Gridless photovoltaic modules and devices

Abstract

This utility model relates to the field of photovoltaic technology, specifically to a grid-less photovoltaic module and device. The grid-less photovoltaic module includes solar cells, solder ribbons, and a first carrier film; the solder ribbons are connected to the solar cells; the first carrier film is connected to the solar cells and covers the solder ribbons; the first carrier film has grooves, and the solder ribbons are accommodated within the grooves. By providing grooves on the first carrier film, the grid-less photovoltaic module allows the solder ribbons to be accommodated within the grooves. By connecting the first carrier film and the grooves to the solar cells, the solder ribbons are positioned, preventing displacement and misalignment, and improving the stability of the connection.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and more specifically, to a gridless photovoltaic module and device. Background Technology

[0002] With the rapid development of the photovoltaic industry, zero-busbar (OBB) module technology has become a key research focus due to its advantages such as significantly reducing silver paste usage and improving power generation efficiency. OBB modules effectively reduce the use of traditional busbars by optimizing cell structure design and manufacturing processes, thereby significantly improving overall module performance while reducing material costs.

[0003] However, the existing technology suffers from unstable solder strip connections. Utility Model Content

[0004] The purpose of this invention is to provide a gridless photovoltaic module and device that can improve the stability of the solder strip connection.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] In a first aspect, this utility model provides a grid-free photovoltaic module, comprising:

[0007] Battery cells;

[0008] Solder strips are used to connect the solder strips to the solar cells.

[0009] A first carrier film is attached to the battery cell and covers the solder strip; the first carrier film has a groove in which the solder strip is accommodated.

[0010] In an optional embodiment, there are multiple solder strips and multiple first carrier films, which are arranged parallel to each other and spaced apart along a first direction; all solder strips are connected to the battery cells.

[0011] Each first carrier membrane is connected to a corresponding solder strip and to the battery cell.

[0012] In an optional embodiment, a plurality of second carrier membranes are disposed between any two adjacent first carrier membranes; the plurality of second carrier membranes are disposed parallel to each other and spaced apart along a second direction; each second carrier membrane is connected to a battery cell, and each second carrier membrane is connected to two adjacent first carrier membranes;

[0013] The first direction is perpendicular to the second direction.

[0014] In an optional embodiment, the second carrier membrane is disposed at an angle relative to the first carrier membrane.

[0015] In an optional embodiment, the edge of the second carrier membrane is arc-shaped, serrated, or wavy.

[0016] In an optional embodiment, the edge of the first carrier membrane is arc-shaped, serrated, or wavy.

[0017] In an optional embodiment, the groove depth is H and the diameter of the welding strip is D; wherein, H ≥ D.

[0018] In an optional embodiment, the width of the groove opening is L, and the diameter of the welding strip is D; wherein, L > D.

[0019] In an optional embodiment, the device further includes glass and an adhesive film, the adhesive film being located between the glass and the first carrier film, and the adhesive film being bonded to the battery cell and the first carrier film; the glass is connected to the battery cell and the first carrier film through the adhesive film.

[0020] Secondly, this utility model provides a gridless photovoltaic device, including a photovoltaic frame and the aforementioned gridless photovoltaic module, wherein the photovoltaic frame is connected to the gridless photovoltaic module.

[0021] The beneficial effects of the gridless photovoltaic module and gridless photovoltaic device provided in this embodiment of the present invention include:

[0022] The gridless photovoltaic module provided in this embodiment includes solar cells, solder ribbons, and a first carrier film; the solder ribbons are connected to the solar cells; the first carrier film is connected to the solar cells and covers the solder ribbons; the first carrier film is provided with grooves, and the solder ribbons are accommodated in the grooves.

[0023] The gridless photovoltaic module provided in this embodiment achieves the positioning of the solder ribbon by setting a groove on the first carrier film, so that the solder ribbon can be accommodated in the groove. The first carrier film and the groove are then connected to the solar cell, thereby preventing the position of the solder ribbon from shifting or misaligning and improving the stability of the connection. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the gridless photovoltaic module provided in this embodiment;

[0026] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0027] Figure 3 This is a schematic diagram of the structure of the battery cell, the first carrier film, and the second carrier film provided in this embodiment.

[0028] Icons: 100 - Gridless photovoltaic module; 110 - Solar cell; 120 - Welding strip; 130 - First carrier film; 131 - Groove; 140 - Second carrier film; 150 - Glass; 160 - Encapsulant film. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0034] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0035] In the existing manufacturing process of gridless photovoltaic modules, the carrier film, as a key functional material, primarily functions to ensure the precise positioning of the solder ribbons at predetermined locations, thereby forming a stable electrical connection between the cells and achieving efficient current transmission. However, in existing technologies, the solder ribbons are prone to positional shifts and misalignments, affecting the quality of the module's electrical connection.

