electrode pad 2112 of the second solar cell 2102.

[0094] In some examples, such as Figure 3 As shown, when the light-receiving surface Q1 of the first solar cell 2101 and the back-lighting surface Q2 of the second solar cell 2102 partially overlap, the overlap length of the light-receiving surface Q1 of the first solar cell 2101 and the back-lighting surface Q2 of the second solar cell 2102 along the first direction X is the first length H1, which is less than or equal to 5 mm.

[0095] For example, the value of the first length H1 can be 0.2mm, 0.5mm, 1mm, 2mm, 3mm or 4mm, etc. The embodiments of this application do not further limit the value of the first length H1.

[0096] In some examples, the distance between the first adhesive 231 (i.e., the first first adhesive 231a) and the first edge L1 located between the first pad 211a and the first edge L1 in the first direction X is greater than the first length H1 and less than or equal to 10 mm.

[0097] The distance between the first adhesive 231 (second first adhesive 231b) and the second edge L2, which is located between the second pad 211b and the second edge L2, is greater than the first length H1 and less than or equal to 10 mm in the first direction X.

[0098] Understandably, the distance between the first adhesive 231a and the first edge L1 in the first direction X is the distance between the side of the first adhesive 231a closest to the first edge L1 and the first edge L1 in the first direction X. The distance between the second adhesive 231b and the second edge in the first direction X is the distance between the side of the second adhesive 231b closest to the second edge L2 and the second edge L2 in the first direction X.

[0099] Setting the distance between the first first fixing adhesive 231a and the first edge L1 in the first direction X to be greater than the first length H1, and the distance between the second first fixing adhesive 231b and the second edge L2 in the first direction X to be greater than the first length H1, can reduce the impact of the stacking arrangement of the first solar cell 2101 and the second solar cell 2102 on the first first fixing adhesive 231a and the second first fixing adhesive 231b.

[0100] Furthermore, setting the distance between the first first adhesive 231a and the first edge L1 in the first direction X to be less than or equal to 10 mm can reduce the mutual influence between the first first adhesive 231a and the first pad 211a. Similarly, setting the distance between the second first adhesive 231b and the second edge L2 in the first direction X to be less than or equal to 10 mm can reduce the mutual influence between the second first adhesive 231b and the second pad 211b.

[0101] In some examples, such as Figure 4 As shown, when the first solar cell 2101 is at least partially bonded to the side of the second solar cell 2102 near the second solar cell 2102 and the side of the second solar cell 2102 near the first solar cell 2101, the distance between the first adhesive 231 (i.e., the first first adhesive 231a) disposed between the first pad 211a and the first edge L1 and the first edge L1 in the first direction X is less than or equal to 10 mm. The distance between the first adhesive 231 (i.e., the second first adhesive 231b) disposed between the second pad 211b and the second edge L2 and the second edge L2 in the first direction X is less than or equal to 10 mm.

[0102] Understandably, setting the distance between the first first adhesive 231a and the first edge L1 in the first direction X to be less than or equal to 10 mm can reduce the mutual influence between the first first adhesive 231a and the first pad 211a. Setting the distance between the second first adhesive 231b and the second edge L2 in the first direction X to be less than or equal to 10 mm can reduce the mutual influence between the second first adhesive 231b and the second pad 211b.

[0103] The distance between the first adhesive 231a and the first edge L1 in the first direction X can be 2mm, 3mm, 4mm, 5mm or 8mm, etc., and the distance between the first adhesive 231a and the first edge L1 in the first direction X can also be 0, that is, the side of the first adhesive 231a closest to the first edge L1 is attached to the first edge L1.

[0104] The distance between the second first adhesive 231b and the second edge L2 in the first direction X can be 2mm, 3mm, 4mm, 5mm or 8mm, etc., and the distance between the second first adhesive 231b and the second edge L2 in the first direction X can also be 0, that is, the side of the second first adhesive 231b close to the second edge L2 is attached to the second edge L2.

[0105] In some examples, the material of the first fixative 231 includes at least one of light-absorbing materials, heat-resistant materials, and reflective materials.

[0106] Understandably, when the first fixative 231 includes a light-absorbing material, it can absorb the remaining energy after the laser breaks the solder ribbon 220. When the first fixative 231 includes a heat-resistant material, it can absorb the heat generated when the laser breaks the solder ribbon 220. When the first fixative 231 includes a reflective material, it can reflect the laser.

[0107] The material of the first fixing adhesive 231 includes at least one of light-absorbing material, heat-resistant material and reflective material, so that the first fixing adhesive 231 can protect the solar cell 210 during the laser breaking the solder ribbon 220, reduce the risk of the laser damaging the solar cell 210 when breaking the solder ribbon 220, and help improve the production yield of photovoltaic module 200.

[0108] For example, the first fixative 231 may include a polymer material, such as an adhesive material of epoxy, acrylic, silicone, etc., so that the heat resistance temperature of the first fixative 231 can reach about 200 degrees Celsius.

