Main-grid-free battery assembly and main-grid-free photovoltaic device
By using a conductive gel layer connected to a solder ribbon in a gridless solar cell, the problems of microcracks and low conductivity in the solar cell were solved, thus achieving protection of the solar cell and improvement of power generation efficiency.
Patent Information
- Application Number
- CN202520143457.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-01-21
AI Technical Summary
Existing gridless solar cells suffer from problems such as microcracks in the cells and low conductivity.
A conductive gel layer is used to coat the solder ribbon. The conductive gel layer is connected to the battery cell to form a conductive area and a forming area for electrical connection between the battery cell and the solder ribbon. An adhesive film is laid on the surface for insulation to prevent the battery cell from cracking or breaking during the lamination process, while improving conductivity.
It effectively protects the solar cells, preventing cracks and breakage, and improves conductivity, thereby increasing power generation and output.
Smart Images
Figure CN223899579U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of photovoltaic technology, and more specifically, to a gridless battery module and a gridless photovoltaic device. Background Technology
[0002] Gridless technology is a new type of photovoltaic cell design that eliminates the traditional grid structure and instead uses a denser, finer grid line layout. These grid lines are directly connected to the back of adjacent cells without the need for solder ribbons.
[0003] Existing gridless solar cells suffer from problems such as microcracks in the cells and low conductivity. Utility Model Content
[0004] The purpose of this invention is to provide a grid-free solar cell module and a grid-free photovoltaic device, which can avoid microcracks in the solar cells and improve conductivity, thereby increasing its own power generation and thus increasing the amount of electricity generated.
[0005] The embodiments of this utility model can be implemented as follows:
[0006] In a first aspect, this utility model provides a gridless battery module, which includes battery cells, a conductive gel layer and at least one solder strip.
[0007] A conductive gel layer is coated on the solder ribbon and connected to the solar cell, so that the solar cell is electrically connected to the solder ribbon through the conductive gel layer.
[0008] In an optional embodiment, the conductive gel layer includes a molding region and a conductive region, with the molding region covering the conductive region; the molding region covers the solder ribbon and is connected to the battery cell; the battery cell and the solder ribbon are electrically connected through the conductive region.
[0009] In an optional embodiment, the gridless battery assembly further includes a film deposited on the surface of the conductive gel layer.
[0010] In an alternative embodiment, the projection of the solder strip along the first direction lies within the outline of the solar cell.
[0011] In an optional embodiment, there are multiple solder strips, which are spaced apart along the second direction; each solder strip is connected to the conductive gel layer and the battery cell, and is electrically connected to the battery cell through the conductive gel layer.
[0012] In an optional embodiment, the cross-section of the solder strip in the first direction is circular or triangular.
[0013] In an optional embodiment, the thickness of the conductive gel layer is H, wherein 10 μm ≤ H ≤ 200 μm.
[0014] In an optional embodiment, the transmittance of the conductive gel layer is greater than or equal to 85%.
[0015] Secondly, this utility model provides a gridless photovoltaic device, which includes a laminate and the aforementioned gridless battery module, wherein the laminate abuts against the conductive gel layer.
[0016] In an optional implementation, there are multiple grid-less battery modules arranged in an array; the solder strips of each grid-less battery module abut against the laminate.
[0017] The beneficial effects of the gridless battery module and gridless photovoltaic device provided by this utility model embodiment include:
[0018] The gridless battery module includes a battery cell, a conductive gel layer, and at least one solder strip; the conductive gel layer covers the solder strip and is connected to the battery cell so that the battery cell is electrically connected to the solder strip through the conductive gel layer.
[0019] This gridless solar module connects the solar cells and solder ribbons with a conductive gel layer, which protects the solar cells and prevents them from cracking or breaking due to pressure during lamination. It also improves conductivity, thereby increasing its power generation and output. Attached Figure Description
[0020] 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.
[0021] Figure 1 This is a schematic diagram of the structure of the gridless battery module provided in this embodiment;
[0022] Figure 2 Schematic diagram of a gridless battery module provided for other embodiments;
[0023] Figure 3 This is an exploded view of the gridless photovoltaic device provided in this embodiment.
[0024] Icons: 100 - Busbar-less solar module; 110 - Solar cell; 120 - Conductive gel layer; 121 - Molding area; 122 - Conductive area; 130 - Solder ribbon; 140 - Encapsulant film; 200 - Busbar-less photovoltaic device; 210 - Laminate. Detailed Implementation
[0025] 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.
