Photovoltaic solder strip and photovoltaic module

Abstract

The embodiment of the invention relates to the field of photovoltaic technology, and provides a photovoltaic welding strip and a photovoltaic module, and the photovoltaic welding strip comprises a non-welding surface which is a plane; the welding face is arranged opposite to the non-welding face in the first direction, the two opposite edges, in the second direction, of the welding face are connected with the two opposite edges, in the second direction, of the non-welding face in a one-to-one correspondence mode, the welding face protrudes in the preset direction, the width of the protrusion in the preset direction is decreased, and the preset direction is the direction pointing from the non-welding face to the welding face; the preset direction is parallel to the first direction, the first direction intersects with the second direction, and the width of the protrusions is perpendicular to the preset direction. The photovoltaic solder strip provided by the embodiment of the invention at least solves the technical problem of low connection strength between the solder strip and the battery piece in the prior art.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic welding ribbon and a photovoltaic module. Background Art

[0002] As a clean, renewable resource, solar energy is gaining increasing importance in the energy sector. As a core component of solar power generation systems, photovoltaic modules' photoelectric conversion efficiency directly impacts the overall system's performance. In photovoltaic modules, the connection between the ribbon and the cell is achieved using solder, adhesive, or a combination of both. Currently, the connection between the ribbon and the cell is weak, making reliability testing of photovoltaic modules prone to failure. Summary of the Invention

[0003] The embodiments of the present application provide a photovoltaic welding ribbon and a photovoltaic module, which at least solve the technical problem of low connection strength between the welding ribbon and the solar cell in the prior art.

[0004] According to some embodiments of the present application, on the one hand, the embodiments of the present application provide a photovoltaic welding strip, comprising: a non-welding surface, which is a plane; a welding surface, which is arranged opposite to the non-welding surface along a first direction, and the two edges of the welding surface opposite to each other along a second direction are connected one-to-one with the two edges of the non-welding surface opposite to each other along the second direction, the welding surface is raised along a predetermined direction, and the width of the raised portion decreases along the predetermined direction, the predetermined direction is a direction from the non-welding surface to the welding surface, the predetermined direction is parallel to the first direction, the first direction intersects with the second direction, and the width of the raised portion is perpendicular to the predetermined direction.

[0005] In some embodiments, the welding surface is a curved surface.

[0006] In some embodiments, the eccentricity of the arc surface is greater than or equal to 0 and less than 1.

[0007] In some embodiments, the welding surface includes a plurality of surfaces whose edges are connected in sequence, the edge of a first surface among the plurality of surfaces is connected to one of the two edges opposite to the non-welding surface, and the edge of a last surface among the plurality of surfaces is connected to the other of the two edges opposite to the non-welding surface.

[0008] In some embodiments, the plurality of surfaces satisfy one of the following conditions: at least a portion of the plurality of surfaces are arc surfaces; and the plurality of surfaces are all planes.

[0009] In some embodiments, there are three surfaces, namely a first surface, a second surface and a third surface whose edges are connected in sequence, one edge of the non-welding surface is connected to the first surface, and another edge of the non-welding surface is connected to the third surface. The non-welding surface is arranged opposite to the second surface, and the width of the non-welding surface along the second direction is greater than the width of the second surface along the second direction.

[0010] In some embodiments, the first surface, the second surface, and the third surface are all planes, and the non-welding surface, the first surface, the second surface, and the third surface form a tetrahedron with an inverted trapezoidal cross section.

[0011] In some embodiments, there are seven surfaces, and the non-welding surface and the seven surfaces form an octahedron with an inverted convex U-shaped cross section.

[0012] In some embodiments, the photovoltaic welding ribbon satisfies at least one of the following conditions: the maximum distance between the non-welding surface and the welding surface is 0.01 to 10 mm; and the width of the non-welding surface is 0.01 to 30 mm.

[0013] According to some embodiments of the present application, another aspect of the embodiments of the present application provides a photovoltaic module, comprising: a cell having a connection area on the surface of the cell; any one of the photovoltaic welding strips, located on one side of the cell, the welding surface of the photovoltaic welding strip facing the connection area; a conductive material, located between the connection area and the welding surface, and respectively in contact with the connection area and the welding surface.