[0109] Alternatively, the first fixative 231 may also include other materials, such that the heat resistance temperature of the first fixative 231 can reach about 300°C.

[0110] For example, the first fixative 231 may include a matrix and a filler, which are mixed to form the first fixative 231.

[0111] The matrix may include at least one of polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), black polyimide (PI) fixative, low-shrinkage acrylate, and epoxy acrylate.

[0112] The filler may include at least one of ceramic powder, high-pigment carbon black, magnetite (chemical formula Fe3O4), samarium-doped lutetium aluminum garnet (Sm:LuAG) transparent ceramic, 3,3',5,5'-tetramethylbenzidine (TMB) oxide derivative, near-infrared absorbing dyes (e.g., phosphine, phthalocyanine or polyene) and near-green absorbing dyes (cyanine dyes or phthalocyanine dyes).

[0113] For example, magnetite can absorb laser light with a wavelength of 532 nm (nanometers), while Sm:LuAG transparent ceramics and TMB oxide derivatives can absorb laser light with a wavelength of 1064 nm. Near-infrared absorbing dyes can absorb laser light with a wavelength of 1064 nm, and near-green absorbing dyes can absorb laser light with a wavelength of 532 nm.

[0114] For example, the surface of the first adhesive 231 on the side away from the solar cell 210 can be a matte or off-white surface.

[0115] Figure 7 This diagram illustrates the positional relationship between the first fixing adhesive, the solder ribbon, the solar cell, and the second fixing adhesive, as provided in some embodiments of this application. For example, ... Figure 7 As shown, the photovoltaic module 200 may also include a second fixing adhesive 232, which may be disposed on the side of the solder ribbon 220 away from the solar cell 210, or the second fixing adhesive 232 may also be disposed on the side of the solder ribbon 220 close to the solar cell 210.

[0116] The second adhesive 232 can extend along the second direction Y to bond and fix the plurality of solder ribbon segments 221 arranged along the second direction Y to the backlight surface Q2 of the solar cell 210. There can be multiple second adhesives 232, and the multiple second adhesives 232 can be arranged at intervals along the first direction X.

[0117] Figure 8 This is a flowchart illustrating the steps of a photovoltaic module fabrication method provided in some embodiments of this application. On the other hand, embodiments of this application provide a method for fabricating a photovoltaic module. For example... Figure 8 As shown, the method for manufacturing photovoltaic modules includes:

[0118] Step S1: Form a first fixing adhesive on the back surface of the solar cell.

[0119] For example, a first fixing adhesive 231 can be formed on the back surface Q2 of the solar cell 210 by printing or dispensing.

[0120] Step S2: The solder ribbon is laid on the back surface of multiple solar cells, and the solder ribbon is bonded to the back surface of the solar cells by the first fixing adhesive.

[0121] Step S3: Weld the solder strip to the pads of multiple solar cells.

[0122] Figure 9 These are schematic diagrams illustrating the laying and welding of solder strips according to some embodiments of this application. Examples include... Figure 9 As shown, multiple solar cells 210 can be laid on the outer periphery of the roller 301 by stacking, and then the welding ribbon 220 is wrapped around the back surface Q2 of the multiple solar cells 210, so that the welding ribbon 220 can be bonded and fixed to the back surface Q2 of the solar cells 210 by the first fixing adhesive 231.

[0123] After the solder ribbon 220 is wrapped around the back surface Q2 of multiple solar cells 210, it can be heated by the heating rod 302 so that the solder ribbon 220 can be soldered to the solder pad 211.

[0124] Alternatively, multiple solar cells 210 can be laid on equipment other than the roller 301, and the solder ribbon 220 and solder pad 211 can be soldered using equipment other than the heating rod 302.

[0125] Understandably, the embodiments of this application do not further limit the placement of the plurality of solar cells 210 before welding the solder ribbon 220 and the solder pad 211, nor the welding equipment used during the welding process of the solder ribbon 220 and the solder pad 211.

[0126] Step S4: Break the solder ribbon from the location of the first fixing adhesive to form multiple solder ribbon segments, with the end of any solder ribbon segment located on the side of the first fixing adhesive away from the backlight surface of the solar cell.

[0127] Understandably, breaking the solder ribbon 220 at the location of the first fixing adhesive 231 allows the first fixing adhesive 231 to protect the solar cell 210, reducing the damage to the solar cell 210 caused by the breaking of the solder ribbon 220, and improving the production yield of the photovoltaic module 200.

[0128] In other words, in the embodiments of this application, the first adhesive 231 not only serves to bond and fix the solar cells 210, but also protects the solar cells 210 during the breaking of the solder ribbon 220, thereby improving the production yield of the photovoltaic module 200. Reusing the first adhesive 231 as the adhesive for the solar cells 210 eliminates the need for additional adhesives, simplifying the structure of the photovoltaic module 200 and reducing its cost.

[0129] It is understood that the embodiments of this application do not further limit the execution order of steps S3 and S4.