[0026] 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.
[0027] 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.
[0028] 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.
[0029] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0030] 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.
[0031] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the gridless battery assembly 100 provided in this embodiment; wherein, the X direction is the first direction, the Y direction is the second direction, and the first direction and the second direction are perpendicular.
[0032] This utility model provides a gridless battery module 100, which includes a battery cell 110, a conductive gel layer 120 and at least one solder ribbon 130. The conductive gel layer 120 covers the solder ribbon 130 and is connected to the battery cell 110 so that the battery cell 110 is electrically connected to the solder ribbon 130 through the conductive gel layer 120.
[0033] Specifically, during the installation process, the welding tape 130 can be connected to the battery cell 110 using high-temperature tape first, and then adhesive can be applied. After the adhesive gradually solidifies to form a conductive gel layer 120, the high-temperature tape can be removed.
[0034] During the lamination process, pressure is first transferred to the conductive gel layer 120. The conductive gel layer 120 acts as a buffer, thereby preventing the pressure transmitted to the battery cell 110 from being reduced due to excessive pressure, which could lead to cracks or even breakage of the battery cell 110, thus improving the protection of the battery cell 110. Furthermore, in this embodiment, the conductive gel layer 120 connects the battery cell 110 and the solder ribbon 130 together, eliminating the need for additional components to fix and connect the battery cell 110 and the solder ribbon 130, simplifying the structure and making installation more convenient.
[0035] It should be noted that when configuring the conductive gel layer 120, various conductive materials such as metals, graphene, and carbon nanotubes can be added to the conductive gel layer 120, so that the battery cell 110 and the solder ribbon 130 can be electrically connected through the conductive gel layer 120.
[0036] When adding various conductive materials such as metals, graphene, and carbon nanotubes to the conductive gel layer 120, the appropriate materials can be selected based on the actual situation. For example, the conductive material can be a mixture of metal and graphene, a mixture of metal and carbon nanotubes, or a mixture of metal, graphene, and carbon nanotubes. The mixing ratio can also be adjusted according to the actual situation. Adjusting the mixing ratio of different materials can adjust the resistivity of the conductive gel layer 120 to meet the application requirements.
[0037] In addition, when adding the aforementioned conductive materials, the particle size can be adjusted according to the usage requirements when the aforementioned conductive materials such as metals, graphene, and carbon nanotubes are in powder form; and when the aforementioned conductive materials such as metals, graphene, and carbon nanotubes are in block, sheet, or filament form, their size can be adjusted according to the usage requirements.
[0038] Based on the above, the conductive gel layer in this embodiment includes a molding region 121 and a conductive region 122, with the molding region 121 covering the conductive region 122; the molding region 121 covers the solder ribbon 130 and is connected to the battery cell 110; the battery cell 110 and the solder ribbon 130 are electrically connected through the conductive region 122.
[0039] Understandably, the aforementioned conductive materials, such as metals, graphene, and carbon nanotubes, are uniformly distributed in the conductive area 122, while the forming area 121 does not contain any of the aforementioned conductive materials. This arrangement also allows the forming area 121 to achieve an insulating function by selecting an insulating material as the material for the forming area 121. The forming area 121 and the conductive area 122 can be formed in a distributed manner, that is, after the conductive area 122 is formed, adhesive is applied to form the forming area 121.
[0040] It should be noted that in this embodiment, the solder ribbon 130 is wrapped with a conductive gel layer. Therefore, the conductive gel layer 120 covers the solder ribbon 130 to improve conductivity. Since the conductive region 122 is close to the solder ribbon 130, the forming region 121 needs to isolate the conductive region 122. Therefore, the forming region 121 covers the conductive region 122 to improve insulation. In conjunction with the foregoing, the forming region 121 of the conductive gel layer 120 covers the solder ribbon 130.
[0041] Based on the above, in this embodiment, the projection of the solder ribbon 130 along the first direction lies within the outline of the solar cell 110. Understandably, the area of the solder ribbon 130 is smaller than the area of the solar cell 110 to avoid the solder ribbon 130 blocking the solar cell 110, preventing the solar cell 110 from receiving incident sunlight and thus preventing the conversion of solar energy into electrical energy.