[0014] The technical solution provided by the embodiments of the present application has at least the following advantages: in the photovoltaic welding strip of the present application, the welding surface and the non-welding surface are arranged opposite to each other, the non-welding surface is a plane, the welding surface is convex in the direction away from the non-welding surface, and the width of the convexity is getting smaller and smaller. In other words, in the photovoltaic module, the width of the welding surface of the photovoltaic welding strip is getting smaller and smaller in the direction close to the battery cell, so that the space for setting solder or adhesive between the welding surface and the battery cell is getting larger and larger along the direction close to the battery cell, so that a larger volume of solder or adhesive can be set between the welding surface of the photovoltaic welding strip and the battery cell, ensuring that the connection strength between the photovoltaic welding strip and the battery cell is greater; and, more solder or adhesive makes the contact area between the solder or adhesive and the photovoltaic welding strip larger, further ensuring that the connection strength between the photovoltaic welding strip and the battery cell is greater, and solves the problem that the volume of solder or adhesive retained between the photovoltaic welding strip and the battery cell after welding or bonding is small, resulting in a lower connection strength between the welding strip and the battery cell, thereby affecting the connection reliability of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] One or more embodiments are exemplified by the figures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise stated, the figures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present application or the technical solutions in the traditional technology, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 Schematic diagram of the cross-sectional structure of an existing photovoltaic module;

[0017] Figure 2 A schematic cross-sectional view of a photovoltaic module provided in one embodiment of the present application;

[0018] Figure 3 A schematic cross-sectional view of another photovoltaic module provided in one embodiment of the present application;

[0019] Figure 4 This is a schematic cross-sectional structure diagram of another photovoltaic module provided in an embodiment of the present application.

[0020] The above drawings include the following reference numerals:

[0021] 10′, photovoltaic welding ribbon; 13′, battery cell; 14′, conductive material; 10, photovoltaic welding ribbon; 11, non-welding surface; 12, welding surface; 13, battery cell; 14, conductive material. DETAILED DESCRIPTION

[0022] As can be seen from the background art, in the prior art, the connection strength between the soldering ribbon and the solar cell is relatively low, resulting in the problem of poor reliability of the photovoltaic module.

[0023] The inventors discovered that Figure 1 As shown, the edge of the traditional photovoltaic welding ribbon 10' is parallel to the plane of the battery cell 13', resulting in a smaller space between the photovoltaic welding ribbon 10' and the battery cell 13'. After welding or bonding with a conductive material 14' such as solder or adhesive, the volume of the conductive material 14 such as solder or adhesive retained between the photovoltaic welding ribbon 10' and the battery cell 13' is smaller, resulting in the above problems.

[0024] In order to solve the above problems, the embodiments of the present application provide a photovoltaic welding ribbon and a photovoltaic module.

[0025] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0026] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0028] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0029] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0030] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of these terms in the embodiments of the present application based on specific circumstances.

[0031] In the accompanying drawings corresponding to the embodiments of the present application, the thickness and area of ​​the layers are exaggerated for better understanding and ease of description. When describing a component (such as a layer, film, region or substrate) on another component or on the surface of another component, the component can be "directly" located on the surface of the other component, or there can be a third component between the two components. On the contrary, when describing a component on the surface of another component or when another component is formed or provided on the surface of a component, it means that there is no third component between the two components. In addition, when describing a component as "approximately" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a partial edge of the entire surface.

[0032] In the description of the embodiments of the present application, when a component "includes" another component, unless otherwise specified, other components are not excluded, and other components may be further included. In addition, when a component such as a layer, film, region, or plate is referred to as being "on / located on" another component, it can be "directly on" the other component (i.e., located on the surface of the other component with no other components between them), or another component may be present between them. In addition, when a component such as a layer, film, region, or plate is "directly located on" another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it means that no other components are located therebetween.

[0033] The terms used herein in the description of the various embodiments are intended only to describe the specific embodiments and are not intended to be limiting. As used in the description of the various embodiments and the appended claims, "part" is intended to include the plural form unless the context clearly indicates otherwise. A component includes a layer, film, region, or plate.