[0130] In other words, the solder ribbon 220 can be broken at the location of the first setter adhesive 231 before soldering the solder ribbon 220 to the pad 211. Alternatively, the solder ribbon 220 can be broken at the location of the first setter adhesive 231 after soldering the solder ribbon 220 to the pad 211. Or, the solder ribbon 220 can be broken at the location of the first setter adhesive 231 during the soldering process between the solder ribbon 220 and the pad 211.

[0131] For example, the first fixative 231 can be cured before the solder ribbon 220 is broken. Alternatively, the first fixative 231 can be cured during the process of breaking the solder ribbon 220. The first fixative 231 can be a UV-curable adhesive or a thermosetting adhesive, and the embodiments of this application do not further limit the curing method of the first fixative 231.

[0132] For example, before breaking the solder ribbon 220, a second adhesive 232 can be formed on the side of the solder ribbon 220 away from the solar cell 210. The second adhesive 232 can extend along the second direction Y to bond and fix multiple solder ribbon segments 221 arranged along the second direction Y to the back surface Q2 of the solar cell 210. There can be multiple second adhesive 232s, and the multiple second adhesive 232s can be spaced apart along the first direction X.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A photovoltaic module, characterized in that, include: A solar cell, comprising multiple solar cells arranged along a first direction, wherein two adjacent solar cells include a first solar cell and a second solar cell; the light-receiving surface of the first solar cell and the back-lighting surface of the second solar cell partially overlap, or, along the first direction, the side of the first solar cell near the second solar cell and the side of the second solar cell near the first solar cell are at least partially bonded; each solar cell has a plurality of pads on its back-lighting surface, including positive electrode pads and negative electrode pads; A solder ribbon, located on the side of the solar cell where the back surface is located, comprises multiple solder ribbon segments arranged along the first direction, wherein any one of the solder ribbon segments connects the positive electrode pad of the first solar cell and the negative electrode pad of the second solar cell; and, A first fixing adhesive is disposed at least in part between the end of the solder ribbon segment and the back surface of the solar cell, and the solder ribbon segment is formed by breaking the solder ribbon at the location where at least part of the first fixing adhesive is located.

2. The photovoltaic module according to claim 1, characterized in that, The width of the first fixing adhesive along the second direction is greater than the width of the solder strip along the second direction, and the second direction is perpendicular to the first direction.

3. The photovoltaic module according to claim 2, characterized in that, The width of the welding strip along the second direction is greater than or equal to 0.1 mm.

4. The photovoltaic module according to claim 1, characterized in that, The welding strip is broken into multiple welding strip segments by a laser. The length of the first fixing adhesive along the first direction is greater than the diameter of the laser beam, and the width of the first fixing adhesive along the second direction is greater than the diameter of the laser beam. The second direction is perpendicular to the first direction.

5. The photovoltaic module according to claim 1, characterized in that, The thickness of the first fixing adhesive ranges from 5 micrometers to 5000 micrometers.

6. The photovoltaic module according to claim 1, characterized in that, The solar cell includes a first edge and a second edge disposed opposite to each other along the first direction; Of the plurality of pads, the pad closest to the first edge along the first direction is the first pad, and the pad closest to the second edge along the first direction is the second pad; The number of the first fixing adhesives is multiple, and along the first direction, at least one of the first fixing adhesives is disposed between the first pad and the first edge, and at least one of the first fixing adhesives is disposed between the second pad and the second edge.

7. The photovoltaic module according to claim 6, characterized in that, When the light-receiving surface of the first solar cell and the back-lighting surface of the second solar cell partially overlap, the overlap length of the light-receiving surface of the first solar cell and the back-lighting surface of the second solar cell along the first direction is the first length, which is less than or equal to 5 mm. The distance between the first fixing adhesive and the first edge in the first direction is greater than the first length and less than or equal to 10 mm; The distance between the first fixing adhesive and the second edge, which are disposed between the second pad and the second edge, in the first direction is greater than the first length and less than or equal to 10 mm.

8. The photovoltaic module according to claim 6, characterized in that, When the first solar cell is at least partially bonded to the side of the second solar cell near the first solar cell and the side of the second solar cell near the first solar cell, the distance between the first adhesive and the first edge in the first direction is less than or equal to 10 mm, and the distance between the first adhesive and the second edge in the first direction is less than or equal to 10 mm.

9. The photovoltaic module according to any one of claims 1 to 8, characterized in that, The material of the first fixing adhesive includes at least one of light-absorbing materials, heat-resistant materials, and reflective materials.

10. A method for preparing a photovoltaic module, characterized in that, include: A first fixing adhesive is formed on the back surface of the solar cell; The solder ribbon is laid on the back surface of multiple solar cells, and the solder ribbon is bonded to the back surface of the solar cells by the first fixing adhesive. The solder strip and the pads of the plurality of solar cells are soldered together; The solder ribbon is broken at least at the location of the first fixing adhesive to form a plurality of solder ribbon segments, wherein the end of any one of the solder ribbon segments is located on the side of the first fixing adhesive away from the back surface of the solar cell.

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