A novel interdigitated back contact photovoltaic module

Abstract

This utility model discloses a novel gridless photovoltaic module, including a solar cell with multiple fine grids for current collection arranged on its surface, the grids being laid out in a lotus root shape; a thin film laid on the surface of the fine grids, the surface of which is decorated with multiple UV conductive adhesives; and multiple solder ribbons disposed on the thin film and in contact with the UV conductive adhesives. This novel gridless photovoltaic module increases the contact area with the solder ribbons by using lotus root-shaped fine grids, reducing solder ribbon consumption. The UV conductive adhesive on the thin film enhances the connection between the solder ribbons and the solar cell, and the precise positioning of the solder ribbon connection ensures stable welding between the solder ribbons and the solar cell, facilitating the fabrication of the photovoltaic module. Furthermore, the gridless cell string design reduces solder ribbon consumption while improving conductivity and interconnectivity.

Description

Technical Field

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

[0002] Conventionally, photovoltaic (PV) module cells have a thin layer of silver paste grids printed on their surface, along with multiple silver paste main grid lines perpendicular to these grids. Then, solder ribbons are attached to the main grids using a high-temperature soldering machine. Gridless cells, on the other hand, do not have main grids printed on their surface. This reduces the amount of silver paste used and increases costs. However, the absence of main grids makes positioning the solder ribbons on the cell more difficult, leading to misalignment, which affects both aesthetics and current collection.

[0003] Existing gridless solar cells employ two methods. One method involves printing fixed adhesive dots on the surface of the solar cell and connecting the solder ribbon to these dots, thus establishing a connection between the solar cell, adhesive dots, and solder ribbon. This method requires directly printing the adhesive dots onto the solar cell, which can easily lead to cell contamination. The other method involves initially welding the solder ribbon onto the solar cell using a welding machine, and then applying a layer of UV adhesive over the solder ribbon. After lamination, this connects the solar cell and the solder ribbon. However, this method can result in the solder ribbon not being accurately positioned on the solar cell, which can easily lead to misalignment. Utility Model Content

[0004] The purpose of this invention is to provide a novel gridless photovoltaic module to address the aforementioned shortcomings of the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: including a battery cell,

[0006] The surface of the battery cell is provided with a plurality of fine grids for current collection, which are laid out in a lotus root shape.

[0007] It also includes a thin film, which is laid on the surface of the fine grid, and the surface of the thin film is dotted with multiple UV conductive adhesives;

[0008] It also includes multiple solder strips, which are disposed on the film and in contact with the UV conductive adhesive.

[0009] As a further description of the above technical solution:

[0010] It also includes two busbars, which are electrically connected to multiple welding strips located on the same side.

[0011] As a further description of the above technical solution:

[0012] The solder ribbon and the UV conductive adhesive are hot-pressed together, causing the UV adhesive dots on the film to melt and form an integral part with the solder ribbon.

[0013] As a further description of the above technical solution:

[0014] Multiple solar cells are connected in series using a stringing machine.

[0015] As a further description of the above technical solution:

[0016] Multiple UV conductive adhesives are uniformly distributed on the surface of the film, and multiple UV conductive adhesives are respectively disposed at the intersection of two adjacent lotus root-shaped fine grids.

[0017] As a further description of the above technical solution:

[0018] Multiple solder strips on the side of two adjacent battery cells that are close to each other are welded together.

[0019] In the above technical solution, the novel gridless photovoltaic module provided by this utility model has the following beneficial effects:

[0020] This invention increases the contact area with the solder ribbon by incorporating lotus root-shaped fine grids, reducing solder ribbon consumption by more than 7% on a single solar cell. Furthermore, UV conductive adhesive is applied to the thin film to enhance the connection between the solder ribbon and the solar cell. Precise positioning of the solder ribbon connection ensures stable welding between the ribbon and the solar cell, facilitating the fabrication of photovoltaic modules. Additionally, the design of gridless solar cell strings further reduces solder ribbon consumption while improving conductivity and connectivity.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0022] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0024] Figure 1 This is a schematic diagram of the structure of the battery cell provided in an embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the battery cell covering film provided in an embodiment of the present invention;