[0036] Please refer to Figures 1-3 , Figure 1 This is a schematic diagram of the structure of the gridless photovoltaic module 100 provided in this embodiment; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a schematic diagram of the structure of the battery cell 110, the first carrier film 130, and the second carrier film 140 provided in this embodiment. In the figure, the X direction is the first direction, the Y direction is the second direction, and the first direction and the second direction are perpendicular to each other.

[0037] This utility model embodiment provides a gridless photovoltaic device including interconnected gridless photovoltaic modules 100 and photovoltaic frames. The gridless photovoltaic module 100 includes solar cells 110, solder ribbons 120, and a first carrier film 130. The solder ribbons 120 are connected to the solar cells 110, and the first carrier film 130 is connected to the solar cells 110 and covers the solder ribbons 120. To more accurately position the solder ribbons 120, the first carrier film 130 in this embodiment is provided with a groove 131, and the solder ribbons 120 are accommodated in the groove 131. This prevents the solder ribbons 120 from being connected in the wrong position, which would affect the power generation efficiency of the gridless photovoltaic module 100, improve the stability of the solder ribbon connection, and reduce the offset and misalignment of the solder ribbons 120.

[0038] It should be noted that the cross-section of the groove 131 in this embodiment is triangular; in other embodiments, the cross-section of the groove 131 may also be semi-circular or elliptical, etc., which can be adjusted according to the shape of the welding strip 120.

[0039] In this embodiment, the solder ribbon 120 is cylindrical with a diameter of D, and the groove depth of the groove 131 is H, where H≥D. This avoids the solder ribbon 120 protruding relative to the groove 131, which would cause excessive friction between the solder ribbon 120 and the battery cell 110 when the first carrier film 130, the solder ribbon 120, and the battery cell 110 are connected together, resulting in damage to the battery cell 110.

[0040] In this embodiment, the width of the groove 131 is L, where L > D, so that the solder ribbon 120 can smoothly enter the groove 131, improving the positioning and fixing effect of the solder ribbon 120 and preventing the solder ribbon 120 from shifting or misaligning.

[0041] Furthermore, in this embodiment, there are multiple first carrier films 130 and multiple solder ribbons 120, with each first carrier film 130 connected to the solar cell 110; the multiple first carrier films 130 and multiple solder ribbons 120 correspond one-to-one, with each solder ribbon 120 housed in a corresponding groove 131. This embodiment uses multiple solder ribbons 120 to improve conductivity, thereby increasing the power generation efficiency of the gridless photovoltaic module 100. Each solder ribbon 120 corresponds to one first carrier film 130, ensuring accurate positioning of each solder ribbon 120 and improving connection stability.

[0042] It should be noted that multiple solder ribbons 120 are connected to the solar cell 110 in parallel and spaced intervals along the first direction to avoid contact between the solder ribbons and short circuits. In this embodiment, multiple solder ribbons 120 are connected in series, that is, the two ends of each solder ribbon 120 are connected to two adjacent solder ribbons 120, thereby improving conductivity and power generation efficiency of the gridless photovoltaic module 100. Multiple first carrier films 130 are also arranged in parallel and spaced intervals along the first direction to avoid occupying too much surface area of ​​the solar cell 110 and to improve the light absorption rate of the gridless photovoltaic module 100.

[0043] Based on the above, a plurality of second carrier films 140 are disposed between any two adjacent first carrier films 130. The plurality of second carrier films 140 are disposed parallel to each other and spaced apart along a second direction, and each second carrier film 140 is connected to the battery cell 110. Understandably, in this embodiment, each second carrier film 140 is connected to two adjacent first carrier films 130, thereby interconnecting the plurality of first carrier films 130 and the plurality of second carrier films 140 in a mesh-like manner.

[0044] Because two adjacent first carrier films 130 are spaced apart, and two adjacent second carrier films 140 are spaced apart, the two first carrier films 130 and the two second carrier films 140 can form a gap, so that the first carrier films 130 and the second carrier films 140 do not occupy the entire surface of the solar cell 110, thereby improving the light absorption rate of the gridless photovoltaic module 100 and increasing the power generation and power generation efficiency.

[0045] It should be noted that in this embodiment, the second carrier film 140 is inclined relative to the first carrier film 130 to disperse stress, avoid stress concentration caused by the right-angle design, and improve the stability of the gridless photovoltaic module 100. In this embodiment, the inclination angle of the second carrier film 140 relative to the first carrier film 130 is in the range of 40°-50°.

[0046] Furthermore, the gridless photovoltaic module 100 provided in this embodiment also includes glass 150 and an encapsulating film 160. The encapsulating film 160 is located between the glass 150 and the first carrier film 130, and the encapsulating film 160 is bonded to the solar cell 110 and the first carrier film 130. In this embodiment, the glass 150, the first carrier film 130, and the solar cell 110 are connected together by the encapsulating film 160.