[0034] The following detailed description of the various embodiments of the present application is provided in conjunction with the accompanying drawings. However, those skilled in the art will appreciate that many technical details are provided in the various embodiments of the present application to facilitate a better understanding of the present application. However, even without these technical details and the various variations and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented.

[0035] On the one hand, an embodiment of the present application provides a photovoltaic welding ribbon. Figure 2 、 Figure 3 as well as Figure 4 The cross-sectional structural diagrams of three photovoltaic welding ribbons according to the embodiments of the present application are shown as follows: Figures 2 to 4 As shown, the photovoltaic ribbon 10 includes:

[0036] A non-welding surface 11, wherein the non-welding surface 11 is a plane;

[0037] Specifically, the non-welding surface 11 refers to a surface that is not welded to the battery cell.

[0038] The welding surface 12 is arranged opposite to the non-welding surface 11 along a first direction, and the two edges of the welding surface 12 opposite to each other along a second direction are connected one-to-one with the two edges of the non-welding surface 11 opposite to each other along the second direction. The welding surface 12 is raised along a predetermined direction, and the width of the raised portion decreases along the predetermined direction. The predetermined direction is the direction from the non-welding surface 11 to the welding surface 12. The predetermined direction is parallel to the first direction, the first direction intersects with the second direction, and the width of the raised portion is perpendicular to the predetermined direction.

[0039] Specifically, the welding surface 12 is the surface that is welded to the battery cell. The welding surface 12 is not a flat surface. In some embodiments, the welding surface 12 may include a single arc surface; multiple connected arc surfaces; multiple connected flat surfaces; or at least one arc surface and at least one flat surface adjacent to the arc surface. In some embodiments, the first direction may be perpendicular to the second direction.

[0040] Through the described embodiments, in the photovoltaic welding strip of the present application, the welding surface and the non-welding surface are arranged opposite to each other, the non-welding surface is a plane, the welding surface is convex in the direction away from the non-welding surface, and the width of the convexity is getting smaller and smaller. In other words, in the photovoltaic module, the width of the welding surface of the photovoltaic welding strip is getting smaller and smaller in the direction close to the battery cell, so that the space for setting solder or adhesive between the welding surface and the battery cell is getting larger and larger along the direction close to the battery cell, so that a larger volume of solder or adhesive can be set between the welding surface of the photovoltaic welding strip and the battery cell, ensuring that the connection strength between the photovoltaic welding strip and the battery cell is greater; and, more solder or adhesive makes the contact area between the solder or adhesive and the photovoltaic welding strip larger, further ensuring that the connection strength between the photovoltaic welding strip and the battery cell is greater, and solves the problem that the volume of solder or adhesive retained between the photovoltaic welding strip and the battery cell after welding or bonding is small, resulting in a lower connection strength between the welding strip and the battery cell, thereby affecting the connection reliability of the photovoltaic module.

[0041] In some optional solutions, the photovoltaic ribbon is a component that transmits current in a photovoltaic module, and its main function is to transmit and collect current. The photovoltaic ribbon can be composed of a substrate and a coating attached to the substrate. The main function of the substrate is to conduct electricity, and the main function of the coating is to make the photovoltaic ribbon weldable, so that the photovoltaic ribbon can be connected to the grid line of the battery cell by welding. The material of the substrate can be copper, which has a low resistivity and a strong current carrying capacity. The material of the coating can be a tin alloy, and the coating material is evenly coated on the surface of the substrate by processes such as electroplating, vacuum deposition or spraying. The photovoltaic ribbon provided in the embodiment of the present application can be manufactured by an integrated molding method, thereby reducing the subsequent welding steps, and the integrated molding can improve the connection reliability of the photovoltaic ribbon and the busbar, battery cell, etc., so that the two have good electrical connection stability even with a smaller connection area. For example, during processing, the substrate of the photovoltaic ribbon can be produced by an integrated molding method, and then a coating is set on the surface of the substrate to achieve integrated molding.

[0042] In some embodiments, as Figure 2 As shown, the welding surface is a curved surface. Compared with a flat surface, the curved surface used in this embodiment allows for a larger space between the welding surface and the cell, further ensuring that more solder or adhesive can be filled between the two, thereby further ensuring the welding reliability between the photovoltaic ribbon and the cell.