[0042] To prevent the battery cell 110 from cracking or breaking during the lamination process, the conductive gel layer 120 needs to cover the pressure-bearing surface of the battery cell 110. In this embodiment, the pressure-bearing surface of the battery cell 110 is its light-facing surface, which is the side connected to the solder ribbon 130. Therefore, the conductive gel layer 120 needs to be able to cover both the solder ribbon 130 and the pressure-bearing surface of the battery cell 110.
[0043] It should be noted that the conductive area 122 of the conductive gel layer 120 is close to the solder ribbon 130. Therefore, if the solder ribbon 130 is located in the middle of the battery cell 110, the conductive area 122 is located in the middle of the conductive gel layer 120; if the solder ribbon 130 is located at the edge of the battery cell 110, the conductive cloth is located at the edge of the conductive gel layer 120.
[0044] Further, please refer to Figure 1 In this embodiment, the gridless battery assembly 100 further includes an adhesive film 140, which is laid on the surface of the conductive gel layer 120. Understandably, since the conductive gel layer 120 is conductive, to prevent safety accidents from occurring after the conductive gel layer 120 comes into contact with external conductive objects, the adhesive film 140 is provided in this embodiment to serve as an insulator, preventing the conductive gel layer 120 from contacting external conductive objects or power sources, thus ensuring the safety of the gridless battery assembly 100 and preventing safety accidents.
[0045] During the installation of the adhesive film 140, the adhesive film 140 must first be placed on the surface of the conductive gel layer 120, and then cured at high temperature to connect the conductive gel layer 120 and the adhesive film 140 together.
[0046] Based on the above, in this embodiment, there are multiple solder strips 130, which are spaced apart along the second direction; each solder strip 130 is connected to the conductive gel layer 120 and the battery cell 110, and is electrically connected to the battery cell 110 through the conductive gel layer 120.
[0047] Specifically, multiple solder ribbons 130 are spaced apart along the second direction to avoid blocking the light-facing surface of the solar cell 110, ensuring that the solar cell 110 can receive incident sunlight and thus convert solar energy into electrical energy. Furthermore, in this embodiment, there are multiple conductive regions 122, each corresponding to one or more solder ribbons 130, so that the solder ribbons 130 can be electrically connected to the solar cell 110, thereby improving conductivity and ultimately increasing the power generation and output of the gridless solar module 100.
[0048] It should be noted that, please refer to Figure 1 In this embodiment, the cross-section of the solder strip 130 in the first direction is circular. Please refer to... Figure 2 , Figure 2 The diagram illustrates the structure of a gridless battery module 100 provided for other embodiments. In other embodiments, the cross-section of the solder strip 130 in the first direction may also be triangular. In other embodiments, the cross-section of the solder strip 130 in the first direction may also be semi-circular or elliptical, etc., and different shapes of solder strip 130 can be selected according to actual conditions.
[0049] Further, please refer to Figure 1 In this embodiment, the thickness of the conductive gel layer 120 is H, where 10μm ≤ H ≤ 200μm. Understandably, if the thickness of the conductive gel layer 120 is too small, it will result in poor protection of the battery cell 110, leading to excessive pressure on the battery cell 110 during lamination, potentially causing cracks or even breakage. If the thickness of the conductive gel layer 120 is too large, it will require greater pressure to achieve the lamination process, making lamination inconvenient. Furthermore, the increased thickness of the conductive gel layer 120 will increase its resistance, affecting conductivity and reducing the power generation and output of the gridless battery module 100.
[0050] Based on the above, the light transmittance of the conductive gel layer 120 in this embodiment is greater than or equal to 85%. Understandably, in this embodiment, the light-facing side of the battery cell 110 is the side where the solder ribbon 130 is located. However, since the solder ribbon 130 is provided, and the conductive gel layer 120 contains the aforementioned metals, graphene, carbon nanotubes, and other conductive materials, the light transmittance of the conductive gel layer 120 needs to be adjusted by changing the content of these conductive materials. This ensures that the light-facing side can receive incident sunlight, thereby guaranteeing the power generation of the gridless battery module 100.
[0051] Please refer to Figure 1 and Figure 3 , Figure 3 This is an exploded view of the gridless photovoltaic device 200 provided in this embodiment. This embodiment also provides a gridless photovoltaic device 200, which includes a laminate 210 and a gridless battery module 100. It should be noted that in this embodiment, there are two laminates 210, located on the light-facing and back-facing sides of the battery cell 110, respectively. Furthermore, there are also two encapsulant films 140 in this embodiment, each film 140 corresponding to one laminate 210.