[0026] Figure 3This is a schematic diagram of the interconnected structure of multiple battery cells provided in an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Solar cell; 2. Grid; 3. Thin film; 4. UV conductive adhesive; 5. Solder ribbon; 6. Busbar. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0030] Please see Figures 1-3 This embodiment provides a novel gridless photovoltaic module, including a solar cell 1. The surface of the solar cell 1 is arranged with multiple fine grids 2 for current collection. The fine grids 2 of the solar cell 1 are laid out in a lotus root shape. By setting the fine grids 2 in a lotus root shape, the consumption of solder ribbons 5 is reduced, and the amount of solder ribbons 5 on a single solar cell 1 can be reduced by more than 7%. It also includes a thin film 3, which is laid on the surface of the fine grids 2. The surface of the thin film 3 is decorated with multiple UV conductive adhesives 4. It also includes multiple solder ribbons 5, which are disposed on the thin film 3 and in contact with the UV conductive adhesives 4. By setting the lotus root-shaped fine grids 2, the contact area with the solder ribbons 5 is increased. Then, by decorating the thin film 3 with UV conductive adhesives 4, the connection between the solder ribbons 5 and the solar cell 1 is enhanced. Furthermore, the connection of the solder ribbons 5 is precisely positioned, ensuring stable welding between the solder ribbons 5 and the solar cell 1, facilitating the fabrication of the photovoltaic module. Moreover, by designing a gridless solar cell string, the consumption of solder ribbons 5 can be reduced, while conductivity and connection performance are improved.

[0031] In a further embodiment of this utility model, two busbars 6 are also included, which are electrically connected to a plurality of welding strips 5 located on the same side.

[0032] In the embodiments provided by this utility model, the solder ribbon 5 and the UV conductive adhesive 4 are hot-pressed together, so that the UV adhesive dots on the film 3 melt and form an integral part with the solder ribbon 5. The solder ribbon 5 is then overlapped on the battery cell 1 and the film 3 using a hot-pressing device, while providing a certain temperature, so that the UV adhesive dots on the film 3 melt and form an integral part with the solder ribbon 5. Finally, it is cooled and solidified, and the solder ribbon 5 and the UV conductive adhesive 4 are tightly bonded together, which plays a role in precise positioning.

[0033] In a further embodiment of this invention, multiple battery cells 1 are connected in series using a stringing machine.

[0034] In this invention, a plurality of UV conductive adhesives 4 are uniformly distributed on the surface of the film 3, and the plurality of UV conductive adhesives 4 are respectively disposed at the intersection of two adjacent lotus root-shaped fine grids 2.

[0035] In this invention, multiple welding strips 5 on the side of two adjacent battery cells 1 that are close to each other are welded together.

[0036] Working principle: First, lotus root-shaped fine grids 2 are laid flat on the battery cell 1. Then, thin film 3 is laid on the surface of fine grids 2, so that UV conductive adhesive 4 is set with the intersection of two lotus root-shaped fine grids 2. Then, solder ribbon 5 is laid on UV conductive adhesive 4 of thin film 3. Then, UV conductive adhesive 4 is melted and solder ribbon 5 is bonded by hot press. The solder ribbon 5 is positioned to complete the preparation of battery cell 1.

[0037] Multiple battery cells 1 are placed side by side, and then multiple solder strips 5 on adjacent sides of two battery cells 1 are welded together. After series connection, multiple solder strips 5 on the side to be used are electrically connected to busbar 6.

[0038] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A novel gridless photovoltaic module, comprising solar cells (1), characterized in that: The surface of the battery cell (1) is provided with a plurality of fine grids (2) for current collection, and the fine grids (2) are laid out in a lotus root shape; It also includes a thin film (3), which is laid on the surface of the fine grid (2), and the surface of the thin film (3) is dotted with multiple UV conductive adhesives (4). It also includes multiple solder strips (5) disposed on the film (3) and in contact with the UV conductive adhesive (4).

2. The novel gridless photovoltaic module according to claim 1, characterized in that, It also includes two busbars (6), which are electrically connected to a plurality of solder strips (5) located on the same side.

3. A novel gridless photovoltaic module according to claim 1, characterized in that, The solder ribbon (5) and the UV conductive adhesive (4) are hot-pressed together, so that the UV adhesive dots on the film (3) melt and form an integral part with the solder ribbon (5).

4. A novel gridless photovoltaic module according to claim 1, characterized in that, Multiple solar cells (1) are connected in series by a stringing machine.

5. A novel gridless photovoltaic module according to claim 1, characterized in that, Multiple UV conductive adhesives (4) are uniformly distributed on the surface of the film (3), and multiple UV conductive adhesives (4) are respectively disposed at the intersection of two adjacent lotus root-shaped fine grids (2).

6. A novel gridless photovoltaic module according to claim 1, characterized in that, Two adjacent battery cells (1) are welded together by multiple solder strips (5) on the side that are close to each other.

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