[0043] Illustratively, the welding surface may be a circular arc surface, an elliptical arc surface, a parabolic arc surface, a Bezier arc surface, or a compound arc surface.

[0044] For the arc welding surface, when welding with the battery cell, the conductive material such as solder or adhesive can be coated on the entire arc surface, or only on a part of the arc surface.

[0045] In some optional solutions, when the arc surface is a circular arc surface, the cross-sectional shape of the photovoltaic ribbon 10 can be a 1 / 2 circular shape, a 1 / 3 circular shape, or a 2 / 3 circular shape. When the arc surface is an elliptical arc surface, the cross-sectional shape of the photovoltaic ribbon 10 can be a 1 / 2 elliptical shape, a 1 / 3 elliptical shape, or a 2 / 3 elliptical shape.

[0046] According to some optional embodiments of the present application, the eccentricity of the arc surface is greater than or equal to 0 and less than 1. For example, the eccentricity of the arc surface can be 0, 0.2, 0.5, 0.7, or 0.9. This design can balance the connection reliability and stability of the photovoltaic ribbon, allowing it to further provide a larger volume of solder or adhesive between the welding surface of the photovoltaic ribbon and the solar cell during welding, thereby further ensuring the connection strength between the photovoltaic ribbon and the solar cell; it can also ensure the high flexibility and stability of the photovoltaic ribbon, avoiding the risk of breakage of the photovoltaic ribbon due to excessive bending.

[0047] Specifically, by precisely controlling the eccentricity, PV ribbons can achieve optimal welding results across a wide range of cell surface conditions, improving the production yield and performance consistency of PV modules. The eccentricity adjustment range allows for flexibility and applicability optimization based on the material and thickness of the PV ribbon.

[0048] In some other embodiments, Figure 3 and Figure 4 As shown, the welding surface includes multiple surfaces with edges connected in sequence, the edge of a first surface among the multiple surfaces being connected to one of the two edges opposite the non-welding surface, and the edge of a last surface among the multiple surfaces being connected to the other of the two edges opposite the non-welding surface. By splicing multiple connected surfaces into a welding surface, the connection characteristics between the photovoltaic ribbon and the cell can be further optimized. This design not only allows for a larger space for solder or adhesive to be placed between the welding surface and the cell, thereby increasing the number of contact points between the solder or adhesive and the photovoltaic ribbon support, further improving the strength of the weld, but also allows the photovoltaic ribbon to have better adaptability in different directions, thereby further ensuring a high-quality welding effect between the photovoltaic ribbon and the cell.

[0049] In actual applications, in the embodiments described above, each surface of the soldering surface can be independently designed as a flat surface or a curved surface. By configuring the shapes of multiple surfaces, the solder or adhesive can be more evenly distributed between the photovoltaic ribbon and the solar cell. Those skilled in the art can flexibly configure the number of surfaces, for example, the number of surfaces can be 2, 3, 4, 5, 6, 7, or even more.

[0050] For the welding surface comprising multiple surfaces, when welding to the battery cell, a conductive material such as solder or adhesive may be coated on each of the surfaces. For example, the conductive material covers each surface. For another example, the conductive material covers all surfaces except the first and last surfaces, and covers part of the first surface and part of the last surface. For the welding surface comprising multiple surfaces, when welding to the battery cell, a conductive material such as solder or adhesive may also be coated on part of the surfaces. For example, the conductive material covers all surfaces except the first and last surfaces, but does not cover the first and last surfaces.

[0051] Illustratively, in this embodiment, the plurality of surfaces satisfy one of the following: at least part of the plurality of surfaces are arcuate surfaces; and the plurality of surfaces are all planes. The embodiment includes the following three cases: first, all of the surfaces are arcuate surfaces; second, part of the plurality of surfaces are arcuate surfaces, and the remaining surfaces are planes; and third, all of the surfaces are planes. In all three cases, the surface where the photovoltaic ribbon contacts the cell is generally an inverted arc-shaped surface or an inverted trapezoidal surface. The space between the photovoltaic ribbon and the cell is larger, and more solder or adhesive can be retained between the two, thereby increasing the contact area between the photovoltaic ribbon, the cell and the solder or adhesive, respectively, which is beneficial to improving the stability of the connection. In the reliability test of photovoltaic modules, this enhanced connection can reduce failures caused by poor welding and improve the overall performance and life of the photovoltaic module.