[0052] It should be noted that in this embodiment, adhesive can be applied using either direct spraying or wetting methods. When applying adhesive using direct spraying, the solidified conductive gel layer 120 is located on the light-facing side of the solar cell 110. Therefore, one adhesive film 140 is laid on the surface of the conductive gel layer 120, and another adhesive film 140 is laid on the backside of the solar cell 110. When applying adhesive using the wetting method, the solidified conductive gel layer 120 will wrap around the solar cell 110. Therefore, both adhesive films 140 are laid on the surface of the conductive gel layer 120.
[0053] Understandably, in order to increase the power generation of the gridless photovoltaic device 200 so that it can power a house, it is necessary to install multiple arrays of gridless battery modules 100 to improve power generation efficiency and power generation.
[0054] The installation steps of the gridless photovoltaic device 200 provided in this embodiment are as follows:
[0055] First, the solder ribbon 130 is fixed to the battery cell 110 using high-temperature adhesive tape. Then, adhesive containing various conductive materials such as metals, graphene, and carbon nanotubes is applied to the connection surface between the battery cell 110 and the solder ribbon 130, as well as around the solder ribbon 130, using direct spraying and wetting methods. After the adhesive solidifies, a conductive gel layer 120 is formed. Finally, an adhesive film 140 is laid on the surface of the conductive gel layer 120, and high-temperature curing is used to connect the adhesive film 140 and the conductive gel layer 120 together, thereby completing the installation of the gridless battery module 100.
[0056] Multiple gridless solar cell modules 100 are arranged in an array, and the gridless solar cell modules 100 are laminated using a laminator 210 to form a gridless photovoltaic device 200.
[0057] In summary, the gridless solar module 100 includes solar cells 110, a conductive gel layer 120, and at least one solder ribbon 130. Both the solar cells 110 and the solder ribbon 130 are connected to the conductive gel layer 120, and are electrically connected through the conductive gel layer 120. By connecting the conductive gel layer 120 to the solar cells 110 and the solder ribbon 130, the gridless solar module 100 protects the solar cells 110, preventing them from cracking or even breaking under pressure during lamination. Furthermore, it improves conductivity, thereby increasing its power generation and output.
[0058] 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 battery module, characterized in that: The gridless battery module (100) includes battery cells (110), a conductive gel layer (120), and at least one solder strip (130); The conductive gel layer (120) covers the solder ribbon (130) and is connected to the battery cell (110) so that the battery cell (110) is electrically connected to the solder ribbon (130) through the conductive gel layer (120).
2. The gridless battery module according to claim 1, characterized in that: The conductive gel layer (120) includes a molding region (121) and a conductive region (122), wherein the molding region (121) covers the conductive region (122); the molding region (121) covers the solder ribbon (130) and is connected to the battery cell (110); the battery cell (110) and the solder ribbon (130) are electrically connected through the conductive region (122).
3. The gridless battery module according to claim 1, characterized in that: The gridless battery assembly (100) also includes an adhesive film (140) which is laid on the surface of the conductive gel layer (120).
4. The gridless battery module according to claim 1, characterized in that: The projection of the solder strip (130) along the first direction lies within the outline of the battery cell (110).
5. The gridless battery module according to claim 1, characterized in that: The number of the solder strips (130) is multiple, and the multiple solder strips (130) are spaced apart along the second direction; each solder strip (130) is connected to the conductive gel layer (120) and the battery cell (110), and is electrically connected to the battery cell (110) through the conductive gel layer (120).
6. The gridless battery module according to claim 1, characterized in that: The cross-section of the welding strip (130) in the first direction is circular or triangular.
7. The gridless battery module according to claim 1, characterized in that: The thickness of the conductive gel layer (120) is H, wherein 10μm≤H≤200μm.
8. The gridless battery module according to claim 1, characterized in that: The light transmittance of the conductive gel layer (120) is greater than or equal to 85%.
9. A gridless photovoltaic device, characterized in that: The gridless photovoltaic device (200) includes a laminate (210) and a gridless cell assembly (100) as described in any one of claims 1-8, wherein the laminate (210) abuts against the conductive gel layer (120).
10. The gridless photovoltaic device according to claim 9, characterized in that: The number of the gridless battery modules (100) is multiple, and the multiple gridless battery modules (100) are arranged in an array; the solder strip (130) of each gridless battery module (100) abuts against the laminate (210).