[0047] It should be noted that both sides of the battery cell 110 are connected to the solder ribbon 120, the first carrier film 130, and the second carrier film 140; and both sides of the battery cell 110 can be connected to the glass 150 through the adhesive film 160. That is, there are two adhesive films 160 and two pieces of glass 150, which are used to protect both sides of the battery cell 110, as well as the first carrier film 130, the second carrier film 140 and the solder ribbon 120 on both sides.

[0048] Understandably, in this embodiment, two adjacent first carrier films 130 and two adjacent second carrier films 140 are spaced apart to form a gap, so that the adhesive film 160 can directly contact the battery cell 110 through the gap, thereby improving the stability of the connection.

[0049] In this embodiment, the two ends of the first carrier film 130 are in contact with the edges of the battery cell 110. In the prior art, sufficient contact cannot be achieved between the battery cell and the adhesive film, which can easily cause significant displacement of the battery string during the lamination process, thereby increasing the risk of delamination after lamination.

[0050] Therefore, in this embodiment, the edge of the first carrier film 130 is arc-shaped to increase the contact area between the first carrier film 130 and the adhesive film 160, and at the same time, it helps to disperse stress, resist delamination caused by thermal stress and mechanical stress, and improve the stability of the connection.

[0051] In this embodiment, the edge of part of the second carrier film 140 also contacts the edge of the battery cell 110. Therefore, the edge of the second carrier film 140 is also arc-shaped to increase the contact area between the second carrier film 140 and the adhesive film 160 and improve the stability of the connection.

[0052] In other embodiments, the edges of the first carrier membrane 130 and the second carrier membrane 140 may also be serrated or wavy, which can be set according to the actual situation.

[0053] In summary, this embodiment provides a groove 131 on the first carrier film 130, allowing the solder ribbon 120 to be accommodated within the groove 131. By connecting the first carrier film 130 and the groove 131 to the battery cell 110, the solder ribbon 120 is positioned, preventing displacement and misalignment and improving connection stability. This embodiment also connects multiple first carrier films 130 and multiple second carrier films 140 in a grid pattern, allowing the adhesive film 160 to directly contact the battery cell 110 through gaps, further enhancing connection stability. The second carrier film 140 is inclined relative to the first carrier film 130, which also helps to distribute stress and prevent delamination.

[0054] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A gridless photovoltaic module, characterized in that, include: Battery cell (110); A solder strip (120) is connected to the battery cell (110); A first carrier film (130) is connected to the battery cell (110) and covers the solder ribbon (120); the first carrier film (130) is provided with a groove (131) and the solder ribbon (120) is accommodated in the groove (131).

2. The gridless photovoltaic module according to claim 1, characterized in that, The number of the solder ribbons (120) and the first carrier film (130) are both multiple, and the multiple solder ribbons (120) and the multiple first carrier films (130) are arranged parallel to each other and spaced apart along a first direction; the multiple solder ribbons (120) are all connected to the battery cell (110); Each of the first carrier films (130) is correspondingly connected to one of the solder strips (120) and connected to the battery cell (110).

3. The gridless photovoltaic module according to claim 2, characterized in that, A plurality of second carrier films (140) are disposed between any two adjacent first carrier films (130); the plurality of second carrier films (140) are disposed parallel to each other and spaced apart along a second direction; each second carrier film (140) is connected to the battery cell (110), and each second carrier film (140) is connected to two adjacent first carrier films (130); Wherein, the first direction is perpendicular to the second direction.

4. The gridless photovoltaic module according to claim 3, characterized in that, The second carrier membrane (140) is inclined relative to the first carrier membrane (130).

5. The gridless photovoltaic module according to claim 3, characterized in that, The edges of the second carrier membrane (140) are arc-shaped, serrated, or wavy.

6. The gridless photovoltaic module according to claim 2, characterized in that, The edges of the first carrier membrane (130) are arc-shaped, serrated, or wavy.

7. The gridless photovoltaic module according to any one of claims 1-6, characterized in that, The groove (131) has a depth of H, and the welding strip (120) has a diameter of D; wherein, H ≥ D.

8. The gridless photovoltaic module according to any one of claims 1-6, characterized in that, The width of the groove (131) is L, and the diameter of the welding strip (120) is D; wherein, L > D.

9. The gridless photovoltaic module according to any one of claims 1-6, characterized in that, It also includes glass (150) and an adhesive film (160), the adhesive film (160) being located between the glass (150) and the first carrier film (130), the adhesive film (160) being bonded to the battery cell (110) and the first carrier film (130); the glass (150) being connected to the battery cell (110) and the first carrier film (130) through the adhesive film (160).

10. A gridless photovoltaic device, characterized in that, The photovoltaic frame includes a photovoltaic frame and a gridless photovoltaic module (100) according to any one of claims 1-9, wherein the photovoltaic frame is connected to the gridless photovoltaic module (100).

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