[0052] In some embodiments, there are three surfaces, namely a first surface, a second surface, and a third surface, each having edges connected in sequence. One edge of the non-welding surface is connected to the first surface, and another edge of the non-welding surface is connected to the third surface. The non-welding surface is disposed opposite the second surface, and the width of the non-welding surface along the second direction is greater than the width of the second surface along the second direction. In this embodiment, the photovoltaic ribbon is wide at the top and narrow at the bottom along the predetermined direction. Compared to an arrangement in which the edges of the ribbon are parallel to the plane of the solar cell, this embodiment further ensures that there is a larger space between the welding surface of the photovoltaic ribbon and the solar cell for disposing solder or adhesive. This allows for a larger amount of solder or adhesive to be disposed between the welding surface of the photovoltaic ribbon and the solar cell, thereby further enhancing the connection reliability between the photovoltaic ribbon and the solar cell, thereby further ensuring the connection performance and service life of the photovoltaic module.

[0053] It should be noted that the phrase "the non-welding surface is disposed opposite the second surface" means that the non-welding surface and the second surface are disposed opposite each other along the predetermined direction. If the second surface is also planar, the non-welding surface is parallel to the second surface. Furthermore, the first, second, and third surfaces can independently be planar or curved.

[0054] In some embodiments, as Figure 3 As shown, the first surface, the second surface, and the third surface are all planes, and the non-welding surface, the first surface, the second surface, and the third surface form a tetrahedron with an inverted trapezoidal cross-section. In other words, the cross-section of the photovoltaic ribbon is inverted trapezoidal. Solder or adhesive can connect the cell to the first surface, the cell to the second surface, and the cell to the third surface, respectively, further enhancing the connection strength between the cell and the photovoltaic ribbon, resulting in a better connection between the cell and the photovoltaic ribbon.

[0055] In some other exemplary embodiments, Figure 4 As shown, there are seven surfaces, and the non-welding surface and the seven surfaces form an octahedron with an inverted convex U-shaped cross-section. In other words, the cross-section of the photovoltaic ribbon is in the shape of an inverted convex U-shaped cross-section. In this embodiment, the solar cell can be connected to each of the seven surfaces using solder or adhesive, further increasing the contact area between the solar cell and the welding surface, thereby further improving the welding strength between the solar cell and the photovoltaic ribbon.

[0056] It should be noted that each of the seven surfaces can be independently designed as a flat or curved surface. In the case of an inverted U-shaped photovoltaic ribbon, as the distance between the welding surface and the cell decreases, the width of the welding surface also gradually decreases. In other words, the distance between the welding surface and the cell and the width of the welding surface are inversely proportional. Furthermore, in the case of an inverted U-shaped photovoltaic ribbon, as the distance between the welding surface and the cell decreases, the width of the welding surface can also exhibit a trend of initially remaining constant, then decreasing, and then remaining constant again.

[0057] In some embodiments, the photovoltaic welding ribbon satisfies at least one of the following: the maximum distance between the non-welding surface and the welding surface is 0.01 to 10 mm, for example, the maximum distance between the non-welding surface and the welding surface can be 0.01 mm, 0.05 mm, 0.1 mm, 1 mm, 3 mm, 5 mm, 7 mm, or 10 mm, etc.; the width of the non-welding surface is 0.01 to 30 mm, for example, the width of the non-welding surface can be 0.01 mm, 0.07 mm, 0.1 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, or 30 mm, etc. Specifically, the width of the non-welding surface refers to the width of the non-welding surface in the second direction. In this embodiment, the maximum distance limit (0.01 to 10 mm) allows sufficient space for the soldering surface to protrude toward the cell, further ensuring that there is more space between the soldering surface and the cell to accommodate solder or adhesive. This helps accommodate more solder or adhesive between the soldering surface and the cell to achieve a reliable electrical connection, further ensuring good contact between the photovoltaic ribbon and the cell during the welding process. The range of the non-welding surface width (0.01 to 30 mm) takes into account the needs of photovoltaic modules of different sizes, ensuring that the size specifications of the photovoltaic ribbon can meet various scenarios and ensure the practicality and wide applicability of the design.

[0058] The embodiment of the present application also provides a photovoltaic module, such as Figures 2 to 4 As shown, the photovoltaic module includes:

[0059] A battery cell 13, wherein a connection area is provided on a surface of the battery cell 13;

[0060] Any of the photovoltaic welding ribbons 10 is located on one side of the cell 13, with the welding surface of the photovoltaic welding ribbon 10 facing the connection area;

[0061] The conductive material 14 is located between the connection area and the welding surface, and the conductive material 14 contacts the connection area and the welding surface respectively.

[0062] Specifically, the cell 13 is electrically connected to the photovoltaic ribbon 10 through the conductive material 14 .

[0063] According to the embodiments, in a photovoltaic module, the connection area between the photovoltaic ribbon and the cell is electrically connected via a conductive material. The welding surface of the photovoltaic ribbon is disposed opposite to the non-welding surface, the non-welding surface being flat, and the welding surface being convex in a direction away from the non-welding surface, with the convex width decreasing. In other words, in the photovoltaic module, the welding surface of the photovoltaic ribbon is narrowed in width as it approaches the cell, thereby increasing the space available for solder or adhesive to be disposed between the welding surface and the cell as it approaches the cell. This allows for a larger volume of solder or adhesive to be disposed between the welding surface of the photovoltaic ribbon and the cell, thereby ensuring a stronger connection between the photovoltaic ribbon and the cell. Furthermore, the larger amount of solder or adhesive allows for a larger contact area between the solder or adhesive and the photovoltaic ribbon, further ensuring a stronger connection between the photovoltaic ribbon and the cell. This solves the problem of a smaller volume of solder or adhesive remaining between the photovoltaic ribbon and the cell after welding or bonding, resulting in a lower connection strength between the photovoltaic ribbon and the cell, thereby affecting the connection reliability of the photovoltaic module. This ensures a higher connection reliability and a longer service life for the photovoltaic module.

[0064] Specifically, the conductive material may be solder, such as solder paste, etc.; the conductive material may also be an adhesive, such as conductive putty, etc.

[0065] Exemplarily, the types of photovoltaic modules include but are not limited to TOPCon (Tunnel Oxide Passivated Contact) photovoltaic modules, BC (Back Contact) photovoltaic modules, OBB (Zero Busbar) photovoltaic modules, HTJ (Heterojunction) photovoltaic modules, HBC (Heterojunction with Back Contact) photovoltaic modules, and TBC (Tunnel Oxide Passivated Back Contact) photovoltaic modules, etc.

[0066] From the above description, it can be seen that the embodiments described in this application achieve the following technical effects:

[0067] 1) In the photovoltaic welding strip of the present application, the welding surface and the non-welding surface are arranged opposite to each other, the non-welding surface is a plane, the welding surface is raised in the direction away from the non-welding surface, and the width of the raised surface is getting smaller and smaller. In other words, in the photovoltaic module, the width of the welding surface of the photovoltaic welding strip is getting smaller and smaller in the direction close to the battery cell, so that the space for setting solder or adhesive between the welding surface and the battery cell is getting larger and larger along the direction close to the battery cell, so that a larger volume of solder or adhesive can be set between the welding surface of the photovoltaic welding strip and the battery cell, ensuring that the connection strength between the photovoltaic welding strip and the battery cell is greater; and, more solder or adhesive makes the contact area between the solder or adhesive and the photovoltaic welding strip larger, further ensuring that the connection strength between the photovoltaic welding strip and the battery cell is greater, and solves the problem that the volume of solder or adhesive retained between the photovoltaic welding strip and the battery cell after welding or bonding is small, resulting in a lower connection strength between the welding strip and the battery cell, thereby affecting the connection reliability of the photovoltaic module.

[0068] 2) The photovoltaic module of the present application includes a cell, a photovoltaic welding ribbon and a conductive material, wherein the connection area between the photovoltaic welding ribbon and the cell is electrically connected through the conductive material. The welding surface and the non-welding surface of the photovoltaic welding ribbon are arranged opposite to each other, the non-welding surface is a plane, the welding surface is convex in the direction away from the non-welding surface, and the width of the convexity is getting smaller and smaller. In other words, in the photovoltaic module, the width of the welding surface of the photovoltaic welding ribbon is getting smaller and smaller in the direction close to the battery cell, so that the space for setting solder or adhesive between the welding surface and the battery cell is getting larger and larger along the direction close to the battery cell, so that a larger volume of solder or adhesive can be set between the welding surface of the photovoltaic welding ribbon and the battery cell, ensuring that the connection strength between the photovoltaic welding ribbon and the battery cell is greater; and, more solder or adhesive makes the contact area between the solder or adhesive and the photovoltaic welding ribbon larger, further ensuring that the connection strength between the photovoltaic welding ribbon and the battery cell is greater, solving the problem that the volume of solder or adhesive retained between the photovoltaic welding ribbon and the battery cell after welding or bonding is small, resulting in lower connection strength between the welding ribbon and the battery cell, thereby affecting the connection reliability of the photovoltaic module, ensuring that the connection reliability of the photovoltaic module is higher and the service life is longer.

[0069] Those skilled in the art will appreciate that the above-described embodiments are specific examples for implementing the present application, and that in actual applications, various changes in form and detail may be made thereto without departing from the spirit and scope of the present application. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined in the claims.

Claims

1. A photovoltaic welding ribbon, characterized in that: include: a non-welding surface, wherein the non-welding surface is a plane; The welding surface is arranged opposite to the non-welding surface along a first direction, and the two edges of the welding surface opposite to each other along a second direction are connected one-to-one with the two edges of the non-welding surface opposite to each other along the second direction. The welding surface is raised along a predetermined direction, and the width of the raised portion decreases along the predetermined direction. The predetermined direction is the direction from the non-welding surface to the welding surface. The predetermined direction is parallel to the first direction, the first direction intersects with the second direction, and the width of the raised portion is perpendicular to the predetermined direction.

2. The photovoltaic welding ribbon according to claim 1, characterized in that: The welding surface is a curved surface.

3. The photovoltaic welding ribbon according to claim 2, characterized in that: The eccentricity of the arc surface is greater than or equal to 0 and less than 1.

4. The photovoltaic welding ribbon according to claim 1, characterized in that: The welding surface includes a plurality of surfaces whose edges are connected in sequence, the edge of a first surface among the plurality of surfaces is connected to one of the two edges opposite to the non-welding surface, and the edge of a last surface among the plurality of surfaces is connected to the other of the two edges opposite to the non-welding surface.

5. The photovoltaic welding ribbon according to claim 4, characterized in that: A plurality of said surfaces satisfy one of the following: At least part of the plurality of surfaces is a curved surface; A plurality of the surfaces are planar.

6. The photovoltaic welding ribbon according to claim 4, characterized in that: There are three surfaces, namely a first surface, a second surface and a third surface whose edges are connected in sequence. One edge of the non-welding surface is connected to the first surface, and the other edge of the non-welding surface is connected to the third surface. The non-welding surface is arranged opposite to the second surface, and the width of the non-welding surface along the second direction is greater than the width of the second surface along the second direction.

7. The photovoltaic welding ribbon according to claim 6, characterized in that: The first surface, the second surface, and the third surface are all planes, and the non-welding surface, the first surface, the second surface, and the third surface form a tetrahedron with an inverted trapezoidal cross section.

8. The photovoltaic welding ribbon according to claim 4, characterized in that: There are seven surfaces, and the non-welding surface and the seven surfaces form an octahedron with an inverted convex cross section.

9. The photovoltaic welding ribbon according to any one of claims 1 to 7, characterized in that: The photovoltaic ribbon satisfies at least one of the following requirements: The maximum distance between the non-welding surface and the welding surface is 0.01 to 10 mm; The width of the non-welding surface is 0.01 to 30 mm.

10. A photovoltaic module, characterized in that: include: A battery cell having a connection area on a surface of the battery cell; The photovoltaic welding ribbon according to any one of claims 1 to 9, located on one side of the solar cell, with the welding surface of the photovoltaic welding ribbon facing the connection area; The conductive material is located between the connection area and the welding surface, and is in contact with the connection area and the welding surface respectively.

Images